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An IGBT differs from a thyristor in that it

  • A.conducts in both directions once it has been turned on
  • B.can be turned off by its gate
  • C.requires a much larger gate current to hold it on
  • D.cannot block voltage in the reverse direction at all

Answer: B

Gate-controlled turn-off is what makes pulse width modulation possible, since the device can be switched thousands of times a second at will. It is the reason the IGBT displaced the thyristor from almost all drive inverters.

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