共模扼流圈磁芯磁场特性分析及其动态电感模型

Dynamic Inductance Model and Magnetic Field Analysis of Common Mode Choke

共模扼流圈的动态电感是其噪声抑制能力的重要参数,动态电感与功率电流偏磁、噪声频率、磁芯温度以及绕组结构都有很大关系。该文通过实验测量共模扼流圈磁芯材料特性参数,结合电磁场仿真分析,获取磁芯内部磁场分布数据,采用多元非线性回归算法构造了相应的磁芯材料特性参数模型、磁芯内部磁场分布模型,从而建立其动态电感模型,考虑了动态电感随功率电流偏磁、噪声频率、磁芯温度的影响。模型的建立对共模扼流圈优化设计、减小体积、提高噪声抑制能力提供设计指导。实验验证了模型的有效性。

Dynamic inductance is an important parameter for EMI common mode choke and has relationship with power current bias, noise frequency, core temperature and winding structures. Based on the test results of core material characteristic parameter and combined with the simulation analysis of the magnetic field, the magnetic field distributions in the core were obtained to further build the model of the magnetic field distribution in the core by multiple nonlinear regression algorithms and then the dynamic inductance model for the choke is built considering the influences of power current bias, noise frequency and core temperature. The model is very useful to provide design instruction for optimization, volume reduction or noise suppression ability increase for common mode choke. The validity of the model is verified by experiments.