Research and development of Iron-based metal composite bulk magnetic core and its application to gapless reactor and transformer

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H02233
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Shinshu University
• Principal Investigator: SATO Toshiro 信州大学, 学術研究院工学系, 教授 (50283239)
• Co-Investigator(Renkei-kenkyūsha): FUNAKI Tsuyoshi 大阪大学, 大学院・工学研究科, 教授 (20263220) ; SONEHARA Makoto 信州大学, 学術研究院工学系, 准教授 (30456496)
• Research Collaborator: MURAKAMI Yasushi 信州大学, 学術研究院繊維学系, 教授 (90219907)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: パワーエレクトロニクス / SiC／GaNパワーデバイス / DC-DCコンバータ / リアクトル／トランス / 鉄心材料

Outline of Final Research Achievements

In order to realize the compact and light-weight highly efficient SiC/GaN power device DC-DC converter with a bottle-neck issue on the magnetic core for high frequency reactor and transformer, a novel heat resistant Fe-based metal composite magnetic core with small iron loss at MHz band was developed. The composite magnetic core consisting of 2.6 um size Fe-based amorphous powder with a thermally oxidized surface layer and 200℃ resistant epoxy resin binder exhibited 1/3 smaller MHz band iron loss than that of a bench mark core of Ni-Zn ferrite. The gapless leakage transformer using the Fe-based amorphous composite magnetic core was applied to a GaN power device MHz switching LLC resonant DC-DC converter. The novel magnetic core transformer operated in MHz switching resonant converter with a rating power of 120 W had an efficiency of 97% over and a power density per unit core volume of 90 W/cm3.

Free Research Field

電気電子工学