Common mode noise is worse in isolated SMPS cf non-isolated SMPS?

treez · Apr 23, 2020

Hi,
Please may I re-visit this thread?..
https://www.edaboard.com/showthread...Flyback-SMPS-more-noisy-than-non-isolated-one

This question never gets answered on any forum or any website, or in any book, anywhere.
Do you know why this question has never been answered? Ie, what is the underlying technical nebulosity associated with this issue?

BradtheRad · Apr 23, 2020

See if you can post to the new duplicate thread below. There's a chance it might work although inactive threads are automatically closed by the system.

www.edaboard.com/showthread.php?389...Flyback-SMPS-more-noisy-than-non-isolated-one

Easy peasy · Apr 23, 2020

the short answer is yes, the former is worse than the latter ....

mtwieg · Apr 24, 2020

Typically the main source of common mode EMI in a flyback is current injected from the transformer's interwinding capacitance. When the flyback is non-isolated, most of that current will return through the local GND, rather than flowing to the source or load, resulting in lower CM EMI.

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Common mode noise is worse in isolated SMPS cf non-isolated SMPS?

treez

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