Alternating current contactor intelligent control module with high speed pulse width modulation function

Abstract

The invention relates to an alternating current contactor intelligent control module with a high speed pulse width modulation function. The alternating current contactor intelligent control module comprises an alternating current / direct current (AC / DC) power supply, the AC / DC power supply supplies power for an alternating current contactor coil sequentially through a rectification filter circuit and an electronic power switch, and the alternating current contactor intelligent control module further comprises a voltage sampling circuit, a single chip microcomputer control system, a double-way digital-analog (DA) switching circuit, a sawtooth wave generating circuit, a square wave clock signal, a high speed pulse width modulator, a bootstrap circuit, a compensating circuit, a switching point detection circuit, a hall current sensor, a follow current circuit, a low voltage maintaining loop and an automatic constant voltage / constant current switching circuit. According to the alternating current contactor intelligent control module with the high speed pulse width modulation function, a novel Buck structure is used as a coil power level topology, orders of a power level circuit are lowered, a system is easy to stabilize, the compensating circuit is easy to design, the hall current sensor is used for current sampling, the impedance characteristic of a coil power level circuit is not changed, advantages of high accuracy, isolation characteristics, large bandwidth and the like of a current sensor are fully utilized, and closed-loop control with the isolation characteristics is formed.

Description

technical field [0001] The invention relates to the field of intelligent control of equipment, in particular to an intelligent control module of an AC contactor with a high-speed pulse width modulation function. Background technique [0002] According to statistics, more than 80% of the electric energy of power users is transmitted through the electrical equipment at the user end and consumed on the end user equipment. Therefore, in the huge smart grid and energy management system, the user-side power equipment and power system are important components, and their reliability and intelligence directly affect the reliability and operation of the smart grid. Electromagnetic AC contactors are widely used in user terminals as a large category of products. In recent years, their intelligent progress has attracted widespread attention. For the traditional electromagnetic AC contactor, its operating conditions are complex and various, and in different systems, there are different w...

AI Technical Summary

Problems solved by technology

[0005] The structure of traditional AC contactor products is highly dispersed, and it is difficult to control accurately. Even if the operation control program is well designed, it often fails to achieve a good control effect during operation.

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