How do EPSBMS and EMC work together?

The communication link (usually CAN or RS485) between the EPS and the Battery Management System (BMS) must ensure reliability in complex electromagnetic environments. EMC design for both systems must be coordinated:

1. Interface Protection Consistency: The same or compatible filtering and protection measures should be adopted at the communication ports of both the EPS and BMS. For example, using the same type of common-mode inductor (such as the CML series) and TVS/ESD protection devices to form symmetrical protection.

2. Grounding and Equipotential Bonding: Ensure that the communication ground (or shielding ground) of the EPS and BMS is reliably connected at one point (usually through the communication cable shielding layer) to avoid ground loop interference caused by a potential difference between the two. If the distance is long or their grounding systems are independent, it is strongly recommended to use isolated communication transceivers.

3. Communication Cable Requirements: Shielded twisted-pair cables must be used, with the shielding layer connected to the grounding busbar of each device at both ends.

4. Protocol Fault Tolerance: The communication protocol should have strong frame check, timeout retransmission, and error recovery mechanisms. Both parties should clearly define the interface EMC specifications during the design phase and conduct joint testing and verification.