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From: email@example.com (Bill Allison)
Subject: Re: Help - Power mosfets - difficult load
Date: 25 Oct 2002 02:51:45 -0700
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3DB81206.E28CA99F@rica.net>
NNTP-Posting-Date: 25 Oct 2002 09:51:46 GMT
John Popelish wrote in message news:<3DB81206.E28CA99F@rica.net>...
> Bill Allison wrote:
> > To all - this has generated such interest and controversy that I feel
> > obliged, once construction is complete and assuming (!!??) success, to
> > post oscillograms somewhere (somebody suggest where?) to quantify just
> > how much of a problem operating at 50Hz turned out to be. So keep an
> > eye open for this thread re-awakening in a few weeks.
> A good group for binary files like this would be
> alt.binaries.schematics.electronic which is monitored by many that
> post to this one.
> I would be interested in your scope shots and also the schematic of
> the circuit that produced them.
Thanks John and will do. It will be an interesting exercise in itself
- I've never tried photographing from the scope screen!
Given that I *am* making life difficult for myself by driving the
motor with relatively low frequency pulses, a further use of scope
traces beyond assessing power dissipation in the fets will, I imagine,
be to observe and attempt to minimise, the amplitude of voltage
transients across the fet.
Would I be correct in thinking that in addition to the Schottkys and
attention to short stout wiring to minimise inductance, there may be
some scope for further tuning out of fast spikes e.g. by judicious
application of RC snubbers?
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