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Energies 2018, 11(2), 453; https://doi.org/10.3390/en11020453

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Department of Electronics Engineering, Technical University of Catalonia UPC, 08034 Barcelona, Spain
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Received: 30 December 2017 / Revised: 5 February 2018 / Accepted: 9 February 2018 / Published: 20 February 2018
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Abstract

Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of WPT have been reasonably enhanced by resonating the transmitter and receiver coils at a common frequency. Nevertheless, matching between resonance in the transmitter and receiver is quite cumbersome, particularly in single-transmitter multi-receiver systems. The resonance frequency in transmitter and receiver tank circuits has to be perfectly matched, otherwise power transfer capability is greatly degraded. This paper discusses the mistuning effect of parallel-compensated receivers, and thereof a novel dynamic frequency tuning method and related circuit topology and control is proposed and characterized in the system application. The proposed method is based on the concept of switch-mode gyrator emulating variable lossless inductors oriented to enable self-tunability in WPT receivers. View Full-Text
Keywords: inductive power transfer; dynamic resonance tuning; parallel compensated; switch-mode; gyrator; variable inductance; magnetic coupling; resonant inductive coupling; wireless power transfer (WPT) inductive power transfer; dynamic resonance tuning; parallel compensated; switch-mode; gyrator; variable inductance; magnetic coupling; resonant inductive coupling; wireless power transfer (WPT)
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Saad, M.; Alarcón, E. Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators. Energies 2018, 11, 453.

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