EMI电源滤波器的共模插入损耗在失配状态的优化计算  

Optimization Calculation of the Common Mode Insertion Loss of EMI Filters under Impedance-mismatch Conditions

作　　者：甘明刚[1] 陈杰[1] 区健昌[1] 蔡涛[1] 

机构地区：[1]北京理工大学信息科学技术学院,北京100081

出　　处：《北京邮电大学学报》2006年第3期95-98,共4页Journal of Beijing University of Posts and Telecommunications

摘　　要：针对阻抗失配下电磁干扰(EMI)滤波器插入损耗的优化计算问题,详细分析了电源和负载阻抗对滤波器共模插入损耗的影响,提出了滤波器在失配情况下,共模插入损耗的优化计算方法.结果表明,由于寄生电容、电感的存在,滤波器在高频时的实际插入损耗与理论计算值有较大误差,用优化方法对1种通用滤波器的数学模型进行了校正.最后对高频校正模型和优化插入损耗计算方法进行了验证.To consider the optimization calculation of the common mode Insertion loss of EMI filters under impedance-mismatch Conditions, the effects of the source and load impedances on the insertion loss of filters are analyzed in detail. A method to calculate the minimum insertion loss of electromagnetic interference （EMI） filters under impedance-mismatch conditions is presented. The result indicates that the parasitic capacitance and parasitic inductance cause deviation of insertion loss measurements from theoretical calculation results in high frequency. The model of a typical kind of EMI filter is modified by optimization method. Finally, the modified model in high frequency and the method to calculate the minimum insertion loss is verified to be valid.

关 键 词：电磁干扰电源滤波器 插入损耗 阻抗失配 

分 类 号：TN713[电子电信—电路与系统]