John,
I was looking at my copy of 61000-3-2 to find the references you all are
making. My copy does not have a paragraph 6.2.3.3 for example. Then I
realized you are referring to EN 61000-3-2 : 2000. What I have is IEC
61000-3-2 : 2000.
Can anyone tell me that there is that big a difference
Neil,
If the power supplies are intended for audio equipment, where the peak
power required for some types of music can be 10 times the average
power, I could buy the manufacturer's explanation. Otherwise their
explanation of how they pass EN 61000-3-2:2000 sounds bogus to me.
An EN
Neil I can't answer your question directly, but..the EMC rules have
provisions which allow exclusion of items which draw more than 1kW and or are
not for consumer applications. Your power supplies may fall inside these
exclusions and therefore may not need EMC evaluation. We have a
Hi,
We have been using pfc corrected power supplies where each harmonic has
met the requirements of EN61000-3-2 Class A limits. Investigating some
new ranges of power supplies, we find that some individual harmonic
currents exceed the limits. The manufacturers have quoted sections 3Z1,
3Z3,
Dear Rich
Many thanks for your useful analyses.
I was wrong to suggest that the 'computer industry' is in denial about mains
harmonics - I realise that many people in that industry have made and are
making valuable contributions in that field.
But I am sure that the claims that there is 'no
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200201232308.paa21...@epgc264.sdd.hp.com) about 'Harmonic current
emissions', on Wed, 23 Jan 2002:
The additional cost for a PF-corrected SMPS is
not a constant adder; it is proportional to
power output. One must use higher power
Hi John:
But whichever method is adopted, the customer pays the bill eventually
and I
have more confidence in the highly competitive world of electronic
products
to come up with a cost-effective solution in a timely manner.
One of the USA's major objections to
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200201232003.maa21...@epgc264.sdd.hp.com) about 'Harmonic current
emissions', on Wed, 23 Jan 2002:
Hi Keith and Ghery:
There are a number of effects of harmonic current
emission from non-linear loads.
1) When a large number
Hi Keith and Ghery:
There are a number of effects of harmonic current
emission from non-linear loads.
1) When a large number of loads rich in triplen
harmonics are supplied from a 3-phase source,
the neutral current can be as high as root 3
of the phase current. (This effect
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