Re: The ISSTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

That was the red insulation on the ground wire.  The streamer was striking
the ground wire not the base.

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 12, 2004 9:53 AM
Subject: Re: The ISSTC


 > Original poster: Brett Miller <brmtesla2-at-yahoo-dot-com>
 >
 > Steve,
 >
 > Ok, that was just amazing!!!  I don't even know what
 > to say.  What was that intense red glow (in the second
 > video) when the arc made contact with your wooden
 > base?  Was it actually wood being vaporized, or a
 > reflection off the secondary?  It was hard to tell.
 > Your secondary diameter to arc length ratio is
 > phenominal.  Excellent work.
 >
 > -Brett
 >
 >
 >
 > --- Tesla list <tesla-at-pupman-dot-com> wrote:
 >  > Original poster: "Steven Ward"
 >  > <srward16-at-hotmail-dot-com>
 >  >
 >  > Hey everybody!
 >  >
 >  > Ive been holding out on the tesla list.  Anyway, i
 >  > "sorta" came up with a
 >  > new breed of SSTC (mucho thanks to Jimmy H.!!!).  Be
 >  > careful though, it
 >  > doesnt look like a SSTC:
 >  >
 >  > http://www.hot-streamer-dot-com/srward16/I_SSTCnew.htm
 >  >
 >  > I dont think any amount of explanation will answer
 >  > all questions, but i
 >  > will briefly explain whats going on.
 >  >
 >  > Basically its your normal H-bridge driven SSTC.  Now
 >  > to make it exciting,
 >  > we throw in a tank cap thats tuned to Fres with the
 >  > primary.  Now we have
 >  > very low surge Z, so we can pump insane amount of
 >  > power into the tank (my
 >  > coil is probably seeing about 500A peak at worst at
 >  > about 6kv on the
 >  > tank).  To handle the high currents we use good
 >  > IGBTs and drive the gates
 >  > at 30V to lower the Vce drop.  My MMC is made up of
 >  > 18 caps (.15 2kv) in 3
 >  > strings of 6 total (75nf 12kvDC).  The burst length
 >  > ( the time im driving
 >  > the tank ) is only 170uS with several mS inbetween
 >  > (depending on where i
 >  > set the bps).
 >  > The current draw can be as little as 4A (low BPS) or
 >  > as high as 10A
 >  > (screaming bps) at 240VAC input.  There is 3000uf of
 >  > filtering to supply
 >  > high current to the bridge on demand (i could use a
 >  > bit more filtering though).
 >  >
 >  > I lost a few IGBTs at 240V before i added TVS and
 >  > zeners on everything, now
 >  > it runs solid.
 >  >
 >  > I need to build a cage around the electronics, im
 >  > very lucky it didnt zap them!
 >  >
 >  > Enjoy!
 >  >
 >  > Steve Ward
 >  >
 >  >
 >
 >