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In the below given type E chopper circuit, when CH3 and CH2 are switched on and then CH3 is switched off after some time, then

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+1 vote
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in Power Electronics by (27.1k points)
In the below given type E chopper circuit, when CH3 and CH2 are switched on and then CH3 is switched off after some time, then

(a) load current falls to zero

(b) negative current freewheels through CH2, D4

(c) positive current freewheels through CH2, D4

(d) none of the mentioned

I had been asked this question during an online exam.

This is a very interesting question from Type E Choppers-2 in chapter Choppers of Power Electronics

1 Answer

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by (45.1k points)
The correct option is (b) negative current freewheels through CH2, D4

The best I can explain: When CH3 is first on then, load gets connected to Vs and charges the inductor L. When it CH3 switched off, current has to flows through through the same direction (negative) because of the L. Current starts to freewheel from CH2 and D4.

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