Question

For a three phase full controlled converter, with 3 thyristors in the upper or positive group and 3 thyristors in the lower or negative group, at any given time

(a) two thyristors are conducting from each group

(b) one thyristor is conducting from each group

(c) one thyristor is conducting from either of the groups

(d) all 6 thyristors are conducting at a time

This question was posed to me in an online quiz.

I want to ask this question from Three Phase Converters-2 topic in division Converters of Power Electronics

Answer 1

The correct answer is (b) one thyristor is conducting from each group

To explain I would say: Let’s say T1, T3 and T5 belong to the positive group and T2, T4 and T6 to the negative group. At any given time one SCR from each group conducts. e.g. T1 and T6 or T1 and T2.