Re: SMPS MWO IGBT Salvage

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

can you tell what guage wire is used for the strands on the litz 
primary? Without a scope that can get you in the right city, but not 
sure about ballpark (eg: if it's 38 awg it's prob 50-100 kHz, thicker 
strands=lower freq.). You can also try to draw an arc and see if you 
can hear it whistle or not. Mostly silent = >20kHz. Not very 
accurate, but the tools are cheap.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, June 17, 2006 8:11 PM
Subject: Re: SMPS MWO IGBT Salvage


> Original poster: tesla <tesla@xxxxxxxxxxxxxxx>
>
> Greetings
>
> No data on that point despite review of net. Looked long and hard could find
> little of specific detail.  Noted diodes rectifying output of xfrmr have Trr
> of 0.1uS.  This provides some guide to max operating freq of the supply.
>
> The ferrite core in the inverter is small and this suggests to me an
> operating freq that is high.
>
> Other of more knowledge and experience may draw better conclusions than I
> can.
>
> Best
> Ted
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Sunday, June 18, 2006 11:34 AM
> Subject: Re: SMPS MWO IGBT Salvage
>
>
> > Original poster: <a1accounting@xxxxxxxxxxxxx>
> >
> > Hi Ted,
> > Nice find.
> > Does the SS power supply operate anywhere near a practical coil > 
> frequency?
> >
> > Bob
> >  >
> >  > From: "Tesla list" <tesla@xxxxxxxxxx>
> >  > Date: 2006/06/17 Sat PM 06:31:13 EDT
> >  > To: tesla@xxxxxxxxxx
> >  > Subject: SMPS MWO IGBT Salvage
> >  >
> >  > Original poster: tesla <tesla@xxxxxxxxxxxxxxx>
> >  >
> >  > Team
> >  >
> >  > Recently interecepted about 30 MWO's from the repair shop before they
> were
> >  > dumped.
> >  >
> >  > Two of these had a SMPS. As we all appreciate in time we can 
> expect > the
> >  > percentage of SMPS supplies from dumped MWO to rise to neart 100%
> >  >
> >  > A quick look on the net suggests the IGBT's 1000v 60A fast types > might
> be
> >  > useful in SISG or DRSSTC designs. Has anybody used  these as a source
> of
> >  > IGBT's for these circuits or knows these types have potential use for
> Teslas
> >  >
> >  > The IGBT's were Toshiba GT30J322 and I think (as it was not 
> labelled) > a
> >  > GT60N321
> >  >
> >  > Thanks
> >  > Ted L in NZ
> >  >
> >  >
> >  >
> >
> >
> >