Design and Current-Sharing Study of the TL-Boost Power Unit Based on Discrete Devices in Parallel

The TL-Boost scheme utilizing parallel discrete devices has gained significant attention due to its cost-effectiveness and flexible power scalability. However, asymmetric design of interconnection structures in main power units could compromise the consistency of parasitic parameters across branches, resulting in unbalanced current distribution among parallel devices. This paper establishes a parallel parasitic parameter model based on practical commutation paths of TL-Boost converters, proposing an engineer-friendly multi-device parallel power unit architecture with practical applicability. Field-Circuit co-simulation reveals the mapping relationship between structural parameters and current-sharing characteristics, enabling quantitative evaluation of current distribution patterns. Furthermore, a prototype was developed and experimentally validated through double-pulse testing, demonstrating excellent current equalization performance. The proposed simulation methodology provides technical support for implementing discrete devices in medium/high-power converter applications.