Energy-saving AC contactor employing control current

Abstract

The invention discloses an energy-saving AC contactor employing a control current, and the contactor comprises a conventional AC contactor and an electronic unit 100, wherein the conventional AC contactor consists of a movable contact MC, a normally-closed contact NC, a normally-opened contact NO, a moving iron core M, a static iron core G, a reset spring F, and an excitation spring L. The contact is characterized in that the electronic unit 100 consists of a transient voltage suppression diode TVS, a voltage-dividing circuit 101, a DC power circuit 102, a control pulse generation circuit 103, a switching circuit 104, a bridge circuit 105, and a common end E.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a "power-saving AC contactor using control current" which can efficiently save electricity 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 contactor. This conventional AC contactor is mainly co...

AI Technical Summary

Problems solved by technology

[0010] 1. Unnecessary power consumption: As mentioned above, in the pull-in and hold stages, the same AC voltage is passed through the excitation coil of the conventional AC contactor, which makes the hold power too large, resulting in unnecessary power loss;

[0011] 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;

[0012] 3. Annoying AC noise

[0017] This is one of the reasons why there are many research results on the "energy-saving AC contactor" referred to in the prior art, but few practical applications.

[0018] 2. The "energy-saving AC contactor" referred to in the prior art is generally equipped with a control circuit, and the control current is only used for the control circuit without comprehensive utilization

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