Fe-poor組成Mn-Zn-Tiフェライト磁心を用いたコモンモードチョークコイル : 磁気応用

概要

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To enhance the electrical resistivity of a Mn-Zn ferrite markedly, Fe_2 O_3 composition was reduced to less than 50mol%. Then to obtain good soft magnetic properties with this composition, TiO_2 was added to the component composition. We propose a Mn-Zn-Ti ferrite with Fe-poor composition, which has about 1,000 times higher resistivity and 100 times smaller permittivity than conventional Mn-Zn ferrite with Fe-rich composition, although it shows high initial permeability (4,500 at 100kHz). The common-mode impedance of the choke coil and the attenuation of the LC filter were investigated in order to compare this material with conventional Mn-Zn ferrite and Ni-Zn ferrite. It was found that this material was able to retain good magnetic properties in the high-frequency range the use of where Ni-Zn ferrite has been predominant. As a result, this material has potential for EMI applications over a wide frequency range which both conventional Mn-Zn ferrite and Ni-Zn ferrite have been used.
社団法人日本磁気学会の論文
2002-04-01