"DC SMPS are not subject to conducted emissions"DC SMPS are not subject to conducted emissions, (only AC inputs) so DC-DC boards are more a concern for radiated emissions. Your differential filter “could” be conducting too much sine current, if you do not have a good Balun, otherwise OK. Spread spectrum would be better with the same noise current, if that were possible.
Your ground plane will become a patch antenna of all the current spectrum in Vin to Gnd unless perfectly RF balanced cancelling emissions, far-field, occur from the power plane.
I was neglecting specialized industries which ignore IEC, FCC, EU regulations have their own rules like Telco, Aero, Space, Nuclear etc. User in those fields don't cross paths here much although I was in all of these at different stages of my career."DC SMPS are not subject to conducted emissions"
I find that an interesting comment, could you elaborate please? I do Aircraft parts and both DC and AC systems have to to meet both conducted and radiated emissions.
Thanks, see your point, i used to work with an engineer who designed SMPS for the UK military....they said that finding the values and amounts of ferrite beads, y caps and common mode chokes needed to pass common mode EMC was a bit like, "throwing currents into a cake"We have to meet RFI/EMC standards for the DC lines on telecom power supplies - we never model this - testing is the only way.
Thank you, I was generally curious. I've been 22 years in the Aerospace sector so my experience is very specific to that. I was intrigued but the statement because it is often the greatest headacheI was neglecting specialized industries which ignore IEC, FCC, EU regulations have their own rules like Telco, Aero, Space, Nuclear etc. User in those fields don't cross paths here much although I was in all of these at different stages of my career.
I welcome your insights.
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