Power-supply control device, power supply system, and electronic device
5 claims: 4 independent, 1 dependent
- 1負荷回路に電力を供給するためのメイン電源と、スタンバイ電源とを備えた電源を制御するための電源制御装置であって、 前記負荷回路は、前記メイン電源からの電力の供給が必要な第1の状態と、前記メイン電源からの電力の供給を必要としない第2の状態とを相互に切換え可能であり、 前記電源制御装置は、 前記第1の状態と前記第2の状態との間での前記負荷回路の状態の変化を判定するための判定部と、 前記第1の状態から前記第2の状態への前記変化が前記判定部によって判定された場合に、前記メイン電源を停止させるための制御部とを備え、 前記スタンバイ電源は、前記スタンバイ電源の平滑回路の出力端、 キャパシタ および前記電源制御装置が共通に接続されるノードを有し、 前記電源制御装置は、前記ノードから電力を受け、 前記 キャパシタ は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記ノードに電力を供給し、 前記制御部は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記 キャパシタ に電力を補充するために前記スタンバイ電源を間欠的に起動し、 前記制御部は、前記スタンバイ電源を間欠的に起動する場合において、前記スタンバイ電源の動作時間を計測して、前記スタンバイ電源の損失と単位時間あたりの起動回数との間の関係から 、前記スタンバイ電源の効率が最大となる 予め定められた時間となるように前記動作時間を制御するとともに、前記スタンバイ電源の起動の周期を、 雰囲気温度による前記キャパシタの電荷の減少量の変化を考慮して前記キャパシタの充電の時間間隔を学習した結果である、 過去の履歴に基づいて制御する、電源制御装置。
- 2前記制御部は、前記第2の状態から前記第1の状態への前記変化が前記判定部によって判定された場合に、前記負荷回路への電力の供給のために前記メイン電源を起動する、請求項1に記載の電源制御装置。
- 3前記電源制御装置は、前記ノードの電圧が、前記電源制御装置の動作電圧の範囲の下限値より大きく、かつ、前記 キャパシタ の満充電状態における電圧以下となるように、前記スタンバイ電源が間欠的に起動された際における前記スタンバイ電源の動作期間を制御する、請求項1に記載の電源制御装置。
- 4負荷回路に電力を供給するためのメイン電源と、スタンバイ電源とを含む電源を備え、 前記負荷回路は、前記メイン電源からの電力の供給が必要な第1の状態と、前記メイン電源からの電力の供給を必要としない第2の状態とを相互に切換え可能であり、 前記電源を制御するための電源制御装置をさらに備え、 前記電源制御装置は、 前記第1の状態と前記第2の状態との間での前記負荷回路の状態の変化を判定するための判定部と、 前記第1の状態から前記第2の状態への前記変化が前記判定部によって判定された場合に、前記電源を停止させるための制御部とを含み、 前記スタンバイ電源は、前記スタンバイ電源の平滑回路の出力端、 キャパシタ および前記電源制御装置が共通に接続されるノードを有し、 前記電源制御装置は、前記ノードから電力を受け、 前記 キャパシタ は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記ノードに電力を供給し、 前記制御部は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記 キャパシタ に電力を補充するために前記スタンバイ電源を間欠的に起動し、 前記制御部は、前記スタンバイ電源を間欠的に起動する場合において、前記スタンバイ電源の動作時間を計測して、前記スタンバイ電源の損失と単位時間あたりの起動回数との間の関係から 、前記スタンバイ電源の効率が最大となる 予め定められた時間となるように前記動作時間を制御するとともに、前記スタンバイ電源の起動の周期を、 雰囲気温度による前記キャパシタの電荷の減少量の変化を考慮して前記キャパシタの充電の時間間隔を学習した結果である、 過去の履歴に基づいて制御する、電源システム。
- 5メイン電源と、スタンバイ電源とを含む電源と、 前記メイン電源からの電力の供給が必要な第1の状態と、前記メイン電源からの電力の供給を必要としない第2の状態とを相互に切換え可能に構成された負荷回路と、 前記電源を制御するための電源制御装置とを備え、 前記電源制御装置は、 前記第1の状態と前記第2の状態との間での前記負荷回路の状態の変化を判定するための判定部と、 前記第1の状態から前記第2の状態への前記変化が前記判定部によって判定された場合に、前記電源を停止させるための制御部とを含み、 前記スタンバイ電源は、前記スタンバイ電源の平滑回路の出力端、 キャパシタ および前記電源制御装置が共通に接続されるノードを有し、 前記電源制御装置は、前記ノードから電力を受け、 前記 キャパシタ は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記ノードに電力を供給し、 前記制御部は、前記負荷回路の前記第1の状態から前記第2の状態への前記変化によって前記メイン電源が停止した後には、前記 キャパシタ に電力を補充するために前記スタンバイ電源を間欠的に起動し、 前記制御部は、前記スタンバイ電源を間欠的に起動する場合において、前記スタンバイ電源の動作時間を計測して、前記スタンバイ電源の損失と単位時間あたりの起動回数との間の関係から 、前記スタンバイ電源の効率が最大となる 予め定められた時間となるように前記動作時間を制御するとともに、前記スタンバイ電源の起動の周期を、 雰囲気温度による前記キャパシタの電荷の減少量の変化を考慮して前記キャパシタの充電の時間間隔を学習した結果である、 過去の履歴に基づいて制御する、電子機器。
Independent claims5
69 paragraphs, as filed
The present invention relates to power control devices, power systems and electronic devices. The present invention particularly relates to a power supply control device for reducing power loss, a power supply system including the power supply control device, and an electronic device including the power supply system.
Electronic devices generally have a power source for driving a load circuit. In recent years, many electronic devices (typically television receivers) have a main power supply circuit that supplies power supply voltage to each part of the device body, a remote control light receiving circuit, or a microcomputer (hereinafter, also referred to as a microcomputer). It is equipped with a standby power supply circuit for operating such as.
The standby power supply circuit supplies the power supply voltage to the light receiving circuit of the remote controller, the microcomputer, or the like even when the main power supply circuit is in the off state. For example, when the remote controller instructs the light receiving circuit to turn on the power, the main power circuit operates under the control of the microcomputer. On the other hand, when the remote controller instructs the light receiving circuit to turn off the power, the main power circuit is stopped by the control of the microcomputer. When the electronic device is on standby, the power consumption of the device itself is reduced. The loss of the main power supply circuit is suppressed by stopping the main power supply circuit. Therefore, it is possible to reduce the standby power of the electronic device.
For example, Japanese Patent Application Laid-Open No. 2004-23894 (Patent Document 1) discloses an electronic device including a main power supply circuit and a standby power supply circuit. The standby power supply circuit is composed of a switching power supply. This switching power supply includes means for detecting the surge voltage generated when the AC power supply is turned on. When a surge voltage is detected by this detection means, the switching control circuit prohibits the operation of the MOSFET (Metal Oxide Semiconductor Field Effect Transistor) which is a switching element.
<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2004-23894</text></patcit></p>
<p> As described above, the standby power supply circuit can reduce the power consumption of the electronic device during standby. However, the power consumption of the electronic device during the operation of the standby power supply circuit includes the loss of the standby power supply circuit. In order to reduce the standby power consumption of electronic devices, it is preferable to reduce the loss of the standby power supply circuit. However, Patent Document 1 does not particularly describe such a problem regarding power loss.</p><p> An object of the present invention is to provide a power supply control device, a power supply system including the power supply control device, and an electronic device for making it possible to reduce the loss of the power supply in a state where the power consumption of the load circuit is small.</p>
<p> The present invention is, in one aspect, a power supply control device for controlling the power supply of a load circuit. The load circuit can switch between a first state in which power is required to be supplied from the power source and a second state in which power is not supplied from the power source. The power supply control device has a determination unit for determining a change in the state of the load circuit between the first state and the second state, and a determination unit for determining the change from the first state to the second state. It is provided with a control unit for stopping the power supply when it is determined.</p><p> Preferably, the control unit activates the power supply to supply power to the load circuit when the determination unit determines a change from the second state to the first state.</p><p> Preferably, the power supply has a node to which the power storage device and the power supply control device are commonly connected. The power controller receives power from the node. The control unit intermittently starts the power supply to replenish the power storage device after the power supply is stopped due to the change from the first state to the second state of the load circuit.</p><p> Preferably, the power supply controller is intermittently turned on so that the voltage of the node is greater than the lower limit of the operating voltage range of the power supply controller and less than or equal to the voltage of the power storage device in the fully charged state. Controls the operating period of the power supply at the time.</p><p> The present invention, in other aspects, is a power supply system comprising a power source for supplying power to the load circuit. The load circuit can switch between a first state in which power is required to be supplied from the power source and a second state in which power is not supplied from the power source. The power supply system further comprises a power supply control device for controlling the power supply. The power supply control device has a determination unit for determining the change in the state of the load circuit between the first state and the second state, and a determination unit for determining the change from the first state to the second state. It includes a control unit for stopping the power supply when the power supply is stopped.</p><p> In yet another aspect, the present invention is an electronic device comprising a power supply, a load circuit, and a power supply control device for controlling the power supply. The load circuit is configured to be able to switch between a first state in which power is required to be supplied from the power source and a second state in which power is not supplied from the power source. The power supply control device has a determination unit for determining the change in the state of the load circuit between the first state and the second state, and a determination unit for determining the change from the first state to the second state. It includes a control unit for stopping the power supply when the power supply is stopped.</p>
<p> According to the present invention, it is possible to reduce the loss of the power supply itself when the power consumption of the electronic device main body (load circuit) is small.</p>
<figref num="1">It is a block diagram which conceptually showed the structure of the electronic device which comprises the power-source system which concerns on embodiment of this invention.</figref><figref num="2">It is a block diagram which showed the more specific configuration example of the electronic device 100 shown in FIG.</figref><figref num="3">It is a circuit diagram which shows one configuration example of the standby power source 14 shown in FIG.</figref><figref num="4">It is a figure for demonstrating the loss when the standby power source 14 shown in FIG. 2 operates steadily.</figref><figref num="5">It is a figure for demonstrating the effect by embodiment of this invention.</figref><figref num="6">It is a block diagram which shows the structure of the power supply control device 4 which concerns on this embodiment.</figref><figref num="7">FIG. 5 is a waveform diagram showing the operation of the power supply control device 4 having the configuration shown in FIG.</figref><figref num="8">It is a figure which showed the relationship between the start-up time (time ton) of a standby power source 14 and the loss of a standby power source 14.</figref><figref num="9">It is a figure which showed the relationship between the start-up time (time ton) of a standby power source 14 and the number of start-up times of a standby power source 14 per unit time.</figref><figref num="10">It is a figure which showed the relationship between the efficiency of a standby power source 14 and the start-up time (time ton) of a standby power source 14.</figref><figref num="11">It is a block diagram which showed the structure of the modification of the electronic device 100 which concerns on embodiment of this invention.</figref>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description is not repeated.
FIG. 1 is a block diagram conceptually showing the configuration of an electronic device including a power supply system according to an embodiment of the present invention.
With reference to FIG. 1, the electronic device 100 includes a power supply system 1 and a load circuit 2 connected to the power supply system 1. The load circuit 2 switches between the first mode and the second mode. In the first mode, the load circuit 2 operates on the power supplied by the power supply system 1. Hereinafter, the first mode is also referred to as a "normal operation mode".
On the other hand, in the second mode, the load circuit 2 does not need to be supplied with power from the power supply system 1. For example, the load circuit 2 goes into a standby state in the second mode and continues to operate by supplying power from another power source (for example, a power storage device) not shown in FIG. Hereinafter, the second mode is also referred to as a "standby mode". The load circuit 2 may stop its operation in the second mode.
The power supply system 1 includes a power supply 3, a power supply control device 4, and a start signal generation circuit 5. The power supply 3 includes a plug 6 connected to an outlet to receive AC power, and an AC / DC converter 7 for converting AC power input through the plug 6 into DC power. The DC power generated by the AC / DC converter 7 is supplied to the load circuit 2 and the power supply control device 4.
The power supply control device 4 stops the AC / DC converter 7 in response to the mode of the load circuit 2 being switched from the first mode to the second mode. On the other hand, the power supply control device 4 activates the AC / DC converter 7 in response to the activation signal from the activation signal generation circuit 5. The start signal is a signal for switching the mode of the load circuit 2 from the second mode to the first mode.
While the mode of the load circuit 2 is the second mode, the power supply control device 4 continues its operation by the electric power stored in the power storage device (not shown). Further, as will be described later, the power supply control device 4 intermittently activates the AC / DC converter 7 in order to replenish the power storage device with electric power.
FIG. 2 is a block diagram showing a more specific configuration example of the electronic device 100 shown in FIG. With reference to FIG. 2, electronic device 100 is a television receiver. The load circuit 2 includes a display circuit for displaying an image, a playback circuit for reproducing sound, and a standby circuit (microcomputer, clock, etc.) that controls the operation of the load circuit 2 when the television receiver is on standby. Including.
The power supply 3 includes a plug 6, a mechanical switch 11, an AC / DC converter 7, a power supply control device 4, a start signal generation circuit 5, and a power storage device 15. The AC / DC converter 7 includes a main power switch 12, a main power 13, and a standby power 14.
The mechanical switch 11 is a switch for supplying AC power (for example, AC 100V) from a commercial power source to the AC / DC converter 7 or stopping the supply of AC power to the AC / DC converter 7. The main power switch 12 is provided, for example, in front of the main power supply 13. However, the main power switch 12 may be built in the main power supply 13.
In this embodiment, the main power switch 12 is controlled by the power control device 4. When the main power switch 12 is turned on, the main power 13 converts AC power into DC power. For example, the main power supply 13 may be composed of a switching power supply, or may be a rectifier circuit composed of a diode bridge and a smoothing capacitor.
The load circuit 2 operates by the electric power supplied from the main power source 13 in the normal operation mode.
The start-up signal generation circuit 5 receives a light receiving circuit 18 for receiving an optical signal (infrared signal) from the remote controller 20 and EPG (Electric Program Guide) data sent by a broadcast radio wave or the like. Includes EPG data receiving circuit 19. The EPG data receiving circuit 19 transmits the EPG data to the load circuit 2.
The light receiving circuit 18 receives the power off signal transmitted from the remote controller 20, and also transmits the power off signal to the load circuit 2. In response to the signal from the light receiving circuit 18, the load circuit 2 changes its state from the normal operation mode (first mode described above) to the standby mode (second mode described above), and the load circuit 2 stands by. A signal indicating that the mode has been entered is transmitted to the power supply control device 4. The power control device 4 turns off the main power switch 12 and stops the standby power supply 14 in response to the signal from the load circuit 2.
When the main power switch 12 is turned off, the main power 13 is stopped. After the operation of the standby power supply 14 is stopped, the power supply control device 4 and the start signal generation circuit 5 operate by the electric power stored in the power storage device 15. The power storage device 15 may supply electric power to the standby circuit included in the load circuit 2.
The power storage device 15 is composed of, for example, a storage battery or a capacitor. However, the type of the power storage device 15 is not particularly limited as long as it is configured so that it can be charged and discharged. Due to the operation of the power supply control device 4 and the start signal generation circuit 5, the electric power stored in the power storage device 15 gradually decreases. The power control device 4 activates only the standby power supply 14 in order to replenish the power storage device 15.
The standby power supply 14 converts the AC power input via the plug 6 and the mechanical switch 11 into DC power and outputs the power. As a result, the power storage device 15 is charged. When the charging of the power storage device 15 is completed, the power supply control device 4 stops the standby power supply 14 again. While the mode of the load circuit 2 is the second mode, the power control unit 4 repeatedly starts and stops the standby power supply 14. That is, the power control device 4 intermittently activates the standby power supply 14.
When the light receiving circuit 18 receives the power on signal from the remote controller 20, or when the EPG data receiving circuit 19 receives the EPG data, the power control device 4 receives the power on signal from the light receiving circuit 18 or the EPG data receiving circuit 19 The main power switch 12 is turned on and the standby power supply 14 is started in response to the start signal from.
The standby power supply 14 may be configured to be started and stopped by the power supply control device 4. Therefore, the configuration of the standby power supply 14 is not particularly limited. The standby power supply 14 is composed of, for example, a switching power supply.
FIG. 3 is a circuit diagram showing a configuration example of the standby power supply 14 shown in FIG. With reference to FIG. 3, the standby power supply 14 includes a rectifier circuit 21, a smoothing capacitor 22, a transformer 23, a MOSFET 24, a gate control circuit 25, a diode 26, a smoothing capacitor 27, a photocoupler 28, and a Zener. It is equipped with a diode 29. The rectifier circuit 21 rectifies the AC voltage supplied from the commercial power supply via the plug 6. The smoothing capacitor 22 smoothes the fluctuation component of the DC voltage output from the rectifier circuit 21.
The transformer 23 includes a primary winding 23A and a secondary winding 23B. A DC voltage smoothed by the smoothing capacitor 22 is input to one end of the primary winding 23A. The MOSFET 24 is connected between the other end of the primary winding 23A of the transformer 23 and the ground node. The gate control circuit 25 controls the switching operation of the MOSFET 24 by controlling the gate voltage of the MOSFET 24.
The gate control circuit 25 outputs a signal for controlling the switching operation of the MOSFET 24. For example, the gate control circuit 25 generates a pulse signal according to a PWM (pulse width modulation) method and outputs the pulse signal to the gate of the MOSFET 24. The MOSFET 24 turns on and off in response to a signal from the gate control circuit 25. As a result, an AC voltage is generated in the secondary winding 23B of the transformer 23. This voltage is rectified by the diode 26 and smoothed by the smoothing capacitor 27. As a result, the standby power supply 14 outputs the voltage VN from the node N. A power storage device 15 and a power supply control device 4 are connected to the node N. The voltage VN is supplied to the power storage device 15 and the power supply control device 4, and is also supplied to other circuits such as the start signal generation circuit 5.
The photocoupler 28 operates by the voltage on the secondary side of the transformer 23. The photocoupler 28 constitutes a feedback circuit that provides a feedback signal from the secondary side of the transformer 23 to the primary side of the transformer 23. The cathode of diode 26 is connected to the anode of light emitting diode 28A. The cathode of the light emitting diode 28A is grounded via the Zener diode 29. The collector of the phototransistor 28B is connected to the gate control circuit 25. The emitter of the phototransistor 28B is grounded.
When the voltage VN rises above the predetermined voltage determined by the Zener diode 29, the light emitting diode 28A is turned on. When the light emitting diode 28A is turned on, light is emitted from the light emitting diode 28A. The phototransistor 28B is turned on in response to the light emitted by the light emitting diode 28A. When the phototransistor 28B is turned on, the gate control circuit 25 operates to lower the voltage VN. For example, the gate control circuit 25 reduces the frequency of the signal supplied to the gate of the MOSFET 24. Alternatively, the gate control circuit 25 shortens the ON period of the MOSFET 24.
On the other hand, when the VN decreases, the light emitting diode 28A stops emitting light. When the light emitting diode 28A stops emitting light, the phototransistor 28B is turned off. In this case, the gate control circuit 25 operates to increase the voltage VN. For example, the gate control circuit 25 controls the MOSFET 24 so that the switching frequency of the MOSFET 24 becomes large. By the above control, the voltage VN is kept almost constant.
When the standby power supply 14 is always in operation (for example, when power is constantly supplied to the standby circuit included in the load circuit 2), the loss of the standby power supply 14 is constantly generated. Specifically, as shown in FIG. 4, a current having a current value of A flows constantly in the standby power supply 14.
FIG. 5 is a diagram for explaining the effect of the embodiment of the present invention. With reference to FIG. 5, in the embodiment of the present invention, the standby power supply 14 is basically stopped in a state where the load circuit 2 does not require the supply of power from the power supply 3 (second mode). The standby power supply 14 is activated only for charging the power storage device 15. Therefore, the standby power supply 14 is started intermittently.
For example, as shown in FIG. 5, the standby power supply 14 is activated at times t1 and t2. The period tc is the period from the time t1 to the time t2, and indicates the activation cycle of the standby power supply 14. Time ton indicates the operating time per startup of the standby power supply 14. According to the present embodiment, for example, although the current value is A only during the time ton, the time-averaged current value is significantly smaller than the current value A. Therefore, according to the present embodiment, the loss of the standby power supply 14 can be reduced.
Further, in the second mode, since the main power switch 12 is off, no loss occurs in the main power 13. Therefore, in the second mode of the load circuit 2, the loss of the power supply 3 can be reduced.
The power supply control device 4 according to the present embodiment can be realized by a semiconductor integrated circuit. FIG. 6 is a block diagram showing a configuration of the power supply control device 4 according to the present embodiment.
With reference to FIG. 6, the power supply control device 4 includes a signal reception unit 31, a determination unit 32, an oscillation circuit (OSC) 33, a reference voltage generation circuit 34, a comparator 35, a control unit 36, and an overcurrent. It includes a detector 37, an overvoltage detector 38, an undervoltage detector 39, and a protection circuit 40.
The signal receiving unit 31 receives the power-on signal transmitted from the remote controller 20 to the light receiving circuit 18 from the light receiving circuit 18. The signal receiving unit 31 transmits a signal indicating that the power-on signal has been received to the determination unit 32. The determination unit 32 determines that the mode of the load circuit 2 has changed from the standby mode to the normal operation mode based on the signal from the signal reception unit 31. On the other hand, when the mode of the load circuit 2 changes from the normal operation mode to the standby mode, the load circuit 2 outputs a signal indicating the change to the determination unit 32. The determination unit 32 determines that the mode of the load circuit 2 has changed from the normal operation mode to the standby mode in response to the signal from the load circuit 2. The determination unit 32 sends a signal indicating the determination result to the control unit 36.
The oscillating circuit 33 supplies, for example, a signal receiving unit 31 and a determination unit 32 with control signals for controlling their operations. The signal from the oscillation circuit 33 may be supplied not only to the signal receiving unit 31 and the determination unit 32 but also to other circuits such as the control unit 36.
The reference voltage generation circuit 34 generates reference voltages Vref1, Vref2, Vref3, and Vref4 based on the voltage VN output from the node N. For example, the reference voltage generation circuit 34 is composed of a bandgap circuit. The reference voltage generating circuit 34 may generate the reference voltages Vref1 to Vref4 individually, or may generate the reference voltages Vref1 to Vref4 by dividing a certain reference voltage by the resistance voltage dividing circuit.
The comparator 35 compares the voltage VN with the reference voltage Vref1 and outputs the comparison result to the control unit 36. When the voltage VN is larger than the reference voltage Vref1, the comparator 35 outputs an H (high) level signal to the control unit 36. On the other hand, when the voltage VN drops below the reference voltage Vref1, the comparator 35 outputs an L (low) level signal. The value of the reference voltage Vref1 corresponds to the lower limit of the operating voltage range of the power supply controller 4.
The overcurrent detector 37 generates a voltage proportional to the current Iout output from the standby power supply 14, and compares the voltage with the reference voltage Vref2. When the voltage proportional to the current Iout becomes larger than the reference voltage Vref2, the overcurrent detector 37 outputs an H level signal to the protection circuit 40.
The overvoltage detector 38 compares the voltage VN with the reference voltage Vref3 and outputs the comparison result to the protection circuit 40. When the voltage VN is larger than the reference voltage Vref3, the overvoltage detector 38 outputs an H level signal to the protection circuit 40.
The low voltage detector 39 compares the voltage VN with the reference voltage Vref4, and outputs the comparison result to the protection circuit 40. When the voltage VN drops below the reference voltage Vref 4, the low voltage detector 39 outputs an H level signal to the protection circuit 40.
The control unit 36 controls the start / stop of the main power switch 12 and the standby power supply 14. When the determination unit 32 determines that the mode of the load circuit 2 has changed from the standby mode to the normal operation mode, the control unit 36 sends a signal ENm to the main power switch 12 to turn on the main power switch 12. Further, the control unit 36 sends signals ENs to the standby power supply 14. The gate control circuit 25 (see FIG. 3) included in the standby power supply 14 starts switching control of the MOSFET 24 in response to the signal ENs. This activates power supply 3.
When the determination unit 32 determines that the mode of the load circuit 2 has changed from the normal operation mode to the standby mode, the control unit 36 transmits a signal ENm for turning off the main power switch 12 to the main power switch 12. , Sends signals ENs to stop the standby power supply 14 to the standby power supply 14. The main power switch 12 is turned off according to the signal ENm, and the gate control circuit 25 included in the standby power supply 14 is stopped by the signal ENs.
Further, the control unit 36 transmits signals ENs to the standby power supply 14 in order to activate the standby power supply 14 in response to the H level signal sent from the comparator 35. The gate control circuit 25 starts switching control of the MOSFET 24 according to the signal ENs. When the standby power supply 14 is activated, the capacitor as the power storage device 15 is charged. When the charging of the capacitor is completed, the control unit 36 transmits signals ENs to the standby power supply 14 in order to stop the standby power supply 14.
If an abnormality occurs in the standby power supply 14, or if an abnormality occurs in the capacitor, for example, Iout becomes excessive. Alternatively, the voltage VN becomes too large or too small. If the Iout is excessive, the overcurrent detector 37 outputs an H level signal. Similarly, if the voltage VN is excessive, the overvoltage detector 38 outputs an H level signal, and if the voltage VN is too small, the undervoltage detector 39 outputs an H level signal. When the protection circuit 40 outputs an H level signal from at least one of the overcurrent detector 37, the overvoltage detector 38, and the undervoltage detector 39, the protection circuit 40 notifies the control unit 36 of an abnormality in the power supply system. The indicated signal is sent to the control unit 36. The control unit 36 sends a signal ENm for controlling the main power switch 12 to the main power switch 12 in response to this signal. Further, the protection circuit 40 stops the operation of the power supply control device 4.
For example, the control unit 36 sends a signal ENm for turning off the main power switch 12 to the main power switch 12 in response to the signal from the protection circuit 40. In this case, since the load circuit 2 and the power supply system 1 are stopped, the electronic device 100 can be protected. The control unit 36 may transmit a signal ENm for turning on the main power switch 12 to the main power switch 12. In this case, even if an abnormality occurs in the standby power supply system, the function of the load circuit 2 which is the main body of the electronic device 100 can be maintained.
FIG. 7 is a waveform diagram showing the operation of the power supply control device 4 having the configuration shown in FIG. With reference to FIGS. 7 and 6, the voltage VN is controlled to be greater than the reference voltage Vref1 and below the voltage Vfl. Preferably, the voltage VN is controlled to be less than the voltage Vfl. Here, the voltage Vfl corresponds to the voltage VN in the fully charged state of the capacitor.
Since the power control device 4 consumes the power stored in the capacitor, the voltage VN gradually decreases. When the voltage VN reaches the reference voltage Vref1, the lower limit of the operating voltage range, the power controller 4 changes the level of the signal ENs from L level to H level. As a result, the current Iout is output from the standby power supply 14. When the current Iout is output from the standby power supply 14, the capacitor is charged and the voltage VN rises.
During the time ton, the current Iout flows. After a lapse of time tons, the power controller 4 changes the level of the signal ENs from H level to L level. As a result, the standby power supply 14 is stopped and the charging of the capacitor is completed. After that, when the voltage VN reaches the reference voltage Vref1, the power supply controller 4 changes the level of the signal ENs from the L level to the H level again.
In the present embodiment, the time ton, which is the operating time of the standby power supply 14, is constant. For example, the control unit 36 has a timer function and measures the time ton. The time ton is predetermined based on the efficiency of the standby power supply 14, as described below.
FIG. 8 is a diagram showing the relationship between the startup time (time ton) of the standby power supply 14 and the loss of the standby power supply 14. With reference to FIG. 8, the loss of the standby power supply 14 increases monotonically with respect to time tons. For example, the loss of the standby power supply 14 is proportional to the time ton.
Assuming that the current Iout is constant, the time change rate of the capacitor voltage (that is, voltage VN) is large at the start of charging the capacitor, but gradually decreases. Although the voltage of the capacitor approaches the voltage Vfl, when the capacitor is almost fully charged, the voltage of the capacitor hardly changes even if the charging time is lengthened. On the other hand, increasing the charging time increases the loss of the standby power supply.
FIG. 9 is a diagram showing the relationship between the startup time (time ton) of the standby power supply 14 and the number of startup times of the standby power supply 14 per unit time. With reference to FIG. 9, the shorter the time ton, the shorter the charging time of the capacitor. When the charging time of the capacitor is short, the electric power stored in the capacitor is small. Therefore, the number of times the standby power supply 14 is started per unit time increases.
Since the discharge time of the capacitor is shortened by increasing the number of times the standby power supply 14 is started, the stop period of the standby power supply 14 is shortened. Therefore, the amount of reduction in the loss of the standby power supply 14 becomes small.
As shown in FIGS. 8 and 9, there is a trade-off between the loss of the standby power supply 14 and the number of times the standby power supply 14 is started. Therefore, as shown in FIG. 10, the efficiency of the standby power supply 14 is maximized at ton = ta. The maximum efficiency of the standby power supply 14 means that the amount of reduction in loss due to the stoppage of the standby power supply 14 is the maximum.
When the time ton is longer than the time ta, the loss of the standby power supply 14 increases due to the longer charging time of the capacitor. Further, the reduction amount of the loss of the standby power supply 14 is reduced by shortening the stop period of the standby power supply 14. Therefore, the efficiency of the standby power supply 14 is reduced.
On the other hand, when the time ton is shorter than the time ta, the loss per startup of the standby power supply 14 is reduced, but the reduction amount of the loss of the standby power supply 14 is reduced by increasing the number of startups of the standby power supply 14. To do. Therefore, the efficiency of the standby power supply 14 is reduced.
The time ton may be variable. Further, the control unit 36 may control the activation cycle (length of the period tc) of the standby power supply 14 based on the past history. For example, when the ambient temperature of the capacitor is high, the amount of decrease in the electric charge stored in the capacitor is larger than when the ambient temperature of the capacitor is low. Therefore, the control unit 36 may learn the time interval of charging the capacitor and change the length of time ton or the length of time tc based on the learning result.
In the above-described embodiment, the power storage device 15 and the power supply control device 4 are configured so that power is supplied only from the standby power supply 14. However, the configuration of the power supply system according to the present embodiment is not limited in this way. For example, as shown in FIG. 11, the power supply system 1 may include a power supply device 50 for supplying electric power to the power storage device 15 and the power supply control device 4.
The configuration of the power supply device 50 is not particularly limited as long as it is possible to supply electric power to the power storage device 15 and the power supply control device 4. The power supply device 50 is, for example, a power generation device such as a solar cell, a power storage device such as a battery or a capacitor, or a device for receiving power from a device other than the electronic device 100 such as a USB (Universal Serial Bus) interface circuit. is there. When the power supply device 50 is in a state where power can be supplied to the power supply control device 4, the power supply control device 4 does not need to start the standby power supply 14 intermittently. Therefore, the loss of the power supply system while the load circuit 2 is in the standby mode can be further reduced.
As described above, according to the present embodiment, the mode of the load circuit is switched from the mode in which the power supply from the power supply is required to the mode in which the power supply from the power supply is not required. If so, turn off the power. This can reduce the loss of the power supply.
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
1 power supply system, 2 load circuit, 3 power supply, 4 power supply controller, 5 start signal generation circuit, 6 plug, 7 AC / DC converter, 11 mechanical switch, 12 main power supply switch, 13 main power supply, 14 standby power supply, 15 Power storage device, 18 light receiving circuit, 19 EPG data receiving circuit, 20 remote control, 21 rectifier circuit, 22,27 smoothing capacitor, 23 transformer, 23A primary winding, 23B secondary winding, 24 MOSFET, 25 gate control circuit, 26 diode , 28 Optocoupler, 28A light emitting diode, 28B phototransistor, 29 Zener diode, 31 signal receiver, 32 judgment unit, 33 oscillation circuit, 34 reference voltage generation circuit, 35 comparator, 36 control unit, 37 overcurrent detector, 38 Overvoltage detector, 39 undervoltage detector, 40 protection circuit, 50 power supply, 100 electronics, N node.
14 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| JP2005295632A | Cites | Japan |
| JP2000341940A | Cites | Japan |
14 members in 6 offices
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 2009157811 | Japan | A | |
| JP20090157811 | – | – | – |
Members14
| Document | Office | Kind | |
|---|---|---|---|
| WO2011002062A1 | World Intellectual Property Organization (WIPO) | A1 | |
| JP2011015540A | Japan | A | |
| US2012092897A1 | United States of America | A1 | |
| EP2451066A1 | European Patent Office (EPO) | A1 | |
| CN102474188A | China | A | |
| KR20120093821A | Republic of Korea | A | |
| JP5116732B2This record | Japan | B2 | |
| US8854838B2 | United States of America | B2 | |
| EP2451066A4 | European Patent Office (EPO) | A4 | |
| US2015019894A1 | United States of America | A1 | |
| CN102474188B | China | B | |
| EP2451066B1 | European Patent Office (EPO) | B1 | |
| US9529418B2 | United States of America | B2 | |
| KR101772237B1 | Republic of Korea | B1 |
17 legal events, as the office reported them to INPADOC
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Numbers
- Publication
- 5116732
- Publication, DOCDB
- 5116732
- Publication, EPODOC
- JP5116732B
- Application
- 157811
- Application, DOCDB
- 2009157811
- Application, EPODOC
- JP20090157811
Titles2
- Japanese
- 電源制御装置、電源システムおよび電子機器
- English
- Power controller, power system and electronics
Classification
- CPC, 6
- H02J9/005
- G06F1/3293
- H02M2001/0032
- Y02B70/10
- Y02B70/30
- Y04S20/20
- IPC, 1
- H02M3 28
