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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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