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What is the value of voltage at the output terminal when the freewheeling diode (FD) is conducting?

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in Power Electronics by (27.1k points)
What is the value of voltage at the output terminal when the freewheeling diode (FD) is conducting?

(a) Zero

(b) Maximum

(c) E

(d) It could be anything depending on α

This question was posed to me during an online interview.

Asked question is from Three Phase Converters-3 topic in section Converters of Power Electronics

1 Answer

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by (45.1k points)
The correct option is (a) Zero

To elaborate: When FD is conducting it will short circuit the load terminal resulting in zero voltage. It won’t be E because the terminals are shorted. It can be E when none of the devices are conducting (This can happen only when α > 120°).

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