Question

In the below shown semi-converter circuit T1 & T2 are fired at an angle α, the output voltage is zero when

(a) π<ωt<α

(b) 0<ωt<α+π

(c) π<ωt<π+α

(d) π<ωt<2π

The question was asked in final exam.

My question comes from Single Phase Semi-Converters-1 in division Converters of Power Electronics

Answer 1

Right option is (c) π<ωt<π+α

For explanation I would say: FD is conducting as none of the SCRs are gated which S.C’s the load circuit hence zero voltage.