Question

In case of MPM with two pulses per half cycle of width = d each and ɣ as the distance between the first pulse and ωt=0, for eliminating the nth harmonic from the output voltage, the value of gamma (ɣ) must be equal to

(a) 0

(b) π

(c) π/n

(d) d/n

This question was addressed to me by my college professor while I was bunking the class.

This key question is from PWM Inverters-2 in portion Inverters of Power Electronics

Answer 1

The correct choice is (c) π/n

Easy explanation: If gamma = π/n , the whole nth output voltage comes becomes zero.