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Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications

Author

Listed:
  • Najam ul Hassan

    (Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea)

  • Woochan Lee

    (Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea)

  • Byunghun Lee

    (Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea)

Abstract

This paper proposes a wireless power transfer (WPT) system by placing repeater coils to transfer power to multiple loads for the internet of things (IoT) devices and sensors in smart grid applications. The proposed system intermediate resonators (repeaters) not only function as power relays to enhance the transfer distance but also supplies power to its load attached to them. Equal power distribution and load-independent characteristics were obtained without efficiency degradation when any one of the loads was changed during system operation. Identical high-quality factor coils were designed using Litz-wire to reduce the skin effect. The coil size was 15.5 cm × 15.5 cm and the four relays achieved total efficiency of 51.7%, delivering 2 W power and output voltage of 5 V to each load with a total power transfer distance of 62 cm.

Suggested Citation

  • Najam ul Hassan & Woochan Lee & Byunghun Lee, 2021. "Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications," Energies, MDPI, vol. 14(4), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:1035-:d:500291
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    Citations

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    Cited by:

    1. Young-Jin Park, 2022. "Next-Generation Wireless Charging Systems for Mobile Devices," Energies, MDPI, vol. 15(9), pages 1-4, April.
    2. Mattia Simonazzi & Ugo Reggiani & Leonardo Sandrolini, 2022. "Standing Wave Pattern and Distribution of Currents in Resonator Arrays for Wireless Power Transfer," Energies, MDPI, vol. 15(2), pages 1-23, January.
    3. Amjad, Muhammad & Farooq-i-Azam, Muhammad & Ni, Qiang & Dong, Mianxiong & Ansari, Ejaz Ahmad, 2022. "Wireless charging systems for electric vehicles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).

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