How can the EMC limits of power acquisition equipment in a concentrator be met?

As a power acquisition device, the concentrator's EMC limits must meet both general standards (such as GB/T 9254) and applicable product-specific standards. The compliance strategy involves designing with sufficient margins. For conducted emissions (CE), in the 150kHz-30MHz band, Class A or Class B limits must be met (Class A is typically used in industrial environments). In terms of design, input filtering (common-mode inductor CMZ1211-501T + X/Y capacitors) and board-level filtering are used to control measured values below the limits by 6dB. For radiated emissions (RE), in the 30MHz-1GHz band, this depends on the enclosure shielding, internal PCB layout, and cabling. Regarding immunity, it must meet the severity levels specified in the GB/T 17626 series, such as surge level 4 and EFT level 4, achieved through graded protection and circuit hardening. Pre-compliance testing is crucial during the product development phase. Finally, formal testing is conducted in a third-party laboratory to obtain a compliance report.