Amund, there is no way to put a number to parasitics. We had a power supply
we used in three products and it passed line conducted with no issues. We
added it to a fourth product and it failed line conducted. Turned out in
the fourth product the wires to the AC power switch were routed close to
the switching inductor of the power supply. Twisting the AC wires to the
power switch along with a minor shifting of the wire route, solved the issue.
Jim Bacher, WB8VSU
j.bac...@ieee.org
JBRC Consulting LLC
Product EMC & Regulatory Consultant
https://www.trc.guru/ email:j...@trc.guru
IEEE Life Senior Member
On January 30, 2025 7:56:14 AM am...@westin-emission.no wrote:
During troubleshooting in test lab, it is tempting to be quick and connect
filter solutions with soldering and some wires.
Instead, you should probably lay out components on a pcb and get it as it
is described in the books. But in practice, at the test lab, you can't do
that and the question is how messy can such an EMI filter be?
How long can the wires between CM chokes, capacitors be and when you don't
solder but use Wago-connectors for interconnection, is it so that the
filter is almost already destroyed by the impedance that you have no
control over?
As we get up in frequency (conducted emission 150kH-30MHz), messy design /
connection will get more worse when frequency increase, but we will get
trouble anyway in the 150kH-30MHz range. At least from 1MHz. Right?
BR
Amund
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