Power Electronics
Delay time is defined by the interval when

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

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Power Electronics
Rise time is defined by the interval when

 gate current rises from 90 % to 100 % of it final value.
  both B and C.
 anode current rises 10 % to 90 % of its final value.
 anode voltage drops from 90 % to 10 % of its initial value.

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