Power Electronics
Delay time is defined by the interval when

  all of these.
 anode voltage drops from 100 % to 90 % of its actual value.
 gate current increases from 90 % to 100 % of its final value.
 anode current reaches 10 % from forward leakage current.

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Power Electronics
During gate recovery time

 charge carriers of J3 junction is removed.
 charge carriers of J2 junction is swept out.
  charge carriers of J2 junction recombined.
 charge carrier of J1 junction removed.

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