Energy saver for AC contactor

Abstract

The invention discloses an energy saver for an AC contactor, which comprises a half-wave rectification circuit, a square-wave generation circuit, a DC voltage-regulated power supply circuit, a signal converter and a charge / discharge circuit. The half-wave rectification circuit is used for half-wave rectification of mains power, the square-wave generation circuit is used for providing square-wave input for the signal converter, the DC voltage-regulated power supply circuit is used for providing a stable DC power supply for the signal converter, the signal output end of the signal converter is used for providing a control signal for the charge / discharge circuit, and the load of the charge / discharge circuit is an AC contactor. The current of the coil of the AC contactor can be changed through changing the pulse width of the output end of the signal converter, thereby realizing that the high current can flow through the coil of the AC contactor when the contacts of the AC contactor are closed, and the low current can flow through the coil of the AC contactor when the closed state of the contacts of the AC contactor is maintained. Therefore, the invention realizes the energy-saving operation of the AC contactor, reduces the noise and the temperature rise of the coil of the AC contactor, and prolongs the service life of the AC contactor.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an energy saver for an AC contactor. Background technique [0002] The AC contactor is a low-voltage electrical appliance widely used in industrial production. It is mainly used to control the operation and stop of electrical equipment such as motors. After the ordinary AC contactor is closed, the coil of the AC contactor is still connected with AC , The power consumption caused by iron loss and copper loss is very large, so the coil generates heat and noise, which not only wastes electric energy, but also the insulation of the coil is easy to age, which shortens the life of the AC contactor. In the environment of energy saving and emission reduction, reducing the energy consumption of AC contactors has significant economic and social benefits. [0003] Most of the AC contactor energy savers on the market are implemented by single-chip microcomputers, w...

AI Technical Summary

Problems solved by technology

[0003] Most of the AC contactor energy savers on the market are implemented by single-chip microcomputers, which are relatively expensive and are easily interfered and cause internal program execution errors

Images