2022 Fiscal Year Final Research Report
Investigation of magnetization mechanism in the flake composite magnetic core materials for beyond MHz frequency
| Project/Area Number |
19H02127
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 21010:Power engineering-related
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| Research Institution | Shinshu University |
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Principal Investigator |
Sato Toshiro 信州大学, 学術研究院工学系, 教授 (50283239)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 高周波電力用磁性材料 / ナノ結晶合金磁性材料 / 扁平粉末コンポジット / インダクタ／トランス / Beyond MHz / パワーエレクトロニクス |
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| Outline of Final Research Achievements |
Beyond MHz switching scheme using GaN power device is very effective to realize compact and lightweight DC-DC converter because of utilization of smaller inductor and transformer. Although the possible magnetic core for beyond MHz frequency is Ni-Zn ferrite only, it has a serious issue on the thermal runaway risk. The flake powder composite magnetic core is one of the strong candidates for beyond MHz inductor and transformer. In this study, Fe-Si-B-Nb-Cu nanocrystalline flake powder composite magnetic core was fabricated and clarified high-frequency magnetization mechanism. The composite magnetic core fabricated through a novel fabrication procedure for obtaining lower coercive force and smaller iron loss exhibited an iron loss of 1/6 at beyond MHz compared with the Ni-Zn ferrite. In addition, the planar magnetic devices were fabricated using the composited magnetic core and demonstrated to be effective through applying them to GaN-FET switch beyond 10MHz switching DC-DC converter.
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| Free Research Field |
高周波電力用磁性材料工学
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| Academic Significance and Societal Importance of the Research Achievements |
GaNパワーデバイスの登場によってDC-DCコンバータのスイッチング周波数をMHz以上に高周波化して電源システムの超小型化を実現しようという取り組みが活発になっているが、MHz以上の周波数帯のインダクタ・トランス用磁心材料は熱暴走リスクを持つNi-Znフェライトしか選択肢がない。本研究ではFe系ナノ結晶扁平粉末積層コンポジット磁心を作製し、高周波磁化機構の解明と材料の試作・評価をとおしてNi-Znフェライトを凌駕する低鉄損特性を実現した。本研究の成果は超高周波電力用磁性材料という新たな学術分野を開拓するとともに超小型軽量高効率次世代電源システムの実現に貢献するものと期待される。
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