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

Mattia Simonazzi, Ugo Reggiani and Leonardo Sandrolini
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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

Energies, 2022, vol. 15, issue 2, 1-23

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.

Keywords: wireless power transfer; inductive power transfer; resonator array; magneto-inductive waves; transmission lines (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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