Operation characteristics of a buck/boost converter using a layered inductor with high resistive Fe(CoFe)-M-O (M = Hf,Zr,rare-earth) films

Yoshito Sasaki, Sumihito Morita, Takashi Hatanai, Akihiro Makino, Toshiro Sato, Kiyohito Yamasawa

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Fe(CoFe)-M-O (M = Hf, Zr, rare-earth) films have excellent soft magnetic properties at a high frequency for their high electrical resistivity. Layered inductors using the magnetic films have a low loss at a high frequency. Accordingly, the DC-DC converter using these layered inductors exhibit a high efficiency for the high frequency drive. Layered inductor using nanocrystalline Fe61Hf13O26 and Co44Fe19Hf15O22 film exhibit the Q of 8.4 and 12.3 at 5 MHz. The micro DC-DC converter using nanocrystalline Fe61Hf13O26 film and Co44Fe19Hf15O22 film exhibit the maximum efficiency of 83.5% and 86% in the boost converter driving at 5 MHz. Furthermore, thin film inductor using Fe55Hf11O34 film which size of 3.5 mm2 exhibits L of 950 nH and Q of 6.6 at 5 MHz. Then, they are evident that high resistive nanocrystalline Fe(CoFe)-Hf-O films are effective for the high frequency micro DC-DC converter.

Original languageEnglish
Pages (from-to)1555-1560
Number of pages6
JournalPESC Record - IEEE Annual Power Electronics Specialists Conference
Volume2
Publication statusPublished - 1998 Jan 1
Externally publishedYes
EventProceedings of the 1998 IEEE 29th Annual Power Electronics Specialists Conference, PESC. Part 2 (of 2) - Fukuoka, Jpn
Duration: 1998 May 181998 May 21

ASJC Scopus subject areas

  • Modelling and Simulation
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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