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In the below given circuit, when the main SCR T1 is commutated at t2, the load voltage is

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in Power Electronics by (27.1k points)
In the below given circuit, when the main SCR T1 is commutated at t2, the load voltage is

(a) Vs

(b) 0

(c) 2Vs

(d) Vs + Ldi/dt

I have been asked this question in an international level competition.

The origin of the question is Thyristor Chopper Circuits in division Choppers of Power Electronics

1 Answer

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by (45.1k points)
The correct answer is (c) 2Vs

Easiest explanation: The main SCR T1 is commutated by the triggering of the TA which then makes the capacitor revere bias the main SCR T1. The load current then flows through Vs-C-TA-Load. Hence, Vo = Vs + (capacitor voltage).

As the capacitor is already charged to a voltage Vs. Vo = 2Vs.

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