基于内置式永磁预偏磁的高频功率电感技术  

The Pre-Bias High Frequency Inductor Technology Based on the Built-in Type Permanent Magnet

作　　者：郑庆杰[1] 陈为[1] Zheng Qingjie;Chen Wei(Electrical Engineering and Automation College Fuzhou University,Fuzhou 350108 China)

机构地区：[1]福州大学电气工程与自动化学院

出　　处：《电工技术学报》2019年第21期4481-4491,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目（51777036,51277032）

摘　　要：在电力电子变换中,有很多始终处于单极性工作状态的电感,从磁化曲线上看就是始终工作于第一象限。基于永磁体的预偏磁电感技术可以将磁化曲线的起始工作点从零点预偏置到相反方向,从而有效拓宽磁通密度的有效工作范围,并缩小这类电感的体积。常规预偏磁电感都是将永磁体内置到气隙中或是外置构成并联磁路,但在电流产生的高频磁通通过永磁体时,会在永磁体内引起严重的涡流损耗问题,并导致电感损耗且发热增加严重,同时过高的温度会引起永磁体的退磁风险。该文介绍一种磁路设计方法,通过内置式永磁预偏磁方案,可以有效地解决实际应用中出现的结构复杂和永磁体损耗问题。通过理论分析,并结合电磁仿真和实验进一步验证,结果显示这种磁路设计方法可以有效地解决预偏磁技术在高频电感应用中的退磁问题。There are a lot of inductor working at unipolarity status all the time in the power conversion.The magnetization B-H curve in the first quadrant all the time.The pre-bias technology based on the permanent magnet(PM)could move the start point of B-H curve from zero point to the opposite direction.Thus it could broaden the working range of B value,and is better for reducing choke volume.Conventional pre-bias inductor put the PM in the magnetic core air gap or in the outside in parallel.But this solution would cause serious eddy current loss when the high frequency magnetic flux passed through the PM,and the choke loss would increase significantly,thus the higher temperature would cause demagnetization risk for PM.This paper introduced a magnetic loop design,it could solve these problems based on this built-in type PM for pre-bias technology.Based on the theoretical analysis and electromagnetic field simulation and experimental verification,the result shows this solution could effective solve application problems in high frequency pre-bias inductor.

关 键 词：高频电感 永磁体 预偏磁 涡流 

分 类 号：TM47[电气工程—电器]