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A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment

Author

Listed:
  • Thuc Phi Duong

    (Department of Electronics and Radio Engineering, Kyung Hee University, 1 Sochen, Giheung, Yongin, Gyeonggi 446-701, Korea)

  • Jong-Wook Lee

    (Department of Electronics and Radio Engineering, Kyung Hee University, 1 Sochen, Giheung, Yongin, Gyeonggi 446-701, Korea)

Abstract

To enable the geometrical freedom envisioned for wireless power transfer (WPT), fast dynamic adaptation to unpredictable changes in receiver position is needed. In this paper, we propose an adaptive impedance-searching system that achieves good impedance matching quickly. For fast and robust operation, the proposed method consists of three steps: system calibration, coarse search, and fine search. The proposed WPT system is characterized using distance variation and lateral and angular misalignment between coils. The measured results indicate that the proposed method significantly reduces searching time from a few minutes to approximately one second. Furthermore, the proposed system achieves impedance matching with good accuracy. The robust impedance-searching capability of the proposed system significantly improves power transfer efficiency. At 6.78 MHz, we achieve a maximum efficiency of 89.7% and a high efficiency of >80% up to a distance of 50 cm. When the center-to-center misalignment is 35 cm, the efficiency is improved from 48.4% to 74.1% with the proposed method. At a distance of 40 cm, the efficiency is higher than 74% for up to 60° of angular rotation. These results agree well with the simulated results obtained using a lumped-element circuit model.

Suggested Citation

  • Thuc Phi Duong & Jong-Wook Lee, 2015. "A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment," Energies, MDPI, vol. 8(8), pages 1-25, July.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:8:p:7593-7617:d:53216
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    Citations

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    Cited by:

    1. Po Hu & Jieshuai Ren & Wenan Li, 2016. "Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer," Energies, MDPI, vol. 9(7), pages 1-16, June.
    2. Ui-Gyu Choi & Jong-Ryul Yang, 2018. "A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System," Energies, MDPI, vol. 11(8), pages 1-15, August.
    3. Seyit Ahmet Sis & Emre Orta, 2018. "A Cross-Shape Coil Structure for Use in Wireless Power Applications," Energies, MDPI, vol. 11(5), pages 1-14, April.
    4. Wei Wang & Xueliang Huang & Linlin Tan & Jinpeng Guo & Han Liu, 2016. "Optimization Design of an Inductive Energy Harvesting Device for Wireless Power Supply System Overhead High-Voltage Power Lines," Energies, MDPI, vol. 9(4), pages 1-16, March.
    5. Shichun Yang & Xiaoyu Yan & Hong He & Peng Yang & Zhaoxia Peng & Haigang Cui, 2018. "Control Strategy for Vehicle Inductive Wireless Charging Based on Load Adaptive and Frequency Adjustment," Energies, MDPI, vol. 11(5), pages 1-23, May.
    6. Shaoteng Zhang & Jinbin Zhao & Yuebao Wu & Ling Mao & Jiongyuan Xu & Jiajun Chen, 2020. "Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter," Energies, MDPI, vol. 13(19), pages 1-15, October.
    7. Iftikhar Hussain & Dong-Kyun Woo, 2021. "Self-Inductance Calculation of the Archimedean Spiral Coil," Energies, MDPI, vol. 15(1), pages 1-13, December.
    8. Xu Liu & Chenyang Xia & Xibo Yuan, 2018. "Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance," Energies, MDPI, vol. 11(11), pages 1-21, October.
    9. Mohamed Saad & Eduard Alarcón, 2018. "Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators," Energies, MDPI, vol. 11(2), pages 1-23, February.
    10. Xu Liu & Jianhua Liu & Jianjing Wang & Chonglin Wang & Xibo Yuan, 2017. "Design Method for the Coil-System and the Soft Switching Technology for High-Frequency and High-Efficiency Wireless Power Transfer Systems," Energies, MDPI, vol. 11(1), pages 1-17, December.
    11. Zhenshi Wang & Xuezhe Wei, 2015. "Design Considerations for Wireless Charging Systems with an Analysis of Batteries," Energies, MDPI, vol. 8(10), pages 1-20, September.
    12. Linlin Tan & Jinpeng Guo & Xueliang Huang & Han Liu & Changxin Yan & Wei Wang, 2016. "Power Control Strategies of On-Road Charging for Electric Vehicles," Energies, MDPI, vol. 9(7), pages 1-14, July.

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