Question

A single phase full bridge inverter is fed from a dc source such that the fundamental component of output voltage = 230 V. Find the rms value of SCR and diode current respectively, for a R load of 2 Ω.

(a) 115 A, 80 A

(b) 81.33 A, 36.2 A

(c) 36.2 A, 0 A

(d) 81.33 A, 0 A

This question was posed to me during an interview.

This question is from Single Phase VSI-4 topic in chapter Inverters of Power Electronics

Answer 1

Correct choice is (d) 81.33 A, 0 A

The explanation is: Fundamental component of load current = V/R = 230/2 = 115 A.

SCR current = 115/2 = 81.33 A

Diode current = 0 as the diodes do not come into picture for R loads.