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Desaturation detection in an IGBT gate drive protects against

  • A.a failure of the speed feedback device
  • B.a short circuit on the output of the inverter
  • C.an overvoltage on the dc link of the drive
  • D.an over-temperature of the heatsink assembly

Answer: B

A short circuit drives the device out of saturation and its collector voltage rises while it is supposed to be on, which the drive detects within a microsecond or two. It then turns the device off gently to avoid an overvoltage from the circuit inductance.

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