Single-Tube and Multi-Turn Coil Near-Field Wireless Power Transfer for Low-Power Home Appliances

Aqeel Jawad,Sadik Gharghan,Mahamod Ismail,Mahmood Abu-AlShaeer,Haider Jawad,Rosdiadee Nordin

doi:10.3390/en11081969

Abstract

Single-tube loop coil (STLC) and multi-turn copper wire coil (MTCWC) wireless power transfer (WPT) methods are proposed in this study to overcome the challenges of battery life during low-power home appliance operations. Transfer power, efficiency, and distance are investigated for charging mobile devices on the basis of the two proposed systems. The transfer distances of 1–15 cm are considered because the practicality of this range has been proven to be reliable in the current work on mobile device battery charging. For STLC, the Li-ion battery is charged with total system efficiencies of 86.45%, 77.08%, and 52.08%, without a load, at distances of 2, 6, and 15 cm, respectively. When the system is loaded with 100 Ω at the corresponding distances, the transfer efficiencies are reduced to 80.66%, 66.66%, and 47.04%. For MTCWC, the battery is charged with total system efficiencies of 88.54%, 75%, and 52.08%, without a load, at the same distances of 2, 6, and 15 cm. When the system is loaded with 100 Ω at the corresponding distances, the transfer efficiencies are drastically reduced to 39.52%, 33.6%, and 15.13%. The contrasting results, between the STLC and MTCWC methods, are produced because of the misalignment between their transmitters and receiver coils. In addition, the diameter of the MTCWC is smaller than that of the STLC. The output power of the proposed system can charge the latest smartphone in the market, with generated output powers of 5 W (STLC) and 2 W (MTCWC). The above WPT methods are compared with other WPT methods in the literature.

Highlights

Wireless charging has recently found its way into the commercial market for electric vehicle charging facilities, mobile phones, portable laptops, smart watches, and drones [1]
In the last 20 years, most mobile phones, portable laptops, electric vehicles, drones, and electronic devices have still been operating with batteries, despite their heavy weight, the nuisance of charging cables, and the long charging times
wireless power transfer (WPT) technologies have recently been developed for mobile electronic devices and electric vehicles to overcome the limitations of battery power transfer [2]

Summary

Introduction

Wireless charging has recently found its way into the commercial market for electric vehicle charging facilities, mobile phones, portable laptops, smart watches, and drones [1]. Mobile phones and laptop computers are two of the devices that use wireless power transfer (WPT) technology the most. In the last 20 years, most mobile phones, portable laptops, electric vehicles, drones, and electronic devices have still been operating with batteries, despite their heavy weight, the nuisance of charging cables, and the long charging times. Energies 2018, 11, 1969 and high-performance low-power system designs continue to drive the expansion of the market for mobile electronic devices. WPT technologies have recently been developed for mobile electronic devices and electric vehicles to overcome the limitations of battery power transfer [2]

Methods

Results

Conclusion