Re: A 20 kV DC tank supply

Would you be so glad and give me some info about what diodes (or diode
network) you have been using, what kind of charging inductor and so on?
What DCRC means?

Thank you

tesla-at-pupman-dot-com on 13.12.98 19:01:31

To:   tesla-at-pupman-dot-com
cc:    (bcc: Marco Denicolai/MARTIS)
Subject:  Re: A 20 kV DC tank supply

Original Poster: Greg Leyh <lod-at-pacbell-dot-net>

> 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
> 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
> 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! :^)