Question

Line-commutated inverters have

(a) AC on the supply side and DC on the load side

(b) AC on both supply and load side

(c) DC on both supply and load side

(d) DC on the supply side and AC on the load side

The question was posed to me in exam.

My doubt stems from Single Phase VSI-1 in division Inverters of Power Electronics

Answer 1

The correct choice is (b) AC on both supply and load side

The explanation: Line-commuted inverters are actually phase-controlled converters operated in the inverting mode. They cannot act as standalone inverters as they require a AC supply. It is to be noted that “line commutated inverter” is not the conventional inverter. The conventional inverters are forced or load commutated inverters.