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Unit - II Triggering and Commutation methods of SCR 2.1 Concept of turn ON mechanism for given SCR: High voltage, thermal triggering, dv/dt triggering, gate triggering 2.2 Gate trigger circuits: Types of gate signals: DC signal, AC signal and pulse signal 2.3 Thyristor Triggering Circuits: Resistance Triggering Circuit, Resistor-Capacitor (RC) Triggering Circuit, half wave and full wave triggering Circuit, UJT (Unijunction Transistor) Triggering Circuit, Pulse Transformer Triggering Circuit, UJT/ PUT-relaxation oscillator circuit 2.4 Turn OFF ( commutation) methods: Natural and Forced Commutation, Types: Class A, Class B, Class C, Class D, Class E, Class F 2.5 SCR protection circuits: Need, Factors causing permanent damage to SCR, causes of over voltage and over current, Over voltage protection使用RC Snubber电路和非线性电阻的电路，使用保险丝操作，电子撬棍电路
314363基本电源电子
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