Re: New SSTC and topology in need of review

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Well Jimmy, im not entirely sure what i am going to gain, but i at least 
*think* it should be worthwhile.  Dan McCauley mentioned that his MOT SSTC 
(when working quite a while ago now) produced extremely long sparks.  Also, 
Dr. Gary Johnson has a large SSTC running 1700VDC into a half-bridge.. his 
coil makes some 54" sparks if i remember, though it IS powered from a PT.

Basically, my thought is that magnetizing current could be reduced a bit, 
and i can more easily get an impedance match that would give lots of power 
throughput without half of the current going to Imag.  With my 170V SSTCs 
ive gotten down to 5 turn primaries that are some 8" tall.  Very tight 
coupling and very few turns.  But, each turn taken off makes the current 
input skyrocket but does very little to increase spark length.  It just 
SEEMS that you need higher voltages.  As to how high, i dont know, but 
1400V seemed like a *fun* place to begin.

I must also note how my half-bridge flyback driver reacts with low 
voltage/high current (few primary turns) power supplies and high 
voltage/low current (many primary turns).  At low voltages the flyback has 
several resonant frequencies and makes decent sparks (with some 
heating).  But, at 120V input, i get disasterously long sparks but only 1 
Fres, and with no heating of components at all.  I know we are talking 
about 2 completely different things here, but i dont see why this concept 
would not hold up with SSTCs.

Steve Ward




>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: New SSTC and topology in need of review
>Date: Sun, 14 Dec 2003 10:53:49 -0700
>
>Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com>
>
>Hi,
>
>I remember seeing that circuit too, and thought it was pretty cool. What 
>do you expect to gain
>from a higher input voltage? The only thing I can see is the increased 
>number of primary turns
>needed for an impedance match. Unless you are using 1 turn on normal 
>SSTCs, I don't see the
>benefit.
>
>--- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
> >
> > Hi everyone,
> >
> > I have been working out my latest SSTC designed in the hopes that higher
> > voltage across the primary coil will work better than typical low voltages
> > of some 170-340V.  This new design should be able to produce about 1400V
> > across the primary in a very unique way:
> >
> > http://www.hot-streamer-dot-com/srward16/SSSSTC.htm
> >
> > Ive been studying this topology for a long time now and im in the process
> > of building this thing because i just have to see it for myself.
>Basically
> > i would like for you guys to analyze this topology and give me some
> > feedback on potential problems/benefits i may see.  I look forward to what
> > the solid state experts say.  Maybe this will lead to a new avenue in solid
> > state tesla coiling... though i have a feeling many would not like to
> > reproduce a 16 fet design (or 32 fets if things go well :O).
> >
> > So lets hear it! what do you all think?
> >
> > Thanks,
> >
> > Steve Ward
> >
> >
>
>
>=====
>Jimmy
>