Re: [TCML] SSTC Coupling

[Greg Morris <gbmorris@xxxxxxxxx>]

Have you guys ever heard of the Warrington formula? Rw = k/I^n * L, where n
and k are empirical constants, approximately 1.4 and 28688.5 resp. (for use
with meters, not feet).

Anyhow, I revised my circuit, and this is the result:
http://picasaweb.google.com/GBMorris/Tesla#5397805754928737186 It seems
correct to my knowledge, but the results are a bit disappointing. If
Tilbury's circuits are all wrong, where did he get them from and why did he
use them?

Cheers,
Greg



2009/10/27 Steve Ward <steve.ward@xxxxxxxxx>

> Dex, do you have a better 'Rspark'???
>
> Terry Fritz tried to characterize the corona impedance on a CW - SSTC at
> one
> point, but i dont recall if he determined it to be different than the 220k
> that he characterized for disruptive sparks.  Recently ive worked on
> non-linear spark models that give much better results in my DRSSTC
> simulations... i may open a discussion on this once i get a better feel for
> what im doing and get more measurements on a real system for direct
> comparison.  But really, there seems to be good evidence that would suggest
> the impedance of a spark will change with the voltage, generally the
> impedance will go down as the voltage applied to it goes up.
>
> I think Greg is probably more interested in gaining insight to the behavior
> of these systems, whether or not the figures are absolutely correct.  You
> can still learn from simulation and variation of parameters even if your
> parameters are "wrong".
>
> Steve
>
> On Tue, Oct 27, 2009 at 2:08 PM, Dex Dexter <dexterlabs@xxxxxxxxxxx>
> wrote:
>
> > Why do you think  Rspark = 220 kOhm is a realistic figure for SSTC ?
> >
> > Dex
> >
> >
> > --- gbmorris@xxxxxxxxx wrote:
> >
> > From: Greg Morris <gbmorris@xxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Subject: Re: [TCML] SSTC Coupling
> > Date: Mon, 26 Oct 2009 19:43:43 -0300
> >
> > So in other words my C_TERM should be shorted, and C_TERM_TO_GND should
> > have
> > the value of the current C_TERM?
> >
> > Thanks,
> > Greg
> >
> > 2009/10/26 Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx>
> >
> > > Greg Morris wrote:
> > >
> > >> My circuit
> > >> model can be found here,
> > >> http://picasaweb.google.com/GBMorris/Tesla#5396152968071832514 , and
> > has
> > >> been largely borrowed from Figure 8-1 of Tilbury's book on Tesla Coil
> > >> Design.
> > >>
> > >>
> > > The terminal capacitance should be in parallel with the secondary
> > > capacitance, not in series, with the load connected to both.
> > >
> > > Antonio Carlos M. de Queiroz
> > >
> > >
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> >
> >
> >
> > --
> > Greg Weyrich Morris
> > VP External - Engineering Undergraduate Society
> > B.Sc. Electrical Engineering (Final Year)
> > University of New Brunswick
> > G.B.Morris@xxxxxx
> > www.unb.ca/robotics
> >
> >
> >
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-- 
Greg Weyrich Morris
VP External - Engineering Undergraduate Society
B.Sc. Electrical Engineering (Final Year)
University of New Brunswick
G.B.Morris@xxxxxx
www.unb.ca/robotics
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