一种调整共模噪声源阻抗并优化EMI滤波器性能的方法

发布时间：2019-03-26 08:54

【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。
[Abstract]:A method of adjusting the common-mode noise source impedance of the converter is proposed. A balanced winding is added to the coupled inductor of a symmetrical Boost converter and a balanced impedance is added to the end of the balanced winding. The electromagnetic interference (electromagnetic interference,EMI) spectrum of converters with different noise source impedances is compared. The experimental results show that the proposed method is effective. The port networks involved in this paper are described by scattering parameters (S parameters), and the parasitic capacitance of the converter is obtained by finite element simulation. Based on the measured S parameters and the simulation results of parasitic capacitance, the relationship between the balance impedance and the common-mode insertion loss of the EMI filter is established, and the value of the equilibrium impedance is predicted. The proposed method can enlarge the impedance mismatch of the noise source and increase the common-mode insertion loss of the EMI filter. The advantage of this method is that even if the element layout and parameters of the EMI filter are fixed, its performance can still be optimized by adjusting the equilibrium impedance. Therefore, the repetitive design process of the traditional EMI filter is effectively reduced, and the over-design problem of the EMI filter is also avoided.
【作者单位】：西安电子科技大学机电工程学院电气工程系;
【基金】：国家自然科学基金项目(51077106,51207118)~~
【分类号】：TM46;TN713

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