A Wireless Charger for Hand-held Mobile Devices

The goal of this bachelor project is to implement a wireless charger circuit. Recently, wireless power transfer (WPT), in particular, wireless charger, becomes more popular. WPT utilizes time-varying (alternative) electromagnetic field to transfer electric power to primarily hand-held mobile devices such as smart-phones, smart-watches, electric toothbrushes, implantable medical devices such as pacemakers, and . . . . In general, WPT is beneficial for devices where wired chargers are inconvenient. Wireless chargers are primarily split into groups; namely: 1. Radiative, power beaming or far-field technique: In this approach, power is transferred by microwave beams.It is primarily applicable to long-distance power transfer such as wireless drone aircraft. This method is not the focus of this project. 2. Inductive coupling or near-field technique: Also called non-radiative approach. In this method, the power is transferred exploiting time-varying magnetic field. Fig. 1, depicts a simplified block diagram of this approach. This method is the focus of this bachelor project.

Assignment

The key project specifications are listed as follows: 1. WPT protocol: preferably Qi, thus frequency of operation is around 80-300 kHz; 2. Transfer efficiency: around 60%; 3. TX output power: around 5-10 W; 4. RX output power: around 5 W; 5. Physical distance between TX and RX as high as possible.

Requirements

A bachelor project aiming for a "Wireless Charger for Hand-Held Mobile Devices" is successfully designed, realized, measured and defended by four talented and hard-working bachelor students, Louis Marting, Joram van der Velden, Jordy van der Horst, and Nandor Toth. They split the project into a transmitter (TX) and a Receiver (RX) parts.

The measured transmitter efficiency is as high as 93% for the distance of 2 cm. The calculated and tested total system efficiency for a range of 1.75 cm is better than 71.5% while generating 5 W DC power.

There is a clip that demonstrates this wireless charger prototype. The clip is edited and uploaded by Antoon Frehe.

This bachelor thesis is supervised by Marco Pelk, Masoud Babaie, and Morteza Alavi.

Contact

dr. Morteza Alavi

Electronic Circuits and Architectures Group

Department of Microelectronics

Last modified: 2019-01-24