Hi,
At 11:05 PM 8/8/2006, you wrote:
Hi Gerry,
You are, of course, mathematically correct. I was attempting to
come up with an easy to visualize, intuitive explanation for
someone who is enthusiastic, but to whom the math and theory seem
to still be somewhat of an amorphous cloud. IMO, Ipeak = Vfire /
sqrt (Lp/Cp) is anything but visual or intuitive, but it certainly
IS accurate as long as R ~ 0.
Matt D.
For some strange reason, when I wrote up the Tesla coil formulas thing I used:
Ipeak = Vfire / sqrt (Lp/Cp)
Instead of the more proper form:
Ipeak = Vfire x sqrt (Cp/Lp)
That was corrected a while back:
http://hot-streamer.com/temp/FormulasForTeslaCoils.pdf
In the case of the SISG, primary resistance is very important since
we are using giant primary caps, small value primary coils, low voltage etc.
So the equation then becomes:
Iprimary = Vfire x SQRT(Cp/Lp) x EXP(-R x t / (2 x Lp) x SIN(t /
SQRT(Lp x Cp))
That equation is used to find primary resistance buy comparing to
digital scope captures too.
http://drsstc.com/~sisg/files/BigSISGCoil/Qcalc.pdf
I suppose one could take the differential and find the first zero
slope point for a closed form for peak current with
resistance.... But that would make my brain hurt ;-))
I am sure you wanted to know all that :o)))
Cheers,
Terry