Question

In the below given type C chopper circuit, _______ and _________ together operate like type A chopper.

(a) CH1, FD

(b) CH2, FD

(c) CH1, D2

(d) CH2, D2

I had been asked this question during an interview.

This intriguing question originated from Type C Chopper in portion Choppers of Power Electronics

Answer 1

The correct option is (a) CH1, FD

To explain: In the above shown type C chopper circuit, when CH1 is on and current flows VS-CH1-L-E-Vs. When CH1 is switched off, current freewheels through the FD. Hence, current and voltage both are positive giving type A chopper operation.