基于有限元法的高频开关电源PCB地线设计电磁兼容分析  

EMC Analysis for PCB Ground Design of High-frequency SMPS Based on FEM

作　　者：杨晶晶[1] 王立龙[1] 

机构地区：[1]南京理工大学自动化学院,南京210094

出　　处：《电源世界》2014年第10期21-25,共5页The World of Power Supply

摘　　要：本文提出一种通过在高频开关电源PCB关键信号附近进行地线网格设计的方法,来减少高频开关电源PCB的辐射电磁干扰。基于有限元方法,分别对高频开关电源地线设计前后的PCB进行近场仿真,仿真结果表明在所选频点120MHz、150MHz、200MHz、600MHz处的近场辐射参数值均变小偏移,且在120MHz频点近电场强度降幅达到3.6374×102V/m,在600MHz近磁场强度降幅达到80%,强度明显减弱。得出在高频开关电源PCB设计时进行合理的设计地线,可以很好地改善开关电源的电磁兼容性。This paper presents a way to reduce the radiated EMI by ground grid design near the critical signal on the PCB of high- frequency SMPS. It simulates the high-frequency SMPS PCB generated by the PCB ground design or not using FEM and shows the near- field radiation parameters declined at the selected frequencies 120MHz, 150MHz, 200MHz and 900MHz.The near electric field strength drop to 3.6374 X 10V/m at the frequency of 120MHz, and the near magnetic field strength fell nearly 80% at 900MHz, significantly reduced the intensitv. We ~et the conclusion that the rationalground design of PCB can well imnrove the EMC for SMPS.

关 键 词：高频开关电源 地线网格 近场辐射参数 电磁兼容 

分 类 号：TN97[电子电信—信号与信息处理]