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A thyristor is turned off by

  • A.reducing its current below the holding value
  • B.removing the gate signal applied to it
  • C.reversing the polarity of the gate signal applied to it
  • D.raising its junction temperature above a threshold

Answer: A

Once latched, a thyristor ignores its gate entirely, so the main circuit must bring the current to zero and hold the device reverse biased for its turn-off time. That property is what makes line-commutated converters natural and forced-commutated ones complicated.

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