THANT, M. Development of a Wireless Charging System Using Resonant Inductive Coupling and Simulation [online]. Brno: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. 2025.
The presented thesis deals with the topic of wireless power transfer (WPT). The first part of the thesis focuses on the theoretical analysis of WPT, its types, possibilities and limitations. It discusses the possible variants of wireless transmission, namely inductive, resonant and radiative. In the next part, the student discusses the design theory of such a system using numerical modelling of both the power transfer itself in Ansys Maxwell 3D and the associated circuits - exciter and inverter - in LTSpice. The influence of coil shape, size and arrangement, frequency, the use of magnetically conductive materials, and compensation in series and parallel versions are discussed in detail. Finally, it discusses the theoretical design of a complex wireless charging circuit, i.e. both the electromagnetic part and the electronics circuit design. The proposed solution is verified in accordance with the assignment at the level of numerical simulations. The thesis has 56 pages, which slightly exceeds the recommended length for a bachelor thesis. The student worked independently and continuously during the semester. In terms of presentation, the thesis is at a satisfactory level; the text is inconsistent in places and lacks detailed presentations of the results obtained to demonstrate the appropriateness of the proposal. In terms of formal level, the thesis could be improved, e.g. list of references used, uneven quality of figures. I also found quite a few typos and clumsy wording in the thesis. The result of the thesis, i.e. the analysis and design of a specific WPT solution, is applicable for practical implementation. I consider the assignment completed. In view of the above, I score 80 points.
In the thesis, the student was tasked with exploring various types of wireless charging. She compared different topologies and provided information about the basic parameters of wireless power transfer. The thesis includes a simulation in Ansys HFSS, where the student models and compares the dependence of the coupling coefficient on the shape, shielding, and size of coils used for wireless power transmission. For resonant wireless charging, the student evaluates the advantages and disadvantages of basic topologies. Finally, simulations of the Serial-Serial (SS) topology were conducted using LTspice. For driving the transmitting serial resonant circuit, a driver circuit based on a half-bridge configuration with IRS2153D transistors was chosen. On the receiving side, the student selected a two-way (Graetz bridge) rectifier, analyzing performance at various coil distances and with variable resistive loads. In general, work shows formal shortcomings. Such as inconsistent spaces for units after numbers. Different formatting of references. The images are poorly described, and the reader may not know what time course belongs to a given quantity. The text does not connect at all between chapters, and the reader gets lost in the issue. In the end, I am missing some demonstrable results from simulations. Final evaluation: Grade: C (75 points) The thesis meets the requirements of a bachelor-level project but would benefit better processing. I recommend the thesis for defense.
eVSKP id 169687