Power-saving alternating current contactor with threshold voltage

Abstract

The invention discloses a power-saving alternating current contactor with a threshold voltage. The power-saving alternating current contactor with the threshold voltage is composed of a first voltage-controlled switching circuit, an energy-storing circuit and a second voltage-controlled switching circuit, and is characterized in that the power-saving alternating current contactor with the threshold voltage is a network with four ports, the port N1 and the port N2 are input ports, and the port P1 and the port P2 are output ports; the input port N1 and the input port N2 are connected with the S1 end and the S2 end of the AC voltage respectively, and the output port P1 and the output port P2 are connected with the A1 end and A2 end of a magnet exciting coil L of a traditional alternating current contactor; the N1 end, the first voltage-controlled switching circuit, the second voltage-controlled switching circuit, the energy-storing circuit and the N2 end are sequentially connected in series, the P1 end is led out from the connecting position of the second voltage-controlled switching circuit and the energy-storing circuit, and the P2 end is connected with the N2 end.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a power-saving AC contactor with a power-saving function and provided with a threshold voltage. Background technique [0002] AC contactor is a low-voltage electrical appliance that is widely used. Its working principle is to use the electromagnet to drive the moving contact (moving contact) and the static contact (moving contact) to close or separate, so as to achieve the purpose of connecting or cutting off the circuit. It is suitable for starting or controlling three-phase induction motors and other electrical equipment. [0003] figure 1 It is the working principle diagram of the traditional AC contactor. This traditional AC contactor is mainly composed of a moving iron core, a static iron core, an excitation coil, a return spring, a moving-break contact, and a moving-closing contact. When the excitation coil is connected to AC220V, AC110V or AC380V voltag...

AI Technical Summary

Problems solved by technology

[0012] 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 traditional AC contactor, which makes the hold power too large, resulting in unnecessary electric energy loss;

[0013] 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 traditional AC contactor;

[0017] 1. The structure is complex and difficult to implement;

[0018] 2. Too many electronic devices are 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!"

[0019] 3. The price of the products produced is too high. For example, the price of the QXJB AC contactor power saver produced by a 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

[0020] 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

The main reason is that the price of energy-saving contactors is relatively expensive, and users cannot accept the one-time investment. The country needs to increase policy efforts in the promotion of energy-saving contactors to promote the wide application of energy-saving contactors.”

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