Re: Application of EN61000-3-2

Fri, 3 Oct 1997 22:15:26 +0000

At 14:58 03-10-97 -0500, you wrote:
>
>
> Benoit, Bojour de Virginia!
>
> Oui, ca devien complique..
>
> The letter of the law, as you stated, imposes harmonic limits with
> rated input current. My feelings are the intention is with a load
> similar to that used during EN5022 testing.
>
> Rated current is not clear to me. It seems that if the load was
> purely resistive, the power supply would have more chance of passing.
> In reality, a smaller, but reactive load, may give you worse readings.
>
> The only solution I can think of is to document the test conditions
> in your report(thus defining the load current yourself). That way you
> can not go wrong. (maybe)
>
> I am very curious to see others' opinions..
>
> Eric Petitpierre
> Pulsecom
> Herndon, VA
> 20171
>
> [email protected]
>
Bonjour de Montreal,

Thank you for your fast turn around. I would like that this could be as simple. However your comment gave me the idea to look in my copy of CSA C22.2 No.950 for a definition of rated current, I've found something when they discuss about a unit having multiple outlets. This is :

The RATED CURRENT marked on that unit shall be the total maximum current that can be on circuit at the same time and shall include the combined currents to all units in the group that can be supplied simultaneously through the unit and that can be operated simultaneously.

If this is the intent of EN61000-3-2 then all manufacturers of PC that uses a power supply of more that 75 watts is in trouble.






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Benoit Nadeau, ing. M.ing. (P.eng., M.eng)
Gerant du Groupe Conformite (Conformity Group Manager)
Matrox <http://www.matrox.com/>
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