磁性材料复磁导率的宽带测量及模型北大核心CSCD

分析了线圈杂散参数对高频下复磁导率测量的影响,指出绕组电阻、寄生电容及漏感会导致传统复磁导率测量方法在高频下误差增大。在此基础上提出了使用单匝全包结构进行复磁导率宽带测量的方法,该方法适用于400 MHz以下频率的复磁导率测量。介绍了复磁导率的常见模型,并分别使用Levy法及有理函数迭代逼近法(IRFA)进行模型参数提取,分析了两种算法的优缺点及应用范围。应用推荐复磁导率测量方法对三种磁性材料进行了复磁导率的测量和建模,结果表明,使用推荐的复磁导率测量方法及数据提取算法,可以较好地实现对磁性材料的小信号建模。

Complex permeability broadband measurement and modeling of magnetic material

Parasite parameters caused by winding have negative impact on broadband complex permeability measurement. This paper identifies the effects of winding resistance, parasite capacitor and leakage inductance. The impact of each parasite parameter is quantitatively determined and an improved measurement method is proposed to mitigate the influence of the parasite parameters. Furthermore, commonly used complex permeability models are introduced. The Levy method and iterative rational function approaching (IRFA) method are used to extract model parameters. The proposed method has been applied to three different kinds of magnetic materials and satisfactory results have been obtained, which conforms the proposed measurement method and parameter extraction algorithms are suitable for building the small-signal model for magnetic materials.