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0.5*C*V*V vaild? (Was Output Voltages and Voltage/Length)


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From:  Greg Leyh [SMTP:lod-at-pacbell-dot-net]
Sent:  Sunday, February 08, 1998 6:00 PM
To:  Tesla List
Subject:  Re: 0.5*C*V*V vaild?  (Was Output Voltages and Voltage/Length)

Mark S. Rzeszotarski wrote:


>         I have done considerable modelling of tesla coils and helical
> resonators, examining the theoretical voltage rise under non-breakout
> conditions.  I have also built a series of tesla coils with back-to-back
> LED's placed every 2 inches along the length of the coil with various H/D
> configurations to examine the voltage rise in these rather heavily damped
> coil systems.  Several observations are notable:
> 1.  The voltage distribution goes from a minimum at the base to a maximum at
> the top when tuned to the quarter wavelength of the coil system, even in a
> damped coil system.
> 2.  Adding a toroid or sphere to the top tends to linearize the voltage rise
> somewhat, so that the turn-to-turn voltage stress is lessened especially
> near the top of the coil.

I have also noticed in PSPICE that the voltage dist 
along the sec becomes much more linear when a large
topload is added.
If the voltage dist along the sec is mostly linear, 
then is it reasonable to treat the sec ckt as lumped
elements, and forget the 'antenna theory' treatment?


-GL