Power unit

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a power supply unit having a built-in secondary battery and an AC adapter, which is suitable for use as, for example, a power supply for a portable personal computer and a charger for a mobile phone.

【0002】

[Conventional technology]

Recently, with the development of liquid crystal technology, various portable personal computers that are lightweight, compact, and highly mobile have been proposed. For example, in terms of size, A4 or B5 size computers are generally popular. doing. In addition, with the development of electronic image technology, many compact digital cameras and integrated VTRs have been put into practical use. These camera devices are easy to use in terms of ease of image processing and ease of reproduction processing, and are becoming generally preferred in combination with the widespread use of personal computers. Furthermore, with the development of communication technology and the enhancement of communication services, mobile phones have become widespread and common in homes. In addition, mobile information terminals called PDAs (Personal Digital Assistants) have also been put into practical use. This mobile information terminal has, for example, a telephone function using a digital wireless telephone system called PHS (Personal Handy Phone System), a communication function with a personal computer, a facsimile, etc., and a function called an electronic notebook. It is a versatile one with the above, and its size is said to be about the size of a palm.

【0003】

In these portable electronic devices, a secondary battery that can be reused by charging is usually used from the viewpoint of economy and the like, and when the portable electronic device is used, a battery composed of a plurality of secondary batteries connected in series. The unit is a DC power supply, and the internal electronic circuit is driven by the battery output.

【0004】

When charging In portable personal computers and personal digital assistants, since the charging circuit for the secondary battery is integrally provided on the main body side, it is only necessary to prepare an AC adapter. In other words, when using it indoors with a commercial power supply, etc., the AC adapter converts AC 100V to a predetermined DC voltage, and the output drives the internal electronic circuit and the secondary battery is used as the power supply line. The secondary battery is charged by disconnecting it from the top and operating the charging circuit.

【0005】

On the other hand, in mobile phones and digital cameras equipped with a DC / DC converter that stabilizes the output voltage of the secondary battery, the secondary battery charging circuit is not provided integrally on the main body side. The relationship between the battery and the main unit is inseparable, and a dedicated charger is required. These dedicated chargers are composed of an AC adapter, a charging circuit, etc., and when not carried, the main body or battery unit is attached to the dedicated charger to charge the secondary battery.

【0006】

[Problems to be Solved by the Invention]

However, in the above-mentioned portable personal computers and personal digital assistants, the functions are minimized because mobility is prioritized, and the battery capacity is limited by its size and may not be sufficient depending on the usage environment. It has a problem that occurs. In addition, when a plurality of portable electronic devices are used in combination, such as capturing an image taken by a digital camera into a personal computer and transmitting the image information to another location by a mobile phone, a plurality of electronic devices to be used. In addition to managing the remaining battery level by the user himself, if the battery does not have a built-in charger, it is necessary to prepare a dedicated charger for each, which is inefficient in terms of cost and space. In addition, there is a problem that it is not easy to use. Therefore, there is a demand for a versatile power supply unit that can be used in various usage environments.

【0007】

Therefore, an object of the present invention is to secure a sufficient battery capacity and to provide an easy-to-use power supply unit capable of responding to various usage environments according to a user's request.

【0008】

[Means for solving problems]

In order to solve the above problems, the invention of claim 1 includes a power supply circuit that forms a first power supply voltage from a commercial power supply, a battery unit composed of one or a plurality of secondary batteries, and a charging circuit of the battery unit. , A power supply unit including a first output terminal from which a first power supply voltage is taken out and a second output terminal from which a second power supply voltage formed from the first power supply voltage is taken out. ..

【0009】

According to the third aspect of the present invention, in a power supply unit that supplies an output voltage to an electronic device by interposing between a commercial power supply and an electronic device having a secondary battery inside, the electronic device requires a voltage of the commercial power supply. A first power supply circuit that forms a stabilized first power supply voltage, a battery unit consisting of one or more secondary batteries, and a regulated predetermined DC voltage required by an electronic device for the voltage of the battery unit. When the voltage of the commercial power supply is supplied to the second power supply circuit that converts to voltage and the first power supply circuit, the output voltage of the first power supply circuit is supplied to the electronic device, and the commercial power supply is supplied to the first power supply circuit. The power supply unit is characterized by having a supply means for supplying the output voltage of the second power supply circuit to an electronic device when the voltage of the above is not supplied.

【0010】

In the present invention, the AC / DC switching power supply circuit forms a first power supply voltage from the commercial power supply, and the formed first power supply voltage is supplied from the first output terminal to the personal computer, and the first power supply voltage is supplied. The second power supply voltage formed from is supplied to the mobile phone, and the first power supply voltage is supplied to the battery unit via the charging circuit, and the battery unit is charged.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a case where a personal computer 10 is driven as an example of a case where an electronic device is driven by a power supply unit 1 according to an embodiment of the present invention. A personal computer 10 can be mounted on the power supply unit 1. In this state, power is supplied to the personal computer 10 by pulling out the connection cord 3 housed in the bottom surface of the power supply unit 1 and connecting the power to the personal computer 10. On the other hand, power is supplied to the power supply unit 1 by connecting a commercial power supply to an AC inlet arranged on the side surface of the power supply unit 1 (not shown) by an AC cord 2. Further, although not shown, an LED for displaying the capacity of the battery is arranged on the side surface of the power supply unit 1, and the remaining battery level can be checked while using the personal computer 10.

【0012】

Further, as an example, this power supply unit 1 has substantially the same external dimensions as a personal computer, and the built-in battery can drive the personal computer for a long time, and the AC adapter of the personal computer is built-in and carried. It has a built-in charging function that can charge the phone.

【0013】

FIG. 2A is a top view showing the appearance of an embodiment of the present invention, and FIG. 2B is a bottom view showing the appearance of an embodiment of the present invention. First, the structural part of one embodiment of the present invention will be described with reference to FIGS. 2A and 2B.

【0014】

In FIGS. 2A and 2B, it is the main body case of the power supply unit 1. As described above, the main body case has substantially the same external dimensions as, for example, a B5 size personal computer, and specifically, the length (200) × width (256) × height (18) mm. There is.

【0015】

Further, the main body case has a space 5 for storing the power supply board, a space 6 for storing the control board, and spaces 7a and 7b for storing the battery unit 14 described later in two. In addition, various electronic components constituting the AC / DC switching power supply circuit 11, two DC / DC switching power supply circuits 12, 13, the charging circuit 15, the switch circuit 16, etc., which will be described later, are mounted on the power supply board, and the control board is mounted. Various electronic components constituting the control unit 20, which will be described later, are mounted on the vehicle. These power supply boards, control boards, and battery units are electrically connected to each other at necessary locations by connecting members.

【0016】

An AC inlet 2c is arranged at the end of one side surface of the main body case, and an AC cord 2 is connected to the AC inlet 2c (not shown). Therefore, the power supply voltage of the commercial power supply of AC100V is drawn into the power supply unit via the AC cord 2 and the AC inlet 2c.

【0017】

An operation panel having a power switch, a display LED, and the like is arranged in the center of one side surface of the main body case (not shown). Further, as shown in FIG. 2B, a connection cord 4 for a mobile phone is attached from approximately the center of the bottom surface of the main body case to the end on one side surface side. The connection cord 4 has a connector 4a at one end and a plug 4b at the other end. The connector 4a and the connector 4c on the main body case side, which will be described later, are connected. A recess 9 corresponding to the shape of the connection cord 4 is formed on the bottom surface of the main body case, and when not in use, the connection cord 4 is housed in the recess 9 as shown by a solid line in the figure. When in use, the plug 4b is freely pulled out from the central portion of the connection cord 4 as shown by the dotted line in the figure, and is connected to the mobile phone in this state.

【0018】

On the other hand, as shown in FIG. 2B, a connection cord 3 for a personal computer is attached from approximately the center of the bottom surface of the main body case to the other side surface. The connection cord 3 has a connector 3a at one end and a plug 3b at the other end, as shown in FIG. 2B. The connector 3a and the connector 3c on the main body case side, which will be described later, are connected. A recess 8 corresponding to the shape of the connection cord 3 is formed on the bottom surface of the main body case, and half of the connection cord 3 on the connector 3a side is stored in this recess 8, and the connection cord 3 on the remaining plug 3b side is stored in this recess 8. When not in use, it is locked along the other side of the body case. When in use, the plug 3b portion is freely pulled out from the central portion of the connection cord 3 as shown by the dotted line in the figure, and is connected to the personal computer in this state.

【0019】

That is, when the personal computer is driven by the electric power on the power supply unit side, the personal computer is placed on the power supply unit, and the power supply unit and the personal computer are electrically connected by the connection cord 3 in that state. Then, the electronic circuit inside the personal computer is driven by supplying electric power on the power supply unit side to operate the keyboard. In parallel with this, it is possible to electrically connect the power supply unit and the mobile phone with the connection cord 4 as needed, and charge the secondary battery of the mobile phone with the power of the power supply unit side. It is said that.

【0020】

FIG. 3 shows the operating state of the power supply unit 1 in each of the charging mode ST1, the standby mode ST2, the personal computer output mode ST3, and the mobile phone output mode ST4. Standby mode ST2 is when the following three states are satisfied. That is, 1. The power switch is off, 2. There is no commercial power input or the battery is fully charged. 3. There is no mobile phone connection, Is. In standby mode, there is no power supply to personal computers and mobile phones.

【0021】

The charging mode ST1 is a case where the following two conditions are satisfied. That is, 1. The power switch is off, 2. There is a commercial power input, Is. In the charging mode, charging is started by connecting the commercial power supply and the power supply unit with the AC cord 2 while the power switch is off.

【0022】

Personal computer output mode ST3 is when the condition that the power switch is on is satisfied, and this mode is battery-powered ST mode 3a when there is no commercial power input and AC drive when there is commercial power input. It can be divided into two modes, mode ST3b. In the battery-powered mode mode ST3a, the personal computer and the power supply unit 1 are connected by the connection cord 3, and the power supply switch is turned on to start supplying power from the battery of the power supply unit 1 to the personal computer. On the other hand, in the AC drive mode ST3b, in addition to connecting to a personal computer, by connecting to a commercial power supply with AC cord 2 and turning on the power switch, from the commercial power supply via the AC adapter built into the power supply unit. Power supply to the personal computer is started.

【0023】

Mobile phone output mode ST4 is when the condition that the mobile phone is connected is satisfied, and this mode is also when there is battery-powered mode ST4a when there is no commercial power input and when there is commercial power input. AC drive mode ST4b can be divided into two modes. In the battery-powered mode ST4a, when the mobile phone and the power supply unit 1 are connected by the connection cord 4, power supply from the battery of the power supply unit to the mobile phone is started. On the other hand, in the AC drive mode ST4a, in addition to the connection of the mobile phone, by connecting the commercial power supply and the power supply unit 1 with the AC cord 2, it is possible to carry from the commercial power supply via the AC adapter built in the power supply unit 1. Power supply to the phone is started.

【0024】

Although not shown, the abnormal mode is the case of abnormal operation of the output voltage and / or the output current, or the case of a fuse blow. In this case, the LED provided on the main body is blinked to notify the user that the mode is abnormal.

【0025】

FIG. 4 shows the configuration of an internal circuit according to an embodiment of the present invention. The configuration of the circuit portion and its operation according to the embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same reference numerals are attached to the portions corresponding to those in FIG.

【0026】

As shown in FIG. 4, the internal circuits housed in the main body case are AC / DC switching power supply circuit 11, two DC / DC switching power supply circuits 12, 13, battery unit 14, charging circuit 15, and switch circuit 16. It is composed of a control unit 20 and a control unit 20.

【0027】

The power supply voltage from the commercial power supply is supplied to the AC / DC switching power supply circuit 11 via the power input terminals 51 and 52 of the AC inlet 2c. The AC / DC switching power supply circuit 11 stabilizes the input AC voltage of AC100V to a DC voltage of either 16V or 17V and outputs it in response to the control signal from the control unit 20. The output voltage formed in the AC / DC switching power supply circuit 11 is supplied to each part of the DC / DC switching power supply circuit 13, the input terminal of the switch circuit 16, and the charging circuit 15. The input voltage range of the AC / DC switching power supply circuit 11 is, for example, AC90V to AC276V, and the output capacitance is 2.5A. Further, the AC / DC switching power supply circuit 11 generates a signal indicating operation / non-operation and supplies the signal to the control unit 20.

【0028】

The battery unit 14 is, for example, a combination of a plurality of lithium ion batteries. Specifically, the battery unit 14 is arranged in so-called 3 parallel 4 series, in which three lithium ion batteries are connected in parallel and one set of lithium ion batteries connected in parallel is connected in series. There are a total of 12 lithium-ion batteries. An output voltage corresponding to the discharge characteristics is obtained from the battery unit 14, and this output voltage is supplied to the DC / DC switching power supply circuit 12 and the control unit 20. As for the charge / discharge regulation voltage of the lithium ion battery, for example, it is assumed that the upper limit voltage at the time of charging is 4.2V and the lower limit voltage at the time of discharging is 2.5V.

【0029】

The DC / DC switching power supply circuit 12 stabilizes the output voltage of the battery unit 14 to a DC voltage of 16V and outputs it in response to a control signal from the control unit 20. The output voltage formed in the DC / DC switching power supply circuit 12 is supplied to each part of the DC / DC switching power supply circuit 13, the input terminal of the switch circuit 16, and the charging circuit 15. The output capacity of the DC / DC switching power supply circuit 12 is 2.5A. Further, the AC / DC switching power supply circuit 12 generates a signal indicating operation / non-operation and supplies it to the control unit 20.

【0030】

The terminal 53 of the connector 3c is connected to the output terminal of the switch circuit 16, and the terminal 54 of the connector 3c is grounded. The switch circuit 16 is turned on in response to a control signal from the control unit 20. Therefore, the output voltage of the AC / DC switching power supply circuit 11 or the output voltage of the DC / DC switching power supply circuit 12 is taken out via the terminals 53 and 54 of the connector 3c. Further, the switch circuit 16 has a function of detecting whether or not a personal computer is connected to the connector 3c as a load, and supplies this detection signal to the control unit 20.

【0031】

The DC / DC switching power supply circuit 13 stabilizes the output voltage of the AC / DC switching power supply circuit 11 or the output voltage of the DC / DC switching power supply circuit 12 to a DC voltage of 5V according to the control signal from the control unit 20. And output. The output voltage formed in the DC / DC switching power supply circuit 13 is taken out via the terminals 55 and 56 of the connector 4c. The output capacity of the DC / DC switching power supply circuit 13 is 0.5A. Further, the DC / DC switching power supply circuit 13 generates a signal indicating operation / non-operation and supplies the signal to the control unit 20.

【0032】

The charging circuit 15 charges the battery unit 14 in response to a control signal from the control unit 20. In this embodiment, the battery unit 14 can be charged in about 3 hours.

【0033】

The control unit 20 that controls each of the above-described units is mainly composed of a microcomputer, and has a peripheral circuit group related to input / output with each circuit and a circuit group related to protection operation in addition to the microcomputer. The control unit 20 monitors the operation signal / non-operation signal from each unit, the detection signal, and the output voltage of the battery unit 14, generates a control signal according to each state, and supplies this control signal to each unit. Centrally manage the entire power supply unit.

【0034】

For example, when the AC cord 2 is connected to the AC inlet 2c and a commercial power supply voltage is supplied to the AC / DC switching power supply circuit 11, the control unit 20 is based on the signal from the AC / DC switching power supply circuit 11. A control signal for deactivating the DC / DC switching power supply circuit 12 is generated, and this control signal is supplied to the DC / DC switching power supply circuit 12. Therefore, the DC / DC switching power supply circuit 12 is in a non-operating state.

【0035】

FIG. 5 schematically shows the above-mentioned state. In FIG. 5, the same reference numerals are attached to the portions corresponding to those in FIG. That is, by deactivating the DC / DC switching power supply circuit 12 by the control signal from the control unit 20, it has the same function as the switch circuit 17. When the commercial power supply voltage is supplied in this way, the output voltage of the AC / DC switching power supply circuit 11 is used to avoid wasting the power of the battery unit 14 and prevent the battery unit from being consumed. On the contrary, the output line of the AC / DC switching power supply circuit 11 and the output line of the DC / DC switching power supply circuit 12 are common without directly controlling the AC / DC switching power supply circuit 11 and the DC / DC switching power supply circuit 12. A switch circuit 17 may be provided at a connection point (indicated by s in FIG. 4), and the switch circuit 17 may be controlled by the control unit 20.

【0036】

In this state where the control unit 20 utilizes the output voltage of the AC / DC switching power supply circuit 11 described above, the control unit 20 receives the detection signal from the switch circuit 16 and the operation signal / non-operation signal from the DC / DC switching power supply circuit 13. A control signal is generated based on the output voltage of the battery unit 14 and a detection signal indicating the state of the power switch (not shown). Specifically, if the load is not connected to any of the connectors 3c and 4c, the power switch is off, and the output voltage of the battery unit 14 does not reach the upper limit voltage, constant current charging is performed. The control signal is generated in the control unit 20, and this control signal is supplied to the charging circuit 15 and also to the AC / DC switching power supply circuit 11.

【0037】

Therefore, in this case, the output voltage of the AC / DC switching power supply circuit 11 is switched, and the battery unit 14 is charged with a constant current using the output voltage of 17V from the AC / DC switching power supply circuit 11. Be done. Then, when it is detected that the output voltage of the battery unit 14 has reached the upper limit voltage, the control unit 20 generates a control signal for performing constant voltage charging, and this control signal is transmitted to the charging circuit 15. Be supplied. Therefore, in this case, the battery unit 14 is charged by a constant voltage using the output voltage of 17V from the AC / DC switching power supply circuit 11. At the same time, a control signal for switching the operation mode of the AC / DC switching power supply circuit 11 is generated in the control unit 20, and the AC / DC switching power supply circuit 11 is switched to the power saving mode.

【0038】

When the personal computer is connected to the connector 3c and the power switch is turned on, the control unit 15 generates a control signal for turning on the switch circuit 16 and a control signal for stopping the charging operation. Then, one control signal is supplied to the switch circuit 16 and the other control signal is supplied to the charging circuit 15. Therefore, in this case, the output voltage from the AC / DC switching power supply circuit 11 is supplied to the personal computer via the switch circuit 16 and the connector 3c in a state where charging is stopped.

【0039】

Further, when a mobile phone is connected to the connector 4c, the DC / DC switching power supply circuit 13 operates according to the output voltage of the AC / DC switching power supply circuit 11 regardless of the connection of the personal computer or the state of the power switch. , The output voltage of this DC / DC switching power supply circuit 13 is supplied to the mobile phone via the connector 4c. Therefore, in the mobile phone, the secondary battery is charged.

【0040】

On the other hand, when the commercial power supply voltage is not supplied to the AC / DC switching power supply circuit 11, the control unit 20 puts the DC / DC switching power supply circuit 12 into the operating state based on the signal from the AC / DC switching power supply circuit 11. A control signal is generated, and this control signal is supplied to the DC / DC switching power supply circuit 12. Therefore, the DC / DC switching power supply circuit 12 is in the operating state.

【0041】

In the control unit 20, the DC / DC switching power supply circuit 12 described above is in the operating state, and in this state in which the power of the battery unit 14 is used, the detection signal from the switch circuit 16 and the DC / DC switching power supply circuit 13 are used. A control signal is generated based on an operation signal, an output voltage of the battery unit 14, and a detection signal indicating the state of a power switch (not shown). Specifically, when the output voltage of the battery unit 14 reaches the lower limit voltage, a control signal for turning off the switch circuit 16 is generated in the control unit 20 regardless of other signals, and DC / A control signal is generated that deactivates the DC switching power supply circuit 12. Therefore, in this case, even if the personal computer is connected to the connector 3c or the mobile phone is connected to the connector 4c, the output voltage is never supplied from the power supply unit side.

【0042】

Further, when the output voltage of the battery unit 14 has not reached the lower limit voltage, a personal computer is connected to the connector 3c, and the power switch is turned on, a control signal for turning on the switch circuit 16 is output. It is generated in the control unit 15 and this control signal is supplied to the switch circuit 16. Therefore, in this case, the output voltage generated in the DC / DC switching power supply circuit 12 by the electric power of the battery unit 14 is supplied to the personal computer via the switch circuit 16 and the connector 3c.

【0043】

Further, when the output voltage of the battery unit 14 has not reached the lower limit voltage and the mobile phone is connected to the connector 4c, the battery unit 14 is connected regardless of the connection of the personal computer or the state of the power switch. The DC / DC switching power supply circuit 13 operates by the output voltage generated in the DC / DC switching power supply circuit 12 by electric power, and the output voltage of the DC / DC switching power supply circuit 13 is supplied to the mobile phone. Therefore, the secondary battery of the mobile phone is charged.

【0044】

FIG. 6 shows a specific example of the internal circuit according to the embodiment of the present invention described above. The configuration and operation of one embodiment will be described in more detail with reference to FIG. In FIG. 6, the same reference numerals are given to the parts corresponding to those in FIG. 5, and the description of the common parts will be omitted.

【0045】

As shown in FIG. 6, one end of the resistor 34 is located at the common connection point (indicated by s in FIG. 6) between the output line of the AC / DC switching power supply circuit 11 and the output line of the DC / DC switching power supply circuit 12. A switch circuit 38 is inserted between the other end of the resistor 34 and one output terminal 53 of the connector 3c, and resistors 32 and 33 connected in series with the switch circuit 38 are connected. Further, resistors 35 and 36 connected in series are inserted between the other end of the resistor 34 and the ground, and a switch circuit 26 is inserted between the other end of the resistor 34 and the + side of the battery unit 14. A pre-charging circuit 25 is connected in parallel with this switch circuit 28.

【0046】

Further, as shown in FIG. 6, the above-mentioned control unit 20 is composed of the microprocessor 21, peripheral circuits related to input / output with each circuit, and circuits related to protection operation. The microprocessor 21 has seven input terminals 21a, 21c, 21d, 21e, 21i, 21m, 21n and six output terminals 21b, 21f, 21g, 21h, 21j, 21k. Signals from each part are supplied to each of the seven input terminals 21a, 21c, 21d, 21e, 21i, 21m, and 21n.

【0047】

Specifically, a signal indicating that the commercial power supply voltage generated in the AC / DC switching power supply circuit 11 is supplied to the input terminal 21a is supplied via the diode 39. The operation signal / non-operation signal of the AC / DC switching power supply circuit 11 generated in the AC / DC switching power supply circuit 11 is supplied to the input terminal 21c via the operation signal generation circuit 24.

【0048】

The switch circuit 16 in FIG. 5 is composed of two resistors 32 and 33 and a switch circuit 38. The output voltage of the common connection point between the resistor 32 and the resistor 33 is supplied to the input terminal 21d. This output voltage detects whether or not a personal computer as a load is connected to the connector 3a.

【0049】

The resistor 34 is for detecting the output current of the AC / DC switching power supply circuit 11 or the DC / DC switching power supply circuit 12. The output voltage generated across the resistance value 34 is supplied to the current detection circuit 22. The current detection circuit 22 determines, for example, an overcurrent state when a current of 2.4 A or more flows through the resistor 34, and generates, for example, a high-level signal. This detection signal is supplied to the input terminal 21e. The microprocessor 21 forcibly stops the operation of each part in the case of an overcurrent state based on the detection signal supplied via the input terminal 21e.

【0050】

The output voltage of the battery unit 14 is supplied to the input terminal 21i. Further, the output voltage of the common connection point between the resistor 35 and the resistor 36 is supplied to the input terminal 21m. The output voltage of the AC / DC switching power supply circuit 11 or the DC / DC switching power supply circuit 12 is monitored by this output voltage. Further, the operation signal / non-operation signal generated in the DC / DC switching power supply circuit 13 is supplied to the input terminal 21n.

【0051】

As described above, the microprocessor 21 monitors each signal supplied to each of the seven input terminals 21a, 21c, 21d, 21e, 21i, 21m, and 21n, executes a determination process, and responds to each state. Generates a control signal. Each control signal generated by the microcomputer 21 is output from each of the six output terminals 21b, 21f, 21g, 21h, 21j, and 21k.

【0052】

Specifically, the output terminal 21b outputs a control signal for setting the AC / DC switching power supply circuit 11 to the power saving mode when the battery unit 14 is fully charged. This control signal is supplied to one input terminal of the power saving signal generation circuit 23. The output of the stop signal generation circuit 28 is supplied to the other input terminal of the power saving signal generation circuit 23. In the power saving signal generation circuit 23, a power saving signal is generated and supplied to the control terminal of the AC / DC switching power supply circuit 11.

【0053】

The pre-charging circuit 25, the switch circuit 26, and the switching signal generation circuit 27 constitute the charging circuit 15 in FIG. From the output terminals 21f and 21j, control signals for charging the battery unit 14 are output.

【0054】

For example, when the control signal from the output terminal 21f is controlled to a low level, a switching signal is generated in the switching circuit 27, and the output voltage of the AC / DC switching power supply circuit 11 is switched from 16V to 17V by this switching signal. At the same time, the pre-charging circuit starts operating, and the battery unit 14 is charged with a constant current. At this time, the switch circuit 26 is turned off because the control signal from the output terminal 21j is controlled at a high level.

【0055】

When the microcomputer 21 detects that the output voltage of the battery unit 14 has reached the upper limit voltage, the control signal from the output terminal 21f is controlled to a high level, and the operation of the precharging circuit 27 is stopped. , The control signal from the output terminal 21j is controlled to a low level, and the switch circuit 26 is turned on. At this time, since the low level control signal is supplied to the switching circuit 27 from the output terminal 21j, the output voltage of the AC / DC switching power supply circuit 11 is maintained at 17V, and the constant voltage is applied to the battery unit 14. It will be charged.

【0056】

From the output terminal 21g, a control signal which directly controls the operation / non-operation of the DC / DC switching power supply circuit 12 is output is power. Further, a control signal for controlling the switch circuit 38 is output from the output terminal 21k. Further, from the output terminal 21h, a control signal for stopping each of the AC / DC switching power supply circuit 11, the DC / DC switching power supply circuit 12, and the DC / DC switching power supply circuit 13 is output. The control signal from the output terminal 21h is supplied to each of the stop signal generation circuits 28, 29, and 31. The operation signal / non-operation signal of the AC / DC switching power supply circuit 11 is supplied to the stop signal generation circuit 29 via the operation signal generation circuit 24. The output of the stop signal generation circuit 29 is supplied to the DC / DC switching power supply circuit 12. Further, the output of the stop signal generation circuit 31 is supplied to the operation signal generation circuit 30. A signal from the mobile phone is supplied to the operation signal generation circuit 30 via the terminal 37. The output of the operation signal generation circuit 30 is supplied to the DC / DC switching power supply circuit 13.

【0057】

In one embodiment of the present invention described above, a case where a control signal is supplied to the AC / DC switching power supply circuits 11 and the DC / DC switching power supply circuits 12 and 13 to directly control the operation / non-operation is performed. As explained, by inserting a switch circuit into the input line or output line of each power supply circuit, controlling the switch circuit by control 20, and disconnecting each power supply circuit from the current path, the power from the specified part is used. It may be configured to do so.

【0058】

Further, in the above-described embodiment of the present invention, when the output voltage of the battery unit 14 does not reach the lower limit voltage and the mobile phone is connected to the connector 4c, a personal computer is connected or a power source is used. The case where the DC / DC switching power supply circuit 13 is operated by the output voltage generated in the DC / DC switching power supply circuit 12 by the power of the battery unit 14 regardless of the state of the switch has been described, but only the mobile phone is connected to the connector 4c. When connected, the output voltage of the battery unit 14 may be directly supplied to the DC / DC switching power supply circuit 13. For example, in the specific circuit shown in FIG. 6, the output voltage of the battery unit 14 can be directly supplied to the DC / DC switching power supply circuit 13. In this case, the switch circuit 26 is turned on and the DC / DC is DC / DC at the same time. Controls the switching power supply circuit 12 to be inoperable.

【0059】

Further, in the above-described embodiment of the present invention, the case where a plurality of lithium ion batteries are used for the battery unit 14 has been described, but a nickel-gadomium battery, a nickel-hydrogen battery, or the like may also be used.

【0060】

Further, in the above-described embodiment of the present invention, the case where the personal computer is connected to the connector 3c and the mobile phone is connected to the connector 4c has been described. However, the mobile information terminal is connected to the connector 3c and the connector 4c is connected to the mobile information terminal. A camera device such as a digital camera may be connected. In this case, connection cords 3 and 4 according to the connected device are used.

【0061】

FIG. 7 shows the configuration of a main part of another embodiment of the present invention. In FIG. 7, the same reference numerals are given to the parts corresponding to those in FIG. 5 described above, and the description of the common parts will be omitted. As shown in FIG. 7, in another embodiment of the present invention, the charging circuit 13 and the DC / DC switching power supply circuit 13 in one embodiment are not provided, and function as a power supply only for a personal computer.

【0062】

That is, when the AC cord 2 is connected to the AC inlet 2c and the commercial power supply voltage is supplied to the AC / DC switching power supply circuit 11, the control unit 20 is based on the signal from the AC / DC switching power supply circuit 11. A control signal that electrically disconnects the power supply pack 14 and the DC / DC switching power supply circuit 12 is generated, and this control signal is supplied to the switch circuit 18. Therefore, the output voltage of the AC / DC switching power supply circuit 11 is supplied to the personal computer while the DC / DC switching power supply circuit 12 is not operating.

【0063】

On the other hand, when the commercial power supply voltage is not supplied to the AC / DC switching power supply circuit 11, the control unit 20 sets the power supply pack 14 and the DC / DC switching power supply circuit 12 based on the signal from the AC / DC switching power supply circuit 11. A control signal for electrically connecting the two is generated, and this control signal is supplied to the switch circuit 18. Therefore, the DC / DC switching power supply circuit 12 operates by the output voltage of the power supply pack 14, and the output voltage formed in the DC / DC switching power supply circuit 12 is supplied to the personal computer.

【0064】

[Effect of the invention]

In the present invention, the power supply unit is provided with first and second voltage conversion means, a battery unit, and a supply means. Therefore, according to the present invention, it is possible to secure a sufficient battery capacity, and it is possible to cope with various usage environments according to the user's request, and it is possible to improve usability. The present invention is more effective when a plurality of portable electronic devices are used at the same time.

[Simple explanation of drawings]

[Figure 1]

It is an external view of one Embodiment to which this invention was applied.

[Figure 2]

It is an external view for demonstrating the structure of one Embodiment to which this invention is applied.

[Fig. 3]

It is a figure which shows the operation state of one Embodiment of this invention.

[Fig. 4]

It is a block diagram which shows the structure of the internal circuit in one Embodiment of this invention.

[Fig. 5]

It is a block diagram used for explaining one Embodiment of this invention.

[Fig. 6]

It is a block diagram which shows an example of the internal circuit in one Embodiment of this invention.

[Fig. 7]

It is a block diagram used for explaining another embodiment of this invention.

[Explanation of symbols]

1 Power supply unit, 2c AC inlet, 3 Connection cord for personal computer, 4 Connection cord for mobile phone, 11 AC / DC switching power supply circuit, 12, 13 DC / DC switching power supply circuit, 14 Battery unit, 15 Charging circuit, 16 Switch circuit, 20 Control unit