Question

The Thyrist or shown in the circuit below is triggered on by a gate current of 1.8 mA and a forward break over voltage of 170 V corresponding to this gate current. The applied AC voltage is 240 V (Peak), load resistance Lp is 100 ohms and holding current is zero. Determine: (a) firing angle(b) conduction angle(c) average load power.

Fig: 1

Fig: 2

Fig: 3