JP2002084665A - Power system which curtails stand-by power consumption - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stand-by power to be consumed in a control circuit for a power switch to zero to the utmost, though a charging power source and a set are normally separated from each other in a power system for a portable telephone, etc., are connected and used when charging is performed, and it is desired to cut the charging power off to curtail stand-by power consumption, when charging is not performed, i.e., when the set is detached from the charging power source or when a main battery is fully charged, and it used to be necessary to supply power of about 50 mW to the power switch control circuit before to start up the charging power source stably. SOLUTION: A minute power source, whose power consumption is minute, is prepared. The control circuit for causing the charging power source to operate is started up by making the minute power source a closed circuit, when the set is connected to the charging power source. Then the power switch oscillates, and the charging power source operates. Moreover, a starting switch is inserted into a part of the minute power circuit. The switch is opened, when the main battery of the set is charged fully, and is made when its voltage becomes a specified value or lower, to start up the charging power source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated set which is normally separated from a charging power source and is used in a power supply system which is connected and used when charging or when the set is driven by a charging power source. The present invention relates to a technology for reducing standby power of a power supply.

[0002]

2. Description of the Related Art A charging power supply and a set are usually separated from each other, and an example of a power supply system connected and used at the time of charging or when the set is driven by the charging power supply is shown in FIG. To explain. First, a cord 4 with a connector plug 3 extends from an AC adapter 2 to which an outlet plug 1 connected to a household commercial power supply is connected. The mounting table 5 has an insertion port 6 into which the connector plug 3 can be fitted.
It is common to also have. There are several connection methods for charging the main battery 10 and the backup battery 11 built in or fitted into the set 9 represented by a mobile phone, and for driving the set 9. As connection method 1, connector plug 3 is inserted into
And put the set 9 on the table 5 and make contact with the charging pins 7 and 8. Connector plug 3 as connection method 2
To insert directly into the set 9. As the connection method 3, the AC adapter 2 is incorporated in the table 5 to become a charger,
A method that simply puts the set 9 on the table 5 that has become a charger.
Can be classified into three types. In order to realize a reduction in standby power, some sets only need to support one type of connection method. However, generally, in a general charging system such as a mobile phone, it is necessary to reduce standby power in accordance with a plurality of connection methods.

[0003] As a conventional technique for reducing the standby power of the charging power source, information on a load output from the secondary side of the charging power source is fed back to the primary side, and the necessary minimum power for driving the load is reduced to the primary side. Has been proposed to supply the secondary side. This technology is realized by, for example, an IC sold by Matsushita Electronics Corporation under the model name of DIL-8. An overview of the technology is available on the company's website. In addition, the company has filed Japanese Patent Application Nos. 6-144639 and 7-146611 relating to this technology. In this system, when the load becomes zero,
In order to activate the IC for controlling the power switch, only a minimum amount of power is supplied by intermittent charging. However, when a load is applied, in order to stably oscillate the power switch and start the charging power source, it is necessary to always use 5
It is necessary to supply power of about 0 mW.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to further greatly reduce the limit of the standby electric power of the conventional charging system for portable devices at around 50 mW.

[0005]

According to the first aspect of the present invention, when a set is not attached to the charging power source, or when the main battery is fully charged and the charging is stopped, the bias of the power switch or the power source is set. Turn off the power of the control circuit that controls the switch.
Then, when the charging power supply is attached to the set, the power supply switch of the charging power supply is turned on by closing the micro power supply circuit connected to the control circuit by the micro power supply.
In some cases, the main battery alone is charged without attaching the main battery that drives the set to the set. In the present invention, such a case is also expressed as a set.

In the invention of claim 2, the plus of the minute power supply is connected to the power supply side signal output terminal of the charging power supply, and the power supply side signal input terminal is connected to the control circuit. The set-side signal input terminal is connected to the set-side signal output terminal through a start switch. When the charging power supply is attached to the set, the power supply side signal output terminal and the set side signal input terminal are connected, and the power supply side signal input terminal and the set side signal output terminal are connected to turn on the control circuit. This is effective when there is room for the number of connection terminals between the charging power supply and the set.

According to a third aspect of the present invention, the power supply side signal input terminal is connected to a current amplifier circuit, and the control circuit is turned on / off via the current amplifier circuit. If the supply power of the minute power supply is minimized, the control circuit cannot operate normally. Therefore, first, the current amplifier circuit is turned on by the minute power supply, and the amplified power is input to the control circuit. Then, the control circuit can operate normally.

In the invention according to claim 4, more specific contents of the minute power supply and the current amplifier circuit will be presented. That is, the voltage on the primary side of the charging power supply is divided by a plurality of resistors into a power supply. The micro power supply and the current amplifier circuit can be simplified and the cost can be reduced.

According to the fifth aspect of the invention, the plus of the minute power supply is connected to the positive output terminal of the charging power supply, and the power supply side signal output terminal and the positive output terminal, and the power supply side signal input terminal and the negative output terminal are made common. The set-side signal input terminal and the positive input terminal, and the set-side signal output terminal and the negative input terminal are shared. Then, the number of terminals required for each of the charging power supply side and the set side is reduced from four to two. By increasing the number of terminals in the conventional power supply system, it is possible to prevent an increase in space and an increase in cost due to an increase in the number of terminals.

According to the present invention, a current amplifier switch which is turned on when a signal input from the minute power supply is positive and a current amplifier reverse switch which is turned on when the signal is negative are arranged in parallel, and are connected in series with the current amplifier. There is a feature to connect to. In the connection of claim 5, when the control circuit is turned on by the minute power supply, if the voltage of the minute power supply is lower than the output voltage on the secondary side of the charging power supply, a negative voltage is applied to the bias of the current amplification circuit switch. Then, the control circuit is turned off, the charging power supply is started, and the operation is stopped immediately after. Therefore, a current amplifier reverse switch that is turned on with a negative bias is connected in parallel with the current amplifier circuit switch so that the control circuit can be kept on even when a negative bias is applied.

The invention according to claim 7 is characterized in that the start switch is turned off when the main battery attached to the set is fully charged, and the start switch is turned on when the main battery has a predetermined capacity or less. In a conventional system, it is general that charging is stopped when the main battery is fully charged, and charging is started again when the main battery has a predetermined capacity or less. Therefore, according to the present invention, it is possible to follow the charging pattern of the conventional system.

The invention according to claim 8 is characterized in that the built-in battery is a minute power supply. When the power of the minute power source is obtained from the charging power source, the power source is small, but requires a standby power for always starting the minute power source. By using batteries, standby power can be reduced to almost zero.

The invention according to claim 9 is characterized in that a charging circuit for charging a built-in battery is provided on the primary side of a charging power supply. When the built-in battery is a primary battery, the battery capacity eventually becomes empty even though the power consumption is very small. When a charging circuit is provided as a secondary battery that can charge a built-in battery as in the present invention, the battery capacity does not become empty, so that there is no need to replace it.

In the invention according to claim 10, a main battery or a backup battery for operating the set is also used as a built-in battery for turning on and off the control circuit.
It is characterized by being shared with the function of driving the original set. There is an effect that it is not necessary to newly provide a built-in battery.

According to the eleventh aspect, a mechanical switch is provided in parallel with the current amplifier circuit switch. Then, even if the battery that turns on and off the control circuit becomes empty and the voltage becomes zero, the charging power supply can be started by pressing the mechanical switch in an emergency.

According to a twelfth aspect of the present invention, there is provided a delay circuit which is turned on for a predetermined time when the mechanical switch is turned on, and then automatically turned off after the mechanical switch is turned on. Prevents mechanical switches from being held down.

The invention of claim 13 is characterized in that it is an IC in which at least two of the three circuits of the micro power supply, the current amplifier circuit and the control circuit are contained in one chip. The combined circuit of these three circuits is a completely novel feature of the present invention. ICs that include some of these features are indispensable for miniaturization and cost reduction. Therefore, even the component IC does not deviate from the power supply system of the present invention.

[0018]

FIG. 2 shows a first embodiment of a power supply system according to the present invention which is used by connecting to a commercial power supply 12 for home use. The present invention is broadly based on the primary side 14 and the secondary side 13
It comprises a charging power supply 16 composed of the secondary side 15 and a set 9 operated by the charging power supply 16. On the primary side 14, a rectifying / smoothing circuit 17, a power switch 18, a minute power supply 19, a start switch 20 and a control circuit 21 are put. When the charging power supply 16 and the set 9 are attached, the output of the micro power supply 19 is input to the power supply terminal 22 of the control circuit 21 via the start switch 20 to form a micro power supply circuit 23 surrounded by a dashed line. The control circuit 21 is connected to the power switch bias 24. More specifically, the plus 25 of the micro power supply 19 is connected to the power supply side signal output terminal 26.
, And the minus 27 is connected to the earth 28 of the primary side 14. The power supply terminal 22 is connected to the power supply side signal input terminal 29. The set side 9 is provided with a set side signal input terminal 30 and a set side signal output terminal 31 via a start switch 20. The charging power supply 16 is provided with a positive output terminal 32 and a negative output terminal 33, and the set 9 is provided with a positive input terminal 34 and a negative input terminal 35. Further, the set 9 is provided with a charge management circuit 36, which is connected to the start switch 20 and the charge switch 37. Although not shown in the drawing, the number of terminals can be reduced by connecting the power supply side signal output terminal 26 and the negative electrode output terminal 33 and the set side signal input terminal 30 and the negative electrode input terminal 35 so as to be common.

The operation will be described with reference to FIG. 2. When the set 9 is attached to the charging power supply 16 connected to the household commercial power supply 12, the power supply side signal output terminal 26 and the set side signal input terminal
30 is connected, and the power supply side signal input terminal 29 and the set side signal output terminal 31 are connected. Of course, the positive output terminal of the charging power supply 16
The positive input terminal 34 of the set 9 and the negative output terminal 33 of the charging power supply 16 and the negative input terminal 35 of the set 9 are also connected.
At this stage, the start switch 20 is set to ON by the power of the main battery 10. Therefore, the voltage of the minute power supply 19 is applied to the power supply terminal 22, and the control signal of the control circuit 21 is input to the power supply switch bias 24, and the power supply switch 18
Oscillation causes the charging power supply 16 to start. When the charging power supply 16 is activated, the set 9 includes a positive input terminal 34 and a negative input terminal.
Power is supplied from 35. Further, the main battery 10 driving the set 9 is charged through the charge switch 37 and reaches a full charge. At that time, the start switch 20 is turned off by a command from the charge management circuit 36 operating on the main battery 10.
Then, since the voltage of the micro power supply 19 applied to the power supply terminal 22 is cut off, the oscillation of the power supply switch 18 is stopped, and the current flowing through the charging power supply 16 becomes only the power consumption of the micro power supply 19, and the standby power can be reduced. . Therefore, even when the charging power supply 16 and the set 9 are connected, the standby power can be reduced when the main battery 10 is fully charged, thereby further increasing the effect of reducing the standby power. Even if the number of terminals is reduced by connecting the power supply side signal output terminal 26 and the negative output terminal 33 and connecting the set side signal input terminal 30 and the negative input terminal 35 and reducing the number of terminals, the set 9 The effect is the same, except that the potential of the negative input terminal 35, which is the ground line of, becomes the same as the plus 25 potential of the minute power supply 19. Therefore, the number of terminals can be reduced from four to three.

Next, a second embodiment is shown in FIG. Although the outline is the same as that of the first embodiment, the difference is that in the second embodiment, the current amplification circuit 39 in which the current amplification circuit switches 38 are connected in series is provided.
Is provided. The power supply side signal input terminal 29 is connected to the current amplifier circuit switch bias 40, and the power supply terminal 22 is connected to the output terminal 41 of the current amplifier circuit 39 by outputting the output.

The operation of the second embodiment will be described with reference to FIG. 3. The outline of the operation is also the same as that of the first embodiment, and therefore, different points will be described. When the set 9 is attached to the charging power supply 16, the power of the micro power supply 19 is input to the current amplification circuit switch bias 40 through the start switch 20 to turn on the current amplification circuit switch 38. Then, power sufficient to cause the power switch 18 to oscillate in the current amplification circuit 39 is supplied to the power supply terminal 22.
And the power switch 18 is oscillated to activate the charging power supply 16. In addition, MOS-FET is a current amplification circuit switch
When used for 38, the current amplifier circuit switch 38 can be turned on and off with a very small current, so that the power consumption of the minute power supply 19 can be extremely reduced. By the way, although not shown in the drawing,
The power supply side signal output terminal 26 and the negative electrode output terminal 33 are shared,
The number of terminals can be reduced as in the case of the first embodiment.

Next, a third embodiment is shown in FIG. Here, after the rectifying and smoothing circuit 17, the DC voltage of the primary side 14 is changed to the resistors 39-1 and 3-3.
9-2, the current is divided by a resistor, and a current amplifier circuit switch 38 is connected in series therebetween to form a current amplifier circuit 39. By the way, resistance 39
Are a plurality of resistors, which are distinguished by serial numbers at the end. However, when it is not necessary to distinguish them, the same reference numerals as those of the current amplifying circuit 39 are given, and they are collectively expressed as a resistor 39. In FIG. 4, for the sake of simplicity, the resistor 39 is a resistor 39-1.
And two resistors 39-2. Then, the power supply side signal input terminal 29 is connected to the current amplification circuit switch bias 40, and the power supply terminal 22 is connected to the output 41 between the current amplification circuit switch 38 and the resistor 39-2. Similarly, the minute power source 19 is formed by connecting the resistors 19-1 and 19-2 in series, and plus 25 is set between the resistors 19-1 and 19-2.

The operation of the third embodiment is the same as the operation of the second embodiment. The micro power supply 19 and the current amplifying circuit 39 are manufactured by resistance division as an example.

Next, a fourth embodiment will be described with reference to FIG. 5. The plus 25 of the minute power supply 19 is connected to the positive output terminal of the charging power supply 16.
32, the power supply side signal output terminal 26 and the positive output terminal 32
And the power supply side signal input terminal 29 and the negative electrode output terminal 33 are also common. Similarly, the positive input terminal 34 and the set signal input terminal 30 of the set 9 and the negative input terminal 35 and the set signal output terminal 31 are also common. The start switch 20 is connected in series via the high-resistance body 44 in a direction in which current flows from the positive input terminal 34 to the negative input terminal 35. However, a diode 45 is inserted between the positive 25 and the positive output terminal 32, and the transformer 13
A diode 46 is also inserted between the output terminal 32 and the positive electrode output terminal 32 to prevent reverse flow from the direction of the positive electrode output terminal 32. Others are the same as the third embodiment. Then, the output voltage of the minute power supply 19 is made higher than the voltage output to the secondary side 15 of the charging power supply 16.
For example, if the voltage output to the positive electrode output terminal 32 is 5 V,
The output voltage of the minute power supply 19 is set to about 7V to 10V.

To explain the operation, it is assumed that the output voltage of the minute power supply 19 is 10 V and the output voltage of the charging power supply 16 is 5 V. Since the plus 25 of the minute power supply 19 is common to the positive output terminal 32, it has the same potential. Also, since the negative output terminal 33 and the power supply side signal input terminal 29 are common, the power supply side signal input terminal 29
Is 5 V lower than the potential of the positive electrode output terminal 32. Therefore, a voltage of 5 V obtained by subtracting 5 V from 10 V is applied to the current amplifier switch bias 40 as a bias voltage, and the current amplifier switch 38 is turned on. 1 when charging power supply 16 is not running
0 V directly turns on the current amplification circuit switch 38 as a bias voltage. In any case, set 9 with charging power supply 16
Is connected and the start switch 20 is on, the power supply from the charging power supply 16 to the set 9 can be maintained. That is, in the fourth embodiment, the charging power supply 16
And the number of terminals of the set 9 can be reduced to two, the same as the conventional one.

Next, a fifth embodiment will be described with reference to FIG. Current amplifier reverse switch 42 in parallel with current amplifier switch 38
Connect. The current amplification circuit switch 38 is turned on when the current amplification circuit switch bias 40 is positive, while the current amplification circuit reverse switch 42 is turned on when the current amplification circuit reverse switch bias 43 is negative. The power supply side signal output terminal 26 and the positive output terminal 32 are made common, and the power supply side signal input terminal 29 and the negative output terminal 33 are made common. Therefore, the positive input terminal of set 9
34 and the set-side signal input terminal 30, and the negative electrode input terminal 35 and the set-side signal output terminal 31 are also common. Start switch 20
Are connected in series via the high-resistance body 44 in a direction in which current flows from the positive input terminal 34 to the negative input terminal 35. However, insert the diode 45 between the positive 25 and the positive output terminal 32,
A diode 46 is also inserted between the positive output terminal 32 and the transformer 13 to prevent reverse flow from the positive output terminal 32 direction.
However, unlike the fourth embodiment, it is assumed that the output voltage of the minute power supply 19 is lower than the output voltage of the charging power supply 16. The ground of the minute power supply 19 is connected to a current amplifier circuit 39 and a current amplifier circuit switch 38.

The operation will be described with reference to FIG. 6. For simplicity, it is assumed that the charging power supply 16 is an AC adapter having an output voltage of 5V. It is assumed that the output voltage of the minute power supply 19 is 3V. First, the output voltage of the charging power supply 16 is connected to the household commercial power supply 12. At this stage, the charging power supply 16 does not start. Next, when the set 9 is connected, since the start switch 20 is on, the output from the plus power supply 25 of the minute power supply 19 is output.
The voltage of V enters the positive input terminal 34 from the positive output terminal 32,
After passing through the start switch 20, the light enters the negative output terminal 33 from the negative input terminal 35. Then the current amplifier switch bias 40
A plus 3V voltage is applied to the reverse switch bias 43 of the current amplifier circuit. The current amplification circuit switch 38 is turned on, and the current amplification circuit reverse switch 42 remains off. When the current amplification circuit switch 38 is turned on, the current amplified from the current amplification circuit 39 flows and is input to the power supply terminal 22. Then, the power switch 18 starts oscillating, the charging power supply 16 starts, and 5 V is output from the positive output terminal 32. Then, the current amplifier circuit switch bias 40 and the current amplifier circuit reverse switch bias 43
Will be applied as a bias voltage of -2V obtained by subtracting 5V from 3V. Then, the current amplification circuit switch 38 is turned off, the current amplification circuit reverse switch 42 is turned on, and the current amplification circuit 39 can be kept on. Therefore, the charging power supply 16 can maintain the operation. Next, when the main battery 10 is fully charged, the start switch 20 is turned off by a command from the charge management circuit 36. Then, the voltages of the current amplifier circuit switch bias 40 and the current amplifier circuit reverse switch bias 43 become zero, and the current amplifier circuit switch 38 and the current amplifier circuit reverse switch 42 are both turned off, so that the current amplifier circuit 39 is turned off. Then, the power switch 18 also stops oscillating and the charging power supply 16
The standby power flowing through the small power supply 19 is only the minimum power consumed by the micro power supply 19. If the capacity of the main battery 10 gradually decreases and cuts off the predetermined voltage, the start switch 20 is turned on by a command from the charge management circuit 36 operating with the power of the main battery 10, and the charging power supply 16 is restarted. The main battery 10 is charged. In the fifth embodiment, similar to the fourth embodiment, it is not necessary to add a new terminal for reducing standby power.

Next, the sixth embodiment will be described with reference to the primary side of the charging power supply 16.
7 is extracted and shown in FIG. 7. Since the internal battery 19 is configured as the minute power supply 19, the internal battery 19 will be described using the same reference numerals as those of the minute power supply 19. Further, since it is the same as the above-described embodiment, the detailed description is omitted. To explain its function,
In order to activate the minute power supply 19, minute power consumption is required even during standby. However, since the built-in battery 19 has its own power, only minimal power for turning on and off the current amplification circuit switch 38 and the like is required. Therefore, the standby power can be reduced to almost zero.

Next, a seventh embodiment in which a built-in battery charging circuit 47 of the built-in battery 19 is added will be described with reference to FIG. First, the power supply of the built-in battery charging circuit 47 is taken from the output 41, and the built-in battery 19 is a rechargeable NiCd battery, a lithium coin secondary battery, or the like. However, if the built-in battery 19 can be safely charged, the output 41 and the plus 25 may be simply connected. In this case, the current amplifying circuit 39 also functions as the built-in battery charging circuit 47.

The operation is as follows. While the current amplification circuit switch 38 or the current amplification circuit reverse switch 42 is turned on and the charging power supply 16 is activated, the built-in battery charging circuit 47 is also turned on, and the battery capacity of the consumed internal battery 19 is reduced. Replenish. Therefore, the built-in battery 19 having a small rated capacity can be selected, which is effective in reducing the size, weight, and cost.

Next, an eighth embodiment in which the main battery 10 or the backup battery 11 attached to the set 9 is used as the minute power source 19 will be described with reference to FIG. Set battery signal output terminal 31 through plus switch 25 of main battery 10 through start switch 20
Connect to The start switch 20 and the charge switch 37 are both connected to the charge management circuit 36. Power supply signal input terminal
29 is connected to the current amplifier circuit switch bias 40. The power terminal 22 is connected to the output 41 and also to the negative output terminal 33.

The function is as follows. When the set 9 is not attached to the charging power source 16, the power for oscillating the power switch 18 is not input to the power terminal 22, so that the charging power source 16 does not start. Therefore, the standby power is zero. Next, when the charging power supply 16 is connected to the household commercial power supply 12 and the set 9 is attached, the voltage of the main battery 10 is applied to the current amplification circuit switch bias 40, and the current amplification circuit switch 38 is turned on. Since power is supplied to the power supply terminal 22, the control circuit 21 is turned on. Then, the power switch 18 starts oscillating and the charging power supply 16 starts. When the main battery 10 is fully charged, the charge management circuit 36 switches the charge switch.
A charge stop off command is issued to 37, and an off command is also issued to the start switch 20. Then, there is no power input to the power supply terminal 22, so the power switch 18 stops oscillating,
The charging power supply 16 enters a standby mode of zero standby power. Here, the description has been made on the assumption that the minute power supply 19 is the same as the main battery 10,
The gist of the invention is the same whether the backup battery 11 is used or another dedicated battery is used.

Next, a ninth embodiment will be described with reference to FIG. In the ninth embodiment, a mechanical switch 48 and a delay circuit 49 are added in parallel with the current amplification circuit switch 38.

According to the sixth to eighth embodiments, the charging power supply 16 cannot be activated when the battery capacity of the built-in battery 19 becomes empty. Of course, the description has been given as a charging system that does not become empty as much as possible. However, there is a possibility that the battery capacity becomes empty when the built-in battery 19 is defective, or when the battery is left for a long time at a high temperature and self-discharges.
In such a case, if the mechanical switch 48 is turned on manually, a current can flow to the output 41 and the charging power supply 16 can be started, which is a measure in case of emergency. The delay circuit 49 may be omitted, but by adding the delay circuit 49, the built-in battery 19 is sufficiently charged while the delay circuit 49 is operating. Further, when the operation of the delay circuit 49 ends, the circuit of the mechanical switch 48 is automatically turned off, and there is an effect of returning to the original standby power zero mode.

In the tenth embodiment, as shown by an alternate long and short dash line in FIG. 5, an IC 50 in which at least two of the three circuits of the micro power supply 19, the current amplifying circuit 39 and the control circuit 21 are contained in one chip. It is. The combined circuit of these three circuits is a completely novel feature of the present invention. ICs that include some of these features are indispensable for miniaturization and cost reduction. Therefore, even the component IC does not deviate from the power supply system of the present invention. Of course the current amplifier switch 38
It is also within the scope of the present invention to make a single module including the power switch 18 and the like.

[0036]

According to the prior art, a charging power supply 16 for a cellular phone or the like is used.
It is necessary to supply a minimum necessary power to keep the control circuit 21 of the control circuit always activated. In order to start the charging power supply 16 stably, the power is required to be around 50 mW, and it is a small amount of power, but a huge amount is used even if only the AC adapter is used. Become. In the present invention, the set 9 is attached to the charging power supply 16, and the micro power supply circuit 23 is connected to the control circuit 21 only when necessary, and the control circuit 21 is started by supplying the minimum power from the micro power supply 19. Therefore, at the time of standby, only the minimum power supplied to the minute power supply 19 is obtained. Further, by inserting a current amplifier circuit 39 between the micro power supply circuit 23 and the control circuit 21, the output of the micro power supply 19 can be minimized. Furthermore, if the minute power supply 19 is a built-in battery, the standby power becomes almost zero, so that the effect of power reduction is great. This power supply system is highly effective because it can support all three connection methods described in the section of the related art.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connection form of a general power supply system.

FIG. 2 is a circuit diagram showing Embodiment 1 of the present invention.

FIG. 3 is a circuit diagram showing Embodiment 2 of the present invention.

FIG. 4 is a circuit diagram showing Embodiment 3 of the present invention.

FIG. 5 is a circuit diagram showing a fourth embodiment of the present invention.

FIG. 6 is a circuit diagram showing a fifth embodiment of the present invention.

FIG. 7 is a circuit diagram showing Embodiments 6, 7, and 9 of the present invention.

FIG. 8 is a circuit diagram showing Embodiment 8 of the present invention.

[Explanation of symbols]

 2 is an AC adapter 3 is a connector plug 5 is a stand 9 is a mobile phone 10 is a main battery 16 is a charging power supply 18 is a power switch 19 is a micro power supply 20 is a start switch 21 is a control circuit 23 is a mechanical switch 39 is a current amplification circuit 47 Is the built-in battery charging circuit 49 is the delay circuit 50 is the IC

Claims (13)

[Claims] A set provided with a main battery and a charging power supply are usually separated from each other, and in a device connected and used at the time of charging or when the set is driven by the charging power supply, a primary side of the charging power supply. A power switch, and a control circuit for turning on and off the power switch. The charging power supply or the set further includes a micro power supply connected to the charging power supply and a micro power supply circuit extending over the set. A power supply system that starts up the control circuit with a power supply. 2. A power supply side signal output terminal of the charging power supply is connected to a positive side of the minute power supply, a power supply side signal input terminal is connected to the control circuit, and a set side signal input terminal is connected to a set side signal via a start switch. The power supply side signal output terminal and the set side signal input terminal, and the power supply side signal input terminal and the set side signal output terminal are connected when the set is connected to the output terminal and the charging power source is attached to the charging power source. Power system. 3. The power supply system according to claim 1, further comprising a current amplification circuit that is turned on and off by said minute power supply. 4. The power supply system according to claim 1, wherein one or both of said minute power supply and said current amplifying circuit are resistance-divided from said primary side voltage. 5. The positive power supply of the charging power supply is connected to a positive output terminal of the charging power supply, the power supply side signal output terminal and the positive output terminal, the power supply side signal input terminal and the negative output terminal, and the set side signal input. 2. The power supply system according to claim 1, wherein the terminal and the positive input terminal, and the set side signal output terminal and the negative input terminal are shared. 6. A current amplification circuit switch which is turned on when a signal input from said minute power supply is positive, and a current amplification circuit reverse switch which is turned on when said signal is negative, are connected in series to said current amplification circuit. Item 3. The power supply system according to Item 3. 7. The power supply system according to claim 1, wherein said start switch is turned off when said main battery is fully charged, and said start switch is turned on when said main battery has a predetermined capacity or less. 8. The power supply system according to claim 1, wherein an internal battery is used as said minute power supply. 9. The power supply system according to claim 8, wherein a charging circuit for charging said internal battery is provided on said primary side. 10. The power supply system according to claim 8, wherein said main battery or backup battery for operating said set is said built-in battery. 11. The power supply system according to claim 8, wherein a mechanical switch is provided in parallel with said current amplification circuit switch. 12. A delay circuit which turns on the mechanical switch for a predetermined time and then turns off automatically after the mechanical switch is turned on.
11 power systems. 13. An IC in which at least two circuits among the three circuits of the minute power supply, the current amplifier circuit, and the control circuit are contained in one chip.