Relay anti-adhesion control device based on silicon controlled rectifier

Abstract

The utility model discloses a silicon controlled rectifier-based relay anti-adhesion control device, which comprises a processing system, a silicon controlled rectifier, an optocoupler isolation control circuit, a normally open contact, an electromagnet, a resistor, a load working power supply input end, a load working power supply output end, a direct-current power supply V1 end, a direct-current power supply V2 end and a direct-current power supply cathode grounding end, a silicon controlled rectifier and a normally open contact are adopted as main switching devices to replace a traditional mechanical contactor, during circuit breaking, the non-impact breaking process is achieved by accurately controlling the turn-off time of the silicon controlled rectifier, the reflection impact of the contactor during sudden breaking of large current is avoided, the silicon controlled rectifier is accurately controlled through an optocoupler isolation control circuit, and the service life of the contactor is prolonged. The controllable silicon and the relay are connected in parallel, the controllable silicon is only switched instantly, a large amount of heat cannot be generated, large heat dissipation measures are not needed, space is saved, the service life of the controllable silicon can be prolonged, and the control cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a relay anti-adhesion control device based on a thyristor. Background Art

[0002] Traditional electromagnetic starters and motor circuit breakers mostly use mechanical contacts as contact devices for opening and closing. However, when the load current is large, serious contactor reflection shock and arc adhesion problems will occur, which seriously shorten the service life of the product. Although solid-state relays do not have this problem, they are made of semiconductor devices. After the semiconductor devices are turned off, there may still be leakage currents of several microamperes to several milliamperes, which cannot achieve ideal electrical isolation. In addition, the cost of solid-state relays is relatively high. In order to solve the problems of short life of traditional relays, high cost of fixed relays and leakage current, it is an urgent problem for technicians in this field to solve. Utility Model Content

[0003] In order to overcome the above defects, the utility model provides a thyristor-based relay anti-sticking control device, which can effectively solve the serious contactor reflection impact and arc adhesion problems existing in the existing electromagnetic starter.

[0004] The utility model adopts the following technical solution to solve the technical problem: a relay anti-adhesion control device based on thyristor, comprising a processing system, thyristor, an optical coupling isolation control circuit, a normally open contact, an electromagnet, a resistor, a load working power input terminal, a load working power output terminal, a DC power supply V1 terminal, a DC power supply V2 terminal and a DC power supply negative ground terminal, wherein the first anode terminal of the thyristor is connected to the load working power input terminal, the control terminal of the thyristor is connected to the optical coupling isolation control circuit, and the second anode terminal of the thyristor is connected to the load working power output terminal; one end of the normally open contact for controlling the start and stop of the relay is connected to the load working power input terminal The normally open contact is connected to the output terminal of the load working power supply, one end of the electromagnet is connected to the DC power supply V1 terminal, and the other end of the electromagnet is connected to the negative ground terminal of the DC power supply. The electromagnet is energized to attract the normally open contact, so that the normally open contact is closed and turned on. One end of the optocoupler isolation control circuit is connected to the DC power supply V2 terminal, and the other end of the optocoupler isolation control circuit is connected to the negative ground terminal of the DC power supply. The load working power supply input terminal is connected to the optocoupler isolation control circuit through the resistor. The optocoupler isolation control circuit is used to control the conduction or disconnection of the thyristor. The processing system controls the DC power supply V2 terminal and the DC power supply V1 terminal to be powered in sequence.

[0005] As a further improvement of the present utility model, the optocoupler isolation control circuit includes a bidirectional trigger diode and a light-emitting diode, one end of the bidirectional trigger diode is connected to the load working power input terminal through the resistor, the other end of the bidirectional trigger diode is connected to the control end of the thyristor, one end of the light-emitting diode is connected to the DC power supply V2 terminal, and the other end of the light-emitting diode and the electromagnet are connected to the negative ground terminal of the DC power supply.

[0006] As a further improvement of the present invention, the processing system is a single chip microcomputer, the P0 terminal of the single chip microcomputer is connected to the V1 terminal of the DC power supply, and the P1 terminal of the single chip microcomputer is connected to the V2 terminal of the DC power supply.

[0007] As a further improvement of the utility model, the thyristor is connected in parallel with the relay.

[0008] As a further improvement of the present invention, the power supply time of the DC power supply V2 is less than 0.1 second.

[0009] The beneficial effects of the utility model are as follows: the utility model adopts thyristors and normally open contacts as the main switching devices, replacing the traditional mechanical contactors. When the circuit is disconnected, the disconnection process without impact is realized by accurately controlling the off time of the thyristors, avoiding the reflected impact of the contactor when the large current is suddenly disconnected. The utility model is also used with the thyristor in conjunction with an optocoupler isolation control circuit. The optocoupler isolation control circuit realizes precise control of the thyristor, has strong anti-interference performance, and can effectively avoid mechanical adhesion. Compared with the existing thyristor series anti-adhesion relay technology, the technical solution of the utility model has the significant advantages of saving space and increasing the life of the thyristor because the thyristor only switches instantly and does not require large heat dissipation measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of a thyristor-based relay anti-adhesion control device of the utility model;

[0011] Figure 2 It is a control principle diagram used in the circuit of the utility model;

[0012] Figure 3 This is a power-on and power-off timing diagram provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0013] Embodiment: A thyristor-based relay anti-adhesion control device comprises a processing system 1, a thyristor 2, an optical coupling isolation control circuit 3, a normally open contact 4, an electromagnet 5, a resistor 6, a load working power input terminal 7, a load working power output terminal 8, a DC power supply V1 terminal 9, a DC power supply V2 terminal 10 and a DC power supply negative ground terminal 11, wherein the first anode terminal of the thyristor 2 is connected to the load working power input terminal 7, the control terminal of the thyristor 2 is connected to the optical coupling isolation control circuit 3, and the second anode terminal of the thyristor 2 is connected to the load working power output terminal 8; one end of the normally open contact 4 for controlling the start and stop of the relay is connected to the load working power input terminal 7, and the other end of the normally open contact 4 is connected to the negative ground terminal 11 of the DC power supply. The load working power supply output terminal 8 is connected, one end of the electromagnet 5 is connected to the DC power supply V1 terminal 9, and the other end of the electromagnet 5 is connected to the DC power supply negative ground terminal 11. The electromagnet 5 is energized to attract the normally open contact 4, so that the normally open contact 4 is closed and turned on. One end of the optocoupler isolation control circuit 3 is connected to the DC power supply V2 terminal 10, and the other end of the optocoupler isolation control circuit 3 is connected to the DC power supply negative ground terminal 11. The load working power supply input terminal 7 is connected to the optocoupler isolation control circuit 3 through the resistor 6. The optocoupler isolation control circuit 3 is used to control the conduction or disconnection of the thyristor 2. The processing system 1 controls the DC power supply V2 terminal 10 and the DC power supply V1 terminal 9 to be powered sequentially.

[0014] When the load device needs to be powered by strong electricity, a DC power is supplied to the DC power supply V2 terminal 10. At this time, the optical coupling isolation control circuit 3 is powered and the thyristor 2 is turned on. The load is powered on, and then a DC power is supplied to the DC power supply V2 terminal 10. Since the current has been conducted through the thyristor 2, no spark will be generated when the relay is turned on. Finally, the DC power supply of V2 is turned off. A complete power-on process is completed.

[0015] The optocoupler isolation control circuit 3 is used in conjunction with the thyristor 2. The optocoupler isolation control circuit 3 realizes precise control of the thyristor 2, has strong anti-interference performance, and can effectively avoid mechanical adhesion.

[0016] The optical coupler isolation control circuit 3 includes a bidirectional trigger diode 31 and a light emitting diode 32, one end of the bidirectional trigger diode 31 is connected to the load working power input terminal 7 through the resistor 6, the other end of the bidirectional trigger diode 31 is connected to the control end of the thyristor 2, one end of the light emitting diode 32 is connected to the DC power supply V2 terminal 10, and the other end of the light emitting diode 32 and the electromagnet 5 are connected to the DC power supply negative ground terminal 11. The optical coupler isolation control circuit 3 uses the bidirectional trigger diode 31 to achieve precise control of the thyristor 2, and the light emitting diode 32 can be used to display whether the control circuit is powered on, so as to avoid the failure of the optical coupler isolation control circuit 3 and the inability to effectively control the thyristor 2.

[0017] The processing system 1 is a single chip microcomputer, a P0 terminal of the single chip microcomputer is connected to a DC power source V1 terminal 9 , and a P1 terminal of the single chip microcomputer is connected to a DC power source V2 terminal 10 .

[0018] The thyristor is connected in parallel with the relay, and the control device allows the relay and the thyristor 2 to form a parallel relationship. Since the thyristor 2 and the relay are in parallel, the thyristor 2 is only switched instantly, and will not generate a large amount of heat, and no large heat dissipation measures are required, which saves space and increases the life of the thyristor 2. Moreover, since the thyristor 2 does not generate a large amount of heat, there is no need to impose additional heat dissipation measures on it, so the cost of the control device is very low.

[0019] The power supply time of the DC power supply V2 terminal is less than 0.1 second. During the power-on and power-off process of the load device, the power supply time of the DC power supply V2 terminal is preferably controlled to be less than 0.1 second to avoid damage to the thyristor due to excessive heat generation caused by the power-on time being too long and being unable to dissipate heat.

[0020] A relay anti-sticking control method using a relay anti-sticking control device based on thyristor, the specific steps are as follows:

[0021] (1) When the load device needs to be powered by strong electricity, the processing system first supplies a DC power supply V2 terminal to energize the optocoupler isolation circuit;

[0022] (2) After the optocoupler isolation circuit is started, the thyristor is turned on;

[0023] (3) When the load is powered on, the processing system immediately supplies a DC power supply V1 terminal, the electromagnet is energized to close the normally open contact, and the relay is energized to open;

[0024] (4) The processing system turns off the DC power supply of V2 to complete the relay power-on process;

[0025] (5) When the load device needs to be powered off, the processing system first supplies a DC power to the DC power supply V2 terminal to energize the optocoupler isolation circuit;

[0026] (6) After the optocoupler isolation circuit is started, the thyristor is turned on;

[0027] (7) The processing system cuts off the power to the DC power supply V1, the electromagnet loses power, the normally open contact is disconnected, and the relay loses power and stops working;

[0028] (8) The processing system cuts off the power to the DC power supply V2, and the optocoupler isolation circuit controls the thyristor to disconnect

[0029] (9) The load is powered off, completing the relay power-off process.

Claims

1. A relay anti-adhesion control device based on thyristor, characterized in that: The invention comprises a processing system, a thyristor, an optical coupling isolation control circuit, a normally open contact, an electromagnet, a resistor, a load working power input terminal, a load working power output terminal, a DC power supply V1 terminal, a DC power supply V2 terminal and a DC power supply negative ground terminal, wherein the first anode terminal of the thyristor is connected to the load working power input terminal, the control terminal of the thyristor is connected to the optical coupling isolation control circuit, and the second anode terminal of the thyristor is connected to the load working power output terminal; one end of the normally open contact for controlling the start and stop of the relay is connected to the load working power input terminal, and the other end of the normally open contact is connected to the load working power output terminal. The first end of the electromagnet is connected to the DC power supply V1 end, and the other end of the electromagnet is connected to the negative ground terminal of the DC power supply. The electromagnet is energized to attract the normally open contact, so that the normally open contact is closed and turned on. One end of the optocoupler isolation control circuit is connected to the DC power supply V2 end, and the other end of the optocoupler isolation control circuit is connected to the negative ground terminal of the DC power supply. The load working power input end is connected to the optocoupler isolation control circuit through the resistor. The optocoupler isolation control circuit is used to control the conduction or disconnection of the thyristor. The processing system controls the DC power supply V2 end and the DC power supply V1 end to be powered in sequence.

2. The thyristor-based relay anti-adhesion control device according to claim 1, characterized in that: The optocoupler isolation control circuit includes a bidirectional trigger diode and a light emitting diode, one end of the bidirectional trigger diode is connected to the load working power input terminal through the resistor, the other end of the bidirectional trigger diode is connected to the control end of the thyristor, one end of the light emitting diode is connected to the DC power supply V2 terminal, and the other end of the light emitting diode and the electromagnet are connected to the negative ground terminal of the DC power supply.

3. The thyristor-based relay anti-adhesion control device according to claim 1, characterized in that: The processing system is a single chip microcomputer, the P0 terminal of the single chip microcomputer is connected to the V1 terminal of the direct current power supply, and the P1 terminal of the single chip microcomputer is connected to the V2 terminal of the direct current power supply.

4. The thyristor-based relay anti-adhesion control device according to claim 1, characterized in that: The thyristor is connected in parallel with the relay.

5. The thyristor-based relay anti-adhesion control device according to claim 1, characterized in that: The power supply time of the DC power supply V2 is less than 0.1 second.

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