SCR AC switch

Published:2011/4/22 18:57:00 Author:Nicole | Keyword: SCR, switch | From:SeekIC

Although bidirectional SCR is suitable for AC load switch, it should adopt unidirectional SCR when the work voltage is high or the load current is large. In figure, the circuit SCR gate is controlled by small transformer output rectified voltage loop directly. The advantage of using DC trigger is: it can connect high resistance load circuit. Technical data of this circuit: work voltage: 380V; load resistance: 500Ω~80kΩ; control current: about 6.5mA. Transformer data: the number of windings n1: 7400 turns, 0.08mm enameled copper wire; the number of windings n2, n3: 230 turns, 0.25mm enameled copper wire.



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