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Re: [TCML] protecting IGBT

Last time I build a brick OLTC, I had (at least) 4 x 1.2Kw 400v Transorb
TVS in series parallel across D &S and a fast diode into a bundle of
0.47uF caps (I think I nicked this idea from Steve Connor, but I can't
find a reference to it on his site.)

    It is well worth a look at http://scopeboy.com/tesla/t4proposal.html
as his OLTC was one of the biggest ever built (at the time) and very
well documented.

Or take a look at my smaller brick OLTC
http://www.extremeelectronics.co.uk/coils/oltc-2 and diagram at

On 09/06/2014 20:13, lightningfor@xxxxxxxxxxxxxxxxxxxxxx wrote:
> 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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