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From: "Harry Dellamano"
Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Tue, 24 Sep 2002 07:40:01 -0700
Organization: Posted via Supernews, http://www.supernews.com
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Kevin McMurtrie" wrote in message
> In article <3D8F74CA.9DC367D8@usa.net>, w_tom wrote:
> > Summarizing important points as I understand them:
> >1) High frequency noise in SMPS is only when powered in your
> >house and not in any other house; both powered by same utility
> >transformer (and phase).
> >2) Using an oscilloscope in differential mode, electrical
> >source of that noise cannot be observed / detected.
> >3) Noise source is believed so strong as to damage every power
> >supply component.
> >Point 1 says the source of electrical noise is only in your
> >Microwaves, et al as the noise source in point 3 is not
> >reasonable. To damage electrical components, the noise energy
> >would not just damage resilient SM power supplies and not less
> >resilient dimmer switches, GFCI, electronic clocks, etc. To
> >have noise that high, another important household component
> >would also suffer damage - the human.
> It's true that most circuits can't see microwaves but even a few generic
> semiconductors can rectify in the GHz range. Radar is especially bad.
> The RMS power may be very low but the peak power is extremely high. I
> live near an airport and a few military bases. Radar interference with
> electronics isn't unusual. It sometimes hits my TV and completely jams
> it momemtarily. My previous car CD player skipped and blanked out
> frequently near airports.
> Microwaves entering a SMPS could bias the voltage feedback loop so it's
> no longer properly compensated. I would expect that modern motherboards
> would also contain microwave sensitive semiconductors and that exposed
> computers would crash more frequently. How reliable is your system,
But Peter is the only one in the hood getting these U-waves. Very strange.
Peter, if you hold up a fluorescent bulb will it light with no wires
attached? If it does then you have high power u-waves that can cause damage.
Now go next door with your magic stick and see if it will light over there.
Maybe more sleep would be appropriate.
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