开关电源远场共模电磁辐射模型及其特性研究  

Common mode far field radiation model & its characteristics of a flyback power supply

作　　者：和军平[1] 纪科健[1] 付琦[1] 王汝泉[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：《电工电能新技术》2012年第3期25-30,共6页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金(50877015);高等学校博士点基金(200802131017)资助项目

摘　　要：针对一台小功率反激式开关电源,从线缆共模辐射的角度辨识其主要共模电磁辐射等效激励源和辐射体结构,得出新形式的简化共模辐射模型。用Ansoft HFSS软件考察了该模型的远场辐射特性,通过与实测结果对比,验证了其有效性。最后,仿真研究了输入/输出线缆长度、电网共模射频阻抗、地平面、线缆布局等因素对共模远场辐射的作用。In this paper, a far field common mode radiation model, including equivalent driving source, radiation structure and some other key influence factors, is identified and built up for a low-power flyback power supply based on the asymmetry line antenna theory. Then the radiation characteristics of this model are analyzed by using Ansoft HFSS finite element electromagnetic software. Further more, simulation results are compared with the exper- iment results to verify effectiveness of the model. In the end, the radiation role of some main influence factors, such as the length of input/output cable, the impedance of AC grid, the layout of cable position and the reflect ground, are studied in detail by simulation too.

关 键 词：开关电源 远场辐射 共模辐射模型 有限元仿真 

分 类 号：TM155[电气工程—电工理论与新技术]