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Find the expression for effective input resistance of a step down chopper. With R load and duty cycle = α.

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in Power Electronics by (27.1k points)
Find the expression for effective input resistance of a step down chopper. With R load and duty cycle = α.

(a) R x α

(b) R/2

(c) 0

(d) R/α

This question was addressed to me during an online exam.

I want to ask this question from Choppers-3 in section Choppers of Power Electronics

1 Answer

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by (45.1k points)
The correct option is (d) R/α

Easy explanation: Effective input resistance of the chopper circuit = (dc source voltage)/(average source current) = (Vs.R)/(Vs.α) = R/α.

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