Circuit for driving direct-current electromagnet to act by optocoupler and IGBT in ATS

Abstract

The utility model provides a circuit for driving a direct current electromagnet to act by an optical coupler and an IGBT in an ATS. The circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an optical coupler U1, a non-polar capacitor C1, a non-polar capacitor C2, a diode D1, a voltage stabilizing diode D2, an NPN triode Q1 and an IGBT Q2. An INPUT end drives an NPN triode Q1, an optical coupler U1, an IGBT Q2 and a voltage stabilizing diode D2 to work by receiving a high-level driving signal and a low-level driving signal, so that an electromagnet acts; and the resistor R4, the non-polar capacitor C2 and the optical coupler U1 form a protection loop to protect the IGBT Q2 from being burnt out by overvoltage. According to the utility model, the single-chip microcomputer sends out a control signal to control the electronic device to drive the electromagnet to act, and through efficient electromagnet action driving, compared with a relay and other mechanical devices, the safety is improved, the control time is greatly shortened, and the overall service life of the electromagnet ATS is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, and in particular relates to an optocoupler and IGBT driving DC electromagnet actuation circuit in an ATS. Background Technology

[0002] Electromagnetic ATSs utilize excitation coils for driving, resulting in rapid response times—switching within hundreds of milliseconds. They are used to detect power circuits and automatically switch one or more load circuits from one power source to another, ensuring the continuous and reliable operation of critical loads. Ensuring the reliability of electromagnetic ATSs is particularly important when used in critical power applications.

[0003] Currently, most solutions for such products on the market use relays to carry current and drive DC electromagnets. Over time, this solution will be affected by the mechanical life of the relay. Once the relay fails, the electromagnet may not be able to be controlled or the DC electromagnet coil may burn out due to prolonged current conduction. Furthermore, because relays are mechanical devices, they are affected by mechanical vibrations caused by their own movement, which can cause contact jitter. The instantaneous overvoltage generated during jitter may damage the components in the control circuit.

[0004] In summary, a driving circuit needs to be designed to solve the above problems and achieve the effect of improving safety while greatly shortening control time and increasing service life. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an optocoupler and IGBT driving DC electromagnet actuation circuit in an ATS to solve the problems of low safety and short service life of mechanical devices.

[0006] In a first aspect, this utility model embodiment provides an optocoupler and IGBT driving DC electromagnet operation circuit in an ATS, including resistors R1, R2, R3, R4, R5, R6, R7, R8, optocoupler U1, non-polarized capacitor C1, non-polarized capacitor C2, diode D1, Zener diode D2, NPN transistor Q1, and IGBT Q2;

[0007] One end of the resistor R1 is connected to the input terminal INPUT. The other end of the resistor R1, one end of the non-polarized capacitor C1, one end of the resistor R3, and the base of the NPN transistor Q1 are all connected together. The collector of the NPN transistor Q1 is connected to pin 2 of the optocoupler U1.

[0008] Pin 1 of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to a +3.3V voltage.

[0009] Pin 4 of the optocoupler U1 is connected to one end of resistor R4, and the other end of resistor R4, the cathode of diode D1, one end of non-polar capacitor C2, and the gate of IGBT Q2 are connected together; the collector of IGBT Q2 is connected to the TURN_DC- terminal.

[0010] Pin 3 of the optocoupler U1, the positive terminal of the Zener diode D2, the other end of the non-polar capacitor C2, and the emitter of the IGBT Q2 are all connected to the DC- terminal.

[0011] The other end of the non-polarized capacitor C1, the other end of the resistor R3, and the emitter of the NPN transistor Q1 are all grounded.

[0012] Preferably, the negative terminal of the Zener diode D2 is connected to the positive terminal of the diode D1, and the resistor R5 is connected between the negative terminal of the Zener diode D2 and the positive terminal of the diode D1; the other end of the resistor R5 is connected in sequence to the resistors R6, R7, and R8, and the other end of the resistor R8 is connected to the DC+ terminal.

[0013] Preferably, the input terminal INPUT receives high-level drive signals and low-level drive signals sent by the controller.

[0014] Preferably, the resistor R4, the non-polar capacitor C2, and the optocoupler U1 form a protection circuit.

[0015] The present invention provides the following beneficial effects:

[0016] This invention utilizes a microcontroller to send control signals to control electronic devices that drive the electromagnet. By using highly efficient electromagnet actuation, compared to mechanical devices such as relays, it significantly improves safety, shortens control time, and extends the overall service life of electromagnet-based ATSs.

[0017] Other features and advantages of this invention will be set forth in the following description, and some features will become apparent from the description or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection circuit for the optocoupler and IGBT driving the DC electromagnet in the ATS of this utility model embodiment. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Based on this, Embodiment 1 of this utility model provides an ATS-based optocoupler and IGBT driving DC electromagnet actuation circuit, such as... Figure 1 As shown, it includes resistors R1, R2, R3, R4, R5, R6, R7, R8, optocoupler U1, non-polarized capacitor C1, non-polarized capacitor C2, diode D1, Zener diode D2, NPN transistor Q1, and IGBT Q2.

[0022] One end of the resistor R1 is connected to the input terminal INPUT. The other end of the resistor R1, one end of the non-polarized capacitor C1, one end of the resistor R3, and the base of the NPN transistor Q1 are all connected together. The other end of the non-polarized capacitor C1, the other end of the resistor R3, and the emitter of the NPN transistor Q1 are all grounded.

[0023] Pin 1 of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to a +3.3V voltage; pin 2 of the optocoupler U1 is connected to the collector of NPN transistor Q1; pin 4 of the optocoupler U1 is connected to one end of resistor R4, and the other end of resistor R4, the negative terminal of diode D1, one end of non-polarized capacitor C2, and the gate of IGBT Q2 are all connected together; the collector of IGBT Q2 is connected to the TURN_DC- terminal; pin 3 of the optocoupler U1, the positive terminal of Zener diode D2, the other end of non-polarized capacitor C2, and the emitter of IGBT Q2 are all connected to the DC- terminal.

[0024] The negative terminal of the Zener diode D2 is connected to the positive terminal of the diode D1, and the resistor R5 is connected between the negative terminal of the Zener diode D2 and the positive terminal of the diode D1; the other end of the resistor R5 is connected to the resistors R6, R7 and R8 in sequence, and the other end of the resistor R8 is connected to the DC+ terminal.

[0025] Furthermore, the input terminal INPUT receives high-level drive signals and low-level drive signals sent by the controller.

[0026] Furthermore, the resistor R4, the non-polar capacitor C2, and the optocoupler U1 constitute a protection circuit.

[0027] Example 2: Regarding the operating circuit described in Example 1, the specific working path is as follows:

[0028] When the electromagnet needs to move, the microcontroller sends a low-level drive signal to the input terminal INPUT. At this time, the PNP transistor Q1 is turned off, and the optocoupler U1 is also turned off. The gate and emitter of IGBT Q2 directly receive the voltage provided by the Zener diode D2, that is, the collector and emitter of IGBT Q2 are turned on, and the electromagnet receives current and moves.

[0029] When the electromagnet does not need to move, the microcontroller sends a high-level drive signal to the input terminal INPUT. At this time, transistor Q1 is turned on, and optocoupler U1 is also turned on. Due to the conduction of the optocoupler, the voltage drop between the gate and emitter of IGBT Q2 is 0. At this time, the collector and emitter of IGBT Q2 are turned off, and the electromagnet cannot receive current and therefore does not move.

[0030] In this embodiment, the conduction speed of IGBT Q2 is controlled by adjusting resistor R4 and non-polar capacitor C2 to avoid the voltage spike generated at the moment IGBT Q2 is turned on, thereby protecting IGBT Q2 from being burned out by overvoltage.

[0031] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit for driving a DC electromagnet using an optocoupler and IGBT in an ATS, characterized in that, Including resistors R1, R2, R3, R4, R5, R6, R7, R8, optocoupler U1, non-polarized capacitor C1, non-polarized capacitor C2, diode D1, Zener diode D2, NPN transistor Q1, and IGBT Q2. One end of the resistor R1 is connected to the input terminal INPUT. The other end of the resistor R1, one end of the non-polarized capacitor C1, one end of the resistor R3, and the base of the NPN transistor Q1 are all connected together. The collector of the NPN transistor Q1 is connected to pin 2 of the optocoupler U1. Pin 1 of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to a +3.3V voltage. Pin 4 of the optocoupler U1 is connected to one end of resistor R4, and the other end of resistor R4, the cathode of diode D1, one end of non-polar capacitor C2, and the gate of IGBT Q2 are connected together; the collector of IGBT Q2 is connected to the TURN_DC- terminal. Pin 3 of the optocoupler U1, the positive terminal of the Zener diode D2, the other end of the non-polar capacitor C2, and the emitter of the IGBT Q2 are all connected to the DC- terminal. The other end of the non-polarized capacitor C1, the other end of the resistor R3, and the emitter of the NPN transistor Q1 are all grounded.

2. The ATS optocoupler and IGBT driving DC electromagnet actuation circuit according to claim 1, characterized in that, The negative terminal of the Zener diode D2 is connected to the positive terminal of the diode D1, and the resistor R5 is connected between the negative terminal of the Zener diode D2 and the positive terminal of the diode D1. The other end of resistor R5 is connected to resistors R6, R7, and R8 in sequence, and the other end of resistor R8 is connected to the DC+ terminal.

3. The ATS optocoupler and IGBT driving DC electromagnet actuation circuit according to claim 1, characterized in that, The input terminal INPUT receives high-level drive signals and low-level drive signals sent by the controller.

4. The ATS optocoupler and IGBT driving DC electromagnet operating circuit according to claim 1, characterized in that, The resistor R4, the non-polar capacitor C2, and the optocoupler U1 constitute a protection circuit.

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