Question

In the below shown circuit, considering the load to be purely R load, the thyristor T2 would conduct from ωt =

(a) 0 to π

(b) α to π

(c) π+α to 2π

(d) π to 2π+α

The question was asked during an interview for a job.

Query is from Single Phase FW AC-DC-1 topic in division Converters of Power Electronics

Answer 1

Right choice is (c) π+α to 2π

To explain: The bottom winding forward biases the SCR T2 at π, conduction starts after the pulse is given at α & stops when T2 is naturally commutated at 2π.