JP2003333747A - Power source device for electronic apparatus and method for controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the removal of a plug from an AC plug socket even in a standby. <P>SOLUTION: An AC input detector circuit 13 generates a potential difference at both ends of a resistor 12 by an infinitesimal current flowing to capacitors 1 and 2 having small capacitances and detects the generated potential difference. When the difference is detected, it is judged that the power of a commercial power source is supplied to the terminals T1 and T2. For example, a signal of a high level is supplied to a switch control circuit 14. When the difference is not detected, for example, a signal of a low level is supplied to the control circuit 14. In the circuit 14, a switch circuit 15 is turned on and off in response to the signal supplied from the detector circuit 13. The circuit 11 is connected to a terminal 11b. When the circuit 15 is turned on, the power from a secondary battery 16 is supplied to a remote control signal receiver circuit 17. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply apparatus for an electronic apparatus having an electronic circuit section that needs to operate in a standby state, such as a receiving section of a remote controller, and a control method therefor.

[0002]

2. Description of the Related Art At present, in order to reduce the power consumption of electronic equipment, the electronic circuit is put in a standby state by stopping the supply of electric power to the main circuit of the electronic equipment when the main circuit of the electronic equipment is not operating. There are many devices. In this standby state,
For example, when waiting for reception of a signal for operating the main circuit of the electronic device from the commander of the remote controller (hereinafter, referred to as “remote control”), or when power is supplied to the main circuit of the electronic device at a preset time. Then, there is a case where it waits until the main circuit of the electronic device is operated.

In order to suppress the power consumption in the standby state, a circuit that operates even in the standby state (hereinafter, referred to as
There is a circuit in which a "standby state operation circuit" is provided as a circuit different from the main circuit of the electronic device and only the standby state operation circuit is operated in the standby state.

Further, an electronic device for generating this standby power from a commercial power source and a power source section for outputting the standby power (hereinafter,
There is an electronic device provided with a "standby power supply unit"). At this time, the electronic device provided with the standby power supply unit can consume less power than the electronic device that generates standby power from the commercial power supply.

That is, when in the standby state, the standby state operation circuit and various elements provided between the standby state operation circuit and the commercial power supply for supplying electric power to the standby state operation circuit or the standby state operation circuit. Power is consumed by and. Generally, an electronic device that generates standby power from the power of a commercial power source is better than an electronic device that has a standby power supply unit.
Since many elements are provided up to the standby state operation circuit, more power is consumed.

Therefore, in order to suppress the power consumption in the standby state to a low level, the standby power supply unit is provided, and the power cutoff switch capable of cutting off the power input of the commercial power supply is provided where the power is not consumed as much as possible. There are electronic devices.

[0007]

However, when such an electronic device is in a standby state, for example, when a plug extending from the electronic device for supplying electric power from a commercial power source is disconnected from the AC outlet, The electronic device could not detect that the plug was unplugged from the AC outlet.

For example, when the main circuit of the electronic device is set to operate at a desired time in advance, the power cutoff switch is turned on to operate the main circuit at the desired time. Let At this time, since the commercial power is not supplied, it is detected that the plug extended from the electronic device is disconnected from the AC outlet.

Therefore, since the plug is unplugged from the AC outlet from the time when the plug is unplugged from the AC outlet until the desired time when the power cutoff switch is turned on, power is supplied to the main circuit of the electronic device. Therefore, even though the electronic device cannot be operated, the standby power supply unit consumes power to the standby state operation circuit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply device for an electronic device and a control method therefor capable of detecting that the plug is disconnected from the AC outlet even in the standby state.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 supplies an electric power to an electronic circuit section which is operating even in a standby state of an electronic device and an electronic circuit section. It has a power supply section, a switch means provided in a power supply path from the power supply section to the electronic circuit section, and an input detection means for detecting the presence or absence of an input power supply, and the input detection means does not supply the input power supply. When it is determined that the switch means is turned off, and when it is determined that the input power is being supplied, the switch means is turned on.

According to a fifth aspect of the present invention, an electronic circuit section that operates even when the electronic device is in a standby state, a power source section that supplies electric power to the electronic circuit section, and a power source section to the electronic circuit section are provided. A power supply device for an electronic device having a switch means provided in a power supply path and an input detection means for detecting the presence or absence of an input power supply, wherein the input detection means determines that the input power is not supplied. Further, in the method of controlling the power supply device of the electronic device, the switch means is turned off and the switch means is turned on when it is determined that the input power is supplied.

As described above, even in the standby state, it is possible to detect that the plug extended from the electronic device to which the electric power is supplied from the commercial power source is disconnected from the AC outlet. It is possible to stop the supply of electric power to the control means. Therefore, it is possible to save power in the power supply unit that supplies power to the control unit in the standby state.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a first embodiment to which the present invention is applied. The power of the commercial power supply, that is, the AC power is supplied through the terminals T1 and T2. The supplied alternating current power passes through the power cutoff switch circuit 3 and the diode 4 and the capacitor 5
Is supplied to the rectifier circuit composed of. In the rectifier circuit supplied from the diode 4 and the capacitor 5, the supplied AC power is rectified and output as DC power.

The output DC power is supplied to the primary winding L1 of the transformer 6. Primary winding L of transformer 6
1 is supplied with power, the secondary winding L2 of the transformer 6
An electromotive force is induced in. The induced electromotive force is supplied to the rectifier circuit including the diode 7 and the capacitor 8. In the rectifier circuit composed of the diode 7 and the capacitor 8, the electromotive force is rectified into stable DC power and output.

The voltage of the power output from the rectifying circuit composed of the diode 7 and the capacitor 8 is detected by the voltage detecting circuit 9. In the voltage detection circuit 9,
When it is determined that the detected voltage is equal to or higher than the predetermined voltage, for example, a high-level signal is supplied to the switch control circuit 10, and when it is determined that the detected voltage is less than the predetermined voltage, the switch is switched. For example, a low level signal is supplied to the control circuit 10.

In the switch control circuit 10, when a high level signal is supplied from the voltage detection circuit 9, a control signal for connecting the switch circuit 11 to the terminal 11a is sent to the switch circuit 1.
1 is supplied. In the switch control circuit 10, when a low level signal is supplied from the voltage detection circuit 9, a control signal for connecting the switch circuit 11 to the terminal 11b is supplied to the switch circuit 11.

When the switch circuit 11 is connected to the terminal 11a, the remote control signal receiving circuit 17 is supplied with the power output from the rectifying circuit composed of the diode 7 and the capacitor 8.

In this embodiment, the remote control signal receiving circuit 17 is an example of a standby state operation circuit for the sake of simplicity. The remote control signal receiving circuit 17 receives various control signals output from a remote controller (not shown) operated by the user, and outputs control signals to the corresponding circuit blocks so as to perform control according to the received control signals. To be done.

For example, when a signal for operating the electronic device or a signal for stopping the operation of the electronic device is output from the remote controller and received by the remote controller signal receiving circuit 17, the remote controller signal receiving circuit 17 sends the signal to the operating circuit 18, for example, high level. Signal is supplied. In the operation circuit 18, a signal is supplied to the control circuit 19 so as to switch the power cutoff switch circuit 3.

The control circuit 19 outputs a control signal to switch off when the power cutoff switch circuit 3 is on, and outputs a control signal to switch on when the power cutoff switch circuit 3 is off. . The power cutoff switch circuit 3 is turned on / off according to a control signal supplied from the control circuit 19. The power cutoff switch circuit 3 is turned on when power is supplied to the main circuit of the electronic device and the electronic device is operated, and when power supply to the main circuit of the electronic device is stopped and operation of the electronic device is stopped. That is, it is turned off to suppress power consumption in the standby state.

As described above, in the first embodiment, when the high-level signal is output from the remote control signal receiving circuit 17, the power cutoff switch circuit 3 is switched on and off alternately. The power cutoff switch circuit 3 may be turned on when a high level signal is output from the reception circuit 17, and the power cutoff switch circuit 3 may be turned off when a low level signal is output.

Here, in FIG. 1, a circuit is constructed in which the terminal T1 is connected to the terminal T2 via the capacitor 1, the resistor 12, and the capacitor 2. Then, an AC input detection circuit 13 is provided which detects whether or not the power of the commercial power supply is supplied from the terminals T1 and T2 based on the potential difference between both ends of the resistor 12. It should be noted that the AC input detection circuit 13 only needs to be able to determine whether or not the power of the commercial power supply is being supplied, and therefore the capacitors 1 and 2
May have a small capacity, for example. Thereby, the insulation standard can be observed. The connection point between the capacitor 1 and the resistor 12 is connected to the other end of the secondary winding L2 of the transformer 6.

In the AC input detection circuit 13, a minute current flowing through the capacitors 1 and 2 having a small capacitance causes
A potential difference is generated across the resistor 12, and the generated potential difference is detected. When the AC input detection circuit 13 detects the potential difference, it is determined that the commercial power supply is supplied from the terminals T1 and T2. That is, AC
In the input detection circuit 13, a voltage exceeding a predetermined voltage, for example, 0
When a potential difference exceeding V is detected, for example, a high level signal is supplied to the switch control circuit 14 so as to output a control signal for turning on the switch circuit 15, and a potential difference of a predetermined voltage or less, for example, 0V. When is detected, a low-level signal, for example, is supplied to the switch control circuit 14 so as to output a control signal for turning off the switch circuit 15.

In the switch control circuit 14, when a high level signal is supplied from the AC input detection circuit 13, a control signal for turning on the switch circuit 15 is supplied to the switch circuit 15, and the AC input detection circuit 13 outputs a low level signal. Is supplied, a control signal for turning off the switch circuit 15 is supplied to the switch circuit 15.

When the switch circuit 11 is connected to the terminal 11b and the switch circuit 15 is turned on, the remote control signal receiving circuit 17 is supplied with power from the secondary battery 16.
That is, it is a case where it is determined that the power cutoff switch circuit 3 is off and the plug extended from the electronic device is connected to the AC outlet. Specifically, since the power cutoff switch circuit 3 is off, the voltage detection circuit 9
In, it is determined that the power output from the rectifier circuit including the diode 7 and the capacitor 8 is less than a predetermined voltage, and the power of the commercial power supply is supplied via the terminals T1 and T2. Detection circuit 13
At, the potential difference between both ends of the resistor 12 is a predetermined voltage or more,
For example, when it is determined that the voltage exceeds 0V.

In this way, the power cutoff switch circuit 3 and
Whether or not the plug extended from the electronic device is connected to the AC outlet is determined one by one. Therefore, when the plug extended from the electronic device is disconnected from the AC outlet, the switch circuit 15 is immediately turned off. Therefore, it is possible to prevent wasteful consumption of the electric power of the secondary battery 16.

When the capacity of the secondary battery 16 becomes low, the plug extending from the electronic device is connected to the AC outlet and the power is supplied from the commercial power source. Is turned on, and the secondary battery 16 is charged. As described above, while the secondary battery 16 is being charged, the power supply to the main circuit of the electronic device can be stopped. Further, when the remote control signal receiving circuit 17 receives a signal for supplying power from the remote controller to the main body of the electronic device while the secondary battery 16 is being charged, the operation of the main body of the electronic device and charging of the secondary battery 16 are performed. And can be done at the same time.

In the first embodiment, the power cutoff switch circuit 3 is provided between the terminal T1 and one of the input terminals of the diode bridge 4, and the capacitor 1 is provided between the power cutoff switch circuit 3 and the terminal T1. Although one end is connected, the power cutoff switch circuit 3 is provided between the terminal T2 and the other input terminal of the diode bridge 4, and one end of the capacitor 2 is connected between the power cutoff switch circuit 3 and the terminal T2. You may be allowed to.

Now, the operation of the first embodiment will be described with reference to FIG. In step S1, the AC input detection circuit 13 detects whether or not the plug extended from the electronic device is connected to the AC outlet and power is input from the commercial power supply. In step S2,
If it is determined that the power from the commercial power source exceeds a predetermined voltage, for example, 0 V, that is, if it is determined that the plug is connected to an AC outlet based on the detection result, control is passed to step S4. If it is determined that the power from the commercial power source is equal to or lower than a predetermined voltage, for example, 0 V, that is, if the plug is disconnected from the AC outlet, the control proceeds to step S3. In addition, AC
Since the input detection circuit 13 detects one by one whether or not the plug is connected to the AC outlet, the detection control of step S1 is performed regardless of the correctness. Step S3
Then, the switch circuit 15 is turned off, and the power supply of the secondary battery 16 to the remote control signal receiving circuit 17 is stopped.
Then, the control returns to step S1.

In step S4, the voltage detection circuit 9 detects the power output from the rectifier circuit composed of the diode 7 and the capacitor 8. Step S5
Then, if it is determined that the power output from the rectifier circuit configured of the diode 7 and the capacitor 8 exceeds the predetermined voltage based on the detection result, the control proceeds to step S7, and the diode 7 and the capacitor 8 are controlled. If it is determined that the power output from the configured rectifier circuit is equal to or lower than the predetermined voltage, the control proceeds to step S6. In step S6, the switch circuit 11 is connected to the terminal 11b. Then, the control returns to step S4. Step S7
Then, the step circuit 11 is connected to the terminal 11a. Then, the control returns to step S1.

A second embodiment of the present invention will now be described with reference to FIG.
Will be described with reference to. In the second embodiment, the power cutoff switch circuit 21 is provided between the terminal T2 and the other input terminal of the diode bridge 4. A resistor 2 is provided between one and the other of the output terminals of the diode bridge 4.
4 and the capacitor 25 are provided in series. Between the connection point of the resistor 24 and the capacitor 25 and the other output terminal of the diode bridge 4, PWM (Pulse Widt
h Modulation) control circuit 26 is provided.

The base of the NPN transistor 27 is P
It is connected to the WM control circuit 26, its emitter is connected to the other output terminal of the diode bridge 4, and its collector is connected to the other end of the primary winding L1 of the transformer 29. One end of the primary winding L1 of the transformer 29 is connected to one of the output terminals of the diode bridge 4.

The cathode of the diode 28 is connected to the connection point of the resistor 24 and the capacitor 25, and the anode thereof is connected to one end of the tertiary winding L3 of the transformer 29. The other end of the tertiary winding L3 of the transformer 29 is connected to the other output terminal of the diode bridge 4.

The secondary winding L2 of the transformer 29 is connected to the rectifying circuit composed of the diode 7 and the capacitor 8. The secondary battery 16 is charged by the charging circuit 31 to which the electric power output from the rectifying circuit including the diode 7 and the capacitor 8 is supplied. Secondary battery 1
The power supplied from 6 to the remote control signal receiving circuit 17 is
It is supplied via the switch circuit 34.

Terminal T2 and power cutoff switch circuit 21
The capacitor 22 and the resistor 23 are provided in series between the space and the other end of the secondary winding L2 of the transformer 29. In the above-described first embodiment, the capacitors 1 and 2 are provided at both ends of the resistor 12 for detecting the potential difference, but in the second embodiment, one of these capacitors is removed. Specifically, the capacitor 22 is provided at one end of the resistor 23 for detecting the potential difference,
The distributed capacitance Cs of the transformer 29 is used at the other end.

As described above, the AC input detection circuit 13 for detecting whether or not the power of the commercial power source is supplied from the terminals T1 and T2 is provided based on the potential difference across the resistor 23. In the AC input detection circuit 13, a minute current flowing through the capacitor 22 causes a potential difference across the resistor 23, and the generated potential difference is detected. Based on the detected potential difference, it is determined that the power of the commercial power supply is supplied from the terminals T1 and T2. That is, in the AC input detection circuit 13, when a potential difference that exceeds a predetermined voltage, for example, 0 V is detected, to the battery discharge stop circuit 32, for example, a control signal for turning on the switch circuit 34 is output. When a high level signal is supplied and a potential difference of a predetermined voltage or less, for example, 0 V is detected, a low level signal is output to the battery discharge stop circuit 32 so as to output a control signal for turning off the switch circuit 34. Signal is supplied.

In the battery discharge stop circuit 32, the fact that a high level signal or a low level signal is supplied from the AC input detection circuit 13 is transmitted to the switching control circuit 33. In the switching control circuit 33, a control signal for turning on or off the switch circuit 34 is supplied to the switch circuit 34 according to the transmitted high level or low level signal. Further, the switching control circuit 33 is supplied with electric power from the secondary battery 16 so that it can be operated even in the standby state.

The remote control signal reception circuit 17 receives various control signals output from a remote control (not shown) operated by the user, and controls the corresponding circuit block to perform control according to the received control signal. The signal is output.

For example, when the remote control signal receiving circuit 17 receives a control signal output from the remote control and indicating whether or not to supply power to the main body of the electronic device, the remote control signal receiving circuit 17 returns to the feedback circuit 35. For example, a high level signal or a low level signal is supplied. In the feedback circuit 35, a signal is supplied to the control circuit 37 so as to switch the power cutoff switch circuit 21.

In the control circuit 37, when the power cutoff switch circuit 21 is on, a control signal is output to switch it off, and when the power cutoff switch circuit 21 is off, a control signal is output to switch it on. . The power cutoff switch circuit 21 is turned on / off according to a control signal supplied from the control circuit 37. The power cutoff switch circuit 21 is turned on when the main circuit of the electronic device is supplied with electric power to operate the electronic device, and when the main circuit of the electronic device is stopped from supplying electric power and the operation of the electronic device is stopped. That is, it is turned off to suppress power consumption in the standby state.

As described above, in the second embodiment, when the high-level signal is output from the remote control signal receiving circuit 17, the power cutoff switch circuit 21 is turned on / off.
Although switched alternately, the power cutoff switch circuit 21 is turned on when a high level signal is output from the remote control signal reception circuit 17, and the power cutoff switch circuit 21 is turned off when a low level signal is output. May be set.

Then, when the power cutoff switch circuit 21 is turned on, the control of the PWM control circuit 26 is started and electric power is output from the transformer 29. The power output from the transformer 29 is detected by the remote control signal receiving circuit 17. Then, a control signal is supplied from the remote control signal receiving circuit 17 to the operation control circuit 36 via the feedback circuit 35 so that the detected electric power has a desired voltage and current.

The operation control circuit 36 controls the operation of the PWM control circuit 26 based on the supplied control signal. The PWM control circuit 26 turns on / off the transistor 27.
By controlling the OFF duty ratio, the electric power output from the transformer 29 is stabilized to a desired voltage and voltage. Specifically, when it is determined that a voltage and a current smaller than the desired voltage and current are being output, the operation of the PWM control circuit 26 is controlled so that the ON time of the transistor 27 becomes longer, and the desired value is obtained. When it is determined that a voltage and a current larger than the voltage and the current are output, the on time of the transistor 27 is shortened,
The operation of the PWM control circuit 26 is controlled.

In this second embodiment, a control signal is supplied from the operation control circuit 36 to the PWM control circuit 26 via the feedback circuit 35, and the operation control circuit 36 outputs the control signal.
Although the operation of 6 is controlled, the operation may be controlled by directly supplying a control signal from the feedback circuit 35 to the PWM control circuit 26 without passing through the operation control circuit 36.

In the second embodiment, the capacitor 22
In the AC input detection circuit 13, a very small amount of electric current that can detect whether or not the power of the commercial power supply is supplied from the terminals T1 and T2 needs to flow, so that the capacity can be small. . Thereby, the insulation standard can be observed.

Now, a third embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. In the third embodiment, it is detected that the capacity of the secondary battery 16 has decreased and the switching control circuit 41 is operated to charge the secondary battery 16.

More specifically, when the remote control signal receiving circuit 17 receives a signal from a remote controller (not shown) in a standby state, the stop circuit 45 stops the operation of the switching control circuit 41 via the period circuit 35. . The switching control circuit 41 has the functions of the PWM control circuit 26 and the transistor 27 described above, and can stabilize the power output from the transformer 29 to a desired voltage and voltage.

Then, when the capacity of the secondary battery 16 is detected one by one in the remote control signal receiving circuit 17 and it is determined that the capacity of the secondary battery has decreased, the switching control circuit 41 is operated to generate stabilized power. It is output from the transformer 29. The secondary battery 16 is charged from the charging circuit 31 by the electric power output from the transformer 29.

Further, capacitors 42 and 44 provided at both ends of the resistor 43 are connected to the other end of the tertiary winding L3 and the other end of the secondary winding L2 of the transformer 29, respectively. By detecting the potential difference across the resistor 43 with the AC input detection circuit 13, it is determined whether the plug and the AC outlet are connected or disconnected.

Next, referring to FIG. 5, first and second modifications of the present invention will be described. Then, a first modified example is shown in FIG. 5A, and a second modified example is shown in FIG. 5B. First, a first modified example shown in FIG. 5A will be described. A resistor 51 is provided between the terminal T1 and the anode of the light emitting diode 52 of the photocoupler. The cathode of the light emitting diode 52 is connected to the terminal T2.

By thus providing the light emitting diode 52 of the photocoupler, it is possible to determine whether or not the power of the commercial power source is input. The switch circuit provided in the supply path for supplying the power of the secondary battery 16 to the remote control signal receiving circuit 17 is turned on / off via the photodiode of the photocoupler that detects the presence or absence of light emission of the light emitting diode 52. By controlling, the AC used in the first, second, and third embodiments described above
The same operation as the input detection circuit 13 can be obtained.

In the first modification, the electric power of the commercial power source supplied from the terminals T1 and T2, that is, the AC power is supplied to the light emitting diode 52, so that the light emission depends on the frequency of the commercial power source. Flashes.

Next, a second modification shown in FIG. 5B will be described. The anode of the diode 61 is connected to the terminal T1, and the resistor 62 and the capacitor 63 are provided between the cathode and the terminal T2. The anode of the light emitting diode 64 of the photocoupler is connected to the connection point of the resistor 62 and the capacitor 63, and the cathode thereof is connected to the terminal T2.

In the second modified example, as in the first modified example described above, by providing the light emitting diode 64 of the photocoupler, it is possible to determine whether or not the power of the commercial power source is input. The switch circuit provided in the supply path for supplying the power of the secondary battery 16 to the remote control signal receiving circuit 17 is turned on / off via the photodiode of the photocoupler that detects the presence or absence of light emission of the light emitting diode 52. By controlling, the above-mentioned first, second,
And AC input detection circuit 1 used in the third embodiment
An operation similar to that of No. 3 can be obtained.

In the second modified example, the commercial power supplied from the terminals T1 and T2, that is, the AC power, is rectified by the transistor 61 and the capacitor 63 and converted into the DC power. The light emission of the diode 64 is different from the above-described first modified example, and is lit while electric power is input from the commercial power supply.

The present invention is not limited to the above-described embodiments of the present invention and the like, and various modifications and applications are possible without departing from the gist of the present invention.

In this embodiment, the remote control signal receiving circuit 17 is used as an example of the standby state operation circuit, but any control circuit may be applied as long as it is the standby state operation circuit. For example, it may be a control circuit that turns on the power cutoff switch circuit upon detecting that a load is connected, or a timer circuit that counts date and time information.

In this embodiment, the secondary battery 16 is used as an example of the standby power supply section for supplying power to the remote control signal receiving circuit 17, but if the power can be charged, held and discharged, Any type may be used, and the same effect can be obtained even if a capacitor is used, for example.

[0060]

According to the present invention, it is possible to detect that the plug extended from the electronic device for supplying the electric power of the commercial power source is disconnected from the AC outlet even in the standby state. Therefore, when the plug is removed from the AC outlet, the power supply from the standby power supply unit to the standby state operation circuit can be stopped. Therefore, the power consumption in the standby state can be further suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an overall configuration of a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a block diagram for explaining an overall configuration of a second embodiment of the present invention.

FIG. 4 is a block diagram for explaining an overall configuration of a third embodiment of the present invention.

FIG. 5 is a block diagram for explaining an overall configuration of a modified example of the present invention.

[Explanation of symbols]

T1, T2 ... Terminals, 1, 2, 5, 8 ... Capacitor, 3 ... Power cutoff switch circuit, 4 ... Diode bridge, 6 ... Transformer, 7 ... Diode,
9 ... Voltage detection circuit, 10, 14 ... Switch control circuit, 11, 15 ... Switch circuit, 12 ... Resistor, 13 ... AC input detection circuit, 16 ... Secondary battery, 17 ... Remote control signal receiving circuit, 18 ... Operating circuit, 19 ... Control circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tamaki Ikeda             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5G065 AA01 DA06 DA07 EA02 EA06                       JA02 KA02 KA05 LA01 MA10                       NA09                 5H730 AA14 BB23 BB43 CC01 DD02                       EE02 EE07 FG01 XC00 XC20                       XX14

Claims (8)

[Claims] 1. An electronic circuit section that operates even in a standby state of an electronic device, a power supply section that supplies electric power to the electronic circuit section, and a power supply path from the power supply section to the electronic circuit section. It has a switch means provided and an input detecting means for detecting the presence or absence of an input power source, and when the input detecting means determines that the input power source is not supplied, turns off the switch means, A power supply device for an electronic device, wherein the switch means is turned on when it is determined that the input power is being supplied. 2. The power supply device for an electronic device according to claim 1, wherein the power supply unit is a rechargeable secondary battery. 3. The charging device according to claim 2, further comprising a charging means for charging the secondary battery, wherein the charging is performed when the capacity of the secondary battery becomes low. Power supply device for electronic equipment. 4. The electronic device according to claim 1, wherein the input detecting means is configured to detect the presence or absence of the input power source by utilizing a distributed capacitance of a transformer of a switching control power source section. Power supply. 5. An electronic circuit section that operates even when the electronic device is in a standby state, a power supply section that supplies electric power to the electronic circuit section, and a power supply path from the power supply section to the electronic circuit section. A power supply device for an electronic device having a switch means provided and an input detecting means for detecting the presence or absence of an input power source, wherein the input detecting means determines that the input power source is not supplied, A method for controlling a power supply device of an electronic device, wherein the switch means is turned off and the switch means is turned on when it is determined that the input power is supplied. 6. The method of controlling a power supply device of an electronic device according to claim 5, wherein the power supply unit is a rechargeable secondary battery. 7. A charging means for charging the secondary battery is further provided, and the switch means is turned on when the capacity of the secondary battery becomes low. Item 6
A method for controlling a power supply device for an electronic device according to. 8. The electronic device according to claim 1, wherein the input detecting means is configured to detect the presence or absence of the input power source by utilizing a distributed capacitance of a transformer of a switching control power source section. Power supply control method.