Inductive wireless power transfer systems with high positional freedom

Thumbnail Image

Files

isbn9789526420530.pdf (31.24 MB)

URL

Journal Title

Journal ISSN

Volume Title

School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2024-11-01
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.

Authors

Date

2024

Department

Sähkötekniikan ja automaation laitos
Department of Electrical Engineering and Automation

Major/Subject

Mcode

Degree programme

Language

en

Pages

96 + app. 113

Series

Aalto University publication series DOCTORAL THESES, 207/2024

Abstract

Wireless power transfer (WPT) techniques provide opportunities for convenient and safe power delivery and battery charging over a wide variety of applications, ranging from low-power consumer electronics to industrial applications with kilo-Watt power levels. Currently, research in WPT field is very active but still at its early stage of development, where challenges arise at developments of every stage and component of power transfer systems. In addition to the main wireless link with inductively coupled coils, power converters and power switching components are also important topics since they are critical to the overall system efficiency. Development of WPT systems requires interdisciplinary studies including power electronics, electromagnetics, as well as control and optimization.  This dissertation provides an overview of challenges that have appeared during recent developments of WPT techniques and proposes solutions to some of the unsolved ones. In the first half of the dissertation, the typical structure of a single-channel WPT system is introduced stage-by-stage, from which we bring up discussions of challenges in terms of efficiency and losses, position freedom for power transfer, as well as design accuracy and simplicity. Known state-of-the-art research works have provided novel designs of coil structures and converter topologies as solutions to some of these challenges, while new challenges always come along which requires further settlements.  Novel solutions in this thesis are presented in the second half with respect to the three main aspects of challenges: positional freedom, power transfer efficiency, and implementation accuracy. New coil structures and a non-coherent power combining method are proposed to improve the degree of position freedom for wireless power transfer. In terms of challenges brought by increasing operating frequencies, new converter topologies and parameter design approaches are introduced to secure soft switching operations in both the design and implementation phases. Finally, the implementation is discussed at the system level, taking into consideration parasitic effects and mismatches between multiple power stages, and solutions are provided case-by-case. The parasitic effects in the system are either compensated or carefully avoided based on the proposed design guidelines.

Description

Supervising professor

Kyyrä, Jorma, Prof., Aalto University, Department of Electrical Engineering and Automation, Finland

Thesis advisor

Jayathurathnage, Prasad, Dr., Danfoss Drives, Finland

Keywords

wireless power transfer, resonant converters, soft-switching techniques, high frequency operations, position freedom

Other note

Parts

  • [Publication 1]: N. Ha-Van, Y. Liu, P. Jayathurathnage, C. R. Simovski and S. A. Tretyakov, "Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer," IEEE Transactions on Industrial Electronics, vol. 69, no. 10, pp. 10045-10054, October 2022.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202205243389
    DOI: 10.1109/TIE.2022.3151961 View at publisher
  • [Publication 2]: P. Jayathurathnage, Y. Liu and J. Kyyrä, "Self-Decoupled and Integrated Coils for Modular Multitransmitter Wireless Power Transfer Systems," IEEE Transactions on Power Electronics, vol. 37, no. 11, pp. 12962-12967, November 2022.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202208174878
    DOI: 10.1109/TPEL.2022.3181508 View at publisher
  • [Publication 3]: Y. Liu, P. Jayathurathnage and J. Kyyrä, "Parameter tuning method for class <T>2 converters for high-frequency wireless power transfer applications," In 2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe), Hanover, Germany, pp. 1-8, September 2022. https://urn.fi/URN:NBN:fi:aalto-202301181341
  • [Publication 4]: Y. Liu, P. Jayathurathnage and J. Kyyrä, "A New Simplified Method and Design Guidelines for the Optimization of Push-Pull Class <1>2 Converters for Wireless Power Transfer Applications," IEEE Transactions on Power Electronics, vol. 38, no. 8, pp. 10442-10459, August 2023.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202308114719
    DOI: 10.1109/TPEL.2023.3272840 View at publisher
  • [Publication 5]: Y. Liu, N. Ha-Van, P. Jayathurathnage, J. Kyyrä and S. A. Tretyakov, "Non-Coherent Power Combining for Self-Tuning Omnidirectional Wireless Power Transfer," In 2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe), Aalborg, Denmark, pp. 1-8, September 2023.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202311086775
    DOI: 10.23919/EPE23ECCEEurope58414.2023.10264575 View at publisher
  • [Publication 6]: Y. Liu, P. Jayathurathnage, S. A. Tretyakov, J. Kyyrä, "A new Push­ pull Class-<I> Converter for Multi-MHz Dual-frequency Wireless Power Transfer Applications," In 2023 IEEE Energy Conversion Congress and Exposition (ECCE), Nashville, TN, USA, pp. 1613-1619, October 2023.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202402072360
    DOI: 10.1109/ECCE53617.2023.10362393 View at publisher
  • [Publication 7]: Y. Liu, N. Ha-Van, P. Jayathurathnage, J. Kyyrä and S. A. Tretyakov, "Design and Performance Analysis of a Repeater-Assisted, Multi­Receiver Wireless Power Transfer System Operating at MHz Frequencies," IEEE Open Journal of the Industrial Electronics Society, vol. 4, pp. 773-785, December 2023.
    Full text in Acris/Aaltodoc: https://urn.fi/URN:NBN:fi:aalto-202401312204
    DOI: 10.1109/OJIES.2024.3349556 View at publisher
  • [Publication 8]: Y. Liu, S. A. Al Mahmud, N. Ha-Van, P. Jayathurathnage, J. Kyyrä and S. A. Tretyakov, "Non-coherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area," IEEE Transactions on Industrial Electronics, vol. 71, no. 11, pp. 13980-13990, November 2024.
    DOI: 10.1109/TIE.2024.3374391 View at publisher
  • [Publication 9]: S. A. Al Mahmud, N. Ha-Van, Y. Liu, P. Jayathurathnage, and S. A. Tretyakov, "Planar Free-Positioning Wireless Power Transfer Sys­ tem for Industrial and Automotive Robotic Applications," Submitted to IEEE Open Journal of the Industrial Electronics Society, August 2024.
    DOI: 10.36227/techrxiv.172253771.14282277/vl View at publisher

Citation

Permanent link to this item

https://urn.fi/URN:ISBN:978-952-64-2053-0

Collections

[diss] Sähkötekniikan korkeakoulu / ELEC