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Standing Wave Pattern and Distribution of Currents in Resonator Arrays for Wireless Power Transfer

Author

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  • Mattia Simonazzi

    (Department of Electrical, Electronic and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Ugo Reggiani

    (Department of Electrical, Electronic and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Leonardo Sandrolini

    (Department of Electrical, Electronic and Information Engineering, University of Bologna, 40136 Bologna, Italy)

Abstract

The possibility of increasing the transmission efficiency in mid-range wireless power transfer (WPT) applications can be achieved by inserting resonant relay coils between the transmitting and receiving sides of the device, forming an array of magnetically coupled resonant circuits, over which a receiver can be placed. This is a very cheap solution for improving the performance of the WPT apparatus, even if the complexity of the system increases, requiring a complete and detailed investigation for a smart design and control of the apparatus. The presented study investigates the current distribution in the coils of the array, which revealed strong peaks in magnitude depending on the load and receiver position. The analysis is carried out with the transmission line (TL) theory and it is performed for different positions of the receiver, as well as for different load conditions. Furthermore, a real application is considered and discussed, which includes the presence of a power converter as power supply and a battery charging system as load. Each resonant circuit resonates at 150 kHz and the whole apparatus is capable to transmit power up to 1 kW with an efficiency around 70 % . The theoretical results have been validated with experimental measurements.

Suggested Citation

  • Mattia Simonazzi & Ugo Reggiani & Leonardo Sandrolini, 2022. "Standing Wave Pattern and Distribution of Currents in Resonator Arrays for Wireless Power Transfer," Energies, MDPI, vol. 15(2), pages 1-23, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:2:p:652-:d:726730
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    References listed on IDEAS

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    1. Najam ul Hassan & Woochan Lee & Byunghun Lee, 2021. "Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications," Energies, MDPI, vol. 14(4), pages 1-13, February.
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    Cited by:

    1. Jianwei Kang & Jie Lu & Deyu Zeng & Xiangyang Shi, 2022. "Analysis and Visualization of the Instantaneous Spatial Energy Density and Poynting Vector of the Wireless Power Transfer System," Energies, MDPI, vol. 15(16), pages 1-18, August.

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