A Study on Design of Magnetic Thin Film Inductors for DC-DC Converter Applications

DC-DC Converter용 자성박막 인덕터 설계에 관한 연구

  • 윤의중 (호서대학교 제어계측공학과) ;
  • 김좌연 (호서대학교 재료공학과) ;
  • 박노경 (호서대학교 정보통신공학과) ;
  • 김상기 (한국전자통신연구원 회로소자기술연구소 전력소자팀) ;
  • 김종대 (한국전자통신연구원 회로소자기술연구소 전력소자팀)
  • Published : 2001.01.01

Abstract

In this study, the optimum structure of a magnetic thin film inductor was designed for application of DC-DC converters. The Ni$\sub$81/Fe$\sub$19/ (at%) alloy was selected as a high-frequency($\geq$MHz) magnetic thin film magnetron sputtering system. As-deposited NiFe thin films show similar magnetic properties compared to bulk NiFe alloys, indicating that they have a good film quality. The optimum design of dolenoid-type magnetic thin film inductors was performed utilizing a Maxwell computer simulator (Ansoftt HFSS V7.0 for PC) and parameters obtained from the magnetic properties of magnetic core materials selected. The high-frequency characteristics of the inductance(L) and quality factor(Q) obtained for the designed inductors through simulation agreed well with those obtained by theoretical calculations, confirming that the simulated result is realistic. The optimum structure of high-performance (Q$\geq$60, L = 1${\mu}$H, efficiency $\geq$90%), high-frequency ($\geq$5MHz), and solenoid-type magnetic thin film inductors was designed successfully.

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