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Generators and switch mode power supplies.

R

Rich Grise

Jan 1, 1970
0
It's an equity issue. Why should consumers who don't use high power SMPS
(mainly in computers) subsidise those who do?

Don't the power companies have something like a power factor/harmonics
surcharge? It seems that would be the sensible thing to do, which is
probably why the bureaucrats can't grasp the concept.

Thanks,
Rich
 
R

Richard The Dreaded Libertarian

Jan 1, 1970
0
Like things that don't catch fire? Like cars with turn signals? Like
grounded appliances? Like UL-tested outlets? Like safe and efective
drugs?

Apparently, the majority of the sheeple are too lazy/stupid to not burn
their own house down without some nanny state lording it over them.

Thanks,
Rich
 
J

JosephKK

Jan 1, 1970
0
It's an equity issue. Why should consumers who don't use high power SMPS
(mainly in computers) subsidise those who do?

Sylvia.

It goes way beyond PCs, what about the current waveforms of your CFLs?
How about all your wall warts feeding electronics? How about the TVs,
stereos, microwave ovens and other such stuff? Most of these have
very high harmonic content. Of course most motor loads do not have
harmonics but have bad power factors.
 
P

Phil Allison

Jan 1, 1970
0
"JosephKK"
It goes way beyond PCs, what about the current waveforms of your CFLs?
How about all your wall warts feeding electronics? How about the TVs,
stereos, microwave ovens and other such stuff? Most of these have
very high harmonic content.


** Errr - not true of most microwave ovens.

Obviously you have never checked the current draw of one.




..... Phil
 
S

Sylvia Else

Jan 1, 1970
0
JosephKK said:
It goes way beyond PCs, what about the current waveforms of your CFLs?
How about all your wall warts feeding electronics? How about the TVs,
stereos, microwave ovens and other such stuff? Most of these have
very high harmonic content. Of course most motor loads do not have
harmonics but have bad power factors.

CFLs are certainly going to become more of a problem, particularly if no
legal regulation is in place to limit their harmonic components, and
especially in Australia where incandescents are about to be banned from
import (none are made locally, apparently).

TVs and stereos don't use so much power, and accordingly represent a
lower harmonic load (though with the trend to widescreen plasma TVs that
is perhaps no longer true).

Motors have always been a problem, but it may be one that's cheaper to
solve within the infrastructure than within the individual loads, and
everyone uses motors.

Sylvia.
 
S

Sylvia Else

Jan 1, 1970
0
JosephKK said:
May not have happened yet down there, but has been around for about 2
decades in the US now.

I came across this

http://www.enhanceusa.com/designguide/atx12v_v2.0.pdf

which doesn't mention any US requirements, but does refer to some
European and Japanese ones.

This document gives details from EN 61000-3-2.

http://www.reo.co.uk/files/handbook_en_61000-3-2.pdf

The class D limit of 3.4mA/W for the third harmonic means 1.7A for a
500W (input) PS, which would be drawing only just over 2A at the
fundamental.

Doesn't seem an exactly onerous requirement. Indeed, I'd have to wonder
what an uncorrected 500W SMPS would be drawing. Have lobbyists managed
to get the standard set so that manufacturers actually had to do nothing?

Sylvia.
 
J

JosephKK

Jan 1, 1970
0
I came across this

http://www.enhanceusa.com/designguide/atx12v_v2.0.pdf

which doesn't mention any US requirements, but does refer to some
European and Japanese ones.

This document gives details from EN 61000-3-2.

http://www.reo.co.uk/files/handbook_en_61000-3-2.pdf

The class D limit of 3.4mA/W for the third harmonic means 1.7A for a
500W (input) PS, which would be drawing only just over 2A at the
fundamental.

Doesn't seem an exactly onerous requirement. Indeed, I'd have to wonder
what an uncorrected 500W SMPS would be drawing. Have lobbyists managed
to get the standard set so that manufacturers actually had to do nothing?

Sylvia.

It certainly looks like they did, at least partially:

http://www.epsma.org/pdf/PFC Guide_April 2005.pdf

http://archive.evaluationengineering.com/archive/articles/0900deal.htm

All on the first page of results of a search for:

en_61000-3-2.
 
Y

YD

Jan 1, 1970
0
Late at night, by candle light, Richard The Dreaded Libertarian
If the idea was any good, you wouldn't have to impose it by force of arms.

Thanks,
Rich

It adds cost to the final product, and manufacturers omit anything
they can get away with for a better margin.

- YD.
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