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An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

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  • Vijith Vijayakumaran Nair

    (School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea)

  • Jun Rim Choi

    (School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea)

Abstract

For magnetic-coupled resonator wireless power transmission (WPT) systems, higher power transfer efficiency can be achieved over a greater range in comparison to inductive-coupled WPT systems. However, as the distance between the two near-field resonators varies, the coupling between them changes. The change in coupling would in turn vary the power transfer efficiency. Generally, to maintain high efficiency for varying distances, either frequency tuning or impedance matching are employed. Frequency tuning may not limit the tunable frequency within the Industrial Scientific Medical (ISM) band, and the impedance matching network involves bulky systems. Therefore, to maintain higher transfer efficiency over a wide range of distances, we propose a multiple coil switching wireless power transmission system. The proposed system includes several loop coils with different sizes. Based on the variation of the distance between the transmitter and receiver side, the power is switched to one of the loop coils for transmission and reception. The system enables adjustment of the coupling coefficient with selective switching of the coil loops at the source and load end and, thus, aids achieving high power transfer efficiency over a wide range of distances. The proposed technique is analyzed with an equivalent circuit model, and simulations are performed to evaluate the performance. The system is validated through experimental results that indicate for a fixed frequency (13.56 MHz) that the switched loop technique achieves high efficiency over a wider range of distances.

Suggested Citation

  • Vijith Vijayakumaran Nair & Jun Rim Choi, 2016. "An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique," Energies, MDPI, vol. 9(3), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:3:p:156-:d:64966
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    References listed on IDEAS

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    1. Vijith Vijayakumaran Nair & Jun Rim Choi, 2015. "An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants," Energies, MDPI, vol. 8(6), pages 1-21, June.
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    Cited by:

    1. Aqeel Mahmood Jawad & Rosdiadee Nordin & Sadik Kamel Gharghan & Haider Mahmood Jawad & Mahamod Ismail & Mahmood Jawad Abu-AlShaeer, 2018. "Single-Tube and Multi-Turn Coil Near-Field Wireless Power Transfer for Low-Power Home Appliances," Energies, MDPI, vol. 11(8), pages 1-19, July.
    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. Chaoqiang Jiang & K. T. Chau & Chunhua Liu & Christopher H. T. Lee, 2017. "An Overview of Resonant Circuits for Wireless Power Transfer," Energies, MDPI, vol. 10(7), pages 1-20, June.
    4. Tommaso Campi & Silvano Cruciani & Mauro Feliziani, 2018. "Wireless Power Transfer Technology Applied to an Autonomous Electric UAV with a Small Secondary Coil," Energies, MDPI, vol. 11(2), pages 1-15, February.
    5. Zhihao Zhao & Yue Sun & Aiguo Patrick Hu & Xin Dai & Chunsen Tang, 2016. "Energy Link Optimization in a Wireless Power Transfer Grid under Energy Autonomy Based on the Improved Genetic Algorithm," Energies, MDPI, vol. 9(9), pages 1-16, August.
    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. Krithikaa Mohanarangam & Yellappa Palagani & Kunhee Cho & Jun-Rim Choi, 2021. "Inductive Power Transfer Link at 13.56 MHz for Leadless Cardiac Pacemakers," Energies, MDPI, vol. 14(17), pages 1-13, September.
    8. Matjaz Rozman & Michael Fernando & Bamidele Adebisi & Khaled M. Rabie & Tim Collins & Rupak Kharel & Augustine Ikpehai, 2017. "A New Technique for Reducing Size of a WPT System Using Two-Loop Strongly-Resonant Inductors," Energies, MDPI, vol. 10(10), pages 1-18, October.
    9. Matjaz Rozman & Michael Fernando & Bamidele Adebisi & Khaled M. Rabie & Rupak Kharel & Augustine Ikpehai & Haris Gacanin, 2017. "Combined Conformal Strongly-Coupled Magnetic Resonance for Efficient Wireless Power Transfer," Energies, MDPI, vol. 10(4), pages 1-18, April.
    10. Tommaso Campi & Silvano Cruciani & Francesca Maradei & Mauro Feliziani, 2019. "Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application," Energies, MDPI, vol. 12(18), pages 1-20, September.
    11. Youbin Jun & Jedok Kim & Sanguk Lee & Jaewon Rhee & Seongho Woo & Sungryul Huh & Changmin Lee & Seunghun Ryu & Hyunsoo Lee & Seungyoung Ahn, 2024. "Multiple-Split Transmitting Coils for Stable Output Power in Wireless Power Transfer System with Variable Airgaps," Energies, MDPI, vol. 17(16), pages 1-18, August.

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