含有非磁性气隙层叠层电感直流特性的研究

Research on DC Bias Current Characteristics of Multilayer Chip Inductors with Non-magnetic Air Gap

为了获得适合功率电感磁芯材料的磁导率及提升器件的直流特性,提出了在器件磁芯材料层中引入一定厚度的非磁性气隙层可有效调节磁芯材料的磁导率,以提升器件的直流偏置性能.设计仿真了尺寸为2.0 mm×2.5×1.05 mm,含有10匝线圈的叠层功率电感中引入非磁性气隙层的直流特性.研究了在磁芯中部引入5～20 μm不同厚度气隙层的直流特性,结果表明直流电流从1.18A上升到2.34 A;同时研究了引入不同层数及不同分布排列的气隙层的直流特性,表明气隙层数越多,分布在磁芯中越稀疏,可获得更好的直流性能.

To obtain the suitable permeability of the magnetic core material and enhance the DC characteristics of power inductor device, a certain thickness of the non-magnetic air gap into magnetic core material is introduced to enhance DC bias performance of the devices. The DC characteristics of MLCI with the size of 2.0 mm ×2.5 mm ×1.05 mm and with 10 turns coils is designed and simulated, the non-magnetic gap layer is placed at the center of pla nar coil The DC characteristics of different thickness gap from 5 μm to 20 μm is studied. Results show that IDC values rise from 1.18 A to 2.34 A. DC characteristics with different layers and different distribution arrangement of gap layers are also discussed, indicating that the more gap layers and the more sparsely distributed in the core, the better is DC performance.