JPH03143234A - Multi-circuit controller - Google Patents

Abstract

PURPOSE:To interrupt fine leakage currents, and to obtain an interruption function equal to a mechanical contact by connecting a machine switch to a semiconductor switch and opening the machine switch in conformity with the switching of the semiconductor switch. CONSTITUTION:A remote-control 10 has semiconductor switches 13-1 to 13-4 such as terminal bi-directional thyristors for switching load connected to the terminals 10-1 to 10-4 of a branch circuit, and a mechanical switch Ra is inserted between a semiconductor switch group and the terminal 14 of the power supply of load. The switch Ra is operated interlocked with a changeover switch 11, closed when a needle Rb is brought into contact with a contact Rb-1, and opened when the needle is brought into contact with a contact Rb-2. Accordingly, a long lifetime can be kept even when load is switched frequently, the leakage of currents is reduced, and energy can be conserved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a multi-circuit control device, such as a lighting control device, which frequently opens and closes many branch circuits.

[Prior Art] FIG. 2 is a circuit diagram of a conventional multi-circuit control device disclosed in, for example, Japanese Unexamined Patent Publication No. Sho 62-1.93481. in general,
The multi-circuit control device includes, for example, four remote control switches 1-
1. 1-2, 1-3 and 14, and remote control relays Ry-1, Ry-2, Ry-3 and R7-4 which are connected to each remote control switch in a one-to-one manner and are activated by operating them. ing. Each remote control relay Ry
-1, Ry-2, Ry-3 and Ry-4 are respectively provided with switches Ra-lRa-2, Ra-3 and Ra-4, and the loads connected to them (loads in Figure 2) ) are the respective remote control switches 1-1, 1-2. It is opened and closed by operating 1-3 and 1-4. Generally, a remote control switch and a remote control relay are provided at separate locations. The operation of this device will be explained with respect to a set of remote control switch 1-1 and remote control relay Ry-t.

First, when the push-button switch Swl is pressed, the conductive wire 21 and the conductive wire 3 are connected by the diode DaS and the switch Swl connected in series. On the other hand, remote control relay R
In y-1, the mover Rb-1 is connected to the cathode of the diode Da, and the power supply 4 → the conductor 5 → the coil L
1→diode Da→mover Rb-1→conductor 2-1→diode Das→switch Swl→conductor 3 and power source 4 is formed. As a result, current flows only during the half-wave period of the power source 4, and the coils I, 1 are excited.

By excitation of the coil L1, the movable element Rb-1 is switched from the cathode of the diode Da to the anode of the diode Db, and the switch Ra-1 interlocked therewith is opened.

As a result of the movable element Rb-1 being connected to the anode of the diode Db, the current is blocked by the diode Db connected with the opposite polarity to the diode Da, and the electric path is cut off. Does remote control relay Ry-1 excite coil Ll after mover Rb-1 operates? Since the state is maintained even if r4I&, the mover Rh-1 is connected to the diode Db.
remains connected to the anode of the Even if the switch Swl is pressed again in this state, the electric circuit is not formed and the remote control relay Ry-t does not operate.

To activate the remote control relay Ry-1 again, press the switch Sw2. As a result, an electric path is formed from power source 4 to remote control switch 1-1 to remote control relay Ry-1 to power source 4, current flows through coil L1, and mover Rb-
Activate 1. As a result, the movable element Rb-1 is switched from the anode of the diode Db to the cathode of the diode Da, and the switch Ra-1 is closed to return to the original state. The above operation applies to other remote control switches 1-2.1-3
and 1-4 and other remote control relays Ry-2, Ry-3
The same applies to each set of RY-4 and RY-4.

[Problems to be Solved by the Invention] The conventional multi-circuit control device requires a large amount of energy to drive the remote control relay Ry-1, and the switch Ra-1 that opens and closes the load is a mechanical contact, so it cannot be used frequently. They had short lifespans, low reliability, and high maintenance costs, making them uneconomical.

The purpose of this invention is to make the switch non-contact by using a semiconductor switch, and to provide a means for interrupting minute leakage current that is generally unavoidable in non-contact switching, thereby obtaining a breaking function equivalent to that of a mechanical contact. do.

[Means for Solving the Problems] The multi-circuit control device of the present invention provides a multi-circuit control device for controlling one of the commonly connected semiconductor switches of a plurality of semiconductor switches, each of which has one terminal connected in common and the other terminal connected to each load. A control circuit is provided that connects a switch between the terminal and the power source, closes the switch when at least one semiconductor switch is closed, and opens the switch when all the semiconductor switches are open.

[Function] The load is switched on and off using long-life semiconductor switches, and when all the semiconductor switches are open, the circuit is completely disconnected from the power source by opening the circuit with a mechanical switch.

[Embodiment] FIG. 1 shows a circuit according to an embodiment of the present invention. In the figure,
For example, 4 remote control switches 1-1.1-2゜1-3
and 1-4 all have the same configuration and are considered "prior art"
The remote control switch 1-1 is the same as the one mentioned above and is generally widely known, but the details will be explained regarding the remote control switch 1-1.

A series connection of a diode D1 and a pushbutton switch Swl and a series connection of a diode D2 and a pushbutton switch Swl = 55w2 are connected in parallel so that the diodes D1 and D2 have opposite polarities. The series connection body further includes a series connection body of a light emitting diode LDI used as an indicator light and a resistor R1, and a light emitting diode LD.
2 and a resistor R2 are connected in parallel such that the light emitting diodes LDI and LD2 have opposite polarities.

Remote control switch 1. -1 is connected to one terminal of an AC power source 4 via a conductor 3, and the other terminal of the remote control switch 1-1 is connected to a remote control relay 10 via a conductor 2-1. . In the diagrams of all remote control switches 1-1.1-2.13 and 1-4, the lower terminals are commonly connected to conductor 3, and the upper terminals are connected to the respective conductors 2-1.2-2 and 2-4. Similarly, it is connected to the remote control relay 10 via the remote control relay 10.

The remote control relay 10 is connected to the terminal 10-1.10- of the branch circuit.
2゜Equipped with semiconductor switches 13-1.13-2.13-3 and 13-4 such as 3-terminal bidirectional cyrisks for opening and closing loads (not shown) connected to 1O-3 and 10-4. A mechanical switch Ra is inserted between the semiconductor switch group and the load power supply terminal 14. switch Ra
is operated in conjunction with the changeover switch 11, and its mover Rh
is in contact with contact Rb-1, it is silent, and contact Rb-
When it touches 2, it becomes a period. The mover Rb is the mover R
It is driven by the excitation of the coil L connected between the control circuit 12 and the control circuit 12, and once it comes into contact with the contact point Rb-1 or Rb-2, it maintains that state even if the excitation of the coil L disappears. ing. Contacts Rb-1 and Rb-2 are diodes Rd1 and Rd-2 connected with opposite polarity to each other.
It is connected to the control circuit 12 via.

Each of the four input terminals of the control circuit 12 is connected to a conductor 2-1.
, 2-2, 2-3 and 2-4 are connected, and the output terminal 12
-1.12-2.12-3 and 12-4 are connected to respective gates of semiconductor switches 13-1.13-2.13-3 and 13-4.

The operation of this embodiment will be explained next. Now, with all semiconductor switches 13-1.13-2.13-3.13-4 open and switch Ra also open, turn switch Sw2 of remote control switch 1-1 to the lever position. Then, the half-wave current of the power supply 4 flows into the control device 12 through the diode D2, and the semiconductor switch 13-1 is turned on!・A voltage is applied to the semiconductor switch, and the control circuit 12-coil L-mover Rb→diode Rd-2
→Electricity iQ flows through the path of the control circuit 12, and the movable element Rb is switched to the contact point Rb-1. As a result, the interlocking switch Ra is closed, and current flows from the power source 4 to the load connected to the terminal l0-1. Other terminals 10-2, 10-3 or 1
Switch Sw2 of each remote control switch l-2, 1, -3 or l-4 also for the load connected to O-4.
Similarly, it can be energized by closing .

The control circuit 12 includes semiconductor switches 13-1. H-2,1
When at least one of 3-3 and 13-4 is idle, the movable element Rb is kept in contact with the contact Rb-1, and the switch Ra is kept closed.

Next, in a state where only one semiconductor switch, for example 13-4, is closed and the pond is open, the operation when opening the semiconductor switch 13-4 will be described below. First, when the switch Swl of the remote control switch 14 is closed, the half-wave current of the power supply 4 flows through the diode Dl to the control circuit 12, the gate voltage of the semiconductor switch 13-4 is made zero, and the semiconductor switch 13-4 is opened. do. Next, the control circuit 12 controls all the semiconductor switches 13-1, 13-
2. When detecting that the gate voltages of 13-3 and 13-4 are zero, the control circuit 12-diode Rd-
1 - Mover Rb - Coil L - A current is passed through the control circuit 12 to switch the mover Rb to contact Rb-2. As a result, the switch Ra is opened, and the circuit between the load power supply terminal 14 and the semiconductor switches 13-1, 13-2, 13-3 and 13-4 is completely cut off.

In addition, although four remote control switches and four remote control relays are provided in the embodiment of the multi-time & δ control device described above, the number is not limited to this number.

[Effect of the Invention] According to the present invention, the branch circuit includes semiconductor switches 13-1.
, , so that even if the loads connected to the branch circuit are frequently switched on and off, it will not wear out and have a long life, and when all the loads are switched off, the semiconductor Switch 13-1.
Since the branch circuit is disconnected from the power supply by the mechanical switch Ra, which has higher insulation than , , there is no leakage of current when it is off, and since it is a semiconductor switch, opening and closing can be done with extremely little power, which saves energy. .

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of a multi-circuit control device according to the present invention, and FIG. 2 is a circuit diagram of a conventional multi-circuit control device. In the figure, 13-1.13-2.13-3.13-4 is a semiconductor switch, Ra is a switch, and 12 is a control circuit.

Claims (1)

[Claims] (1) a plurality of semiconductor switches having one terminal commonly connected and the other terminal connected to each load; a switch connected between the commonly connected one terminal and a power supply; and at least one A multi-circuit control device comprising: control means that closes the switch when the semiconductor switch is closed, and opens the switch when all the semiconductor switches are open.