Journal
IEEE TRANSACTIONS ON ENERGY CONVERSION
Volume 36, Issue 2, Pages 693-702Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2020.3034794
Keywords
Coils; Integrated circuit modeling; Magnetic fields; Resistance; Inductance; Magnetic resonance; Rotating field; wireless power transfer (WPT); resonant WPT; uniform magnetic field; robust efficiency; position-free; multi-user charging
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The study introduces a wireless power transfer system for multi-user charging that achieves a robust quasi-uniform power efficiency through balanced magnetic coils and phase-shifted currents. Experimental results at 2MHz confirm the system's stable spatial efficiency, with the 3-coil system showing higher efficiency and lower efficiency variance compared to the 2-coil system.
A wireless power transfer system for multi-user charging is proposed to demonstrate a robust quasi-uniform power efficiency in a 3-D space. It employs a set of balanced magnetic coils excited with phase-shifted currents on the transmitting side to feature omnidirectionality. In this article, two transmitter structures, 2-coil and 3-coil systems are discussed and compared. These systems produce a quasi-uniform magnetic field magnitude regardless of the locations of the receiving coils provided that the coils point to the center of the transmitting system sphere at the same distance. A simulation platform is established for the proposed method. Experimental results at 2MHz substantiate a uniform spatial efficiency and bound the average error of analytical calculations within 10%. Furthermore, the proposed method with rotating fields based on phase-shifted currents shows that the 3-coil system yields a higher efficiency and a lower efficiency spread, 6.8% improvement on average efficiency and 88.7% reduction on efficiency variance, compared to the 2-coil system.
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