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Dead time is inserted between the switching of the two devices in an inverter leg to

  • A.prevent both from conducting at once
  • B.allow the load current to fall to zero between transitions
  • C.give the gate drive time to charge its power supply
  • D.reduce the switching frequency of the inverter

Answer: A

If the incoming device turned on before the outgoing one had turned off, the link would be short-circuited through both of them. A microsecond or two of overlap protection is enough, and it is set from the devices' turn-off times.

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