JP2798060B2 - Power control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control circuit such as a computer device for controlling a power supply to be turned on by an external remote signal when the power supply is turned off.

[0001]

2. Description of the Related Art In a conventional computer apparatus, when a power supply is turned on by performing remote control with an external signal, a power supply for operating a remote control function is provided inside the power supply, and an external signal is supplied. In general, the control power supply is started and cut off.

[0002]

In the prior art, when the output is controlled by an external remote signal, it is necessary to have a control power supply that is always operating inside the power supply.

[0003] The reason is that when power is controlled by an external signal, a constantly output power is required. However, when the power is constantly output, power is wasted, the life is shortened, and the reliability and safety are reduced. Further, in the case of controlling a circuit having no control power supply or an existing power supply, a circuit change is required, so that it is impossible to divert the power supply.

An object of the present invention is to make it possible to control a power supply that is constantly outputting or a power supply that does not have a control power supply with a safe and simple circuit, and that the output is maintained even when the input power supply is momentarily interrupted. It is an object of the present invention to provide a power supply control circuit capable of performing the above.

[0005]

A power supply control circuit according to the present invention is connected between a power supply (2 in FIG. 1) and an AC power supply (11 in FIG. 1) of the main unit and operates to connect the power supply of the main unit with the power supply. A relay (4 in FIG. 1) for connecting to an AC power supply, a switch (6a in FIG. 1) for operating the relay, and an output from the power supply of the main unit, which operate by the output of the power supply of the main unit. Contacts for switching the AC power supply path between the path including the relay and the path not including the relay (7a and 7 in FIG. 1).
b), and means (8 in FIG. 1) for controlling the operation of the latching relay by the control output of the main device.

Further, the power supply control circuit according to the present invention is a relay (FIG. 1) that connects between the power supply of the main unit and the AC power supply and connects between the power supply of the main unit and the AC power supply by its operation.
4), a switch for operating this relay (6a in FIG. 1), and an output of the power supply of the main unit, which operates by connecting the AC power supply path between the AC power supply and the power supply of the main unit with the relay. A latching relay (7 in FIG. 1) having a contact for switching from the included path to the excluded path, a generating means (10 in FIG. 1) for generating a control output of the main unit, and a means for controlling the operation of the latching relay by the control output (Figure 1
8). In this case, the generating means (10 in FIG. 1)
Generates a control output after storing data in the main unit.

In the present invention, when the manual switch is made, power is supplied to the coil of the two-contact relay and the contact is closed. When the contacts are closed, power is supplied to the power supply of the main unit, and the power supply is started. After the power supply is once activated, power is supplied to the latching relay by the output of the power supply, the contacts of the latching relay are switched, and the power supply route to the power supply is changed. By using the output of the main power supply as the power supply of the latching relay in this way, the latching relay does not close as long as the output of the power supply is held even if the input power supply is momentarily interrupted.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, an AC power supply 11
The power supply 2 of the main unit of the computer, the power supply 3 of a peripheral device such as a printer and optional devices, and the main unit 9 including a part of the CPU 10 of the computer are connected.

The power supply control circuit 1 includes a manual double switch 6
a, 6b (the contact 6b is inside the main body device 9), the relay 4 having the coil 4c and its two contacts 4a, 4b, the switch element 8 such as a transistor controlled by the CPU 10 in the main body device, and the switch element And a latching relay 7 connected to the latching relay 7. The switch 6a is connected in parallel to the contact 4b of the relay 4, and the switch 6b is connected to the CPU 10
Connected to. Relay 4 is connected between AC power supply 11 and power supply 2. The contact 7a of the latching relay 7 and the contact 4a of the relay 4 are connected in series between the power supply 2 and the AC power supply 11. The coil 4c has a contact 4b and a switch 6a.
Are connected in series. The coil 7c is connected to the output of the power supply 2. When power is supplied to the coil 7c, the contact 7a
To the contact 7b. The switch 5 is a switch for starting connected to the AC input side of the power supply 2.

Next, the operation of the embodiment of the present invention will be described in detail. When the manual switches 6a and 6b are closed, power is supplied from the AC power supply 11 to the coil 4c of the relay 4, and the contacts 4a and 4b are closed. Once the contact 4b is made, the power to the coil 4c is supplied via the contact 4b. Therefore, even if the switch 6a breaks, the contact of the relay does not open immediately and the power continues to be supplied. Contact 4
When a is made, if the AC switch 5 is made, power is supplied to the power supply 2 of the main unit, and the power supply output rises. When the power supply 2 starts up, power is supplied to the main unit 9. When power is supplied to the CPU 10 and the operation starts, the switch element 8 such as a transistor or FET is turned on by an ON signal from the CPU 10 or the outside. When the switch element 8 is turned on, power is supplied to the coil 7c of the latching relay 7. When power is supplied to the coil 7c, the contact switches from 7a to 7b. When the contact is switched to 7b, the power supply route from the AC power supply 11 is changed, and the power supply to the relay 4 is stopped. The contact 7
When switching from a to 7b, the power to the power supply 2 is interrupted for a moment, but the power supply 2 has a power holding function for the momentary interruption and has no effect.

Even if the input is instantaneously reduced in the state where the contact is switched to the contact 7b, the power supply 2 is supplied through the contact 7b of the latching relay 7, so that the power supply unit 2
As long as the output does not stop, the contact 7b keeps making, so that when the power is restored, the output is normally maintained.

When the output is stopped, the state of the contact 6b of the contacts 6a and 6b of the two switches is detected by the CPU 10, and when it is detected that the contact 6b is broken,
After performing an avoidance process (storing data) in the data holding memory 30 by the CPU 10, an OFF signal is transmitted from the CPU 10 to the switch element 8, the power supply to the coil 7c is stopped, and the contact of the relay 7 is set to 7b. To 7a to stop the power supply to the power supply 2 or to turn off the switch element 8 directly by an external signal.

As described above, since the power supply 2 of the main unit 9 is started by the manual switch 6a, a power supply for remote control is not required. Since the contact is switched to the contact 7b of the relay 7, the relay 4 is disconnected during normal power supply. Therefore, there is almost no influence by the relay 4. In addition, since the latching relay 7 is operated by the output of the power supply 2 which operates temporarily when the relay 4 operates, and then the power is fully supplied to the power supplies 2 and 3, only the input of one manual switch 6a is required. , A plurality of power supplies can be input.

When the power supply is stopped, the contact of the latching relay 7 is switched by the output of the CPU 10 again by the operation of the manual switch 6b, and the AC power supply 11
Is connected to the relay 4. At this time, since the relay 4 is not operating, the contact 4a remains open and the power supply O
It becomes FF. Moreover, since the CPU 10 switches the latching relay 7 via the switch element 8 after saving the data in the memory 30, the data is saved before the power is turned off.

In the present invention, the power supply control circuit 1 may include the CPU 10 of the main unit.

[0017]

The first effect is that the existing power supply unit without the remote control function can be easily controlled from the main unit by simply attaching a simple circuit externally. The point is that it can be diverted to the device. The reason is that the circuit is constituted only by the relay and does not require an external power supply at the time of starting.

A second effect is that a plurality of power supplies can be turned on / off in conjunction with one main apparatus power supply.
The reason is that the power supply route is controlled by switching the latching relay by the output of the main body power supply.

The third effect is that, when the AC input power supply is momentarily dropped, the input can be performed without closing the relay 4 and cutting the power supply route to the power supply as long as the power supply holds the output. The point is that the power supply continues to operate normally once it recovers. The reason is that the power supply of the relay is held by the output of the power supply of the main unit instead of the AC input.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply control circuit 2 Power supply of main unit 3 Power supply of optional unit 4 Relay 5 AC switch 6 Switch 7 Latching relay 8 Switch element 9 Main unit 10 CPU of main unit 11 AC power supply

Claims (4)

(57) [Claims] 1. A power supply control circuit for controlling ON / OFF of a power supply of a main unit, wherein the power supply of the main unit is connected to an AC power supply, and the operation connects the power supply of the main unit and the AC power supply. A relay, a switch for operating the relay, and an output of a power supply of the main device, which operate by an output of a power supply of the main device, and do not include an AC power supply path between the AC power supply and the power supply of the main device from a path including the relay. A power supply control circuit including: a latching relay having a contact for switching to a path; and means for controlling an operation of the latching relay by a control output of the main device. 2. The power supply control circuit according to claim 1, wherein said control means is a transistor element. 3. A power supply control circuit for controlling ON / OFF of a power supply of a main unit, wherein the power supply of the main unit is connected to an AC power supply, and the operation connects the power supply of the main unit and the AC power supply. A relay, a switch for operating the relay, and an output of a power supply of the main device, which operate by an output of a power supply of the main device, and do not include an AC power supply path between the AC power supply and the power supply of the main device from a path including the relay. A latching relay having a contact for switching to a path, generating means for generating a control output of the main body device, and means for controlling the operation of the latching relay by the control output, wherein the generating means includes: A power supply control circuit for generating the control output after storing data. 4. The power supply of an apparatus other than the main unit is connected to the AC power supply path not including the relay.
Or the power supply control circuit of 3.