Dear Other:
It seems like this discussion has been around for a long time in a slightly
different form. Input capacitors (x-y caps?) help kill the surges. As I recall
the size of these caps is limited by the allowable leakage currents. Maybe
someone can comment on the solution to that problem.
Fred Townsend
DC to Light
Kunde, Brian wrote:
Most all over the counter power supplies will pass the 2KV Line – PE
surge
immunity test (IEC 61000-4-5) when tested stand-a-lone, however, when these
power supplies are used in an assembly with other Mains driven devices through
a large Line Filter, the surge pulse seen at the power supply can be much
larger in amplitude. During the 2KV Line-PE test it is not unusual to see a
peak that exceeds 3KV or more. This is a common phenomenon.
Most power supply can handle the higher surge pulse, but some have
trouble
with it ranging from restarting to blowing its guts out. The problem seems to
be getting worst. We are having a hard time finding power supplies to pass
under these conditions.
Is there a simple solution to this problem? Are line – PE surge
suppressors
the only solution? Are they allowed in products going to Europe? I have
heard that northern Europe doesn’t allow line to PE surge suppression due to
safety. Has this changed? Is there a good over the counter device I can buy
and drop in my product?
If a surge suppressor is used, what requirements does it have to meet?
I hear
gas tubes are a must. How about overcurrent protection? Where would the fuse
go? In the PE line?
I have seen surge suppressors with UL and CSA agency approval, but not
with a
European agency approval (I may just be looking in the wrong place). Is this
evidence they are not allowed in Europe?
Thank you,
The Other Brian
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