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For the below given voltage commutation circuit, find the peak value of voltage across the freewheeling diode FD.

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in Power Electronics by (27.1k points)
For the below given voltage commutation circuit, find the peak value of voltage across the freewheeling diode FD.

(a) Vs

(b) 0

(c) 2Vs

(d) Vs + Ldi/dt

I have been asked this question in class test.

The origin of the question is Thyristor Chopper Circuits-2 in chapter Choppers of Power Electronics

1 Answer

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

To explain: 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 = Voltage across FD = 2Vs.

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