4.5 Article

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

Journal

ENERGIES
Volume 15, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/en15020652

Keywords

wireless power transfer; inductive power transfer; resonator array; magneto-inductive waves; transmission lines

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This study investigates the possibility of increasing transmission efficiency in mid-range wireless power transfer applications by inserting resonant relay coils. The results show that the current distribution depends on the load and receiver position, and the theoretical findings are validated through experimental measurements.
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.

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