Seyed Hossein Aleyasin

Ph.D. candidate in Ingegneria Elettrica, Elettronica E Delle Comunicazioni , 39th cycle (2023-2026)
Department of Energy (DENERG)



Research topic

Reliable WBG power electronics with diagnosis and prognostics for future eMobility.


Research interests

Power systems, Power converters, Electrical machines and drives


Power electronics is one of the most impactful disciplines in the future electrification of transport and for this reason the last few years have seen a strong increase in investments by the automotive sector which have led to the development of new technologies. The development of new families of semiconductors called "wide-bandgap" (WBG), making use of silicon carbide (SiC) or gallium nitride (GaN) to replace the classic silicon (Si), now make it possible to create converters with and power densities unimaginable just a few years ago. The WBG devices (SiC and GaN) have shown unprecedented performance with respect to the conventional Si-based devices in terms of switching frequency and efficiency. However, the dramatic increase in performance has not been matched by an equally dramatic increase in reliability. Often the use of wide bandgap semiconductors has been found to be the cause of unexpected failures due to increased stress on the components and the still imprecise manufacturing process. The objective of the PhD thesis activity is to study, design and implement high efficiency and reliability traction, with the use of advanced diagnostic solutions. In particular, we want to develop an inverter able to evaluate the state of health of power components such as: semiconductors, capacitors, interconnections, electric motor and battery. Various solutions suitable for diagnostics have been previously presented in the literature, however many are inadequate to be implemented on a traction converter. For this reason, the thesis aims to find diagnostic solutions suitable to be implemented on a traction converter taking into account the technological and cost constraints imposed by the automotive sector.