开关电源印刷电路板电磁兼容问题的研究

摘要

Crosstalk between conductor traces on printed circuit board is one primary source of EMI in switching power supply.Field analysis is carried out to study the electric field on PCB.Simulation and measured emission map offer valuable visual aids to PCB designer,coupling index is introduced to indicate coupling level between two traces.Based on these emission maps and coupling index PCB designer can arrange critical trace in suitable location,so crosstalk problem between traces can be suppressed during PCB design stage.%印刷线路间的串扰问题是影响开关电源传导干扰水平的主要因素之一，而旨在降低串扰水平的布线设计却一直是设计中难点.本文提出了一种基于电场分析的开关电源印刷电路板EMC辅助设计的思想方法，其基本思想是以干扰强度分布图为参考选择布线区域，以耦合系数的实时计算结果为指导及时调整布线设计，帮助工程师在印刷线路板的设计阶段就把潜在的干扰抑制在尽可能低的水平上.计算和实验的结果证实了这种思想的可行性.