Single-pulse AC contactor capable of suppressing transient voltage

Abstract

The invention discloses a monopulse alternating current contactor with a function of suppressing transient voltage. The monopulse alternating current contactor comprises a conventional alternating current contactor and an electronic unit 100, wherein the conventional alternating current contactor consists of movable contacts MC, normally closed contacts NC, normally-open contacts NO, a movable iron core M, a static iron core G, a reset spring F, and a magnet exciting coil L; and the monopulse alternating current contactor is characterized in that the electronic unit 100 comprises a transient voltage suppressor diode TVS, an AC-DC switching circuit 101, a single pulse generation circuit 102, a switching circuit 103, a bridge circuit 104 and a voltage reduction circuit 105.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a "single-pulse AC contactor capable of suppressing transient voltage" which is controlled by a single pulse, can save electricity efficiently, and has the function of suppressing transient voltage. Background technique [0002] Alternating Current Contactor (Alternating Current Contactor) is a low-voltage electrical appliance that is widely used. As of 2015, there are more than one billion AC contactors running online in my country, and the number is increasing at an annual rate of 80 million. Its working principle is to use the electromagnet to drive the movable contact to separate or close the normally closed contact or normally open contact, so as to cut off or connect the circuit. It is suitable for starting or controlling three-phase induction motors and other electrical equipment. [0003] figure 1 It is a working principle diagram of a conventional AC co...

AI Technical Summary

Problems solved by technology

[0011] 1. Unnecessary power consumption: As mentioned above, in the pull-in and holding phases, the excitation coils of conventional AC contactors are all connected with the "same" AC voltage, which makes the holding power too large, resulting in unnecessary electric energy loss;

[0012] 2. Heating: The evil result of unnecessary power loss is "heating and heating". In severe cases, it will even burn the excitation coil of the conventional AC contactor;

[0013] 3. Annoying AC noise

[0015] The above-mentioned prior art has indeed made useful explorations and achieved certain achievements in improving the performance of conventional AC contactors, but generally has the following defects: no "transient voltage (voltage transient)" suppression measures, no "suppression Transient Voltage" function

[0017] This is one of the reasons why most of the "energy-saving AC contactors" referred to in the prior art remain on paper and are rarely used.

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