Avoiding short circuit across DC bus & undefined AC output voltage condition

Q.  In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that
- Published on 08 Sep 15

a. Top switch of each leg is on at any instant
b. Bottom switch of each leg is on at any instant
c. Either (a) or (b)
d. None of these

ANSWER: Either (a) or (b)

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