JPH0635575A - Power supply system - Google Patents

Abstract

PURPOSE:To prevent driving time by a battery from being shortened in an electronic unit such as a personal computer driven by the battery and to prevent deterioration on account of over-discharge in a charging battery. CONSTITUTION:Even if the stop period of the electronic unit main body such as the personal computer lasts for a long time, the power of a power control circuit consuming power in spite of the ON/OFF of main body power is supplied not from the battery but from a solar battery Namely, a voltage supply line from the battery 1 for the power control circuit 7 is cut and the solar battery 20 is connected to the power terminal of the power control circuit in power circuit constitution where power is supplied from the battery 1 to loads 3 and 4 through a DC/DC conversion part 2 and power is supplied to the power control circuit 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for reducing consumption of a main battery of electronic equipment such as a personal computer driven by a battery. More specifically, a solar cell is used to supply power to the power supply control circuit.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a power supply circuit for supplying a desired voltage from a main battery to a load by a DC / DC conversion circuit, which is an embodiment of the prior art. In the figure, 1 is a main battery, 2 is a DC / DC conversion circuit (pulse width modulation PWM, detailed wiring is not shown in the figure), 3 and 4 are loads, 5 is a transistor, 6 is a battery voltage value detection circuit, 7 Is a power supply control circuit, 8 is a main body power ON / OFF switch, 9 is a control circuit such as a microprocessor having an AD conversion function, and 10 is a voltage regulator for generating a voltage to be supplied to the control circuit 9.

Next, the operation will be described. When the power of the main unit is ON, the load 3 and the load 4 are connected to the main battery 1 to D.
Electric power is supplied via the C / DC conversion circuit 2. Most of the battery power is consumed by these loads. The control circuit 9 drives the DC / DC conversion circuit 2 through the output line a based on an instruction from the main body power ON / OFF switch 8 to supply power to the loads 3 and 4. The control circuit 9
Output line b when the period during which the operation is unnecessary even when the load is reached
Therefore, the transistor 5 can be turned ON / OFF to save the power of the main battery 1. Electric power is supplied to and cut off from the load 4 by turning the transistor 5 on and off, and is controlled by the output line b of the control circuit 9.

The battery voltage value detection circuit 6 transfers the terminal voltage of the main battery 1 to the control circuit 9.
The control circuit 9 monitors the input line c to monitor the voltage drop due to the discharge of the main battery, and when the main battery terminal voltage has dropped to a voltage exceeding the operating range of the DC / DC conversion circuit 2, malfunction is detected. To prevent this, the operation of the DC / DC conversion circuit 2 is stopped by the output line a. When the main battery 1 is rechargeable, a charger (not shown) that charges the main battery 1 is controlled to stop overcharging to prevent overcharging.

The voltage regulator 10 is a voltage regulator that generates a constant voltage to be supplied to the control circuit 9, and this power is supplied from the main battery. When the main battery terminal voltage is within the operating voltage range of the power supply terminal of the control circuit 9, the voltage dividing resistance element of the battery voltage value detection circuit 6 can be deleted, and the battery terminal is directly connected to the control circuit 9. It is possible.

In this power supply circuit configuration, by turning off the power ON / OFF switch 8 of the main body, the power is not supplied to the loads 3 and 4 which are the main loads of the main battery, but the power ON / OFF switch 8 of the main body is turned off. O
Since it is necessary to keep the control circuit in an operating state so that the N / OFF state can always be recognized, a small amount of power is supplied to the power supply control circuit 7 such as the battery voltage value detection circuit 6, the control circuit 9 and the voltage regulator 10. Continue to supply. For example, depending on the scale of the device, when power of about 10 W is supplied to the loads 3 and 4, the power supply control circuit 7 is set to 1 even when the main body power ON / OFF switch 8 is OFF.
It supplies a power of 0 to 20 mW, and continues to supply a small amount of power as compared to the case where the main battery supplies power to the loads 3 and 4 when the power ON / OFF switch 8 of the main body is ON. Even if it does, it consumes the power of the main battery.

[0007]

The conventional power supply device is configured as described above, and in the device that supplies power to the power supply control circuit even when the power supply of the main body is cut off, the power supply of the main body is turned on when it is not used. Even if the OFF switch is turned off, the main battery always supplies power to the power control circuit, which consumes the main battery and shortens the operation time. Further, when the main body power is turned off for a long period of time such as several months, there is a problem that the main battery is over-discharged and deteriorates when the main battery is a rechargeable type.

Further, in order to completely disconnect these loads from the main battery, the main body power ON / OFF switch 8 may be arranged at the Y portion in the figure. In this case, the main body power ON
・ Because it is necessary to apply a large current to the contact of the OFF switch 8, the power switch size becomes large and the wiring material becomes thick.
The device cannot be downsized, and the main unit power is turned off.
However, there is a problem that it cannot be applied to the application for supplying electric power to some loads (for example, the load 4 in FIG. 3), that is, the resume operation.

Further, for example, a solar cell is used in the conventional "memory protection device using a solar cell" and "control device for a washing machine" disclosed in Japanese Utility Model Laid-Open No. 59-130130 and Japanese Patent Laid-Open No. 62-205410. All of them are used, but when the main power supply is turned off, the solar cell tries to supply power to the load instead of the main power supply, and the solar cell needs to supply a large amount of power to the load. Therefore, the solar cell requires a large capacity of electromotive force generation,
There is a problem that the device becomes large and a low-cost device cannot be obtained.

The present invention has been made to solve the above problems, and reduces the consumption of the main battery when the power of the main body of the power supply device is turned off, and the main battery is over-discharged. The purpose is to provide a power supply system to prevent.

[0011]

According to a first aspect of the present invention, there is provided a power supply system in which power supply to a power supply control circuit is disconnected from a main battery, and a photoelectric converter such as a solar cell is connected to the power supply control circuit. It supplies power to the power control circuit to reduce power consumption and life deterioration of the main battery.
It has the following elements. (A) A switch for turning on / off the power of the electronic device, (b) O of the above switch
A power control circuit that recognizes N / OFF and controls the supply of electric power to the load of the electronic device, (c) When the switch is ON, the load of the electronic device is controlled based on the control of the power control circuit. And (d) a photoelectric converter that supplies power to the power supply control circuit when the switch is OFF.

A power supply system according to a second invention is a system for supplying a voltage to a power supply control circuit even when the main body power supply is cut off in an electronic device driven by a battery. A capacitor or a rechargeable battery is connected in parallel.

A power supply system according to a third aspect of the present invention is a battery-powered electronic device, wherein the main battery is a rechargeable battery, and a voltage is supplied to the power supply control circuit even when the power supply of the main body is cut off. A photoelectric converter such as a solar cell having an electromotive force sufficient to cover the current consumption of the control circuit and the self-discharge current of the main battery is connected in parallel to the main battery that supplies power to the load.

[0014]

In the power supply method according to the first to third inventions, the photoelectric converter such as a solar cell needs to supply power even when the main body power is cut off by obtaining power from indoor light or sunlight. Since power is supplied to a certain power supply control circuit, the load on the main battery is reduced, and even if the main battery is left off for a long time, the main battery power consumption can be prevented and the operation time can be extended.

The power supply system according to the third invention is
Furthermore, it is possible to avoid shortening the life of the main rechargeable battery due to deterioration of the battery due to over discharge.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment in which power is supplied to a power supply control circuit by a solar cell, FIG. 2 is a view showing an embodiment in which the solar battery of FIG. 1 is provided with a buffer charging unit, and FIG. 3 is a power supply control circuit and It is a figure which shows the Example which connected the solar cell to the main battery. In the figure, 1 is the main battery, 2 is DC / DC
Conversion circuit (pulse width modulation PWM, detailed wiring is not shown), 3 and 4 are loads, 5 is a transistor, 6 is a battery voltage value detection circuit, 7 is a power supply control circuit, and 8 is a main power ON / OFF switch , 20 and 21 are solar cells, 2
2 is a voltage supply line to the power supply circuit, and 23 is a charging unit such as a rechargeable battery or a capacitor. The power supply control circuit 7 has a control circuit 9 similar to that shown in FIG.

Embodiment 1. In FIG. 1, the voltage supply line 22 to the power supply control circuit 7 is disconnected from the main battery 1, and the solar cell 20 is connected to the power supply control circuit 7. The solar cell 20 is installed on the surface of the housing of an electronic device such as a personal computer (not shown). In this configuration, the current consumed by the power supply control circuit 7 is supplied from the solar cell 20 and does not load the main battery 1. When an electronic device such as a personal computer is used, the power supply control circuit 7 is in an operating state by being supplied with a voltage by electric power obtained from indoor light or sunlight, and therefore, the state of the power ON / OFF switch 8 of the main body is monitored, It is possible to control the power supply to the load.

The solar cell 20 in this example may have an electromotive force sufficient to obtain the current and voltage supplied to the power supply control circuit 7. That is, the control circuit 9 in the power supply control circuit 7 can monitor the ON / OFF state of the main body power ON / OFF switch 8 by the electric power from the solar cell 20.
The solar cell 20 supplies electric power required for this monitoring operation, and as a result of this monitoring, the main body power ON / OFF switch 8 is changed to the ON state, so that the main battery 1 supplies electric power for a period of time. It suffices to supply sufficient power to perform the required operation of the device.

As described above, according to this embodiment, in the method of supplying the voltage to the power supply control circuit even when the main body power supply is cut off in the battery-driven electronic equipment, the power supply to the power supply control circuit is supplied from the main battery. It is characterized in that it is supplied from the solar cell without doing so.

According to this embodiment, since the voltage supply line to the power supply control circuit is separated from the main battery, the load on the battery can be reduced. In particular, when the power of the main body is turned off for a long period of several months, the consumption of the battery can be reduced, so that the operation time when the power of the main body is turned on can be extended.

Example 2. Further, as shown in FIG. 2, a rechargeable battery 22 or a charging unit 23 such as a capacitor is provided as a backup in parallel with the solar cell 20 and is charged by the solar cell 20 even at night when indoor light or sunlight is not obtained. Power is supplied to the power supply control circuit 7. This embodiment is effective for a power supply control circuit of an electronic device such as a personal computer that requires a resume operation such that a display such as a CRT is paused after a predetermined time has elapsed and a trigger is displayed again.

According to this embodiment, in addition to the effects of the first embodiment, the power of the charging unit connected in parallel with the solar cell supplies power to the power supply control circuit even at night when no room light or sunlight is obtained. Is supplied, the resume operation can be enabled.

Example 3. In FIG. 3, the main battery 1
Is a rechargeable battery, and the voltage supply line 22 to the power supply control circuit 7 is connected to the solar cell 21 and the main battery. The solar cell 21 may have an electric power supplied to the power supply control circuit 7 and an electromotive force sufficient to self-discharge the voltage detection circuit 6 and the main battery 1.

In this configuration, when the electronic device such as a personal computer is stopped, the solar cell 21 supplies the voltage value detection circuit 6 and the power supply control circuit 7 which require power even when the electronic device is stopped and the main battery 1 Since trickle charging to compensate for self-discharge is also performed, it is possible to extend the storage period in the stopped state without consuming the electric power of the main battery 1 and prevent deterioration of the main battery 1 due to over-discharge.

According to this embodiment, in addition to the effect of the second embodiment, the electromotive force of the solar cell compensates for the self-discharge of the battery, so that the deterioration due to the over-discharge of the battery can be prevented.

Example 4. In the above embodiment, the solar cell 20
Although only one is shown, a plurality of solar cells 20 may be provided if necessary. Further, the solar cell referred to here supplies electric power by photoelectric conversion, and does not have to be named as a solar cell, and a member that performs photoelectric conversion may be used.

[0027]

As described above, according to the present invention, a photoelectric converter such as a solar cell is connected to a power supply control circuit in a system in which a voltage is supplied to the power supply control circuit even when the main body power supply is cut off. With this configuration, not only the load on the battery when the power of the main unit is turned on is reduced, but also when the power of the main unit is turned off for a long period of several months, the battery is consumed and the rechargeable battery is not deteriorated due to over-discharge. I can do things. A photoelectric converter such as a solar cell is small in size because it requires only electric power required for the operation of the power supply control circuit unit, and the device is not large in size and is low in cost.

[Brief description of drawings]

FIG. 1 is a power supply circuit diagram showing an embodiment of the present invention.

FIG. 2 is a power supply circuit diagram showing another embodiment of the present invention.

FIG. 3 is a power supply circuit diagram showing another embodiment of the present invention.

FIG. 4 is a power supply circuit diagram showing a conventional power supply circuit.

[Explanation of symbols]

 1 main battery 2 DC / DC conversion circuit 3 load 4 load 5 transistor 6 battery voltage value detection circuit 7 power supply control circuit 8 main body power ON / OFF switch 9 control circuit 20 solar cell 21 solar cell 22 voltage supply line 23 charging section

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[Procedure amendment]

[Submission date] August 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Further, in order to completely disconnect these loads from the main battery, the main body power ON / OFF switch 8 may be arranged at the Y portion in the figure. In this case, the main body power ON
・ Because it is necessary to apply a large current to the contact of the OFF switch 8, the power switch size becomes large and the wiring material becomes thick.
The device cannot be downsized, and the main power is turned off.
However, there is a problem in that it cannot be applied to the application for supplying electric power to some loads (for example, the load 3 in FIG. 4) , that is, the resume operation.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

According to a first aspect of the present invention, there is provided a power supply system in which power supply to a power supply control circuit is disconnected from a main battery, and a photoelectric converter such as a solar cell is connected to the power supply control circuit. It supplies power to the power control circuit to reduce power consumption and life deterioration of the main battery.
It has the following elements. (A) A switch for turning on / off the power of the electronic device,
(B) A power supply control circuit for recognizing ON / OFF of the switch and controlling power supply to a load of an electronic device, (c) When the switch is ON, based on the control of the power supply control circuit A power supply that supplies electric power to the load of the electronic device, (d) ON / OFF of the above switch
Regardless, a photoelectric converter that supplies power to the power supply control circuit.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment in which power is supplied to a power supply control circuit by a solar cell, FIG. 2 is a view showing an embodiment in which the solar battery of FIG. 1 is provided with a buffer charging unit, and FIG. 3 is a power supply control circuit and It is a figure which shows the Example which connected the solar cell to the main battery. In the figure, 1 is the main battery, 2 is DC / DC
Conversion circuit (pulse width modulation PWM, detailed wiring is not shown), 3 and 4 are loads, 5 is a transistor, 6 is a battery voltage value detection circuit, 7 is a power supply control circuit, and 8 is a main power ON / OFF switch , 20 and 21 are solar cells, 2
2 is a voltage supply line to the power supply control circuit , and 23 is a charging unit such as a rechargeable battery or a capacitor. The power supply control circuit 7 has a control circuit 9 similar to that shown in FIG.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Embodiment 1. In FIG. 1, the voltage supply line 22 to the power supply control circuit 7 is disconnected from the main battery 1, and the solar cell 20 is connected to the power supply control circuit 7. The solar cell 20 is installed on the surface of the housing of electronic equipment such as a personal computer.
Placed (not shown). In this configuration, the current consumed by the power supply control circuit 7 is supplied from the solar cell 20 and does not load the main battery 1. When an electronic device such as a personal computer is used, the power supply control circuit 7 is in an operating state by being supplied with a voltage by electric power obtained from indoor light or sunlight, and therefore, the state of the power ON / OFF switch 8 of the main body is monitored, It is possible to control the power supply to the load.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

The solar cell 20 in this example may have an electromotive force sufficient to obtain the current and voltage supplied to the power supply control circuit 7. That is, the control circuit 9 in the power supply control circuit 7 can monitor the ON / OFF state of the main body power ON / OFF switch 8 by the electric power from the solar cell 20 .

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

As described above, in this embodiment, in the system in which the voltage is supplied to the power supply control circuit even when the main body power is cut off in the battery-driven electronic equipment, the power supply to the power supply control circuit is supplied from the main battery. It is characterized in that it is supplied from the solar cell without being supplied.

Claims (3)

[Claims] 1. A power supply system having the following elements: (a) a switch for turning on / off a power source of an electronic device,
(B) A power supply control circuit for recognizing ON / OFF of the switch and controlling power supply to a load of an electronic device, (c) When the switch is ON, based on the control of the power supply control circuit A power supply for supplying electric power to the load of the electronic device, (d) when the switch is OFF,
A photoelectric converter that supplies power to the power supply control circuit. 2. The power supply system according to claim 1, further comprising a storage battery which is connected in parallel to the photoelectric converter and which is charged by the photoelectric converter. 3. The power supply system according to claim 1, wherein the power source is a rechargeable battery connected in parallel with the photoelectric converter and charged by the photoelectric converter.