SCR_CAPACITOR_TURN_OFF_CIRCUIT

Published:2009/7/9 23:24:00 Author:May | From:SeekIC

After the SCR tums on, C1 charges up to almost the full supply voltage via R3 and the anode of the SCR. When S2 is subsequently closed, it clamps the positive end of C1 to ground, and the charge on C1 forces the anode of the SCR to swing negative momentarily, thereby reverse-biasing the SCR and causing it to tum off. The capacitor's charge bleeds away rapidly, but it has to hold the SCR's anode negative for only a few ps to ensure turn-off. C1 must be a nonpolarized type.



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