Question

In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with initial voltage across the capacitor (Vs) = 230 V. Find the peak value of resonant current.

(a) 560 A

(b) 460 A

(c) 360 A

(d) 260 A

The question was asked during an interview for a job.

The origin of the question is SCR Commutation Techniques-1 topic in section Other Circuits of Power Electronics

Answer 1

Right choice is (b) 460 A

To explain: Ip = Vs x √C/L.