Question

A single-phase full controlled converted with RLE load will act like a line-commutated inverter when the firing angle α

(a) α > 180°

(b) α > 90°

(c) α < 90°

(d) α = 90°

This question was posed to me in an internship interview.

My enquiry is from Single Phase FW AC-DC-3 topic in division Converters of Power Electronics

Answer 1

Right option is (b) α > 90°

To explain I would say: It will act like a inverter i.e. most of the current would flow from the battery or back emf E to the source. For α=90° it will not act like a converter nor an inverter.