kekon
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Did you try state-of-the-art "Y" capacitors between secondary and primary ground or mains L and N wire? Most off-the-shelf DC/DC converters have it.
is there ceramic cap at the output of acdc?
How close the pcbs to each other?
maybe try to put shield between the pcbs. shield connect to gnd of acdc pcb or gnd of button pcb or N
I see that adding a 1nF capacitor as shown in the previous picture solves the problem (however, i wonder why it works in this way....)
Could be that 1nF resonates with the CM choke near the flyback's switching frequency, causing it to better block common mode EMI.I see that adding a 1nF capacitor as shown in the previous picture solves the problem (however, i wonder why it works in this way....)
Of course.
There is an Y capacitor between primary and secondary GND
I mention the above because the 1nF "solution" above will likely cause a fail for EMC on the conducted and possibly radiated emissions
The capacitor will be removed for the EMI test and connected again after it
is some what less than professional, and in the EU, USA and a number of other countries, would be a confession of intent to break the law, i.e. a criminal offense.
Hi,
Wow..
You do a true EMI test ... for a single, privatly used application.
Klaus
try 10nF 630VDC caps across the bridge diodes, with 180E 0.5W in series with each cap...
Why not ?
I have a free unlimited access to one. Just for curiosity. Gaining new experiences is not a bad thing, is it ?
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