Question

Find the distortion factor (μ), for a single phase half wave bridge inverter with dc source Vs = 1 kV.

(a) 0.87

(b) 1

(c) 0.9

(d) 0.7

I had been asked this question in an internship interview.

This intriguing question comes from Quality of Inverters topic in chapter Inverters of Power Electronics

Answer 1

Correct choice is (c) 0.9

To explain: μ = V1/Vr

V1 = rms value of fundamental component = 2Vs/π√2

Vr = Total rms output voltage = Vs/2

μ = (2Vs/π√2) x (2/Vs) = 2√2/π = 0.9.