Energy-saving AC contactor with normally open auxiliary contact

Abstract

The invention discloses a power-saving alternating current contactor applying a normally open auxiliary contact. The power-saving alternating current contactor comprises two parts, including a normal alternating current contactor consisting of a movable contact, a normally closed contact, a normally open contact, a movable iron core, a static iron core, a reset spring, a magnet exciting coil and a normally open auxiliary contact, and an electronic unit, wherein the power-saving unit comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a transient voltage suppressor diode, a field effect transistor, an AC1 end, an AC2 end, a DC1 end and a DC2 end.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a "power-saving AC contactor using a normally open auxiliary contact" which uses a normally open auxiliary contact to realize high efficiency and power saving. 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 contacto...

AI Technical Summary

Problems solved by technology

[0013] 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;

[0014] 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;

[0015] 3. There is annoying AC noise;

[0018] 1. The structure is complex and difficult to implement;

[0019] 2. There are too many electronic devices used, and the electronic circuit is too complicated; the "AC contactor power saver" controlled by a single-chip microcomputer is susceptible to electromagnetic interference from the AC contactor itself or electrical appliances such as motors, resulting in internal program execution errors and "flying jumps". "Miscontrol - this miscontrol can lead to catastrophe on some occasions!

[0020] 3. The price of the products produced is too high. For example, the price of the QXJB AC contactor power saver produced by a certain company in Zhuhai City, Guangdong Province is as high as 1,500 yuan per set! The price of a small AC contactor is only more than 20 yuan, and the price of a medium-sized AC contactor is only a few hundred yuan. Such an expensive "QXJB AC contactor power saver" will make very few users

[0021] 4. Due to the complex electronic circuit and many electronic devices used, it is difficult to integrate the power saving control part of the AC contactor with the AC contactor. Inconvenient, troublesome wiring

[0022] 5. Due to the complex electronic circuit and many electronic devices used, the power consumption of the power-saving control part of the AC contactor (IC power consumption, actuator power consumption, etc.) will increase, and some are even as large as small The holding power of the contactor is comparable to that of

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