Journal
ENERGIES
Volume 14, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/en14041035
Keywords
wireless power transfer; resonators; coupling coefficient; coil design; quality factor
Categories
Funding
- Research Assistance Program (2019) in the Incheon National University
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2019R1G1A1007832]
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The paper presents a wireless power transfer system for IoT devices and sensors in smart grid applications, utilizing repeater coils to enhance transfer distance and provide power to attached loads. Identical high-quality factor coils were designed to reduce skin effect, achieving total efficiency of 51.7% with power and voltage delivery to each load.
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 x 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.
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