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Number of switches turned on in 3-phase 120° VSI at a single time are __________(a) 2(b) 4(c) 5(d) 3This question was addressed to me in a national level competition.This intriguing question comes from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

Correct CHOICE is (d) 3

To explain I would say: In 3-phase 120° VSI each phase CONDUCTS for 120° and only THREE switches from DIFFERENT phases conduct at a single time.



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