Re: High Power SSTCs - Need help and opinions

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

Original poster: "Gavin Dingley" <gdingley-at-ukf-dot-net> 

Hi Dan,
to increase the current/voltage in the primary you could use resonance. If
you put a capacitor in parallel with the primary coil, you can reduce the
inductive reactance to a resistive surge impedance. If you put a capacitor
in series, the voltage across the primary will be magnified. Of course you
are then fixed to one frequency and the whole system would be similar to a
spark gap TC in set-up, i.e tuning and retuning to compensate for mutual
inductance ect.

Cheers,

Gavin


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, September 17, 2003 12:10 AM
Subject: High Power SSTCs - Need help and opinions


 > Original poster: "Mccauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com>
 >
 >
 > After doing a considerable amount of work with flea powered SSTCs such
 > as the PlasmaSonic SSTC and my high frequency
 > tweeter system (which is still ongoing), I'm ready to sit down and build
 > a monster SSTC capable of operating at many
 > kilowatts and hopefully put out huge, thick, and nasty output streamers.
 > I have a large budget allocated for this
 > winter project so if it takes $2000 worth of high performance FETs, so
 > be it.  But I want it to be nasty beast of a
 > SSTC.
 >
 > There are currently two routes which are both difficult in their own
 > regard.
 >
 > 1) Maximize output power utilizing maximum primary voltage waveforms
 >     (Primary difficulty is switching high voltage switch with solid state
 > devices)
 >
 > 2) Maximize output power utilizing maximum primary current waveforms
 >     (Difficulty in maximizing primary impedance and current handling
 > capabilities of solid state devices)
 >
 >
 > I would like to use option number 2 and maximize the primary current.  I
 > already believe Justin and Aaron have done
 > considerable work in this area.  My questions are:
 >
 > A.  There has to be some limit to the amount of turns one can place on
 > the primary when trying to lower the impedance
 > of the primary to maximize primary current.  Once this limit is reached,
 > what other alternatives are there for lowering
 > this impedance even more.
 >
 > B.  Will building a rather large primary / secondary coil system result
 > in even lower primary impedances???  Obviously, thicker wire will have a
 > lower impedance, but what about coupling between coils?
 >
 > Throw out any and all opinions, comments, you can.  I do want to build a
 > SSTC capable of 10kW+.  Its going to be a challenge (plethora of snubber
 > circuits, transmission line designed gate drivers, FDFI, etc...), but it
 > will be fun!
 >
 > Dan
 >
 >