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___________?
Correct answer: C. Either A. or B.
- 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
Explanation
Each inverter leg must always have exactly one device conducting, with the upper and lower switches operated complementarily, including dead time. This prevents both switches in a leg from shorting the DC bus and avoids an undefined leg output.
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