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Efficient common-mode noise filtering

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cyberblak

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Hi,

I use a high voltage power supply to power a sensitive circuit. The power supply is a switching (no alternatives, since I have to convert 12V into 300V), thus I want to heavily filter the output in order to protect the sensitive circuit.

I know that I should filter both in common-mode and in differential mode. I want to know how to efficiently filter a DC output as this one? I saw a lot of app notes about filtering an AC line (common-mode choke + capacitor from both lines to earth), but of course this is hardly applicable on a DC circuit...

Any ideas or references?

Thanks,

cyberblak
 

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