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Forums
4hv.org :: Forums :: Tesla Coils
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SMALL OLTC

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Gregory
Mon Dec 20 2010, 04:12PM Print
Gregory Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
hey guys, i wanna make a small oltc only to survive the old times hehehe.

i'm think in use two irg4pc50ud in paralel in a primary only with two turns. each igbt with one turn. in real the primary will be one turn.

if i put 30v in this igbts can i make it run more than the manufature specification??
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Arcstarter
Tue Dec 21 2010, 12:25AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
You should be more specific with your questions for convenience to anyone who may be able to answer it, otherwise we might as well just overlook the thread and move on to the next one.

Anyhow, i am pretty sure i am correct in assuming you mean 30v on the gate. This IGBT has no zener's on the input, so it is relatively safe to run at 30v. If there where zeners, higher voltage would make them become reverse biased, in turn killing them and shorting the gate. You could likely fix that with a beefy low voltage transformer to blow the open, though.

The only problem with driving gates with higher voltage is gate oxidation, and worst case scenario, breakdown. But, seeing that IGBTs in Tesla coils are either short-lived, or just not used often/high duty cycle, it would be no problem.

What a coincidence, just a minute ago i figured i would make an OLTC because i have a few 200 amp 600v IGBTs that are much too slow for anything else (the datasheet suggests 1KHz max)! I'll let you know if i figure out anything useful, seeing that OLTC's never really caught on as well as other types. There is not much info on the net!
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Gregory
Tue Dec 21 2010, 01:33AM
Gregory Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Hey man, sorry, because i'm from brazil and my english isn't good.

I would be happy if we help us make an OLTC!

Do you have msn, facebook? we can talk about this there

I want use microwave capacitor, two IRG4PC50UD each with one turn of the primary. But i don't know what is the "best" secondary frequency. I read that is better less than 100khz to get a bigger bang of energy. What you know about this?
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