Wireless Power Transfer Using Harvested Radio Frequency Energy with Magnetic Resonance Coupling to Charge Mobile Device Batteries

Neetu Ramsaroop,Oludayo O Olugbara

doi:10.3390/app11167707

Neetu Ramsaroop, Oludayo O Olugbara

Open Access

https://doi.org/10.3390/app11167707

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Journal: Applied sciences	Publication Date: Aug 21, 2021
Citations: 6	License type: CC BY 4.0

Affiliation: Durban University of Technology

Abstract

This research paper presents the design of a wireless power transfer (WPT) circuit integrated with magnetic resonance coupling (MRC) and harvested radio frequency (RF) energy to wirelessly charge the battery of a mobile device. A capacitor (100 µF, 16 V) in the RF energy harvesting circuit stored the converted power, and the accumulated voltage stored in the capacitor was 9.46 V. The foundation of the proposed WPT prototype circuit included two coils (28 AWG)—a transmitter coil, and a receiver coil. The transmitter coil was energized by the alternating current (AC), which produced a magnetic field, which in turn induced a current in the receiver coil. The harvested RF energy (9.46 V) was converted into AC, which energized the transmitter coil and generated a magnetic field. The electronics in the receiver coil then converted the AC into direct current (DC), which became usable power to charge the battery of a mobile device. The experimental setup based on mathematical modeling and simulation displayed successful charging capabilities of MRC, with the alternate power source being the harvested RF energy. Mathematical formulae were applied to calculate the amount of power generated from the prototype circuit. LTSpice simulation software was applied to demonstrate the behavior of the different components in the circuit layout for effective WPT transfer.

Highlights

The electronic product designers and engineers previously experienced power challenges in the form of continuously supplying power, recharging batteries, optimizing the location of sensors, and dealing with rotating and moving joints in electronic machinery. These challenges remain unresolved, new demands that arise from the increased use of mobile devices and the operation of these devices in dirty or wet environments mean that designers require new approaches for supplying power to electronic equipment [2]
It is practical to take into consideration the radio frequency (RF) energy harvesting system, the circuitry of the magnetic resonant system, and the signal strength of the receiving antenna (Yagi-Uda) with a frequency range from 30 MHz to 3 GHz
The prototype wireless power transfer (WPT) circuit included two copper coils of 28 AWG magnetic wire, because 28 AWG is more efficient regarding the transfer of power than 22 AWG with a higher inductance value (Table 2)

Summary

Introduction

The electronic product designers and engineers previously experienced power challenges in the form of continuously supplying power, recharging batteries, optimizing the location of sensors, and dealing with rotating and moving joints in electronic machinery. These challenges remain unresolved, new demands that arise from the increased use of mobile devices and the operation of these devices in dirty or wet environments mean that designers require new approaches for supplying power to electronic equipment [2]. Available online: http://www.allaboutcircuits.com/technical-articles/introduction-towireless-power-transfer-wpt/ (accessed on 29 August 2018).

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