On Tuesday 21 May 2013 17:12:44 Peter C. Wallace did opine:
> On Tue, 21 May 2013, Jon Elson wrote:
> > Date: Tue, 21 May 2013 12:07:44 -0500
> > From: Jon Elson <[email protected]>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > <[email protected]>
> >
> > To: "Enhanced Machine Controller (EMC)"
> > <[email protected]> Subject: Re: [Emc-users] Superglue,
> > or Loc-tite for that motors flywheel?
> >
> > Peter C. Wallace wrote:
> >> PS: we blew a couple 75A 1200V Darlintons trying to make a constant
> >> current dynanometer load, so the lesson about secondary breakdown (or
> >> FBSOA) kinda sticks with me :-)
> >
> > I had a fantastic chat with an IR engineer about the characteristics
> > of IGBTs.
> > He said to never let them operate in the linear region, even for
> > sub-us periods. The positive temp coefficient of the basic element
> > in the linear region will cause current hogging to the center of the
> > die, and so just the center elements will be conducting all the
> > current until full saturation occurs. This will destroy the device
> > very quickly, sometimes within a few microseconds!
> >
> > Jon
>
> Interestingly SiC BJTs seem relatively immune to secondary breakdown
> (positive temperature coefficient of resistivity vs Si's negative)
> This also means they parallel well.
>
Si Carbide? I wasn't aware that anyone was using those for more than lab
curiosity.
In production AND affordable?
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
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Cheers, Gene
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