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Scr Capacitor Turn-Off Circuit

2017-08-19 08:43  
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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

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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