Control module for AC vacuum contactor

Abstract

The invention discloses a control module for an AC vacuum contactor, which belongs to the technical field of AC vacuum contactors and comprises a control module, wherein the input end of the control module is electrically connected with the output end of power supply input, and the output end of the control module is electrically connected with the input end of power supply output. According to the control module for the AC vacuum contactor, a constant-voltage starting circuit is arranged, the nonlinear characteristic of a piezoresistor is utilized, redundant current is absorbed to protect sensitive elements in the circuit, harmonic waves generated in the circuit can be cancelled out by a bridge rectifier bridge at the same time, so that the harmonic wave of the AC input current can be reduced. Meanwhile, the harmonic amplitude in the DC output voltage can be reduced, the ripple frequency can be improved, an absorption capacitor can play a role similar to a low-pass filter, and peak voltage caused by stray inductance of a busbar is eliminated, so that constant-voltage starting is achieved, the purpose of vacuum no-air-exposed electric arc of switching operation is achieved, and theexplosion-proof performance is better.

Description

technical field [0001] The invention belongs to the technical field of AC vacuum contactors, in particular to a control module for AC vacuum contactors. Background technique [0002] The vacuum contactor is mainly composed of a vacuum interrupter and an operating mechanism. It is used for direct or remote connection and disconnection of the main circuit. Because the main contact works in a high vacuum environment, it has the advantages of no exposed arc, small size, light weight, long life and long maintenance cycle, so it is suitable for coal, petroleum, chemical industry, metallurgy, electric power, machinery and transportation and other fields Used to control three-phase AC motors or switch on and off other electrical loads. [0003] At present, in the existing vacuum contactors in the market, the auxiliary switch still adopts the mechanical switch with the air exposed to the arc, because it breaks the DC current with high voltage, the breaking arc is large, and the aux...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a control module for AC vacuum contactors, which solves the problem that the existing vacuum contactors break high-voltage DC currents, which cause large breaking arcs and are very easy to burn auxiliary Energy-saving contacts, resulting in poor contact, causing abnormal startup of vacuum contactors, burning coils and loads, short operating life, and poor explosion-proof performance

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