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EMI Filter Design
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Nikos A.:
Hi everyone,

Is there any tool/guide/simulator to proper calculate the EMI filters? More specifically I want to design the EMI filter for a DC 12V converter and I am facing difficulties..

Thanks is advance!!
tszaboo:
Würth has a tool for it's part
https://www.we-online.com/redexpert/#/home/article/emc-design-tools
And this is worth looking at, to figure out what you might need in the first place, depending on the frequency.
https://www.we-online.com/web/en/index.php/show/media/07_electronic_components/toolbox_1/Poster_Filter-Storage-Applikation.pdf
In the end it can be very difficult, or very easy, depending on what you want to do.
T3sl4co1l:
Not really. So much depends on the noise source, what the load is connected to, the layout, the enclosure -- that a general solution will be too general to be useful.

In short, guess a reasonable starting value, and allow room for testing of different parts and values.  Try all permutations of Y capacitors.

With a great amount of experience, you can anticipate which configurations are likely to be the most effective, but it's still guesswork.

There are enterprise-grade simulators that can include circuit, layout and enclosure and cabling in a full EM simulation, and produce representative EMI results without building a prototype; but the software suite to do this costs way more than a few protos and a few weeks of lab time, for most users.

Tim
tszaboo:

--- Quote from: T3sl4co1l on June 20, 2019, 02:26:15 pm ---Not really. So much depends on the noise source, what the load is connected to, the layout, the enclosure -- that a general solution will be too general to be useful.

In short, guess a reasonable starting value, and allow room for testing of different parts and values.  Try all permutations of Y capacitors.

With a great amount of experience, you can anticipate which configurations are likely to be the most effective, but it's still guesswork.

There are enterprise-grade simulators that can include circuit, layout and enclosure and cabling in a full EM simulation, and produce representative EMI results without building a prototype; but the software suite to do this costs way more than a few protos and a few weeks of lab time, for most users.

Tim

--- End quote ---
It could be a simple DC-DC converter for all we know...
T3sl4co1l:
What's "simple" about it? ;D

There are perhaps fewer variations of "DC-DC converter" than of other kinds, but all of them have to fit inside that generalization; it's still a broad net to cast.

Tim
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