Question

For a single phase thyristor circuit with R load & firing angle α, the conduction angle can be given by

(a) π+α

(b) 2π+α

(c) π-α

(d) α

I have been asked this question in an interview for job.

My enquiry is from Single-Phase HW AC-DC-1 in portion Converters of Power Electronics

Answer 1

Right option is (c) π-α

To elaborate: SCR is fired at α, hence it conducts from α till it is commutated by the reversal of the AC supply i.e at π radians.