基于磁场分割法的EE型电感器磁路参数计算
Calculation of Magnetic Circuit Parameters of EE-type Inductor Based on Magnetic Field Division Method
陈庚 1黄思仲 2杨玉岗 1林金城2
作者信息
- 1. 太原理工大学电气与动力工程学院,太原 030024
- 2. 厦门南磁电子有限公司,厦门 528322
- 折叠
摘要
开关电源电感器设计中,磁路参数的计算具有重要意义.首先,针对EE型磁芯中柱开气隙的电感器,结合有限元仿真,通过理论分析,利用磁场分割的方法将总磁通量分为 7 个等效磁通,提出无效匝数的概念,在充分考虑扩散磁通、旁路磁通及磁芯磁通分布不均匀影响的基础上,求得主气隙磁导等效面积的解析表达式,根据等效磁路模型,从而求得电感系数AL的解析表达式.提出磁密分布不均匀系数的概念,根据单位电流最大磁通密度,求得饱和电流IA的解析表达式.然后,采用编制 Excel 表的方式对磁路参数进行精确计算.最后,通过实验测量,验证了所建公式的准确性,可为设计人员提供有益参考.
Abstract
In the design of switching power supply inductors,the calculation of magnetic circuit parameters is of significance.For inductors with an open air gap in the column of EE-type iron cores,the total magnetic flux is divided into seven equivalent magnetic fluxes by using the method of magnetic field division through finite element simulation and theoretical analysis.The concept of invalid number of turns is proposed,and the analytical expression for equivalent area of air gap permeability is obtained on the basis of fully considering the influences of diffusion magnetic flux,bypass magnetic flux and uneven distribution of magnetic flux in the core.In addition,according to the equivalent magnetic circuit model,the analytical expression for inductance factor AL is obtained.The concept of inhomogeneity coefficient of magnetic flux density distribution is also proposed,and based on the maximum magnetic flux density per unit current,the analytic expression for saturation current IA is obtained.Afterwards,the magnetic circuit parameters are accurately calculated using Excel.Finally,the accuracy of the proposed formulas was verified by experimental measurements,providing a useful reference for designers.
关键词
EE型磁芯电感器/磁饱和/有效磁路参数/最大磁密/磁密分布不均匀系数Key words
EE-type iron core inductor/magnetic saturation/effective magnetic circuit parameter/maximum magnetic flux density/inhomogeneity coefficient of magnetic flux density distribution1引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据