Re: [TCML] tank circuit power

[Jeff Miller <jeffmill2@xxxxxxxxxxx>]

Jim
Excellent explanation on the operation of the true tesla coil. I knew most were not air coupled but could not come up with the right way to explain how they WERE coupled .
You know your stuff.

Thanks ,JM

On May 19, 2012, at 10:50 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 5/19/12 7:48 AM, mddeming@xxxxxxx wrote:
>> 
>> For the same diameter material and input power level, short primaries tend to heat up faster than longer ones.
>> This is related to in-rush current at the start of each cap discharge.
>> 
>> Matt D.
>> 
> 
> 
> For the same resonant frequency, a short primary has lower inductance and more capacitance..
> 
> L*I^2/2 = C*V^2/2  or, I = sqrt(C/L)*V
> 
> Since the current (and heating) in the primary goes as the current, short primaries get hotter.
> 
> There's sort of a optimization process.. bigger C means more stored energy for constant transformer voltage, which means more power, which means longer sparks, but at some point the increased I^2*R losses in the smaller primary eat up the gains.
> 
> 
> WHen you go to designs that are more CW.. SSTC and VTTC have different designs.. They're more air core transformers with a resonant secondary than two coupled resonators.  That is, the "oscillation" is driven externally, rather than by the ringing discharge of a LC circuit.
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