How can the conducted interference immunity (CS) of a smart controller (PAC) meet the standards?

To ensure the conducted interference immunity (CS) of the PAC (Power Controller Accreditation), filtering and isolation are applied to the power and signal ports. The power port uses a common-mode inductor (CMZ7060A-701T) and X/Y capacitors to form a filter, with a TVS (5.0SMDJ36CA) connected in parallel. The signal port uses a common-mode inductor (CML3225A-510T) and a TVS (SMBJ6.5CA). The PCB uses a multi-layer board with a complete ground plane. Shielded cables are used, and the shielding layer is grounded.

During testing, according to the IEC61000-4-6 standard, 10V (Level 3) RF interference is injected into the ports in the 150kHz-80MHz frequency band. The system function is not lost, and the performance degradation is within acceptable limits. Through design, the PAC can meet the requirements of Class A equipment, with a bit error rate of less than 10^-6 during testing.