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Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Mon, 23 Sep 2002 19:03:20 -0400
Organization: Posted via Supernews, http://www.supernews.com
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And therein lies the 'best evidence' - the dead bodies. We
don't know what failed. Therefore we have insufficient
evidence to know what was incoming current and what was the
outgoing current paths - two necessary conditions for damage.
For that matter, as Roy McCammon has suggested, we don't
know if damage and noise were related events or coincidences -
although they probably are related.
Harry Dellamano wrote:
> I agree with what you say but if it common mode energy, what will it
> affect in the SMPS? I see the Y caps smoking but after that what else? It
> will not pass a EMI conducted emissions test but it would still be
> operational. Will it cause the SMPS to grunt and groan? I think not.
> The OP statement "one device which failed was an online UPS which I'd been
> using to protect the PC downstream, every high-speed switching component in
> it had been fried" is very suspicious. Maybe he is on a fishing expedition
> or just trolling. Sorry Peter G. but I had to say that. Can we get some
> digital pics of the destruction?
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