Re: [TCML] VTTC-tuning. John got me started ;-)

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Hi Bart,
No I don't think so.
It doesn't depend on the temperature of the day,humidity,radius of curvature etc.
If you consider it more it is not the formula for the prediction.
It is formula for calculation if you know secondary base current (or given the current).
That's the voltage developed across inductor.
The only unknown thing is "L" which varies from design to design and size of topload.

Dex

--- bartb@xxxxxxxxxxxxxxxx wrote:

From: bartb <bartb@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Thu, 02 Apr 2009 19:02:36 -0700

Hi Dex,

Dex Dexter wrote:
> 3.Is this a good formula to roughly estimate top volts:
>
> 0.5*L*di/dt < V < L*di/dt
>
> where i denotes secondary base current ,L low frequency secondary inductance,t time.

When considering top volts, it is certainly a "rough" estimate. A 
calculation can tell you about where you would expect the top volts to 
"top out at". But the temperature of the day, humidity, radius of 
curvature of the top terminal, preceding ionization, etc.. will 
determine the actual breakout voltage and it can be drastically 
different than the calc. But yes, if you look at the peak base current 
(which is much higher than the average base current) and look at the 
current over time, you can calc the value at which the top load will 
attempt to charge to. But, in reality, it will likely break out at a 
lower voltage based on the misc. conditions described earlier.

Personally for a top-volt guess, I use Vpri x sqrt(Cpri/Cee) * 0.7 and 
Cee comes from Javatc since Javatc has the ability to equate the energy 
storage capacitance (that moment in the cycle when all the energy is 
stored in the capacitance of the top load).

Take care,
Bart
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