Silent and noise-free alternating current contactor capable of saving electricity

Abstract

The invention discloses a silent and noise-free alternating current contactor capable of saving electricity. The alternating current contactor comprises a traditional alternating current contactor body and an electricity-saving and a noise-free unit. A threshold control circuit is composed of a voltage dependent resistor (VDR1), and an energy storage circuit is composed of a capacitor (C).

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an "electricity-saving, quiet and noiseless AC contactor" which has both power-saving and noise-suppressing functions. Background technique [0002] AC contactor is a low-voltage electrical appliance that is widely used. As of 2012, there are as many as 1 billion AC contactors in operation in my country, and the number of AC contactors is increasing at a rate of 80 million per year. 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 co...

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;

[0015] 4. There is annoying AC noise;

[0016] 5. Low power factor

[0019] 1. The structure is complex and difficult to implement;

[0020] 2. There are too many electronic devices used, and the electronic circuit is too complicated; the "AC contact" controlled by single-chip microcomputer

[0021] "Power saver" is susceptible to electromagnetic interference from the AC contactor itself or electrical appliances such as motors, resulting in internal program execution errors and "flying" miscontrols—this miscontrol will lead to catastrophe in some occasions!

[0022] 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

[0023] 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

[0024] 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 (AC-DC conversion loss, IC power consumption, actuator power consumption, etc.) will increase. even to the point where it is comparable to the holding power of a small contactor

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.”

Images