Question

Find the average output voltage for a type D chopper if it is given a dc supply of 220 V. Chopper frequency is 2 kHz and both the chopper switches are operated for 0.3 ms.

(a) 220 V

(b) 108 V

(c) 98 V

(d) 44 V

The question was asked in an interview for job.

This interesting question is from Type D Chopper in chapter Choppers of Power Electronics

Answer 1

The correct answer is (d) 44 V

To elaborate: T = 1/f = 0.5 ms

Ton = 0.3 ms

Toff = 0.2 ms

Vo = Vs (Ton – Toff)/T = 220 x (1/5) = 44 V.