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[TCML] protecting IGBT



Hi,
I have built a large OLTC using two 1700v 1800Amp bricks in parallel.
(they will see around 1200v under normal running)...
Can you suggest a good way to protect them from over voltage?
The Gates have zeners accross them, but was thinking about putting some Transient voltage suppressors accross the drain/source, but not sure what ratings I would need...
Maybe a snubber capacitor??

Any recomendations?

Thanks,

carlos
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