Overvoltage suppressor for contactor and working method

Abstract

The invention relates to the technical field of low-voltage electric appliances, in particular to an overvoltage suppressor for a contactor and a working method, and can solve the problem that the stability of an existing overvoltage suppressor applied to the contactor still needs to be improved to a certain extent. The overvoltage suppressor for the contactor comprises a first resistor, a light-emitting diode, a surge absorption diode, a second resistor, a diode, a protective shell and a printed board assembly, and the first resistor, the second resistor, the diode, the light-emitting diode and the surge absorption diode are all fixedly arranged on the printed board assembly. The printed board assembly is arranged in the protective shell and is connected with the contactor coil in parallel, after the coil controls voltage to be powered off, the printed board assembly can absorb reverse electromotive force generated by the coil, meanwhile, a light-emitting diode indicates the action state, the contactor coil is protected, and the reliability of the contactor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to an overvoltage suppressor for a contactor and a working method thereof. Background Art

[0002] The contactor is a widely used switching device, which mainly controls the connection and disconnection of the load circuit where the contactor is located by controlling the closing and separation of the moving contact and the static contact. The normal operation of the contactor is closely related to the contactor's closing stability. The distance between the moving contact and the static contact in the separated state will have a significant impact on the contactor's closing stability. The overvoltage suppressor is used in the contactor control circuit as a component of the contactor and is connected in parallel with the contactor electromagnetic coil. It can absorb the reverse electromotive force generated when the coil is powered off, and the light-emitting diode displays the state of absorbing the reverse electromotive force.

[0003] The existing overvoltage suppressor structure is to design a variable impedance material into the component structure, and electrically connect the signal conductive electrode (signal electrode) and the ground conductive electrode (ground electrode) through the variable impedance material. When the overvoltage suppressor is within the normal operating voltage range, the variable impedance material is in a high impedance state. At this time, the voltage and current on the signal conductive electrode will not be introduced into the ground conductive electrode. However, when an abnormal overvoltage surge occurs on the signal conductive electrode, the characteristic of the variable impedance material will be transformed into a low impedance state. At this time, the surge energy will be introduced from the signal conductive electrode through the variable impedance material to the ground conductive electrode and discharged into the ground terminal (ground). Therefore, by using the characteristics of the variable impedance material, the voltage on the signal conductive electrode can be maintained within a range that will not damage the circuit, thereby achieving the purpose of protecting the circuit.

[0004] However, the stability of the existing overvoltage suppressors used in contactors still needs to be improved. Summary of the invention

[0005] In order to solve the problem that the stability of the existing overvoltage suppressor used in contactors still needs to be improved, the present application provides an overvoltage suppressor for a contactor and a working method.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect, the present application provides an overvoltage suppressor for a contactor, comprising a first resistor, a light emitting diode, a surge absorption diode, a second resistor, a diode, a protective shell and a printed circuit board assembly;

[0008] The first resistor, the second resistor, the diode, the light emitting diode and the surge absorption diode are all fixedly arranged on the printed circuit board assembly;

[0009] The printed circuit board assembly is arranged in the protective shell.

[0010] In a possible implementation manner, the diode is connected in series with the surge absorption diode and the second resistor.

[0011] In a possible implementation manner, the light emitting diode is connected in series with the first resistor, and is connected in parallel with the surge absorption diode.

[0012] In a possible implementation, the negative end of the diode is connected to the positive electrode of the DC control power supply, and one end of the second resistor is connected to the negative electrode of the DC control power supply.

[0013] In a possible implementation, a fastener is installed in the protective shell, and the printed circuit board assembly is fixed in the protective shell through the fastener.

[0014] In a possible implementation, an insulating plate is further provided at the bottom of the protective shell, and the protective shell is sealed and insulated by the insulating plate.

[0015] In a possible implementation, the fasteners are two fastening bolts and screw holes.

[0016] In a second aspect, the present application provides a working method of an overvoltage suppressor for a contactor, which absorbs the reverse electromotive force generated by the contactor coil after the contactor coil control power supply voltage is cut off, and at the same time, the light emitting diode indicates the action status to protect the contactor coil.

[0017] The technical solution provided by this application can at least achieve the following beneficial effects:

[0018] The overvoltage suppressor for contactors and the working method provided in the present application are connected in parallel with the contactor coil. After the coil control voltage is powered off, the reverse electromotive force generated by the coil can be absorbed. At the same time, a light-emitting diode indicates the operating state, thereby protecting the contactor coil and improving the reliability of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of the electrical principle of an overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application;

[0021] Figure 2 is a schematic cross-sectional view of a cross-sectional structure of an overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application;

[0022] Figure 3 It is a partial three-dimensional structural schematic diagram of another overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application;

[0023] Figure 4 It is a partial three-dimensional structural schematic diagram of another overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application.

[0024] Figure numerals: 1. first resistor; 2. light emitting electrode tube; 3. surge absorption diode; 4. second resistor; 5. diode; 6. positive electrode; 7. negative electrode; 8. protective shell; 9. printed circuit board assembly; 10. fastener; 11. insulating board. DETAILED DESCRIPTION

[0025] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, not all of the embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0027] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0028] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0029] Before explaining the overvoltage suppressor for a contactor and the working method provided in the embodiment of the present application, the application scenario and implementation environment of the embodiment of the present application are first introduced.

[0030] The contactor is a widely used switching device, which mainly controls the connection and disconnection of the load circuit where the contactor is located by controlling the closing and separation of the moving contact and the static contact. The normal operation of the contactor is closely related to the contactor's closing stability. The distance between the moving contact and the static contact in the separated state will have a significant impact on the contactor's closing stability. The overvoltage suppressor is used in the contactor control circuit as a component of the contactor and is connected in parallel with the contactor electromagnetic coil. It can absorb the reverse electromotive force generated when the coil is powered off, and the light-emitting diode displays the state of absorbing the reverse electromotive force.

[0031] The existing overvoltage suppressor structure is to design a variable impedance material into the component structure, and electrically connect the signal conductive electrode (signal electrode) and the ground conductive electrode (ground electrode) through the variable impedance material. When the overvoltage suppressor is within the normal operating voltage range, the variable impedance material is in a high impedance state. At this time, the voltage and current on the signal conductive electrode will not be introduced into the ground conductive electrode. However, when an abnormal overvoltage surge occurs on the signal conductive electrode, the characteristic of the variable impedance material will be transformed into a low impedance state. At this time, the surge energy will be introduced from the signal conductive electrode through the variable impedance material to the ground conductive electrode and discharged into the ground terminal (ground). Therefore, by using the characteristics of the variable impedance material, the voltage on the signal conductive electrode can be maintained within a range that will not damage the circuit, thereby achieving the purpose of protecting the circuit.

[0032] However, the stability of the existing overvoltage suppressors used in contactors still needs to be improved.

[0033] Based on this, the present application provides an overvoltage suppressor for a contactor and a working method, which has a compact structure and is easy to install and connect to the outside. After the contactor coil control power supply voltage is powered off, it can absorb the reverse electromotive force generated by the contactor coil, and at the same time, a light-emitting diode indicates the operating state, thereby protecting the contactor coil and improving the reliability of the contactor.

[0034] Next, the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems will be described in detail through embodiments and in combination with the accompanying drawings. The embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of them.

[0035] Figure 1 is an electrical schematic diagram of an overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application. Figure 2 is a schematic cross-sectional view of a cross-sectional structure of an overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application, Figure 3is a partial three-dimensional structural schematic diagram of another overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application, Figure 4 It is a partial three-dimensional structural schematic diagram of another overvoltage suppressor for a contactor shown in an exemplary embodiment of the present application.

[0036] In an exemplary embodiment, Figure 1 and Figure 2 As shown, an overvoltage suppressor for a contactor is provided, the device comprising a first resistor 1, a light emitting diode 2, a surge absorption diode 3, a second resistor 4, a diode 5, a protective shell 8 and a printed circuit board assembly 9;

[0037] The first resistor 1, the second resistor 4, the diode 5, the light emitting diode 2 and the surge absorption diode 3 are all fixedly arranged on the printed circuit board assembly 9;

[0038] The printed circuit board assembly 9 is disposed in the protective shell 8 .

[0039] In one possible implementation, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, its specific installation structure includes a first resistor 1, a light emitting diode 2, a surge absorption diode 3, a second resistor 4, a diode 5, a protective shell 8, a printed circuit board assembly 9, a fastener 10, and an insulating plate 11. All electronic components are welded on the printed circuit board assembly 9, and the printed circuit board assembly 9 is fixed in the protective shell 9 with the fastener 10. The bottom of the protective shell 9 is sealed and insulated with an insulating plate 11.

[0040] Specifically, the diode 5 is connected in series with the surge absorption diode 2 and the second resistor 4, the light-emitting diode 2 is connected in series with the first resistor 1, and the negative end of the diode 5 is connected in parallel with the surge absorption diode 3, connected to the positive electrode 6 of the DC control power supply, and one end of the second resistor 4 is connected to the negative electrode 7 of the DC control power supply.

[0041] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the instructions, these steps are not necessarily executed in sequence according to the order of the instructions. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the above-mentioned embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0042] Corresponding to the above-mentioned embodiment of the overvoltage suppressor for contactor, the present application also provides an embodiment of a working method of the overvoltage suppressor for contactor.

[0043] In an exemplary embodiment, the overvoltage suppressor for the contactor works by absorbing the reverse electromotive force generated by the contactor coil after the contactor coil control power supply voltage is cut off, and the light emitting diode indicates the action state to protect the contactor coil.

[0044] It can be seen that the overvoltage suppressor for contactors provided in the embodiment of the present application has a compact structure and is convenient for installation and external wiring. After the contactor coil control power supply voltage is powered off, it can absorb the reverse electromotive force generated by the contactor coil, and at the same time, a light-emitting diode indicates the operating state, thereby protecting the contactor coil and improving the reliability of the contactor.

[0045] For the specific definition of the overvoltage suppressor for contactors and the working method, please refer to the definition of the overvoltage suppressor for contactors and the working method above, which will not be repeated here. Each module in the above-mentioned overvoltage suppressor for contactors and the working method can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0046] The technical features of the above embodiments may 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.

[0047] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An overvoltage suppressor for a contactor, characterized in that: It includes a first resistor, a light emitting diode, a surge absorption diode, a second resistor, a diode, a protective shell and a printed circuit board assembly; The first resistor, the second resistor, the diode, the light emitting diode and the surge absorption diode are all fixedly arranged on the printed circuit board assembly; The printed circuit board assembly is arranged in the protective shell.

2. The overvoltage suppressor for contactor according to claim 1, characterized in that: The diode is connected in series with the surge absorption diode and the second resistor.

3. The overvoltage suppressor for contactor according to claim 2, characterized in that: The light emitting diode is connected in series with the first resistor and in parallel with the surge absorption diode.

4. The overvoltage suppressor for contactor according to claim 3, characterized in that: The negative end of the diode is connected to the positive electrode of the DC control power supply, and one end of the second resistor is connected to the negative electrode of the DC control power supply.

5. The overvoltage suppressor for contactor according to claim 4, characterized in that: A fastener is installed in the protective shell, and the printed circuit board assembly is fixed in the protective shell through the fastener.

6. The overvoltage suppressor for contactor according to claim 5, characterized in that: An insulating plate is also provided at the bottom of the protective shell, and the protective shell is sealed and insulated by the insulating plate.

7. The overvoltage suppressor for contactor according to claim 5, characterized in that: The fasteners are two fastening bolts and screw holes.

8. A method for operating an overvoltage suppressor for a contactor, applied to the overvoltage suppressor for a contactor according to any one of claims 1 to 7, characterized in that: After the contactor coil control power supply voltage is cut off, the reverse electromotive force generated by the contactor coil is absorbed, and the light-emitting diode indicates the action status to protect the contactor coil.

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