JPH0547280A - Relay device - Google Patents

Abstract

PURPOSE:To provide a noise-reduced constitution for a relay by giving a simple improvement to a circuit instead of giving a structural improvement. CONSTITUTION:A relay 1, a pulse generating circuit 5, and a drive circuit 7 for giving a pulse drive power supply based on a pulse signal from the pulse generating circuit 5 to the relay 1 in the first transition and last transition of input signals for driving the relay 1, and giving a constant drive holding power supply between them are provided. When actuation of the relay is stopped, the suction force of the coil is restored instantaneously, and a suction/ removal speed of a movable member to the coil is reduced, thereby a collision noise by a relay action is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent structure when a relay is activated.

[0002]

2. Description of the Related Art When a relay operates, a collision sound is generated when the movable piece is attracted to the excited coil side, and a collision sound is generated between the movable contact and the fixed contact when the movable piece swings.
Such a collision sound is very annoying in a quiet environment, and various silent configurations for reducing the collision sound have been considered.

[0003]

However, the conventional silent structure has been obtained by improving the movable piece and the contact material and interposing the spring material for mitigating the collision. However, the material of the parts is limited and the cost is low. There is a problem that the cost becomes high, the structure becomes complicated, it takes time to assemble, and a failure occurs.

The present invention solves the above problems, and an object thereof is to obtain a silent structure of a relay by a simple improvement in the circuit without structural improvement.

[0005]

In order to achieve the above object, according to the present invention, a relay device includes a relay, a pulse generating circuit, and the relay when the input signal for driving the relay rises and falls. A pulsed drive power source based on a pulse signal from the pulse generation circuit and a drive circuit for supplying a constant drive hold power source during the period are provided.

[0006]

According to the structure of the present invention, when the input signal for driving the relay rises and falls, a pulsed driving power source based on the pulse signal from the pulse generating means is applied to the relay, and the coil is activated at the start of the operation of the relay. Attracting force of the coil decreases momentarily, and when the relay stops operating, the coil attracting force restores for a moment, so that the movable piece is attracted to the coil.
The speed of both movements away from the coil is reduced, which reduces the collision noise associated with the movement of the movable piece.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a circuit configuration of a relay device of the present invention, 1 is a relay, 2 is a coil of the relay VA, VB, V
A voltage setting circuit for supplying a set voltage driving power source for each C
3 is a power supply circuit for supplying the voltage setting circuit 2 with driving power for the relay 1, 4 is a control unit for generating an input signal for driving the relay 1, 5 is a pulse generation circuit, and 6 is a frequency division generated by the pulse generation circuit 5. A frequency dividing circuit for generating a pulse having a set width t1, t2, t3, t4 by dividing the pulse by each set time, 7 is a voltage based on the input signal from the control unit 4 and the pulse from the frequency dividing circuit 6. This is a drive circuit that gives a drive command signal to the setting circuit 2.

The operation of the relay device will be described below with reference to the time chart of FIG.

S1 is an input signal generated by the control unit 4, S2
Is a drive command signal generated by the drive circuit, S3 is a set voltage drive power supply signal generated by the voltage setting circuit, and S4 and S5 are output signals of the normally open contact and the normally closed contact of the relay.

In the state where the input signal S1 is not input, the frequency division pulse from the frequency division circuit 6 is given, but the drive circuit 7
Does not generate the drive command signal S2, the relay 1 does not operate, and only the normally closed contact outputs (signal S5).

When the input signal S1 is input, the drive command signal S2 synchronized with the first divided pulse signal (setting width t1) obtained based on the rising timing thereof is given to the voltage setting circuit 2. When the drive command signal S2 is applied, the voltage setting circuit 2 applies the pulse-shaped (t1 width) set voltage drive power supply signal S3 of the set voltage VA to the relay 1 in synchronization with the drive command signal S2.

Then, the drive command signal S2 is stopped during the second divided pulse signal (setting width t2) after the lapse of t1 time, and then continuously while the input signal S1 is being applied again. S2 is output. In response to this, the voltage setting circuit again supplies the relay 1 with the set voltage driving power supply signal S3 of the set voltage VC as the holding voltage power supply after the output is stopped for t2 hours.

From the voltage setting circuit 2 to the relay 1 as described above.
When the driving power is applied to the movable piece, the movable piece of the relay 1 operates between T1 and T2 by the attraction force of the coil, the output signal S5 of the normally closed contact is stopped at the beginning of the operation, and the output signal of the normally open contact when the operation is stopped. S4 is obtained. Then, the approaching speed of the movable piece toward the coil side at the time of attraction is reduced because the driving power source is stopped for t2 hours after the driving power source is applied for t1 hours and the attraction force of the coil is slightly weakened.
Both the collision noise of the movable piece on the coil side and the collision noise of the movable contact on the normally open contact are reduced.

When the input signal S1 is stopped, the drive command signal S2 is stopped during the third frequency-divided pulse signal (setting width t3) based on the timing of its fall, and then the fourth signal. The drive command signal S2 synchronized with the frequency-divided pulse signal (setting width t4) is given to the voltage setting circuit 2. When the drive command signal S2 is applied, the voltage setting circuit 2 applies the pulse-shaped (t4 width) set voltage drive power supply signal S3 of the set voltage VB to the relay 1 in synchronization with the drive command signal S2.

From the voltage setting circuit 2 to the relay 1 as described above.
When the driving power is applied to the movable piece, the movable piece in the relay returns to the operation between T3 and T4 with the release of the attraction force of the coil, and the output signal S4 of the normally open contact is stopped at the beginning of the operation by stopping the output of the driving power, When the operation is stopped, the output signal S5 of the normally closed contact is obtained. The speed at which the movable piece separates from the coil side is reduced because the driving power is applied for t4 hours after the driving power supply is stopped for t3 hours, and the attraction force of the coil is restored once. Collision noise to the contacts is reduced.

In the above embodiment, if t1 and t4 are set short and VA and VB are set large, a higher silent effect can be obtained. Further, t2 may be 0. Further, when VA is increased, the separation speed between the normally closed contact and the movable contact is increased, the arc generation time between the contacts is reduced, and the contact life is improved.

[0017]

As described above, according to the present invention, the pulsed driving power is applied at the rising and falling edges of the input signal for driving the relay, and the attraction force of the coil at the start of operation of the relay is momentarily increased. In addition, the suction force of the coil is restored for a moment when the relay operation is stopped, and the speed of both the operation of adsorbing the movable piece to the coil and separating it from the coil is moderated. Collision noise due to relay operation is reduced without making improvements,
As a result, the noise reduction effect of the relay is improved with a low cost and a simple configuration.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a relay device according to the present invention.

FIG. 2 is a time chart for explaining the operation of the present invention.

[Explanation of symbols]

 1 Relay 5 Pulse generator 7 Drive circuit

Claims (1)

[Claims] 1. A relay (1), a pulse generation circuit (5), and the pulse generation circuit (5) in the relay (1) at the rising and falling edges of an input signal for driving the relay (1). A relay device comprising: a pulse-shaped drive power source based on a pulse signal from the drive circuit; and a drive circuit (7) for applying a constant drive holding power source during the period.