Topic: Power Electronics
In a chopper circuit, the thyristor is switched OFF at regular intervals by adopting
- A. Natural commutation
- B. Forced commutation
- C. Either natural or forced commutation
- D. A combination of natural and forced commutation
Answer: B. Forced commutation
Explanation: A chopper operates from a DC supply. Because the DC supply does not go through zero naturally (unlike AC), a thyristor used as a switch in a chopper circuit will not turn off on its own. It requires an external circuit to force the current to zero to turn it off, a process known as forced commutation.