Control method of arc-free breaking alternating current circuit

Abstract

The invention discloses a control method of an arc-free breaking alternating current circuit, which belongs to the technical field of power control, and comprises the following steps: a power supply step: converting an input control voltage into a coil working voltage of an electromagnetic actuating mechanism, and supplying power to an energy storage circuit at the same time; an input voltage detection step: detecting an input voltage value in the power supply step, and comparing an input control voltage value with a set value; in the closing step, the control circuit outputs a forward pulse to the coil in a delayed mode, and the electromagnetic executing mechanism switches on the main loop at the next zero crossing point; in the disconnection step, the electromagnetic executing mechanism disconnects the main loop at the next zero crossing point; the problem that electric arcs are generated in the on-off switching process of the alternating-current load is solved, high efficiency and energy conservation are achieved, the time of closing and opening the circuit of the electromagnetic executing mechanism is controlled in a time-delay mode through software, time-delay on-off control is conducted on the contact in a time-sharing mode so that a real current zero crossing point can be found, and the problem of electric corrosion of the contact in the load switching process is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of electric power control, and in particular relates to a control method for arc-free breaking AC circuits. Background technique [0002] AC contactors are generally used in the industrial control scenarios of power frequency AC single-phase AC220V or three-phase AC380V. Since the power frequency AC working characteristic is that the current and voltage alternately change at a relatively fixed frequency, and the voltage is relatively high, the electromagnetic coil controls the main circuit. At the moment of on and off, arcing will occur on the contacts. Arcing will not only cause a serious decrease in the working life of the contacts, but also cause electromagnetic radiation interference during the arcing process and affect the normal work of surrounding electronic circuits and wireless communications. In the application of inductive load control, due to the influence of arcing, the electrical life is genera...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for breaking AC circuits without arcing, so as to solve the problem of serious arcing during the switching process of AC inductive loads on and off

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