When a diode is switching from conducting state to blocking state, it has stored charge which needs to be discharged before, it blocks reverse current, this time required is known as _______.

This question was previously asked in
RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 3)
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  1. Forward Recovery Time
  2. Reverse Recovery Time
  3. Forward Conduction time
  4. Reverse Conduction Time

Answer (Detailed Solution Below)

Option 2 : Reverse Recovery Time
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Concept:

  • The recovery time of a diode is a time interval in which the diode changes its states from forward bias to reverse bias and vice-versa.
  • For a high-frequency signal, the recovery time should be as small as possible so that the diode can rectify the signal smoothly to maintain a proper switching operation.
  • Since high-frequency signals have a low time period, the recovery time of a diode must be small.
  • Hence, the switching frequency of a diode depends on reverse recovery time.

Additional Information

F2 Shubham 21-9-2020 Swati D 2

Where, IF = forward current during the positive half of V

IR = Reverse current during the negative half of V

F2 Shubham 21-9-2020 Swati D 3

Where, tr = recovery time

ts = storage time

tt = transient time

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