Comparison of magnetic materials for V-groove inductors in optimized high-frequency DC-DC converters

Author

Dhagat, Parul ; Prabhakaran, Satish ; Sullivan, Charles R.

Author_Institution

Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2008

Lastpage

2010

Abstract

The tradeoff between saturation flux density and resistivity in soft magnetic materials for thin film inductors is examined quantitatively. We use an optimization routine to evaluate the achievable efficiency and power density using designs individually optimized to make best use of particular materials. The optimization selects switching frequency, ripple ratio, inductor dimensions and MOSFET sizes. For the example application of a 3.3- to 1.1-V, 7-A output dc-to-dc converter, Co-Zr-O, Fe-Al-O and Co-Fe-B-Si-O materials are considered. Predicted efficiencies are in the range of 80% to 90% at power densities of 20 W/cm² to 1000 W/cm². Different materials show advantages in different power-density or efficiency ranges.

Keywords

DC-DC power convertors; cobalt compounds; ferromagnetic resonance; iron compounds; magnetic flux; magnetic particles; 3.3 to 1.1 V; 7 A; Co-Fe-B-Si-O; Co-Zr-O; DC-DC converters; Fe-Al-O; MOSFET sizes; V-groove inductors; granular films; inductor dimensions; power density; resistivity; ripple ratio; saturation flux density; soft magnetic materials; switching frequency; thin film inductors; Conductivity; DC-DC power converters; Design optimization; Magnetic cores; Magnetic materials; Power generation; Soft magnetic materials; Substrates; Switching frequency; Thin film inductors; Co-Fe-B-Si-O; Co-Zr-O; DC-DC converters; Fe-Al-O; granular films; high frequency; inductors; optimization; soft magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832480

Filename

1325388