A planar inductor using Mn-Zn ferrite/polyimide composite thick film for low-voltage and large-current DC-DC converter

被引：65

作者：

Kowase, I ^{[1
]}

Sato, T ^{[1
]}

Yamasawa, K ^{[1
]}

Miura, Y ^{[1
]}

机构：

[1] Shinshu Univ, Fac Engn, Nagano 3808553, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2005年 / 41卷 / 10期

关键词：

composite material; DC-DC converter; Mn-Zn ferrite; planar inductor; polyimide; screenprinting;

D O I：

10.1109/TMAG.2005.855164

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A new planar inductor using a composite magnetic core for low voltage and large current dc-dc converter has been developed. The composite material consisted of a 40% volume fraction of Mn-Zn ferrite particle with a mean diameter of 10 mu m and polyimide matrix. The composite magnetic core exhibited a low relative permeability of 6. The fabricated planar inductor with a size of 15 x 15 x 1.4 mm consisted of an inner two-turn copper square spiral coil, a top 350-mu m-thick composite magnetic core and a bottom 1-mm-thick Ni-Zn ferrite substrate. The inductor had a dc coil resistance of 15 m Omega and an inductance of 140 nH. The degradation of inductance was below 4% at a superimposed dc current of 10 A. A synchronous rectifier type buck converter with a switching frequency of 1 MHz, an input voltage of 5 V, and an output voltage of 1 V was constituted using a planar inductor, and exhibited a maximum conversion efficiency of 80% at 4 A.

引用

页码：3991 / 3993

页数：3