Re: [TCML] SSTC Coupling

[Greg Morris <gbmorris@xxxxxxxxx>]

Hi Dex,

The plots I linked to are from a simulation done with ADS. They represent
the maximum RMS currents and voltages at the top of the secondary over a
frequency sweep of 65kHz - 250kHz. I can therefore not say with certainty
what the longest spark will be.

Cheers,
Greg

2009/10/25 Dex Dexter <dexterlabs@xxxxxxxxxxx>

> Hi Greg,
>
> Did you measure max peak current of the bottom of your secondary during
> best output operation?
>
> And what's the longest vertical spark lenght discharge to grounded targets
> you can get?
>
> Dex
>
> On Sat, Oct 24, 2009 at 8:19 AM, Greg Morris <gbmorris@xxxxxxxxx> wrote:
>
> > Hi Folks,
> >
> > I've been doing computer analysis of SSTCs and I've got some results that
> > seem to challenge the conventional wisdom of using the highest possible
> > coupling when building Solid State coils. The coil I am building is
> > required
> > to use less than 500 W of input power, so I was experimenting with
> current
> > limit resistors, and I noticed that depending on the value of the current
> > limit resistance, the coil output characteristics can vary tremendously.
> > With no limit resistor the output peaks when the coupling between the
> > primary and secondary is between about 0.7 and 0.95 (See
> > http://picasaweb.google.com/GBMorris/Tesla#5396152972495257298 ), but if
> > the
> > limiting resistance is 25 Ohm, the peak output is at the opposite end of
> > the
> > scale, between about 0.1 and 0.2! (See
> > http://picasaweb.google.com/GBMorris/Tesla#5396152972060592098 )
> > Increasing
> > the coupling significantly *decreases* the output in this case. 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.
> >
> > Cheers,
> > Greg
> >
> > --
> > 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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