Optical coupling SCR circuit

Published:2011/4/29 22:26:00 Author:Nicole | Keyword: Photo coupler, SCR | From:SeekIC

This circuit uses optical coupler to isolate control logic circuit and SCR power circuit. SN7475 is slow trigger, it is used to receive control singal. TIL111 is optical coupler. Q1, Q2 power supply circuit is composed of IN4004, C1, C2, R4, R5 and 1N4733. When SN7475'S Q=0, LED lights up, Q1 and Q2 turn on, triggering SCR TIC263 to turn on. On the contrary, SCR cuts off.



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