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I want to design a bridge for CAN to filter unwanted frequencies and improve EMC.What I mean I expect switching noise from nearby inverters / motor drives / PDUs to couple into the CAN interface (higher switching frequencies on new inverters, variable case material & further PCB placement. This is mainly a common-mode / high-frequency problem rather than a differential-data problem I’m working with 1 Mbps CAN, and I know that filters like low-pass, high-pass, or band-pass aren’t usually used in this context.

Does anyone know effective ways to improve EMC or implement something new for this? Now I am only considering the common mode choke but have not many other ideas.

Schematic I have for now:

enter image description here

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Pawel Cwikowski is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.
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    \$\begingroup\$ Hi Pawel, welcome here! This is a bit of a strange way to start it: You want to improve EMC. Sensible, but what do you improve about that? There's the general idea of stating the problem before describing the solution, and I think that might help here! \$\endgroup\$ Commented 5 hours ago
  • \$\begingroup\$ Pawel, what is the EMC threat you allude to? \$\endgroup\$ Commented 5 hours ago
  • \$\begingroup\$ Sorry, my original post was a bit chaotic so basiclly. What I expect is switching noise from inverters / motor drives / power converters (PDU) to couple into the CAN interface. The new inverter generation has higher switching frequencies than last year, and the enclosure material and PCB placement will also change. I’m not sure yet how these changes will influence the amount of noise getting onto the CAN lines. Because of that, I want to understand how to make this CAN schematic and interface more robust against unwanted high-frequency noise. \$\endgroup\$ Commented 5 hours ago
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    \$\begingroup\$ Do you already use shielded cables? Do you already use twisted pair cables? Do you have a good ground connection of the shields and a good grounding concept? These are the main things to worry about when it comes to EMC resilience. \$\endgroup\$ Commented 4 hours ago
  • \$\begingroup\$ There are CMC especially designed for CAN which you can use, together with optional caps and TVS. \$\endgroup\$ Commented 2 hours ago

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