摘要
提出一种调整变换器共模噪声源阻抗的方法。通过在对称式Boost变换器的耦合电感上加入平衡绕组,并在平衡绕组的末端加入平衡阻抗实现。对比不同噪声源阻抗下变换器的电磁干扰(electromagnetic interference,EMI)频谱,实验结果验证了该方法的有效性。文中所涉及的端口网络均采用散射参数(S参数)来描述,变换器的寄生电容通过有限元仿真得到。基于测得的S参数和寄生电容的仿真结果,建立平衡阻抗和EMI滤波器共模插入损耗之间的关系,并对平衡阻抗的取值进行预测。论文提出的方法可扩大噪声源端的阻抗失配,同时增大EMI滤波器的共模插入损耗。本方法的优势在于即使EMI滤波器的元件布局及其参数是固定,其性能仍可以通过调整平衡阻抗进行优化。因此,有效减少了传统EMI滤波器的重复设计过程,同时也避免了EMI滤波器的过设计问题。
This paper introduces a novel method to adjust the common mode（CM） noise impedance by adding a balanced winding in series with a balanced resistance. The balanced winding and two inductors of a balanced boost converter are wound in an E-E core, and they are taken as a six-port network. Two kinds of electromagnetic interference（EMI） filters and the six-port network are characterized using scattering parameters（S-parameters）, respectively. Stray capacitances of the converter are then simulated by finite element software. Based on the measured S-parameters and the simulation results, designers will find the relationship between the balanced resistance and the CM insertion loss of an EMI filter. Then, the value of balanced resistance can be predicted. Experiments are carried out to verify this method. The proposed method can widen the impedance mismatch on the noise source side and, in turn, significantly boost the CM insertion loss of an EMI filter. Following this method, researchers will improve the performance of an EMI filter even if its parameters are fixed. Thus, a design gap among impedance measurement, EMI filter characterization and EMI filter design can be bridged. At the same time, the over design of an EMI filter is avoided.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第6期993-1000,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51077106
51207118)~~
关键词
电磁干扰
对称式Boost变换器
耦合电感
平衡绕组
共模噪声阻抗调整
electromagnetic interference（EMI）
Balanced boost converter
coupled inductors
balanced winding
common mode（CM） noise impedance adjustment
