DC/DC开关电源对低压差分信号线干扰模型研究  

EMI model & analysis on DC /DC switched mode power supply to a LVDS

作　　者：和军平[1] 冯巨标[1] 李远航[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055

出　　处：《电机与控制学报》2014年第9期17-22,共6页Electric Machines and Control

基　　金：国家自然科学基金(50877015);国家留学基金(201206125059)

摘　　要：针对某一高密度印制电路板中,在板DC/DC Buck开关电源经电源分配网络对邻近低压差分信号线造成干扰的现象进行建模分析和量化研究,以指导和改善印制电路板的布局和布线设计。在实测和分析该现象干扰源特征、干扰耦合机理的基础上,建立起同步Buck变换器干扰源的电路预测模型,并基于有限时域积分方法提取出12V电源分配网络与低压差分信号线间的干扰耦合通道的PEEC高频电路模型。利用上述两模型,实现了低压差分信号线所受尖峰干扰的准确预测。基于上述耦合通道模型,仿真研究了电源分配网络与低压差分信号线间距离、平行长度等因素对耦合强弱的影响,并提出若干改善设计措施。A special electromagnetic interference（ EMI） phenomenon,which caused by a on-board DC /DC synchronous Buck converter to a pair of low voltage differential signal（ LVDS） signal lines through a power distribution network（ PDN） in a high layout density printed circuit board（ PCB）,was analyzed and researched in detail in order to improve printed circuit board placement and routing design. The electromagnetic interference source and its coupling paths were analyzed,and then a new electromagnetic interference prediction method for this phenomenon was proposed. A high frequency circuit model of the Buck converter was built up for the EMI source prediction and the coupling path partial equivalent element circuit（ PEEC） circuit model between 12 V power distribution network and low voltage differential signal lines was also set up using EMF software tool. The inducted spike electromagnetic interference waveform was then predicted by combing above models together and the prediction effect was validated by experiments. The influences of distance and parallel lengthen on coupling effect were studied too. Several EMI improve design measures were also suggested in the end.

关 键 词：电磁干扰 预测模型 电源分配网络 低压差分信号线 开关电源 

分 类 号：TM133[电气工程—电工理论与新技术]