4.8 Article

A Three-Resonator Wireless Power Transfer System With Constant-Output Feature Within a Misalignment Range

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 12, Pages 15753-15763

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3193147

Keywords

Constant output power; three-resonator wireless power transfer (WPT)

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The article proposes a design methodology for three-resonator WPT systems to achieve a constant output power in a wide coupling range. It reviews the basic characteristics of the three-resonator WPT system and presents the proposed design methodology in detail.
The magnetic coupling of a practical wireless power transfer (WPT) system is greatly influenced by the variations in the alignment of the magnetic couplers. For a given coupling range, a WPT system is expected to output the required rated power with a given load. However, this requirement cannot be easily met by the widely adopted series-series or inductor-capacitor-capacitor compensation topologies in a conventional two-resonator WPT system. This article proposes a design methodology for three-resonator WPT systems to achieve a constant output power in a wide coupling range. The basic characteristics of the three-resonator WPT system are reviewed and the proposed design methodology is presented in detail. A 3.3-kW three-resonator WPT prototype is designed and built, achieving nearly constant output in the given misalignment range. The measured dc-dc efficiency of the prototype reaches 94.47% at the rated power.

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