LINE_POWERED_SWITCH

Published:2009/7/13 21:43:00 Author:May | From:SeekIC

When AC line twitch is closed, power is not applied to load until after line voltage next goes through zero. Identical circuits control each half of AC cycle. Transistor turn-on at 1.4 V prevents SCR from triggering until 0.013 ms (less than one-third electrical degree) after next zero-crossing point.-A. S. Roberts and O. W. Craig, Efficient and Simple Zero-Crossing Switch, EDN|EEE Magazine, Aug. 15, 1971, p 46-47.



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