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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
I remember a discussion on pupman set off by a measurement of Steve Ward, where he could not reconcile the secondary base current with the top voltages, which he obtained differently. I believe the reasons for that are just these problems.
I'll restate the confusion for anyone who cares: if you assume your secondary has some Zo thats calculated by Zo = 2*pi*f*Lsec, and then try to calculate the top voltage based on Vtop = Ibase*Zo, then you can arrive at the wrong answer (it predicts a voltage too high). Why? Well because i broke down the circuit of a TC too far by assuming it was just some HF current going through a single coil of wire at some frequency. A better answer must account for the existance of the primary, and the fact that my setup was running at the upper pole frequency, which meanse Lsec should have some correction factor applied which makes it look much smaller (hey, after all, it IS ringing at a higher frequency than is "natural").
"Transient" arcs modeled well with 80k+15p for about 40" max arc length even but they are highly branched sparks.
Looks like i had some bogus memory, i just retried my simulations and i find the streamer needs to be ~50k + 5p (series) for my transient model of my system. 15p drags the voltage and current down too far unless the resistance drops sufficiently low (like in the QCW case, it seems to get down to ~20k +18p series). I should mention, these figures are for my small tesla coil gun, so the sparks are generated from the same driver/TC in both cases.
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An arc measurement