Contactor control module and contactor

Abstract

The utility model provides a contactor control module and a contactor, and belongs to the technical field of contactor control, and the contactor control module comprises an energy storage circuit, an isolation control circuit, a drive circuit, a follow current control circuit and an energy absorption circuit. Wherein the energy storage circuit is charged according to the output of the power supply circuit; the isolation control circuit outputs a driving signal or a follow current signal according to the control signal. And then, the driving circuit controls connection or disconnection between the coil and the power supply circuit according to the driving signal, so that the contactor is closed. A follow current control circuit carries out follow current on the coil according to the follow current signal so as to maintain the closed state of the contactor. And finally, the energy absorption circuit is used for absorbing energy of induced electromotive force generated by power failure of the coil. Therefore, by absorbing the energy of the coil, the damage of the contactor caused by overhigh induced electromotive force is avoided, the current on the coil is quickly reduced, the magnetic field generated by the coil is declined, and the quick turn-off of the contactor is realized.

Description

Technical Field

[0001] The present application relates to the technical field of contactor control, and in particular to a contactor control module and a contactor. Background Art

[0002] Contactors use electromagnetic principles to rapidly close and open contacts, ensuring safe and reliable control of circuits. Contactors typically consist of an iron core, a coil, an armature, and a contact system. When power is applied to the coil, a magnetic field is generated around it, attracting the armature and causing the contact system to close or open.

[0003] When the coil is de-energized, a reverse induced electromotive force will be generated in the coil due to the effect of inductance. To avoid damage to other components in the circuit, a diode is usually connected in parallel on the coil side as a freewheeling circuit to consume the large voltage generated by the induced electromotive force.

[0004] However, by providing a freewheeling circuit, although the induced electromotive force on the coil can be consumed, the current on the coil decreases more slowly, thereby extending the breaking speed of the contactor. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present application provides a contactor control module and a contactor.

[0006] In a first aspect, the present application provides a contactor control module, comprising:

[0007] an energy storage circuit connected to the power supply circuit and configured to be charged according to the output of the power supply circuit;

[0008] an isolation control circuit, configured to receive a control signal and control the energy storage circuit to discharge according to the control signal, so as to output a drive signal or a freewheeling signal;

[0009] A drive circuit is connected in series with the coil in the contactor and is connected to the isolation control circuit, and is used to control the connection or disconnection between the coil and the power circuit according to the drive signal, so that the contactor is attracted by the magnetic field generated by the power supply of the coil;

[0010] a freewheeling control circuit connected in parallel with the coil and to the isolation control circuit, for forming a freewheeling loop according to the freewheeling signal to freewheel the coil when the drive circuit is disconnected;

[0011] The energy absorption circuit is connected in parallel with the driving circuit and is used to conduct according to the induced electromotive force generated by the coil to absorb the energy of the coil, so that the contactor is disconnected due to the decay of the magnetic field generated by the coil.

[0012] Optionally, the energy storage circuit includes a first energy storage sub-circuit and a second energy storage sub-circuit; the control signal includes a first control signal and a second control signal;

[0013] The isolation control circuit includes a first isolation sub-circuit and a second isolation sub-circuit connected in series with the power supply circuit;

[0014] The first isolation sub-circuit is connected to the first energy storage sub-circuit and the driving circuit, and is configured to receive the first control signal and, based on the first control signal, control the first energy storage sub-circuit to discharge so as to output the driving signal;

[0015] The second isolation subcircuit is connected to the second energy storage subcircuit and the freewheeling control circuit, and is configured to receive a second control signal and control the second energy storage subcircuit to discharge and output the freewheeling signal according to the second control signal.

[0016] Optionally, the first energy storage subcircuit includes a first voltage stabilizing diode and a first capacitor;

[0017] The first voltage stabilizing diode includes a cathode connected to the power supply circuit and the first isolation sub-circuit and an anode connected to the ground;

[0018] The first capacitor includes a first end connected to the cathode of the first Zener diode and a second end connected to the anode of the first Zener diode.

[0019] Optionally, the first isolation sub-circuit includes a first photocoupler;

[0020] The first photocoupler includes an anode connected to a voltage source, a cathode for receiving the first control signal, a collector connected to the first voltage stabilizing diode and the first capacitor, and an emitter connected to the driving circuit.

[0021] Optionally, the driving circuit includes a first switching tube;

[0022] The first switching tube includes a first electrode connected to the power circuit, a second electrode connected to the coil, and a control electrode connected to the emitter of the first photocoupler.

[0023] Optionally, the second energy storage subcircuit includes a second voltage stabilizing diode and a second capacitor;

[0024] The second voltage stabilizing diode includes a cathode connected to the drive circuit and an anode connected to the freewheeling control circuit and the second isolation sub-circuit;

[0025] The second capacitor includes a first end connected to the cathode of the second Zener diode and a second end connected to the anode of the second Zener diode.

[0026] Optionally, the second isolation subcircuit includes a second photocoupler, which includes a cathode for receiving the second control signal, an anode connected to the voltage source, a collector connected to the second energy storage subcircuit, and an emitter connected to the freewheeling control circuit.

[0027] Optionally, the freewheeling control circuit includes a second switching tube, which includes a first electrode connected to the first end of the coil, a second electrode connected to the second end of the coil, and a control electrode connected to the second isolation sub-circuit.

[0028] Optionally, the energy absorption circuit includes an energy absorption element, which is in a low-resistance state to absorb energy when the voltage difference between the two ends is greater than or equal to a threshold, and is in a high-resistance state when the voltage difference between the two ends is less than the threshold;

[0029] The energy absorption element includes a transient voltage suppressor; the transient voltage suppressor includes a first end connected to the power circuit and a second end connected to the coil.

[0030] In a second aspect, in one embodiment, the present application provides a contactor, including: the contactor control module as described above.

[0031] Through the above technical solution, this application has at least the following beneficial technical effects:

[0032] First, the energy storage circuit charges according to the output of the power circuit. The isolation control circuit discharges the energy storage circuit according to a control signal, outputting a drive signal or freewheeling signal. The drive circuit then controls the connection between the coil and the power circuit based on the drive signal, enabling or disabling the connection. This allows the magnetic field generated by energizing the coil to close the contactor when the contactor needs to be closed. Secondly, when the drive circuit is disconnected, the freewheeling control circuit forms a freewheeling loop based on the freewheeling signal, continuing the coil's current to maintain the contactor's closed state. Finally, an energy absorption circuit, connected in parallel with the drive circuit, conducts when the drive circuit disconnects the coil from the power circuit and absorbs the induced electromotive force (EMF) generated by the coil's de-energization. This prevents damage to the contactor due to excessively high induced electromotive force. Furthermore, by absorbing the coil's energy, the current in the coil decreases rapidly, causing the magnetic field generated by the coil to decay, thereby enabling rapid contactor closure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic diagram of a contactor control module in one embodiment of the present application;

[0035] Figure 2 This is a circuit connection diagram of a contactor control module in one embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of current flow during the charging process in one embodiment of the present application;

[0037] Figure 4 This is a current flow diagram of the control module during the contactor closing process in one embodiment of the present application;

[0038] Figure 5 This is a current flow diagram of the control module during the contactor holding process in one embodiment of the present application;

[0039] Figure 6 This is a current flow diagram of the control module during the contactor release process in one embodiment of the present application.

[0040] Explanation of the accompanying drawings: 1. Energy storage circuit; 11. First energy storage sub-circuit; 12. Second energy storage sub-circuit; 2. Isolation control circuit; 21. First isolation sub-circuit; 22. Second isolation sub-circuit; 3. Drive circuit; 4. Freewheeling control circuit; 5. Energy absorption circuit. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically qualified. In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is provided to enable anyone skilled in the art to implement and use the present application. In the following description, details are listed for illustrative purposes. It should be understood that one of ordinary skill in the art will recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0043] First, as Figure 1 As shown, in one embodiment, the present application provides a contactor control module, which includes an energy storage circuit 1, an isolation control circuit 2, a drive circuit 3, a freewheeling control circuit 4, and an energy absorption circuit 5. Among them, the energy storage circuit 1 is connected to the power supply circuit and is used to charge according to the output of the power supply circuit; the isolation control circuit 2 is used to receive a control signal and control the discharge of the energy storage circuit 1 according to the control signal to output a drive signal or a freewheeling signal; the drive circuit 3 is connected in series with the coil in the contactor and is connected to the isolation control circuit 2, and is used to control the conduction or disconnection between the coil and the power supply circuit according to the drive signal, so that the contactor is attracted by the magnetic field generated by the coil being energized; the freewheeling control circuit 4 is connected in parallel with the coil and is connected to the isolation control circuit 2, and is used to form a freewheeling loop according to the freewheeling signal to freewheel the coil when the drive circuit 3 is disconnected; the energy absorption circuit 5 is connected in parallel with the drive circuit 3, and is used to conduct according to the induced electromotive force generated by the coil to absorb the energy of the coil, so that the contactor is disconnected due to the decay of the magnetic field generated by the coil.

[0044] As an example, a power supply circuit may include a rectifier bridge and a filter capacitor. The input end of the rectifier bridge is connected to an AC voltage, the output end of the rectifier bridge is connected to the first end of the filter capacitor, and the second end of the filter capacitor is grounded. The rectifier bridge is composed of four diodes and can convert the negative and positive half-cycles of the AC voltage into positive DC signals. After smoothing and rectification by the filter capacitor, the DC voltage is output from the positive electrode of the power supply circuit. When the power supply circuit supplies power to the coil, the coil is connected in series between the positive electrode of the power supply circuit and the ground. The coil and the power supply circuit are set to a common ground. Therefore, when the coil generates an induced electromotive force, it will transfer the induced electromotive force to the power supply circuit, causing the DC voltage output from the positive electrode of the power supply circuit to increase.

[0045] As an example, combined with Figure 2 , Figure 2 J1 represents the coil. When the coil is energized, current flowing through it generates a magnetic field, which increases as the current increases, causing the contact system to close and the contactor to close. When the coil is de-energized, causing the current to gradually decrease, the magnetic field gradually decays until the magnetic force generated by the coil is too weak to keep the contact system closed. The contact system then opens, disconnecting the contactor.

[0046] In the above embodiment, first, the energy storage circuit 1 is charged according to the output of the power circuit; the isolation control circuit 2 controls the discharge of the energy storage circuit 1 according to the control signal to output a drive signal or a freewheeling signal. Then, the drive circuit 3 controls the connection or disconnection between the coil and the power circuit according to the drive signal, so that when the contactor needs to be closed, it can control the magnetic field generated by the coil energized to close the contactor. Secondly, when the drive circuit 3 is disconnected, the freewheeling control circuit 4 forms a freewheeling loop according to the freewheeling signal, which freewheels the coil to maintain the closed state of the contactor. Finally, the energy absorption circuit 5, connected in parallel with the drive circuit 3, is turned on when the drive circuit 3 controls the coil and the power circuit to disconnect, and absorbs the energy of the induced electromotive force generated by the coil being de-energized. On the one hand, this prevents damage to the contactor due to excessive induced electromotive force. On the other hand, by absorbing the energy of the coil, the current in the coil is rapidly reduced, causing the magnetic field generated by the coil to decay, thereby achieving rapid shutdown of the contactor.

[0047] As an embodiment of the energy storage circuit 1, the energy storage circuit 1 includes a first energy storage sub-circuit 11 and a second energy storage sub-circuit 12; the control signal includes a first control signal Drive1 and a second control signal Drive2; the isolation control circuit 2 includes a first isolation sub-circuit 21 and a second isolation sub-circuit 22 connected in series with the power supply circuit; the first isolation sub-circuit 21 is connected to the first energy storage sub-circuit 11 and the drive circuit 3, and is used to receive the first control signal Drive1, and control the first energy storage sub-circuit 11 to discharge and output a drive signal according to the first control signal Drive1; the second isolation sub-circuit 22 is connected to the second energy storage sub-circuit 12 and the freewheeling control circuit 4, and is used to receive the second control signal Drive2, and control the second energy storage sub-circuit 12 to discharge and output a freewheeling signal according to the second control signal Drive2.

[0048] As an example, the first control signal Drive1 can be output by the controller, which usually operates in a low-voltage environment. For example, the operating voltage of the controller can be 5V, and the drive circuit 3 needs to be directly connected in series between the coil and the power supply circuit, that is, the operating voltage of the drive circuit 3 is at the hundred-volt level. Therefore, the drive circuit 3 and the controller are isolated by the first isolation sub-circuit 21 to ensure safety.

[0049] In the above embodiment, the first energy storage sub-circuit 11 is first charged, and then the first control signal Drive1 from the low-voltage environment is transmitted to the high-voltage environment via the first isolation sub-circuit 21. The first control signal Drive1 controls the discharge of the first energy storage sub-circuit 11 to form a drive signal to control the contactor to close. Similarly, the second energy storage sub-circuit 12 is charged, and then the second control signal Drive2 from the low-voltage environment is transmitted to the high-voltage environment via the second isolation sub-circuit 22. The second control signal Drive2 controls the discharge of the second energy storage sub-circuit 12 to form a freewheeling signal to control the coil to continue current and maintain the contactor's closed state.

[0050] As an implementation manner of the first energy storage sub-circuit 11, the first energy storage sub-circuit 11 includes a first voltage-stabilizing diode ZD1 and a first capacitor C1; the first voltage-stabilizing diode ZD1 includes a cathode connected to the power supply circuit and the first isolation sub-circuit 21, and an anode connected to the ground; the first capacitor C1 includes a first end connected to the cathode of the first voltage-stabilizing diode ZD1 and a second end connected to the anode of the first voltage-stabilizing diode ZD1.

[0051] As an example, the first Zener diode ZD1 is under a reverse voltage, that is, the cathode voltage of the first Zener diode ZD1 is higher than the anode voltage. When the reverse voltage exceeds the breakdown voltage of the first Zener diode ZD1, the first Zener diode ZD1 enters a reverse breakdown state, so that the voltage across the first Zener diode ZD1 remains unchanged, thereby clamping the voltage across the first capacitor C1 connected in parallel with the first Zener diode ZD1 to limit the discharge voltage of the first capacitor C1.

[0052] In the above embodiment, the first capacitor C1 serves as an energy storage element. When the power circuit outputs a voltage, the first capacitor C1 is charged. The voltage across the first capacitor C1 is clamped by the first voltage regulator diode ZD1. The first isolation sub-circuit 21 controls the discharge of the first capacitor C1 according to the first control signal Drive1 to obtain a drive signal.

[0053] Reference Figure 2 As an implementation of the first isolation sub-circuit 21, the first isolation sub-circuit 21 includes a first photocoupler U1; the first photocoupler U1 includes an anode connected to a voltage source, a cathode for receiving the first control signal Drive1, a collector connected to the first voltage regulator diode ZD1 and the first capacitor C1, and an emitter connected to the drive circuit 3.

[0054] As an example, the voltage source connected to the anode of the first photocoupler U1 is a low-voltage voltage source, for example, the output of the voltage source may be a voltage with an amplitude of 5 V. For example, when the first control signal Drive1 output by the controller is at a low level, the anode potential of the first photocoupler U1 is greater than the cathode potential, the first photocoupler U1 is turned on, and because the first photocoupler U1 is connected to the first capacitor C1, when the first capacitor C1 is charged, the collector of the first photocoupler U1 is discharged, making the collector potential of the first photocoupler U1 greater than the emitter potential, thereby causing the emitter of the first photocoupler U1 to output a drive signal.

[0055] As an implementation of the driving circuit 3, the driving circuit 3 includes a first switching tube Q1; the first switching tube Q1 includes a first electrode connected to the power circuit, a second electrode connected to the coil, and a control electrode connected to the emitter of the first photocoupler U1.

[0056] As an example, taking the first switch tube Q1 as an N-type tube, when the control electrode of the first switch tube Q1 receives a high-level drive signal, the first switch tube Q1 is turned on, so that the power circuit provides current to the coil. When the control electrode of the first switch tube Q1 receives a low-level drive signal, the first switch tube Q1 is turned off, cutting off the current of the coil.

[0057] Reference Figure 2 As an implementation of the freewheeling control circuit 4, the freewheeling control circuit 4 includes a second switching tube Q2, the second switching tube Q2 includes a first electrode connected to the first end of the coil, a second electrode connected to the second end of the coil, and a control electrode connected to the second isolation sub-circuit 22.

[0058] In the above embodiment, by connecting the freewheeling control circuit 4 in parallel with the coil, the freewheeling control circuit 4 can form a freewheeling loop when the drive circuit 3 is disconnected, continuing to supply current to the coil. Thus, when the drive circuit 3 is not operating, the freewheeling control circuit 4 can maintain the current in the coil, allowing the drive circuit 3 to be turned on with a certain duty cycle rather than continuously, thereby reducing energy consumption.

[0059] Reference Figure 2 As an implementation of the second energy storage sub-circuit 12, the second energy storage sub-circuit 12 includes a second Zener diode ZD2 and a second capacitor C2; the second Zener diode ZD2 includes a cathode connected to the drive circuit 3 and an anode connected to the freewheeling control circuit 4 and the second isolation sub-circuit 22; the second capacitor C2 includes a first end connected to the cathode of the second Zener diode ZD2 and a second end connected to the anode of the second Zener diode ZD2.

[0060] As an implementation of the second isolation sub-circuit 22, the second isolation sub-circuit 22 includes a second photocoupler U2, which includes a cathode for receiving the second control signal Drive2, an anode connected to the voltage source, a collector connected to the second energy storage sub-circuit 12, and an emitter connected to the freewheeling control circuit 4.

[0061] As an example, the implementation principle between the second isolation sub-circuit 22, the second energy storage sub-circuit 12 and the freewheeling control circuit 4 is consistent with the implementation principle of the first energy storage sub-circuit 11, the first isolation sub-circuit 21 and the drive circuit 3, and will not be repeated here.

[0062] In the above embodiment, the second photocoupler U2 is turned on based on the second control signal Drive2 output by the controller, so that the second capacitor C2 starts to discharge to the second photocoupler U2, and the second capacitor C2 is clamped by the second voltage regulator diode ZD2, so that the emitter of the second photocoupler U2 outputs a freewheeling signal. The second switch tube Q2 is turned on after receiving the freewheeling signal to form a freewheeling loop connected in parallel at both ends of the coil, thereby realizing the freewheeling process of the coil through the self-circulation of the coil when there is no conduction between the coil and the power circuit.

[0063] As one embodiment of the energy absorption circuit 5, the energy absorption circuit 5 includes an energy absorption element. The energy absorption element assumes a low-resistance state to absorb energy when the voltage difference between the two ends is greater than or equal to a threshold, and assumes a high-resistance state when the voltage difference between the two ends is less than the threshold. As an example, the energy absorption element includes a transient voltage suppressor (TVS); the TVS includes a first end connected to the power circuit and a second end connected to the coil.

[0064] For example, when the reverse voltage of a TVS is less than its breakdown voltage, the TVS is in a high-resistance state, meaning it is disconnected. Compared to energy-absorbing components like capacitors and resistors, the TVS consumes no energy in the disconnected state and does not affect the flow of current in the coil. When the reverse voltage of the TVS reaches its breakdown voltage, the TVS changes from a high-resistance state to a low-resistance state. At this point, the TVS can instantly discharge the high voltage generated by the induced electromotive force to the ground, thereby absorbing the instantaneous high voltage. This prevents the induced electromotive force generated by the coil from damaging the contact system and rapidly consumes the current in the coil, causing the coil's magnetic field to decay rapidly.

[0065] It should be noted that the breakdown voltage of the transient voltage suppressor TVS varies depending on its model. A transient voltage suppressor TVS with an appropriate breakdown voltage can be selected based on the size of the induced electromotive force generated when the coil is powered off, so that the transient voltage suppressor TVS is disconnected when the coil is normally energized, and the transient voltage suppressor TVS is turned on when the coil is powered off and generates an induced electromotive force.

[0066] In the above embodiment, when the coil is de-energized, an induced electromotive force is generated. Since one end of the coil is connected to a common ground with the power supply circuit, the induced electromotive force generated by the coil is transmitted to the power supply circuit, causing the DC voltage output by the power supply voltage to increase. When the DC voltage increases to the breakdown voltage of the transient voltage suppressor TVS, the transient voltage suppressor TVS turns on to absorb the energy of the coil.

[0067] Reference Figure 2As a further embodiment of the contactor control module, the contactor control module further includes a first diode D1, a second diode D2, and a third diode D3. The first diode D1 includes a cathode connected to the first electrode of the second switching tube Q2 and an anode connected to the anode of the second voltage stabilizing diode ZD2 and the second end of the second capacitor C2, so as to prevent the current of the coil from flowing to the second capacitor C2 during the freewheeling process; the second diode D2 includes an anode connected to the first electrode of the second switching tube Q2 and a cathode connected to the coil, so as to prevent the current of the coil from flowing in the reverse direction during the freewheeling process; the third diode D3 includes a cathode connected to the first end of the second capacitor C2 and an anode connected to the second end of the first capacitor C1, so as to prevent the second capacitor C2 from discharging into the first capacitor C1.

[0068] Reference Figures 3 to 6 , this application exemplarily describes the working process of the contactor control module.

[0069] Figure 3 This diagram illustrates the current flow after the power supply circuit is powered on. When the power supply circuit begins outputting a DC voltage, the DC voltage charges the first capacitor C1 through the first Zener diode ZD1 and the second capacitor C2 through the second Zener diode ZD2. The DC voltage then flows through the body diode of the second switch Q2 to the ground of the power supply circuit, forming a closed loop.

[0070] Figure 4 This diagram illustrates the current flow during the contactor closing process. The controller outputs a first control signal, Drive1, to turn on the first optocoupler U1. The first capacitor C1 discharges through the first optocoupler U1 to the first switch Q1, effectively outputting a drive signal to the first switch Q1 to turn it on. At this point, the DC voltage output by the power supply circuit flows through the first switch Q1, through the coil, and back to the power supply circuit ground, forming a closed loop. This energizes the coil, creating a magnetic field that closes the contact system and closes the contactor.

[0071] After the contactor is closed, it enters the holding process. Figure 5The current flow during the contactor holding process is illustrated. The controller outputs a first control signal Drive1 to control the first photocoupler U1 to disconnect, thereby disconnecting the first switch Q1. At this time, the controller outputs a second control signal Drive2 to control the second photocoupler U2 to turn on. The second capacitor C2 discharges to the second switch Q2 through the second photocoupler U2, that is, a freewheeling signal is output to the second switch Q2 to control the second switch Q2 to turn on. At this time, the current on the coil is output from the first end of the coil and returns to the second end of the coil through the second switch Q2 to form a freewheeling loop to continue the current in the coil. Subsequently, the first switch Q1 is controlled to turn on so that the power circuit provides current to the coil. In this way, the first control signal Drive1 is repeatedly switched between a high level state and a low level state, causing the first switch Q1 to repeatedly disconnect and turn on, so that the current of the coil is continuously switched between being provided by the power circuit or the freewheeling loop, so that there is a continuous current in the coil, so that the contactor operates in a holding state.

[0072] Combine Figure 6 , Figure 6 This diagram illustrates the current flow during the contactor release process. When the first and second switches Q1 and Q2 are disconnected, the coil loses continuous current to generate an induced electromotive force. This induced electromotive force enters the power circuit through the ground, increasing the DC voltage output by the power circuit. This DC voltage is then transmitted to the transient voltage suppressor (TVS), which absorbs the induced electromotive force, rapidly reducing the current in the coil and simultaneously decaying the magnetic field generated by the coil, thus completing the contactor's rapid release process.

[0073] In a second aspect, in one embodiment, the present application provides a contactor, including: the contactor control module as described above.

[0074] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0076] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A contactor control module, characterized in that: include: an energy storage circuit connected to the power supply circuit and configured to be charged according to the output of the power supply circuit; an isolation control circuit, configured to receive a control signal and control the energy storage circuit to discharge according to the control signal, so as to output a drive signal or a freewheeling signal; A drive circuit is connected in series with the coil in the contactor and is connected to the isolation control circuit, and is used to control the connection or disconnection between the coil and the power circuit according to the drive signal, so that the contactor is attracted by the magnetic field generated by the power supply of the coil; a freewheeling control circuit connected in parallel with the coil and to the isolation control circuit, for forming a freewheeling loop according to the freewheeling signal to freewheel the coil when the drive circuit is disconnected; The energy absorption circuit is connected in parallel with the driving circuit and is used to conduct according to the induced electromotive force generated by the coil to absorb the energy of the coil, so that the contactor is disconnected due to the decay of the magnetic field generated by the coil.

2. The contactor control module according to claim 1, characterized in that: The energy storage circuit includes a first energy storage sub-circuit and a second energy storage sub-circuit; the control signal includes a first control signal and a second control signal; The isolation control circuit includes a first isolation sub-circuit and a second isolation sub-circuit connected in series with the power supply circuit; The first isolation sub-circuit is connected to the first energy storage sub-circuit and the driving circuit, and is configured to receive the first control signal and, based on the first control signal, control the first energy storage sub-circuit to discharge so as to output the driving signal; The second isolation subcircuit is connected to the second energy storage subcircuit and the freewheeling control circuit, and is configured to receive a second control signal and control the second energy storage subcircuit to discharge and output the freewheeling signal according to the second control signal.

3. The contactor control module according to claim 2, characterized in that: The first energy storage subcircuit includes a first voltage stabilizing diode and a first capacitor; The first voltage stabilizing diode includes a cathode connected to the power supply circuit and the first isolation sub-circuit and an anode connected to the ground; The first capacitor includes a first end connected to the cathode of the first Zener diode and a second end connected to the anode of the first Zener diode.

4. The contactor control module according to claim 3, characterized in that: The first isolation subcircuit includes a first optocoupler; The first photocoupler includes an anode connected to a voltage source, a cathode for receiving the first control signal, a collector connected to the first voltage stabilizing diode and the first capacitor, and an emitter connected to the driving circuit.

5. The contactor control module according to claim 4, characterized in that: The driving circuit includes a first switching tube; The first switching tube includes a first electrode connected to the power circuit, a second electrode connected to the coil, and a control electrode connected to the emitter of the first photocoupler.

6. The contactor control module according to claim 2, characterized in that: The second energy storage subcircuit includes a second voltage stabilizing diode and a second capacitor; The second voltage stabilizing diode includes a cathode connected to the drive circuit and an anode connected to the freewheeling control circuit and the second isolation sub-circuit; The second capacitor includes a first end connected to the cathode of the second Zener diode and a second end connected to the anode of the second Zener diode.

7. The contactor control module according to claim 2, characterized in that: The second isolation subcircuit includes a second photoelectric coupler, which includes a cathode for receiving the second control signal, an anode connected to a voltage source, a collector connected to the second energy storage subcircuit, and an emitter connected to the freewheeling control circuit.

8. The contactor control module according to claim 2, characterized in that: The freewheeling control circuit includes a second switching tube, which includes a first electrode connected to the first end of the coil, a second electrode connected to the second end of the coil, and a control electrode connected to the second isolation sub-circuit.

9. The contactor control module according to claim 1, characterized in that: The energy absorption circuit includes an energy absorption element, which is in a low-resistance state to absorb energy when the voltage difference between the two ends is greater than or equal to a threshold, and in a high-resistance state when the voltage difference between the two ends is less than the threshold; The energy absorption element includes a transient voltage suppressor; the transient voltage suppressor includes a first end connected to the power circuit and a second end connected to the coil.

10. A contactor, characterized in that: include: A contactor control module according to any one of claims 1 to 9.

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