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Old 27th October 2020, 06:33 PM   #1
jackinnj is offline jackinnj  United States
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SMPS Input filters
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Input filter considerations for EMI mitigation -- from Tobias and Florian at Omicron Labs:

Webinar: Input Impedance and Filter Stability of DC/DC Converters - YouTube
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Old 28th October 2020, 03:17 PM   #2
454Casull is offline 454Casull  Canada
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Does this apply only to the onboard filtering on an SMPS, or does this also have an impact on an external EMI filter that may be present on a power entry module?

I'm planning on using a PEM with a built-in EMI filter, that will feed power to a Connex SMPS800RS. Anything you think I should worry about?
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Old 28th October 2020, 03:54 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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EMC looks at noise on the mains going into the device so a pre filter would also affect the conducted emissions.
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Old 28th October 2020, 06:33 PM   #4
jackinnj is offline jackinnj  United States
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I know with the Murata DC-DC converters you need to filter both the incoming and outgoing.
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