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Temperature Triggering
At high temperature the leakage current of junction J2 increases. This leakage current is collector current of tr1 and Tr2. So rise in temperature increases leakage current which is responsible to increase IC1 and IC2 then (α1 + α2 ) tends to unity and thyristor will get tumed on.
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Critical Rate of Rise of Voltage It depends on the junction temperature higher the junction temperature lower the critical rate of rise of voltage. It is also known as
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