基于3D打印技术的平面无源集成EMI滤波器研究
发布时间：2018-08-03 21:25
【摘要】：随着功率变换器工作频率的不断提高,电磁干扰(electromagnetic interference, EMI)成为一个不可忽视的问题。为了减小EMI,常用方法是在电源线和变换器端口安装EMI滤波器。然而常用的分立式EMI滤波器体积相对较大,空间上利用率偏低,导致开关电源的功率密度较小,为了减小平面EMI滤波器的体积,缩短制作周期,降低开模成本,增加功率密度,解决复杂模型制作困难等问题,提出一种利用3D打印机来实现EMI滤波器平面磁集成的技术。本文提出两种不同的磁集成EMI滤波器的结构。通过推导出估算电感值的简单有效的数学模型,并结合3D有限元仿真,saber仿真方法,证明该结构的正确性和准确性。并且建立简单的仿真电路,对比消除噪声插入损耗的曲线,证明利用该技术制作的平面EMI滤波器具有很好的滤波性能。为了进一步减小EMI滤波器的尺寸,增加功率变换器的功率密度,提出一种新型形状椭圆形平面L-C线圈结构。对矩形,椭圆形平面L-C线圈进行有限元仿真,通过对比其综合因素确定了椭圆形平面L-C线圈作为EMI滤波器的基本组成单元,并基于该结构实现了椭圆形L-C线圈无源集成EMI滤波器。在考虑共模电感的寄生电容和共模电容的寄生电感以及它们的等效电阻情况下,建立了平面无源集成EMI滤波器在寄生参数下的高频等效电路模型；利用二端口网络分析法的参数矩阵A推导插入损耗计算公式。通过分析邻近效应损耗公式,确定PCB上铜箔厚度,可以使损耗最小。通过仿真和实验分析对比,证明所提结构的正确性,以及高频电路和插入损耗计算式的正确性。
[Abstract]:With the increasing frequency of power converter, electromagnetic interference (electromagnetic interference, EMI) becomes a problem that can not be ignored. To reduce EMI, EMI filters are usually installed on power lines and converter ports. However, the commonly used discrete EMI filter is relatively large in volume and low in space utilization ratio, which results in smaller power density of switching power supply. In order to reduce the volume of planar EMI filter, shorten the manufacturing period, reduce the open mode cost and increase the power density, To solve the problem of making complex models, a 3D printer is proposed to realize the planar magnetic integration of EMI filters. This paper presents two different structures of magnetically integrated EMI filters. By deducing a simple and effective mathematical model for estimating inductance and combining 3D finite element simulation with saber simulation method, the correctness and accuracy of the structure are proved. A simple simulation circuit is set up and compared with the curve of eliminating noise insertion loss. It is proved that the planar EMI filter made by this technique has good filtering performance. In order to further reduce the size of EMI filter and increase the power density of power converter, a new elliptical planar LC coil structure is proposed. The rectangular and elliptical planar L-C coils are simulated by finite element method, and the elliptical plane L-C coils are determined as the basic components of EMI filter by comparing their comprehensive factors. Based on this structure, elliptical LC coil passive integrated EMI filter is realized. Considering parasitic capacitance and parasitic inductance of common-mode inductance and their equivalent resistance, the high-frequency equivalent circuit model of planar passive integrated EMI filter under parasitic parameters is established. The formula of insertion loss is derived by using the parameter matrix A of the two-port network analysis method. By analyzing the loss formula of proximity effect, the thickness of copper foil on PCB can be determined and the loss can be minimized. The correctness of the proposed structure and the calculation formula of high frequency circuit and insertion loss are proved by comparison of simulation and experiment.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
本文编号：2163038
[Abstract]:With the increasing frequency of power converter, electromagnetic interference (electromagnetic interference, EMI) becomes a problem that can not be ignored. To reduce EMI, EMI filters are usually installed on power lines and converter ports. However, the commonly used discrete EMI filter is relatively large in volume and low in space utilization ratio, which results in smaller power density of switching power supply. In order to reduce the volume of planar EMI filter, shorten the manufacturing period, reduce the open mode cost and increase the power density, To solve the problem of making complex models, a 3D printer is proposed to realize the planar magnetic integration of EMI filters. This paper presents two different structures of magnetically integrated EMI filters. By deducing a simple and effective mathematical model for estimating inductance and combining 3D finite element simulation with saber simulation method, the correctness and accuracy of the structure are proved. A simple simulation circuit is set up and compared with the curve of eliminating noise insertion loss. It is proved that the planar EMI filter made by this technique has good filtering performance. In order to further reduce the size of EMI filter and increase the power density of power converter, a new elliptical planar LC coil structure is proposed. The rectangular and elliptical planar L-C coils are simulated by finite element method, and the elliptical plane L-C coils are determined as the basic components of EMI filter by comparing their comprehensive factors. Based on this structure, elliptical LC coil passive integrated EMI filter is realized. Considering parasitic capacitance and parasitic inductance of common-mode inductance and their equivalent resistance, the high-frequency equivalent circuit model of planar passive integrated EMI filter under parasitic parameters is established. The formula of insertion loss is derived by using the parameter matrix A of the two-port network analysis method. By analyzing the loss formula of proximity effect, the thickness of copper foil on PCB can be determined and the loss can be minimized. The correctness of the proposed structure and the calculation formula of high frequency circuit and insertion loss are proved by comparison of simulation and experiment.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
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