IGBT emitter to gate diode

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J

J.Carlos

Member
Joined 2003
Hello all,

I just ran across a smps that implements a half bridge topology with IGBTs, unusually (for me) I found a schottky diode connected from emitter to gate (via Rg resitor) of each transistor.

photo_hotlink.php


I seem to fail to understand what is this for, I know zener diodes connected directly from the emitter to gate protects from overvoltages.

Any hints??
 
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