Re: The ISSTC

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

Original poster: Liviu Vasiliu <teslina-at-yahoo-dot-com> 

This is a great result and it is demonstrating how far
can the things go starting from a little project
(miniSSTC of Steve), combining a few good ideas (full
bridge IGBTs, driver chips with ON/OFF enable,
resonant tuning with a cap for the primary coil).
Good work Steve!
SSTCs rule!

teslina
 >
 >
--- 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
 >
 >