介绍了多电源分布式开关电源在LED大屏上的应用现状及存在的谐波问题，分析和设计了HJLS阻波器对多电源分布式开关电源零线的谐波抑制。阻波器由新一代滤波节能器——HJLS零序阻波器组成，外加由电阻和双向晶闸管构成的保护电路。对设计的HJLS零序阻波器进行了数值仿真，并对于某LED大屏幕的开关电源供电系统进行了改造。对接入了HJLS零序阻波器投入前后的电流波形进行比较和分析，由实例证明了该方法的可靠性。

This essay introduces the application of distributed switching power supply on the large-scale LED display, and analyzed how to suppress the harmonics issue by HJLS wave trapper. The wave trapper consists of a capacitor and an inductance in parallel, it improves the protective relays and stable operation through followings actions, design as numerical simulation to HJLS wave trapper and modify the switch power supply for LED display, and compare and analysis the current waveforms without and with connecting HJLS wave trapper.