Re: High-input SSTC: Possible?

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

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Matt,

VRRM - Reverse Recovery Voltage Maximum; maximum repetitive reverse
voltage a diode or SCR  can survive.  Design robustness dictates derating
from this value (50% is common).

Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA

Tesla list wrote:

> Original poster: "Matthew Smith by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>
>
> Hi Terry, All
>
> I checked the Farnell catalogue for IGBT prices and after the medical
> team had resuscitated me... :-)  Yes, they are pretty expensive, but
> definitely ones to watch (whilst the price falls); I *like* the idea of
> the fibre optic (total electrical isolation) linkage between modules; I
> also like the idea of getting more of the input power into the T-coil
> rather than providing a sound and light show from the spark gap.
>
> Think I'll go to the LV-fed FET idea (a la Carl Willis) for now, but
> once those IGBT's are within reach of my pockets, look out world!
>
> A final question whilst we're on the semiconductor subject:  My
> catalogue rates diodes with a voltage RRM - what is this?  I was always
> taught that diodes were rated as a *peak* voltage, so when sizing a
> rectifier, we take the measured output voltage of the transformer and
> divide by 0.707 (or was it 0.704) to get the peak from the voltage (RMS)
> that we have measured...
>
> Cheers
>
> Matthew Smith
>
> Tesla list wrote:
> >
> > Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >
> > Hi Matthew,
> >
> > It certainly is possible!  I did a lot of work in this area a while back:
> >
>
> 8x----- SNIP
>
> >
> > Unfortunately, it is very expensive.  I estimated about $2000 on top of any
> > R&D setbacks.
>
> 8x----- SNIP
>
> >
> > Cheers,
> >
> >         Terry
> >
> > At 10:25 AM 12/23/2001 +1030, you wrote:
> > >Hi all
> > >
> > >Looking at various SSTC schematics, I see that we are generally
> > >switching about 120V; is it possible to use a stack of MOSFETs, or
> > >whatever, to work with a larger power source, eg., rectified MOT, to
> > >build an SSTC with a lot more "oomph"?
> > >
> > >Cheers
> > >
> > >Matthew Smith