JPH0898403A - Power on/off interlocking system - Google Patents

Abstract

PURPOSE: To obtain a power ON/OFF interlocking system in which the power ON/OFF of a master unit can be interlocked with the power ON/OFF of a slave unit without requiring any service receptacle in the master unit. CONSTITUTION: The power ON/OFF interlocking system comprises a first connection circuit 46 connecting between a power supply input section 43 to be connected with a power supply and a main output section 45 to be connected with the power cord of a master unit 1, and a second connection circuit 48 connecting between the power supply input section 43 and interlocked output sections 41, 42 to be connected with the power cords of slave units 2, 3 and turned ON/OFF by means of a switch Q21. The interlocking system further comprises a current detector CT1 connected with the first connection circuit 46 to deliver a current detection signal when a current is flowing through the circuit 46, and a switch control circuit delivering a switch control signal for turning the switch Q21 ON based on an output signal from the current detector CT1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power ON / OFF interlocking device, and more particularly to a power ON / OFF interlocking device capable of interlocking ON / OFF of a master device and ON / OFF of a slave device. It is a thing.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view showing a conventional power ON / OFF interlocking device together with a master device and a slave device. In FIG. 3, reference numeral 1 is a master device such as a personal computer which starts its operation when the power switch is turned on. Reference numeral 11 denotes a service outlet, which is an outlet to which an alternating current (AC) of 100 V is supplied when the power switch is turned on. Reference numeral 12 is a power cord. Reference numeral 2 is a slave device which starts operation when the power switch is turned on, CRT display device, and 3 is also a slave device, which is a printer. 4 is power ON
The -OFF interlocking device interlocks with ON-OFF of the power switch of the master device 1 to turn ON / OFF the power supply to the slave devices 2 and 3. The power ON / OFF interlocking device 4 includes outlets 41 and 42 into which the power cords 21 and 31 of the slave devices 2 and 3 are inserted. In this specification, the power supply is turned on-of
An example of the F interlocking device is a device provided with an outlet and also a box-shaped device, and is therefore abbreviated as an outlet box. AC100V input to the outlets 41 and 42 by a power cord 43 which is a power input section
Is supplied via a switch. The switch is connected to the AC100 from the ON-OFF control terminal 44.
The ON-OFF is controlled by the switch control means that outputs the switch control signal when V is input.

FIG. 4 is a circuit diagram showing an example of a circuit of an outlet box, in which a switch is constituted by a triac Q1,
The switch control means is configured by the phototriac PC1. In FIG. 4, R1, R2, R3
Is a resistor, C1 and C2 are condesans, D1 is a diode,
D2 is a Zener diode. The triac Q1 is connected to the hot line or the neutral line. In this example, the ON-OFF control terminal 4
When AC100V is input from 4, the phototriac PC1 is driven. Then, the AC voltage divided by the resistors R3 and R2 is applied to the gate of the triac Q1 as a switch control signal. When the triac Q1 is turned on, AC 100V is applied to the outlets 41 and 42. FIG. 5 is a circuit diagram showing another example of the outlet box, in which the switch means and the switch control means are constituted by relays, and RC1 is a relay coil, RL1, R.
L2 is a relay contact.

As described above, the outlet box 4
When AC100V is applied to the service outlet in cooperation with turning on the power switch of the master device 1, the AC is output to the outlets 41 and 42 which are the interlocking output parts.
100V is applied and the power of several slave devices is turned on-
It is possible to control the OFF at once. The power switch of the slave device is always in the ON state.

[0005]

In the conventional power ON / OFF interlocking device as described above, if the master device does not have a service outlet, the power of the master device is turned ON-O.
There is a problem in that the FF and the ON / OFF of the power supply of the slave device cannot be linked. In addition, the service outlet is not necessary in the case of normal specifications, and if it becomes necessary when upgrading the system, the service outlet must be provided in the master device from the beginning, and the power supply unit of the master device is There was a problem that it resulted in over-spec and increased cost.

The present invention has been made in order to solve such a problem. Even if the master device does not have a service outlet, ON-0FF of the power supply of the slave device can be linked with ON-OFF of the power supply of the master device. It is an object of the present invention to provide a power ON / OFF interlocking device that can be operated.

[0007]

Power on according to the present invention
The -OFF interlocking device is connected to the first connecting circuit connecting the power input unit to which the power source is connected and the main output unit to which the power cord of the master device is connected, and the power input unit and the power cord of the slave device. A second connection circuit that is connected to the interlocking output section and is turned on and off by a switch; and a current detector that is coupled to the first connection circuit and outputs a current detection signal when a current is flowing. And a switch control circuit for outputting a switch control signal for turning on the switch based on the output signal of the current detector.

[0008]

According to the present invention, the current detector coupled to the first connecting circuit connecting the power input unit and the main output unit to which the power cord of the master device is connected detects that current is flowing. Based on the current detection signal, the switch control circuit turns on the switch of the second connection circuit that connects the power supply input section and the interlocking output section to which the power cord of the slave device is connected. Since the switch control signal is output, the power supply ON-OFF of the master device and the power supply ON-OFF of the slave device can be linked.

[0009]

1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing an embodiment of the present invention together with a master device and a slave device. In the figure, 1 is a master device such as a personal computer, 2 is a CRT display device which is a slave device, and 3 is a printer which is a slave device. 4a is an outlet box. 43 is a power input unit, which is an AC
It is a power cord connected to 100V. Reference numeral 41 denotes an interlocking output unit, which is an outlet into which the power cord 21 of the CRT display device 2 which is a slave device is plugged, and 42 is also an interlocking output unit which is an outlet to which the power cord 31 of the printer 3 which is a slave device is plugged. A main output unit 45 is an outlet into which the power cord 12 of the personal computer 1, which is a master device, is inserted. 46 is a power input unit 43
Is a first connection circuit that connects the main output unit 45 to the main output unit 45, and is a second connection circuit that connects the power supply input unit 43 and the interlocking output units 41 and 42.

CT1 is a current transformer, which is connected to the hot run of the first connection circuit 46 and is a current detector for detecting the current flowing through the first connection circuit 46. Q
Reference numeral 21 is a triac, which is an ON-O terminal for the second connection circuit 48.
This is a switch for performing FF. D21 is a diode for rectifying the voltage induced in the current transformer CT1, C21
Is a smoothing capacitor, PC22 is a phototriac, R
21, R22, R23 and R24 are resistors, and C22 is a capacitor. In addition, D21, C21, PC22, R21
~ R24 and C22 constitute a switch control circuit that outputs a switch control signal for turning on the triac Q21 based on the output signal of the current transformer CT1. 2 shows a master device 1, a slave device 2,
3 and the outlet box 4a are connected.

Next, the operation will be described. When the power switch of the master device 1 is turned on and a current flows through the first connection circuit 46, the resistor R24 is generated by the current transformer CT1.
AC voltage is generated on both sides of. This AC voltage is rectified and smoothed by the diode D21 and the capacitor C21,
The photo triac PC22 is driven. When the photo triac PC22 is turned on, an AC voltage is applied to the gate of the triac Q21 by being divided by the resistors R22 and R23, and the triac Q21 turns on the second connection circuit 48. From the above, even if the master device 1 does not have a service outlet, the power of the slave devices 2 and 3 can be controlled to be turned on and off in synchronization with the turning on and off of the power switch of the master device 1. The ON / OFF operation of power supply to the interlocking output parts 41 and 42 of the outlet box 4a is performed by the current transformer CT1.
By setting the resistor R24 and the resistor R24, the phototriac PC22 is turned on and off with an arbitrary current value flowing in the main output section 45.
Therefore, the interlocking output section 4 of the outlet box 4a can be adjusted according to the current value used in the master device 1.
It is possible to turn on and off the power supply to the power supply terminals 1, 42.

[0012]

As described above, according to the present invention, the current detector coupled to the first connection circuit for connecting the power input unit and the main output unit to which the power cord of the master device is connected is operated by the current detector. Is detected and outputs a current detection signal,
The switch control circuit outputs the switch control signal for turning on the switch of the second connection circuit that connects the power supply input unit and the interlocking output unit to which the power cord of the slave device is connected, based on the current detection signal. , Even if the master device does not have a service outlet, power on the master device-
There is an effect that it is possible to interlock OFF and power ON / OFF of the slave device. Further, there is an effect that the cost can be reduced as compared with the case where a signal is obtained from a service outlet and linked.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram illustrating an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional power ON / OFF interlocking device.

FIG. 4 is a circuit diagram of a conventional power ON / OFF interlocking device.

FIG. 5 is another circuit diagram of a conventional power ON / OFF interlocking device.

[Explanation of symbols]

 1 Master device 2, 3 Slave device 4a Power ON-OFF interlocking device 41, 42 Interlocking output part 43 Power supply input part 45 Main output part 46 First connection circuit 48 Second connection circuit CT1 Current detector Q21 switch

Claims (2)

[Claims] 1. A main output unit to which a power cord of a master device is connected, and an interlocking output unit to which a power cord of a slave device is connected, and detects a current flowing from the main output unit to the master device. A power ON / OFF interlocking device comprising means for turning on a circuit for supplying power to the interlocking output section. 2. A first connecting circuit connecting a power input unit to which a power source is connected and a main output unit to which a power cord of a master device is connected; and an interlocking system in which the power input unit and a power cord of a slave device are connected. Connects to the output section and turns on and off with a switch
A second connection circuit that performs the operation, a current detector that is coupled to the first connection circuit and outputs a current detection signal when a current is flowing, and the switch based on the output signal of the current detector. O
A power ON-OFF interlocking device, comprising a switch control circuit for outputting a switch control signal for setting to N.