SMPS
If a SMPS is available on the EU market for end users, then the EMC
directive applies
Otherwise only the LV directive applies.
This implies that an component SMPS need not meet the EMC reqs.
Your product however, does and a SMPS is a critial component
as it comes to EMC. Therefore only manufacturers that provide you
with suitable data (test reports) can be trusted as not spoiling
your equipments emc behavior.
Most of your equipment needs also to comply with the harmonics
current requirements, unless below 50 Watts, so
a Power Factor Correction option may be mandatory.
Be aware of fundamental differences between IEC 61000-3-2:2000 and
EN 61000-3-2:2000
A property of power supplies that goes undocumented often, and that
is not specified in EMC standards either, is the filtering
property between YOUR electronics and the MAINS.
A compliant supply may suppress the EMI coming from your electronics,
while the same model after a design review (goes often unnoticed to
the customers) may not.
So a batch of your product may well comply for a few years, and
another batch may fail because a design change in the SMPS-model
not changing it's proper EMI but less filtering yours...!!!
Regarding electrical safety, if a SMPS needs a "Fire Enclosure",
that will not always be correctly advertised. The
fire enclosure will most often be left over to the enclosure
of your product, and even if the SMPS is provided with a compliant
fire enclosure, it's orientation might not be free to choose.
Most SMPS fire enclosures have a "bottom" part without holes.
This part needs to be mounted downwards to function as
a fire enclosure. If you mount it vertically, it's safety
will be compromised, and your product's enclosure will have
to meet the fire enclosure requirements.
Regards,
Gert Gremmen
Approvals manager
======================================================
ce-test, qualified testing
Member of EMC committee CENELEC/IEC
+ Independent Consultancy Services
+ Compliance Testing and Design for CE
+ Improvement of product quality and reliability
+ Testing services according to:
Electro magnetic Compatibility 89/336/EC
Electrical Safety 73/23/EC
Medical Devices 93/42/EC
Radio & Telecommunication Terminal equipment 99/5/EC
Website: www.cetest.nl (english)
www.ce-test.nl (dutch)
Phone : +31 10 415 24 26
Fax : +31 10 415 49 53
======================================================
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of GARY MCINTURFF
Sent: Tuesday, November 04, 2003 1:22 AM
To: ken.ja...@emccompliance.com; gl...@wmsgaming.com;
emc-p...@majordomo.ieee.org
Subject: Re: EU directives for SMPS
Mike,This won't address you question directly - but this is often a problem
with SMPS folks for a couple of reasons. 1) Price competition can be pretty
cut throat so they are not wanting to do anything they don't have to. 2)The
results of the emissions tests are heavily dependant upon the system in
which they are used. E.G Might work in my system and not in yours depending
on clocks used, how well we design the system etc. So they like to use both
clauses and avoid testing. The FCC requirements are, in my opinion a little
murky as well. I solve the problem in my purchase specifications by both
requiring that it will work when installed in my equipment and requiring
that they, at a minimum, provide me with a conducted emissions tests at min,
max and nominal load range and a radiated sweep at nominal. (Obviously this
is only for reference as youi system will undoubtably provide some shielding
- but it helps me in dealing with the mechanical boys to start identiify the
minimal shielding performance I expect out of the encloure - at least in
reference to the power supply. Also be aware that I have run into a few
cases where the SMPS purcahsed isn't necessarily the SMPS tested in the
first place. Uncontrolled and untested cost reduction etc can completely
obviate test results. Make sure the test results and the product part, and
revision numbers match. It CAN be ugly - but not if you're careful and you
monitor your vendor.
Gary
>From: Ken Javor <ken.ja...@emccompliance.com>
>Reply-To: Ken Javor <ken.ja...@emccompliance.com>
>To: "Sosnoski, Michael" <gl...@wmsgaming.com>,
>"'emc-p...@majordomo.ieee.org'" <emc-p...@majordomo.ieee.org>
>Subject: Re: EU directives for SMPS
>Date: Mon, 03 Nov 2003 15:51:04 -0600
>
>
>Not an area in which I am expert, but doesn't the low voltage directive
>point you at EMC requirements?
>
> > From: "Sosnoski, Michael" <gl...@wmsgaming.com>
> > Reply-To: "Sosnoski, Michael" <gl...@wmsgaming.com>
> > Date: Mon, 3 Nov 2003 13:48:48 -0600
> > To: "'emc-p...@majordomo.ieee.org'" <emc-p...@majordomo.ieee.org>
> > Subject: EU directives for SMPS
> >
> >
> > Can anyone tell me what EU directives are required for a SMPS?
> > I have a supplier telling me only the LVD is required? I am shocked
>that
> > the EMC directive would not be required for a SMPS also.
> > I will look at their DOC, and see what the declared-just wondering.
> >
> > Mike Sosnoski
> >
> > -------------------------------------------
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