Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
  anode current rises from 90 % to its final value.
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.

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Power Electronics
During gate recovery time

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

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