Non-contact power transmission device, non-contact power receiving device, and non-contact power transfer system
Abstract
Problem to be solved.To inspect whether a transmission amount and a power reception amount are normal values in a non-contact power transmission device which transmits power in a non-contact manner using a magnetic resonance phenomenon, and to give a device receiving power transmission the right to receive power transmission. It is desired to perform non-contact data communication at the same time as non-contact power transmission without increasing the circuit scale and cost of the device in order to certify whether or not the device has it.
Solution.A transmission coil and a power receiving coil used for non-contact power transmission using a magnetic resonance phenomenon at a predetermined magnetic resonance frequency are used as a helical antenna, and a signal having a constant multiple of the signal of the magnetic resonance frequency is used as a carrier. , Non-contact power transmission and non-contact data communication can be performed simultaneously with the same coil. [Selection diagram] Fig. 1
Term
2.2 yearsto projected expiry
Projected expiry 9 December 2028, counted from filing; an application has no term until it is granted.
- Priority and filed
- Published
- Today
- Projected expiry
7 claims: 3 independent, 4 dependent
- 1所定の磁気共鳴周波数での磁気共鳴を用いて電力を非接触で送信し、前記電力の送信とともに変調信号とされたデータを非接触で送受信する非接触電力送信装置であって、 周波数が前記所定の磁気共鳴周波数である前記電力を搬送する第1の搬送信号と、周波数が前記第1の搬送信号の定数倍である第2の搬送信号とを発生する信号発生部と、 前記第2の搬送信号を搬送波として、該搬送波を送信するデータにより変調して第1の変調信号を生成し、また受信した第2の変調信号からデータを復調する変復調部と、 前記第1の搬送信号と前記変復調部の生成した前記第1の変調信号を送信し、前記第2の変調信号を受信して前記変復調部に供給する送電コイルと を有したことを特徴とする非接触電力送信装置。
- 2請求項1に記載の非接触電力送信装置において、前記送電コイルは前記第1の搬送信号により磁気共鳴を用いて電力を送信するとともに、前記第1の変調信号を送信し、前記第2の変調信号を受信するヘリカルアンテナであることを特徴とする非接触電力送信装置。
- 3所定の磁気共鳴周波数での磁気共鳴を用いて送信された電力を非接触で受信し、前記電力の受信とともに、周波数が前記磁気共鳴周波数の定数倍である搬送波をデータにより変調した変調信号を非接触で送受信する非接触電力受信装置であって、 前記送信された電力を受信し、前記変調信号を送受信する受電コイルと、 該受電コイルで受信した電力を消費する負荷部と、 周波数が前記搬送波の周波数である第3の搬送信号を発生する信号発生部と、 前記受電コイルで受信した第3の変調信号を前記信号発生部で発生された第3の搬送信号を用いて復調し、また前記第3の搬送信号を搬送波として該搬送波を送信するデータにより変調して第4の変調信号を生成し前記受電コイルに供給する変復調部と を有することを特徴とする非接触電力受信装置。
- 4請求項3に記載の非接触電力受信装置において、前記受電コイルは前記磁気共鳴を用いて電力を受信するとともに、前記第3の変調信号を受信し、前記第4の変調信号を送信するヘリカルアンテナであることを特徴とする非接触電力受信装置。
- 5所定の磁気共鳴周波数での磁気共鳴を用いて電力を非接触で伝送し、前記電力の伝送とともに変調信号とされたデータを非接触で伝送する、非接触電力送信装置と非接触電力受信装置とを含む非接触電力伝送システムであって、 前記非接触電力送信装置は、 周波数が前記所定の磁気共鳴周波数であり前記電力を搬送する第1の搬送信号と、周波数が前記第1の搬送信号の定数倍である第2の搬送信号とを発生する信号発生部と、 前記第2の搬送信号を搬送波として、該搬送波を送信するデータにより変調して第1の変調信号を生成し、また受信された第2の変調信号からデータを復調する変復調部と、 前記第1の搬送信号と前記変復調部の生成した前記第1の変調信号を送信し、前記第2の変調信号を受信して前記変復調部に供給する送電コイルとを有し、 前記非接触電力受信装置は、 前記第1の搬送信号による電力を受信し、前記変調信号を送受信する受電コイルと、 該受電コイルで受信した電力を消費する負荷部と、 周波数が前記第2の搬送信号の周波数である第3の搬送信号を発生する信号発生部と、 前記受電コイルで受信した第1の変調信号を前記信号発生部で発生された第3の搬送信号を用いて復調し、また前記第3の搬送信号を搬送波として該搬送波を送信するデータにより変調して前記第2の変調信号を生成し前記受電コイルに供給する変復調部と を有することを特徴とする非接触電力伝送システム。
- 6請求項5に記載の非接触電力伝送システムにおいて、前記送電コイルは前記第1の搬送信号により磁気共鳴を用いて電力を送信するとともに、前記第1の変調信号を送信し、前記第2の変調信号を受信するヘリカルアンテナであり、前記受電コイルは磁気共鳴を用いて前記電力を受信するとともに、前記第1の変調信号を受信し、前記第2の変調信号を送信するヘリカルアンテナであることを特徴とする非接触電力伝送システム。
- 7請求項5に記載の非接触電力伝送システムにおいて、前記非接触電力受信装置は、リモートコントローラ、テレビジョン、ビデオカメラ、ビデオレコーダ、携帯端末機器のうちの少なくも一つであることを特徴とする非接触電力伝送システム。
Independent claims7
129 paragraphs, as filed
The present invention relates to a non-contact power transmitting device, a non-contact power receiving device and a non-contact power transmission system, and particularly relates to a non-contact power transmitting device, a non-contact power receiving device and a non-contact power transmission system utilizing a magnetic resonance phenomenon. is there.
At present, as shown in Patent Document 1, non-contact power transmission technology is actively used in non-contact IC cards and slave units of stationary telephones. Since electromagnetic induction is used for these non-contact power transmissions, the power transmitted and the power received are AC signals. Therefore, in order to perform efficient power transmission, it is important that the resonance frequency on the power transmission side and the resonance frequency on the power reception side match. In Patent Document 2, the voltage level in the receiving coil is detected, and the resonance state of the transmitting coil and the receiving coil is controlled so that the detected voltage level always takes the maximum value.
However, in non-contact power transmission using electromagnetic induction, the power transmission distance is limited to the range of several mm to several cm, so it is unlikely that power will be transmitted to multiple power receiving sides at the same time. Not done.
While the above technology performs non-contact power transmission by electromagnetic induction, a technology for performing non-contact power transmission using a magnetic resonance phenomenon as in Non-Patent Document 1 has been demonstrated. In non-contact power transmission using the magnetic resonance phenomenon, power transmission is possible even if the distance between the power receiving side and the power transmitting side is several meters.
Since the non-contact power transmission device using the magnetic resonance phenomenon can transmit power at a distance of several tens of centimeters to several meters, it has a reception resonance system having the same characteristics as the power receiving side, which is the target of non-contact power transmission. By intentionally using another power receiving side, it is possible to illegally receive power. Further, in the magnetic resonance phenomenon, when an object having a resonance characteristic equivalent to that of the receiving coil is nearby, the object receives electric power and the object is overheated, or the object receives electric power. Therefore, there is a possibility that abnormal power transmission may occur, such as the amount of power that can be received by the receiving coil becomes smaller than the amount of power that should be originally received. In Patent Document 3, a data communication system for non-contact communication of data is implemented separately from a system for transmitting power between a power transmitting side and a power receiving side, and a power receiving system currently receiving power is provided. The data for confirming whether is a receiving system that is permitted to receive power normally, or the amount of power currently being received by the regular power receiving system is transmitted by the power transmitting system. It communicates data to confirm that it is not extremely attenuated compared to electric power.
<patcit num="1"><text>Japanese Unexamined Patent Publication No. 8-340285</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 11-188113</text></patcit><patcit num="3"><text>JP-A-2007-231567</text></patcit><nplcit num="1"><text>Andre Kurs, et al. Wireless Power Transfer via Strongly Coupled Magnetic Resonances, SCIENCE, VOL 317, pp.83-85, 6 JULY 2007</text></nplcit>
<p> However, if a data communication system different from the system for transmitting power is mounted between the power transmitting side and the power receiving side, the circuit scale increases, and the manufacturing cost increases and the size of the equipment increases accordingly. There is a problem that it becomes huge.</p><p> In order to solve such a problem, the present invention provides a small non-contact power transmitting device, a non-contact power receiving device, and a non-contact power capable of simultaneously performing non-contact power transmission and non-contact data communication. The purpose is to provide a transmission system.</p>
<p> In order to achieve the above object, the present invention uses magnetic resonance at a predetermined magnetic resonance frequency to transmit power in a non-contact manner, and together with the transmission of the power, a non-contact power that transmits and receives data as a modulated signal in a non-contact manner. A transmitting device that generates a first transport signal whose frequency is the predetermined magnetic resonance frequency and transports the power, and a second transport signal whose frequency is a constant multiple of the first transport signal. A signal generation unit and a modulation / demodulation unit that uses the second carrier signal as a carrier and modulates it with data that transmits the carrier to generate a first modulated signal, and also demolishes data from the received second modulated signal. It is characterized by having a transmission coil that transmits the first carrier signal and the first modulation signal generated by the modulation / demodulation unit, receives the second modulation signal, and supplies the modulation / demodulation unit to the modulation / demodulation unit. There is.</p><p> Further, the present invention receives the power transmitted by magnetic resonance at a predetermined magnetic resonance frequency in a non-contact manner, and at the same time as receiving the power, a carrier wave whose frequency is a constant multiple of the magnetic resonance frequency is modulated by data. A non-contact power receiving device that transmits and receives a modulated signal in a non-contact manner, the power receiving coil that receives the transmitted power and transmits and receives the modulated signal, and a load unit that consumes the power received by the power receiving coil. A signal generator that generates a third carrier signal whose frequency is the frequency of the carrier wave and a third modulated signal received by the power receiving coil are demodulated using the third carrier signal generated by the signal generator. Further, it is characterized by having a modulation / demodulation unit that generates a fourth modulated signal by modulating the third carrier signal as a carrier wave with data for transmitting the carrier wave and supplies the fourth modulated signal to the power receiving coil.</p><p> Further, the present invention is non-contact with a non-contact power transmission device that transmits power in a non-contact manner using magnetic resonance at a predetermined magnetic resonance frequency, and transmits the data as a modulated signal in a non-contact manner together with the transmission of the power. A non-contact power transmission system including a power receiving device, wherein the non-contact power transmitting device has a first carrier signal having a frequency of the predetermined magnetic resonance frequency and carrying the power, and a frequency of the first. A signal generator that generates a second carrier signal that is a constant multiple of the carrier signal of the above, and the second carrier signal as a carrier are modulated by data that transmits the carrier to generate a first modulated signal. Also, a modulation / demodulation unit that demolishes data from the received second modulation signal, the first carrier signal, and the first modulation signal generated by the modulation / demodulation unit are transmitted, and the second modulation signal is received. The non-contact power receiving device has a power transmitting coil that supplies power to the modulation / demodulation unit, and the non-contact power receiving device receives power from the first carrier signal, receives the modulation signal, and receives the power receiving coil. A load unit that consumes the generated power, a signal generation unit that generates a third transport signal whose frequency is the frequency of the second transport signal, and a signal generation unit that generates a first modulated signal received by the power receiving coil. It is demodulated using the third carrier signal generated in the above, and the third carrier signal is modulated by the data transmitted from the carrier as a carrier to generate the second modulated signal and supply it to the power receiving coil. It is characterized by having a modulation / demodulation unit.</p>
<p> According to the present invention, a small non-contact power transmitting device, a non-contact power receiving device, and a non-contact power capable of simultaneously performing non-contact power transmission and ear contact data communication by using a magnetic resonance phenomenon at a predetermined magnetic resonance frequency. It has the effect of realizing a transmission system.</p>
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a first embodiment of the non-contact power transmission device according to the present invention. The non-contact power transmission device of this embodiment has at least one power transmission unit that transmits power in a non-contact manner using a magnetic resonance phenomenon at a predetermined magnetic resonance frequency, and a magnetic resonance phenomenon at a predetermined magnetic resonance frequency. It includes at least one power receiving unit that receives power in a non-contact manner, and the power transmitting unit has a frequency of a signal having a predetermined magnetic resonance frequency and a frequency that is a constant multiple of the signal having the predetermined magnetic resonance frequency. Power can be transmitted using at least one signal generator capable of outputting signals individually and a magnetic resonance phenomenon at the predetermined magnetic resonance frequency, and at the same time, a signal having the predetermined magnetic resonance frequency. A power transmission coil that is a helical antenna capable of transmitting and receiving data using a signal having a frequency that is a constant multiple of the frequency of the above, a reception signal received by the power transmission coil, and the predetermined magnetic resonance frequency output from the signal generation unit. A signal having a frequency that is a constant multiple of that of the signal is input, and the received signal can be demolished, or the transmission data transmitted from the power transmission coil is output from the signal generator. It is provided with at least one modulation / demodulation unit that can be modulated using a signal having a frequency that is a constant multiple of that of the above and output to the power transmission coil.
Further, the power receiving unit uses at least one signal generating unit capable of outputting a signal having a frequency that is a constant multiple of a signal having a predetermined magnetic resonance frequency, and a magnetic resonance phenomenon at a predetermined magnetic resonance frequency. A power receiving coil which is a helical antenna capable of receiving and transmitting data using a signal having a frequency that is a constant multiple of the signal of the predetermined magnetic resonance frequency as a carrier, and the power received by the power receiving coil. A signal having a frequency that is a constant multiple of the received signal received by the power receiving coil and the signal of the predetermined magnetic resonance frequency output from the signal generating unit is input to the load unit that consumes the above signal, and the received signal is demolished. The transmission data that can be generated or transmitted from the power receiving coil is modulated using a signal having a frequency that is a constant multiple of the signal of the predetermined magnetic resonance frequency output from the signal generating unit and output to the power receiving coil. It is equipped with at least one modulation / demodulation unit that can be used.
Hereinafter, the operation of the embodiment shown in FIG. 1 will be described in detail. Here, as described above, the power transmission unit 14 that transmits power using the magnetic resonance phenomenon at a predetermined magnetic resonance frequency and the power reception unit that receives power using the magnetic resonance phenomenon at the predetermined magnetic resonance frequency. It has a part 15.
First, the operation of the power transmission unit 14 will be described in detail. The signal generation unit 1 outputs a signal having a predetermined magnetic resonance frequency from the resonance signal output terminal 10, and outputs a signal having a frequency that is a constant multiple of the predetermined magnetic resonance frequency from the constant multiple signal output terminal 11. The resonance signal output from the resonance signal output terminal 10 is input from the transmission coil input / output terminal 3 to the transmission coil 4 which is a helical antenna, and the constant multiple signal output from the constant multiple signal output terminal 11 is a constant multiple signal input. It is input from terminal 12 to the modulation / demodulation unit 13.
The transmission coil 4 which is a helical antenna transmits the transmission power 8 to the power receiving coil 9 which is the helical antenna of the power receiving unit 15 by using the magnetic resonance phenomenon by the input resonance signal. The modulation / demodulation unit 13 to which the constant multiple signal is input from the constant multiple signal input terminal 12 modulates the data to be transmitted to the power receiving unit 15 using the constant multiple signal as a carrier wave, and outputs the data to be output from the transmission / reception signal input / output terminal 2. The transmission signal output from the transmission / reception signal input / output terminal 2 is input from the transmission coil input / output terminal 3 to the transmission coil 4 which is a helical antenna.
The transmission coil 4 which is a helical antenna transmits the transmission signal input from the transmission coil input / output terminal 3 as a radio wave 5 to the power receiving coil 9 which is a helical antenna of the power receiving unit 15. Further, the power transmission coil 4 which is a helical antenna can receive the radio wave 5 from the power reception coil 9 which is the helical antenna of the power receiving unit 15, and outputs the received signal from the power transmission coil input / output terminal 3.
The received signal output from the power transmission coil input / output terminal 3 is input to the modulation / demodulation unit 13 from the transmission / reception signal input / output terminal 2. The modulation / demodulation unit 13 to which the received signal is input from the transmission / reception signal input / output terminal 2 demodulates the received signal using the constant multiple signal input from the constant multiple signal input terminal 12.
Next, the operation of the power receiving unit 15 will be described in detail. The power receiving coil 9 which is a helical antenna receives the transmission power 8 and the radio wave 5 transmitted by the magnetic resonance phenomenon from the transmission coil 4 which is the helical antenna of the power transmission unit 14, and receives the received power and the received signal. Is output from the power receiving coil input / output terminal 6. The power output from the power receiving coil input / output terminal 6 is input to the load unit 7, and the load unit 7 consumes the input power. The received signal output from the power receiving coil input / output terminal 6 is input to the modulation / demodulation unit from the transmission / reception signal input / output terminal 17.
The signal generation unit 20 outputs a signal having a frequency that is a constant multiple of a predetermined magnetic resonance frequency from the constant multiple signal output terminal 19. The constant multiple signal output from the constant multiple signal output terminal 19 is input to the modulation / demodulation unit 16 from the constant multiple signal input terminal 18.
The modulation / demodulation unit 16 demodulates the received signal input from the transmission / reception signal input / output terminal 17 using the constant multiple signal input from the constant multiple signal input terminal 18. Further, the modulation / demodulation unit 16 can modulate the data to be transmitted to the power transmission unit 14 using the constant multiple signal input from the constant multiple signal input terminal 18 as a carrier wave and output the data from the transmission / reception signal input / output terminal 17. The transmission signal output from the transmission / reception signal input / output terminal 17 is input from the power receiving coil input / output terminal 6 to the power receiving coil 9. The power receiving coil 9 which is a helical antenna transmits a transmission signal input from the power receiving coil input / output terminal 6 to the power transmitting coil 4 which is a helical antenna of the power transmitting unit 1 as a radio wave 5.
Here, FIG. 2 shows an example of an embodiment of the power transmission coil 4 which is a helical antenna and the power reception coil 9 which is a helical antenna, which are the features of the present invention. The same reference numerals are shown for functional blocks similar to those in FIG.
The power transmission coil 4 which is a helical antenna includes a power transmission coil input / output terminal 3, a 1-turn primary coil 21, and a secondary coil 22 which is a helical antenna. The one-turn primary coil 21 and the secondary coil 22, which is a helical antenna, have the same diameter, and are coupled and excited by electromagnetic induction.
Here, the predetermined magnetic resonance frequency is set to f.<sub>L</sub>(Hz), wavelength λ of the signal of the magnetic resonance frequency<sub>L</sub>(m), the number of turns of the secondary coil 22 is T, the total length of the secondary coil 22 is L (m), the length of one turn of the secondary coil 22 is l (m), and the speed of light is c (m / s). Then λ<sub>L</sub>= c / f<sub>L</sub> (Equation 1) Is. In addition, L is λ because power is transmitted using the magnetic resonance phenomenon.<sub>L</sub>The value should be approximately equal to / 2, but the actual resonance frequency will be slightly lower due to the parasitic capacitance between the windings of the secondary coil 22. Therefore, the total length L of the secondary coil is λ.<sub>L</sub>The value is a little shorter than / 2, but here L = λ as shown in Equation 1.<sub>L</sub>As / 2, the magnetic resonance frequency f<sub>L</sub>(Hz) and frequency f that can be transmitted by the helical antenna<sub>Z</sub>The relationship with (Hz) will be explained in an easy-to-understand manner.
The number of turns of the secondary coil 22 is T, and the total length of the secondary coil 22 is L = λ<sub>L</sub>/ 2 (m) (Equation 2) Therefore, the length l of one turn of the secondary coil 22 is l = L / T = λ<sub>L</sub>/ 2T (m) (Equation 3) Will be. Here, the secondary coil 22 is a helical antenna. The helical antenna can transmit a signal having the same wavelength as the length of one coil. That is, the wavelength of the signal that can be transmitted by the helical antenna is λ.<sub>z</sub>, Frequency f<sub>z</sub>Then λ<sub>z</sub>= l = L / T = λ<sub>L</sub>/ 2T (m) (Equation 4) f<sub>z</sub>= c / λ<sub>z</sub>= 2 × T × c / λ<sub>L</sub>= 2 × T × f<sub>L</sub>(Hz) (Equation 5) Therefore, the secondary coil 22 has a predetermined magnetic resonance frequency f.<sub>L</sub>Transmission of power to the power receiver in a non-contact manner using the magnetic resonance phenomenon at (Hz), and the predetermined magnetic resonance frequency f represented by Equation 5.<sub>L</sub>Frequency f of 2 × T times (Hz)<sub>z</sub>= 2 × T × f<sub>L</sub>Modulation data can be transmitted or received using a (Hz) signal as a carrier wave. The number of turns T of the secondary coil 22 can be freely set as long as it is a real number of 1 or more. If the number of turns T of the secondary coil 22 is set to an integer, the frequency of the signal that can be transmitted by the helical antenna is f.<sub>z</sub>= 2 × T × f<sub>L</sub>Since it is (Hz), the predetermined magnetic resonance frequency f<sub>L</sub>Harmonics with frequencies even multiples of the above can be transmitted. Similarly, if the number of turns T of the secondary coil 22 is set to a multiple of (natural number +0.5), the frequency of the signal that can be transmitted by the helical antenna is f.<sub>z</sub>= 2 × T × f<sub>L</sub>Since it is (Hz), the predetermined magnetic resonance frequency f<sub>L</sub>Harmonics with frequencies that are odd multiples of the above can be transmitted.
The power receiving coil 9 which is a helical antenna includes a power transmission coil input / output terminal 6, a one-turn primary coil 23, and a secondary coil 24 which is a helical antenna. The one-turn primary coil 23 is the same as the one-turn primary coil 21, and the secondary coil 24, which is a helical antenna, is the same as the secondary coil 22 which is the helical antenna.
Next, FIG. 3 shows an example of the embodiment of the signal generation unit 1. The same reference numerals are shown for functional blocks similar to those in FIG. The signal generator 1 includes multipliers / dividers 25a and 25b, a filter circuit 26, a filter circuit 27, an amplifier 28, an oscillator 29, a resonance signal output terminal 10, and a constant multiple signal output terminal 11. ing.
In the embodiment of FIG. 3, the oscillator 29 outputs a signal of an arbitrary frequency. The signal output from the oscillator 29 is input to the multiplier / dividers 25a and 26b, respectively. The multiplier / divider 25a outputs a signal having a predetermined magnetic resonance frequency using the input signal as a reference frequency signal. The signal output from the multiplier / divider 25a is input to the filter circuit 26. The filter circuit 26 filters and outputs only a signal having a predetermined magnetic resonance frequency from the input signals. The signal output from the filter circuit 26 is input to the amplifier 28, and the amplifier 28 amplifies the input signal and outputs it from the resonance signal output terminal 10. The multiplier / divider 25b outputs a signal having a frequency that is a constant multiple of a predetermined magnetic resonance frequency, using the input signal as a reference frequency signal. The signal output from the multiplier / divider 25b is input to the filter circuit 27. The filter circuit 27 suppresses and outputs a frequency component other than a constant multiple of a predetermined magnetic resonance frequency signal that can be transmitted by the transmission coil 4 as the helical antenna as described above from the input signal. The signal output from the filter circuit 27 is output from the constant multiple signal output terminal 11.
Next, FIG. 4 shows an example of an embodiment of the signal generation unit 20. The same reference numerals are shown for functional blocks similar to those in FIG. The signal generator 20 includes a filter circuit 39, a multiplication / frequency divider 40, an oscillator 41, and a constant multiple signal output terminal 19. In the embodiment of FIG. 4, the oscillator 41 outputs a signal of an arbitrary frequency. The signal output from the oscillator 41 is input to the multiplier / divider 40. The multiplier / frequency divider 40 outputs a signal having a frequency that is a constant multiple of a predetermined magnetic resonance frequency, using the input signal as a reference frequency signal. The signal output from the multiplier / divider 40 is input to the filter circuit 39. The filter circuit 39 filters and outputs only a signal having a frequency that is a constant multiple of a predetermined magnetic resonance frequency from the input signals. The signal output from the filter circuit 39 is output from the resonance signal output terminal 19.
Next, FIG. 5 shows an example of an embodiment of the modulation / demodulation unit 13. The same reference numerals are shown for functional blocks similar to those in FIG. The modulation / demodulation unit 13 includes a modulator 30, a switching circuit 31, a filter circuit 32, a demodulator 33, a control unit 34, a transmission / reception signal input / output terminal 2, a constant multiple signal input terminal 12, and a modulation signal input terminal. It includes 35, a demodulated signal output terminal 36, a switching circuit input / output terminal 37, and a filter circuit 38.
The constant multiple signal, which is a signal having a frequency that is a constant multiple of the signal of a predetermined magnetic resonance frequency that can be transmitted by the transmission coil 4 input from the constant multiple signal input terminal 12 as the helical antenna as described above, is the modulator 30 and Each is input to the demodulator 33. First, the operation of the modulation / demodulation unit 13 when data is transmitted from the power transmission unit 14 to the power reception unit 15 will be described in detail.
When transmitting data from the power transmission unit 14 to the power reception unit 15, the control unit 34 outputs the transmission data to the modulator 30, and the modulation signal input terminal 35 and the switching circuit input / output terminal 37 are connected to the switching circuit 31. Outputs a control signal to connect.
The modulator 30 modulates the transmission data input from the control unit using the input constant multiple signal as a carrier wave, and outputs it as a transmission signal. The transmission signal output from the modulator 30 is input to the filter circuit 32. The filter circuit 32 suppresses and outputs a frequency component other than a signal in a frequency band that is a constant multiple of a signal having a predetermined magnetic resonance frequency, which can be transmitted by the transmission coil 4 as a helical antenna as described above. To do. The transmission signal output from the filter circuit 32 is input to the switching circuit 31 from the modulation signal input terminal 35.
In the switching circuit 31, the control signal output from the control unit is input, and by connecting the modulation signal input terminal 35 and the switching circuit input / output terminal 37 according to the input control signal, the input is input from the modulation signal input terminal 35. The transmitted signal is output from the switching circuit input / output terminal 37. The transmission signal output from the switching circuit input / output terminal 37 is output from the transmission / reception signal input / output terminal 2.
Next, the operation of the modulation / demodulation unit 13 when data is transmitted from the power receiving unit 15 to the power transmitting unit 14 will be described in detail. From power receiver 15 to power transmitter 14 when transmitting the data, the control unit 34 outputs a control signal for connecting the demodulated signal output terminal 36 and the switching circuit output terminal 37 to the switching circuit 31. A reception signal is input from the transmission / reception signal input / output terminal 2, and the reception signal is input from the switching circuit input / output terminal 37 to the switching circuit 31. In the switching circuit 31, the control signal output from the control unit is input, and by connecting the demodulation signal output terminal 36 and the switching circuit input / output terminal 37 according to the input control signal, the switching circuit input / output terminal 37 The input received signal is output from the demodulated signal input terminal 36.
The received signal output from the demodulated signal input terminal 36 is input to the filter circuit 38. The filter circuit 38 suppresses and outputs a frequency component other than a signal in a frequency band that is a constant multiple of a signal having a predetermined magnetic resonance frequency, which can be transmitted by the transmission coil 4 as a helical antenna as described above. To do. The received signal output from the filter circuit 38 is input to the demodulator 33.
The demodulator 33 demodulates the received signal input from the filter circuit 38 using the input constant multiple signal as a carrier wave, and outputs the received data obtained as a result of demodulating the received signal to the control unit. The received data output from the demodulator is input to the control unit.
The modulation / demodulation unit 16 has exactly the same configuration as the modulation / demodulation 13 described above. However, the control signal output by the control unit 34 and the control signal output from the control unit 34 are input, and the operation of the switching circuit 31 based on the input control signal is different from that of the modulation / demodulation unit 13. When data is transmitted from the power transmission unit 14 to the power reception unit 15, the control unit 34 outputs a control signal for connecting the demodulation signal output terminal 36 and the switching circuit input / output terminal 37 to the switching circuit 31 to output power. When data is transmitted from the receiving unit 15 to the power transmitting unit 14, the control unit 34 outputs a control signal for connecting the modulated signal input terminal 35 and the switching circuit input / output terminal 37 to the switching circuit 31.
When the switching circuit 31 transmits data from the power transmission unit 14 to the power reception unit 15, the control signal output from the control unit 34 is input, and the demodulation signal output terminal 36 and the switching circuit 31 are based on the input control signal. When connecting the input / output terminal 37 and transmitting data from the power receiving unit 15 to the power transmitting unit 14, the modulated signal input terminal 35 and the switching circuit input / output terminal 37 are connected based on the input control signal. ..
In the configuration of the first embodiment described above, the data transmitted from the power transmitting unit 14 to the power receiving unit 15 and the data transmitted from the power receiving unit 15 to the power transmitting unit 14 both have the same frequency. It is transmitted and received as radio waves. At this time, if the power transmitting unit 14 and the power receiving unit 15 simultaneously execute data transmission, it will not be possible to accurately transmit and receive data. Therefore, in the control unit 34, accurate data transmission / reception is realized by controlling the timing of data transmission and reception so that the power transmission unit 14 and the power reception unit 15 do not execute data transmission at the same time. ..
With the configuration shown in this embodiment, a communication system for communicating arbitrary data with each other between the power transmitting side and the power receiving side is provided separately from the power transmitting system. Since there is no need, it is possible to realize a device capable of simultaneously executing non-contact power transmission and non-contact data communication in a small size and at low cost.
Conventionally, when the communication system for data communication is combined with the system for transmitting electric power, the carrier wave for transmitting electric power is modulated based on the data. In this embodiment, the data rate to be transmitted can be increased in order to perform data communication at a frequency that is a constant multiple of the carrier wave for transmitting electric power. In addition, since the carrier wave that transmits electric power generally has a large amplitude, modulation of the carrier wave requires a large-scale circuit. In this embodiment, since data communication is performed at a frequency that is a constant multiple of the carrier wave that transmits power, it is possible to perform modulation / demodulation with a signal having a small amplitude suitable for modulation / demodulation processing.
The optional data includes authentication data for certifying whether or not the device receiving power is a device having the right to receive power, or the amount of power currently transmitted is normal. It is possible to communicate data for monitoring whether or not it is. As a result of communicating the authentication data or the data for monitoring, there is a device that is receiving power even though it does not have the right to receive power. In the event of abnormal power transmission that is not the amount of power, it is possible to prevent the device transmitting power from consuming unnecessary power by immediately stopping the transmission of power by the power transmission unit 14. Become.
FIG. 6 shows an example of a flowchart of a process for immediately stopping the transmission of electric power by the electric power transmission unit 14 when the illegal power reception and the abnormal power transmission occur. In step S1, the authentication data is communicated between the device that transmits power and the device that receives power, and step S2 is executed. In step S2, the device that transmits the power determines whether or not the device that receives the power has the right to receive the power. If, as a result of the determination in step S2, it is determined that the device that receives the electric power has the right to receive the electric power (YES in the figure), step S3 is executed. On the other hand, if it is determined that the device that receives the electric power does not have the right to receive the electric power (NO in the figure), step S4 is executed.
In step S3, the device that transmits the power receives data on the amount of power currently being received by the device that receives the power from the device that receives the power, and executes step S6. In step S6, when the device that transmits the power has an extremely different amount of power that the device that transmits the power is currently transmitting and the data of the amount of power that has been received (NO in the figure). ), It is determined that abnormal power transmission has occurred, and step S4 is executed. On the other hand, if the amount of power currently transmitted by the device that transmits the power and the data of the amount of power received are not extremely different (YES in the figure), abnormal power transmission occurs. It is determined that this has not been done, and after a certain period of time has elapsed, step S3 is executed again.
In step S4, the device that transmits the electric power notifies the device that receives the electric power that the transmission of the electric power is stopped, and step S5 is executed. In step S5, the device that transmits the electric power stops the transmission of the electric power by stopping the output of the resonance signal from the resonance signal output terminal 10 shown in FIG.
By executing the processing flow shown in Fig. 6, there is a device that is receiving power even though it does not have the right to receive power. By immediately stopping the transmission of electric power by the electric power transmitting unit 14 when an abnormal power transmission or the like occurs, it is possible to prevent the device that transmits the electric power from consuming unnecessary electric power.
FIG. 7 is a block diagram showing an embodiment of the signal generation unit 1 different from the embodiment shown in FIG. 3 in the first embodiment of the non-contact power transmission device according to the present invention shown in FIG. The same reference numerals are given for functional blocks similar to those in FIGS. 1 and 3. In the embodiment of FIG. 7, the signal generation unit 1 includes an oscillator 29, a filter circuit 26, a filter circuit 27, an amplifier 28, a resonance signal output terminal 10, and a constant multiple signal output terminal 11.
The oscillator 29 outputs a signal having a predetermined magnetic resonance frequency and a harmonic signal of the signal having the predetermined magnetic resonance frequency. The signal output from the oscillator 29 is input to both the filter circuit 26 and the filter circuit 27. The filter circuit 26 suppresses and outputs frequency components other than the signal having a predetermined magnetic resonance frequency from the input signal. The signal output from the filter circuit 26 is input to the amplifier 28, and the amplifier 28 amplifies the input signal and outputs it from the resonance signal output terminal 10. The filter circuit 27 suppresses and outputs frequency components other than the harmonics of the frequency that can be transmitted as the helical antenna as described above by the transmission coil 4 from the harmonics of the input signal of the predetermined magnetic resonance frequency. The signal output from the filter circuit 27 is output from the constant multiple signal output terminal 11. Compared with the embodiment shown in FIG. 3, this embodiment does not require the multipliers / dividers 25a and 26b, so that the circuit can be further miniaturized and the price can be reduced.
FIG. 8 is a block diagram showing an embodiment of a power receiving unit different from that of the first embodiment shown in FIG. The same reference numerals are given for functional blocks similar to those in FIGS. 1 and 4. In this embodiment, unlike the power receiving unit 15 shown in the first embodiment, the power receiving unit 15b includes a load unit 7b instead of the load unit 7 and a signal generating unit 20b instead of the signal generating unit 20. ing. In the embodiment of FIG. 8, the load unit 7b includes a reference signal output terminal 42, and the signal generation unit 20b includes a filter circuit 39, a multiplication / frequency divider 40, a constant multiple signal output terminal 19, and a reference signal. It has an input terminal 43.
The load unit 7b consumes the input power in the same manner as the load unit 7, and at the same time, outputs a part of the input power signal from the reference signal output terminal 42. The signal output from the reference signal output terminal 42 is input from the reference signal input terminal 43 to the signal generation unit 20b. In the signal generator 20b, the signal input from the reference signal input terminal 43 is input to the multiplier / divider 40. The multiplier / divider 40 uses the input signal as a reference signal, outputs a signal that is a constant multiple of a predetermined magnetic resonance frequency, and inputs the signal to the filter circuit 39. The filter circuit 39 filters and outputs only a signal having a frequency that is a constant multiple of a predetermined magnetic resonance frequency from the input signals. Since the signal output from the filter circuit 39 is output from the signal output terminal 19, the signal generator 20b multiplys the signal having a frequency constant times the predetermined magnetic resonance frequency by a constant multiple like the signal generator 20. Output from signal output terminal 19. In this embodiment, as compared with the signal generator 20 used in the first embodiment shown in FIG. 4, the oscillator 41 is not required, so that the circuit can be further miniaturized and the price can be reduced.
FIG. 9 is a block diagram showing an embodiment of a power transmission unit different from that of the first embodiment shown in FIG. The same reference numerals are given for functional blocks similar to those in FIGS. 1 and 5. In this embodiment, unlike the power transmission unit 14 shown in the first embodiment, the power transmission unit 14b includes a data input / output terminal 44 and a modulation / demodulation unit 13b. In the embodiment of FIG. 9, unlike the embodiment shown in FIG. 5, the modulation / demodulation unit 13b includes a control unit 34b capable of inputting / outputting signals to / from the data input / output terminal 44 in addition to the functions of the control unit 34. ing.
The signal received by the power transmission coil 4 is demodulated by the modulation / demodulation unit 13b, and is output from the data input / output terminal 44 to the outside of the power transmission unit 14b by the control unit 34b. Further, the data input from the outside of the power transmission unit 14b to the data input / output terminal 44 is input to the control unit 34b, modulated by the modulation / demodulation unit 13b, and transmitted from the power transmission coil 4.
With the configuration shown in this embodiment, arbitrary data can be input / output to / from the power transmission unit 14b from the outside of the power transmission unit 14b using the data input / output terminal 44, and the arbitrary data can be input / output. , It becomes possible to communicate with the power receiving unit by using the power transmitting unit 14b.
FIG. 10 is a block diagram showing an embodiment of a power receiving unit different from the embodiment shown in FIG. The same reference numerals are given for functional blocks similar to those in FIGS. 1 and 5. In this embodiment, the power receiving unit 15c is different from the power receiving unit 15 shown in FIGS. 1 and 5 above, and has a data input / output terminal 46, a load unit 7c, a modulation / demodulation unit 16b, and a power output terminal 45. And have.
Unlike the embodiments shown in FIGS. 1 and 8, the load unit 7c can output a part or all of the input power from the power output terminal 45 to the outside of the power receiving unit 15c. Further, unlike the embodiment shown in FIG. 5, the modulation / demodulation unit 16b includes a control unit 34b capable of inputting / outputting signals to / from the data input / output terminal 46 in addition to the functions of the control unit 34.
The signal received by the power receiving coil 9 is demodulated by the modulation / demodulation unit 16b, and is output from the data input / output terminal 46 to the outside of the power receiving unit 15c by the control unit 34b. Further, the data input from the outside of the power receiving unit 15c to the data input / output terminal 46 is input to the control unit 34b, modulated by the modulation / demodulation unit 16b, and transmitted from the power receiving coil 9. Further, a part or all of the electric power received by the power receiving coil 9 is output from the power output terminal 45 to the outside of the power receiving unit 15c by the load unit 7c.
With the configuration shown in this embodiment, arbitrary data can be input / output to / from the power receiving unit 15c from the outside of the power receiving unit 15c using the data input / output terminal 46. The power transmitting unit 14b of FIG. 9 can communicate the arbitrary data with the power receiving unit 15c. Further, all or part of the power received by the power receiving unit 15c can be output from the power output terminal 45 to the outside of the power receiving unit 15c.
FIG. 11 shows an example in which power is transmitted to the remote controller in an audiovisual system such as a television operated by the remote controller using the electric power transmitting unit 14b and the electric power receiving unit 15c shown in the fourth embodiment. It is a block diagram. This system consists of a central station that has the function of transmitting electric power and a remote controller that has the function of receiving electric power.
The central station controls the operation of the central station, or authenticates whether or not a device receiving power transmitted by the central station has the right to receive power, or records or inputs data. It is provided with at least one control / signal processing unit that performs signal processing on the signal, a power transmission unit 14b shown in the fourth embodiment, and a signal input / output unit that inputs / outputs a data signal to the central station. ing. Further, the remote controller has an input unit in which a person using the remote controller operates the remote controller, a power receiving unit 15c shown in the fourth embodiment, and the remote controller has the right to transmit electric power by the central station. A control / signal processing unit that authenticates whether or not the remote controller operates, controls the operation of the remote controller, or performs signal processing on the input signal, and a power using unit that uses the power received by the power receiving unit 15c. , Each have at least one. A rechargeable battery may or may not be provided inside the power-using unit.
Hereinafter, the operation of the embodiment shown in FIG. 11 will be described in detail. The central station 47 transmits electric power as electric power 50 which is transmitted from the electric power transmitting unit 14b to the electric power receiving unit 15c of the remote controller 55 in a non-contact manner.
The remote controller 55 receives the non-contact power 50 transmitted from the power transmission unit 14b of the central station 47 by the power reception unit 15c, and takes out all or a part of the received power from the power output terminal 45. Input to the power usage unit 53. The power-using unit 53 uses the input power to drive the remote controller 55, or charges the rechargeable battery provided in the power-using unit 53.
Further, data communication 51 can be performed between the power transmission unit 14b of the central station 47 and the power reception unit 15c of the remote controller 55. In this embodiment, the data communication 51 is a control signal for confirming whether or not the power 50 transmitted in a non-contact manner is a normal amount of power, and the remote control 55 is a power source in a non-contact manner by the central station 47. It can be used for communication of an authentication signal for confirming authentication as to whether or not the device has the right to transmit, and an operation signal from the remote control 55.
The communication of the authentication signal will be described. If the control / signal processing unit 49 of the central station 47 inputs or outputs the authentication signal and determines that the remote controller 55 is not a device having the right to transmit power contactlessly by the central station 47, the central station 47 is central. Stop the transmission of power from the station 47 to the remote controller 55. Alternatively, if the control / signal processing unit 54 of the remote controller 55 inputs or outputs the authentication signal and determines that the remote controller 55 is not a device having the right to transmit power in a non-contact manner by the central station 47, Stops the reception of power by the remote control 55.
Communication of the remote control operation signal will be described. The input unit 52 of the remote controller 55 receives the user's remote controller operation and outputs the remote controller operation signal. The remote control operation signal output from the input unit 52 is input to the control / signal processing unit 54, subjected to signal processing, input from the data input / output terminal 46 to the power receiving unit 15c, and is input to the power receiving unit 15c as the data communication 51 at the central station 47. It is transmitted to the power transmission unit 14b of. The power transmission unit 14b of the central station 47 outputs the received remote control operation signal from the data input / output terminal 44 and inputs it to the control / signal processing unit 49. The remote control operation signal input to the control / signal processing unit 49 is used for controlling the central station 47 by the control / signal processing unit 49, or is subjected to signal processing and output to the signal input / output unit 48. The signal input / output unit 48 outputs the input remote control operation signal to the device operated by the remote control 55. The device operated by the remote controller 55 is a device connected to the central station 47 by wire or wirelessly, or a device in which power is supplied from the central station 47 in a non-contact manner like the remote controller 55.
The control signal, the authentication signal, and the remote control operation signal are superposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing, and are transmitted and received as data communication 51.
The system shown in this embodiment includes the non-contact power transmission device according to the present invention, and can perform non-contact power transmission to the remote control 55 and the data communication with the same coil, and thus is non-contact. It is not necessary to separately provide a coil for power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the remote control 55. Further, the remote controller 55 is provided with a power usage unit 53 that can be provided with a rechargeable battery inside, and since power is transmitted from the central station 47 in a non-contact manner, the battery does not run out.
In FIG. 11, only one remote controller 55 is provided as a device capable of transmitting power from the central station 47 in a non-contact manner in this system and transmitting / receiving communication data to / from the central station 47. However, when using a plurality of remote controllers in this system, the central station 47 is provided with the same number of power transmission units 14b as the number of remote controllers, so that the plurality of remote controllers can be individually operated from the central station 47. It is also possible to transmit power in a non-contact manner and to send and receive communication data to and from the central station 47.
In addition, the device operation by the remote controller 55 shown in this embodiment includes AV devices such as TVs, video cameras, recorders, and audio systems connected to the central station 47 by wire or wirelessly, or air conditioners such as air conditioners and electric fans. It is possible for any device that can be operated with a remote control.
FIG. 12 shows the monitor display in an audio visual system such as a television in which the video display monitor display unit and the functional unit such as the tuner are separated by using the power transmission unit 14b and the power reception unit 15c shown in the fourth embodiment. It is a block diagram which showed the Example in the case of transmitting electric power. This system consists of a central station that has the function of transmitting electric power and a monitor display that has the function of receiving electric power.
The central station controls the operation of the central station, or authenticates whether or not a device receiving the power transmitted by the central station has the right to receive the power, or records or inputs data. It is provided with at least one control / signal processing unit that performs signal processing on the signal, a power transmission unit 14b shown in the fourth embodiment, and a signal input / output unit that inputs / outputs a data signal to the central station. ing. Further, whether or not the monitor display controls the operation of the power receiving unit 15c shown in the fourth embodiment and the operation of the monitor display, or whether the monitor display has the right to transmit power by the central station. A control / signal processing unit that performs authentication or performs signal processing on an input signal, a power-using unit that uses the power received by the power receiving unit 15c, and a display unit that displays video or outputs audio. It is equipped with at least one input unit for inputting operation signals from the remote control. A rechargeable battery may or may not be provided inside the power-using unit.
Hereinafter, the operation of the embodiment shown in FIG. 12 will be described in detail. The central station 47 transmits electric power as electric power 56 which is transmitted from the electric power transmitting unit 14b to the electric power receiving unit 15c of the monitor display 61 in a non-contact manner.
The monitor display 61 receives the power 56 transmitted in a non-contact manner from the power transmission unit 14b of the central station 47 by the power reception unit 15c, and extracts all or a part of the received power from the power output terminal 45. And input to the power usage unit 53. The power-using unit 53 uses the input power to drive the monitor display 61, or charges the rechargeable battery provided in the power-using unit 53.
Further, it is possible to perform data communication 57 between the power transmission unit 14b of the central station 47 and the power reception unit 15c of the monitor display 61. In this embodiment, the data communication 57 is a control signal for confirming whether or not the power 56 transmitted in a non-contact manner is a normal amount of power, and the monitor display 61 is in a non-contact manner by the central station 47. An authentication signal for confirming whether or not the device has the right to transmit power, a remote control operation signal received by the monitor display 61 from the remote control 63 by the input unit 58, and a display unit of the monitor display 61. It can be used for communication of video and audio data displayed or output in 60.
The communication of the authentication signal will be described. When the control / signal processing unit 49 of the central station 47 inputs or outputs the authentication signal and determines that the monitor display 61 is not a device having the right to transmit power in a non-contact manner by the central station 47, Stop the transmission of power from the central station 47 to the monitor display 61. Alternatively, when the control / signal processing unit 59 of the monitor display 61 inputs or outputs the authentication signal and determines that the monitor display 61 is not a device having the right to transmit power in a non-contact manner by the central station 47. Stops the reception of power by the monitor display 61.
Communication of the remote control operation signal will be described. The remote control operation signal 62 operated by the user using the remote control 63 is input from the input unit 58 of the monitor display 61. The remote control operation signal input to the input unit 58 is input to the control / signal processing unit 59. The remote control operation signal input to the control / signal processing unit 59 is subjected to signal processing and used for controlling the monitor display 61, or is input from the signal input / output terminal 46 to the power receiving unit 15c and used as the data communication 57. It is transmitted to the power transmission unit 14b of the central station 47. The power transmission unit 14b of the central station 47 outputs the received remote control operation signal from the data input / output terminal 44 and inputs it to the control / signal processing unit 49. The remote control operation signal input to the control / signal processing unit 49 is used for controlling the central station 47 by the signal processing unit 49, or is subjected to signal processing and output to the signal input / output unit 48. The signal input / output unit 48 outputs the input remote control operation signal to the device operated by the remote control 63. The device operated by the remote controller 63 is a device connected to the central station 47 by wire or wirelessly, or a device to which power is supplied from the central station 47 in a non-contact manner like the monitor display 61.
The communication of the video and audio data will be described. As for the video and audio data, a broadcast signal such as a television broadcast, or a signal recorded in a recorder, a video camera, a music player, or the like connected to the central station 47 by wire or wirelessly is a signal input / output of the central station 47. It is the signal input from the unit 48 to the central station 47, or the signal recorded in the control / signal processing unit 49 of the central station 47. The video and audio data input from the signal input / output unit 48 to the central station 47 are input to the control / signal processing unit 49. The video and audio data input to the control / signal processing unit 49 or recorded in the control / signal processing unit 49 are signal-processed and input from the data input / output terminal 44 to the power transmission unit 14b for data communication. As 57, it is transmitted to the power receiver 15c of the monitor display 61. The video and audio data received by the power receiving unit 15c is output from the data input / output terminal 46 and input to the control / signal processing unit 59. The control / signal processing unit 59 performs signal processing on the input video and audio data and outputs the signal to the display unit 60. The display unit 60 displays or outputs the input video and audio data.
The control signal, the authentication signal, the remote control operation signal, and the video and audio data are transmitted and received as data communication 57 by being superimposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing.
The system shown in this embodiment includes the non-contact power transmission device according to the present invention, and can perform non-contact power transmission to the monitor display 61 and the data communication with the same coil. It is not necessary to separately provide a coil for contact power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the monitor display 61. Further, since the wired power supply to the monitor display 61 and the wired connection for transmitting video and audio data to the monitor display 61 are not required, complicated wiring is not required, and problems due to wiring failure can be avoided. It is possible to arrange devices with a higher degree of freedom.
In FIG. 12, only one monitor display 61 is used as a device in which power is transmitted from the central station 47 in a non-contact manner in this system and communication data can be transmitted / received to / from the central station 47. However, when using multiple monitor displays in this system, the central station 47 should be equipped with the same number of power transmitters 14b as the number of monitor displays, so that the multiple monitor displays can be individually installed. It is also possible to transmit power from the central station 47 in a non-contact manner and to send and receive communication data to and from the central station 47.
Further, the system can simultaneously use the one or more monitor displays shown in the present embodiment and the one or more remote controllers shown in the fifth embodiment at the same time. When one or more monitor displays and one or more remote controllers are used at the same time, the central station 47 is provided with the same number of power transmitters 14b as the total number of monitor displays and remote controllers, so that the one or more monitor displays are provided. It is also possible to individually transmit power from the central station 47 to one or more remote controllers in a non-contact manner, and to send and receive communication data to and from the central station 47.
Further, in this embodiment, a monitor display capable of displaying or outputting the video and audio data is used, but it is also possible to use a speaker capable of handling only audio signals instead of the monitor display. .. When a speaker is used, the data communication 57 transmitted from the central station 47 is voice data. In addition, the device operation by the remote controller 63 shown in this embodiment includes AV devices such as TVs, video cameras, recorders, and audio systems connected to the central station 47 by wire or wirelessly, or air conditioners such as air conditioners and electric fans. It is possible for any device that can be operated with a remote control.
FIG. 13 shows a case where power is transmitted to the video camera in an audiovisual system that displays the image of the video camera on a television or the like using the power transmission unit 14b and the power reception unit 15c shown in the fourth embodiment. It is a block diagram which showed an example. This system consists of a central station that has the function of transmitting electric power and a video camera that has the function of receiving electric power.
The central station controls the operation of the central station, or authenticates whether or not a device receiving the power transmitted by the central station has the right to receive the power, or records or inputs data. It is provided with at least one control / signal processing unit that performs signal processing on the signal, a power transmission unit 14b shown in the fourth embodiment, and a signal input / output unit that inputs / outputs a data signal to the central station. ing. The video camera controls the operation of the video camera with the power receiving unit 15c shown in the fourth embodiment, or authenticates whether or not the video camera has the right to transmit power by the central station. A control / signal processing unit that performs signal processing on an input or input signal, a power-using unit that uses the power received by the power receiving unit 15c, a recording device that records video and audio data, and video and audio. It is provided with at least one imaging unit for photographing and recording the image. A rechargeable battery may or may not be provided inside the power-using unit.
Hereinafter, the operation of the embodiment shown in FIG. 13 will be described in detail. The central station 47 transmits power as power 64, which is transmitted from the power transmitting unit 14b to the power receiving unit 15c of the video camera 68 in a non-contact manner.
The video camera 68 receives the non-contact power 64 transmitted from the power transmission unit 14b of the central station 47 at the power reception unit 15c, and extracts all or part of the received power from the power output terminal 45. And input to the power usage unit 53. The power-using unit 53 uses the input power to drive the video camera 68, or charges the rechargeable battery provided in the power-using unit 53.
Further, it is possible to perform data communication 65 between the power transmission unit 14b of the central station 47 and the power reception unit 15c of the video camera 68. In this embodiment, the data communication 65 is a control signal for confirming whether or not the power 64 transmitted in a non-contact manner is a normal amount of power, and the video camera 68 is in a non-contact manner by the central station 47. An authentication signal for confirming whether or not the device has the right to transmit power, and video and audio data recorded in the recording device 66 of the video camera 68, or photographed by the imaging unit 89. It can be used for communication of video and audio data.
The communication of the authentication signal will be described. If the control / signal processing unit 49 of the central station 47 inputs or outputs the authentication signal and determines that the video camera 68 is not a device that has the right to transmit power contactlessly by the central station 47, Stop the transmission of power from the central station 47 to the video camera 68. Alternatively, when the control / signal processing unit 67 of the video camera 68 inputs or outputs the authentication signal and determines that the video camera 68 is not a device having the right to transmit power in a non-contact manner by the central station 47. Stops the reception of power by the video camera 68.
The communication of the video and audio data will be described. The video and audio data are those recorded in the recording device 66 provided in the video camera 68, or those photographed and recorded by the imaging unit 89. The video and audio data recorded in the recording device 66 or captured and recorded by the imaging unit 89 is input to the control / signal processing unit 67 and subjected to signal processing. The video and audio data subjected to the signal processing are input from the data input / output terminal 46 to the power receiving unit 15c, and are transmitted to the power transmitting unit 14b of the central station 47 as data communication 65. The video and audio data received by the power transmission unit 14b is output from the data input / output terminal 44 and input to the control / signal processing unit 49. The video and audio data input to the control / signal processing unit 49 are subjected to signal processing and output to the signal input / output unit 48, or recorded in the control / signal processing unit 49. The signal input / output unit 48 outputs the input video and audio data to a device connected to the central station 47 by wire or wirelessly. Further, when the central station 47 is provided with two or more power transmission units 14b, it is possible to transmit the video and audio data to the monitor display 61 as shown in the sixth embodiment.
The control signal, the authentication signal, and the video and audio data are superposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing, and are transmitted and received as data communication 65.
The system shown in this embodiment includes the non-contact power transmission device according to the present invention, and can perform non-contact power transmission to the video camera 68 and the data communication with the same coil. It is not necessary to separately provide a coil for contact power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the video camera 68. Furthermore, since there is no need for a wired power supply to the camcorder 68 and a wired connection for transmitting the video and audio data recorded on the camcorder 68, complicated wiring is not required, and problems due to wiring failure are avoided. , And the arrangement of equipment with a higher degree of freedom becomes possible.
In FIG. 13, only one video camera 68 is used as a device in which power is transmitted from the central station 47 in a non-contact manner in this system and communication data can be transmitted / received to / from the central station 47. However, when using multiple video cameras in this system, the central station 47 is equipped with the same number of power transmitters 14b as the number of video cameras, so that the multiple video cameras can be individually installed. It is also possible to transmit power from the central station 47 in a non-contact manner and to send and receive communication data to and from the central station 47.
Further, in this system, at the same time as one or more video cameras shown in the present embodiment, one or more remote controllers shown in the fifth embodiment are simultaneously used, and one or more monitor displays shown in the sixth embodiment. Can be used at the same time. When using one or more camcorders, one or more remote controllers, and one or more monitor displays at the same time, the central station 47 has the same number of power transmitters 14b as the total number of camcorders, remote controllers, and monitor displays. This allows non-contact power transmission from the central station 47 to the one or more camcorders and one or more remote controls and one or more monitor displays individually, and also communicates with the central station 47. It is also possible to send and receive data.
FIG. 14 shows a case where power is transmitted to the recorder in an audiovisual system that uses the power transmitting unit 14b and the power receiving unit 15c shown in the fourth embodiment to display the video recorded on the recorder on a television or the like. It is a block diagram which showed an example. This system consists of a central station that has the function of transmitting electric power and a recorder that has the function of receiving electric power.
The central station controls the operation of the central station, or authenticates whether or not a device receiving the power transmitted by the central station has the right to receive the power, or records or inputs data. It is provided with at least one control / signal processing unit that performs signal processing on the signal, a power transmission unit 14b shown in the fourth embodiment, and a signal input / output unit that inputs / outputs a data signal to the central station. ing. The recorder controls the operation of the power receiving unit 15c shown in the fourth embodiment and the operation of the recorder, or authenticates whether or not the recorder has the right to transmit power by the central station. At least one of a control / signal processing unit that performs signal processing on the input signal, a power-using unit that uses the power received by the power receiving unit 15c, and a recording device that records video and audio data. I have one. A rechargeable battery may or may not be provided inside the power-using unit.
Hereinafter, the operation of the embodiment shown in FIG. 14 will be described in detail. The central station 47 transmits electric power as electric power 69 which is transmitted from the electric power transmitting unit 14b to the electric power receiving unit 15c of the recorder 73 in a non-contact manner.
The recorder 73 receives the non-contact power 69 transmitted from the power transmission unit 14b of the central station 47 at the power reception unit 15c, and takes out all or a part of the received power from the power output terminal 45. Input to the power usage unit 53. The power-using unit 53 uses the input power to drive the recorder 73, or charges the rechargeable battery provided in the power-using unit 53.
Further, it is possible to perform data communication 70 between the power transmission unit 14b of the central station 47 and the power reception unit 15c of the recorder 73. In this embodiment, the data communication 70 is a control signal for confirming whether or not the power 69 transmitted in a non-contact manner is a normal amount of power, and the recorder 73 is a power source in a non-contact manner by the central station 47. The authentication signal for confirming the authentication of the device having the right to transmit the data, the video and audio data recorded in the recording device 71 of the recorder 73, and the recording device 71 of the recorder 73. It can be used for communication of video and audio data.
The communication of the authentication signal will be described. If the control / signal processing unit 49 of the central station 47 inputs or outputs the authentication signal and determines that the recorder 73 is not a device that has the right to transmit power in a non-contact manner by the central station 47, it is central. Stop the transmission of power from station 47 to recorder 73. Alternatively, if the control / signal processing unit 72 of the recorder 73 inputs or outputs the authentication signal and determines that the recorder 73 is not a device having the right to transmit power in a non-contact manner by the central station 47, Stops the reception of power by the recorder 73.
The communication of the video and audio data will be described. The video and audio data transmitted from the central station 47 to the recorder 73 was recorded in a broadcast signal such as a television broadcast, or in a recorder, video camera, music player, or the like connected to the central station 47 by wire or wirelessly. The signal is a signal input from the signal input / output unit 48 of the central station 47 to the central station 47, or a signal recorded in the control / signal processing unit 49 provided in the central station 47. The video and audio data transmitted from the recorder 73 to the central station 47 was recorded in the recording device 71 provided in the recorder 73.
First, a case where the video and audio data is transmitted from the central station 47 to the recorder 73 will be described. The video and audio data input from the signal input / output unit 48 to the central station 47 are input to the control / signal processing unit 49. The video and audio data input to the control / signal processing unit 49 or recorded in the control / signal processing unit 49 are signal-processed and input from the data input / output terminal 44 to the power transmission unit 14b for data communication. As 70, it is transmitted to the power receiver 15c of the recorder 73. The video and audio data received by the power receiving unit 15c is output from the data input / output terminal 46 and input to the control / signal processing unit 72. The control / signal processing unit 72 performs signal processing on the input video and audio data and records them in the recording device 71.
Next, a case where the video and audio data is transmitted from the recorder 73 to the central station 47 will be described. The video and audio data recorded in the recording device 66 are input to the control / signal processing unit 72 and subjected to signal processing. The video and audio data subjected to the signal processing are input from the data input / output terminal 46 to the power receiving unit 15c, and are transmitted to the power transmitting unit 14b of the central station 47 as data communication 70. The video and audio data received by the power transmission unit 14b is output from the data input / output terminal 44 and input to the control / signal processing unit 49. The video and audio data input to the control / signal processing unit 49 are subjected to signal processing and output to the signal input / output unit 48, or recorded in the control / signal processing unit 49. The signal input / output unit 48 outputs the input video and audio data to a device connected to the central station 47 by wire or wirelessly. Further, when the central station 47 is provided with two or more power transmission units 14b, it is possible to transmit the video and audio data to the monitor display 61 as shown in the sixth embodiment.
The control signal, the authentication signal, and the video and audio data are superposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing, and are transmitted and received as data communication 70.
The system shown in this embodiment includes the non-contact power transmission device according to the present invention, and since it is possible to perform non-contact power transmission to the recorder 73 and the data communication with the same coil, non-contact power transmission is possible. It is not necessary to separately provide a coil for power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the recorder 73. Furthermore, since there is no need for a wired power supply to the recorder 73 and a wired connection for transmitting the video and audio data recorded on the recorder 73, complicated wiring is not required, and problems due to wiring failure can be avoided. , It is possible to arrange equipment with a higher degree of freedom.
In FIG. 14, only one recorder 73 is provided as a device capable of transmitting power from the central station 47 in a non-contact manner in this system and transmitting / receiving communication data to / from the central station 47. However, when using a plurality of recorders in this system, the central station 47 is provided with the same number of power transmission units 14b as the number of recorders, so that the central station 47 can be individually used for the plurality of recorders. It is also possible to transmit power in a non-contact manner from the central station 47 and to send and receive communication data to and from the central station 47.
Further, the system simultaneously displays one or more recorders shown in the present embodiment, one or more remote controllers shown in the fifth embodiment, and one or more monitor displays shown in the sixth embodiment. At the same time, it is also possible to use one or more video cameras shown in the seventh embodiment at the same time. When using one or more recorders and one or more remote controls and one or more monitor displays and one or more camcorders at the same time, the central station 47 has the same number as the total number of recorders, remote controls, monitor displays and camcorders. By providing the power transmitter 14b, one or more recorders, one or more remote controls, one or more monitor displays, and one or more video cameras can be individually contacted from the central station 47 in a non-contact manner. It is also possible to transmit power and to send and receive communication data to and from the central station 47.
FIG. 15 is a block diagram showing an embodiment of a portable device charging system using the power transmitting unit 14b and the power receiving unit 15c shown in the fourth embodiment. This system consists of a mobile device charging device having a function of transmitting electric power and a mobile device having a function of receiving electric power.
The portable device charging device controls the operation of the portable device charging device, or authenticates whether or not a device that receives the power transmitted by the portable device charging device has the right to receive the power, or inputs. It is provided with at least one control / signal processing unit that performs signal processing on the signal, and the power transmission unit 14b shown in the fourth embodiment. The mobile device includes a power receiving unit 15c shown in the fourth embodiment, a control / signal processing unit that authenticates whether or not the mobile device has the right to transmit electric power by the mobile device charging device. Each of the power receiving unit 15c includes at least one charging unit that uses the power received by the power receiving unit 15c to drive or charge the portable device.
Hereinafter, the operation of the embodiment shown in FIG. 15 will be described in detail. The mobile device charging device 74 transmits electric power as electric power 75 which is transmitted from the power transmitting unit 14b to the power receiving unit 15c of the mobile device 80 in a non-contact manner.
The mobile device 80 receives the power 75 transmitted in a non-contact manner from the power transmitting unit 14b of the mobile device charging device 74 by the power receiving unit 15c, and receives all or a part of the received power at the power output terminal 45. Take it out from and input it to the charging unit 79. The charging unit 79 uses the input electric power to drive or charge the mobile device 80. Further, it is possible to perform data communication 76 between the power transmitting unit 14b of the portable device charging device 74 and the power receiving unit 15c of the mobile device 80.
In this embodiment, the data communication 76 is a control signal for confirming whether or not the power 75 transmitted in a non-contact manner is a normal electric energy, and the mobile device 80 is not controlled by the mobile device charging device 74. It can be used for communication of an authentication signal for confirming authentication as to whether or not the device has the right to transmit power by contact.
The communication of the authentication signal will be described. The control / signal processing unit 78 of the mobile device charging device 74 inputs or outputs the authentication signal, and determines that the mobile device 80 is not a device having the right to transmit power in a non-contact manner by the mobile device charging device 74. If this happens, the transmission of power to the mobile device 80 by the mobile device charging device 74 is stopped. Alternatively, the control / signal processing unit 77 of the mobile device 80 inputs or outputs the authentication signal, and determines that the mobile device 80 is not a device having the right to transmit power in a non-contact manner by the mobile device charging device 74. If so, the reception of power by the mobile device 80 is stopped.
The control signal and the authentication signal are superposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing, and are transmitted and received as data communication 76. The system shown in this embodiment includes the non-contact power transmission device according to the present invention, and can perform non-contact power transmission to the mobile device 80 and the data communication with the same coil. It is not necessary to separately provide a coil for contact power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the portable device 80. Further, since a wired connection for supplying electric power to the mobile device 80 by wire is not required, it is possible to arrange the devices with a high degree of freedom.
In FIG. 15, the mobile device 80 is a device capable of transmitting power from the mobile device charging device 74 in a non-contact manner in this system and transmitting / receiving communication data to / from the mobile device charging device 74. Has only one. However, it is also possible to individually transmit power from the mobile device charging device 74 to a plurality of mobile devices in a non-contact manner, and to send and receive communication data to and from the mobile device charging device 74. However, when the above-mentioned plurality of mobile devices are used, it is necessary that the mobile device charging device 74 is provided with the same number of power transmission units 14b as the number of mobile devices.
In FIG. 15, the mobile device 80 is a device capable of transmitting power from the mobile device charging device 74 in a non-contact manner in this system and transmitting / receiving communication data to / from the mobile device charging device 74. However, when using a plurality of mobile devices in this system, the portable device charging device 74 is provided with the same number of power transmitters 14b as the number of mobile devices. On the other hand, it is also possible to individually transmit power from the mobile device charging device 74 in a non-contact manner, and to send and receive communication data to and from the mobile device charging device 74.
FIG. 16 is a block diagram showing an example of a wireless LAN system using the power transmitting unit 14b and the power receiving unit 15c shown in the fourth embodiment. This system consists of a wireless LAN terminal that has a function of transmitting electric power and a mobile terminal device that has a function of receiving electric power.
The wireless LAN terminal has the right of the power transmission unit 14b shown in the fourth embodiment and a device that controls the operation of the wireless LAN terminal or receives the power transmitted by the wireless LAN terminal to receive the power. The mobile terminal is provided with at least one control / signal processing unit that authenticates whether or not the input signal is processed, and a connection unit that connects the wireless LAN terminal to the LAN. The device includes a power receiving unit 15c shown in the fourth embodiment, a control / signal processing unit that authenticates whether or not the mobile terminal device has the right to transmit power by the wireless LAN terminal, and the power. Each of the receiving unit 15c has at least one charging unit that uses the received power.
Hereinafter, the operation of the embodiment shown in FIG. 16 will be described in detail. The wireless LAN terminal 81 transmits electric power as electric power 84 which is transmitted from the electric power transmitting unit 14b to the electric power receiving unit 15c of the mobile terminal device 87 in a non-contact manner.
The mobile terminal device 87 receives the power 84 transmitted from the power transmission unit 14b of the wireless LAN terminal 81 in a non-contact manner by the power reception unit 15c, and receives all or part of the received power in the power output terminal 45. Take out from and input to the charging unit 88. The charging unit 88 uses the input electric power to drive or charge the mobile terminal device 87. Further, it is possible to perform data communication 85 between the power transmission unit 14b of the wireless LAN terminal 81 and the power reception unit 15c of the mobile terminal device 87.
In this embodiment, the data communication 85 is a control signal for confirming whether or not the power 84 transmitted in a non-contact manner is a normal amount of power, and the mobile terminal device 87 is not operated by the wireless LAN terminal 81. It can be used for communication of authentication signals for confirming authentication of whether or not the device has the right to transmit power by contact, and wireless LAN communication data.
The communication of the authentication signal will be described. The control / signal processing unit 83 of the wireless LAN terminal 81 inputs or outputs the authentication signal, and determines that the mobile terminal device 87 is not a device having the right to transmit power in a non-contact manner by the wireless LAN terminal 81. In this case, the transmission of power from the wireless LAN terminal 81 to the mobile terminal device 87 is stopped. Alternatively, the control / signal processing unit 86 of the mobile terminal device 87 is not a device that inputs or outputs the authentication signal and the mobile terminal device 87 has the right to transmit power in a non-contact manner by the wireless LAN terminal 81. If it is determined, the mobile terminal device 87 stops receiving power.
The communication of the wireless LAN communication data will be described. A case where the mobile terminal device 87 receives the wireless LAN communication data will be described. The wireless LAN communication data input from the connection unit 82 to the wireless LAN terminal 81 is input to the control / signal processing unit 83 and subjected to signal processing. The signal-processed wireless LAN communication data is input from the data input / output terminal 44 to the power transmission unit 14b, and is transmitted to the power reception unit 15c of the mobile terminal device 87 as data communication 85. The wireless LAN communication data received by the power receiving unit 15c is output from the data input / output terminal 46 and input to the control / signal processing unit 86. The control / signal processing unit 86 performs signal processing on the input wireless LAN communication data, and the reception of the wireless LAN communication data of the mobile terminal device 87 is completed.
Next, a case where the mobile terminal device 87 transmits wireless LAN communication data will be described. The mobile terminal device 87 performs signal processing on the wireless LAN communication data to be transmitted by the control / signal processing unit 86. The signal-processed wireless LAN communication data is input from the data input / output terminal 46 to the power receiving unit 15c, and is transmitted to the power transmitting unit 14b of the wireless LAN terminal 81 as data communication 85. The wireless LAN communication data received by the power transmission unit 14b is output from the data input / output terminal 44 and input to the control / signal processing unit 83. The wireless LAN communication data input to the control / signal processing unit 83 is subjected to signal processing and output from the connection unit 82, and the transmission of the wireless LAN communication data of the mobile terminal device 87 is completed.
The control signal, the authentication signal, and the wireless LAN communication data are transmitted and received as data communication 85 by being superimposed on each other by time division multiplexing, frequency division multiplexing, or code division multiplexing.
Since the system shown in this embodiment includes the non-contact power transmission device according to the present invention, it is possible to perform the non-contact power transmission to the mobile terminal device 87 and the data communication with the same coil. It is not necessary to separately provide a coil for non-contact power transmission and a coil for data communication, which makes it possible to reduce the size, weight, and price of the mobile terminal device 87. Further, since a wired connection for supplying electric power to the mobile terminal device 87 is not required, complicated wiring is not required, and devices with a high degree of freedom can be arranged.
In FIG. 16, the mobile terminal device 87 is used as a device capable of transmitting power from the wireless LAN terminal 81 in a non-contact manner in this system and transmitting / receiving communication data to / from the wireless LAN terminal 81. Although only one is provided, when using multiple mobile terminal devices in this system, the wireless LAN terminal 81 is provided with the same number of power transmission units 14b as the number of mobile terminal devices, so that the above-mentioned multiple mobile terminals are provided. It is also possible to individually transmit power to the device from the wireless LAN terminal 81 in a non-contact manner, and to send and receive communication data to and from the wireless LAN terminal 81.
Although the present invention has been described in detail above, it goes without saying that the present invention is not limited to the examples of the non-contact power transmission device described here, and can be widely applied to other non-contact power transmission devices. No.
<figref num="1">It is a block diagram of the non-contact power transmission apparatus which shows one Example of this invention.</figref><figref num="2">It is a block diagram of the power transmission coil and the power reception coil in one Example of this invention.</figref><figref num="3">It is a block diagram of the signal generation part in one Example of this invention.</figref><figref num="4">It is a block diagram of the signal generation part in one Example of this invention.</figref><figref num="5">It is a block diagram of the modulation / demodulation part in one Example of this invention.</figref><figref num="6">It is a flowchart of the power transmission stop processing in one Example of this invention.</figref><figref num="7">It is a block diagram of the signal generation part in one Example of this invention.</figref><figref num="8">It is a block diagram of the power receiving part in one Example of this invention.</figref><figref num="9">It is a block diagram of the power transmission part in one Example of this invention.</figref><figref num="10">It is a block diagram of the power receiving part in one Example of this invention.</figref><figref num="11">It is a block diagram of the audiovisual control system in one Example of this invention.</figref><figref num="12">It is a block diagram of the audiovisual control system in one Example of this invention.</figref><figref num="13">It is a block diagram of the audiovisual control system in one Example of this invention.</figref><figref num="14">It is a block diagram of the audiovisual control system in one Example of this invention.</figref><figref num="15">It is a block diagram of the portable device charging system in one Example of this invention.</figref><figref num="16">It is a block diagram of the wireless LAN system in one Example of this invention.</figref>
Code description
1: Signal generator, 4: Transmission coil, 7,7b, 7c: Load unit, 9: Power receiving coil, 13,13b: Modulation / demodulation unit, 14,14b: Power transmitter, 15,15b, 15c: Power receiver, 16,16b: Modulation / demodulation section, 20,20b: Signal generator, 21: Primary coil, 22: Secondary coil, 23: Primary coil, 24: Secondary coil, 25a, 25b: Multiplier / divider, 26,27 : Filter circuit, 28: Amplifier, 29: Oscillator, 30: Modulator, 31: Switching circuit, 32: Filter circuit, 33: Demodulator, 34,34b: Control unit, 38,39: Filter circuit, 40: Multiplying Divider, 41: Oscillator, 47: Central station, 48: Signal input / output unit, 49: Control / signal processing unit, 52: Input unit, 53: Power usage unit, 54: Control / signal processing unit, 55: Remote control , 58: Input unit, 59: Control / signal processing unit, 60: Display unit, 61: Monitor display, 63: Remote control, 66: Recording device, 67: Control / signal processing unit, 68: Video camera, 71: Recording device , 72: Control / signal processing unit, 73: Recorder, 74: Portable device charging device, 77,78: Control / signal processing unit, 79: Charging unit, 80: Portable device, 81: Wireless LAN terminal, 82: Connection unit , 83: Control / signal processing unit, 86: Control / signal processing unit, 87: Mobile terminal device, 88: Charging unit, 89: Imaging unit.
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Numbers
- Publication
- 2010141966
- Application
- 313468
Titles2
- Japanese
- 非接触電力送信装置、非接触電力受信装置および非接触電力伝送システム
- English
- Contactless power transmitter, contactless power receiver and contactless power transfer system
Classification
- IPC, 3
- H04B5 48
- H02J17 00
- H04B5 02