Scr Capacitor Turn-Off Circuit

Posted on Aug 21, 2012

After the SCR turns on, CI charges up to almost the full supply voltage via R3 and the anode of the SCR. Whe

Scr Capacitor Turn-Off Circuit
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n S2 is subsequently closed, it clamps the positive end of CI to ground, and the charge on CI forces the anode of the SCR to swing negative momentarily, thereby reverse-biasing the SCR and causing it to turn off. The capacitor"s charge bleeds away rapidly, but it has to hold the SCR"s anode negative for only a few /is to ensure turn-off. CI must be a nonpolarized type.

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