Question

Latching current for an SCR is 100 mA, DC source of 200 V is also connected from the SCR to the L load. Compute the minimum width of the gate pulse required to turn on the device. Take L = 0.2 H.

(a) 50 μsec

(b) 100 μsec

(c) 150 μsec

(d) 200 μsec

The question was asked during a job interview.

This question is from Thyristors-4 in division Power Electronics Devices of Power Electronics

Answer 1

Correct answer is (b) 100 μsec

Best explanation: For L load, E = L di/dt

I = E/L t

Therefore, 0.100 = 200t/0.2

T = 100 μsec.