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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2019-12-07
Energy Distribution Characteristics of Magnetically Coupled Resonant Wireless Power Transfer Systems Considering Four Basic Reactive Power Compensations
By
Wanlu Li,

    Dr. Wanlu Li

    Chongqing University

    China

    Homepage

Quandi Wang,

    Dr. Quandi Wang

    Chongqing University

    China

    Homepage

Jianwei Kang,

    Dr. Jianwei Kang

    Southwest University of Science and Technology

    China

    Homepage

Yingcong Wang

    Dr. Yingcong Wang

    Chongqing University

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 86, 1-16, 2019
doi:10.2528/PIERM19071608 | Google Scholar

Abstract
To realize the attractive Wifi-type magnetically coupled resonant (MCR) wireless power transfer (WPT) techniques, not only the optimization of power and efficiency but also the spatial energy distribution characteristics (EDCs) should be considered. In this paper, the EDCs of three two-coil systems including an alignment system and systems with an angular and lateral misalignment are explored by the Poynting vector, and unified expressions of the active power density (APD) and reactive power density (RPD) are provided. Also, it is found that the APD is mainly distributed in the transmission path, and the RPD is mainly composed of three parts. When the phase difference between the currents in the transmitter and receiver tends to be π/2, the APD increases, and RPD decreases. The active power through an arbitrary infinite plane which intersects the transmission path but does not intersect the coupler is found equal to the transferred active power of the system, which is consistent with the results obtained by the circuit theory. Furthermore, the directionality of the APD is determined, and the APD is utilized to explain the coupling impedance in circuit theory. Then four basic reactive power compensations are considered, and it is recommended to use heavy load for the system with parallel compensation on the secondary side. Finally, the theoretical analysis is verified by simulation and experiment. This paper provides a significant reference for the analysis and design of the MCR WPT system and the improvement of the electromagnetic environment around the system.
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Citation
Wanlu Li, Quandi Wang, Jianwei Kang, and Yingcong Wang, "Energy Distribution Characteristics of Magnetically Coupled Resonant Wireless Power Transfer Systems Considering Four Basic Reactive Power Compensations," Progress In Electromagnetics Research M, Vol. 86, 1-16, 2019.
doi:10.2528/PIERM19071608
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