Re: [TCML] Top volts with losses (formula bad)

[Steve Ward <steve.ward@xxxxxxxxx>]

Id be surprised if you could get a reasonably good analytic solution for a
wide range of coils.  If you assumed no output spark, its fairly easy (and
id imagine the solution you had was fine, but i didnt check it), but once
you get streamers, the impedance of the load is dynamic and non-linear, so i
see no solution other than numerical methods.

All of my various measurements of how sparks impact an operating system
still leave me in the dark.  Understanding the spark impedance vs Voltage
and time (i believe the time constants associated with spark production are
certainly on the time scale of a tesla coil RF envelope) seems to be quite
elusive.  This is probably the main reason i've stuck with this hobby for so
long.

Steve

On Wed, Feb 10, 2010 at 6:26 AM, Dex Dexter <dexterlabs@xxxxxxxxxxx> wrote:

> Formula is not good.Forget about it!
> It is useless even for values like Q1=Q2=20 and k=0.18.
> Well,I concentrated my investigations only to voltage
> magnitudes near the first notch times characteristic
> for loseless tesla coil.That was mistake.
> Max secondary voltage in typical tesla coil with
> heavier damping (and same k) usually occurs before
> that time...Damn.I don't know how I could miss
> something like that.
>
> :-(
>
> Dex
>
> --- dexterlabs@xxxxxxxxxxx wrote:
>
> From: "Dex Dexter" <dexterlabs@xxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Subject: [TCML] Top volts with losses
> Date: Tue, 9 Feb 2010 12:40:47 -0800
>
>
>
> I played a lot with PSPICE simuls  last few
> days and by aid of Wolfram's package Mathematica
> managed to find the following formula:
>
>
> http://i567.photobucket.com/albums/ss118/dexdex666/lossy_coil.jpg
>
> I don't know if formula like this one can be of any use
>  today in the age of powerful computer programs and stuff,
> but this wasn't my intention anyway.
> You have to know Q1 and Q2 in advance to make it useful
> (perhaps if you are in position to measure decay of
> current waveforms in primary and bottom of secondary that
> could provide Qs information).
> The main motivation for doing this was to find something
> relatively simple but accurate enough which could illustrate
> interlation between Qs and ks parameters in the specified range
> in the consideration of loss issues.
> Just wanted to shere this with you guys.
>
> Dex
>
>
>
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