Forward voltage triggering , Electrical Engineering

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Forward Voltage  Triggering

If Va is increased the collector to emitter voltages of both  transistor are  also increased. Hence  the leakage current at J2 increase. This  leakage current is the  collector current of transistor Tr2. It means  with the  increase  in IC2 IC1 Increased any this causes α1 + α2  tends to unity which is responsible to turn on the thyrisotr.


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