Re: New DRSSTC Benchmark

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:
> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
> Does this "multiplier" also apply to the SQR of the sec and pri 
> inductances? How large of a multiplier value are we talking about?
> Does this relate to autotransformer action or some other mechanism?

Yes. For excitation between the resonances, squared sinusoid input
and the primary and secondary circuits tuned so:
Lb/La = Ca(1-k^2)/Cb  (1)
The ideal voltage gain for square wave input is:
(8/(k Pi)) sqrt(Lb/La) (2)
Assuming low losses, of course. The voltage gain is inversely
proportional to the coupling coefficient.
La, Ca = primary; Lb, Cb = secondary.
For excitation at the resonances, the gain depends on how long
the driver operates, and for the same number of cycles the gain
is lower and the input current higher.

> I have usually used Vi x 70% x SQR (Ls/Lp) which seems to relate 
> very close to measuring the peak potential on an o-scope and firing 
> the pri once every 10 seconds through a diode-resistive charger 
> (around 10 meg).  I calibrate the scopes small metal metal plate 
> pickup (2 x 2 in) by using a 200 kV DC power supply on the 
> toroid.  This gives me a reference signal level to compare the peak 
> TC potential out to (waveform is of course independent of peak 
> potential --- HV Engineering, 2nd ed. Naidu & Kamaraju).

You can probably use the same technique, with the 70% of (1) to
account for some losses and nonlinear voltage profile along the
secondary.

Antonio Carlos M. de Queiroz