Definition of latching and commutation devices
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The diode is an uncontrolled device, and is capable on conducting current in one direction only. With power electronics it is used as a rectifier, or as a protection device with switching circuits. The circuit symbol and characteristics are:
In practice we need to consider the turn-on and turn-off characteristics. A diode has two states
Conducting
Blocking
A finite time is required to go between these states, hence, tfr, forward recovery time and trr, reverse recovery time, need to be considered, if the theoretical characteristics and compare with the practical, the influence of these times can be appreciated
As the magnitude of the reverse current spike is dependant on the supply conditions and the value of trr. The presence of the reverse current spike can cause damage to other devices, hence it is normal to use a Fast Recover Diode, with a short trr in power electronic applications.
In practice we need to consider the turn-on and turn-off characteristics. A diode has two states
Conducting
Blocking
A finite time is required to go between these states, hence, tfr, forward recovery time and trr, reverse recovery time, need to be considered, if the theoretical characteristics and compare with the practical, the influence of these times can be appreciated
As the magnitude of the reverse current spike is dependant on the supply conditions and the value of trr. The presence of the reverse current spike can cause damage to other devices, hence it is normal to use a Fast Recover Diode, with a short trr in power electronic applications.
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