JP2001069682A - Power supply unit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure a sufficient battery capacity and to be able to cope with various use environments according to a user's request. An AC / DC switching power supply circuit, a battery pack, and a DC / DC switching power supply circuit are provided in a power supply unit. When a voltage from a commercial power supply is supplied to the AC / DC switching power supply circuit 11, the DC / DC switching power supply circuit 12 is controlled so as to be in an inactive state, and the output voltage of the AC / DC switching power supply circuit 11 is controlled. Output to the outside via the connector 3c and the connection cord 3. When a voltage from a commercial power supply is not supplied to the AC / DC switching power supply circuit 11, the DC / DC switching power supply circuit 12 is controlled to be in an operating state, and the DC / DC switching power supply circuit 12
The output voltage generated in the / DC switching power supply circuit 12 is output to the outside via the connector 3c and the connection cord 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply unit having a built-in secondary battery and an AC adapter, and suitable for use as, for example, a portable personal computer power supply and a portable telephone charger.

[0002]

2. Description of the Related Art In recent years, with the development of liquid crystal technology, various types of portable personal computers that are lightweight, compact and highly mobile have been proposed. Are commonly spread. Further, with the development of electronic imaging technology, many compact digital cameras, integrated VTRs and the like have been put into practical use. These camera devices are easy to use in terms of easiness of image processing and easiness of reproduction processing, and have been generally used favorably in conjunction with the spread of personal computers. Furthermore, with the development of communication technology and the enhancement of communication services, mobile phones have also become commonplace in households. PDA (Personal Digit)
al Assistants) are also in practical use. This portable information terminal is, for example, a PHS (Personal
It is a versatile device having a telephone function using a digital wireless telephone system called Handy Phone System, a communication function with a personal computer and a facsimile, and a function called a so-called electronic notebook. Is about the size of a palm.

In these portable electronic devices, a secondary battery which can be reused by being charged from the viewpoint of economy and the like is generally used. When the portable electronic device is used, a plurality of secondary batteries connected in series are used. Is configured as a DC power supply, and the internal electronic circuit is driven by the battery output.

In charging a portable personal computer or a portable information terminal, a charging circuit for a secondary battery is provided integrally with the main body, so that only an AC adapter is required. In other words, when used indoors or the like where a commercial power supply or the like is provided, the AC
V is converted to a predetermined DC voltage, the output of which drives the internal electronic circuit, and disconnects the secondary battery from the power supply line to operate the charging circuit to charge the secondary battery.

On the other hand, a charging circuit for a secondary battery is not provided integrally with the main body, but a portable telephone or a digital camera equipped with a DC / DC converter for stabilizing the output voltage of the secondary battery is used. In addition, the relationship between the secondary battery and the main body is inseparable, and a dedicated charger is required. These dedicated chargers are composed of an AC adapter, a charging circuit and the like, and charge the secondary battery by attaching the main body or the battery unit to the dedicated charger when not carrying.

[0006]

However, in the above-mentioned portable personal computer and portable information terminal, the functions are minimized to give priority to mobility, and the battery capacity is limited to the size. However, there is a problem that it may not be sufficient depending on the use environment. In the case where a plurality of portable electronic devices are used in combination, such as capturing an image captured by a digital camera into a personal computer and transmitting the image information to another place using a mobile phone, a plurality of electronic devices to be used are used. It is necessary to prepare a dedicated charger for each battery that does not have a built-in charger, as well as to manage the remaining battery power of the user himself, which is inefficient in terms of cost and space, In addition, there is a problem that the usability is poor. Therefore, a versatile power supply unit that can cope with various use environments is demanded.

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

[0008]

In order to solve the above problems, a first aspect of the present invention is a battery comprising a power supply circuit for forming a first power supply voltage from a commercial power supply and one or more secondary batteries. Unit, a charging circuit of the battery unit, a first output terminal from which the first power supply voltage is obtained, and a second output terminal from which the second power supply voltage formed from the first power supply voltage is obtained.
And a power supply unit.

According to a third aspect of the present invention, there is provided a power supply unit for supplying an output voltage to an electronic device via a commercial power supply and an electronic device having a secondary battery therein. A first power supply circuit for forming a stabilized first power supply voltage required by the device, a battery unit including one or more secondary batteries, and a stabilized voltage required by the electronic device for the battery unit; A second power supply circuit that converts the voltage into a predetermined DC voltage; and a first power supply circuit that supplies an output voltage of the first power supply circuit to an electronic device when a commercial power supply voltage is supplied to the first power supply circuit. And a supply unit for supplying the output voltage of the second power supply circuit to the electronic device when the voltage of the commercial power supply is not supplied to the power supply unit.

In the present invention, the AC / DC switching power supply circuit forms the 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. A second power supply voltage formed from the power supply voltage of
Further, the first power supply voltage is supplied to the battery unit via the charging circuit, and the battery unit is charged.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below 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 on the bottom surface of the power supply unit 1 and connecting it to the personal computer 10. On the other hand, the power supply to the power supply unit 1 is A
The connection is performed by connecting the AC power supply, which is not shown, to the AC inlet provided on the side surface of the power supply unit 1 and the commercial power supply by the C code 2. Although not shown, an LED for displaying the capacity of the battery is arranged on a side surface of the power supply unit 1.
You can check the battery level while using.

The power supply unit 1 has, for example, substantially the same external dimensions as a personal computer, allows a personal computer to be driven for a long time by a built-in battery, and has a built-in personal computer AC adapter. In addition, a charging function capable of charging a mobile phone is built in.

FIG. 2A is a top view showing the appearance of one embodiment of the present invention, and FIG. 2B is a bottom view showing the appearance of one embodiment of the present invention. First, FIG. 2A and FIG.
The structural part of one embodiment of the present invention will be described using B.

2A and 2B show a main body case of the power supply unit 1. FIG. As described above, for example, the main body case has substantially the same outer dimensions as a B5 size personal computer, and specifically, has a vertical (200) ×
It is horizontal (256) × height (18) mm.

The main body case has a space 5 for accommodating a power supply board therein, a space 6 for accommodating a control board, and spaces 7a and 7b for separately accommodating a battery unit 14 described later. Have. The power supply board includes AC / DC switching power supply circuits 11, 2
Various electronic components constituting the DC / DC switching power supply circuits 12 and 13, the charging circuit 15, the switch circuit 16, and the like are mounted, and various electronic components constituting the control unit 20 described later are mounted on the control board. I have. The power supply board, the control board, and the battery unit are electrically connected to each other as necessary by a connection member.

An end of one side of the main body case is provided with AC
An inlet 2c is provided, and an AC cord 2 (not shown) is connected to the AC inlet 2c. Therefore, the AC cord 2 and the AC inlet 2 are provided inside the power supply unit.
The power supply voltage of the commercial power supply of AC100V is drawn in via the line c.

At the center of one side of the main body case, an operation panel (not shown) having a power switch, a display LED, and the like is provided. Further, as shown in FIG. 2B, a connection cord 4 for a mobile phone is attached from substantially near the center of the bottom surface of the main body case to one side end. The connection cord 4 has a connector 4a at one end and a plug 4b at the other end. The connector 4a and a connector 4c on the main body case 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.
The connection cord 4 is housed as shown by a solid line in FIG. In use, the plug 4b is freely pulled out from the central portion of the connection cord 4 as shown by a dotted line in the figure,
In this state, the mobile phone is connected.

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

That is, when the personal computer is driven by using the power of the power supply unit, the personal computer is mounted on the power supply unit, and the connection cord 3 electrically connects the power supply unit and the personal computer in that state. Connecting. Then, the power supply unit side power is supplied and driven to the electronic circuit inside the personal computer, and the keyboard is operated. At the same time, the power supply unit and the mobile phone can be electrically connected by the connection cord 4 as necessary, and the secondary battery of the mobile phone can be charged by the power of the power supply unit. It has been.

FIG. 3 shows the operation state of the power supply unit 1 in each of a charging mode ST1, a standby mode ST2, a personal computer output mode ST3, and a mobile phone output mode ST4. The standby mode ST2 is a case where the following three states are satisfied. That is, 1. the power switch is off, 2. there is no input of commercial power or the battery is fully charged, 3. no mobile phone is connected. In the standby mode, there is no power supply to the personal computer and the mobile phone.

The charging mode ST1 is a case where the following two conditions are satisfied. That is, 1. The power switch is off, and 2. There is input of commercial power. 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.

Personal computer output mode ST3
Is a case where the condition that the power switch is turned on is satisfied, and this mode further includes two modes, a battery driving ST mode 3a when there is no commercial power input and an AC driving mode ST3b when there is commercial power input. Divided into modes. In the battery drive mode ST3a, the personal computer and the power supply unit 1 are connected by the connection cord 3, and the power switch is turned on, so that the power supply from the battery of the power supply unit 1 to the personal computer is started. On the other hand, in the AC drive mode ST3b, in addition to the connection of the personal computer, the personal computer is connected to the commercial power supply by the AC cord 2, and the power switch is turned on. Power supply to the personal computer is started.

The mobile phone output mode ST4 is a case where the condition that the mobile phone is in a connected state is satisfied, and this mode is also a battery drive mode ST4a when there is no input of commercial power and an input of commercial power. Is divided into two modes of the AC drive mode ST4b. In the battery drive 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,
By connecting the commercial power supply and the power supply unit 1 with the AC cord 2 in addition to the connection of the mobile phone, power supply from the commercial power supply to the mobile phone is started via the AC adapter built in the power supply unit 1. You.

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

FIG. 4 shows a configuration of an internal circuit according to an embodiment of the present invention. With reference to FIG. 4, the configuration and operation of the circuit portion of one embodiment of the present invention will be described. In addition,
4, parts corresponding to those in FIG. 2 are denoted by the same reference numerals.

As shown in FIG. 4, the internal circuit housed in the main body case includes an AC / DC switching power supply circuit 1.
1, 2 DC / DC switching power supply circuits 12, 1
3, battery unit 14, charging circuit 15, switch circuit 1
6 and the control unit 20.

The power input terminal 51 of the AC inlet 2c,
A power supply voltage from a commercial power supply is supplied to the AC / DC switching power supply circuit 11 via 52. The AC / DC switching power supply circuit 11 stabilizes the input AC voltage of AC 100 V to either DC voltage of 16 V or 17 V depending on the case and outputs it in response to a control signal from the control unit 20. AC / DC switching power supply circuit 1
The output voltage formed in 1 is supplied to the DC / DC switching power supply circuit 13, the input terminal of the switch circuit 16, and each part of the charging circuit 15. The input voltage range of the AC / DC switching power supply circuit 11 is, for example, AC
The output voltage is set to 90 A to 276 V, and the output capacity is set to 2.5 A. AC / DC switching power supply circuit 1
1 generates a signal indicating operation / non-operation and supplies the signal to the control unit 20.

The battery unit 14 is formed by integrating a plurality of lithium ion batteries, for example.
Specifically, the battery units 14 are arranged in a so-called three-parallel four-series configuration in which three lithium-ion batteries are connected in parallel and one set of the lithium-ion batteries connected in parallel is connected in four series. There are a total of 12 lithium ion batteries. An output voltage according 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. The charge / discharge regulation voltage of the lithium ion battery is, for example, an upper limit voltage of 4.2 V during charging and a lower limit voltage of 2.5 V during discharging.
Shall be stipulated.

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

The output terminal of the switch circuit 16 is connected to the terminal 53 of the connector 3c, and the terminal 54 of the connector 3c is grounded. The switch circuit 16 turns on in response to a control signal from the control unit 20. Therefore, AC /
The output voltage of the DC switching power supply circuit 11, or
The output voltage of the DC / DC switching power supply circuit 12 is extracted via the terminals 53 and 54 of the connector 3c. The switch circuit 16 has a function of detecting whether a personal computer is connected to the connector 3c as a load, and supplies this detection signal to the control unit 20.

The DC / DC switching power supply circuit 13
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 stabilized to a DC voltage of 5 V and output in response to a control signal from the control unit 20. The output voltage generated in the DC / DC switching power supply circuit 13 is taken out via the terminals 55 and 56 of the connector 4c. Note that the output capacity of the DC / DC switching power supply circuit 13 is 0.5 A. In addition, the DC / DC switching power supply circuit 13
Generates a signal indicating operation / non-operation and supplies the signal to the control unit 20.

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

The control section 20 for controlling the above-described sections is mainly composed of a microcomputer, and a peripheral circuit group related to input / output with each circuit other than the microcomputer;
And a circuit group related to the protection operation. The control unit 20 monitors an operation signal / non-operation signal, a detection signal, and an output voltage of the battery unit 14 from each unit, generates a control signal according to each state, and supplies this control signal to each unit. Centrally manage the entire power supply unit.

For example, when the AC power 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 controls the signal from the AC / DC switching power supply circuit 11 , A control signal for disabling the DC / DC switching power supply circuit 12 is generated.
The power is supplied to the DC switching power supply circuit 12. Therefore,
The DC / DC switching power supply circuit 12 enters a non-operating state.

FIG. 5 schematically shows the state described above. Note that, in FIG. 5, the portions corresponding to FIG. 4 are denoted by the same reference numerals. In other words, the DC / DC switching power supply circuit 12 is made inactive by the control signal from the control unit 20, thereby having the same function as the switch circuit 17. When the commercial power supply voltage is supplied in this manner, the output voltage of the AC / DC switching power supply circuit 11 is used, so that the power of the battery unit 14 is not wasted and the consumption of the battery unit is prevented. Conversely, AC /
A common connection point 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 without directly controlling the DC switching power supply circuit 11 and the DC / DC switching power supply circuit 12 (FIG.
(Indicated by s in the figure) may be provided with a switch circuit 17, and the switch circuit 17 may be controlled by the control unit 20.

In this state in which the output voltage of the AC / DC switching power supply circuit 11 is used, the control unit 20 outputs the detection signal from the switch circuit 16 and the DC / DC
A control signal is generated based on an operation signal / non-operation signal from the switching power supply circuit 13, an output voltage of the battery unit 14, and a detection signal (not shown) indicating a state of a power switch. Specifically, when the load is applied to any of the connectors 3c and 4c,
When the power supply switch is turned off and the output voltage of the battery unit 14 has not reached the upper limit voltage, a control signal for performing constant current charging is generated in the control unit 20. The control signal is supplied to the charging circuit 15 and also to the AC / DC switching power supply circuit 11.

Therefore, in this case, the output voltage of the AC / DC switching power supply circuit 11 is switched,
The battery unit 14 is charged with a constant current using the output voltage of 17 V from the C / DC switching power supply circuit 11. When it is detected that the output voltage of the battery unit 14 has reached the upper limit voltage, the control unit 20
A control signal for performing constant voltage charging in the control unit 15
, And this control signal is supplied to the charging circuit 15. Therefore, in this case, the battery unit 14 is charged with a constant voltage using the output voltage of 17 V 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.

When a personal computer is connected to the connector 3c and the power switch is on, a control signal for turning on the switch circuit 16 and a control signal for stopping the charging operation are transmitted to the control unit. 15, 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, AC / D
The output voltage from the C switching power supply circuit 11 is supplied to the personal computer via the switch circuit 16 and the connector 3c.

Further, when a portable telephone is connected to the connector 4c, the output voltage of the AC / DC switching power supply circuit 11 is used for the DC / DC switching power supply circuit 13 regardless of the connection of the personal computer and the state of the power switch. Operates, and the output voltage of the DC / DC switching power supply circuit 13 is supplied to the mobile phone via the connector 4c. Accordingly, the secondary battery is charged in the mobile phone.

On the other hand, AC / DC switching power supply circuit 1
If no commercial power supply voltage is supplied to
, A control signal for activating the DC / DC switching power supply circuit 12 is generated based on a signal from the AC / DC switching power supply circuit 11, and this control signal
The power is supplied to the C / DC switching power supply circuit 12. Therefore, the DC / DC switching power supply circuit 12 enters an operating state.

The control unit 20 activates the DC / DC switching power supply circuit 12 and operates the battery unit 1.
In this state using the power of the switch circuit 4, the switch circuit 1
6, a control signal is generated based on the operation signal from the DC / DC switching power supply circuit 13, the output voltage of the battery unit 14, and a detection signal (not shown) indicating the state of the power switch. Specifically, when the output voltage of the battery unit 14 has reached 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 the DC signal is generated.
A control signal for deactivating / DC switching power supply circuit 12 is generated. Therefore, in this case, the connector 3c
Connected to a personal computer,
Even when the mobile phone is connected to the connector 4c, the output voltage is never supplied from the power supply unit side.

When the output voltage of the battery unit 14 has not reached the lower limit voltage, the personal computer is connected to the connector 3c, and the power switch is turned on, the switch circuit 16 is turned on. A control signal is generated in the control unit 15, and the 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 power of the battery
6 and the connector 3c.

Further, when the output voltage of the battery unit 14 has not reached the lower limit voltage and the portable telephone is connected to the connector 4c, the battery is not connected regardless of the connection of the personal computer or the state of the power switch. DC / DC switching power supply circuit 12 by power of unit 14
The DC / DC switching power supply circuit 13 operates with the output voltage generated in the step (1), 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.

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

As shown in FIG. 6, a resistor 34 is provided at a 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. ing.
Also, 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 precharge circuit 25 is connected in parallel with the switch circuit 28.

Further, as shown in FIG.
Reference numeral 0 denotes a microcomputer 21, a group of peripheral circuits related to input / output with each circuit, and a group of circuits related to protection operation. The microcomputer 21 has seven input terminals 21a, 21c, 21d, 21e, 21i, 2
1m, 21n and six output terminals 21b, 21f, 21
g, 21h, 21j, and 21k. The seven input terminals 21a, 21c, 21d, 21e, 21i, 21m,
21n is supplied with a signal from each unit.

More 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 via the diode 39. The operation signal / non-operation signal of the AC / DC switching power supply circuit 11 generated by the AC / DC switching power supply circuit 11 is supplied to the input terminal 21 c via the operation signal generation circuit 24.

Two resistors 32 and 33 and a switch circuit 38
These form the switch circuit 16 in FIG. The output voltage at the common connection point between the resistors 32 and 33 is supplied to the input terminal 21d. Based on this output voltage, it is detected whether a personal computer as a load is connected to the connector 3a.

The resistor 34 is connected to the AC / DC switching power supply circuit 11 or the DC / DC switching power supply circuit 12
This is for detecting the output current. An output voltage generated at both ends of the resistance 34 is supplied to the current detection circuit 22. The current detection circuit 22 has, for example, a resistance of 2.4 A
When the above current flows, it is determined that an overcurrent state has occurred.
Generate a high-level signal. This detection signal is supplied to the input terminal 21e. Microcomputer 21
In the case of an overcurrent state based on a detection signal supplied via the input terminal 21e, the operation of each unit is forcibly stopped.

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

The microcomputer 21 has seven input terminals 21a, 21c, 21d, 21e,
Each signal supplied to each of 21i, 21m, and 21n is monitored, a determination process is performed, and a control signal corresponding to each state is generated. Each control signal generated by the microcomputer 21 has six output terminals 21b, 21b.
f, 21g, 21h, 21j, and 21k.

More specifically, when the battery unit 14 is fully charged from the output terminal 21b, AC /
A control signal for setting the DC switching power supply circuit 11 to the power saving mode is output. 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.

Precharge circuit 25 and switch circuit 26
And the switching signal generation circuit 27 constitute the charging circuit 15 in FIG. Output terminals 21f and 21j
Outputs a control signal for charging the battery unit 14.

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 switching signal changes the output voltage of the AC / DC switching power supply circuit 11 from 16V to 17V. Can be switched. At the same time, the precharge 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 to the high level.

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 precharge circuit 27 is stopped. At the same time, 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 a low-level control signal is supplied from the output terminal 21j to the switching circuit 27, the output voltage of the AC / DC switching power supply circuit 11 is maintained at 17 V, and the constant voltage is applied to the battery unit 14. Charging is done.

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

In the embodiment of the present invention described above, the AC / DC switching power supply circuit 11, the DC / DC
A case has been described in which a control signal is supplied to the DC switching power supply circuits 12 and 13 to directly control operation / non-operation. However, a switch circuit is inserted into an input line or output line of each power supply circuit, The circuit may be controlled by the control 20 to disconnect each power supply circuit from the current path, so that power from the specified portion may be used.

In the embodiment of the present invention described above, when the output voltage of the battery unit 14 does not reach the lower limit voltage and the portable telephone is connected to the connector 4c, 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 connection and the state of the power switch has been described.
When only a mobile phone is connected to c, the output voltage of the battery unit 14 may be directly supplied to the DC / DC switching power supply circuit 13. For example, FIG.
In the specific circuit shown in FIG. 7, 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 switching power supply circuit 12
Is inoperative.

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-gadmium battery, a nickel-metal hydride battery, or the like may be used. Is also good.

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

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

That is, when the AC power cord 2 is connected to the AC inlet 2 c and the commercial power supply voltage is supplied to the AC / DC switching power supply circuit 11, the control unit 20 controls the signal from the AC / DC switching power supply circuit 11. , A control signal for electrically disconnecting the power supply pack 14 from the DC / DC switching power supply circuit 12 is generated, and the control signal is supplied to the switch circuit 18. Therefore,
When the DC / DC switching power supply circuit 12 is
The output voltage of the C / DC switching power supply circuit 11 is supplied to a personal computer.

On the other hand, AC / DC switching power supply circuit 1
If no commercial power supply voltage is supplied to
, A control signal for electrically connecting the power supply pack 14 and the DC / DC switching power supply circuit 12 is generated based on a signal from the AC / DC switching power supply circuit 11, and the 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 generated in the DC / DC switching power supply circuit 12 is supplied to the personal computer.

[0064]

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

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment to which the present invention is applied.

FIG. 2 is an external view for explaining the structure of one embodiment to which the present invention is applied.

FIG. 3 is a diagram showing an operation state of an embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an internal circuit according to an embodiment of the present invention.

FIG. 5 is a block diagram used for describing an embodiment of the present invention.

FIG. 6 is a block diagram showing an example of an internal circuit according to one embodiment of the present invention.

FIG. 7 is a block diagram used for describing another embodiment of the present invention.

[Explanation of symbols]

1 ... power supply unit, 2 c ... AC inlet, 3
... Connection cords for personal computers, 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

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Suda 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Chiho Konno 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Inside Sony Corporation (72) Inventor Yoshisada Okayasu 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo F-term within Sony Corporation (reference) 5G003 AA01 BA01 CC02 DA07 DA16 DA18 GB03 GC05 5H030 AS11 AS14 BB01 BB21 DD12 DD20 FF41 5H410 CC02 CC03 CC05 DD02 DD05 EB25 EB37 EB40 FF03 FF05 FF22 FF25 KK08 LL06

Claims (6)

[Claims] 1. A power supply circuit for forming a first power supply voltage from a commercial power supply, a battery unit including one or more secondary batteries, a charging circuit of the battery unit, and the first power supply voltage are taken out. A power supply unit comprising: a first output terminal; and a second output terminal from which a second power supply voltage formed from the first power supply voltage is extracted. 2. The power supply circuit according to claim 1, wherein the first power supply voltage is output from the battery unit, and the first power supply voltage is extracted from one of the power supply circuit and the battery unit. A power supply unit, characterized in that: 3. A power supply unit interposed between a commercial power supply and an electronic device having a secondary battery therein for supplying an output voltage to the electronic device, wherein the voltage of the commercial power supply is required by the electronic device. A first power supply circuit for forming a stabilized first power supply voltage; a battery unit composed of one or more secondary batteries; and a stabilized predetermined DC voltage required by the electronic device for the voltage of the battery unit. A second power supply circuit for converting the voltage into a voltage, and when a voltage of a commercial power supply is supplied to the first power supply circuit, an output voltage of the first power supply circuit is supplied to the electronic device, and the first power supply circuit A power supply unit for supplying an output voltage of the second power supply circuit to the electronic device when a voltage of a commercial power supply is not supplied to the circuit. 4. The electronic device according to claim 3, further comprising: a charging unit configured to charge the battery unit; and an output voltage of the first power supply circuit or an output voltage of the second power supply circuit. A third power supply circuit that converts the output voltage of the third power supply circuit into a stabilized predetermined DC voltage required by a second electronic device having a secondary battery therein, A power supply unit comprising: a second supply unit that supplies the electronic device. 5. The power supply unit according to claim 4, wherein the battery unit comprises one or a plurality of lithium ion batteries. 6. The power supply unit according to claim 3, wherein the electronic device is a personal computer, and the second electronic device is a mobile phone.