JPS60156264A - Load control circuit - Google Patents

Abstract

PURPOSE:To enable push ON and OFF from multiple positions in 2-wired type by connecting a plurality of control switches with an AC power source, connecting 2-winding relays in series, and controlling the connections of a capacity and a load by the relays. CONSTITUTION:Control switches S1, S2... are connected in parallel with an AC power source E, and 2-winding relays Ry are connected in series. Reverse current preventing diodes D1, D2 are connected in reverse direction with each other with coils r1, r2 of the relays Ry, and two capacitors are connected in parallel with the power source E from the connecting midpoints of the coils r1, r2 and the diodes D1, D2. The series circuits of the coils r1, r2 and the diodes D1, D2 are switched and connected with the power source E at the first contact X of the relay Ry, the two capacitors are switched and connected with the power source E at the second contact, and a load is controlled at the third contact Z.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a two-wire load control circuit that can brake negative aj from multiple locations.

[Background technology]

The load control circuit of this record was originally applied for in 1986-9668.
Although this was proposed in No. 6, it requires a more complicated circuit than that shown in FIG. 1 and has the disadvantage of high cost.

In addition, although the control switch is a changeover type, the a
There are many cases where it is desired to unpack directly using the contacts, and a corresponding cargo control circuit is desirable.

[Purpose of the invention]

The present invention has been made focusing on the above-mentioned problems,
It is an object of the present invention to provide a load control circuit which is a two-wire type, can be turned on and off from multiple points, has a simple circuit configuration, and can be controlled by an a contact.

[Disclosure of the invention]

The present invention is characterized in that a plurality of control switches are connected in parallel to an AC power source, a capacitor is connected to each of the coils of a two-winding relay, and the capacitor is selectively connected to the power supply line by the relay. The power supply to the V-coil itself is directionally connected and switched by the next diode and the relay contact, and the control switch is constructed by separately providing a light emitting diode to indicate the on/off state.

An embodiment of the present invention will be explained below with reference to FIG. 2.

The load control circuit has a two-winding relay Ry connected in series to the power lines Lll Lm of the AC power source E. The two coils JV rl and rg of this relay Ry are connected in opposite directions to the backflow prevention notiode D1+D2. The first contact X of this relay Ry is connected to switch the power supply to the relay Ry. Further, the middle point of the connection between the coil rl+rg and the diode Ds*DB is connected to capacitors C1 and C2, and is selectively connected to the negative side of the power supply line by the second contact y of the relay Ry. There is. The load is controlled by the third contact 2 of the relay Ry. R is an adjustment resistance. The control switches S1+S11 installed at the multiple hook locations are terminals T1 to T4.
They are connected in parallel through each. Each control switch Sl
182... are light emitting diodes LED1. LP01 is connected.

Next, the operation will be explained.

In the standby state, if contacts x and y are connected to terminal a, capacitor C1 will be charged via diode Di, and the light emitting diode LEDI will light up (no control is applied to the load). (indicates that)

At this time, current flows through the coil A/r1 of the relay Ry, but it does not move the needle.

Next, when any of the control switches S1 to Sn is turned on, the capacitor CI is discharged in the direction of the coil r1,
An exciting current flows through the carp 7L/rl of relay R)r, and relay Ry operates. Therefore, the first and second contacts x+y are switched to the terminal side. At the same time, the third contact 2 for load control is closed, and the load is driven. In this state, even if the control switches 81 to Sn remain on, the adjustment resistor R is large to some extent, so the electric current of the coil 1Vr2 of the relay Ry cannot be reached.
to maintain terminal 5 side. At this time, the light emitting diode LED2 lights up.

Next, when the control switches 81 to Sn are turned off, the capacitor C2 is charged by the required amount from the contact y side. At this time, the light emitting diode LED2 lights up.

Then, when the control switches 81 to Sn are turned on again, the capacitor C2 becomes '1' and the coil 7L/rl of the relay Ry is turned on.
An electric current flows through the relay RY, which inverts the contact point X.

Both y switches to the terminal a side, and the load contact @3 is closed.

As described above, the control switches 81 to 81 to Sn can be operated from any position, and the control status is also displayed. The control switches 81 to Sn can be replaced with contact signals (a contacts) of various sensors such as heat, smoke, and bath water level.

〔Effect of the invention〕

As described above, according to the present invention, color number control switches are connected in parallel to an AC power source, a two-winding relay is connected in series, and diodes for backflow prevention are connected to each coil of the two-winding relay in opposite directions. Connect the two capacitors in parallel to the power supply from the midpoint of each connection between the coil and the diode,
Connect each series circuit of the coil and diode to the power source at the first contact of the two-winding relay. g2
The structure is characterized in that the two capacitors are connected to the power supply by the contact point, and the load is controlled by the third contact point, so the switch can be turned on and off from multiple points with a two-wire system, and the circuit can be switched on and off from multiple points. A load control circuit with a simple configuration was realized. Further, since the control switch only needs to be an A contact, there is an advantage that it can be directly controlled by various sensors.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional example. FIG. 2 is a circuit diagram of an embodiment of the present invention. E... Power supply s Ct * C2... Capacitor, D
l, D2...Diode Ry...2 winding relay S
1~Sn...Control switch LED1~LWDn ・
...Light emitting diode R...Adjustment resistance x, V* z
...Contact Lt+Lz...Power line. Patent applicant Matsushita Electric Works Co., Ltd. Attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] (1) A plurality of control switches are connected in parallel to an AC power source, a two-winding relay is connected in series, and a diode for backflow prevention is connected to each coil of the two-winding relay. Connect in the opposite direction, connect two capacitors in parallel to the power supply from the middle points of each connection between the coil and diode, and switch each series circuit of the coil and diode to the power supply at the first contact of the two-winding relay. A load control circuit characterized in that the second contact connects two capacitors to the power supply, and the third contact controls the load. (2) Control switch 2. The load control circuit according to claim 1, further comprising light emitting diodes connected in parallel with each other in opposite directions.