How can energy storage systems meet the PCSCISPR 11 radiation limits?

To ensure that PCS meets the radiated emission limits of CISPR 11 (corresponding to the national standard GB 4824), systematic suppression measures are required. This standard specifies radiated field strength limits in the 30MHz-1GHz frequency band (classified into Class A/B environments). Compliance strategies include:

1. Source suppression: Optimize the driving of switching devices to reduce dv/dt and di/dt; adopt soft-switching technology; optimize PCB layout to minimize high-frequency loop area.

2. Propagation path shielding: Use a complete metal cabinet and ensure the continuity of shielding for all seams and openings (vents, cable entry points) (using gaskets, waveguide windows, and shielded connectors).

3. Cable handling: All incoming and outgoing cables must be shielded, and the shielding layer must be lapped and grounded at the cabinet entrance. Use ferrite cores on necessary cables.

4. Filtering coordination: Effective input and output EMI filters can reduce conducted noise, indirectly reducing radiation caused by cables. Compliance is a holistic project from chips, PCBs, modules to cabinets and cables, requiring repeated verification during the design and rectification phases.