JPH0130854Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power on/off circuit, and is particularly applicable to a main power switch in electrical equipment that operates in response to a remote control device (hereinafter referred to as a remote control device). When turned from the off state to the on state, the sub power switch also turns on, and the device power is also turned on. If the AC power is temporarily cut off due to a power outage while the main power switch is on, the equipment that was just before the AC power was cut off will turn on. The present invention relates to a power on/off circuit that stores the state of the power supply (on/off state and standby state) and allows electrical equipment to return to the stored state after the AC power is restored.

[Technical background of the invention]

Electrical equipment that operates in response to a conventional remote control device, such as a television receiver that operates in response to a remote control device, includes a main power switch that turns on and off the AC power of the television receiver and puts it in a remote control standby state; A separate sub-power switch was provided to turn on the receiver power when the main power switch was on, that is, when the remote control was in standby mode.

[Problems with background technology]

For this reason, in conventional television receivers, when receiving broadcast signals, it is necessary to first turn on the main power switch and then turn on the remote control device or sub power switch, requiring a double operation procedure. .

[Purpose of invention]

The present invention has been developed in view of the above-mentioned points, and when operating the main power switch when the main power switch is in the OFF state in electrical equipment that operates in response to a remote control device, the electrical equipment will always turn off. The power is turned on, and the device is in a state where it can be turned on and off using the remote control, and if the AC power is temporarily cut off due to a power outage while the main power switch is turned on, the power status immediately before the AC power was turned off will be memorized. The object of the present invention is to provide a power on/off circuit that can restore an electrical device to its stored power state after the AC power is restored.

[Summary of the idea]

In electrical equipment that can be operated by remote control signals, the present invention provides a sub-power switch that turns on once the main power switch is turned on and then returns to the off-state immediately before the AC power is turned off. A storage means for storing the power state of the electrical equipment at the time of operation, and a control means for controlling the storage means according to the remote control signal and the signal from the sub power switch, so that when the main power switch is turned on, the equipment power is also turned on. When the main power switch is on, even if the AC power is temporarily cut off due to a power outage, etc., when the AC power is restored, the electric equipment is restored to the power state before it was turned off. It is something.

[Example of idea]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of the power on/off circuit according to the present invention, FIG. 2 is a circuit diagram showing an example of the storage control circuit of FIG. 1, and FIG. 3 is a circuit diagram of the circuit shown in FIG. 2. This is a timing chart explaining the operation.

As shown in Figure 1, a fuse 2 is inserted into one input line on the power outlet 1 side of the power supply line and connected to one winding of a line filter 3, and the other input line is connected to the line filter 3. Connect to the other winding of One output end of the line filter 3 is grounded and connected to one input end of the power transformer 4, and the other output end of the line filter 3 is connected to the other end of the power transformer 4 through the main power switch 5. Connect to the input end. Main power switch 5 is on.
This is a lock switch that is locked in the off state, and a sub power switch 6 is configured to operate in conjunction with this switch 5. The sub power switch 6 is a non-lock switch, and is automatically turned on when the main power switch 5 is locked in the on state, and then automatically returns to the off state.
The secondary output of the power transformer 4 is input to a control unit power rectifier circuit 7, and the voltage DC obtained by rectification by this circuit 7 is used as a DC power source for the storage unit control circuit 8. The storage unit control circuit 8 is connected to the storage unit 9 and controls the storage unit 9 by a remote control signal from the remote control device 10. Further, the storage section control circuit 8 is connected to the sub power switch 6 and controls the storage section 9 by turning the sub power switch 6 on and off. Furthermore, the storage unit control circuit 8 is connected to the drive circuit 11 via the storage unit 9, and is configured to turn on/off the drive circuit 11 and drive the switch circuit 12 according to the output signal of the storage unit 9. ing. One contact of the switch circuit 12 is connected to the power transformer 4.
The other contact is connected to the power rectifier circuit 13 of the main body of the electrical equipment, and the power rectifier circuit 1 is connected to the power rectifier circuit 13 according to the on/off of the switch circuit 12.
3 is also configured to turn on and off to supply DC power +B to electrical equipment. In addition, FIG. 1 shows a case in which the switch circuit 12 and its drive circuit 11 are constructed of a relay and a relay drive circuit, respectively.

The storage unit control circuit 8 shown in FIG. 1 is specifically configured as shown in FIG. In this circuit, the storage section 9 is constructed using a latch relay. As shown in FIG. 2, the control section power supply rectifier circuit 7
The power output terminal DC of is connected to the collector of transistor Tr ₁ , and the emitter of transistor Tr ₁ is connected to the resistor.
It is grounded via _R1 , and its emitter output is input to the relay drive circuit 11. Power output terminal
DC is connected to resistor R ₂ while connected to resistor R ₃ ,
A diode _D1 is connected between the resistors _R2 and _R3 , and a connection point between the resistor _R3 and the cathode side of the diode _D1 is connected to the base of the transistor _Tr1 via a resistor _R4 . Further, the power output terminal DC is connected to the resistor _R5 , and further connected to the contact A of the latch relay ₉ via the diode D2, and the contact B is connected to the resistor _R4.
It is connected to the base of transistor _Tr1 through. The common terminal U of the latch relay 9 is grounded. The latch relay 9 is provided with relay turns a and b for driving the contact piece of the common terminal U to the contact A side and the contact B side, respectively, and once it is driven to the contact A side or the contact B side, the relay turns number a, The driven contact state is maintained even if current no longer flows through the contact point b. The resistor R ₅ is connected in series with a resistor R ₆ and a diode D ₃ to one end of a relay winding a, and the other end of the winding a is grounded via a sub power switch 6. In addition, the resistor R ₂ is connected in series with a resistor R ₇ and a diode D ₄ and connected to one end of the relay winding b, the other end of the winding b is connected to the collector of the transistor Tr ₂ , the emitter is grounded, and the base resistance to
A remote control signal from the remote control device 10 is input through _R8 . Furthermore, a diode _D5 is arranged on the ground side of the relay windings a and b in the forward direction from winding a to b. Said resistance R ₆ , R ₇
are grounded via capacitors C ₁ and C ₂ , respectively, so that the alternating current component is dropped to the ground.

The operation of the circuit constructed in this manner will be described with reference to FIG. 3.

As shown in FIG. 2, when the contact of the latch relay 9 is on the B side, the main power switch 5 is operated,
When the state changes from the off state to the on state, the main power switch 5 operates in conjunction with the sub power switch 6, which also turns on the sub power switch 6 and sends a signal to the latch/relay control circuit 8 indicating that the main power switch 5 has been operated. send. This signal causes current to flow through the relay winding a of the latch relay 9, so the latch relay 9
The contact is switched to the A side and held in that state. In this case, since the sub power switch 6 is a non-lock switch, it automatically returns to the off state after being turned on, but the contact of the latch relay 9 remains held on the A side. When the contact is switched from the B side to the A side, the base potential of the output transistor Tr ₁ becomes "H" level, the transistor Tr ₁ is turned on, and a signal is sent to the relay drive circuit 11 to operate the relay 12. Therefore, power rectifier circuit 1
3 is supplied with an alternating voltage that has passed through the line filter 3, and the electrical equipment is set to the on state.

Next, a case will be described in which a remote control signal is input from the remote control device 10 in this state.
Since the contact of the latch relay 9 is on the A side (the electrical device is in the on state), current flows through the diode D ₂ and the contact A of the latch relay 9. When a remote control signal comes in, transistor Tr ₂ is turned on and windings a and b of latch relay 9 are grounded, but the current flowing through resistor R ₅ flows through contact A and into winding a. Resistance
Current flows through winding b through R ₂ , R ₇ and diode D ₄ . Therefore, the contact point of the latch relay 9 is
It is switched from the side to the B side and held. Therefore, the base of transistor Tr ₁ is grounded, its emitter output becomes "L" level, and relay 1
2 is turned off, and the electrical equipment is turned off. Even when the electrical equipment is turned off, the main power switch 5 remains on and in a remote control standby state until the next remote control signal is input.

Next, a case will be described in which the AC power is turned off due to a power outage or the like while in the above-mentioned remote control state, and then the AC power is restored. Even if the AC power is cut off, the latch relay 9 does not operate and the contact remains held on the B side. This is Latch Relay 9
This is because the contact position immediately before the power is turned off is maintained by the action of the permanent magnet. (Latch relay 9 serves as a last power supply memory). Therefore, when the AC power is restored thereafter, the electrical equipment returns to the remote control standby state.

In this remote control standby state, the contact of the latch relay 9 is on the B side, so the diode
Current flows through D ₁ and contact B of latch relay 9. At this time, when the next remote control signal comes in, transistor Tr ₂ turns on, but the current flowing through resistor R ₂ flows through contact B and does not flow into winding b.
Winding a through resistors R ₅ , R ₆ and diodes D ₃ , D ₅
A current flows through. Therefore, the contact of the latch relay 9 is switched from the B side to the A side and held, and as before, the transistor Tr ₁ is turned on, the relay drive circuit 11 is driven, and the electrical equipment is set to the on state. Ru.

Further, when the main power switch 5 is turned off and then turned on again, the sub power switch 6 operates as described above, the contact of the latch relay 9 is held on the A side, and the relay drive circuit 11 is driven to drive the electrical equipment. is in the on state. In this state, if the AC power is cut off due to a power outage, etc., the latch relay 9 will remain on the A side, and when the AC power is restored again, the latch relay 9 will be on the A side and will not be able to drive the relay. The circuit 11 is activated and the electrical device can return to the on state.

In addition, in Fig. 2, the storage section (last power supply memory)
Although a circuit configuration using a latch relay has been described, the present invention can also be implemented using other storage means, such as a semiconductor non-luminescent memory.

[Effect of idea]

As described above, according to the present invention, in an electrical device that operates in response to a remote control device, when the main power switch is operated from the OFF state to the ON state, the device power is also turned on, and this power state can be controlled by the remote control. To realize a power on/off circuit having the feature that even if the AC power supply is cut off due to a power outage or the like, and when the AC power supply is restored, the equipment power can be returned to the state immediately before the cutoff. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a power on/off circuit according to the present invention, Fig. 2 is a circuit diagram showing an example of the storage control circuit of Fig. 1, and Fig. 3 shows the circuit operation of Fig. 2. This is a timing chart to explain. 1...Power outlet, 3...Line filter, 4...Power transformer, 5...Main power switch, 6...Sub power switch, 7...Control unit power rectifier circuit, 8...Storage unit control circuit, 9...Storage means, 10...Remote control device, 11...Drive circuit,
12...Switch means, 13...Power rectifier circuit.

Claims (1)

[Scope of claim for utility model registration] Electrical equipment that can be remotely controlled using a remote control signal includes: an AC power source, a main power switch that is connected to the AC power source and can turn the power on and off; a sub power switch that turns on in conjunction with the on operation of the power switch and then automatically returns to the off state; and a sub power switch that rectifies the AC voltage supplied from the AC power source via the main power switch to produce a first DC voltage. a first power rectifier circuit for supplying the AC voltage supplied via the main power switch to a second power rectifier circuit via a switch means, the second power rectifier circuit means for rectifying the voltage to obtain a second DC voltage and supplying it to the electrical equipment; a drive circuit that drives the switch means to turn on and off the supply of the DC voltage to the electrical equipment; and the first a control circuit that is supplied with a DC voltage as an operating voltage and that generates a signal that controls the drive state of the drive circuit in response to reception of the remote control signal and operation of the sub power switch; and latch means for supplying the same control signal from the control circuit to the drive circuit as before the alternating current voltage was turned off when the AC voltage is turned on again. Power on/off circuit.