JP2000358203A - Power supply circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure safety and economy of an electric apparatus by providing a function of automatically turning off all power supplies including a standby power supply to the electric apparatus itself in a specific operating state considered not to be required by a user and bringing the power consumption in the specific operating state to nearly zero. SOLUTION: In an electric apparatus such as a television receiver with a main power switch 14-1 and a standby switch 5-1 adopting this power supply circuit, the main power switch 14-1 is turned on/off by using a motor 14-2, a microcomputer 9 being a control means drives the motor 14-2 of the main power switch 14-1 with the motor on the basis of a result of detection by a counter circuit 96 and a signal detection circuit 16 when they detect continuity of no operation or no signal or the like for a prescribed period (e.g. a long of 2 to 3 hours or over) in an operating state of the television receiver and the motor 14-2 exerts its torque to automatically turn off the main power switch 14-1. Or connecting a backup output power supply 17 to the microcomputer 9 turns on the main power switch 14-1 through remote control.

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 in an electric device having a main power switch and a standby switch, and capable of setting the device in a standby state, an operation state, or a stop state (all off).

[0002]

2. Description of the Related Art Conventionally, electric equipment such as a television receiver receives power supplied from a commercial AC power supply (hereinafter, referred to as an AC power supply, which is usually 100 V) through a main power supply switch and a standby switch. Some devices are configured to supply power to a main circuit in the device via the device. In such electric equipment, the main power switch is normally turned on to enable remote control operation (standby state), and when the main circuit is actually operated, the power switch of the remote control transmitter is operated to operate the standby switch. Is turned on to lead to an operating state.

FIG. 17 is a block diagram of a power supply circuit in a conventional electric device. Here, a case of a television receiver will be described.

In FIG. 17, an AC power supply voltage supplied from an AC plug 1 passes through a filter 2, and further passes through a main power supply switch 3 composed of an AC switch and a switch 5-1 of a relay 5 which is a standby switch. Full-wave rectifier 4-1
And a DC voltage rectified and smoothed by the first rectifier circuit 4 comprising the smoothing capacitor 4-2 and supplied to the main power supply circuit 6. The main power supply circuit 6 is composed of a stabilized power supply circuit such as a switch-type power supply circuit. The main power supply circuit 6 is stabilized to a predetermined DC voltage, and is supplied to the main circuit 7 as a power supply. The main circuit 7 includes a television receiving circuit including a video processing circuit and a deflection system circuit, and a picture tube (CR) to which a video processed video signal and a deflection processed deflection signal are supplied.
T).

On the other hand, a stand-by power supply circuit 10 is separately provided so that power can be turned on / off by the remote control transmitter 13 with the main power switch 3 turned on. The standby power supply circuit 10 includes a standby transformer 101 that converts the magnitude of the voltage of the AC power supply and guides the converted voltage to the standby circuit, a full-wave rectifier circuit 102-1 provided on the secondary side of the standby transformer 101, and a smoothing capacitor 102-. 2 and a stabilizing power supply circuit 103 for further stabilizing the rectified and smoothed DC voltage, and a control microcomputer computer requiring a control operation in a standby state. A stabilized power supply voltage Vcc for the microcomputer is supplied to 9 power supply terminals 91 (hereinafter referred to as a microcomputer). The microcomputer 9
In addition to a power supply terminal 91 for inputting a power supply voltage Vcc, an on / off terminal 92 for outputting an on / off signal to the standby switch 5, and a terminal 93 for inputting a remote control signal from the remote control transmitter 13 via the light receiver 12. And receives an on / off remote control signal from the remote control transmitter 13, for example, to turn on / off the terminal 9.
2 outputs a high-level signal or a low-level signal to the base of the transistor 11 for relay drive. When the transistor 11 is turned on or off by a high level signal or a low level signal, the standby switch AC
The drive current is supplied to the winding 5-2 of the relay 5 from the second rectifier circuit 102 in the standby power supply circuit 10, or the supply is cut off, so that the switch 5-1 of the relay 5 is turned on. Alternatively, the power supply can be controlled to be off, so that the power supply from the AC power supply to the main power supply circuit 6 can be turned on or off.

In the above configuration, the AC plug 1
Is connected to the AC power supply and the main power switch 3 is turned on.
The C power supply is supplied to the standby power supply circuit 10 through the filter 2, and the stabilized DC voltage Vcc for the microcomputer is supplied to the power supply terminal 91 of the microcomputer 9. At this time, in a state where the switch 5-1 of the relay 5, which is a standby switch, is off, the power is not supplied to the circuits 4, 6, and 7 after the first rectifier circuit 4. Thereafter, when the power key of the remote control transmitter 13 is pressed, an infrared code signal indicating that the power is turned on is input to the light receiver 12, and the microcomputer 9 decodes the code signal and outputs a high-level signal from the on / off terminal 92. I do. (Alternatively, a high-level signal is output from the on / off terminal 92 by pressing the power key of an operation switch (not shown) disposed on the main body of the receiver.) The relay drive transistor 11
Turns on and the winding 5-2 of the relay 5 from the standby power supply circuit 10
And the drive current flows to the reference potential point through the collector-emitter path of the transistor 11, and the switch of the relay 5
5-1 turns on. That is, the standby switch 5 is turned on, the power is supplied to the circuits 4, 6, and 7 after the first rectifier circuit 4, and the TV receiver is in the operating state.

In this operation state, when the power key of the remote control transmitter 13 is pressed again, a low level signal is output from the microcomputer 9 to the on / off terminal 92 to turn off the transistor 11, and the smoothing capacitor 103 is turned off. , The drive current supplied to the winding 5-2 of the relay 5 is cut off, and the switch 5-1 of the relay 5 is turned off, whereby the power supply from the AC power supply to the main power supply circuit 6 is turned off and the standby state is resumed. State.

[0008] Speaking of the above TV receiver,
When the AC plug 1 is connected to the AC power supply and the main power switch 3 is turned on, the power is turned on to the standby power supply circuit 10, and the DC power supply Vcc is supplied to the microcomputer 9 as the control means, and the system enters a standby state. The standby switch 5 turns on and off a main power supply of a main circuit unit (for example, a signal processing system and a deflection circuit system) 7 of the receiver. If the standby switch 5 is turned on in a standby state, the main circuit unit 7 is turned on. Can be operated to be in an operating state, normal viewing can be performed, and if the standby switch 5 is turned off, the operation of the main circuit section 7 of the receiver is stopped, and the minimum necessary circuit ( Only the microcomputer 9 and the remote control receiver 12 are operated, and the remote control transmitter 13 is operated.
Alternatively, the apparatus enters a standby state of waiting for an input from an operation key of the receiver main body. In this standby state, power supply to these circuits is turned off so as not to operate the main circuit section 7 and the main power supply circuit 6, so that there is an advantage that power consumption can be reduced. However, in the standby state, it is necessary to always supply the power supply voltage to the microcomputer 9 and the like that are waiting for the control, so that there is a problem that power consumption is accompanied to some extent. In addition, as the number of electric devices capable of performing a control operation in a standby state at home or the like increases, such a consumption amount of standby power cannot be ignored.

However, in order to completely reduce the power consumption by shutting down the main power switch of the TV receiver and bringing the device to a stop state (all-off), the user must go to the TV receiver and manually operate the TV receiver. The main power switch 3 had to be turned off. In order to operate the TV receiver again from the off state of the main power switch 3, the
It was necessary to go to the receiver and turn on the main power switch 3 manually.

For this reason, in an electric device such as a TV receiver which can be operated by a remote controller as described above, in an operating state or a standby state, various circuits and main circuits including a standby power supply circuit 10 and a microcomputer 9 in the main body of the device. When an abnormality occurs in the unit, the standby switch 5
However, the main power switch 3, which is a main power switch, must be turned off manually by going to the vicinity of the device body, which is inconvenient. In addition, when it is not necessary from the viewpoint of energy saving, the power consumption can be reduced to zero by turning off the main power switch 3, but the main power switch 3 can be turned off by manually turning off the main power switch 3 in the device body. I had to do it and it was troublesome. As described above, the AC power supply and the main power supply circuit can be separated only by an action intended by the user.

In the circuit shown in FIG. 17, the main power switch 3 of the TV receiver is set with the standby switch 5 turned off.
Is turned off, and then the main power switch 3 is turned on again so as to allow the TV receiver to be viewed again. The standby switch 5 must be turned on, and the electric device cannot be started up at once by turning on the main power switch 3.

Further, when a power failure occurs in the operation state or the standby state of the electric equipment, at least the main power switch 3 is kept turned on. Since the device returns to at least the standby state, at least the standby power supply circuit 10 and the microcomputer 9 are set to the operating state. For this reason, a power outage occurred in the electrical equipment, and the power outage was caused by a natural disaster such as an earthquake, and then the power outage was restored and the environment became dangerous for the operation of the electrical equipment, or the user was absent during the power outage. Then, even if the power failure recovers and the environment becomes useless even if the electric equipment operates, this cannot be completely avoided.

Further, in the conventional electric equipment, when the user erroneously inputs an AC voltage exceeding the rated voltage of the electric equipment (for example, when the electric equipment is rated at 200 V with respect to 100 V).
Main power switch 3)
When the standby power supply circuit 10 is turned on, an excessive AC voltage is applied to the standby power supply circuit 10 and the standby power supply circuit 10 may be destroyed. Even if the standby power supply circuit 10 withstands an excessive electric stress, the standby switch is turned on. 5 is applied, an excessive AC voltage is applied to the rectifier circuit 4 on the main power supply side and the like,
As a result, there is a problem that an excessive DC voltage is applied to the main power supply circuit 6 and the power supply circuit 6 is destroyed.

[0014]

As described above, in a conventional power supply circuit having a standby power supply, the standby power supply is always operating, and a microcomputer or the like which is a load during standby always consumes power. For example, there is a problem that power is consumed even in a specific operation state that is not required by the user, for example, when a broadcast signal ends and no signal is output.

Further, in the conventional electric equipment which can be operated by remote control, when the whole equipment is to be stopped (all off) in order to save power of the electric equipment in an operation state or a standby state, a main power switch is operated by remote control operation. Cannot be turned off, and for that purpose, the user must go to the main body of the device and turn off the main power switch, which is inconvenient. Further, when the main power switch is turned on from the stop state of the electric device, the device cannot be brought into the operating state at once. In addition, when a power failure occurs and subsequently recovers from the power failure, at least a part of the circuits of the electrical equipment is put into an operating state, and a dangerous environment for the electrical equipment to operate during the power failure or a power failure occurs. In the case where the user is absent during this time and the power failure recovers after that and the electrical equipment operates, the environment becomes useless, and there is no way to avoid this.

Furthermore, in the conventional electric equipment which can be operated by a remote controller, when an abnormality occurs in a standby power supply circuit, various circuits including a microcomputer, and a main circuit portion in an operation state or a standby state, this is detected. The main power switch could not be turned off automatically. Furthermore, there is a problem that if the user erroneously inputs an AC voltage exceeding the rated voltage of the device, the electric device may be destroyed.

In view of the above problems, the present invention has a function of automatically turning off all power supplies including a standby power supply in a specific operation state which is not considered necessary for a user. It is an object of the present invention to provide a power supply circuit which can have power, hardly consumes power in a specific operation state, and can ensure safety and economy.

According to the present invention, in an electric device having a main power supply circuit and a standby power supply circuit, the operability can be improved by setting the electric device in a stopped state (all off) by remote control operation. From the stop state of
When the main power switch is turned on, it is possible to put the equipment into an operating state at a stretch, and furthermore, the electrical equipment experiences an unexpected power outage, and the power outage is due to a natural disaster such as an earthquake, which is dangerous for the electrical equipment to operate. To provide a power supply circuit capable of ensuring safety by avoiding an environment in which a user is absent during a power outage and an electrical device is operated due to no user presence. It is assumed that.

Further, according to the present invention, in an electric device having a main power supply circuit and a standby power supply circuit, when an abnormality in the electric device is detected, the main power switch is automatically turned off and almost all circuit parts in the device are turned off. Operation of the electrical equipment can be stopped to keep the electrical equipment in a safe state, or if the user accidentally connects the electrical equipment to a power supply system that exceeds the rated voltage, damage to the electrical equipment due to misuse can be anticipated. It is an object of the present invention to provide a power supply circuit capable of preventing the occurrence of a power failure and ensuring safety.

[0020]

According to a first aspect of the present invention, there is provided a power supply circuit provided with a motor-equipped main power switch for turning on / off electric power supplied from a commercial power supply, and a power supply circuit provided downstream of the main power switch. A standby switch for turning on and off the power supply to the main power supply circuit, and a standby power supply circuit provided at a stage subsequent to the main power supply switch and for supplying necessary power to at least a control unit in the electric device during standby. A main power supply circuit provided at a stage subsequent to the main power switch and the standby switch, for supplying necessary power to a main circuit in the electric device based on commercial power,
At the time of operation of the electric device, a detection unit that detects that the electric device has continued a specific operation state for a predetermined period, and a control unit that operates based on a power supply from the standby power supply circuit, On / off control of the standby switch can be performed based on a key operation, and a main power switch with a motor can be driven based on a detection result of the detection unit or a key operation of an operation unit to operate a main power supply. Control means capable of turning off the switch.

According to the first aspect of the present invention, a control means such as a microcomputer in an electric device such as a television receiver,
When a specific situation in which the device does not need to be turned on continues for a predetermined period, the main power switch with the motor can automatically turn off the main power switch. This allows
Since the main power switch is turned off mechanically, no power is supplied to the circuits thereafter. Therefore, it is possible to create a situation where power is not consumed.

According to a second aspect of the present invention, in the power supply circuit according to the first aspect, the control means is provided with an automatic off operation of a main power switch with a motor based on a detection result of the detection means. -It is characterized by further comprising means for enabling release.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, it is possible for a user to set or cancel the circuit operation for automatically turning off the main power switch. Become. This is realized by storing "does" or "does not" for automatically turning off the main power switch in a storage means in the control means by a user operation.

According to a third aspect of the present invention, in the power supply circuit according to the first or second aspect, the detecting means comprises means for detecting the presence or absence of an operation signal from the operating means, and the control means comprises the detecting means. The main power switch is turned off when a signal indicating no operation signal is input from the means for a predetermined time.

According to a fourth aspect of the present invention, in the power supply circuit of the first or second aspect, the detecting means comprises means for detecting the presence or absence of a specific signal in the main circuit, and the control means comprises the detecting means. The main power switch is turned off when a signal indicating that there is no specific signal is input for a predetermined time from.

According to a fifth aspect of the present invention, in the power supply circuit according to the first or second aspect, when the electric device is a television receiver, the detecting means determines whether or not a television signal exists in the main circuit. The control means turns off the main power switch when a signal indicating no television signal is input from the detection means for a predetermined time.

According to a sixth aspect of the present invention, in the power supply circuit according to the first or second aspect, the electric device is a television receiver, and selects one of a television signal and an external signal. In the case of having the selection means, the detection means is constituted by means for detecting the presence or absence of an external signal in the main circuit when the mode selection means is in the external input mode, and the control means comprises the detection means The main power switch is turned off when a signal indicating that there is no external signal is input from the means for a predetermined time.

According to a seventh aspect of the present invention, there is provided a power supply circuit for turning on / off a power supplied from a commercial power supply, and turning on / off in conjunction with the main power switch to detect on / off of the main power switch. And a motor-type interlocking switch provided with a main power switch and a motor for turning on and off the second switch; and a power supply for a main power supply circuit provided at a stage subsequent to the main power switch. A standby switch for turning on and off the power supply, a standby power supply circuit provided at a stage subsequent to the main power switch, and capable of supplying necessary power to control means in the electric device based on commercial power during standby, Control means for operating based on power from a power supply circuit, wherein the main power switch is turned off at least in a standby state when the main power switch is turned off. Control means for storing the chief-off in the storage means, and controlling the standby switch to be turned on based on the stored contents of the storage means when the main power switch is next turned on, and The second switch is capable of turning on and off the supply of power from the standby power supply circuit to the main power switch off detection terminal of the control means, and at least when the main power switch is turned off during standby operation. Accordingly, a signal indicating that the main power switch has been turned off is supplied to the control means by turning off the second switch.

According to the seventh aspect of the present invention, at least when the main power switch is turned off in the standby state, a signal is sent to the control means by turning off the second switch, and the fact that the main power switch is turned off is stored. Then, when the main power switch is turned on next time, all the circuits in the electric device can always be brought into the operation state (power supply is turned on once) based on the stored contents. Since the on / off state of the main power switch is stored in a non-volatile storage means such as a microcomputer, there is no power consumption when the power switch is off, and the operation state is always on when the main power switch is on. In addition, when a power failure occurs in at least the standby state of the electric device and the power failure recovers after that, the standby state can be automatically set without setting the device to the operation state.

The power supply circuit according to the invention of claim 8 is a main power switch for turning on / off the electric power supplied from a commercial power supply, and turns on / off in conjunction with the main power switch to detect on / off of the main power switch. And a motor-type interlocking switch provided with a main power switch and a motor for turning on and off the second switch; and a power supply for a main power supply circuit provided at a stage subsequent to the main power switch. A standby switch for turning on / off the supply, a standby power supply circuit provided at a stage subsequent to the main power switch, and capable of supplying necessary power to control means in the electric device based on the commercial power during standby, A main power supply that is supplied with power from the commercial power supply via a power switch and the standby switch, and supplies power to a main circuit in the electric device; A motor drive circuit for turning off the main power switch by supplying a current to the motor of the motor type interlock switch based on the drive signal, and when the output voltage of the commercial power supply drops below a predetermined value, A power failure detection circuit that outputs a first detection signal indicating a possibility of a power failure based on an output potential of a standby power supply circuit, and a power failure detection circuit connected to the second switch of the motor type interlock switch; A switch open / close detection circuit that outputs a second detection signal indicating on / off of the main power switch according to on / off of the switch, and control means that operates based on a power supply from the standby power supply circuit. In this state, when the output voltage of the commercial power supply drops below a predetermined value, a first detection signal indicating the possibility of a power failure from the power failure detection circuit and the switch open. A power failure is determined based on a second detection signal indicating that the main power switch is turned on from the detection circuit, and the power failure is stored in the storage means, and when the power supply of the commercial power supply is started next, the storage contents of the storage means Control means for supplying a drive signal to the motor drive circuit based on the control signal so as to turn off the main power switch.

In the invention according to claim 8, the control means includes:
At least in a standby state, when the power supply of the commercial AC power supply AC has been lost for a certain period of time (at the time of a power failure), a power failure detection signal, which is a first detection signal indicating a possibility of a power failure from the power failure detection circuit, and a switch open / close state A power failure is determined based on a switch open / close signal, which is a second detection signal indicating that the main power switch is turned on from the detection circuit, and the power failure is stored in a storage unit in the control unit. At the start (when the power is restored), a drive signal is supplied to the motor drive circuit by referring to the contents stored in the storage means to control the main power switch to be turned off, and the entire electric device is brought into a stopped state. As a result, the electrical equipment suffered a power outage, and the power outage was caused by a natural disaster such as an earthquake, and then the power outage was restored and the environment became dangerous for the electrical equipment to operate, or the user was absent during the power outage and became absent. Even if the operation becomes useless, the motor-operated interlock switch is automatically turned off, and such a situation can be avoided.

According to a ninth aspect of the present invention, in the power supply circuit according to the eighth aspect, the power failure detection circuit includes a light emitting diode that emits light based on power supply from the commercial power supply, and a power supply from the standby power supply circuit. A phototransistor that operates based on the current, and through which a current corresponding to the amount of light from the light emitting diode flows, and which is connected in series with the phototransistor and converts the current value of the phototransistor into a voltage, and detects a power supply voltage of the commercial power supply. A resistor for outputting a signal as a signal, wherein the switch open / close detection circuit has an output terminal of the standby power supply circuit connected to one end of the second switch of the motor-operated interlock switch; A collector and a resistor are connected between the output terminal of the
The emitter is connected, turns on and off according to the base voltage,
A switching transistor that outputs a low level and a high level output to a collector as the second detection signal indicating on / off of the main power switch, and the other end of the second switch of the motor type interlock switch. A resistor and capacitor circuit provided between the reference potential points to apply a base voltage to the switching transistor based on power supply from the standby power supply circuit when the second switch is on; It is characterized by having.

The invention according to claim 10 is the invention according to claim 8 or 9
In the power supply circuit according to any one of the above, the control unit is capable of controlling the standby switch to be on / off based on a key operation of an operation unit, and the motor is controlled based on a key operation of an operation unit. The main power switch and the second switch can be turned off by supplying a drive signal to a drive circuit.

[0034] The invention described in claim 11 is the invention according to claim 8 or 9.
The power supply circuit according to claim 1, further comprising a backup power supply for control means, wherein the control means is operable based on the backup power supply, and controls on / off of the standby switch based on a key operation of an operation means. The main power switch and the second switch can be turned off by providing a drive signal to the motor drive circuit based on a key operation of an operation unit, and the main power switch and the second switch can be turned off. In a state where the second switch is turned off, it is possible to supply a drive signal to the motor drive circuit based on a key operation of an operation means to turn on the main power switch and the second switch. I do.

The twelfth aspect of the present invention provides the seventh to eleventh aspects.
In the power supply circuit according to any one of the above, the motor-type interlocking switch is turned on / off in conjunction with the main power switch for turning on / off commercial power, and detects on / off of the main power switch. A second switch for turning on the main power switch and the second switch when pressed once, and a manual operation unit for turning off the main power switch and the second switch when pressed once again; One end of the motor is connected to a DC power supply, the other end is connected to a transistor, and the transistor is turned on by the control means to supply a drive current to the motor, and the motor Means for mechanically turning on and off the main power switch by utilizing the above.

According to a thirteenth aspect of the present invention, there is provided a power supply circuit comprising:
A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power circuit for supplying power to a main circuit in the electric device, and a main power switch provided at a stage subsequent to the main power switch; A standby switch for turning on / off a power supply to a power supply circuit, a standby power supply circuit provided at a subsequent stage of the main power switch, and for supplying power to at least a control unit in the electric device during a standby operation; A detection circuit for detecting an abnormality of a circuit in the device, a means for applying a drive current to a motor of the main power switch with the motor based on the abnormality detection signal of the detection circuit to turn off the main power switch; A control unit that operates based on a power supply from a standby power supply circuit, and controls on / off of the standby switch based on a key operation of an operation unit. DOO in which is provided a control means possible.

According to a fourteenth aspect of the present invention, there is provided a power supply circuit comprising:
A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power circuit for supplying power to a main circuit in the electric device, and a main power switch provided at a stage subsequent to the main power switch; A standby switch for turning on / off a power supply to a power supply circuit, a standby power supply circuit provided at a subsequent stage of the main power switch, and for supplying power to at least a control unit in the electric device during a standby operation; A detection circuit for detecting an abnormality of a circuit in the device, a holding unit for holding the standby switch off based on a detection signal of the detection circuit, and an operation based on a power supply from the standby power supply circuit Control means for controlling on / off of the standby switch based on a key operation of an operation means, and a standby switch by the holding means. It is obtained and a control means capable of turning off the main power switch giving drive currents to the motor of the main power switch with the motor based on the off operation of holding switch.

In the fourteenth aspect of the present invention, the holding means may be constituted by, for example, a thyristor circuit using an SCR that performs a latch operation based on an abnormality detection signal.

According to a fifteenth aspect of the present invention, there is provided a power supply circuit comprising:
A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power supply circuit for supplying power to a main circuit in the electric device, and a main power switch provided at a stage subsequent to the main power switch; A standby switch for turning on / off power supply to a power supply circuit, a standby power supply circuit provided at a stage subsequent to the main power switch, and for supplying power to at least a control unit in the electric device during a standby operation; A detection circuit that detects an abnormality of a circuit in the device; and control means that operates based on a power supply from the standby power supply circuit, wherein on / off control of the standby switch is performed based on a key operation of an operation means. It is possible to apply a drive current to the motor of the main power switch with the motor based on the abnormality detection signal of the detection circuit, It is obtained; and a control means can be off.

According to the thirteenth to fifteenth aspects of the invention, when an abnormality in the electric equipment is detected, the main power switch is automatically turned off, and the operation of most parts in the equipment is stopped. In a safe state.

According to a sixteenth aspect of the present invention, there is provided a power supply circuit comprising:
A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power circuit for supplying power to a main circuit in the electric device, and a main power switch provided at a stage subsequent to the main power switch; A standby switch for turning on / off power supply to a power supply circuit, a standby power supply circuit provided at a stage subsequent to the main power switch, and for supplying power to at least a control unit in the electric device during a standby operation; A detection circuit for detecting an abnormality of a power supply voltage of a power supply or a standby power supply circuit, and a drive current supplied to a motor of the main power switch with the motor based on an abnormality detection signal of the detection circuit to turn off the main power switch. Current supply means, and control means which operates based on a power supply from the standby power supply circuit, wherein the standby means operates based on a key operation of an operation means. It is obtained and a control means capable of turning on and off the switch.

According to the sixteenth aspect of the present invention, when the input power supply voltage of the commercial AC power supply becomes abnormally high, for example, when the user erroneously connects the electric equipment to the power supply system exceeding the rated voltage, When this is detected, the main power switch is automatically turned off, so that the electric equipment can be prevented from being destroyed.

The seventeenth aspect of the present invention relates to the first to sixth aspects.
The power supply circuit according to any one of 13 to 16,
A backup power supply for control means, wherein the control means is operable based on the backup power supply, and in a state where the main power switch is turned off, the main power supply with motor based on a key operation of an operation means. The main power switch can be turned on by driving a switch motor.

According to the seventeenth aspect, the main power switch can be turned on and off by remote control operation. In the state where the main power switch is turned off, conventionally, the standby power circuit was also turned off and it was impossible to turn on the main power switch again by remote control operation. However, in the present invention, the main power switch is turned on again. When it is necessary to do so, the main power switch can be turned on by remote control operation without going to the vicinity of the device body.

The power supply circuit according to the eighteenth aspect of the present invention
A main power switch with a motor for turning on / off electric power input from a commercial power supply; a standby switch provided at a stage subsequent to the main power switch for turning on / off power supply to a main power supply circuit; A standby power supply circuit that is provided at a subsequent stage of the switch and supplies necessary power to at least the control unit in the electric device during a standby operation,
A control unit that operates based on a power supply from the standby power supply circuit. The control unit can control the standby switch to be turned on and off based on a key operation of an operation unit. Control means for driving the motor of the main power switch with the motor to turn off the main power switch.

According to the nineteenth aspect of the present invention,
The power supply circuit according to any one of 13 to 18, wherein
The main power switch with the motor includes a main power switch for turning on and off a power supply from a commercial power supply, and a manual operation unit for turning on the main power switch when pressed once and turning off the main power switch when pressed again. And a motor that rotates by the supply of a drive current. One end of the motor is connected to a DC power supply, the other end is connected to a transistor, and the transistor is turned on by the control means to supply a drive current to the motor. Means for turning on and off the main power switch mechanically using the rotating force of the main power switch.

[0047]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a power supply circuit according to a first embodiment of the present invention. Here, a block diagram of a power supply circuit of a television receiver is shown. The same parts as those in FIG. 17 are denoted by the same reference numerals. FIG. 2 shows a configuration example of the main power switch with a motor in FIG.

In FIG. 1, an AC plug 1 is connected to a commercial AC power supply (AC power supply), one line of the AC plug 1 is connected to one input terminal of a full-wave rectifier circuit 3 via a filter 2, and the other line. Is connected to the other input terminal of the full-wave rectifier circuit 4-1 via the switch 14-1 of the motor-equipped main power switch 14 and the switch 5-1 of the relay 5 via the filter 2. A first rectifier circuit 4 including a full-wave rectifier circuit 4-1 and a smoothing capacitor 4-2 outputs a rectified voltage obtained by rectifying and smoothing a commercial AC voltage. The rectified voltage is converted to a stabilized DC voltage by a main power supply circuit 6 composed of a stabilized power supply circuit such as a switching type power supply circuit, and supplied to a main circuit 7, here a portion including a television receiving circuit and a picture tube (CRT). Is done. The configuration of the main circuit 7 will be described later.

On the other hand, the AC power is supplied to the standby transformer 10 via the switch 14-1 of the main power switch 14 with the motor.
The power is supplied to a standby power supply circuit 10 including a first and second rectifier circuit 102 and a stabilized power supply circuit 103. The standby power supply circuit 10 rectifies and smoothes the AC obtained from the AC power supply, stabilizes the rectified voltage, converts the rectified voltage into a microcomputer power supply voltage Vcc, and outputs the converted voltage. Then, the standby power supply circuit 10
Is supplied to the power supply terminal 91 of the microcomputer 9 as the control means.

The output terminal of the second rectifier circuit 102 comprising the full-wave rectifier circuit 102-1 and the smoothing capacitor 102-2 in the standby power supply circuit 10 is connected to one end of the winding 5-2 of the relay 5, and The other end of line 5-2 is transistor 1 for relay drive
The transistor 11 is connected to a reference potential point via one collector-emitter path, and the base of the transistor 11 is connected to an on / off terminal 92 of the microcomputer 9 as control means. Microcomputer 9
The light receiving device 12 is connected to the terminal 93 of the microcomputer 9 so that an operation signal such as infrared rays can be input to the microcomputer 9 from a remote control transmitter 13 as an operating means. Alternatively, an operation signal can be input to the microcomputer 9 by an operation switch (not shown) provided in the receiver main body.

One end of the motor 14-2 in the motor-equipped main power switch 14 is connected to the output terminal of the standby power supply circuit 10, and the other end of the motor 14-2 is connected to the collector-emitter path of the motor drive transistor 15. The base of the driving transistor 15 is connected to a main on / off terminal 94 of the microcomputer 9 which is a control means.

The main circuit 7 is operable by receiving power supply from the main power supply circuit 6 and has an antenna terminal 71.
Mode selection switch 73 for selecting one of a television (TV) signal from an external device and an external signal (for example, a signal from a VTR) from an external input terminal 72, and a signal from the mode selection switch 73 to a video signal processing. A video processing circuit 74 that performs (reproduction of a video signal, separation of a synchronization signal, and the like)
And a deflection system circuit 75 for inputting a synchronization signal from the video processing circuit 74 to generate horizontal and vertical deflection scanning signals, and a picture tube (CRT) for displaying the video signal from the video processing circuit 74 using the deflection scanning signal. ) 76 are provided.

The video signal from the video processing circuit 74 is supplied to the cathode of a picture tube (CRT) 76, and the synchronizing signal is a signal detection circuit 16 for detecting the presence or absence of a television signal.
Supplied to The detection result of the signal detection circuit 16 is supplied to a detection terminal 95 of the microcomputer 9. The mode selection switch 73 can be selectively switched to one of the input signals based on a switching signal from the microcomputer 9 which is a control means. The switching signal is output from the microcomputer 9 based on the operation of the mode switching key of the operation switch of the remote control transmitter 13 or the receiver.

The microcomputer 9 serving as control means is made operable by supplying a DC voltage Vcc from a standby power supply circuit 10 to its power supply terminal 91, and comprises a CPU serving as arithmetic processing means and a program memory. A ROM, a RAM serving as a data memory, a continuation time (ie, no signal time) in which the signal detection circuit 16 detects the absence of an external input signal or a television signal, and the remote control transmitter 13
And at least a timer circuit 96 for measuring a continuation time (ie, a non-operation time) of no operation by the operation means such as an operation means. The input terminal 93 has a light receiver 12 for receiving a remote control signal from the remote control transmitter 13. Is connected,
It is possible to output a high-level or low-level signal to the on / off terminal 92 based on the operation of the power key of the operating means such as the remote control transmitter 13 to control the relay 5 on and off. In the embodiment, when a specific signal, for example, a synchronization signal is not detected for a predetermined period (for example, a long time of 2 to 3 hours or more) based on the detection result of the signal detection circuit 16, or a mode selection is performed based on the detection result of the signal detection circuit 16. When no signal (for example, after VTR reproduction ends) continues for a predetermined time while the switch 73 is in an external input state,
Further, when there is no input from the operation means 13 for a predetermined time, a high-level signal is output to the main ON / OFF terminal 94 to turn on the motor drive transistor 15, thereby turning on the motor-equipped main power switch 14. The drive current is supplied to the motor 14-2 to switch the main power switch 14
-1 can be controlled to be turned off, and a high-level signal is output to the main on / off terminal 94 based on the operation of a main power key (described later) provided on the operation means 13. By turning on the motor drive transistor 15, the motor 14 of the main power switch 14 with motor is turned on.
-2 main power switch with motor by applying drive current to
It is possible to perform control to turn off the switch 14-1 of No. 4.

Further, in the present embodiment, the backup power supply 17 is connected to the power supply terminal 91 of the microcomputer 9, and the switch 14-1 of the motor-equipped main power switch 14 is operated based on the operation of the main power key of the remote control transmitter 13. Can be turned on by remote control. That is, even if the switch 14-1 of the main power switch 14 with the motor is turned off as described above and the AC power supply is completely cut off (off), the main power supply of the operation means such as the remote control transmitter 13 is turned off. By operating the key, the microcomputer 9 receives the command and outputs a high-level signal to the main ON / OFF terminal 94 to turn on the motor drive transistor 15 and to turn on the motor 14- of the main power switch 14 with motor. (2) A drive current is applied to turn on the switch 14-1 of the main power switch 14 with the motor, thereby canceling the complete cut-off (off) state of the AC power supply and returning the electric device to the standby state again. I have.

The switch 14-1 of the motor-equipped main power switch 14 can be manually turned on and off by the manual operation section 14-3.

Further, the microcomputer 9 is provided with nonvolatile storage means for storing whether the automatic power-off operation of the motor-equipped main power switch 14 is "ON" or "OFF" based on the detection result of the signal detection circuit 16. Thus, it is possible to set / cancel whether or not to perform the automatic off operation according to the user's request.

In the present embodiment, in addition to various keys (including a power key) required for TV viewing operation, a remote control transmitter 13 or an operation switch of the receiver main body, which is an operation means, has a motor-equipped main switch. A main power key for turning off and on the power switch 14 by remote control operation is provided. Further, an automatic off setting / cancellation key for enabling setting / cancelling of the operation of automatically turning off the main power switch may be provided.

As described above, in order to enable the main power switch to be automatically turned off or turned on and off by remote control operation, the present embodiment employs a main power switch 14 with a motor as shown in FIG.

As shown in FIG. 2, the motor-equipped main power switch 14 has a main power switch 14-1, a motor 14-2, and a manual operation part 14-3, and pushes the manual operation part 14-3. By doing so, the main power switch 14-1 can be turned on and off, and when the switch 14-1 is in an on state (dotted line in the figure), a current flows through the motor 14-2 to turn off the switch 14-1. (Solid line in the figure). The motor 14-2 uses the rotational force to move the switch 14-1 to turn it off. As the switch 14-1 turns off, the manual operation unit 14-3 also returns to the off position.

The manual operation section 14-3 is, for example, of a push-push type, which is turned on and locked when pushed once, and unlocked and turned off when pushed next time. ON / OFF of the main power switch 14-1
It can be performed by manual operation of the manual operation unit 14-3, and can be turned on and off by rotation of the motor 14-2.

One end of the motor 14-2 is connected to the output terminal (voltage source 5V) of the standby power supply circuit 10, and the other end is connected to the transistor 1
5 is connected to a reference potential point through the collector-emitter path of the transistor 5. By supplying a high-level main power switch-off voltage from the microcomputer 9 to the base of the transistor 15, the transistor 15 is turned on. A coil current flows from the power source to the reference potential point side through the coil in the motor 14-2 and the transistor 15, and the motor
The switch 14-1 is turned off by the torque of 14-2.

Next, an example of the configuration for turning on / off the main power switch 14-1 by the rotational force of the motor 14-2 and the operation thereof will be described.
This will be described with reference to FIGS.

The motor 14-2 is connected between a power supply terminal (5V) and a reference potential point (earth) as shown in FIG.
A cam switch 14-4 and a motor drive transistor 15 are connected in parallel to a ground terminal of 14-2.

First, the cam switch 14-4 is off,
When a start signal (pulse) is supplied to the base of the transistor 15, conduction between the collector and the emitter is established, and the motor 14-2 is turned on.
Rotates. When the switch SW of the cam switch 14-4 is turned on for a while, the motor 14-2 continues to rotate even when the start signal to the transistor 15 is released. SW turns off.

The cam switch 14-4 can be constituted by using, for example, an eccentric cam that rotates with the rotation of the motor 14-2. As shown in FIG. Configuration. Cam (CA
When M) rotates to a predetermined position, the switch SW is turned on by pressing the switch SW as shown in FIG.
After passing through the top of, it is turned off as shown in FIG. 4 (b).

As described above, a push-push switch can be used as the main power switch 14-1, and the switch 14-1 can be pushed by manual operation. Using the switch 14-1
You can also push Here, in order to push the switch 14-1 using the rotational movement of the motor 14-2, the rotational movement is converted into a linear movement until the cam switch 14-4 is turned off as shown in FIG. Various transmission means such as a transmission means 14-5 for pushing the switch 14-1 using the linear motion can be used.

It should be noted that the signal detection circuit 16 detects the absence of a signal,
The main power switch 14-1 is turned off after the main power switch 14-1 is turned off based on detecting the non-operation state of the operation means such as 3 or operating the main power key of the remote control transmitter 13. In order to shift to the on state, the manual operation section 14-3 of the main power switch 14 with a motor described above is pressed to turn on the switch, or the microcomputer 9 is operated by the main power key of the operation means such as the remote control transmitter 13 or the like. Turn on 14-2 to switch on. At this time, the manual operation unit 14
-3 also shifts from the off position to the on position at the same time.

Next, the operation and effect of the embodiment of FIG. 1 will be described. By pressing the manual operation unit 14-3 of the main power switch 14 with the motor and turning on the switch 14-1, or pressing the main power key of the operation means such as the remote control transmitter 13 and rotating the motor 14-2, the switch 14- When the main power switch is turned on by turning on 1, an AC voltage is supplied from the AC power supply to the standby power supply circuit 10, where rectification and smoothing and stabilization are performed. Is supplied with a microcomputer DC voltage Vcc. At this time, the switch 5-1 of the relay 5 is still off, and the circuits 4, 6, and 7 after the first rectifier circuit 4 are in a standby state in which power is not turned on.

After that, when the power key (this is not the main power key) of the operation means 13 is pressed, a signal indicating that the power is turned on is input to the microcomputer 9, and the microcomputer 9 decodes the signal and outputs the signal to the on / off terminal. A high-level signal is output to 92, the transistor 11 for relay drive is turned on, and the switch 5-1 of the relay 5, which is a standby switch, is turned on.
As a result, the power is turned on to the circuits 4, 6, 7, and 8 after the first rectifier circuit 4, and the TV receiver enters an operating state.

As described above, the TV receiver can be set to the operation state. In this operation state, when the operation signal is inputted from the main power key of the operation means 13 or when the signal detection circuit 16 detects the operation signal. When the synchronization signal is not detected for a predetermined period (for example, a long time of 2 to 3 hours or more) based on the result, or when the mode selection switch 73 is in an external input state and there is no signal (after the end of the VTR reproduction signal) for a predetermined time. Or when there is no operation signal from the operation means 13 even after a predetermined time has elapsed, the microcomputer 9 as the control means outputs a high-level signal to the main ON / OFF terminal 94,
The motor drive transistor 15 is turned on to supply a drive current to the motor 14-2 of the main power switch 14 with a motor, and the cam switch 14-4 and the transmission means 14- provided together with the motor 14-2 are rotated by the rotation force. By operating 5, the control for turning off the main power switch 14-1 is performed. At this time, the manual operation unit 14-3 also returns from the ON position to the OFF position at the same time.

In this embodiment, a high-level signal is output to the main on / off terminal 94 based on the operation of the main power key provided on the operation means 13, and the transistor 15 is turned on.
Is turned on, and the motor 14-2 of the main power switch 14 with a motor is turned on.
Main power switch 14 with motor by applying drive current
Can be controlled to turn off and on the switch 14-1. When the switch 14-1 is turned off and on, the manual operation unit 14-3 can be simultaneously shifted to the off position and the on position.

According to the above operation, (1) when no operation is continued for a long time, the main power switch with the motor is automatically operated to stop the supply of AC power to devices such as a receiver. it can.

(2) When the device is not performing the main purpose of circuit operation (for a TV receiver, receiving a broadcast and outputting sound or images) (for a TV receiver, the broadcast time is over, etc.). (For example, when there is no signal) for a certain period of time, the main power switch with motor can be automatically operated to stop the supply of AC power to the device.

(3) When the device is a TV receiver, if there is no signal in the external input mode and a certain period of time has elapsed, the main power switch with motor is automatically operated to stop the supply of AC power to the device. be able to.

(4) The main power switch with the motor can be operated to stop or restart the supply of AC power to the device by remote control by the user using the remote control transmitter.

Therefore, in a device operation state that is not necessary for the user, the AC power supply of the electric device can be cut off to prevent unnecessary power consumption and danger from being generated by the electric device, and the user must be away for a long time. In such a case or in the event of a disaster, it is possible to easily turn off and on the AC power by remote control using a remote control transmitter or the like.

Further, in the embodiment of the present invention, the microcomputer 9 determines whether or not the automatic power-off operation of the motor-equipped main power switch 14 based on the detection result of the signal detection circuit 16 is "ON" or "OFF". Thus, the automatic off operation can be set / released as desired by the user.

When it is desired to turn on the main power switch 14 with the motor after turning off the main power switch 14, the user may manually press the manual operation unit 14-3 to turn on the main power switch 14.

As described above, according to the first embodiment, the main power switch for turning on and off the AC power supply is provided with the motor for turning it off, and the motor is turned on and off based on the signal from the microcomputer 9 as the control means. By enabling power supply, the main power switch can be turned off and on by the user's remote control operation, or the main power switch will be The switch can be turned off automatically.

FIG. 6 is a block diagram showing a power supply circuit according to the second embodiment of the present invention. 1 are given the same reference numerals. FIG. 7 shows a configuration example of the motor-operated interlocking switch in FIG.

FIG. 6 is different from FIG. 1 in that the main power switch with motor 14 (main power switch) shown in FIG.
14-1, a motor 14-2 and a manual operation unit 14-3), a main power switch 21-1 and a second switch 21-2 and a motor 21-3 for detecting ON / OFF of the main power switch. And a motor-operated interlocking switch 21 having a manual operation unit 21-4 and
One end of the second switch 21-2 is connected to the output terminal of the standby power supply circuit 10, and the other end of the second switch 21-2 is connected to the main power switch off detection terminal 100 of the microcomputer 9. And that the signal detection circuit 16 in FIG. 1 has been deleted. The main power switch 21-1 and the second switch 21-2 are configured to turn on and off in conjunction with each other.

Hereinafter, the configuration of FIG. 6 will be described. The AC plug 1 is connected to the AC power supply, one line of the AC plug 1 is connected to one input terminal of the first rectifier circuit 2 via the filter 2, and the other line is further connected to the motor type via the filter 2. The main power switch 21-1 of the switch 21 and the switch 5-1 of the relay 5 are connected in series to the other input terminal of the first rectifier circuit 4. A rectified voltage obtained by rectifying and smoothing the commercial AC is output from the first rectifier circuit 4. The rectified voltage is converted into a stabilized DC voltage by a main power supply circuit 6 composed of a stabilized power supply circuit such as a switching type power supply circuit, and supplied to a main circuit 7 composed of a receiving circuit of the TV receiver. The configuration of the main circuit 7 is the same as that shown in FIG. 1, and the demodulated or externally input video signal and deflection signal are displayed on a picture tube (CRT).

On the other hand, AC power is supplied to the standby power circuit 10 via the main power switch 21-1. In the standby power supply circuit 10, the AC power supply voltage is supplied to the primary winding of the standby transformer 101, and the output of the secondary winding is supplied to the full-wave rectifier circuit 102-.
1 and a smoothing capacitor 102-2, and supplies the rectified output to a stabilized power supply circuit 103 including a switching power supply circuit. The stabilizing power supply circuit 103 stabilizes the rectified voltage from the second rectifier circuit 102 and converts the rectified voltage into a microcomputer power supply to output. Then, the output voltage V of the standby power supply circuit 10
cc is supplied to a power supply terminal of the microcomputer 9 which is a control means.
The output stage of the stabilized power supply circuit 103 includes a smoothing capacitor. Therefore, when the main power switch 21-1 is turned off, the output voltage Vcc of the standby power supply circuit 10 does not immediately drop to zero but slowly decreases with a certain time constant.

The output terminal of the second rectifier circuit 102 is connected to one end of the winding 5-2 of the relay 5, and the other end of the winding 5-2 is connected to the collector-emitter of the transistor 11 for driving the relay. Connected to the reference potential point,
Is connected to the on / off terminal 92 of the microcomputer 9. A light receiver 12 is connected to a terminal 93 of the microcomputer 9 so that the light receiver 12 can receive a remote control signal such as infrared light from a remote control transmitter 13 which is an operation means.

Further, the output voltage V of the standby power supply circuit 10
cc to the second switch 21-2 of the motor-operated interlock switch 21.
The main power switch off detection terminal 10 of the microcomputer 9 through the
0 is supplied.

The motor 21-3 in the motor type interlock switch 21
Is connected to the output terminal of the standby power supply circuit 10 as a power supply, the other end of the motor 21-3 is connected to the reference potential point via the motor drive transistor 15, and the base of the transistor 15 Connected to main off terminal 94.

The microcomputer 9 serving as control means includes a power supply terminal 91 for inputting a power supply voltage Vcc from the standby power supply circuit 10 and a relay 5 serving as a standby switch for setting the TV receiver to an operation state or a standby state. An on / off terminal 92 for turning on and off the power supply, and a main power supply generated by turning off the second switch 21-2 when the main power switch 21-1 is turned off at least when the TV receiver is in a standby state. A main power switch off detection terminal 100 for detecting a switch off detection signal is provided, and a control signal for turning off the main power of the TV receiver based on an operation of a main power key provided on the remote control transmitter 13 is provided. A main off terminal 94 for outputting is provided. In the microcomputer 9, the voltage Vcc supplied to the power supply terminal 91 is compared with the voltage Vsw supplied to the main power switch off detection terminal 100, and the comparison result (low level when Vsw <Vcc, Vsw = Vcc Storage means (not shown) for storing the high level at the time of. This storage means is non-volatile so as to be able to store and hold the comparison result (detection result such as the OFF state of the main power switch 21-1) even when the power supply voltage Vcc of the microcomputer 9 is at the zero level, that is, when the TV set is all off. It is composed of a non-volatile memory.

The microcomputer 9, which is a control means, receives power Vcc from the standby power supply circuit 10, outputs a relay on / off signal from the terminal 92 based on the operation of the power key of the remote control transmitter 13, and operates the standby switch. A certain relay 5 can be controlled to be turned on and off, and a motor-on signal is output from a terminal 94 based on the operation of the main power key provided on the remote control transmitter 13 to turn on the drive transistor 15 to operate the interlock with the motor. It is possible to control the main power switch 21-1 and the second switch 21-2 to be turned off by applying a drive current to the motor 21-3 of the switch 21.

The remote control transmitter 13 as an operation means includes:
In addition to various keys (including a power key) required for the TV viewing operation, in the present embodiment, a main power key for turning off the motored interlock switch 21 by remote control operation is provided.

As described above, the present embodiment employs the motor-type interlock switch 21 as shown in FIG.

As shown in FIG. 7, the motor-type interlocking switch 21 has switches 21-1, 21-2, a motor 21-3, and a manual operation unit 21-4. Switch by pressing
21-1 and 21-2 can be turned on and off in conjunction with each other. When the switches 21-1 and 21-2 are on (solid line in the figure), the motor 21
By passing a drive current through -3, the switches 21-1 and 21-2 can be turned off (dotted line in the figure) in conjunction with each other. The motor 21-3 uses the rotational force to switch 21-1 and 21-2.
Is turned off mechanically. As the switches 21-1 and 21-2 are turned on and off, the manual operation unit 21-4 also moves to the on and off positions. The specific configuration of the motor-type interlock switch 21 is the same as the configuration described with reference to FIGS.

One end of the motor 21-3 is connected to a power supply voltage (for example, Vc
c) and the other end is connected to the collector of transistor 15
The transistor 15 is turned on by supplying a high-level voltage to the base of the transistor 15 through the emitter path, thereby turning on the transistor 15, whereby the reference potential point is supplied from the DC power supply through the motor 21-3 and the transistor 15. The switches 21-1 and 21-2 can be turned off in conjunction with the rotational force of the motor 21-3.

When the main power switch and the second switches 21-1 and 21-2 are turned off by the operation of the main power key of the remote control transmitter 13 (or the operation of the manual operation section 21-4), these switches 21 In order to turn on -1 and 21-2, the manual operation section 21-4 of the above-described motor-operated interlocking switch 21 may be pressed and turned on.

Next, the operation of this embodiment shown in FIG. 6 will be described. By pressing the manual operation part 21-4 of the motor type interlock switch 21, the main power switch and the second switch 21-1,
When the power supply 21-2 is turned on, the AC power is supplied to the standby power supply circuit 10, and the microcomputer power supply voltage Vcc is supplied from the standby power supply circuit 10 to the power supply input terminal 91 of the microcomputer 9 requiring the standby operation. At this time, the switch 5-1 of the relay 5, which is a standby switch, is still off, and the circuits 6, 7 after the first rectifier circuit 4 are in a standby state in which power is not turned on.

After that, when the power key of the remote control transmitter 13 is pressed, an infrared code signal indicating that the power is turned on is received.
1, the microcomputer 9 decodes the code signal and sets the on / off terminal 92 to high level. As a result, the collector-emitter of the relay drive transistor 11 is turned on, a drive current flows from the output terminal of the second rectifier circuit 102 to the reference potential point through the winding 5-2 of the relay 5, and the switch 5 of the relay 5 is turned on. 1 turns on. That is,
When the standby switch 5 is turned on, power is turned on to the circuits 6 and 7 after the first rectifier circuit 4, and the TV receiver enters an operating state.

As described above, the TV receiver can be set to the standby state and the operating state. In any of the standby state and the operating state, when the main power key of the remote control transmitter 13 is pressed, the key is pressed. Is input to the light receiver 12, the microcomputer 9 decodes the signal and sets the main off terminal 94 to a high level. As a result, the collector and emitter of the motor drive transistor 15 are turned on, and a current flows from the output terminal of the standby power supply circuit 10 to the reference potential point through the motor 21-3 of the motor type interlock switch 21. Rotates, and switches 21-1 and 21-2 are turned off by the rotation force. At this time, the manual operation unit 21-4 also returns to the off position at the same time.

As described above, when the interlock switch 21 is turned off from the on state, the second switch 21-2 is turned off at the same time as the main power switch 21-1 is turned off. Second switch 21
By turning off -2, the detection signal Vsw at the detection terminal 100 of the microcomputer 9 becomes low level. However, the power supply voltage Vcc from the standby power supply circuit 10 remains as shown in FIG. Since the charge of the smoothing capacitor included in the standby power supply circuit 10 remains, the voltage V
cc maintains a voltage required as a power supply for a certain period (shown by hatching in the figure). The power supply Vcc slowly falls with a certain time constant by a capacitor included in the power supply circuit 10. As shown in FIG. 8B, while the detection signal Vsw is at the low level and the power supply voltage Vcc is holding the voltage, the microcomputer 9 determines whether the signal level Vsw of the detection terminal 100 and the voltage level Vcc of the power supply terminal 91 are low. Make a comparison and Vsw <Vcc
At this time, the fact that the switch 21 has been turned off (ie, the fact that the detection signal Vsw has dropped to a low level) is stored in the nonvolatile storage means in the microcomputer 9. Thereby, when the power supply voltage Vcc rises next time when the manual operation section 21-4 of the switch 21 is pressed, the microcomputer 9 refers to the storage contents (Vsw is low level) of the storage means and, based on this, turns on / off the power supply. The OFF terminal 92 is set to a high level, and the switch 5-1 of the relay 5, which is a standby switch, is turned on so that the receiver is always in an operating state (this is called a power-on-on function).

That is, when the main power switch 21-1 is turned off at least in a standby state of the TV receiver, the second switch
By turning off 21-2, a low-level detection signal Vsw is supplied to the terminal 100 of the microcomputer 9, and the microcomputer 9 stores that the main power switch 21-1 has been turned off. When turned on, the TV receiver can always be in the operating state.

The same applies to the case where the main power switch 21-1 is turned off while the TV receiver is operating, and the TV receiver is always in the operating state when the main power switch 21-1 is turned on next time. be able to.

As described above, in both the standby state and the operating state of the TV receiver, the main power switch can be turned off by the remote control operation, and the operability can be improved. When the main power switch is turned on again after turning off the TV, the TV receiver can always be brought into the operating state. In addition, since the AC power is turned off by turning off the main power switch, power consumption can be reduced to zero.

Further, in the circuit shown in FIG. 6, when a power failure occurs when the TV receiver is in an operation state or a standby state (when the interlocking switch 21 is on), and when the power failure recovers thereafter, the TV receiver receives Is always in a standby state, so that safety and economy when no user is present can be ensured.

Next, a case where a power failure occurs will be described with reference to FIG. In FIG. 6, when a power failure occurs in a standby state (when the switch 21 is on and the relay 5 is off), the switches 21-1 and 21-2 remain on. Vcc decreases as shown in FIG. 9 (a) because the charge of the smoothing capacitor in the standby power supply circuit 10 gradually decreases. At this time, the second switch 21
Since the detection voltage Vsw supplied to the terminal 100 of the microcomputer 9 through -2 also changes in the same manner as the voltage Vcc of FIG. 9A as shown in FIG. 9B, the microcomputer 9 compares Vsw with Vcc. Is performed, since Vsw = Vcc, the microcomputer 9 outputs the voltage Vsw
It cannot be detected that it has decreased (becomes low level) as compared with cc, and Vsw = high level is stored in the storage means in the microcomputer 9. Therefore, the power failure recovers (the power failure recovery is detected by the microcomputer when Vsw rises).
And the microcomputer 9 turns on / off terminals 92 based on the stored contents.
Is set to low level, the transistor 11 for relay drive is not turned on and the switch 5-1 of the relay 5 is not turned on, and the TV receiver enters a standby state after recovery from power failure. From the operation in FIG. 9, when a power failure occurs in the standby state, particularly when the viewer is away, a power failure occurs, and when the power is restored, the electric device such as the TV receiver is in an operating state even if no one is present. There is no danger of being left for a long time.

The timing chart shown in FIG. 9 shows that when the TV receiver is in the operating state or the standby state (ie, when the switch 21 is turned on), the AC plug 1 is unplugged, and then the AC plug 1 is switched to the AC power supply again. The same applies when connected.

FIG. 10 is a block diagram showing a power supply circuit according to the third embodiment of the present invention. 6 are given the same reference numerals.

In FIG. 10, the AC plug 1 is connected to an AC power supply, one line of the AC plug 1 is connected to one input terminal of the first rectifier circuit 4, and the other line is a motor type interlock switch 21. It is connected to the other input terminal of the first rectifier circuit 4 via the main power switch 21-1 and the switch 5-1 of the relay 5. A rectified voltage obtained by rectifying and smoothing the commercial AC is output from the first rectifier circuit 4. The rectified voltage is converted into a stabilized DC voltage by a main power supply circuit 6 composed of a stabilized power supply circuit such as a switching type power supply circuit and supplied to a main circuit 7 of the electric device.

The motor type interlock switch 21 includes two switches (contacts) 21-1, 21-2, a motor 21-3, and a manual operation unit 21-4.
The opening / closing operation (on / off) of the two switches 21-1 and 21-2 is linked. Of the two switches 21-1, 21-2, the first switch 21-1 is a main power switch for opening and closing the AC line, and the second switch 21-2 is the main power switch 21.
-1 Used for open / close detection. Motor type interlock switch 21
Then, the user can open and close (turn on / off) the two switches 21-1 and 21-2 using the manual operation unit 21-4.
When the two switches 21-1 and 21-2 are in the closed state (ON), the two switches 21-1 and 21-2 are opened (OFF) based on the rotational force generated by applying a drive current to the motor 21-3.
I can do it. If the backup power supply 17 (indicated by a two-dot chain line) is connected to the power supply terminal 91 of the microcomputer 9, after the two switches 21-1 and 21-2 are turned off, the remote control transmitter 13 is turned off again. When the main power key is operated, the microcomputer 9 is operable with the backup power supply, so that the microcomputer 9 drives the motor drive circuit 20 to rotate the motor 21-3 to turn on the two switches 21-1 and 21-2. be able to.

On the other hand, AC power is supplied to the standby power circuit 10 via the main power switch 21-1. The standby power supply circuit 10 includes a standby transformer 101, a second rectifier circuit 102 connected to an output terminal of a secondary winding thereof, and a switching type power supply circuit that stabilizes and outputs the rectified and smoothed output. And a power supply circuit 103. The output voltage Vcc of the standby power supply circuit 10 is supplied to a power supply terminal 91 of the microcomputer 9 as control means, and is supplied to a power failure detection circuit 18, a switch opening / closing circuit 19, a motor drive circuit 20, and a motor 21-3 to be described later. Each is supplied as a power supply voltage.

Further, the output terminal of the standby power supply circuit 10 is connected to one end of the winding 5-2 of the relay 5, and the other end of the winding 5-2 is connected to the collector-emitter path of the transistor 11 for relay drive. Connected to the reference potential point. The base of the transistor 11 is connected to an on / off terminal 92 of the microcomputer 9, and a relay on / off signal S1 is supplied from the microcomputer 9 to the base. A light receiver 12 is connected to the microcomputer 9.
Thus, a remote control signal such as an infrared code is received from a remote control transmitter 13 as an operation means, and is supplied to the microcomputer 9 as a remote control electric signal S0.

The power failure detection circuit 18 includes a photocoupler P
C1 and resistors R1, R2 and R3, and the photocoupler PC1 is composed of a light emitting diode PD and a phototransistor PT. The AC power supply voltage passed through the filter 2 and the motor-type interlock switch 21 is supplied to both ends of a series circuit including a resistor R1, a light emitting diode PD, and a resistor R2. The output voltage Vcc of the standby power supply circuit 10 is supplied to the collector of the phototransistor PT, the emitter of the phototransistor PT is connected to the reference potential point via the resistor R3, and the main power switch 21-1 is turned on. Current, a current flows through the light emitting diode PD, and a current flows through the phototransistor PT depending on the degree of light emission.
The detection voltage generated at both ends of the resistor R3, that is, at the emitter of the phototransistor PT, is used as an AC detection signal S2 by the microcomputer 9
Is supplied to the detection terminal 97.

Further, the transistor Q1, the resistors R4, R
5 and a switch open / close detection circuit 19 composed of a capacitor C5. Switch open / close detection circuit 19
Detects the opening and closing of the main power switch 21-1 of the motor-type interlock switch 21 by detecting the opening and closing of the second switch 21-2. The output terminal (voltage Vcc) of the standby power supply circuit 10 Is connected to the reference potential point in series through the resistor R4 and the collector-emitter path of the transistor Q1, while the reference is connected in series through the second switch 21-2 of the motor type interlock switch 21, the resistor R5 and the capacitor C5. It is connected to a potential point, and the connection point between the resistor R5 and the capacitor C5 is connected to the base of the transistor Q1. The collector output of the transistor Q1 in the switch open / close detection circuit 19 is supplied to the switch open / close detection terminal 98 of the microcomputer 9 as a switch open / close signal S3 as a second detection signal. The switch open / close signal S3 is a low level signal when the transistor Q1 is turned on when the motor type interlock switch 21 is turned on.

One end of the motor 21-3 of the motor type interlock switch 21 is connected to the power supply Vcc obtained from the output terminal of the standby power supply circuit 10, and the other end of the motor 21-3 is connected to the motor drive circuit 2
0 is connected to the main on / off terminal 94 of the microcomputer 9. The motor drive circuit 20 connects the output Vcc of the standby power supply circuit 10 to the base of the transistor Q3 via the emitter-collector path of the transistor Q2 and the resistor R6 in series, and connects the resistor R7 between the emitter and the base of the transistor Q2. And connect the base of the transistor Q2 to the resistor R8.
To the main on / off terminal 94 of the microcomputer 9 via
The collector of the transistor Q3 is connected to one end of the motor 21-3, and the emitter is connected to the reference potential point.

A motor on / off signal S4 is supplied from the main on / off terminal 94 of the microcomputer 9 to the motor drive circuit 20. For example, the transistors Q2 and Q3 are turned on by the low level motor on signal S4 to turn on the motor 21-3. When the drive current is supplied from the standby power supply circuit 10 to rotate, the switches 21-1 and 21-2 which have been in the ON state are rotated.
Can be turned off, or the switches 21-1 and 21-2 that have been off can be turned on.

The microcomputer 9 serving as the control means operates by being supplied with the power supply voltage Vcc from the standby power supply circuit 9. If the microcomputer 9 is operating, the remote control transmitter 13
The standby relay 5 can be controlled to be turned on and off based on the operation of the power key of the remote control transmitter 13.
The motor drive circuit 20 is driven based on the operation of a main power key provided on the
-3 drive current to the main power switch 21-1 and the second
If the backup power supply 17 is connected to the power supply terminal 91 of the microcomputer 9 when the switch 21-2 is turned off, the device is stopped (the interlocking switch 21 is off).
The motor drive circuit 20 is driven based on the operation of the main power key of the remote control transmitter 13, and the motor-type interlock switch 2 is
Main power switch by applying drive current to motor 21-3
21-1 and the second switch 21-2 can be turned on from the off state.

The microcomputer 9 operates the main circuit 7 of the electric device in an operation state or a standby state while the motor type interlocking switch 21 is turned on in addition to the power supply terminal 91 to which the power supply voltage Vcc is supplied from the standby power supply circuit 10. A relay on / off signal S for turning on and off the standby relay 3 to bring it into a state
1 is provided, an on / off terminal 92 for outputting 1 is provided, a power failure detection terminal 97 for receiving a power failure detection signal S2 from the power failure detection circuit 18 is provided, and a switch for detecting on / off of the main power switch 21-1 is further provided. An open / close detection terminal 98 is provided. Further, when the electric device is in an operation state or a standby state, the entire electric device is completely turned off by turning off a main power switch 21-1, or the electric device is stopped (all off). ), A main ON / OFF terminal 94 for outputting a motor drive signal for turning on the main power switch 21-1 is provided. This main on / off terminal 9
The microcomputer 9 outputs a motor drive signal to the microcomputer 4. The motor drive signal is normally at a high level when the electric device is in an operation state or a standby state. When the microcomputer 9 is forcibly turned off or on based on the
When it is turned off automatically, it is set to low level.

In the microcomputer 9, the voltage between both ends of the resistor R 3 when a voltage expected to cause a power failure is reached from the power failure detection circuit 18 to the power failure detection terminal 97 (ie, a signal indicating “possibility of a power failure”) And the switch open / close detection circuit 19
When a low-level signal indicating “the main power switch is closed” is supplied to the switch open / close detection terminal 98 from
A storage unit (not shown) is provided for determining that the state is “power failure” and storing the determination result. This storage means is preferably constituted by a non-volatile memory so that the judgment result can be stored and held even when the power supply voltage Vcc of the microcomputer 9 is at the zero level, that is, when the electric device is in the all-off state. However, when the backup power supply 17 is connected to the power supply terminal 91 of the microcomputer 9 and used, the memory need not be a nonvolatile memory.

[0117] The remote control transmitter 13 as the operation means includes:
In addition to the various keys (including the power key) required for various operations of electrical equipment, a main power key is provided for turning the main power switch 21-1 off and on with the remote control of the aforementioned electrical equipment. Have been.

As the motor-type interlock switch 21, the same switch as that shown in FIG. 7 is used.

Next, the operation of this embodiment shown in FIG. 10 will be described. When electric equipment is normally used (for example, a program is viewed on a television receiver), the motor-type interlock switch 2
By closing 1, the standby power supply circuit 10 operates,
An output potential Vcc is generated and supplied to the microcomputer 9. As a result, the microcomputer 9 is in the operating state, and the microcomputer 9 can control the electric devices. In this state, the relay 5 is still off, and the circuits 4, 5, 6, and 7 after the first rectifier circuit 4 are in a standby state in which power is not turned on.

Next, when the user presses the power key of the remote control transmitter 13, the microcomputer 9 supplies a relay control signal to the transistor 11 for relay drive, and turns on the relay 5, which is a standby switch. As a result, the AC power supply becomes the first
Is rectified by the rectifier circuit 4 and supplied to the main power supply circuit 6, and the main power supply circuit 6 operates to supply necessary electric power to each part of the electric equipment. This state is the operation state of the electric device.

Here, the operation of the switch open / close detection circuit 19 will be described. The switch open / close detection circuit 19 detects the open / close state of the main power switch 21-1 using the second switch 21-2 for detecting the main power switch open / close of the motor type interlock switch 21. 4 (or the main power key of the remote control transmitter 13), the resistor R5 is turned on while the second switch 21-2 is closed.
, A base current flows through the transistor Q1 to turn on the transistor Q1 and transmit the low level of the switch open / close signal S3 to the open / close detection terminal 98 of the microcomputer 9. Conversely, the second
When the switch 21-2 is closed, the manual operation unit 21-4 is operated (or the main power key of the remote control transmitter 13 is operated).
By doing so, when the second switch 21-2 is open,
The transistor Q1 is turned off, and the switch opening / closing signal S3 is at the high level of the potential Vcc via the resistor R4 (this means that the standby power supply circuit 1
The voltage Vcc does not immediately fall because the smoothing capacitor within 0 is charged) is transmitted to the open / close detection terminal 98 of the microcomputer 9. And this second
The microcomputer 9 records a high-level signal obtained by opening the switch 21-2, and the operation of the electric device is stopped.

Then, the next time the manual operation section 21-4 is operated (or the main power key of the remote control transmitter 13 is operated), the main power switch 21-1 and the second switch 21-2 are closed and the electric equipment is turned off. Starts operating, the microcomputer 9 determines that the electric device has stopped normally with reference to the high-level signal. Then, based on the high level signal, the microcomputer 9 sets the relay on / off signal to a high level, transmits the signal to the transistor 11 for relay drive, closes the switch 5-1 of the relay 5, and guides the electric device to an operating state (steady operation) at a stretch. . (That is, if the switch opening / closing signal S3 is at the high level when the electric equipment is stopped, the microcomputer 9 records this, and when the motor type interlock switch 21 is turned on again,
By forcibly closing the relay 5, the electric device can be operated in a steady state at a stretch. This is a so-called one-shot power-on function. )
Next, the operation of the power failure detection circuit 18 will be described. In the power failure detection circuit 18, the current flowing through the light emitting diode PD and the phototransistor PT is connected by a certain-constant transfer function. A current flows through the light emitting diode PD on the primary side of the photocoupler PC1 via the resistors R1 and R2, and the current value is proportional to the AC voltage. Secondary-side phototransistor P
Since the current value is transmitted to T by a certain function, the current value of the secondary-side phototransistor PT is also proportional to the AC voltage.
The current value transmitted to the secondary side is converted into a voltage by the resistor R3 and transmitted to the microcomputer 9 as an AC voltage detection signal S2. That is, the AC voltage detection signal S2 changes in proportion to the change in the AC voltage, and the information is transmitted to the microcomputer 9.

When the AC voltage falls below the operation guarantee range of the electric device and reaches a voltage expected to cause a power failure, the microcomputer 9 determines that “there is a possibility of a power failure” based on the voltage value detected by the resistor R3.
Is programmed in the microcomputer 9 so as to judge. The detection voltage at this time is defined as Va.

Further, a problem may occur in practical use if an electric device is stopped by a power failure (called instantaneous power failure) for a very short time of, for example, 1 second or less. Only when the value is equal to or less than the value Va, the microcomputer 9 is programmed in advance to determine that “there is a possibility of a power failure”. Further, the switch open / close detection circuit 1 is used to determine whether the AC voltage has dropped due to the power failure or the user has opened the main power switch 21-1 and the second switch 21-2.
The switch open / close signal S3 transmitted from the switch 9 is detected, and when the signal is at a low level (switch closed), it is determined that a power failure has occurred. That is, the microcomputer 9 outputs the AC voltage detection signal S2
A certain time or more and Va or less, and the switch opening / closing signal S
Only when 3 is at the high level, it is determined that a power failure has occurred, and the result of this determination is stored.

The microcomputer 9 storing the "power failure" recovers from the power failure and the AC power supply starts to supply power to the electric equipment. When the standby power supply 10 of the electric equipment operates, the microcomputer 9 sets the motor drive signal S4 to low level and sets the motor drive circuit. 20 is operated to supply a current to the motor 21-3 of the motor-type interlocking switch 21 to open the main power switch 21-1 and the second switch 21-2 to stop the operation of the electric device. As a result, the electrical equipment suffered a power outage, and the power outage was caused by a natural disaster such as an earthquake, and the environment became dangerous for the electrical equipment to operate, or the user was absent during the power outage and the electrical equipment started operating. However, in a situation where the environment is wasteful, the AC power supply to the electric device can be cut off immediately after the recovery from the power failure to avoid a dangerous or wasteful situation.

As described above, regardless of whether the electric equipment is in the standby state or the operating state, when the main power switch is turned off after the main power switch is turned off, the electric equipment must be brought into the operating state without fail. In addition, the main power switch can be turned on and off by remote control operation, thereby improving operability. Moreover, power is not consumed because the AC power is turned off by turning on and off the main power switch.

Further, in the circuit of FIG. 10, when a power failure occurs when the electric device is in the operating state or the standby state (when the interlock switch 21 is on), it is detected that the power supply is turned off due to the power failure. When the power failure recovers after that, at least the standby power supply circuit and the microcomputer operate. However, based on the memory (that the power failure occurred), the microcomputer supplies a drive current to the motor, and
1 can be released (turned off) and the operation of the entire electric device can be stopped. This allows the electrical device to be in an operating state or a standby state when the environment becomes dangerous for the operation of the electrical device when the power failure recovers, or when the electrical device does not need to be operated when the user recovers from the power failure. , And the safety and economy of electrical equipment can be ensured.

FIG. 11 is a block diagram showing a power supply circuit according to a fourth embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 11 differs from FIG. 1 in that FIG.
Is provided with a detection circuit 22 for detecting an abnormality in the main circuit 7 in place of the signal detection circuit 16 for detecting the presence or absence of a television signal, and the relay drive transistor 11 is turned off based on the abnormality detection signal. , And as a result, a thyristor circuit 23 for turning on the motor drive transistor 15 and turning off the main power switch 14-1 is further provided. In order to turn off the main power switch 14-1 when a device abnormality is detected, the present embodiment employs the main power switch 14 with a motor as described with reference to FIGS.

An overcurrent detection circuit 22 is connected to the main circuit 7. When the current flowing through the main circuit 7 exceeds a predetermined value, this is detected as an abnormality, and the abnormality detection signal is sent to a thyristor as a holding means. Thyristor (S) in circuit 23
Transfer to the CR) gate. The thyristor circuit 23 includes a resistor R11, an anode of the thyristor SCR, between the output terminal of the stabilized power supply circuit 103 in the standby power supply circuit 10 and a reference potential point.
The cathode and the resistor R13 are connected in series, the resistor R12 is connected between the gate and the cathode, and the connection point between the cathode of the thyristor SCR and the resistor R13 is connected to the base of the switching transistor Q11. Are connected to the base of the transistor 11 for relay drive, and the emitter of the transistor Q11 is connected to the reference potential point. The thyristor circuit 23 has the SC
When the overcurrent detection signal is applied to the gate of R, the SCR turns on and Q1 turns on to operate, and the base of the transistor 11 for relay drive (that is, the on / off terminal 92 of the microcomputer 9) is connected to the reference potential point. As a result, when an overcurrent flows through the main circuit 7, even if it is temporary, the relay drive transistor 11 is forcibly held off by the latch operation of the thyristor circuit 23 (that is, the relay which is a standby switch). 5 is fixed to OFF), the power supply to the circuits 6 and 7 after the first rectifier circuit 4 is stopped, and the ON / OFF terminal 92 of the microcomputer 9 is set to low level at the same time. Therefore, at this time, the microcomputer 9 outputs a high-level signal to the main off terminal 94 based on the fact that the terminal 92 has gone low. As a result, a high-level signal is supplied to the base of the transistor 15 for motorized drive, the transistor 15 is turned on, a drive current flows through the motor 14-2, and the main power switch 14-1 is turned off. Therefore, since the main power switch 14-1 is turned off, in addition to stopping the power supply to the circuits 6 and 7 after the first rectifier circuit 4, the power supply to the standby power supply circuit 10 and the microcomputer 9 is also performed. Stopped.

The microcomputer 8, which is a control means, operates by being supplied with a power supply voltage Vcc from the standby power supply circuit 10, and operates as a standby switch based on an operation of a power supply key of the remote control transmitter 13. 5 can be turned on and off, and in the present embodiment,
When the on / off terminal 92 goes low due to the operation of the thyristor circuit 23 based on the abnormality detection, a high-level signal is output to the main on / off terminal 94 to turn on the motor drive transistor 15 and turn on the main power supply. Control for turning off the switch 14-1 can be performed. Note that a main power key is provided on the remote control transmitter 13, and the microcomputer 9 is turned on / off based on a user operation of the main power key.
By outputting a high-level signal to the off terminal 94,
It is also possible to apply a drive current to the motor 14-2 of the motor-equipped main power switch 14 via the motor drive transistor 15 to rotate the motor 14-2 and turn on / off the main power switch 14-1. However, in order to turn on the main power switch 14-1 by turning on the main power key of the remote control transmitter 13 after the main power switch 14-1 is turned off, the backup power supply 17 (indicated by a two-dot chain line) is connected to the power terminal 91 of the microcomputer 9. It is necessary to keep.

[0132] The remote control transmitter 13 which is an operation means includes:
In addition to various keys (including a power key for turning on and off the main power circuit 6) necessary for operating the electric equipment, a main power key for turning on and off the main power switch 14 with the motor by a remote control operation by a user is provided.

FIG. 12 shows an example of the overcurrent detection circuit 22. In FIG. 12, the overcurrent detection circuit 22
Connects a current detecting resistor R11 in series with, for example, a power supply line of the main circuit 7, connects one end a of the resistor R21 to the emitter of the PNP transistor Q21 via the resistor R22,
The other end b of the transistor 21 is connected to the base of the transistor Q21 via the resistor R23, the capacitor C21 is connected in parallel between the emitter and the base of the transistor Q21, and the collector of the transistor Q21 is connected to the SCR gate in the thyristor circuit 23. Configuration.

The circuit operation shown in FIG.
When 1 exceeds a predetermined value, the voltage drop of the resistor R21 increases, the transistor Q21 turns on, and current flows through the emitter and collector of Q21. This current is used as an overcurrent detection signal in the SCR
The SCR is turned on, the SCR is turned on, and the on state is held until the power supply voltage Vcc decreases to a holding current or less, and the switching transistor Q11 is set to the on state by the base voltage generated across the resistor R13. become.

Next, the operation of the fourth embodiment shown in FIG. 11 will be described. Manual operation section of main power switch 14 with motor
When the main power switch 14-1 is turned on by pressing 14-3 or pressing the main power key of the remote control transmitter 13, the AC power is turned on.
The second rectifier circuit 102 from the power supply via the standby transformer 101
An AC voltage is supplied to the power supply, rectified and smoothed.
Is supplied with a microcomputer power supply voltage Vcc. At this time, the switch 5-1 of the relay 5, which is a standby switch, is still off, and the circuits 6, 7 after the first rectifier circuit 4 are in a standby state in which power is not turned on.

After that, when the power key of the remote control transmitter 13 is pressed, an infrared code signal indicating that the power is on is received.
The microcomputer 9 decodes the code signal and changes the on / off terminal 92 from a low level (off) to a high level (on). The high level turns on the relay drive transistor 11. As a result, a drive current flows from the plus output terminal of the second rectifier circuit 102 in the standby power supply circuit 10 through the winding 5-2 of the relay 5 to the reference potential point through the collector-emitter path of the transistor 11, and the relay 5 Switch 5-1 turns on.
That is, the standby switch 5 is turned on, the power is turned on to the circuits 6 and 7 after the first rectifier circuit 4, and the electric device is brought into the operating state.

As described above, the electric device can be brought into the standby state and the operating state. In the operating state, when the detection circuit 22 detects an abnormality of the main circuit 7 by detecting an overcurrent, an abnormality detection signal is supplied to the SCR gate of the thyristor circuit 23, and the SCR turns on to hold the switching transistor Q11 in the on state. . As a result, the relay drive transistor 11 is turned off, the relay 5 is turned off, the power supply to the circuits 4, 6, and 7 is stopped, and the microcomputer 9 determines the low level state of the terminal 92, and By setting the main on / off terminal 94 for turning on / off 14-1 to a high level, the motor drive transistor 15 is turned on and the motor 14 is connected to the positive output terminal of the smoothing capacitor 102-2 of the second rectifier circuit 102. A drive current flows through -2 to the reference potential point through the collector-emitter path of the transistor 15, and turns off the switch 14-1 of the main power switch 14 with a motor.

In this way, for example, when an abnormality in the main circuit 7 is detected by overcurrent detection, the power supply to most parts of the electric equipment (excluding the AC cord, AC input part, fuse, filter, etc.) is turned off. Thus, the electrical device can be kept in a safe state. One or more detection circuits 22 for performing abnormality detection by overcurrent detection are also arranged in portions other than the main circuit 7, and detection signals from a plurality of detection circuits are respectively passed through diode switches or the like to the thyristor circuit 23.
The main power switch with motor 1 detects an abnormality in a circuit part other than the main circuit 7 and
4 can be turned off, and the safety of the electric device can be further increased.

FIG. 13 is a block diagram showing a power supply circuit according to the fifth embodiment of the present invention.

In the embodiment shown in FIG. 13, the thyristor circuit 23 shown in FIG. 11 is deleted, and a detection circuit 22A for detecting a circuit abnormality is provided. Although the detection circuit 22A in FIG. 13 is an overcurrent or overvoltage detection circuit, it has a circuit configuration that outputs the detection signal at a high or low voltage level. Then, when the voltage detected by the detection circuit 22A exceeds a predetermined value, the detection circuit 22A outputs an abnormality detection signal indicating an abnormality and directly supplies the signal to the input port 99 of the microcomputer 9. The microcomputer 9 is configured to output a high-level signal to the main on / off terminal 94 when the detection voltage input to the input port 99 is at a high level. (Alternatively, if the detection voltage input to the input port 99 is high, the microcomputer 9 outputs a low-level signal to the on / off terminal 92 and outputs a high-level signal to the main on / off terminal 94. Other configurations are the same as those in FIG. 11, and a description thereof will be omitted.

According to the configuration shown in FIG. 13, when the detection circuit 22A detects an abnormality due to overcurrent detection or overvoltage detection, the microcomputer 9 turns on the motor drive transistor 15 to turn on the motor-equipped main circuit. Drive current is supplied to the motor 14-2 of the power switch 14, and the motor 14-2
To turn off the main power switch 14-1.

Also in the case of the fifth embodiment, for example, when an abnormality of the main circuit 7 is detected, power is supplied to most parts of the electric equipment (excluding the AC cord, AC input part, fuse, filter, etc.). Can be turned off, so that the electrical device can be kept in a safe state. Also in the case of the present embodiment, one or more detection circuits 22A for performing abnormality detection are arranged in portions other than the main circuit 7, and detection signals from the plurality of detection circuits 22A are respectively passed through diode switches or the like. With the configuration leading to the input port 99, an abnormality can be detected (monitored) in a circuit portion other than the main circuit 7, the main power switch 14 with a motor is turned off, and the safety of the electric device can be further improved.

FIG. 14 is a block diagram showing a power supply circuit according to the sixth embodiment of the present invention.

In the embodiment shown in FIG. 14, the thyristor circuit 23 shown in FIG. 11 is omitted, and a detection circuit 22A for detecting a circuit abnormality is provided. The detection circuit 22 of FIG.
A is an overcurrent or overvoltage detection circuit, but has a circuit configuration that outputs the detection signal at a high or low voltage level. When the voltage detected by the detection circuit 22A exceeds a predetermined value, the detection circuit 22A outputs an abnormality detection signal indicating abnormality and supplies the signal to the base of the motor drive transistor 15 without passing through the microcomputer 9. I do. Other configurations are the same as those in FIG.

According to the configuration of FIG. 14, when an abnormality due to overcurrent detection or overvoltage detection is detected by the detection circuit 22A, the detection circuit 22A turns on the motor drive transistor 15 to turn on the motor. Drive current is supplied to the motor 14-2 of the main power switch 14
The main power switch 14-1 can be turned off by rotating 14-2.

Also in the case of the sixth embodiment, for example, when an abnormality of the main circuit 7 is detected, power is supplied to most parts of the electric equipment (excluding the AC cord, AC input part, fuse, filter, etc.). Can be turned off, so that the electrical device can be kept in a safe state. Also in the case of the present embodiment, one or more detection circuits 22A for performing abnormality detection are arranged in portions other than the main circuit 7, and detection signals from the plurality of detection circuits 22A are respectively passed through diode switches or the like. If the configuration is such that the circuit is led to the base of the motor drive transistor 15, the main circuit 7
An abnormality can be detected (monitored) in other circuit parts and the main power switch 14 with the motor is turned off to further enhance the safety of the electric equipment.

Next, when the user erroneously inputs an AC voltage exceeding the rated voltage of the device (for example, when erroneously inserted into a 200 V system power outlet with respect to the 100 V rating), the electric device due to the erroneous use is disconnected. A power supply circuit capable of preventing destruction will be described.

FIG. 15 is a block diagram showing a power supply circuit according to the seventh embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 15 differs from FIG. 1 in that FIG.
The configuration for supplying a drive current from the main on / off terminal 94 of the microcomputer 9 to the motor 14-2 of the main power switch 14 with a motor via the motor drive transistor 15 in FIG. In place of the signal detection circuit 16 for detecting the power supply, an overvoltage detection circuit 24 for detecting that the power supply voltage of the input AC power supply has become equal to or higher than a predetermined power supply voltage is provided downstream of the switch 14-1 of the main power switch 14 with a motor. And a current supply circuit 25 for supplying a drive current to the motor 14-2 of the main power switch 14 with a motor based on the abnormality detection signal when the overvoltage detection circuit 24 detects an abnormality. . In this embodiment, the main power switch 14 with a motor as described with reference to FIGS. 2 to 5 is employed to turn off the main power switch 14-1 when an overvoltage abnormality is detected. Other configurations are the same as those in FIG.

In the configuration of FIG. 15 described above, the input AC power supply is the switch 14 of the main power switch 14 with the motor.
-1 to the main power supply side circuits (4, 6, 7) and the standby power supply circuit 10,
If the manual operation unit 14-3 is not pressed, the AC power supply voltage is not supplied to the main power supply side circuits (4, 6, 7) and the standby power supply circuit 10. Therefore, even if an excessive voltage exceeding the rated voltage of the device is applied to the AC plug 1, the main power supply side circuits (4, 6, 7) and the standby power supply circuit 10 are not broken. When the switch 14-1 of the motor-equipped main power switch 14 is pressed while an excessive voltage exceeding the rated voltage of the device is applied to the AC plug 1, the standby power circuit 10 and the main power circuit ( 4, 6, 7), the overvoltage detection circuit 24 operates when the voltage exceeds a predetermined AC voltage, and an abnormality detection signal corresponding to the AC voltage is supplied to the current supply circuit 25. On the basis of the abnormality detection signal, the current supply circuit 25 supplies a drive current to the motor 14-2 of the motor-equipped main power switch 14 to rotate the motor 14-2. To open (off). With this series of operations, even when an excessive AC voltage exceeding the rated voltage is input to the electric device due to a user's misuse, it is possible to prevent the device main body from being destroyed.

FIG. 16 is a block diagram of a power supply circuit according to the eighth embodiment of the present invention. The embodiment of FIG.
Although it can be said that this is also a circuit example that further embodies the fifth embodiment, the difference from FIG. 15 is that the overvoltage detection circuit 24 in FIG. 15 is configured to directly detect the voltage of the input AC power supply. On the other hand, in FIG.
Indicates that the output voltage at the output terminal of the second rectifier circuit 102 in the standby power supply circuit has exceeded a predetermined value (ie, overvoltage).
And the microcomputer 9 is provided with a main ON / OFF terminal 94. When the overvoltage detection circuit 24 detects an overvoltage, or when the remote control transmitter 1
When the main power key provided for the microcomputer 3 is operated,
Is that the main power switch 14 can be turned on and off by a user's remote control operation by receiving the key operation signal and setting the potential of the main on / off terminal 94 to a high level. Other circuit block configurations are the same as those in FIG.

The overvoltage detection circuit 24 shown in FIG.
The standby transformer 101 2, which comprises a series circuit of a Zener diode ZD and a resistor R 32, forms a standby power supply circuit.
From the output terminal of the smoothing capacitor 102-2 for rectifying and smoothing the voltage of the secondary output terminal, through the Zener diode ZD and the resistor R32 for limiting the current of the Zener diode ZD, the input terminal of the current supply circuit 25, that is, NPN. Transistor Q31
It is configured to connect to the base.

The current supply circuit 25 is a circuit for supplying a current to the motor 14-2 of the main power switch with motor 14. The current supply circuit 25 includes a diode D31, a capacitor C33, and a transistor Q31. The motor 14-2 has a first end connected to the secondary side reference potential point via a capacitor C33 via a diode D31 for preventing backflow from the plus output end of the smoothing capacitor 102-2.
Connected to the connection point of the diode D31 and the capacitor C33,
The other end of the motor 14-2 is connected to the collector of the transistor Q31. The emitter of the transistor Q31 is connected to the reference potential point.

Next, the operation of the embodiment shown in FIG. 16 will be described. If the user erroneously connects the AC plug 1 to an AC voltage outlet exceeding the rated voltage of the electric equipment and further turns on the switch 14-1 of the main power switch 14 with the motor, the primary side input of the standby transformer 101 Edge AC
The voltage increases, and the reduced AC voltage on the secondary side also increases. Accordingly, the DC voltage Eb obtained by rectifying and smoothing this AC voltage in the second rectifier circuit 102 also rises with the input AC voltage, and when it exceeds a predetermined voltage, the overvoltage detection circuit 24
Zener diode ZD conducts. When the Zener diode ZD conducts, a base current flows to the input terminal (base of Q31) of the current supply circuit 25, and the transistor Q31 conducts. As a result, when the DC voltage Eb rises, the current due to the electric charge previously stored in the capacitor C33 via the diode D31 and the current flowing through the diode D31 using the DC voltage Eb as a power supply are supplied to the motor 14- of the main power switch 14 with motor. 2 and further to the reference potential point through the collector-emitter path of transistor Q31. When a current flows through the motor 14-2 of the main power switch with motor 14, the motor 14-2 rotates, and the mechanical switch 14-1 of the main power switch 14 with motor is opened (off). By this series of operations, application of an excessive AC voltage to the main power supply side circuit (4, 6, 7) and the standby power supply circuit (101 to 103) due to erroneous insertion by the user is avoided, and destruction of the device is prevented. It becomes possible.

According to the embodiment of the present invention described above,
A main power switch that turns on and off the AC power supply, and a motor that gives a torque to turn it off is added. By detecting a circuit abnormality in the electric equipment or an abnormality in the input power supply, the current is supplied to the motor. The main power switch can be automatically turned off, the circuit operation of almost all parts of the electric equipment can be stopped, and the electric equipment can be kept in a safe state. Power consumption can be eliminated.

In the above embodiment, the power supply circuit in the TV receiver has been described.
The present invention is not limited to the power supply circuit of the receiver, and can be applied to the power supply circuits of various electric devices including a main power switch and a standby switch.

Further, in the above embodiment, the case where the operation keys of the remote control transmitter are mainly used as the operation means has been described. However, the operation means may be the operation keys arranged on the main body of the electric equipment. Of course.

[0158]

As described above, according to the present invention, the main power switch of the electric equipment can be automatically turned off when a specific operation state considered unnecessary by the user continues for a predetermined period. In addition, power consumption can be almost eliminated, power saving (economical efficiency) can be improved, and safety can be improved. Furthermore, the main power switch can be turned on and off by remote control operation. In particular, it is useful for home electric appliances.

According to the present invention, in an electric device having a main power supply circuit and a standby power supply circuit, the electric device can be stopped (all off) by remote control operation by using a motor-type interlock switch. And
Also, from the stop state of the electric device, it is possible to put the device into an operating state at once by turning on the main power switch,
In addition, the electrical equipment suffered an unexpected power outage, and the power outage was caused by a natural disaster such as an earthquake, and the environment became dangerous for the electrical equipment to operate, or the user was absent during the power outage and the electrical equipment operated. It is possible to avoid a wasteful environment and to ensure safety.

Further, according to the present invention, in an electric device having a main power supply circuit and a standby power supply circuit and capable of standby operation, when an abnormality in the electric device is detected, the main power switch is automatically turned off. Then, it is possible to stop the operation of most parts in the equipment and put the electric equipment in a safe state, or if the user accidentally connects the electric equipment to a power supply system exceeding the rated voltage, It is possible to prevent the destruction of the electric device due to use beforehand and to ensure safety.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a power supply circuit according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a main power switch with a motor in FIG. 1;

FIG. 3 is a diagram for more specifically explaining a configuration example of a main power switch with a motor in FIG. 2;

FIG. 4 is a view for explaining the configuration and operation of a cam switch in FIG. 3;

FIG. 5 is a diagram illustrating a configuration example including a transmission unit that pushes a main power switch by using a rotational motion of a motor.

FIG. 6 is a block diagram showing a power supply circuit according to a second embodiment of the present invention.

FIG. 7 is a diagram illustrating a configuration example of a motor-type interlocking switch in FIG. 6;

FIG. 8 is a timing chart of Vcc and Vsw for explaining the operation of FIG. 6;

FIG. 9 is a timing chart of Vcc and Vsw for explaining the operation of FIG. 6;

FIG. 10 is a block diagram showing a power supply circuit according to a third embodiment of the present invention.

FIG. 11 is a block diagram showing a power supply circuit according to a fourth embodiment of the present invention.

FIG. 12 is a circuit diagram illustrating an example of an overcurrent detection circuit in FIG. 11;

FIG. 13 is a block diagram showing a power supply circuit according to a fifth embodiment of the present invention.

FIG. 14 is a block diagram showing a power supply circuit according to a sixth embodiment of the present invention.

FIG. 15 is a block diagram showing a power supply circuit according to a seventh embodiment of the present invention.

FIG. 16 is a block diagram showing a power supply circuit according to an eighth embodiment of the present invention.

FIG. 17 is a block diagram of a power supply circuit in a conventional electric device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... AC plug 5 ... Relay (standby switch) 6 ... Main power supply circuit 7 ... Main circuit 9 ... Microcomputer (control means) 10 ... Standby power supply circuit 12 ... Light receiver 13 ... Remote control transmitter (operation means) 14 ... Motor Main power switch 14-1 Main power switch 14-2 Motor 14-3 Manual operation unit 16 Signal detection circuit 17 Backup power supply 18 Power failure detection circuit 19 Switch open / close detection circuit 20 Motor drive circuit 21 Motor type interlock switch 21-1 Main power switch 21-2 Motor 21-3 Manual operation unit 22, 22A Abnormality detection circuit 23 Thyristor circuit 24 Overvoltage detection circuit 25 Current supply circuit (current supply means) 71 ... TV signal input terminal 72 ... External input terminal 73 ... Mode selection switch (mode selection means) 74 ... Video processing circuit 91 ... Source terminal 94: Main off terminal or main on / off terminal 95: Signal detection terminal 96: Clock circuit (measurement of duration of no operation) 97: Power failure detection terminal 98: Main power switch open / close detection terminal 99: Abnormality detection Terminal 100: Main power switch off detection terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshifumi Ohira 1-9-2, Harara-cho, Fukaya-shi, Saitama Prefecture Inside the Toshiba Fukaya Video Factory (72) Inventor Tsuyoshi Kochi 3-9-1, Shimbashi, Minato-ku, Tokyo No. Toshiba Abu E Co., Ltd. (72) Inventor Masaaki Ishihara 3-3-9, Shimbashi, Minato-ku, Tokyo Toshiba Abu E Co., Ltd. F-term (reference) 5C026 EA07 EA08 5G057 AA01 AA06 AA19 BC04 BC06 BD07 KK18 KK19 KK26 KK32 RT06 YY01 YY13

Claims (19)

[Claims] 1. A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, and a standby switch provided at a stage subsequent to the main power switch for turning on / off power supply to a main power supply circuit. A standby power supply circuit that is provided at a stage subsequent to the main power switch and supplies necessary power to at least a control unit in the electric device during standby, and is provided at a stage subsequent to the main power switch and the standby switch. A main power supply circuit for supplying necessary power to a main circuit in the electric equipment based on a commercial power supply, and a detection for detecting that the electric equipment has continued a specific operation state for a predetermined period during the operation of the electric equipment. And control means operable based on power from the standby power supply circuit, wherein the standby switch is turned on and off based on a key operation of an operation means. Control means capable of controlling and driving the motor of the main power switch with the motor based on the detection result of the detection means or the key operation of the operation means to turn off the main power switch; and A power supply circuit comprising: 2. The apparatus according to claim 1, further comprising means provided in said control means for enabling / disabling an automatic OFF operation of a main power switch with a motor based on a detection result of said detection means. Item 2. The power supply circuit according to item 1. 3. The detection means comprises means for detecting the presence or absence of an operation signal from the operation means. The control means receives a signal indicating that there is no operation signal from the detection means for a predetermined period of time. The power supply circuit according to claim 1, wherein the power supply switch is turned off. 4. The detecting means comprises means for detecting the presence or absence of a specific signal in the main circuit. The control means, when a signal indicating the absence of a specific signal is inputted from the detecting means for a predetermined time, the main power supply The power supply circuit according to claim 1, wherein the switch is turned off. 5. When the electric device is a television receiver, the detecting means comprises means for detecting the presence or absence of a television signal in the main circuit. 3. The power supply circuit according to claim 1, wherein the main power switch is turned off when a signal indicating no television signal is input. 6. When the electric device is a television receiver and includes a mode selection unit for selecting any one of a television signal and an external signal, the detection unit includes the mode selection unit. Is configured to detect the presence or absence of an external signal in the main circuit when the device is in the external input mode, and the control unit receives a signal indicating that there is no external signal from the detection unit for a predetermined time. The power supply circuit according to claim 1, wherein the power supply switch is turned off. 7. A main power switch for turning on / off electric power supplied from a commercial power supply, a second switch for turning on / off in conjunction with the main power switch and detecting on / off of the main power switch; A motor-type interlocking switch including a main power switch and a motor for turning on and off the second switch; and a standby switch provided at a subsequent stage of the main power switch for turning on / off power supply to a main power circuit. A standby power supply circuit that is provided at a stage subsequent to the main power switch and is capable of supplying necessary power to control means in the electric device based on commercial power during standby, and operates based on power from the standby power supply circuit. At least when the main power switch is turned off in a standby state, the main power switch off is stored in the storage means, and then the main power switch is turned off. Control means for controlling the standby switch to be turned on based on the stored contents of the storage means when the power switch is turned on, and the second switch is provided from the standby power supply circuit. Of the power supply to the main power switch off detection terminal of the control means can be turned on and off, and at least when the main power switch is turned off at the time of standby operation, the second switch is turned off. A power supply circuit for supplying a signal indicating that the main power switch is turned off to the control means. 8. A main power switch for turning on / off electric power supplied from a commercial power supply, a second switch for turning on / off in conjunction with the main power switch and detecting on / off of the main power switch; A motor-type interlocking switch including a main power switch and a motor for turning on and off the second switch; and a standby switch provided at a subsequent stage of the main power switch for turning on / off power supply to a main power circuit. A standby power supply circuit provided at a stage subsequent to the main power switch and capable of supplying necessary power to control means in an electric device based on the commercial power supply during standby; and via the main power switch and the standby switch. Power is supplied from the commercial power supply, and a main power supply circuit for supplying power to a main circuit in the electric device; and A motor drive circuit for turning off the main power switch by passing a current to the motor of the motor type interlock switch, when the output voltage of the commercial power supply drops below a predetermined value,
A power failure detection circuit that outputs a first detection signal indicating a possibility of a power failure based on an output potential of the standby power supply circuit; and a power failure detection circuit that is provided to be connected to the second switch of the motor-type interlock switch. A switch open / close detection circuit that outputs a second detection signal indicating on / off of the main power switch according to on / off of the second switch, and control means that operates based on power from the standby power circuit, When the output voltage of the commercial power supply drops below a predetermined value in a standby state, a first detection signal indicating a possibility of a power failure from the power failure detection circuit and a main power switch on from the switch open / close detection circuit The power failure is determined based on the detection signal of No. 2 and stored in the storage means, and the next time the power supply of the commercial power supply is started, the power failure is determined based on the stored contents of the storage means. Power supply circuit supplies a drive signal to the motor drive circuit is characterized by comprising a control means for controlling so as to turn off the main power switch. 9. The power failure detection circuit operates based on a light emitting diode that emits light based on power supply from the commercial power supply and a power supply from the standby power supply circuit, and responds to a light amount from the light emitting diode. A phototransistor through which a current flows, and a resistor connected in series with the phototransistor for converting a current value of the phototransistor into a voltage and outputting the voltage as a power supply voltage detection signal of the commercial power supply; The detection circuit includes an output terminal of the standby power supply circuit connected to one end of the second switch of the motor-type interlock switch, and a collector connected between the output terminal of the standby power supply circuit and a reference potential point via a resistor. The emitter is connected, turns on and off according to the base voltage, and outputs the low level and high level output to the collector as the on / off state of the main power switch. , A switching transistor that outputs as the second detection signal indicating off, and a second transistor provided between the other end of the second switch of the motor-operated interlock switch and a reference potential point, and the second switch is turned on. 9. The power supply circuit according to claim 8, further comprising a resistor and a capacitor circuit for applying a base voltage to the switching transistor based on power supply from the standby power supply circuit. 10. The control means is capable of turning on and off the standby switch based on a key operation of an operation means, and supplies a drive signal to the motor drive circuit based on a key operation of an operation means. The power supply circuit according to any one of claims 7 to 9, wherein the main power switch and the second switch can be turned off. 11. A backup power supply for control means, wherein said control means is operable based on said backup power supply, and controls on / off of said standby switch based on a key operation of an operation means. Possible and
It is possible to turn off the main power switch and the second switch by giving a drive signal to the motor drive circuit based on a key operation of an operation means, and the main power switch and the second switch are turned off. 10. The apparatus according to claim 8, wherein in the state, a drive signal is given to the motor drive circuit based on a key operation of an operation means to turn on the main power switch and the second switch. Power supply circuit as described. 12. A main power switch for turning on / off a commercial power supply, a second switch for turning on / off in conjunction with the main power switch and detecting on / off of the main power switch. A manual operation section for turning on the main power switch and the second switch when pressed once, turning off the main power switch and the second switch when pressed once again, and a motor that rotates by supplying drive current. One end of the motor is connected to a DC power supply, and the other end is connected to a transistor. The transistor is turned on by the control means to supply a drive current to the motor, and the main power is supplied by utilizing the rotational force. The power supply circuit according to any one of claims 7 to 11, further comprising: means for mechanically turning on and off the switch. 13. A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power supply circuit for supplying power to a main circuit in an electric device, and A standby switch for turning on / off power supply to the main power supply circuit; and a standby switch provided at a stage subsequent to the main power switch for supplying power to at least a control unit in the electric device during a standby operation. A power supply circuit, a detection circuit for detecting an abnormality of a circuit in the electric device, and a drive current supplied to a motor of the main power switch with the motor based on an abnormality detection signal of the detection circuit to turn off the main power switch. And control means operating based on power from the standby power supply circuit, wherein the standby switch is operated based on a key operation of an operation means. Power supply circuit, characterized by comprising a control means capable of on-off control. 14. A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power circuit for supplying power to a main circuit in an electric device, and A standby switch for turning on / off power supply to the main power supply circuit; and a standby switch provided at a stage subsequent to the main power switch for supplying power to at least a control unit in the electric device during a standby operation. A power supply circuit, a detection circuit for detecting an abnormality of a circuit in the electric device, a holding unit for holding the standby switch off based on a detection signal of the detection circuit, and a power supply from the standby power supply circuit Control means for operating the standby switch on / off based on a key operation of an operation means, and And a control means for applying a drive current to the motor of the main power switch with the motor based on the operation of holding the standby switch off, thereby turning off the main power switch. . 15. A main power supply switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power supply circuit for supplying power to a main circuit in electric equipment, A standby switch for turning on / off power supply to the main power supply circuit; and a standby switch provided at a stage subsequent to the main power switch for supplying power to at least a control unit in the electric device during a standby operation. A power supply circuit, a detection circuit that detects an abnormality of a circuit in the electric device, and control means that operates based on a power supply from the standby power supply circuit, wherein the standby switch is operated based on a key operation of an operation means. On-off control is possible, and drive current is supplied to the motor of the main power switch with the motor based on the abnormality detection signal of the detection circuit. Power supply circuit, characterized by comprising a control means which can turn off the main power switch. 16. A main power switch with a motor for turning on / off electric power supplied from a commercial power supply, a main power circuit for supplying power to a main circuit in an electric device, and A standby switch for turning on / off power supply to the main power supply circuit; and a standby switch provided at a stage subsequent to the main power switch for supplying power to at least a control unit in the electric device during a standby operation. A power supply circuit, a detection circuit for detecting an abnormality of a power supply voltage of a commercial power supply or a standby power supply circuit, and a main power supply that supplies a drive current to a motor of the main power switch with the motor based on an abnormality detection signal of the detection circuit. Current supply means for turning off a switch; and control means operating based on power from the standby power supply circuit, wherein key operation of the operation means is performed. Power supply circuit, characterized by comprising a control means capable of on-off controlling said standby switch based. 17. A backup power supply for control means, wherein said control means is operable based on said backup power supply, and is operated in response to a key operation of said operation means when said main power switch is turned off. The motor of the motor-equipped main power switch can be driven to turn on the main power switch.
A power supply circuit according to any one of the above items 16. 18. A main power switch with a motor for turning on / off electric power input from a commercial power supply, and a standby switch provided after the main power switch for turning on / off power supply to a main power supply circuit. A standby power supply circuit that is provided at a stage subsequent to the main power switch and that supplies power necessary for at least the control unit in the electric device during a standby operation; and operates based on power from the standby power supply circuit. Control means for controlling on / off of the standby switch based on a key operation of an operation means, and driving a motor of a main power switch with a motor based on a key operation of the operation means. And a control means for turning off a main power switch. 19. A main power switch with a motor, comprising: a main power switch for turning on and off a power supply from a commercial power supply; a first press to turn on the main power switch; and a second press to turn off the main power switch. And a motor that rotates by the supply of a drive current. One end of the motor is connected to a DC power supply, and the other end is connected to a transistor. 14. A means for supplying a drive current to a motor and mechanically turning on and off the main power switch using the rotational force of the drive current.
19. The power supply circuit according to any one of claims 18 to 18.