A Novel intelligent Load Control Switch Based on Dynamic Compensation Method for Current Zero-crossing Point

摘要

A new-type of intelligent electric load control switch composed of three separate magnetic latching relays is presented. A method of AC current and voltage sampling and root mean square (RMS) calculation is employed to ensure reliable operation of the electric load. The method possesses such features as less hardware requirements, good real-time performance, high frequency interference eliminating. Current zero-crossing break is the most outstanding advantage of the switch. In order to guarantee the magnetic latching relay shut off at current zero-crossing point accurately in long term operation, a dynamic compensation for delay time is proposed based on all-around research of the properties of magnetic latching relay actuation time. Finally, an application of the switch in the electric load control system constructed via CAN bus and ZigBee network is well brought forth.