Re: [SURVPC] UPS the cause of problems?

[Constant Brouerius van Nidek]

On 1999-08-16 Bob Williams said:
 SU>In an off-list conversation with someone who  really seems to know
 SU>power supplies I was told that running a UPS or any other
 SU>"inverter" to supply an SMPS (switching mode power supply like in
 SU>most newer computers) is a risky thing.
What is meant by newer computers? My computer is an AT case (nice big and
roomy)power supply AT, mother board new with PentiumII 400mHz.
 SU>I can't find a copy.. but if I remember correctly it is a result
 SU>of the power curve.  If I get it right (and I'm not at ALL sure I
 SU>did) - because the SMPS is sampling the input voltage very fast -
 SU>and the input from the typical  non-sine wave UPS is not a true
 SU>sine wave,  there is the possibility for some MAJOR overshoot on
 SU>the SMPS ouput for short periods.  Short, but long enough to fry
 SU>something in the power supply.  This can account for not too
 SU>common but seemingly  unexplainable death of the SMPS in a
 SU>computer.  It seems to be something of a matter of probability and
 SU>timing.
<snip>
I have a very big stabilizer/transformer at hand, formerly used for and
airconditioning.  Could that be compared with an isolation transformer? The
only disadvantage is that the thing is not without noise because the iron
kernel plates (do not know the proper technical name) are vibrating
constantly and tightening the nuts and bolts did not improve anything.
<snip>
Would really like to see the experts on this topic enter the discussion ;-)

Law of Research: Enough research will tend to support your theory.

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