AC Resistance Reduction Using Orthogonal Air Gaps in High Frequency Inductors

Mukherjee, Satyaki and Gao, Yucheng and Ramos Hortal, Regina and Sankaranarayanan, Vivek and Majmunovic, Branco and Mallik, Rahul and Dutta, Soham and Seo, Gab-Su and Johnson, Brian and Maksimović, Dragan (2019). AC Resistance Reduction Using Orthogonal Air Gaps in High Frequency Inductors. In: "2019 IEEE 20th Workshop on Control and Modeling for Power Electronics (COMPEL)", 17-20 Jun 2019, Toronto, Canadá. ISBN 978-1-7281-1842-0. pp. 1-6. https://doi.org/10.1109/COMPEL.2019.8769607.

Description

Title: AC Resistance Reduction Using Orthogonal Air Gaps in High Frequency Inductors
Author/s:
  • Mukherjee, Satyaki
  • Gao, Yucheng
  • Ramos Hortal, Regina
  • Sankaranarayanan, Vivek
  • Majmunovic, Branco
  • Mallik, Rahul
  • Dutta, Soham
  • Seo, Gab-Su
  • Johnson, Brian
  • Maksimović, Dragan
Item Type: Presentation at Congress or Conference (Article)
Event Title: 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics (COMPEL)
Event Dates: 17-20 Jun 2019
Event Location: Toronto, Canadá
Title of Book: 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics (COMPEL)
Date: 2019
ISBN: 978-1-7281-1842-0
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper presents a relatively simple technique to reduce winding losses due to fringing fields in high-frequency inductors. In high-frequency power electronics, ac inductor winding losses are affected by skin and proximity effects, including uneven current distribution due to fringing magnetic fields around airgaps. It is well known how fringing effects can be mitigated using distributed airgaps, at the expense of non-standard core or winding geometry. The orthogonal-airgap approach proposed in this paper combines airgaps in core segments parallel with the windings with airgaps in segments perpendicular to the windings. The approach is developed using a 1D analytical framework and validated by 2D finite-element simulations. Analytical guidelines are presented to optimize the airgaps to achieve minimum ac resistance. As a case study, a planar inductor is designed for an 8 kW SiC-based buck converter operating at 250 kHz. It is shown how the orthogonal airgaps result in more than 45% reduction in ac resistance and substantially reduced inductor losses compared to the design using standard airgaps. The results are verified by loss measurements on an experimental converter prototype.

More information

Item ID: 66879
DC Identifier: https://oa.upm.es/66879/
OAI Identifier: oai:oa.upm.es:66879
DOI: 10.1109/COMPEL.2019.8769607
Official URL: https://www.ieee-pels.org/pels-news/513-cfp-ieee-compel-2019-june-17-20-june,-2019-%E2%80%93-toronto
Deposited by: Memoria Investigacion
Deposited on: 29 Apr 2021 14:51
Last Modified: 29 Apr 2021 14:51
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