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Re: LTR vs. STR for pigs was Re: PFC Question

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

This seems like a good time to find out some specs on the really huge coils
out there, especially tank cap, and SG design. I have in mind Big Bruiser,
Cauac, of cource Electrum, and Gregs 40KW coil, KVA effects coils etc. Maybe
we could put together a spreadsheet or something.


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, November 09, 2005 4:30 PM
Subject: LTR vs. STR for pigs was Re: PFC Question


> Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>
> Hi all,
>
> This debate got me thinking and I thought of a few
> things I'd like to bring up.
>
> 1) What decides whether a cap is LTR or STR? The
> answer is the leakage inductance of the transformer.
> Now in a NST that is built in, but a pig has
> practically none so you need to provide your own
> external ballast. So, it is not the pig itself that
> determines whether the cap is LTR or STR, but the
> ballast. (And the transformer turns ratio too, I
> suppose.)
>
> 2) Someone said that bang energies of 50J were out of
> the league of garage coilers. That was before the
> DRSSTC, which can generate bang energies several times
> bigger than the energy storage capacity of its tank
> cap. I believe Steve Ward's big DRSSTC must run about
> 50J bangs.
>
> I have got over 3kW at 200bps into mine which implies
> a bang size somewhat under 15J (allowing for about
> 15-20% losses.) I was using a 0.1uF @ 10kV tank cap,
> and since I was running about 400A peak at ~190kHz,
> the tank cap voltage would have been only 3.3kV and
> hence the stored energy would be less than 1J.
>
> I don't know how it does that, but it does. It seems
> the primary and secondary coils are now just a
> matching network that couples the inverter to the
> plasma load. The lower the Q of the matching network,
> the more efficient it is, and the less sensitive to
> streamer loading. I was reading an article on link
> coupled antenna tuners for ham radio and there seem to
> be a lot of similarities.
>
> Steve Conner
> http://www.scopeboy.com/
>
>
>