Brian,
When I worked for a well-known instrumentation company our universal power
line requirement was, if I remember correctly, 80 to 270 VAC. If one could
achieve more it was good. I designed one that would reliably operate from 75
to 280 VAC. This covered 100 V Japan on up with margin. Our products were
sometimes used in the field with generators and I believe the extra margin
built in helped us avoid field complaints. Our off-line bulk capacitance, as
well as the DC output capacitance was unusually large to allow for long line
dropouts.
Of course building in extra margin can raise the cost of design and
manufacturing. In our case it was reflected in higher capacitor cost and
lower power density. The upside was a slow but steady improvement in our
reputation and the ability to continue to command a price premium for our
products.
Dave Cuthbert
Senior Test Engineer
NARTE Certified EMC Engineer
Linear Technology Corporation
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From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Kunde, Brian
Sent: Wednesday, November 08, 2006 7:15 AM
To: emc-p...@ieee.org
Subject: Worst Case AC Power Conditions
Greetings,
1. Can anyone provide specifications for a "worst case" real world AC
power line condition in which an apparatus is expected to operate
properly in (pass/criteria A)? This would encompass a combination of
harmonics, voltage variations, frequency variations, etc..
2. Also, if anyone has a program for a California Instrument CTS
system with a 5000ix power supply that could test for a "worst case" AC
line condition, that would be helpful. I have heard that some companies
have developed such a custom program to simulate poor power conditions
>from different parts of the world. Such a program would operate with the
the provided CIgui32 program.
3. Can anyone recommend an AC Power Line analyzer that we can just
plug-in and it will analyze the AC power conditions at different
customer locations? Then we could take the results and program our
5000ix power supply to simulate those conditions in our lab.
The reason I'm asking is that from time to time we have experienced
problems in the field due to with poor AC power line conditions at some
customer locations even though we test and comply with the standard
tests that are required for CE (surge, burst, dips, etc). We want to
develop an internal test standard that will minimize problems in the
field.
Thank for any help or advice you can offer.
The Other Brian.
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