JP2000132243A - Power circuit for electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately start an electric apparatus from in an all off state to an operation state and also to reduce sound when the electric apparatus is turned all off based on a remote control operation. SOLUTION: In this power circuit, when a tact switch S1 is depressed in no-operation state (all off) of an electric apparatus, a transistor Q1 and a diode D9 are turned on, 1st and 2nd latch relay S2 and S3 are simultaneously turned on and the apparatus can be immediately switched to an operation state. When the switch S1 is pressed down or the all off key of a remote control transmitter 7A is operated in the operation state of the apparatus (both S2 and S3 are on), an all off signal is outputted from a microcomputer 5A, the transistor Q1 is turned on, a transistor Q2 is turned on, the relays S2 and S3 are simultaneously turned off and the apparatus can be immediately turned all off. When the power on key of a remote control transmitter 5A is operated in remote control standby state with S2 on and S3 off, an on signal is outputted from the microcomputer 5A, S3 is turned on and the apparatus can be turned to an operation state. When the power source off key of the transmitter 5A is further operated in an operation state with both S2 and S3 on, an off signal is outputted from the microcomputer 5A, S3 is turned off and the apparatus can be turned to a standby state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for use in electric equipment, and more particularly to a power supply circuit for electric equipment which has a function of providing an all-off function by operating a remote control transmitter (remote control operation).

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a power supply circuit of a conventional electric device.

In FIG. 4, a commercial AC power supply (AC) is supplied to a primary winding 2-1 of a transformer for standby power supply 2, and the output of the secondary winding 2-2 is connected to bridge rectifier diodes D1 to D4.
And a smoothing capacitor C1, and a rectified output thereof is supplied to a standby power supply circuit 4 composed of a constant voltage circuit such as a switching type power supply circuit. Then, the output Vcc of the standby power supply circuit 4 is supplied to a power supply input terminal 51 of the microcomputer 5 which is a control means. Microcomputer 5
Is connected to a remote control light receiver 6. The output Vcc from the standby power supply circuit 4 is also supplied to the power supply input terminal 61 of the remote control light receiver 6. The first rectifier circuit 3 outputs a rectified voltage obtained by rectifying and smoothing an alternating current obtained from a commercial AC power supply, and the standby power supply circuit 4 stabilizes the rectified voltage and converts the rectified voltage into a microcomputer power supply voltage (for example, 5 V) and outputs it. ing.

A remote control signal such as an infrared code is input from a remote control transmitter 7 to a remote control light receiver 6. The remote control transmitter 7 has keys (including a power key) for instructing various operations of the device, and a power on / off signal is transmitted as a remote control signal by operating the power key.

One line of the commercial AC power supply 1 is connected via a switch 8-1 of an electromagnetic relay 8 as a standby switch to one of a second rectifier circuit 9 comprising bridge rectifier diodes D5 to D8 and a smoothing capacitor C2. , And the other line of the commercial AC power supply 1 is connected to the other input terminal of the second rectifier circuit 9. The rectified voltage rectified and smoothed by the second rectifier circuit 9 is supplied to a constant voltage circuit 10 as a main power supply circuit composed of a switching power supply circuit and the like. The DC voltage stabilized by the constant voltage circuit 10 as a main power supply circuit is supplied to a main circuit (not shown) as a load circuit of the device.

The electromagnetic relay 8 comprises a switch 8-1 and a drive winding 8-a for supplying a drive current for turning on the switch.
It consists of two. The relay 8 can supply a drive current to the drive winding 8-2 by supplying an ON signal from the microcomputer 5 to the base of the relay drive transistor Q1, and cut off the drive current by an OFF signal.

An output terminal of the first rectifier circuit 3 is connected to a main switch 11-1 of a power switch 11, which will be described later, a resistor R1,
The drive winding 8-2 of the relay 8 and the collector / emitter of the relay drive transistor Q1 are connected in series to a reference potential point. A relay drive signal (high level or low level) is supplied to the base of the transistor Q1 from an on / off terminal (ON / OFF) 53 of the microcomputer 5.

The power switch 11 is a two-contact interlocking lock switch including a main switch 11-1 and a second switch 11-2 interlocked with the main switch 11-1. The main switch 11-1 has a function of turning on and off a DC voltage (output voltage of the smoothing capacitor C1) from the first rectifier circuit 3 supplied to the winding 8-2 of the relay 8. The output terminal of the standby power supply circuit 4 is connected to the second switch 11-2 of the power switch 11 and the resistor R2.
Are connected in series to an operation instruction terminal 52 of the microcomputer 5. The second switch 11-2 applies the output Vcc (5V) of the standby power supply circuit 4 to the operation instruction terminal 52 of the microcomputer 5 as an ON signal when the power switch 11 is pressed,
As a result, the microcomputer 5 is turned on / off terminal (ON / OFF) 5
3 turns on the relay drive transistor Q1 by forcibly setting it to the high level, and turns the winding 8-2 of the relay 8 on.
It drives the drive current to turn on the switch 8-1.

In the above configuration, the commercial AC power supply (A
If C) is supplied, the first rectifier circuit 3 and the standby power supply circuit 4 are in operation, and the microcomputer 5 is also in an operation state in which the power supply circuit is supplied from the standby power supply circuit 4. Unless the power switch 11 is turned on, the main circuit of the device is in a standby state in which power is not supplied. When the power switch 11 is turned on from the state in which the interlocked power switch 11 is turned off, that is, the standby state, the switch 11-2 in the power switch 11 is turned on, and the output voltage of the standby power circuit 4 is turned on. Vcc enters the operation instruction terminal 52 of the microcomputer 5 as an ON signal. As a result, the power-on is stored in the memory in the microcomputer 5 and a relay drive signal (ON signal) is output from the terminal 53 of the microcomputer 5 to turn on the transistor Q1 and simultaneously operate the switch 11
When -1 is turned on, a drive current flows from the output terminal of the first rectifier circuit 3 to the reference potential point through the switch 11-1 and the winding 8-2, and as a result, the switch 8-1 of the relay 8 is turned on. A commercial AC power supply is supplied to the second rectifier circuit 9 on the main power supply side, and a stabilized DC voltage is supplied from the constant voltage circuit 10 to a main circuit unit (not shown), so that the electric device is in an operating state. Conversely, if the power switch 11 is turned off from this operation state, the voltage Vcc is not supplied to the operation instruction terminal 52 of the microcomputer 5 and the ON signal to the transistor Q1 is lost, so that Q1 is turned off and the winding 8- Since the power supply to 2 is turned off, the relay switch 8-1 is turned off, and the electric device returns to the standby state. At this time, power off is stored in the memory in the microcomputer 5.

Next, a case where an operation is performed by the remote control transmitter 7 will be described. In the case of remote control operation, the microcomputer 5 receives and decodes this signal by transmitting an operation stop (off) signal from the remote control transmitter 7 while turning on the power switch 11 and keeping the electric device in the operating state. The memory in the microcomputer 5 is turned off, the microcomputer 5 outputs an off signal from the on / off terminal 53 to turn off the transistor Q1, and the drive current stops flowing through the winding 8-2 of the relay 8. As a result, the switch 8-1 of the relay 8
Is turned off, and the electric device enters a standby state. In other words, the standby state can be set by operating the remote controller while the power switch 11 is kept on. When it is desired to return from the standby state based on the remote control operation to the operation state by the remote control operation, an operation instruction (ON) is issued from the remote control transmitter 7.
When the signal is transmitted, the memory in the microcomputer 5 is turned on, the microcomputer 5 returns the on / off terminal 53 to the on state, the transistor Q1 is turned on, the relay 8 is turned on, and the electric device is in the operating state. . When it is desired to return to the operation state by manual operation from the standby state based on the remote control operation, the power switch 11 is manually turned off (off) and then turned on again (on). Even when the memory is off, the operation instruction terminal 52 of the microcomputer 5 receives an operation instruction (ON) signal of the voltage Vcc from the standby power supply circuit 4 at the same time when the power switch 11 is turned on. Then, the microcomputer 5 returns the terminal 53 to the ON state, and the electric device enters an operating state.

As described above, when the commercial AC power is supplied, even if the power switch 11 is turned off in the operating state or the standby state, turning on the power switch 11 once turns the electric equipment at once. It can be in an operating state.

However, in the configuration of FIG. 4, even if the power switch 11 including the two interlocked switches 11-1 and 11-2 is turned off, the standby power supply circuit 4 after the standby power transformer 2
In addition, there is a problem that power is always consumed because the microcomputer 5 is working.

As an improvement of the above, there is a circuit as disclosed in Japanese Patent Application No. 10-258697 filed earlier by the present applicant.

According to this, a solenoid (electromagnet) is provided as a main power switch, and the main power switch can be released (turned off) by passing a current through the solenoid. Release main power switch (off)
Then, the microcomputer informs the microcomputer that the main power switch has been turned off, and the microcomputer stores this switch off in a memory (non-volatile) in the microcomputer, and then stores the switch off in the memory when the main power switch is turned on (on). Based on the contents, the electric device can enter the operating state by one operation. In addition, if a power failure occurs in the standby state (main power switch is turned on) and the power is restored after that,
It is kept in a standby state, so that safety in the absence can be ensured. When the main power switch is turned off, the power consumption can be reduced to zero because the AC switch turns off the AC power supply line. Further, in this system, the electric device can be all-off by a remote control transmitter using a solenoid of a main power switch. In this case, when the all-off code is transmitted to the electric device by the remote control transmitter, the all-off terminal of the microcomputer in the device becomes high level. As a result, current flows to the solenoid and the main power switch is released (off). Can be.

However, in the above-described circuit system, the power when the main power switch is turned off can be reduced to zero. However, since the lock switch is used as the main power switch, a current flows through the solenoid and the power is released (off). The cancellation sound is loud and there is room for further improvement.

[0016]

In the above-described circuit system,
The power consumption when the main power switch was turned off could be reduced to 0, but the release sound when the current was passed through the solenoid and released (turned off) for the lock switch used for the main power switch was loud, further improvement. There was room for

In view of the above-mentioned problems, the present invention is capable of starting an electric device from an all-off state to an operating state at a stretch, and reducing a sound when the electric device is all-off based on a remote control operation. It is an object of the present invention to provide a power supply circuit of an electric device which can perform the above.

[0018]

According to a first aspect of the present invention, there is provided a power supply circuit for an electric device, comprising: a first rectifier circuit for rectifying and smoothing an AC voltage input from a commercial AC power supply; A second rectifier circuit that rectifies and smoothes the AC voltage and supplies power to a main circuit in the electric device based on the rectified voltage; An operation switch for giving an instruction to all-off the device or for giving an instruction to bring the electric device from the all-off state to the operating state at once, and at least the electric device in the electric device based on the rectified voltage from the first rectifier circuit. A standby power supply circuit for supplying power required for the control means, and a power supply circuit provided between the output terminal of the first rectifier circuit and the standby power supply circuit, for turning on or off power supply to the standby power supply circuit; A first latch relay having a power switch function for holding the power supply and a second latch circuit between the commercial AC power supply and the second rectifier circuit, for holding power supply to the second rectifier circuit on or off. A second latch relay having a standby switch function, and a second latch relay provided between the operation switch and the control means, the second latch relay being based on a rectified voltage from the first rectifier circuit when the operation switch is pressed. A circuit for turning on the first latch relay, and the second switch based on a rectified voltage from the first rectifier circuit when the operation switch is pressed. A circuit for turning on the latch relay, and the first and second latches controlled by control means based on a remote control operation in a state where the first and second latch relays are held on. A circuit for canceling the relay and turning off the electrical device, and the first means controlled by the control means based on the operation of the operation switch while the first and second latch relays are kept on. A circuit for releasing the second latch relay and turning off the electric device, and a remote control operation when the electric device is in a remote control standby state in which the first latch relay is on and the second latch relay is off. Circuit for turning on the second latch relay under the control of the control means, and control means based on a remote control operation when the electric device is in an operating state where the first latch relay is on and the second latch relay is on. Control means for turning off the second latch relay by the control of the first and second latch relays, and control means operating based on the power supply from the standby power supply circuit. A state in which a control signal for turning off all electric devices is generated based on a remote control operation or an operation of the operation switch in a state where the first latch relay is kept on, and the first latch relay is kept on. And control means for generating a control signal for turning on or off the second latch relay based on a remote control operation to set the electric device in a standby state or an operation state.

According to a second aspect of the present invention, in the power supply circuit for an electric device according to the first aspect, the operation switch is a tact switch.

According to a third aspect of the present invention, in the power supply circuit for an electric device according to the first aspect, the first and second latch relays are two-winding type latch relays having a set winding and a reset winding. There is a feature.

According to a fourth aspect of the present invention, in the power supply circuit of an electric device according to the first aspect, the first and second latch relays are single-winding type latch relays using both a set winding and a reset winding. It is characterized by being.

In the present invention, when the operation switch is pressed in a state where the electric device is inactive (all off), the first and second operation switches are pressed.
The latch relays can be turned on at the same time, and the device can be brought into an operating state at a stretch. In the operating state of the device (both the first and second latch relays are on), the operation switch is pressed or the remote control transmitter is all off. When the key is operated, an all-off signal is output from the control means, and the first and second latch relays are simultaneously turned off, thereby turning off the equipment (ie, turning off the control means and the main circuit in the equipment). it can. Also, when the device is in a remote control standby state (that is, the first latch relay is on and the second latch relay is off),
When the power-on key of the remote control transmitter is operated, an ON signal is output from the control means, the second latch relay is turned on, and the device can be brought into the operating state. (Latch relays are both on)
Then, when the power-off key of the remote control transmitter is operated, an off signal is output from the control means, and the second latch relay is turned off, so that the device can be in the remote control standby state.

As described above, by using one operation switch and two latch relays, (1) the electric device can be all turned off by a manual operation switch or an operation by a remote control transmitter, and as a result, the device can be powered down. It can be set to zero consumption state. (2) When the electric device is inactive (all off), press the operation switch to put the electric device into operation at once. (3) Use the relay Therefore, the sound at the time of all-off is smaller than that at the time of using the lock switch (conventional example).

[0024]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a power supply circuit of an electric device according to one embodiment of the present invention. The same parts as those in FIG. 4 are described with the same reference numerals.

In FIG. 1, a commercial AC power supply (AC) is supplied to a primary winding 2-1 of a transformer 2 for a standby power supply, and the output of the secondary winding 2-2 is connected to bridge rectifier diodes D1 to D4.
And a smoothing capacitor C1 to a first rectifier circuit 3, and a rectified output to a light-emitting side of a photocoupler Q3 via a tact switch S1 as an operation switch. The power is supplied to the standby power supply circuit 4 composed of a constant voltage circuit such as a switching type power supply circuit via the relay switch W0 of the latch relay S2. That is, a DC voltage is supplied from the first rectifier circuit 3 to the standby power supply circuit 4 when the latch relay S2 is turned on. The output Vcc of the standby power supply circuit 4
Is supplied to the power input end of the microcomputer 5A as the control means and the power input end of the remote control light receiver 6 connected to the microcomputer 5A. The first rectifier circuit 3 outputs a DC voltage obtained by rectifying and smoothing an AC voltage from a commercial AC power supply. The standby power supply circuit 4 stabilizes the DC voltage and converts the DC voltage into a microcomputer power supply voltage (for example, 5 V) and outputs the same. are doing.

A remote control signal such as infrared rays is input to the remote control light receiver 6 from a remote control transmitter 7A.

One line of the commercial AC power supply 1 is connected to a second switch composed of bridge rectifier diodes D5 to D8 and a smoothing capacitor C2 via a relay switch W0 of a two-latch type second latch relay S3 which is a standby switch. The other line of the commercial AC power supply 1 is connected to the other input terminal of the second rectifier circuit 9. That is, the commercial AC power is supplied to the second rectifier circuit 9 by turning on the second latch relay S3. The rectified voltage rectified and smoothed by the second rectifier circuit 9 is supplied to a constant voltage circuit 10 as a main power supply circuit composed of a switching power supply circuit or the like. The DC voltage stabilized by the constant voltage circuit 10 as a main power supply circuit is supplied to a main circuit (load circuit) not shown.

The tact switch S1 is a push-type, lockless operation switch, which is turned on only while the finger is being pressed and turned off when the finger is released. That is, as seen from the keyboard switch, the switch is instantly turned on with one touch and then returned to the off state.

The latch relays S2 and S3 are of a two-winding type having a set winding W1 for turning on the relay switch W0 and a reset winding W2 for turning off the relay switch W0. , The latch is performed, and the on state is maintained even after the rated current is lost. Further, when a rated current for canceling is passed through the reset winding W2 for a predetermined time, the magnetized electromagnet is demagnetized and turned off. FIG. 2 shows the magnetization characteristics of the latch relay. A current is applied to the set winding W1 to add a magnetic flux (magnetic flux density B1).
Even so, the magnetic field Hc remains in the electromagnet portion (ferromagnetic portion), and the contact of the relay switch W0 is kept closed by the electromagnet. To release, a current flows through the reset winding W2 and a magnetic flux (magnetic flux density-
When B2) is added, the residual magnetic field Hc disappears and the contact of the relay switch W0 opens.

The output terminal of the tact switch S1 is connected to a reference potential point via a resistor R1, a set winding W1 of a latch relay S2, and a collector / emitter of a switching transistor Q1 in series. And resistor R3
Are connected in series to a reference potential point, and a resistor R2
, R3 is connected to the base of transistor Q1. The output terminal of the tact switch S1 is connected to a reference potential point via a diode D9, a resistor R11 and a set winding W1 of a latch relay S3 in series. Further, the output terminal of the tact switch S1 is connected to a reference potential point via the resistor R5 and the light emitting diode of the photocoupler Q3.

The output (Vcc) line of the standby power supply circuit 4 is connected to the operation switch-on detection terminal (DET) of the microcomputer 5A via the resistor R6 and the collector / emitter of the phototransistor of the photocoupler Q3 in series. , The reset winding W2 of the latch relay S2 and the transistor Q2
Are connected to the reference potential point via the collector and the emitter in series. Further, the output (Vcc) line is connected to a resistor R4.
, The resistor R8, the light emitting diode of the photocoupler Q4, and the collector / emitter of the transistor Q5 are connected in series to the reference potential point. Furthermore, the output (Vcc) line
It is connected to the base of transistor Q5 via resistor R9. Each base of transistors Q2 and Q5 is microcomputer 5
A is connected to the all-off terminal (ALL OFF) of A, and the collector of the photocoupler Q4 is connected to the base of the transistor Q1.

The output (Vcc) line of the standby power supply circuit 4 is connected to the collector of the transistor Q2 via the reset winding W2 of the second latch relay S3 and the diode D14 in series. The output (Vcc) line is
The resistor R12 and the collector / emitter of the transistor Q8 are connected in series to a reference potential point. The base of the transistor Q8 is connected to the off terminal (OFF) of the microcomputer 5A so that a signal for turning off S3 is supplied from the microcomputer 5A. The collector of Q8 is connected to the reset winding W2 of the latch relay S3. It is connected to the connection point of the diode D14. Further, the output (Vcc) line is connected to a resistor R
7, the light emitting diode of the photocoupler Q6, and the collector / emitter of the transistor Q7 are connected to the reference potential point, while being connected to the base of the transistor Q7 via the resistor R10. The base of the transistor Q7 is connected to the ON terminal (ON) of the microcomputer 5A so that a signal for turning on S3 is supplied from the microcomputer 5A. The collector of the phototransistor of the photocoupler Q6 is connected to the output terminal of the relay switch W0 of the first latch relay S2 (that is, the input terminal of the standby power supply circuit 4).
The emitter of the phototransistor 6 is connected to a reference potential point via a diode D10, a resistor R11 and a set winding W1 of a second touch relay S3 in series.

The microcomputer 5A as a control means includes a power supply terminal 51 to which the power supply Vcc is supplied from the standby power supply circuit 4, a detection terminal (DET) 54 for detecting that the tact switch S1 is turned on, On terminal (ON) for turning on and off the latch relay S3, which is a standby switch, to put the device into an operating state or a standby state
55 and an OFF terminal (OFF) 56 are provided. Further, an all-off signal for turning off the standby power supply and the main power supply of the electric device based on the operation of the all-off key provided on the remote control transmitter 17 and the operation of the tact switch S1. Is provided.

In addition to various keys (including a power-on key and a power-off key) necessary for operating the electric equipment, the remote control transmitter 7A serving as the remote control means includes first and second keys in the present embodiment. An all-off key for turning off the latch relays S2 and S3 by remote control is provided. When the relay S2 is turned on, the microcomputer 5A is supplied with power from the standby power supply circuit 4 to be in an operating state, and switches the relay S3 which is a standby switch based on the operation of the power on key and the power off key of the remote control transmitter 7A. On / off control can be performed, and the first and second latch relays S2, S3 are switched via the switch transistor Q2 based on the operation of the all-off key and the operation of the tact switch S1 provided on the remote control transmitter 7A. , A control current is applied to each reset winding W2 to release (turn off) the latch relays S2 and S3.

The ON terminal (ON) 55 of the microcomputer 5A
Is set so that a high level signal is output for a time longer than the time required until the latch relay S3 latches, and an all-off terminal (ALL OF).
F) 57, output from the OFF terminal (OFF) 56,
The latch relays S2 and S3 are set so that a high level signal is output for a time longer than the time required for releasing the latch. The output time of each high-level signal from these terminals 55 to 57 is longer than the time during which the tactile switch S1 is instantly turned on by a normal pressing operation (one touch).

In the above configuration, the resistors R1, R2, R
3 and the transistor Q1 are circuits for turning on the latch relay S2 when the tact switch S1 is pressed. When the tact switch S1 is pressed, the transistor Q1 is turned on.
Is turned on, a current flows through the set winding W1, and the latch relay S2 is held in the on state. Similarly, the diode D9 and the resistor R11 are circuits for turning on the latch relay S3 when the tact switch S1 is pressed. When the tact switch S1 is pressed, the set winding W of the latch relay S3 is turned on.
1 flows, and the latch relay S3 is held in the ON state. Therefore, if S1 is pressed in a state where both S2 and S3 are off, both S2 and S3 are turned on and the electric device is in an operating state.

The resistor R4, the transistor Q2, and the diode D14 are circuits for turning off the electric equipment by the remote control transmitter 7A when the latch relays S2, S3 are held in the ON state. When the off signal is transmitted to the microcomputer 5A, the microcomputer 5A
Becomes high level, the transistor Q2 is turned on, a current flows through the reset windings W2 of the latch relays S2 and S3 to release S2 and S3, and the electric equipment is inactive (all off). Becomes

The circuit composed of the resistors R5 and R6 and the photocoupler Q3 and the circuit composed of the resistors R8 and R9, the photocoupler Q4 and the transistor Q5 are composed of latch relays S2 and S3.
Are held on, the tact switch S1
Is a circuit for turning off all the electric devices when is pressed. The primary side (light emitting side) of the photocoupler Q3 is a resistor R
5 is connected to the output side of the tact switch S1, and the primary side of Q3 emits light instantaneously when S1 is turned on.
The secondary side (light receiving side) is turned on based on the light emitted when S1 is on, and outputs Vcc to the detection terminal (DET) of the microcomputer 5A.
Add to 54. The base of the transistor Q5 is connected to the all-off terminal (ALL OFF) of the microcomputer 5A in parallel with the base of the transistor Q2, and the output side (light receiving side) of the photocoupler Q4 is connected between the base and the emitter of the transistor Q1. When the switch S1 is pressed, the photocoupler Q3 is turned on, and the detection terminal (DE
T) 54 is set to high level. Upon receiving this signal, the microcomputer 5A sets the all-off terminal (ALL OFF) 57 to a high level, thereby turning on the transistor Q5. As a result, the photocoupler Q4 is turned on, and the base and emitter of the transistor Q1 are short-circuited. Therefore, the transistor Q1 is turned off, and no current flows through the set winding W1 of the latch relay S2, and at the same time, the transistor Q2 is turned on, so that a current flows through the reset winding W2 of the latch relay S2 and the latch relay S2 is released (turned off). ). Note that S2, S
3 If switch S1 is pressed in the ON state,
From the output terminal of the rectifier circuit 3 to the diode D9 and the resistor R11.
, The set current flows through the set winding W1 of the latch relay S3, while the transistor Q2 is turned on by the output from the all-off terminal (ALL OFF) 57. Therefore, the latch relay S3 is output from the output (Vcc) line of the standby power supply circuit 4. The reset current flows through the diode D14 and the transistor Q2 through the reset winding W2, but the tact switch S1 is turned on instantaneously, and the output period of the all-off signal of the microcomputer 5A is set to be long by the microcomputer 5A as described above. Therefore, the ON period of the transistor Q2 is longer than the ON period of S1. As a result, the ON state of the latch relay S3 is released (turned off) by the current flowing through the reset winding W2. That is, when the tact switch S1 is pressed while S2 and S3 are held in the ON state, the latch relays S2 and S3 are released (turned off) by the current flowing through each reset winding W2 of the latch relays S2 and S3, and the electric equipment is turned off. Can be all-off.

When the latch relays S2 and S3 are turned off and S1 is pressed next time, the relay S2 is open, the standby power supply circuit 4 is in an inactive state, and the power supply Vcc is not output. 5A is in a non-operating state, and a detection terminal (DET) of the microcomputer 5A through the photocoupler Q3.
Even if a signal indicating that S1 has been pressed is input to 54, the all-off terminal (ALL OFF) 57 does not go high, and the transistor Q1 and diode D9 turn on and S2
, S3, a current flows through each set winding W1, and each switch W0 of S2, S3 is turned on, so that the electric equipment is in an operating state.

The resistors R7 and R10, the transistor Q7 and the photocoupler Q6 are circuits for turning on S3 when the electric device is in the remote control standby state of S2 on and S3 off, and the base of the transistor Q7 turns on the microcomputer 5A. Terminal (ON) 55 is connected to the remote control transmitter 7
When an ON signal is received by remote control light reception based on the operation of the power ON key of A, the ON terminal (ON) 55 of the microcomputer 5A goes high, the transistor Q7 and the photocoupler Q6 are turned on, and the output terminal of the first rectifier circuit 3 is turned on. Then, a current flows through the set winding W1 of S3 through the switch W0 of S2, and the latch relay S3 is turned on. As a result, the electric device changes from the standby state to the operating state.

The resistor R12 and the transistor Q8 are a circuit for turning off S3 when the electric device is in the operating state of S2 on and S3 on. The base of the transistor Q8 is connected to the off terminal (OFF) 56 of the microcomputer 5A. When an off signal is received by remote control light reception based on the operation of the power off key of the remote control transmitter 7A, the off terminal (OFF) 56 of the microcomputer 5A goes high, Q8 turns on,
A current flows from the output (Vcc) line to the reset winding W2 of S3, and the latch relay S3 is turned off. As a result, the electric device changes from the operating state to the standby state.

As described above, in the circuit of the present embodiment, the electric equipment can be all turned off by the remote control transmitter 7A or the manual switch S1, and the relay S
2. Due to the use of S3, the sound at the time of all off with the remote control transmitter is smaller than the sound at the time of releasing the conventional lock switch. Further, by pressing the tact switch S1 from the all-off state (state of power consumption 0), the latch relays S2 and S3 can be turned on at the same time, and the electric equipment can be started at a stretch.

FIG. 3 is a circuit diagram showing a power supply circuit of an electric device according to another embodiment of the present invention. FIG. 3 is an example of a circuit in which single-winding first and second latch relays S2A and S3A are used in place of the two-winding first and second latch relays S2 and S3 in FIG. 1 will be described with the same reference numerals. Commercial AC power supply 1, standby power transformer 2, first rectifier circuit 3, standby power supply circuit 4, microcomputer 5A, remote control light receiver 6, remote control 7A, second rectifier circuit 9, constant voltage circuit 10, tact switch S1, Resistors R1 to R12, diodes D9, D10, D14, transistors Q1, Q2,
Q5 and Q7 and photocouplers Q3, Q4 and Q6 have the same functions as those in FIG.

The one-winding type latch relays S2A and S3A use both a set winding and a reset winding. When set, a rated current flows in a forward direction for a fixed time, and when reset, the same winding is released. For a certain time in the reverse direction. The operation of the power supply circuit according to the present embodiment is basically the same as that of the circuit of FIG. 1, but since the single-winding type latch relays S2A and S3A are used, the winding of the latch relay at the time of setting and at the time of resetting is performed. A circuit for flowing the set current and the reset current through the line in the opposite direction (ie, the diode D1
1, D12, resistors R21 and R22, photocoupler Q11, diode D13, transistor Q12, resistors R22 to R25, and photocoupler Q13).

The diodes D11 and D9 are for passing a current (setting current for turning on the relay switch) in the respective windings of the latch relays S2A and S3A in the forward direction, and the diodes D12 and D13 are respectively for the latch relays. S
This is for flowing a current (resetting current for turning off the relay switch) in a reverse direction to each of the windings 2A and S3A.

That is, a diode D11 is connected between the resistor R1 and the winding W11 of S2A, and a series circuit of a resistor R21 and a diode D12 is connected between the output terminal of the switch W10 of S2A and the collector of the transistor Q1. The resistor R25 and the light emitting diode of the photocoupler Q11 are connected in series between the output (Vcc) line and the collector of the transistor Q2. Further, resistors R22 and R23 are connected in series between the output terminal of the tact switch S1 and the reference potential point, the connection point of R22 and R23 is connected to the base of the transistor Q12, and one end of the winding W11 of S3A is connected to the transistor Q12. It is connected to a reference potential point via a collector and an emitter, and the output terminal of the second rectifier circuit 9 is connected to a resistor R24.
And a diode D13 to the front end of the winding W11. Further, a resistor R12 connected to the output (Vcc) line
And a photocoupler Q between the collector of the transistor Q8.
Thirteen light emitting diodes are connected, and the connection point between the winding W11 of S3A and the resistor R11 is connected to the reference potential point via the phototransistor of the photocoupler Q13.

Diodes D11 and D9 are used to supply a set current in the forward direction to the respective windings W11 of the latch relays S2A and S3A. Diodes D12 and D13 are respectively provided in the reverse direction to the respective windings W11 of the latch relays S2A and S3A. This is for allowing a reset current to flow.

The resistors R1, R2, R3, the diode D11 and the transistor Q1 are circuits for flowing a current for turning on the switch W10 of the latch relay S2A to the winding W11 of S2A when the tact switch S1 is pressed.

The resistors R11, R22, R23, the diode D9 and the transistor Q12 are circuits for flowing a current for turning on the switch W10 of the latch relay S3A to the winding W11 of S3A when the tact switch S1 is pressed.

The resistors R21 and R25, the diode D12, the photocoupler Q11, and the transistor Q2 release the on state of the latch relay S2A when an all-off signal is output from the all-off terminal (ALL OFF) 57 of the microcomputer 5A. ) Is a circuit for causing a current to flow through the winding W11 of S2A.

The resistors R24 and R12, the diode D13, the photocoupler Q13, and the transistor Q8 provide a current for releasing (turning off) the on state of the latch relay S3A when an off signal is output from the off terminal (OFF) 56 of the microcomputer 5A. To S3A
Is a circuit for flowing through the winding W11.

Similarly to FIG. 1, the resistor R4, the transistor Q2, and the diode D14 are circuits for turning off all the electric equipment by the remote control transmitter 7A when both S2A and S3A are in the on state. , R6 and a photocoupler Q3, and a resistor R8, R9 and a photocoupler Q3.
The circuit consisting of the transistor 4 and the transistor Q5 is a circuit for turning off all the electric devices by the tact switch S1 when both S2A and S3A are on. The resistors R7 and R10, the transistor Q7, and the photocoupler Q6 are connected between S2A ON and S2A.
Latch relay S3A when in remote control standby state with 3A off
Is turned on to bring the device into an operating state.

In the above configuration, the tact switch S1
Is pressed, the transistors Q1 and Q12 are turned on, and the rated current is supplied from the power supply (smoothing capacitor C1) to the latch relay S.
The diodes D11 and D9 flow through the windings of 2A and S3A in the forward direction, and the latch relays S2A and S3A are latched and turned on. When the latch relay S2A is released (turned off), the transistor Q1 is turned off because the transistors Q11, Q2, Q4, and Q5 are turned on based on the signal from the all-off terminal (ALL OFF) 57 of the microcomputer 5A. Capacitor C1)
Relay R through the resistor R21 and the diode D12
A reset current flows through the winding of 2A in the direction of the diode D12, and S2A is released (turned off). When releasing the latch relay S3A, the direction of D13 from the power supply (smoothing capacitor C2) through the resistor R24 and the diode D13 to turn on Q8 and Q13 based on the signal from the OFF terminal (OFF) 56 of the microcomputer 5A. Reset current flows and S3A is released (off)
Is done.

In the circuit of the embodiment of FIG. 3, similarly to the embodiment of FIG. 1, the electric equipment can be all turned off by the remote control transmitter 7A or the manual switch S1,
Moreover, since the relays S2A and S3A are used, the sound when the remote control transmitter 7A is all turned off is smaller than the sound when the conventional lock switch is released. Further, by pressing the tact switch S1 from the all-off state (state of power consumption 0), the latch relays S2A and S3A are simultaneously turned on, and the electric equipment can be started at a stretch.

[0055]

As described above, according to the present invention, all the electric devices can be turned off manually by the remote control transmitter, and the state of zero power consumption can be achieved. In addition, the relay is used. The sound when the remote control transmitter is turned off is smaller than the sound when the conventional lock switch is released. In addition, the electric device can be immediately activated from the all-off state (the state with no power consumption) to the operating state.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating magnetization characteristics of a latch relay used in a power supply circuit.

FIG. 3 is a circuit diagram showing a power supply circuit of an electric device according to another embodiment of the present invention.

FIG. 4 is a block diagram of a power supply circuit of a conventional electric device.

[Description of Signs] 1 ... Commercial AC power supply 3 ... First rectifier circuit 4 ... Standby power supply circuit 5A ... Microcomputer (control means) 6 ... Remote control light receiver 7A ... Remote control transmitter (remote operation means) 9 ... Second rectification Circuit S1: Tact switch (operation switch) S2: Two-winding latch relay (first latch relay) S3: Two-winding latch relay (second latch relay) S2A: Single-winding latch relay (first S3A: Single-winding type latch relay (second latch relay)

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[Procedure amendment]

[Submission date] October 28, 1998 (1998.10.
28)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

Claims (4)

[Claims] A first rectifying circuit for rectifying and smoothing an AC voltage input from a commercial AC power supply; a rectifying and smoothing AC voltage input from a commercial AC power supply; A second rectifier circuit for supplying power to the circuit, provided at a stage subsequent to the first rectifier circuit, which is turned on instantly with one touch to give an instruction to turn off the electric device or to turn the electric device from the all-off state at once. An operation switch for giving an instruction leading to an operation state; a standby power supply circuit for supplying necessary power to at least a control unit in the electric device based on a rectified voltage from the first rectifier circuit; A first latch relay that is provided between an output terminal of a rectifier circuit and the standby power supply circuit and has a power switch function for holding power supply to the standby power supply circuit on or off; Provided between a commercial AC power supply and the second rectifier circuit,
A second latch relay having a standby switch function for holding power supply to the second rectifier circuit on or off; and a second latch relay provided between the operation switch and the control means, wherein the operation switch is pressed. And a circuit for turning on the first latch relay based on a rectified voltage from the first rectifier circuit, provided between the operation switch and the control means, and when the operation switch is pressed. A circuit for turning on the second latch relay based on a rectified voltage from the first rectifier circuit; and a remote control operation in a state where the first and second latch relays are held on. A circuit for releasing the first and second latch relays under the control of the control means and turning off the electric device, and a state in which the first and second latch relays are kept on; A circuit for releasing the first and second latch relays and turning off the electric device by controlling the control means based on the operation of the operation switch in the state; A circuit for turning on the second latch relay under the control of the control means based on the remote control operation when the second latch relay is in a remote control standby state in which the second latch relay is off; A circuit for turning off the second latch relay under the control of the control means based on the operation of the remote controller when the latch relay is on, and a control means operating based on the power from the standby power supply circuit. In a state where the first and second latch relays are kept on, the electric device is turned on based on a remote control operation or an operation of the operation switch. It generates a control signal for turning off, in a state where the first latching relay is held in the ON, on the basis of the remote control operation second
And a control means for generating a control signal for turning on or off the latch relay of the above to bring the electric device into a standby state or an operating state. 2. The power supply circuit according to claim 1, wherein said operation switch is a tact switch. 3. The power supply circuit according to claim 1, wherein said first and second latch relays are two-winding type latch relays having a set winding and a reset winding. 4. The power supply circuit according to claim 1, wherein said first and second latch relays are single-winding type latch relays using a set winding and a reset winding together.