Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 1, Pages 260-269Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3048317
Keywords
Magnetic fields; Transmitters; Receivers; Wireless communication; Control systems; Amplitude modulation; Wireless power transfer; Directional method; rotational method; two-dimensional (2-D); wireless power transfer (WPT)
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Funding
- Hong Kong Research Grant Council under General Research Fund [17206715]
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This article compares the overall efficiency of the directional method and the rotational method for 2-D wireless power transfer systems. Theoretical analysis and experimental results show that the directional method has higher efficiency when the magnetic field vector is controlled within feasible zones.
Two-dimensional (2-D) wireless power transfer (WPT) systems can be controlled by either the directional method or the rotational method. The rotational method refers to the use of omnidirectional transmitter generating rotational flux regardless of the load positions, while the directional method refers to the use of omnidirectional transmitter generating magnetic flux directly toward the power-consuming load directions. This article compares the overall efficiency of the two methods for 2-D WPT systems. Theoretical analysis reveals that the directional WPT can be more efficient than the rotational WPT with either single or multiple loads when the magnetic field vector is controlled within the feasible zones; and the efficiency difference between the two methods are more significant when the dimensions of the receiver coils are smaller. Both simulation and experimental results are consistent in validating the two discoveries. They indicate that the averaged efficiency of the directional method is at least 5% higher than that of the rotational one.
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