Re: [TCML] tank circuit power

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

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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