The upswing in electric vehicle (EV) demand has underscored the necessity for readily available charging infrastructure, further catalyzing the need for efficient power control mechanisms. Consequently, there is a persistent demand for reliable, compact, efficient, and lightweight power converters to support this infrastructure. Multiport converters (MPCs) have emerged as a promising solution, enabling the integration of multiple energy sources and loads within a single converter, thereby reducing system complexity, cost, and volume. Despite their growing importance, the thermal modeling and reliability assessment of isolated MPCs remain insufficiently explored in the existing literature. This study presents a comparative thermal and reliability evaluation of 10 isolated MPC topologies under identical operating conditions, with a fixed input voltage of 600 V and a total output power of 1 kW. Simulation‐based analysis reveals that the maximum junction temperature of power switches varies from ~25 to 88°C across different topologies, leading to significant variations in failure rates and mean time to failure (MTTF). Converters experiencing higher thermal stress exhibit reduced reliability, with failure rates increasing markedly as junction temperature rises. The study further correlates thermal stress with reliability trends through a standardized analytical framework and provides a comparative assessment of cooling strategies applicable to isolated MPCs. The results highlight the critical role of thermal management in ensuring reliable operation and improving the longevity of multiport power converters in EV charging applications.
Firdous et al. (Thu,) studied this question.