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Direct-current contact switch breaking protective circuit and contactor

A contact switch and breaking protection technology, which is applied to emergency protection circuit devices, circuits, electric switches, etc., can solve problems such as limited absorption capacity, failure to suppress arcs, and reduce arcs, so as to prolong service life, improve breaking capacity and breaking The number of times, the effect of suppressing arc generation

Inactive Publication Date: 2012-10-10
SHANGHAI NOARK ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest deficiency of traditional arc extinguishing devices and auxiliary technical measures is that they cannot suppress the generation of arcs between contacts, and the foothold is to reduce the intensity of arc occurrence
For example, the metal grid arc extinguishing device achieves the purpose of arc extinguishing by dividing the arc; there is also the use of RC absorption circuit to absorb the jump high voltage generated when the contact breaks the arc, and its absorption capacity is very limited

Method used

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  • Direct-current contact switch breaking protective circuit and contactor
  • Direct-current contact switch breaking protective circuit and contactor
  • Direct-current contact switch breaking protective circuit and contactor

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the drawings and preferred embodiments.

[0028] figure 1 It is a schematic diagram of the circuit principle of the embodiment of the present invention. See figure 1 The DC contact switch breaking protection circuit of the present invention (referred to as the CDR network) includes a capacitor C and a diode D. The function of the diode D is to use its volt-ampere characteristics to slow down the impact of the pulse current on the capacitor C, and the other is to use its reverse The characteristic limits the discharge current of the capacitor C and separates the charge and discharge circuits of the capacitor C. One end of the capacitor C is coupled with the positive terminal of the DC contact switch K, the other end is coupled with the anode of the diode D, and the cathode of the diode D is coupled with the negative terminal of the DC contact switch K; two ends of the diode D are connected in parallel...

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Abstract

The invention discloses a direct-current contact switch breaking protective circuit and an alternating-current contactor equipped with the direct-current contact switch breaking protective circuit. The direct-current contact switch breaking protective circuit comprises a capacitor, a diode, and a discharging path of the capacitor, wherein the discharging path is in a parallel connection with the diode, one end of the capacitor is coupled with a positive electrode end of a direct-current contact switch, the other end of the capacitor is coupled with a positive electrode of the diode, and a negative electrode of the diode is coupled with a negative end of the direct-current contact switch. According to the invention, electric arcs can not be generated at all between contacts when the switch breaks a direct-current high voltage and a high current, the breaking ability and allowable breaking times of the direct-current contact switch are increased, the service life of the direct-current contact switch of the alternating-current contactor equipped with the breaking protective circuit is prolonged significantly.

Description

Technical field [0001] The invention relates to the field of electrical appliance protection devices, and more specifically, to a DC contact switch breaking protection circuit and an AC contactor equipped with the DC contact switch breaking protection circuit. Background technique [0002] Arc is a physical phenomenon often encountered in the operation of DC contact switching appliances. When the voltage between the contacts reaches the arcing voltage and the current reaches the arcing current, an arc will be generated in the contact gap. In order to reduce the ablation of the contacts by the arc and improve the reliability of electrical appliances, usually switching appliances need to take necessary arc extinguishing measures to reliably extinguish the arc. The devices used for this purpose are collectively called arc extinguishing devices. [0003] Chinese patent document CN100435252C disclosed on November 19, 2008 an electrical DC contact switch device with a device for arc exti...

Claims

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Application Information

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IPC IPC(8): H02H7/22H01H9/40
Inventor 刘津平李强
Owner SHANGHAI NOARK ELECTRIC
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