Both dV/dt and di/dt can have higher values at the lower voltages. This is
one of the peculiar phenomenae of ESD.
Hans Mellberg
Engineering Manager
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Peter,
I presume that you replying here for product use in North America only?
If the power supply is powered from the ac mains supply and it is intended
for use in Europe (and many other parts of the world) then no amount of
testing (e.g. to UL 1310) will be able to prove compliance with
Hello group,
It has become apparent to me that various standards require triangles at times
when others do not. For example, IEC 61010-1 Table 1 only indicates 3 symbols
that have the triangle enclosing the symbol. While, IEC 60417 does not
indicate this. One that seems to be missing from IEC
Hello all...
Only six days till our 5TH annual EMC Minisymposium!
On Tuesday, May 20, the Chicago area is sponsoring our 5TH annual EMC
MiniSymposium!
Here is the link to the details for this event!
http://www.ewh.ieee.org/soc/emcs/chicago/sectfiles/events.htm
Membership not required, All welcome, Bring a collegue
The Santa Clara Valley EMC Society is please to present:
. Tuesday, May 13th, 2003
Considerations for Advanced EMC Design Flow
By: Sudip Das
see www.scvemc.org for details and map
Details:
- In an ideal world, every hardware
1. Are they typically used for multiple voltage rail output?
Yes, in fact this is one of its benefits.
2. Typically higher, or lower current applications?
Lower current, and in my experience, under 300W of power
3. Do people have the RF Emissions figured out on them? or are people
To all interested parties:
The RMCEMC is pleased to announce our May 20th meeting.
Avoiding typical PCB EMI Problems and Effective Power/Ground Plane Decoupling
Presenter: Dr Bruce Archambeault
For full details please refer to our website at http://www.ieee.org/rmcemc
Best Regards
Scott,
I have designed a few off-line flybacks and one low voltage flyback converter.
They are typically not used above 100 watts output. They are especially good
for multiple outputs as the outputs tend to have tight inter-regulation. A
common output inductor is not needed. They can be built to
Heatsinks always bring up disagreement; but I believe that most of the
disagreements are based on availability of materials being traded off against
optimum performance.
Let's talk basics.
For heat sinking, you need to consider conduction, radiation and convection.
The heat must conduct
Zohar,
Put a jumper wire or connector in series with suppressors, allowing you to
conduct Hi-Pot Test on the unit without stressing any of these components.
The connection is resumed after placing jumper back on the board; unit shall
not be able to operate without the jumper.
Best Regards,
Alexandru -
You have received several good answers. I would add the
following.
To Rich Nute's descriptor of active devices, add,
nonlinear devices, to those types of components not
acceptable for use in place of insulation. This would
expand the scope to include gas tube and other voltage
Angus Doug -
Even though 1310 power supplies may only comply with Basic
Insulation (per UL60950), they have the bejeebers tested out
of them. UL1310 emphasizes testing over construction,
whereas UL60950 emphasizes the contrary.
Since a UL1310 power supply must meet the requirements for
NEC
Alice -
The answer to your questions is certifier dependant.
However, in most cases, the safety certifier mails the
reports to the factories and to their local field
product/factory auditors.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
The usual solution is to have the ground connection for the protection
devices (varistor and gas tube) provided by a screw that can be removed for
testing purposes, and then replaced after the test.
Donald Borowski
Schweitzer Engineering Labs
Pullman, WA
It could be an expensive exercise, but if you look at each of the national
adoptions of EN 60950 you should be able to make the same correlations as
with the French version.
Best regards,
Neil R. Barker
Compliance Engineering Manager
e2v technologies ltd
Waterhouse Lane
Chelmsford
Essex
CM1 2QU
Hi Kris,
in the German version of 60950 the same abbreviations are used as in the
English version.
e.g. SELV remains SELV and TNV remains TNV.
For the translation of the definitions, you have to go into the German
version of EN 60950.
For definitions in 60950 based on the IEV, you can find the
Dear Group,
I am looking for translations of expesssions and definitions used in IEC60950.
The french translation is not that difficult to find as it is part of
IEC60950, e.g. SELV becomes TBTS, TNV becomes TRT, etcbut I am more
looking for translations into other European languages.
Does
Dear Grope
We have designed an AC/DC converter constructed in the primary side with
two varistors (rated 275V), one side of one of them connect to Line , other
side connected to Earth through Gas Tube, second varistor one side
connected to Neutral and other side to Earth trough the same Gas
I am looking to procure an UK (or NATO) TEMPEST
standard/regulation -- JSP
480. Any help in finding a source for this doc will be
greatly appreciated.
Whether some confidentiality restrictions exist, they can be
resolved by our
library, as it has similar docs.
The MoD Defence
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