Question

In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with the initial voltage across the capacitor (Vs) = 230 V. Find the conduction time for auxiliary thyristor.

(a) 0.23 μs

(b) 6.57 μ

(c) 31.41 μs

(d) 56 μs

The question was asked during an interview for a job.

I'd like to ask this question from SCR Commutation Techniques-1 topic in division Other Circuits of Power Electronics

Answer 1

Correct choice is (c) 31.41 μs

The best explanation: Ip = Vs x √C/L

ω = 1/√LC

t = π/ω.