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Article

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

Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea
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Authors to whom correspondence should be addressed.
Energies 2021, 14(4), 1035; https://doi.org/10.3390/en14041035
Received: 13 January 2021 / Revised: 7 February 2021 / Accepted: 11 February 2021 / Published: 16 February 2021
(This article belongs to the Special Issue Next Generation Wireless Charging System for Mobile Devices)
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. View Full-Text
Keywords: wireless power transfer; resonators; coupling coefficient; coil design; quality factor wireless power transfer; resonators; coupling coefficient; coil design; quality factor
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MDPI and ACS Style

Hassan, N.u.; Lee, W.; Lee, B. Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications. Energies 2021, 14, 1035. https://doi.org/10.3390/en14041035

AMA Style

Hassan Nu, Lee W, Lee B. Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications. Energies. 2021; 14(4):1035. https://doi.org/10.3390/en14041035

Chicago/Turabian Style

Hassan, Najam u., Woochan Lee, and Byunghun Lee. 2021. "Efficient, Load Independent and Self-Regulated Wireless Power Transfer with Multiple Loads for Long Distance IoT Applications" Energies 14, no. 4: 1035. https://doi.org/10.3390/en14041035

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