Question

For a step-down chopper shown in the figure below, dc source voltage = 230 V and the voltage drop across the chopper = 2 V. Find the value of average output voltage for a duty cycle of 0.4.

(a) 230 V

(b) 92 V

(c) 90 V

(d) 91.2 V

This question was addressed to me in a national level competition.

The doubt is from Choppers-4 in chapter Choppers of Power Electronics

Answer 1

Correct answer is (d) 91.2 V

Best explanation: The voltage drop across the switch occurs only when it is on.

Vo = (Vs – 2) x Duty cycle = 91.2 V.