GaN-Based Half-Bridge Converter Assessment for Capacitive Wireless Power Transfer System

This thesis presents a comprehensive study on the design and implementation of a Capacitive Wireless Power Transfer (CPT) system for an innovative charging device. Recognizing CPT as a promising and versatile alternative to conventional wired charging, this work aimed to leverage its inherent advantages within the evolving landscape of Wireless Power Transfer (WPT). The core of this research involved the meticulous conceptualization, detailed design, and practical engineering of a CPT-based charging solution. The work began with analytical calculations to define the optimal parameters for the capacitive coupling elements, resonance frequencies, and power transfer capabilities. These initial calculations guided the selection of an appropriate power converter topology, specifically a half-bridge converter, chosen for its suitability in high-frequency power conversion. The design process focused on optimizing the converter's performance for high-frequency operation. Although the converter utilized advanced semiconductor technology for its inherent high-speed switching capabilities, the emphasis of this work lies in how these capabilities were integrated and managed to achieve the desired system performance. Following the detailed design phase, extensive simulations were rigorously conducted to validate the theoretical calculations and assess the performance of the proposed CPT system. These simulations were instrumental in evaluating key operational parameters such as power transfer efficiency for the coupling distance and the analysis of critical voltage and current waveforms within the resonant circuit, but also for the selection of real components that could be commercially implemented. The results obtained from these simulations unequivocally demonstrate the efficiency and performance achieved through the design. They provide clear validation of the calculated parameters and designed components, highlighting the practical viability and robust operation of the developed CPT charging device. In conclusion, this thesis provides a robust and validated framework for the implementation of CPT systems with good efficiency. The work, encompassing detailed theoretical calculations, comprehensive circuit design, simulation, and thorough analysis of the obtained results, underscores the transformative potential of this CPT approach in advancing wireless power transfer capabilities for a wide range of future charging applications.