Re: Sheppard-Talyor circuit up on my website/ low Z construction technique

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

Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>

rob wrote:
> 
> Tesla list wrote:
> >
> > Original poster: "Justin Hays by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <pyrotrons2000-at-yahoo-dot-com>
> >
> > Hi Rob and All,
> >
> > > I am finding that the FETs dissipate little wattage, but the FREDs
> > > get extremely hot.
> >
> > D26 and D25 are definately in the current path, they will see the
> > same amount current the MOSFET's are. I suppose D24 is getting pretty
> > hot? It will take the full current flowing in tranformer TX4's
> > primary.
> >
> > Ummm...IRG4PH50U is a 24A 1200V IGBT, good up to no more than 40kHz
> > (http://www.irf-dot-com/product-info/igbt/navigbt.pdf). No way this will
> > work at 240kHz but maybe you're only using those part #'s on the
> > schematic for simulation.
> 

I checked my site and it had the latest schematic.  Maybe you need to
hit the reload to get rid of an old cached copy.  I also added some
waveforms from the sims that demonstrate the diode dissipation problem. 
Rob.


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