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Arc extinguishing circuit of direct-current contactor

A DC contactor and arc extinguishing circuit technology, applied in circuits, electrical switches, electrical components, etc., can solve the problems affecting the electrical life of the contactor, electromagnetic interference of the surrounding environment, burning of the contacts of the contactor, etc., and prolong the electrical life. , The effect of reducing electromagnetic interference and eliminating discharge sparks

Inactive Publication Date: 2014-08-06
刘爱民
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many kinds of contactors, and the contactors with contacts will generate electric sparks when switching, which will cause electromagnetic interference to the surrounding environment, cause burning and damage to the contacts of the contactors, and seriously affect the electrical life of the contactors
This is especially true for high-power DC mechanical contactors. In many occasions, the electrical life of high-power DC mechanical contactors is less than one percent of its mechanical life. Therefore, high-power DC mechanical contactors often use various arc-extinguishing technologies. The most advanced and effective The best solution is vacuum plus magnetic blowing technology, but it only alleviates the problem of ignition of contactor contacts, and does not fundamentally solve this problem

Method used

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  • Arc extinguishing circuit of direct-current contactor

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Embodiment Construction

[0011] reference figure 1 , The embodiment of the present invention includes an arc extinguishing circuit 2 and a control circuit 3. The arc extinguishing circuit 2 includes a triode 22 in parallel with a varistor 23, and then is formed in series with an auxiliary electromagnetic switch 21, and is connected to both ends of the contactor main switch 1; the control circuit 3 receives the contactor switch command KC, and drives the triode 22. The contactor main switch 1 and auxiliary electromagnetic switch 21 work to complete the contactor switch action.

[0012] The main circuit of the embodiment of the present invention is from A+ to A-. When the contactor main switch 1 and the auxiliary electromagnetic switch 21 are both open, it is in the open state. At this time, the control circuit 3 receives the KC closing command, and first drives the auxiliary electromagnetic switch to close. Switch 21 and drive the transistor 22 to conduct at the same time. After the auxiliary electromagn...

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Abstract

An arc extinguishing circuit of a direct-current contactor comprises an arc extinguishing loop and a control circuit. The arc extinguishing loop is formed by connecting an audion with a voltage dependent resistor in parallel and then connecting the audion and the voltage dependent resistor with an auxiliary switch in series and is installed at the turn-on end and the turn-off end of a contactor master switch in parallel. The control circuit drives the audion, the auxiliary switch and the contactor master switch to work. The arc extinguishing circuit eliminates discharge sparks caused when the contactor master switch is operated thoroughly, enables the electrical life of the direct-current large-current contactor to be prolonged greatly, and enables electromagnetic interference to be reduced greatly.

Description

Technical field [0001] The invention belongs to a contactor protection circuit, and relates to a DC mechanical contactor contact arc extinguishing circuit. Background technique [0002] There are many types of contactors. When a contactor with a contact is switched on and off, electric spark will be generated, causing electromagnetic interference to the surrounding environment, burning and damage to the contactor's contact, and seriously affecting the electrical life of the contactor. This is especially true for high-power DC mechanical contactors. In many cases, the electrical life of high-power DC mechanical contactors is less than one percent of the mechanical life. Therefore, high-power DC mechanical contactors often use various arc extinguishing technologies, the most advanced and effective The best is the vacuum and magnetic blowing technical solution, but it only alleviates the contactor contact ignition problem, and does not fundamentally solve this problem. Summary of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/30
Inventor 刘爱民
Owner 刘爱民
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