Contactor control circuit and contactor system

Abstract

The utility model provides a contactor control circuit and a contactor system, the contactor control circuit comprises a control circuit, a contactor drive circuit and a mode indication circuit, and the control circuit comprises a first mode control module and a second mode control module; the first input end of the first mode control module and the first input end of the second mode control module are electrically connected with the output end of the mode indicating circuit, and the output end of the first mode control module and the output end of the second mode control module are electrically connected with the input end of the contactor driving circuit. The output end of the contactor driving end is electrically connected with the contactor; and the first mode control module and the second mode control module are respectively used for controlling the contactor through the contactor driving circuit according to the mode indication signal output by the mode indication circuit. The working modes of the control circuit of the contactor are enriched, and the application scene range is expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a control circuit of a contactor and a contactor system. Background Art

[0002] A contactor is an electrical component used to control circuits, typically high-power loads. They open or close circuits based on changes in an input signal. A contactor typically consists of a contactor coil and a set of contacts that switch the circuit. When the contactor coil is energized, it generates a magnetic field, closing the contacts. When the contactor coil is de-energized, the contacts open, breaking the circuit. Contactors are typically controlled by their corresponding contactor control circuit.

[0003] However, the control circuit of the traditional contactor can only realize a single working mode, which has limitations in use. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a control circuit for a contactor and a contactor system.

[0005] In a first aspect, in one embodiment, the utility model provides a control circuit for a contactor, the control circuit for the contactor comprising a control circuit, a contactor drive circuit, and a mode indication circuit, the control circuit comprising a first mode control module and a second mode control module;

[0006] The first input end of the first mode control module and the first input end of the second mode control module are respectively electrically connected to the output end of the mode indication circuit, the output end of the first mode control module and the output end of the second mode control module are respectively electrically connected to the input end of the contactor drive circuit, and the output end of the contactor drive end is used to be electrically connected to the contactor;

[0007] The first mode control module and the second mode control module are respectively used to control the contactor through the contactor driving circuit according to the mode indication signal output by the mode indication circuit.

[0008] In one embodiment, the mode indication circuit includes a switch;

[0009] The switch is used to output a low level representing the first mode and a high level representing the second mode, or to output a high level representing the first mode and a low level representing the second mode.

[0010] In one embodiment, the control circuit of the contactor further includes a status indication circuit;

[0011] The output end of the state indication circuit is electrically connected to the second input end of the first mode control module and the second input end of the second mode control module;

[0012] The first mode control module and the second mode control module are further respectively used to control the contactor through the contactor drive circuit according to the status indication signal output by the status indication circuit.

[0013] In one embodiment, the status indication circuit includes a voltage reduction circuit and an isolation circuit;

[0014] The input end of the step-down circuit is used to access the host computer voltage, the output end of the step-down circuit is electrically connected to the input end of the isolation circuit, and the output end of the isolation circuit is electrically connected to the second input end of the first mode control module and the second input end of the second mode control module.

[0015] In one embodiment, the control circuit of the contactor further includes a pressure module;

[0016] The output end of the pressure module is electrically connected to the first input end of the first mode control module and the first input end of the second mode control module, and is used to collect the pressure of the contactor and feed back the corresponding pressure signal to the first mode control module and the second mode control module;

[0017] The first mode control module and the second mode control module are further configured to control the contactor through the contactor drive circuit according to the pressure signal.

[0018] In one embodiment, the control circuit of the contactor further includes a temperature measurement module;

[0019] The output end of the temperature measurement module is electrically connected to the first input end of the first mode control module and the first input end of the second mode control module, and is used to collect the temperature of the contactor and feed back a corresponding temperature signal to the first mode control module and the second mode control module;

[0020] The first mode control module and the second mode control module are further configured to control the contactor through the contactor drive circuit according to the temperature signal.

[0021] In one embodiment, the contactor drive circuit includes a power device and a freewheeling circuit;

[0022] The input end of the power device is electrically connected to the first output end of the first mode control module and the first output end of the second mode control module, the input end of the freewheeling loop is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module, and the output end of the power device and the output end of the freewheeling loop are electrically connected to the contactor respectively;

[0023] The power device is used to control the on / off state of the contactor under the control of the first mode control module or the second mode control module;

[0024] The freewheeling circuit is used to control the freewheeling state of the contactor under the control of the first mode control module or the second mode control module.

[0025] In one embodiment, the freewheeling circuit includes a freewheeling diode, a MOS transistor, a voltage regulator diode and a switch device;

[0026] The cathode of the freewheeling diode, the cathode of the voltage-stabilizing diode, the first access terminal of the switching device, and the gate of the MOS transistor are respectively used to be electrically connected to the input terminal of the coil in the contactor, the anode of the freewheeling diode is electrically connected to the source of the MOS transistor, the anode of the voltage-stabilizing diode, and the second access terminal of the switching device, the drain of the MOS transistor is used to be electrically connected to the output terminal of the coil, and the controlled terminal of the switching device is electrically connected to the second output terminal of the first mode control module and the second output terminal of the second mode control module.

[0027] In one embodiment, the switching device comprises an optocoupler;

[0028] The anode of the light-emitting diode in the optocoupler is connected to the working voltage, and the cathode of the light-emitting diode in the optocoupler is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module; the collector of the phototransistor in the optocoupler is electrically connected to the cathode of the freewheeling diode, the cathode of the voltage-stabilizing diode and the gate of the MOS tube, and the emitter of the phototransistor in the optocoupler is electrically connected to the anode of the freewheeling diode, the source of the MOS tube and the anode of the voltage-stabilizing diode.

[0029] In a second aspect, in one embodiment, the present invention provides a contactor system, which includes a contactor and a control circuit of the contactor in any one of the above embodiments.

[0030] Through the control circuit and contactor system of the above-mentioned contactor, a first mode control module and a second mode control module are opened in the control circuit, and combined with a mode indication circuit, so that the first mode control module and the second mode control module can execute the first mode or the second mode according to the connected mode indication signal, thereby enriching the working mode of the control circuit of the contactor and expanding the scope of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a schematic diagram of the structure of the control circuit of the contactor in one embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of a specific circuit implementation of a control circuit of a contactor in one embodiment of the present utility model;

[0034] Figure 3 This is a schematic structural diagram of a control circuit of a contactor including a status indication circuit in one embodiment of the present invention;

[0035] Figure 4 The figure is a schematic diagram of a specific circuit implementation of a freewheeling circuit in one embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "multiple" means two or more, unless otherwise expressly specified. In the present application, the word "exemplary" is used to mean "serving as an example, illustration, or explanation." Any embodiment described in the present application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. 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 invention can be implemented without using these specific details. In other examples, well-known structures and processes are not described in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0038] First, as Figure 1 As shown, in one embodiment, the utility model provides a control circuit of a contactor, the control circuit of the contactor includes a control circuit, a contactor drive circuit and a mode indication circuit, and the control circuit includes a first mode control module and a second mode control module.

[0039] Among them, the first mode control module and the second mode control module can be two independent modules or the same module. For example, the control circuit can execute the control function of the local mode and the control function of the remote mode. When it executes the control function of the local mode, it acts as the first mode control module, and when it executes the control function of the remote mode, it acts as the second mode control module.

[0040] The first input end of the first mode control module and the first input end of the second mode control module are respectively electrically connected to the output end of the mode indication circuit, the output end of the first mode control module and the output end of the second mode control module are respectively electrically connected to the input end of the contactor drive circuit, and the output end of the contactor drive end is used to be electrically connected to the contactor.

[0041] Among them, although in this embodiment and Figure 1 In the embodiment, the first mode control module and the second mode control module in the control circuit respectively have corresponding input terminals. However, when the first mode control module and the second mode control module are the same module, when the control circuit performs the control function of the local mode, the input terminal electrically connected to the control circuit and the mode indication circuit can be understood as the first input terminal of the first mode control module. When the control circuit performs the control function of the remote mode, the input terminal electrically connected to the control circuit and the mode indication circuit can be understood as the first input terminal of the second mode control module.

[0042] In summary, although this embodiment distinguishes the first mode control module from the second mode control module in terms of technical content, it does not limit the two to being two independent modules.

[0043] The first mode control module and the second mode control module are respectively used to control the contactor through the contactor driving circuit according to the mode indication signal output by the mode indication circuit.

[0044] Among them, the first mode and the second mode can be defined according to actual needs. For example, in this embodiment, the first mode may refer to the local mode, which specifically refers to working immediately after the control circuit of the contactor is powered on; the second mode may refer to the remote mode, which specifically refers to working only after the control circuit of the contactor is powered on and a working instruction sent from the remote end is received.

[0045] Through the control circuit of the above-mentioned contactor, a first mode control module and a second mode control module are opened in the control circuit, and combined with a mode indication circuit, so that the first mode control module and the second mode control module can execute the local mode or the remote mode according to the connected mode indication signal, thereby enriching the working mode of the control circuit of the contactor and expanding the scope of application scenarios.

[0046] In order to make the technical solutions of each embodiment more concise, in some subsequent embodiments, the first mode control module and the second mode control module are described as the same module, that is, the control circuit executes the first mode and the second mode respectively.

[0047] like Figure 2 As shown, in one embodiment, the mode indication circuit includes a switch.

[0048] Wherein, the control circuit includes a microcontroller.

[0049] The switch is used to output a low level representing the first mode and a high level representing the second mode, or to output a high level representing the first mode and a low level representing the second mode.

[0050] When the microcontroller receives the level signal input by the switch, it can determine the current working mode according to the preset corresponding relationship.

[0051] like Figure 3 As shown, in one embodiment, the control circuit of the contactor further includes a status indication circuit.

[0052] exist Figure 3 In the embodiment, the output end of the state indicating circuit is electrically connected to the second input end of the first mode control module and the second input end of the second mode control module.

[0053] The first mode control module and the second mode control module are further configured to control the contactor through the contactor drive circuit according to the status indication signal output by the status indication circuit.

[0054] The contactor's control circuit is only a small part of the electrical system in which it is located. Therefore, to ensure higher controllability of the contactor's control circuit, a status indication circuit can be used to feedback a corresponding status indication signal to the control circuit based on the signal sent by the host computer. If the host computer determines that the contactor is currently operational, the status indication circuit sends a status indication signal indicating the working state to the control circuit. If the host computer determines that the contactor is currently inoperable, the status indication circuit sends a status indication signal indicating the stopped state to the control circuit.

[0055] like Figure 2As shown, in one embodiment, the status indication circuit includes a voltage reduction circuit 2 and an isolation circuit 2 .

[0056] exist Figure 2 In the figure, the input end of the step-down circuit 2 is used to access the host computer voltage (when the host computer is a PLC, the corresponding host computer voltage is the PLC input voltage), the output end of the step-down circuit 2 is electrically connected to the input end of the isolation circuit 2, and the output end of the isolation circuit 2 is electrically connected to the microcontroller.

[0057] The voltage directly transmitted from the PLC may have a large amplitude, so it needs to be stepped down by the step-down circuit 2 to meet the access requirements of the microcontroller. In addition, since the PLC is in a relatively high-voltage environment and the microcontroller is in a relatively low-voltage environment, and interference is easily generated between the high and low voltage environments, in this embodiment, a corresponding isolation circuit 2 is also provided to achieve electrical isolation and improve circuit reliability.

[0058] like Figure 2 As shown, in one embodiment, the control circuit of the contactor further includes a pressure module.

[0059] exist Figure 2 In the embodiment, the output end of the pressure module is electrically connected to the first input end of the microcontroller, and is used to collect the pressure of the contactor and feed back the corresponding pressure signal to the microcontroller.

[0060] The microcontroller is also used to control the contactor through the contactor drive circuit according to the pressure signal.

[0061] Specifically, the pressure module can be set inside the body of the contactor and can collect the current altitude position of the contactor. Because the electromagnetic force generated by the coil system at different altitudes under the action of the same current is different, generally the higher the altitude, the smaller the electromagnetic force generated. Therefore, the altitude information collected by the pressure module is transmitted to the microcontroller. The microcontroller can substitute the built-in algorithm according to the current position and dynamically adjust the output drive signal, so that the contact mechanism can work reliably at different positions.

[0062] like Figure 2 As shown, in one embodiment, the control circuit of the contactor further includes a temperature measurement module.

[0063] exist Figure 2 In the embodiment, the output terminal of the temperature measuring module is electrically connected to the second input terminal of the microcontroller, and is used to collect the temperature of the contactor and feed back a corresponding temperature signal to the microcontroller.

[0064] The microcontroller is also used to control the contactor through the contactor drive circuit according to the temperature signal.

[0065] Specifically, the temperature measurement module can be set inside the body of the contactor, and can measure the real-time temperatures K1 and K2 of the contact mechanism and the coil system respectively. The temperature measurement module can convert the measured temperature into voltage signals VK1 and VK2. The converted voltage signals VK1 and VK2 are collected by the comparator of the microcontroller and compared with the preset voltage threshold VK. When the threshold is exceeded, the output drive signal can be stopped in time to shut down the coil system.

[0066] like Figure 2 As shown, in one embodiment, the contactor drive circuit includes a drive circuit, a power device and a freewheeling loop.

[0067] exist Figure 2 In the embodiment, the input end of the power device is electrically connected to the first output end of the microcontroller through the drive circuit, the input end of the freewheeling loop is electrically connected to the second output end of the microcontroller, and the output end of the power device and the output end of the freewheeling loop are electrically connected to the coil system in the contactor respectively.

[0068] The power device is used to control the on and off state of the contactor under the control of the microcontroller.

[0069] Among them, the power device can be a MOS tube, which is connected in series between the coil system and the ground. When the MOS tube is turned on, the loop from the coil system to the ground is turned on, the coil system generates current to drive the contact mechanism to close, and the contactor is turned on.

[0070] The freewheeling circuit is used to control the freewheeling state of the contactor under the control of the microcontroller.

[0071] After power is removed from the coil system, since it still stores energy, it needs to be freewheeled to reduce safety risks. However, during this process, current still flows through the coil system, causing the contact mechanism to remain closed. Therefore, to increase the shutdown speed, the freewheeling circuit in this embodiment can be used to control the freewheeling duration, thereby ending the freewheeling in a shorter time.

[0072] like Figure 4 As shown, in one embodiment, the freewheeling circuit includes a freewheeling diode D10, a MOS transistor Q1, a voltage regulator diode ZD1 and a switching device (such as an optocoupler U8).

[0073] exist Figure 4In the embodiment, the cathode of the freewheeling diode D10, the cathode of the voltage-stabilizing diode ZD1, the collector of the phototransistor in the optocoupler U8, and the gate of the MOS transistor Q1 are respectively used to be electrically connected to the input end of the coil in the contactor to access the working voltage V_B; the anode of the freewheeling diode D10 is electrically connected to the source of the MOS transistor Q1, the anode of the voltage-stabilizing diode ZD1, and the emitter of the phototransistor in the optocoupler U8, the drain of the MOS transistor Q1 is used to be electrically connected to the output end of the coil, the anode of the light-emitting diode in the optocoupler U8 is connected to the working voltage (such as a working voltage of +3.3), and the cathode of the light-emitting diode in the optocoupler U8 is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module to access the control signal En_Ctrl.

[0074] When the control signal En_Ctrl connected to the optocoupler U8 is at a high level, the optocoupler U8 is turned off. At this time, due to the presence of the voltage regulator diode ZD1, the gate-source voltage of the MOS transistor Q1 meets the conduction requirement and is turned on, allowing the coil to discharge the freewheeling current through the MOS transistor Q1 and the freewheeling diode D10. When the control signal En_Ctrl connected to the optocoupler U8 is at a low level, the optocoupler U8 is turned on, and the voltage regulator diode ZD1 is short-circuited, causing the gate-source voltage of the MOS transistor Q1 to fail to meet the conduction requirement and be turned off. The coil cannot discharge the freewheeling current through the MOS transistor Q1 and the freewheeling diode D10.

[0075] like Figure 2 As shown, the control input voltage is field controlled. This voltage has two branches. The first branch includes the EMC circuit, power supply circuit, step-down circuit, etc., and the signal enters the microprocessor. The second branch includes the voltage sampling circuit, isolation circuit, etc., and the signal also enters the microprocessor. The microprocessor outputs the signal to the drive circuit to drive the power device and the coil system to work. The coil system generates current to make the contact mechanism work, so that the three phases A, B, and C are turned on.

[0076] Among them, the control input voltage can be AC ​​or DC, and the input voltage UC has two branches, one of which is the voltage sampling branch. The input voltage UC is often very high and usually cannot be directly processed by the microcontroller. It needs to be sampled and processed. Since the voltage is input from the outside, an isolation circuit 1 is required to isolate the interference that may be introduced from the outside. The voltage sampling circuit outputs USAM, USAM = A*UC (A can be adjusted according to actual needs). USAM outputs USAM-ISO through the isolation circuit 1, and the signal enters the ADC module of the microcontroller. The microcontroller calculates the current input voltage UC based on the discrete value UC-ADC obtained by sampling.

[0077] Among them, the second branch of the input voltage UC is the power supply branch. Because external EMI interference may cause product abnormalities, and product operation may also cause EMS interference and pollute the power grid, the input voltage UC first passes through the EMC circuit to output UP. UP has two branches, one to provide energy for the coil system, and the other to step down the voltage output UL through the power circuit. UL can power the drive circuit and signal conditioning circuit. At the same time, UL obtains a stable DC voltage UM through the step-down circuit 1, and UM powers the microcontroller.

[0078] Among them, when the contact mechanism is working, the main circuit is turned on, and the main circuit sampling circuit can sample the main circuit current to obtain three-phase voltage signals UIA, UIB, and UIC. The three-phase voltage signal is output K times UIA, UIB, and UIC through the signal conditioning circuit. After the signal is superimposed on the reference voltage, it is collected and calculated by the ADC module of the microcontroller. The CPU inside the microcontroller calculates the current main circuit current value, and relevant current protection, metering, etc. can be performed through relevant algorithms.

[0079] Among them, the communication module can output various information of the current product to the outside world and can also execute various external instructions.

[0080] In a second aspect, in one embodiment, the present invention provides a contactor system, which includes a contactor and a control circuit of the contactor in any one of the above embodiments.

[0081] Through the above-mentioned contactor system, a first mode control module and a second mode control module are opened in the control circuit, and combined with a mode indication circuit, so that the first mode control module and the second mode control module can execute the first mode or the second mode according to the connected mode indication signal, ultimately enriching the working mode of the control circuit of the contactor and expanding the scope of application scenarios.

[0082] 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, please refer to the detailed description of other embodiments above and will not be repeated here.

[0083] The above describes in detail a contactor drive circuit, a contactor control circuit, and a contactor system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

[0084] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A control circuit for a contactor, characterized in that: The control circuit of the contactor includes a control circuit, a contactor drive circuit and a mode indication circuit, and the control circuit includes a first mode control module and a second mode control module; The first input end of the first mode control module and the first input end of the second mode control module are respectively electrically connected to the output end of the mode indication circuit, the output end of the first mode control module and the output end of the second mode control module are respectively electrically connected to the input end of the contactor drive circuit, and the output end of the contactor drive end is used to be electrically connected to the contactor; The first mode control module and the second mode control module are respectively configured to control the contactor through the contactor drive circuit according to the mode indication signal output by the mode indication circuit.

2. The control circuit of the contactor according to claim 1, characterized in that: The mode indication circuit includes a switch; The switch is used to output a low level representing the first mode and a high level representing the second mode, or to output a high level representing the first mode and a low level representing the second mode.

3. The control circuit of the contactor according to claim 1 or 2, characterized in that: The control circuit of the contactor also includes a status indication circuit; The output end of the state indication circuit is electrically connected to the second input end of the first mode control module and the second input end of the second mode control module; The first mode control module and the second mode control module are further respectively configured to control the contactor through the contactor drive circuit according to the status indication signal output by the status indication circuit.

4. The control circuit of the contactor according to claim 3, characterized in that: The state indication circuit includes a step-down circuit and an isolation circuit; The input end of the step-down circuit is used to access the host computer voltage, the output end of the step-down circuit is electrically connected to the input end of the isolation circuit, and the output end of the isolation circuit is electrically connected to the second input end of the first mode control module and the second input end of the second mode control module.

5. The control circuit of the contactor according to claim 1 or 2, characterized in that: The control circuit of the contactor further includes a pressure module; The output end of the pressure module is electrically connected to the first input end of the first mode control module and the first input end of the second mode control module, and is used to collect the pressure of the contactor and feed back corresponding pressure signals to the first mode control module and the second mode control module; The first mode control module and the second mode control module are further respectively configured to control the contactor through the contactor drive circuit according to the pressure signal.

6. The control circuit of the contactor according to claim 1 or 2, characterized in that: The control circuit of the contactor also includes a temperature measurement module; The output end of the temperature measurement module is electrically connected to the first input end of the first mode control module and the first input end of the second mode control module, and is used to collect the temperature of the contactor and feed back a corresponding temperature signal to the first mode control module and the second mode control module; The first mode control module and the second mode control module are further respectively configured to control the contactor through the contactor drive circuit according to the temperature signal.

7. The control circuit of the contactor according to claim 1 or 2, characterized in that: The contactor drive circuit includes a power device and a freewheeling circuit; The input end of the power device is electrically connected to the first output end of the first mode control module and the first output end of the second mode control module, the input end of the freewheeling circuit is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module, and the output end of the power device and the output end of the freewheeling circuit are electrically connected to the contactor respectively; The power device is used to control the on / off state of the contactor under the control of the first mode control module or the second mode control module; The freewheeling circuit is used to control the freewheeling state of the contactor under the control of the first mode control module or the second mode control module.

8. The control circuit of the contactor according to claim 7, characterized in that: The freewheeling circuit includes a freewheeling diode, a MOS tube, a voltage regulator diode and a switch device; The cathode of the freewheeling diode, the cathode of the voltage regulator diode, the first access end of the switching device and the gate of the MOS transistor are respectively used to be electrically connected to the input end of the coil in the contactor, the anode of the freewheeling diode is electrically connected to the source of the MOS transistor, the anode of the voltage regulator diode and the second access end of the switching device, the drain of the MOS transistor is used to be electrically connected to the output end of the coil, and the controlled end of the switching device is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module.

9. The control circuit of the contactor according to claim 8, characterized in that: The switching device includes an optocoupler; The anode of the light-emitting diode in the optocoupler is connected to the working voltage, and the cathode of the light-emitting diode in the optocoupler is electrically connected to the second output end of the first mode control module and the second output end of the second mode control module; the collector of the phototransistor in the optocoupler is electrically connected to the cathode of the freewheeling diode, the cathode of the voltage-stabilizing diode and the gate of the MOS tube, and the emitter of the phototransistor in the optocoupler is electrically connected to the anode of the freewheeling diode, the source of the MOS tube and the anode of the voltage-stabilizing diode.

10. A contactor system, characterized in that: The contactor system comprises a contactor and a control circuit of the contactor according to any one of claims 1 to 9.

Images