RE: Self-Resonant SSTC topologies

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

Original poster: "David Trimmell" <humanb-at-chaoticuniverse-dot-com> 

Well, well, isn't it a fine evening! I just have sampled the pleasure of
double self resonant SSTC's, and haven't killed anything yet! And hey,
it isn't even resonant yet! I just through some series caps in and
wow!!! This   is some serious stuff, no kidding. I need to find a good
interrupt rate, etc., as so far I have just been guessing! Here is a
small M$ Media player video of some effects:

http://www.chaoticuniverse-dot-com/webdoc2.htg/SSTC/Pictures/Self_res_proto1
/DRSSTC1.wmv

Interesting thing to note, while testing I started to smell a burning
smell. Turned out one of my other TC's was resonating with this guy and
shorting with some wire touching it in my mess!

Thanks to Dan McCauley (I am using his half-bridge driver design) and to
Steve Ward for his ultra simple self resonant designs. By the way what
exactly was the prejudice in the past for using IGBT's?

These guys rock!

Regards,

David Trimmell



-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, May 13, 2004 3:21 PM
To: tesla-at-pupman-dot-com
Subject: Self-Resonant SSTC topologies

Original poster: humanb-at-chaoticuniverse-dot-com

Hello, I have a couple questions to the folks who have
used the "current feedback" methode of driving their
SSTC's. Does this provide a "self-starting" coil? While
using a antenna on my self res driver, I need to touch
it in order to get the thing started (no oscillator
IC). Schematics of the self-res ISSTC show no starter
circuitry, so I assume this to be the case. Also, is
phasing just a matter of changing the direction of the
RF ground loop?

I am using a half-bridge of the HGT1N30N60A4D IGBT's as
a test bed. While running without an interruptor
circuit I get 4-5 inch Hot CW plasma discharge (180
VDC) pulling 5 amps (panel meter) from the AC line into
filter. With a P-4 heatsink and fan everything runs
stone cold, even with 5-6 minute continuous runs. But
the coil does get nice and warm (4" wound with #28).
Seems that #28 wire may be on the thin side, at least
for a non-interrupted system.

For a Picture:
http://209.210.231.220/webdoc2.htg/SSTC/Pictures/Self_res_proto1/H-res_p
roto_lash7.jpg

Future work will include adding the Interrupter
circuit, and looking at adding the series res cap.
Also, what about a Magnifier version? With all those
primary to secondary flashovers, that would be a nice
solution, no? I allways wanted to make a VTTC Magi, but
never got around to it, hmm... Well, one step at a time!

Regards,

David Trimmell