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 language | English |
|---|---|
| Pages (from-to) | 1555-1560 |
| Number of pages | 6 |
| Journal | PESC Record - IEEE Annual Power Electronics Specialists Conference |
| Volume | 2 |
| Publication status | Published - 1998 |
| Externally published | Yes |
| Event | Proceedings of the 1998 IEEE 29th Annual Power Electronics Specialists Conference, PESC. Part 2 (of 2) - Fukuoka, Jpn Duration: 1998 May 18 → 1998 May 21 |
ASJC Scopus subject areas
- Modelling and Simulation
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering