Quality factor based design guideline for optimized inductive power transfer

Francesca Grazian, Wenli Shi, Thiago B. Soeiro, Jianning Dong, Peter van Duijsen, Pavol Bauer

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)
183 Downloads (Pure)


In high-power wireless battery charging that uses inductive power transfer, a considerable amount of power losses are located in the transmitter and receiver coils because they carry high resonant currents and typically have a loose coupling between them which increases eddy current losses. Therefore, the nominal operation needs to be chosen such that the coils' losses are minimized. Additionally, the inverter's semiconductors soft-switching improves both the power conversion efficiency and the electromagnetic compatibility of the system, thus it needs to be safeguarded for a wide operating range. However, depending on the chosen quality factor of the coils, it might happen that the minimum coils' losses and soft-switching are not satisfied at the same time. This paper defines a guideline on the parametric selection of the coils' quality factor such that the optimum operation of both the coils and the resonant converter can be achieved simultaneously. This parametric guideline is proposed for resonant converters implementing the four basic compensation networks: series-series, series-parallel, parallel-series, and parallel-parallel. Finally, circuit examples are provided for an 11 kW wireless battery charging system.

Original languageEnglish
Title of host publication2020 IEEE PELS Workshop on Emerging Technologies
Subtitle of host publicationWireless Power Transfer (WoW)
Number of pages6
ISBN (Electronic)978-1-7281-3746-9
ISBN (Print)978-1-7281-3747-6
Publication statusPublished - 2020
Event2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer, WoW 2020 - Virtual, Seoul, Korea, Republic of
Duration: 15 Nov 202019 Nov 2020


Workshop2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer, WoW 2020
Country/TerritoryKorea, Republic of
CityVirtual, Seoul

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Compensation networks
  • EV battery charging
  • Inductive power transfer
  • Quality factor
  • Wireless charging


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