JPH0210777Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention supplies power to the load and switches it to an operating state [hereinafter referred to as ON] and a standby state [hereinafter referred to as STANDBY]. Regarding power supplies.

[Prior Art] A conventional power supply device of this type is shown in FIG. FIG. 3 is a circuit diagram partially showing a conventional power supply device in blocks. In the figure, 1 is a power supply circuit consisting of an AC power supply 2, a power switch 3, a power transformer 4, and a rectifier circuit 5; 6 is a control input terminal 7;
A power supply control circuit with a power supply memory having a remote control input terminal (hereinafter referred to as a remote control input terminal) 8 and an output terminal 9; 10 is a switching transistor 1;
1, 12, resistor 13, 14, 15, capacitor 1
6, a control input circuit 17, a load state switching relay consisting of a relay drive transistor 18, a relay coil 19, and a relay contact 20; 21, a remote control transmitting circuit (hereinafter referred to as a remote control receiving circuit);
22 is a remote control transmission circuit (hereinafter referred to as remote control transmission circuit).

The power supply control circuit 6 has a control input terminal 7 thereof.
When a signal is applied to, that is, short-circuited to, the output terminal 9 becomes the first
state, that is, high potential [hereinafter referred to as high],
Switches to a second state, that is, a low potential state (hereinafter referred to as "Low"), which stores the state before power off even after power is turned off, and returns to the original state after power is turned on again. It is configured like this. Note that the state of the output terminal 9 can also be changed by a signal sent to the remote control input terminal 7.

Next, the operation of this power supply device will be explained. First, when the power switch 3 is turned on (hereinafter referred to as on) with the power switch 3 turned off (hereinafter referred to as OFF) and the output terminal 9 of the power supply control circuit 6 memorized as low, the rectifier circuit 5 starts up. A voltage is applied to control input circuit 10 to charge capacitor 16;
The first switching transistor 11 is conductive only during the charging period. The second switching transistor 12 then becomes conductive, shorting the control input terminal 7 of the power supply control circuit 6 and causing its output terminal 9 to go high. This causes the drive transistor 18 of the relay circuit 17 to conduct, closing the relay contact 20 and turning on the load. When the power switch 3 is turned off in this state, the power control circuit 6 memorizes the state and is deenergized, the transistor 18 is turned off, and the relay contact 2
0 and the load is off, but when the power switch 3 is turned on again, the power supply control circuit 6 is energized and its output terminal 9 becomes the output state before it was deenergized, that is, high. Therefore, the emitter of switching transistor 11 is high and does not conduct. But transistor 1
Since the output terminal 9 is at high level, the output terminal 8 becomes conductive, closing the contact 20 and turning on the load.

To switch the load to standby in this state, an off command signal is sent from the remote control transmitting circuit 22 to the remote control input terminal 8 via the remote control receiving circuit 21.
, the power supply control circuit 9 switches from high to low, the transistor 18 turns off, the relay contact 20 opens, and the load enters the standby state.
When the power is turned off and turned on again in this state, the switching transistor 11 becomes conductive as described above, and the output of the power supply control circuit 6 switches from low to high, turning on the load.

In this manner, when the power supply device is turned off and then turned on again, the power supply device is controlled so that all the loads are turned on regardless of whether the load was on or in standby before the power was cut off.

[Problems to be Solved by the Invention] Since the conventional power supply device is configured as described above, even when the power is restored after a power outage, it operates in the same way as when the power switch 3 is turned off and then turned on. Therefore, there was a problem in that when the load was in a standby state, there was a power outage and then when the load was restored, the load would be turned on.

This device was devised to solve this problem, and is a power supply device that maintains the standby state when the load recovers from a power outage while the load is in standby state, and switches the load to the on state when the power is turned on again by turning the power switch on and off. is intended to provide.

[Means for Solving the Problems] The power supply device according to the present invention is such that, in the above device, the control input circuit of the power supply control circuit is connected to the power switch, and the control input circuit is connected to the control input circuit of the power supply control circuit during the closing period except for the moment when the power switch is turned on. In order to prevent the first switching transistor of the input circuit from conducting, a switch is provided to open and close the energizing circuit of the first switching transistor.

[Function] In this invention, when the power switch is closed, the interlocking switch provided in the control input circuit suppresses the conduction of the first switching transistor, and when the power is restored after a power outage, the first and second switches The switching operation of the power supply control circuit from the standby state to the on state due to conduction of the switching transistor is suppressed. On the other hand, only instantaneously after the power switch is turned on, the interlocking switch sequentially turns on the first switching transistor and the second switching transistor, thereby switching the power supply control circuit from the standby state to the on state.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram partially showing an embodiment of this invention in blocks. In the figure, 23 is a power switch 3.
As shown in FIG. 2, this switch is configured to be closed only when the power switch 3 is switched from OFF to ON and from ON to OFF. The other parts are the same as those of the conventional example shown in the third figure, so the explanation will be omitted.

Next, its operation will be explained. Switch 23 is the second
As shown in the figure, it is closed when the power switch 3 is on, and the base of the switching transistor 11 is grounded. Therefore, in this state, even if the power is cut off due to a power outage and then turned on again due to recovery, the transistor 11 will not turn on and will remain low even if the output terminal 9 of the power supply control circuit 6 is low. Therefore, the standby state of the load cannot be switched on even if the power is turned off or restored. However, when the power switch 3 is turned off and then turned on, the switch 23 is opened only at the instant of switching on, so that the charging pulse voltage of the capacitor 16 is applied to the base of the transistor 11 as shown in the second diagram, and the power supply control circuit If output terminal 9 of 6 is low, it conducts, causing transistor 12 to conduct, momentarily shorting input terminal 7 and switching output terminal 9 from low to high. This activates the relay circuit 17 and switches the load from standby to on.

In the above embodiment, the switch 23 is configured to open only at the moment the power switch 3 is switched on, but it is also possible to close the switch 23 when the power switch 3 is closed except at the moment the power switch 3 is switched on. Any interlocking configuration may be used. Also, when the switch 23 is opened, the control input circuit 10
It is also possible to configure the circuit so that it does not operate, but in this case, of course, the opening/closing relationship with the power switch 3 will be reversed.

[Effect of the idea] This idea is structured as above, so
By simply changing the configuration by simply adding an interlocking contact to the power switch, even if the load is temporarily turned off due to a power outage while the load is in standby mode, the standby mode will always be maintained and the power switch can be opened. This has the effect of providing a power supply device that performs normal operation by switching the load to the on state when the power is turned on again.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of this invention, partially shown in blocks, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a circuit diagram partially showing a conventional power supply device in blocks. In the figure, 1 is a power supply circuit, 3 is a power switch, 6 is a power supply control circuit, 7 is its control input terminal, 8 is its remote control input terminal, 9 is its output terminal, 10 is a control input circuit, 17 2 is a load state switching relay circuit, and 23 is a switch that operates in conjunction with the power switch 3. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Power is turned on and off by turning on and off the power switch.
a power supply circuit to be opened; energized by the power supply circuit; and having a control input terminal, a remote control input terminal, and an output terminal; a power supply control circuit that switches the output terminal to one of the states of 2 and maintains the state of the output terminal in the state before depowering even after the power supply circuit is deenergized; a relay circuit that switches the load to a standby state in an operating state and a second state; and a first switch that conducts only for a predetermined time when the power supply voltage of the power supply circuit rises when the power supply control circuit output terminal is in the second state. a second switching transistor that is conductive only when the transistor is conductive and provides a signal to the power supply control circuit control input terminal for switching the output terminal of the circuit to a first state; In the power supply device, the control input is used to control a switch that opens and closes the energizing circuit of the first switching transistor in conjunction with the power switch so that the first switching transistor does not become conductive while the transistor is closed except at the moment the power switch is turned on. A power supply device characterized by being provided in a circuit.