【作者】 杨光；

【导师】 吕英华；

【作者基本信息】 北京邮电大学 ， 电磁场与微波技术， 2008， 硕士

【摘要】 高频开关电源的电磁干扰(EMI——Electromagnetic Interference)建模与仿真技术已经成为产品设计者在早期设计阶段分析预测高频开关电源电磁干扰的有效手段,越来越受到科研人员的重视。本文以高频开关电源中脉宽调制(PWM——Pulse Width Modulation)控制的Boost升压变换电路为对象,对其传导和辐射的EMI建模与仿真进行了研究,主要研究成果如下:1.采用场路结合的方法进行了Boost升压变换电路传导EMI的建模与仿真分析,重点讨论了集肤效应和完整地平面在10MHz至30MHz频段内对印刷电路板(PCB——Printed Circuit Board)高频特性的影响。2.基于传导EMI仿真结果,对以磁偶极子辐射模型为基础建立的PCB高频电流回路的辐射EMI模型进行了仿真分析。3.基于多导体传输线频域模型和电偶极子辐射模型建立了平行双线电缆的辐射EMI模型,采用基于三角基函数的矩量法计算得到了平行扁平电缆的电磁参数并探讨了其电磁参数特性,最后对模型进行了仿真分析。更多还原

【Abstract】 The electromagnetic interference (EMI) modeling and simulation technology of high frequency switching mode power supply has been the effective method to analyze and forecast the EMI of the high frequency switching mode power supply in the early stage of product design. Based on the Boost converter with pulse width modulation control, this thesis does the research on conducted and radiated EMI modeling and simulation of the converter. The main research results are as follows:1. With the field-circuit method, the conducted EMI modeling and simulation of the Boost converter is studied. And the influence of skin effect and ground plane on high frequency characteristic of the printed circuit board (PCB) is emphatically discussed in a frequency range of10MHz through 30MHz.2. Based on the magnetic dipole radiated model, the radiated EMI model of high frequency current loop on PCB is established and it is simulated and analyzed with the result of the conducted EMI simulation.3. Based on the frequency model of the multiconductor transmission lines and the electric dipole radiated model, the radiated EMI model of the parallel double cables is established. And then the electromagnetic parameters of the parallel ribbon cables are calculated with the method of moment based on the the triangular basis function and the characteristic of their electromagnetic parameters is also investigated. Finally, the radiated EMI model is simulated and analyzed.更多还原