Design and characterization of a modular GaN-based power stage for automotive applications

This thesis presents the design and characterization of a modular power stage using Gallium Nitride (GaN) transistors for automotive three-phase inverter applications. The project was carried out as an internship at Ideas & Motion, in collaboration with the Politecnico di Torino, with the aim of creating an efficient, compact and reliable inverter system suitable for high-power demands in electric vehicles. GaN technology was selected due to its high voltage capability, fast switching speed and superior efficiency compared to traditional silicon-based systems, making it ideal for the rigorous requirements of automotive power electronics. The work begins by examining the technological and environmental motivations driving the electrification of transportation, as well as the fundamental principles of power conversion and the advantages of wide-bandgap devices. A detailed breakdown of the GaN-based inverter follows, describing the individual subsystems and their integration within overall design. The focus then shifts to the design process, covering critical decisions in component selection, circuit architecture and PCB layout. Finally, the testing phase, where the inverter’s performance is validated, is discussed to assess its operational stability, efficiency and suitability for automotive applications. This study combines theoretical analysis with practical implementation to showcase the potential of GaN technology to meet the stringent demands of automotive systems. The results highlight the inverter’s capability to manage efficiently high voltage and high current levels, contributing to the broader transition towards sustainable electric mobility.