| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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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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