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Desaturation in IGBT : what does it really mean?

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pawan kumar

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Hi Friends,

Somehow, i do not understand this word completely. I came across "Desaturation" in IGBT because of a circuit which was a 3Phase AC motor driver.

There's a block which senses that the IGBT is coming close to Desaturation and prevents it through a slow stop signal at it's Gate (Base).

They say that when this Desaturation occurs, there is an increase in the collector potential : Does that mean the transistor go into Active region? Please help me understand guys. Here is a schematic which I am referring to :

desaturation.JPG

Thanks,
Pawan
 

schmitt trigger

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Hi Friends,

They say that when this Desaturation occurs, there is an increase in the collector potential : Does that mean the transistor go into Active region? Please help me understand guys. Here is a schematic which I am referring to :
Thanks,
Pawan
That is correct.
And as you well know, in the active region the power dissipation increases dramatically.
 

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