JPH0479451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an operating circuit for an electromagnetic relay that operates a polarized electromagnetic relay by remote control.

[Background technology]

The operating circuit 1' of the conventional polarized electromagnetic relay 2 has a circuit configuration as shown in Fig. 2, and a plurality of circuits similar to the operating circuit 1' are provided in parallel so that operation can be performed at other locations. be. The electromagnetic relay 2 includes a main contact 3 inserted in series in a power supply circuit on the controlled circuit side, a coil 4 that opens and closes the main contact 3, and a coil 4.
diode _D1 , which determines the direction of the current flowing in
D ₂ and an auxiliary contact 6 that switches in conjunction with the main contact 3. Here, one end of the coil 4 is connected in series to the AC power supply 5, the anode of the diode _D1 and the cathode of the diode _D2 are connected to the other end, and the cathode of the diode _D1 and the diode
The anodes of D ₂ are connected to two connection points of the auxiliary contact 6, respectively. The operating circuit 1' has a two-contact switch 7a', one contact connected to the anode of the switching element SCR8a', the other contact connected to the anode of the diode D ₃ a, and the cathode of the diode D ₃ a connected to the other contact. A resistor R ₁ a and a capacitor C ₁ a are connected in series between the cathode of SCR8a′.
C ₁ a is connected as the cathode side of SCR8a', and the connection point between the resistor R ₁ a and the capacitor C ₁ a and the resistor R ₂ a
Connect to the gate of SCR8a′ through
A resistor is placed between the gate of 8a′ and the cathode of SCR8a′.
R ₃ a is connected. A circuit similar to this circuit is connected in parallel so that the direction of current is reversed, and is connected between the AC power source 5 and the common terminal of the auxiliary contact 6 of the electromagnetic relay 2.

The operation of this conventional circuit is as follows. Here, the state shown in FIG. 2 shows the state in which the electromagnetic relay 2 is off. First, at this time, the auxiliary contact 6 is a diode.
Since the switch 7a is on the diode _D3a side on the _D1 side, the capacitor _C1a is charged by the positive half wave of the AC power source 5. In this state, when switch 7a' is switched to SCR8a' side, the capacitor
The SCR 8a' is turned on for a certain period of time by the discharge current of C ₁ a, current flows through the coil 4 of the electromagnetic relay 2 in the direction of arrow A in the figure, the main contact 3 is turned on, and the auxiliary contact 6 is connected to the diode D ₂ Switch to the side. As the auxiliary contact 6 switches to the diode _D2 side, the circuit on the SCR8a' side turns off, and the capacitor on the SCR8b side circuit turns off.
A negative half-wave current flows to charge C ₁ b.
At this time, the main contact 3 continues to be on.
In this state, when switch 7b' is switched to _SCR8b ' side, SCR8
b' is turned on and is turned on for the discharge time of capacitor C ₁ b, a current flows in the opposite direction shown by arrow B in the figure through coil 4, main contact 3 is turned off, and auxiliary contact 6 is connected to diode D ₁ side. Switch. The electromagnetic relay 2 was remotely controlled by the operation described above.

By the way, with the configuration of the operating circuit 1' as described above, if there is no current direction switching circuit consisting of the auxiliary contact 6 and the diodes _D1 and _D2 , for example, if the switches 7a' and 7b' are turned on for a long time, , main contact 3
The coil 4 continues to be energized even after it is switched, causing problems such as disconnection of the coil 4. Therefore, with the above-described configuration of the operating circuit 1', a current direction switching circuit consisting of the auxiliary contact 6 and the diodes D ₁ and D ₂ is always required.

However, in this way, the auxiliary contact 6 and the diode
If a circuit consisting of D ₁ and D ₂ is required, there is a problem that the structure of the electromagnetic relay 2 itself becomes complicated, and there is also a problem that failures such as contact troubles are likely to occur.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its object is to provide an operating circuit for an electromagnetic relay that does not require a current direction switching circuit.

[Disclosure of the invention]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention. 2 is a polarized electromagnetic relay, which consists of a main contact 3 and a driving coil 4 for the main contact 3, and a main power supply 5.
A coil 4 is connected in series with . 1 is an operating circuit according to the present invention, in which a resistor R ₅ a is connected between the gate and cathode of the SCR 8a, and a resistor is connected between the gate and the common terminal of the two-contact switch 7a.
Connect R ₄ a and capacitor C ₃ a in series, SCR8a
Connect a diode D ₄ a between the anode of the switch 7a and the contact at one end of the switch 7a, and the anode side of the diode D ₄ a
Connect to the anode side of SCR8a and switch 7a
A resistor R ₆ a is connected between the other end and the cathode of the SCR 8a. An operating circuit 1 in which two of the above-mentioned circuits are connected in parallel with different current directions is connected to an AC power source 5.
and the coil of the electromagnetic relay 2 are connected to both ends of a series circuit.

The operation of the operation circuit 1 of the electromagnetic relay 2 having the circuit configuration described above is as follows. Here, FIG. 1 shows the state in which the electromagnetic relay 2 is off. In this state, when the switch 7a is switched to the diode D ₄ a side, the positive half-wave current of the AC power supply 5 is transferred to the diode D ₄ a →
The current flows from resistor R ₄ a → capacitor C ₂ a → resistor R ₅ a, charging capacitor C ₂ a, and this current causes SCR
8a is turned on, and the coil 4 of the electromagnetic relay 2 is connected to A in the figure.
Current flows in the direction of the arrow, driving the main contact 3,
Turn on electromagnetic relay 2. Simultaneously with this SCR8a being turned on, current flows through the SCR8a side, so charging of the capacitor C ₂ a is stopped. And SCR8
a is at the end of the positive half cycle of the AC power supply 5,
It turns off when the voltage applied between the anode and cathode becomes zero. After this, even if the switch 7a remains switched to the diode D ₄ a side, the capacitor C ₂ a
Since the battery remains fully charged, no gate current flows, and no current flows through the coil 4 either. When this switch 8a is switched to the resistor R ₆ a side, the charge in the capacitor C ₂ a is discharged by the resistors R ₆ a, R ₆ a, and R ₅ a, and it is in a standby state until the next switch 7a is turned on. Become. Note that the switches 7a and 7b are automatic return type switches.

Even when the switch 7b is switched to the diode D ₄ b side, the negative half-wave current of the AC power supply 5 flows from the diode D ₄ b → the resistor R ₄ b → the capacitor C ₂ b → the resistor R ₅ b, and the current flows to the SCR 8a side. Through the same operation as above, current flows in the direction of arrow B in the electromagnetic relay 2, turning off the electromagnetic relay 2. In this case as well, no current flows through the coil 4 once the capacitor C ₂ b is fully charged.

〔Effect of the invention〕

The present invention provides an operation circuit for a polarized electromagnetic relay in which a coil of the polarized electromagnetic relay is inserted in series with an AC power source, and the main contacts are opened/closed and held depending on the direction of the current flowing through the coil. It has a contact switch and a common terminal of the switch.
Control the SCR gate between SCR gates
Connect the CR differential circuit and connect it to one contact of the switch.
A diode is connected between the anode of the SCR in the same direction as the current direction of the SCR, and two circuits are connected in parallel with a resistor connected between the other contact and the cathode of the SCR with different current directions. Since it is connected to both ends of the series circuit of the AC power supply and the coil of the polarized electromagnetic relay, the operation circuit itself can maintain the energization time of the coil of the electromagnetic relay within a certain period of time. This eliminates the need for a current direction switching circuit consisting of an auxiliary contact and a diode, which simplifies the structure of the electromagnetic relay and improves its reliability.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of a conventional example. 1 is the operation circuit, 2
is an electromagnetic relay, 3 is a main contact, 4 is a coil, 5 is an AC power supply, 7a and 7b are switches, 8a and 8b are
SCR, C ₂ a and C ₂ b are capacitors.

Claims (1)

[Claims] 1. In the operation circuit of a polarized electromagnetic relay, in which a coil of a polarized electromagnetic relay is inserted in series with an AC power source, and the main contacts are opened/closed and held depending on the direction of the current flowing through this coil, SCR and two-contact switch are used. A CR differential circuit that controls the SCR gate is connected between the common terminal of the switch and the SCR gate, and a CR differential circuit that controls the SCR gate is connected between one contact of the switch and the SCR anode in the same direction as the SCR current direction. Two circuits each having a diode connected and a resistor connected between the other contact and the cathode of the SCR are connected in parallel with the directions of current flowing in different directions, and the AC power source and the coil of the polarized electromagnetic relay are connected in series. An operating circuit for an electromagnetic relay that is connected to both ends of the circuit.