Feasible evaluations of coupled multilayered chip inductor for POL converters

Jun Imaoka, Shota Kimura, Yuki Itoh, Wilmar Martinez, Masayoshi Yamamoto, Michiaki Suzuki, Kenji Kawano

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Point of load (POL) converters require a small size and high-efficiency performance for IT industrial applications. In addition, the interleaved technique, magnetic integration, and application of GaN FETs are well known as good approaches to satisfy these demands in the power converters. Although coupled inductors for POL converters have been proposed in several studies, a coupled multilayered chip inductor has not been examined because of the difficulty of its construction. In this paper, a novel coupled multilayered chip inductor for interleaved POL converters is proposed. This novel coupled inductor has a pair of windings with inverse coupling in the magnetic core. Further, the magnetic material of the coupled inductor is an Fe-based metal composite powder (Fe-Si-Cr). Additionally, an Fe-based powder in the magnetic core has been processed with electrical insulation by a highly crystallized oxide nanolayer in order to reduce the eddy-current losses. Finally, the high efficiency performance of the coupled multilayered chip inductor is evaluated by prototypes of interleaved buck converters using normally off-type GaN FETs with a switching frequency of 1 MHz.

Original languageEnglish
Pages (from-to)126-135
Number of pages10
JournalIEEJ Journal of Industry Applications
Volume4
Issue number3
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

Magnetic cores
Field effect transistors
Powders
Magnetic materials
Power converters
Switching frequency
Eddy currents
Industrial applications
Insulation
Oxides
Composite materials
Metals

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

Cite this

Imaoka, J., Kimura, S., Itoh, Y., Martinez, W., Yamamoto, M., Suzuki, M., & Kawano, K. (2015). Feasible evaluations of coupled multilayered chip inductor for POL converters. IEEJ Journal of Industry Applications, 4(3), 126-135. https://doi.org/10.1541/ieejjia.4.126

Feasible evaluations of coupled multilayered chip inductor for POL converters. / Imaoka, Jun; Kimura, Shota; Itoh, Yuki; Martinez, Wilmar; Yamamoto, Masayoshi; Suzuki, Michiaki; Kawano, Kenji.

In: IEEJ Journal of Industry Applications, Vol. 4, No. 3, 01.01.2015, p. 126-135.

Research output: Contribution to journalArticle

Imaoka, J, Kimura, S, Itoh, Y, Martinez, W, Yamamoto, M, Suzuki, M & Kawano, K 2015, 'Feasible evaluations of coupled multilayered chip inductor for POL converters', IEEJ Journal of Industry Applications, vol. 4, no. 3, pp. 126-135. https://doi.org/10.1541/ieejjia.4.126
Imaoka, Jun ; Kimura, Shota ; Itoh, Yuki ; Martinez, Wilmar ; Yamamoto, Masayoshi ; Suzuki, Michiaki ; Kawano, Kenji. / Feasible evaluations of coupled multilayered chip inductor for POL converters. In: IEEJ Journal of Industry Applications. 2015 ; Vol. 4, No. 3. pp. 126-135.
@article{157d418d85c64234a920db99ee5ccb06,
title = "Feasible evaluations of coupled multilayered chip inductor for POL converters",
abstract = "Point of load (POL) converters require a small size and high-efficiency performance for IT industrial applications. In addition, the interleaved technique, magnetic integration, and application of GaN FETs are well known as good approaches to satisfy these demands in the power converters. Although coupled inductors for POL converters have been proposed in several studies, a coupled multilayered chip inductor has not been examined because of the difficulty of its construction. In this paper, a novel coupled multilayered chip inductor for interleaved POL converters is proposed. This novel coupled inductor has a pair of windings with inverse coupling in the magnetic core. Further, the magnetic material of the coupled inductor is an Fe-based metal composite powder (Fe-Si-Cr). Additionally, an Fe-based powder in the magnetic core has been processed with electrical insulation by a highly crystallized oxide nanolayer in order to reduce the eddy-current losses. Finally, the high efficiency performance of the coupled multilayered chip inductor is evaluated by prototypes of interleaved buck converters using normally off-type GaN FETs with a switching frequency of 1 MHz.",
author = "Jun Imaoka and Shota Kimura and Yuki Itoh and Wilmar Martinez and Masayoshi Yamamoto and Michiaki Suzuki and Kenji Kawano",
year = "2015",
month = "1",
day = "1",
doi = "10.1541/ieejjia.4.126",
language = "English",
volume = "4",
pages = "126--135",
journal = "IEEJ Journal of Industry Applications",
issn = "2187-1094",
publisher = "The Institute of Electrical Engineers of Japan",
number = "3",

}

TY - JOUR

T1 - Feasible evaluations of coupled multilayered chip inductor for POL converters

AU - Imaoka, Jun

AU - Kimura, Shota

AU - Itoh, Yuki

AU - Martinez, Wilmar

AU - Yamamoto, Masayoshi

AU - Suzuki, Michiaki

AU - Kawano, Kenji

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Point of load (POL) converters require a small size and high-efficiency performance for IT industrial applications. In addition, the interleaved technique, magnetic integration, and application of GaN FETs are well known as good approaches to satisfy these demands in the power converters. Although coupled inductors for POL converters have been proposed in several studies, a coupled multilayered chip inductor has not been examined because of the difficulty of its construction. In this paper, a novel coupled multilayered chip inductor for interleaved POL converters is proposed. This novel coupled inductor has a pair of windings with inverse coupling in the magnetic core. Further, the magnetic material of the coupled inductor is an Fe-based metal composite powder (Fe-Si-Cr). Additionally, an Fe-based powder in the magnetic core has been processed with electrical insulation by a highly crystallized oxide nanolayer in order to reduce the eddy-current losses. Finally, the high efficiency performance of the coupled multilayered chip inductor is evaluated by prototypes of interleaved buck converters using normally off-type GaN FETs with a switching frequency of 1 MHz.

AB - Point of load (POL) converters require a small size and high-efficiency performance for IT industrial applications. In addition, the interleaved technique, magnetic integration, and application of GaN FETs are well known as good approaches to satisfy these demands in the power converters. Although coupled inductors for POL converters have been proposed in several studies, a coupled multilayered chip inductor has not been examined because of the difficulty of its construction. In this paper, a novel coupled multilayered chip inductor for interleaved POL converters is proposed. This novel coupled inductor has a pair of windings with inverse coupling in the magnetic core. Further, the magnetic material of the coupled inductor is an Fe-based metal composite powder (Fe-Si-Cr). Additionally, an Fe-based powder in the magnetic core has been processed with electrical insulation by a highly crystallized oxide nanolayer in order to reduce the eddy-current losses. Finally, the high efficiency performance of the coupled multilayered chip inductor is evaluated by prototypes of interleaved buck converters using normally off-type GaN FETs with a switching frequency of 1 MHz.

UR - http://www.scopus.com/inward/record.url?scp=85018423150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018423150&partnerID=8YFLogxK

U2 - 10.1541/ieejjia.4.126

DO - 10.1541/ieejjia.4.126

M3 - Article

AN - SCOPUS:85018423150

VL - 4

SP - 126

EP - 135

JO - IEEJ Journal of Industry Applications

JF - IEEJ Journal of Industry Applications

SN - 2187-1094

IS - 3

ER -