Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution

Andres Revilla Aguilar; Binyu Cui; Jun Wang; Hongbo Zhao

doi:10.1109/ECCE58356.2025.11260001

Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution

Andres Revilla Aguilar, Binyu Cui, Jun Wang, Hongbo Zhao

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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Abstract

This paper presents a new type of planar inductor, biased with permanent magnets and presenting increased energy density for DC applications. The proposed design utilizes standard planar ferrite EI cores with no airgaps. The equivalent reluctance of an airgap is achieved by saturating a localized portion of the core. Due to the absence of physical airgaps, the fringing flux and its detrimental effects, on the winding's current density distribution, are minimized. The proposed inductor topology is analyzed using 2D FEA simulations. The physically implemented prototype is compared against a common non-biased inductor, with the same core and windings and using physical airgaps. Empirical laboratory measurements show that the proposed planar biased prototype achieves equivalent inductance, higher saturation current, and lower energy losses compared with the nonbiased reference.

Original language	English
Title of host publication	IEEE Energy Conversion Congress and Exposition, ECCE
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Number of pages	5
ISBN (Electronic)	9798331541309
ISBN (Print)	9798331541316
DOIs	https://doi.org/10.1109/ECCE58356.2025.11260001
Publication status	Published - 3 Dec 2025
Event	2025 IEEE Energy Conversion Congress & Expo (ECCE) - Pennsylvania Convention Center, Philadelphia, United States Duration: 19 Oct 2025 → 23 Oct 2025 https://www.ieee-ecce.org/2025/

Publication series

Name	IEEE Energy Conversion Congress and Exposition, ECCE
Publisher	IEEE
ISSN (Print)	2329-3721
ISSN (Electronic)	2329-3748

Conference

Conference	2025 IEEE Energy Conversion Congress & Expo (ECCE)
Abbreviated title	ECCE 2025
Country/Territory	United States
City	Philadelphia
Period	19/10/25 → 23/10/25
Internet address	https://www.ieee-ecce.org/2025/

Bibliographical note

Publisher Copyright:
©2025 IEEE.

Access to Document

10.1109/ECCE58356.2025.11260001

Full-text PDF (accepted manuscript)
This is the accepted author manuscript (AAM) of the article which has been made Open Access under the University of Bristol's Scholarly Works Policy. The final published version (Version of Record) can be found on the publisher's website. The copyright of any third-party content, such as images, remains with the copyright holder.
Accepted author manuscript, 713 KBLicence: CC BY

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Automated Triple Pulse Testbed (ATPT) 1.0 – Large-Signal Hardware-in-the-loop Characterization Platform for Power Magnetics
Cui, B., Wang, J., Yuan, X., Aguarón, J., Martínez, A. & Cabaleiro, F., 2 Jul 2024, 2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia). Institute of Electrical and Electronics Engineers (IEEE), p. 1613-1618 6 p.
Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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Cite this

@inproceedings{a5f7287101044ae098214590365eaff4,

title = "Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution",

abstract = "This paper presents a new type of planar inductor, biased with permanent magnets and presenting increased energy density for DC applications. The proposed design utilizes standard planar ferrite EI cores with no airgaps. The equivalent reluctance of an airgap is achieved by saturating a localized portion of the core. Due to the absence of physical airgaps, the fringing flux and its detrimental effects, on the winding's current density distribution, are minimized. The proposed inductor topology is analyzed using 2D FEA simulations. The physically implemented prototype is compared against a common non-biased inductor, with the same core and windings and using physical airgaps. Empirical laboratory measurements show that the proposed planar biased prototype achieves equivalent inductance, higher saturation current, and lower energy losses compared with the nonbiased reference.",

author = "Aguilar, \{Andres Revilla\} and Binyu Cui and Jun Wang and Hongbo Zhao",

note = "Publisher Copyright: {\textcopyright}2025 IEEE.; 2025 IEEE Energy Conversion Congress \& Expo (ECCE), ECCE 2025 ; Conference date: 19-10-2025 Through 23-10-2025",

year = "2025",

month = dec,

day = "3",

doi = "10.1109/ECCE58356.2025.11260001",

language = "English",

isbn = "9798331541316",

series = "IEEE Energy Conversion Congress and Exposition, ECCE",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

booktitle = "IEEE Energy Conversion Congress and Exposition, ECCE",

address = "United States",

url = "https://www.ieee-ecce.org/2025/",

}

Aguilar, AR, Cui, B , Wang, J & Zhao, H 2025, Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution. in IEEE Energy Conversion Congress and Exposition, ECCE. IEEE Energy Conversion Congress and Exposition, ECCE, Institute of Electrical and Electronics Engineers (IEEE), 2025 IEEE Energy Conversion Congress & Expo (ECCE), Philadelphia, United States, 19/10/25. https://doi.org/10.1109/ECCE58356.2025.11260001

Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution. / Aguilar, Andres Revilla; Cui, Binyu ; Wang, Jun et al.
IEEE Energy Conversion Congress and Exposition, ECCE. Institute of Electrical and Electronics Engineers (IEEE), 2025. (IEEE Energy Conversion Congress and Exposition, ECCE).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution

AU - Aguilar, Andres Revilla

AU - Cui, Binyu

AU - Wang, Jun

AU - Zhao, Hongbo

PY - 2025/12/3

Y1 - 2025/12/3

N2 - This paper presents a new type of planar inductor, biased with permanent magnets and presenting increased energy density for DC applications. The proposed design utilizes standard planar ferrite EI cores with no airgaps. The equivalent reluctance of an airgap is achieved by saturating a localized portion of the core. Due to the absence of physical airgaps, the fringing flux and its detrimental effects, on the winding's current density distribution, are minimized. The proposed inductor topology is analyzed using 2D FEA simulations. The physically implemented prototype is compared against a common non-biased inductor, with the same core and windings and using physical airgaps. Empirical laboratory measurements show that the proposed planar biased prototype achieves equivalent inductance, higher saturation current, and lower energy losses compared with the nonbiased reference.

AB - This paper presents a new type of planar inductor, biased with permanent magnets and presenting increased energy density for DC applications. The proposed design utilizes standard planar ferrite EI cores with no airgaps. The equivalent reluctance of an airgap is achieved by saturating a localized portion of the core. Due to the absence of physical airgaps, the fringing flux and its detrimental effects, on the winding's current density distribution, are minimized. The proposed inductor topology is analyzed using 2D FEA simulations. The physically implemented prototype is compared against a common non-biased inductor, with the same core and windings and using physical airgaps. Empirical laboratory measurements show that the proposed planar biased prototype achieves equivalent inductance, higher saturation current, and lower energy losses compared with the nonbiased reference.

U2 - 10.1109/ECCE58356.2025.11260001

DO - 10.1109/ECCE58356.2025.11260001

M3 - Conference Contribution (Conference Proceeding)

SN - 9798331541316

T3 - IEEE Energy Conversion Congress and Exposition, ECCE

BT - IEEE Energy Conversion Congress and Exposition, ECCE

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - 2025 IEEE Energy Conversion Congress & Expo (ECCE)

Y2 - 19 October 2025 through 23 October 2025

ER -

Planar Permanent Magnet Biased Inductor with Improved Current Density Distribution

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Bibliographical note

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Research output

Automated Triple Pulse Testbed (ATPT) 1.0 – Large-Signal Hardware-in-the-loop Characterization Platform for Power Magnetics

Cite this