Re: Continuous Wave Drive

To: tesla-at-pupman-dot-com
Subject: Re: Continuous Wave Drive
From: "Alex Crow" <user-at-alexcrow.clara-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Thu, 02 Mar 2000 17:06:19 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi all,

This is an old message, but I suddenly had a thought - wouldn't a
solid-state driven magnifier coil be a good proposition - ie the 'driver'
coil driven by a full-bridge bunch of MOSTFETs? The low impedance of the
driver coil would seem a good match (1) at the primary side for the
h-bridge (2) at the secondary side for the third resonator's base. This way
you avoid the saturation and non-linearity problems inherent in
Ferrite-cored transformers, and get a good match to boot (if everything is
designed well). Howver what I can't think is whether to discard the primary
caps and just drive the primary untuned, or another idea is to drive the
primary with an MMC in series with it, thus pumping the max. current into
the load - which is then seen as a series-tuned circuit, low Z at resonance
and developing really high voltages as the primary sees things (ie as a
parallel circuit).

Feel free to shoot this down if you think it's either impossible or
*monetarily* ridiculous (ie boxfuls of fried FETs!)

Alex Crow

Tesla List wrote:

> Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz>
>
> Hi Nick,
>
> > Original Poster: NickandSim-at-aol-dot-com
> >
> > Hi All,
> >           A while back I discussed the primary of my next system with
> >           you.  I
> > have decide to bite that bullet in the short term and build a flat
> > spiral primary.  However I have started the design process for a new
> > system, based around the secondary of my current system.  My aim is to
> > use a solid state system to drive about 100kV continuous wave into the
> > base of the secondary.  If I wish to use solid state drive it is
> > inevitable that I will have to use an output transformer.  I envisage
> > the drive voltage being about 500V at 13A RMS.  My main questions are:
> > What wave shape should I use to drive the coil? How should the output
> > transformer be constructed - like a ruhmkoff induction coil (but
> > without the iron core) or something else?
> >
> That sounds pretty ambitious. 100kV sinewave into a base
> impedance of a hundred ohms or so is equivalent to a source
> current of 1000 Amps.
>
> Regards,
> Malcolm