BSc thesis project proposal
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.
AssignmentThe 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.
RequirementsA 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.
dr. Morteza Alavi
Electronics Research Laboratory Group
Department of Microelectronics
Last modified: 2019-01-24