RE: Self-Resonant SSTC topologies

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

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

Hi Dave,

 >From: "Tesla list" <tesla-at-pupman-dot-com>
 >To: tesla-at-pupman-dot-com
 >Subject: Self-Resonant SSTC topologies
 >Date: Thu, 13 May 2004 16:20:39 -0600
 >
 >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.

According to my charts, that is about 0.32mm Cu diameter. What is the
resonant frequency of the coil?

Thanks,
Malcolm