JPS61240520A - Operation control for relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for controlling the operation of a relay that switches on and off current, and in particular, it relates to a method for controlling the operation of a relay that switches on and off current. This is related to a control method that never fails.

[Conventional technology]

As a conventional relay operation control method, it is common to simply turn on and off the energization to the excitation coil of the relay using a switch or the like. Furthermore, a control method is known in which a time constant circuit is provided in the electric path of the excitation coil to reduce the power consumption when the relay is maintained in operation.

[Problem that the invention seeks to solve]

In conventional relay operation control methods, when switching contacts for relay operation, the movable contact contacts the fixed contact at high speed, causing a chuckling phenomenon due to the contact bouncing, resulting in contact damage and loud operating noise. There was an inconvenience caused by this. Furthermore, when the conventional relay operation control method is applied to a power supply circuit of an electronic device, there is a problem in that the electronic circuit malfunctions due to noise generated by the chattering phenomenon.

[Means for solving problems]

By controlling the current in the excitation coil of the relay (ON> and OFF) during the movement of the movable contact, a brake is applied to the movement of the movable contact, and the speed when the movable contact contacts the fixed contact is moderated. It is characterized by deceleration.

[For production]

When the switch of the control circuit is turned on, the current in the excitation coil of the relay is turned on by the output signal of the control circuit. Then, the armature is attracted by the magnetic force generated in the excitation coil, and the movable contact fixed to the armature spring starts moving in the direction of the normally open movable contact. After a certain period of time, the output of the control circuit is reversed, the current in the exciting coil is turned off for a short time, and the movement of the movable contact is braked.

Furthermore, when the current in the excitation coil is switched from OFF to ON again, the movable contact contacts the normally open fixed contact at an appropriate speed. The above operations are performed instantaneously, and the relay is activated. Furthermore, when the control circuit switch is turned OFF while the relay is in operation, the current in the excitation coil is turned OFF, the magnetic force of the excitation coil disappears, and the elastic force of the armature spring causes the movable contact to move toward the normally closed contact. Moving.

After a certain period of time, the output of the control circuit is reversed and the current in the exciting coil is turned on for a short time. Then, the movement of the movable contact is braked by the magnetic force generated in the excitation coil, and the movable contact contacts the normally closed fixed contact at an appropriate speed.

〔Example〕

First, an outline of the relay to be controlled will be explained with reference to FIG. The lower end of the yoke 1 is connected to the board 3 by screws 2.
A core 5 is inserted through the excitation coil 4, and the excitation coil is attached to the yoke 1 via the core 5. The armature 6 is fixed to an armature spring, and one end of the armature spring 7 is connected to a screw 9.
The armature spring 7 is fixed to the upper end of the yoke 1, and a movable contact 10 is fixed to the other end of the armature spring 7.

The normally closed side fixed contact 11 and the normally open side fixed contact 12 are connected to the board 3
The movable contact 10 and the fixed contact 11 are in contact with each other when not in operation, and the movable contact 10 and the fixed contact 12 are in contact with each other to switch the electric circuit.

Next, the control method of the present invention will be explained with reference to the control circuit shown in FIG. The control circuit 13 has a switch circuit 14, a first
It consists of a delay circuit 15, a second delay circuit 16, a logic circuit 17, and a drive circuit. The drive circuit 18 is connected to the excitation coil 4 of the relay shown in FIG. 1 and a diode 4a for absorbing back electromotive force. 19 is a power supply wiring connected to the anode of a DC power supply (not shown).

The switch circuit 14 has a switch 141 and a resistor 142, and the switch 141 (7) is turned on and off as shown in FIG.
With the switching operation of W, the voltage shown in FIG. 2(a) is output to point A. The first delay circuit 15 includes a capacitor 151, resistors 152 to 154, a diode 155, and an inverter 156, and when the voltage at point A switches,
The voltage at the point changes with a time constant determined by the capacitor 151 and the resistor 152, resulting in the voltage waveform shown in FIG.
The voltage waveform of is output. The delay circuit 16 in FIG. 2 includes a capacitor 161, resistors 162 to 164, and a diode 165.
When the voltage at point C is switched, the voltage at point D changes with a time constant determined by the capacitor 161 and resistor 163, resulting in the voltage waveform shown in FIG. 2(d). The voltage waveform shown in Figure (e) is output. The logic circuit 17 includes AND circuits 171 to 173 and an OR circuit 174.
Figure 2 (5) with input voltages at points A, C, and E.
It is designed to output the voltage waveform shown in .

That is, in FIG. 2, switch 141 is turned off at time t1.
N, the voltage at point A changes from H to L, and the voltage at point B gradually changes from H to L. Time t after a certain period of time has elapsed
2, the voltage at point C changes from L to H, the voltage at the point gradually changes from L to H, and then after a certain period of time, at time t3, the voltage at point E changes from H to L. . Then, the voltage at point F changes from L to H at time t1, then to H at time t2, and then to H at time t3. Further, when the switch 141 is turned off at time t4, the voltage at point F changes from H to L at time t4, H1 at time t5, and H at time t6, similar to the above-described operation.

Note that the time t1 to t3 and the time t4 to t6 are the time during which the movable contact 10 of the relay moves with the operation (approximately 20 m).
5) It is set shorter.

FIG. 4 is a diagram showing voltage waveforms when the control method of the present invention is applied to a relay with a rating of 12×16 A and a gear of 1.61111 between contacts. In FIG. 3, the second
When the voltage (f) at point F in the figure changes from L to H, an exciting current flows through the exciting coil 4, the armature 6 is absorbed by the generated magnetic force, and the movable contact 10 moves toward the normally open fixed contact 12. Start moving to . When the mold pressure <f) changes from H to L for 0.8 ms 1'6.5 ms before the movable contact 10 reaches the fixed contact 12, a brake is applied to the moving speed of the movable contact 10, and 19. At time tlo 5 ms later, the movable contact 10 contacts the fixed contact 12 at an appropriate speed, and the switching output (g) of the relay is switched.

Note that Figure 4 shows the operation of the relay switching from OFF to ON, but when the relay switches from ON to 0FF, the voltage waveform (f) H and L are only reversed, and the same behavior occurs. Perform the action.

FIG. 5 shows a flowchart for implementing the control method of the present invention using a microcomputer.

The first timer and second timer in Fig. 5 are the same as the first timer in Fig. 2.
Corresponding to the functions of the delay circuit and the second delay circuit, the output signal shown in Fig. 2 is generated by combining each timer signal and logical judgment.
An output similar to voltage waveform (f)] can be obtained.

〔Effect of the invention〕

As is clear from the above explanation, in the relay operation control method of the present invention, the movement of the movable contact is braked for a short time and decelerated before the movable contact contacts the fixed contact. The relay output switches when it comes into contact with a fixed contact at a speed that does not cause chattering or signal noise, and it also has the effect of preventing contact damage and loud operating noise caused by chattering. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing a relay to be controlled, FIG. 2 is a diagram showing a control circuit ' employing an embodiment of the present invention, and FIG. 3 is a diagram showing each voltage waveform in the control circuit of FIG. 2.
FIG. 4 is a diagram showing voltage waveforms in an embodiment of the present invention. FIG. 5 is a diagram showing an example of a flowchart when the present invention is implemented using a microcomputer. [Explanation of symbols] 4... Excitation coil, 13... Control circuit, 14...
Switch circuit 15.16...Delay circuit, 17...Logic circuit

Claims (1)

[Claims] 1. The current in the excitation coil of the relay is reversed from ON to OFF or from OFF to ON for a short time while the movable contact is moving, thereby slowing down the moving speed of the movable contact.
How to control relay operation. 2. The excitation current of the relay is turned on and off by a logic output that is a combination of a switch output, a first delayed output based on the switch output, and a second delayed output that is further delayed from the first delayed output. A method for controlling the operation of a relay according to claim 1.