Question

The average gate power dissipation for an SCR is 0.5 Watts the voltage applied to the gate is Vg = 10 V. What is the maximum value of current Ig for safe operation?

(a) 0.25 A

(b) 10 A

(c) 0.05 A

(d) 0.1 A

I had been asked this question during a job interview.

This intriguing question comes from Thyristors-4 in section Power Electronics Devices of Power Electronics

Answer 1

Correct answer is (c) 0.05 A

To explain: Vg.Ig = 0.5 W, the power dissipation mustn’t exceed the average power dissipation.