Evaluation of New-Generation IGBTs for Marine Applications

The transition from conventional internal combustion propulsion systems to electrified propulsion architectures is driving the increasing adoption of power electronic converters in marine applications. In these systems, efficiency, power density, and reliability represent key design requirements. This thesis, carried out in collaboration with Nidec ASI S.p.A., investigates the potential replacement of the currently adopted EconoPACK+ IGBT modules with a new generation of LV100 package IGBTs while maintaining a comparable product cost. To support this analysis, a MATLAB-based electro-thermal simulation tool was developed to evaluate semiconductor conduction losses, switching losses, and junction temperatures under operating conditions representative of the AD5000 marine drive platform. The model was validated through comparison with Infineon IPOSIM simulations and experimental double-pulse test measurements performed on the existing EconoPACK+ solution. The validated model was then used to assess the performance of the new LV100 IGBT technology. The obtained results show that the new devices provide lower semiconductor losses and improved thermal performance, enabling either higher efficiency at the same operating current or increased current capability while maintaining comparable loss levels. Furthermore, the possibility of operating at higher switching frequencies may contribute to reducing the size of external passive components, thus increasing converter power density. Finally, Silicon Carbide (SiC) MOSFET technology is discussed as a possible future development. Although SiC devices could further improve converter performance, their higher cost and the limited industrial experience in marine applications currently limit their adoption.