Re: A 20 kV DC tank supply
> Original Poster: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
> to: Marco
> As long as you can recharge the caps fast enough your idea will work.
> Many times, with a straight AC supply, the recharge rate for full charge in
> the caps is not fast enough and the RSG fires at less than full charge.
> This produces the thinner streamer type sparks I was referring to. This is
> especially true for large systems running large caps. Still, you might
> have trouble with the diodes as Greg Leyh did during his initial testing.
I don't know to what trouble you are referring -- the diodes were
one of the most trouble free parts of the system! The rotary gap
was the biggest troublemaker, BY FAR. *None* of the diodes in
Electrum's resonant charger have ever failed during the operation
of the coil!
The only time I've ever lost a diode was during a test of the DC
power supply, where a wiring error caused 76kVAC to be accidentally
applied across a 50kV stack -- and even then only one stack out of
the six total was damaged. During normal operation of the resonant
charger the diodes perform to specification.
I should also point out that DC resonant chargers are the standard
method for charging caps in high rep-rate, high reliability applications
such as radars and even linear accelerators. There are 243 150kW class
DCRC's in service along the SLAC accelerator, and they run 24hr/day
at 180BPS. The resonant charger topology has been around longer than
I have, which makes it all the more interesting that no one else has
applied the concept to Tesla Coils (especially coilers named DC! :^)