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

Najam ul Hassan, Woochan Lee and Byunghun Lee
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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

Energies, 2021, vol. 14, issue 4, 1-13

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.

Keywords: wireless power transfer; resonators; coupling coefficient; coil design; quality factor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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