How to optimize the wiring in the terminal area of a power FTU?

Terminal area routing optimization reduces interface EMI. A zoned layout is adopted: power terminals, communication terminals, and sampling terminals are placed separately with a spacing greater than 15mm. PCB design: TVS protection is added to terminal pins, such as SMBJ24CA for power terminals and ESDSM712 for communication terminals. Filtering circuits are placed close to the terminals; for example, the common-mode inductor CMZ3225A-501T is less than 10mm from the terminal. Radial routing is used to avoid long parallel traces. Grounding terminals are connected to the main grounding point in a star configuration. Through optimization, radiated emissions from the terminal area are reduced by 10dB, and the electrostatic discharge immunity meets IEC 61000-4-2 Level 4 (contact discharge 8kV), satisfying outdoor installation environment requirements.