How can we balance electromagnetic compatibility and functional safety in EPS (Electromagnetic Compatibility)?

Electromagnetic compatibility (EMC) design and functional safety (such as those involving IEC 62061, ISO 13849, or specific product safety standards) of EPS are complementary and must be considered simultaneously. EMC is a prerequisite for functional safety because electromagnetic interference can cause safety functions to fail or malfunction. Key design considerations include:

1. Enhanced EMC for safety-related circuits: Circuits implementing safety functions (such as emergency stop circuits, fault detection circuits, and safety interlocks) require higher levels of EMC protection, such as stronger filtering, more comprehensive shielding, and the use of highly immune isolation devices.

2. Redundancy and diagnostics: Hardware redundancy and periodic self-diagnostics commonly used in safety design can detect and tolerate occasional errors caused by EMI.

3. Fail-safe design: Ensure that the system can enter or remain in a predefined safe state (such as safe shutdown) in the event of EMC interference or component failure.

4. Analysis and verification: FMEA (Failure Mode and Effects Analysis) and FTA (Fault Tree Analysis) of the system are required, incorporating EMI as a potential cause of failure, and verifying the results through rigorous EMC and functional safety testing.