Adaptive Power Sharing and Switching Frequency Control for Power Loss Optimization in WBG/Si Hybrid Half-Bridge Converters

The optimization of switching frequencies and the power-sharing ratio between the silicon (Si) phase and wide-bandgap (WBG) phase are critically important for the efficiency improvement and safe operation of the WBG/Si hybrid half-bridge (HHB)-based power converters. In this article, a novel adaptive power sharing and switching frequency control for power loss optimization in WBG/Si HHB is proposed. It is based on intelligence particle swarm optimization (PSO), especially suitable for applications with time-varying operation current. The PSO approach only evaluates the fitness values to seek the best optimal parameters without requiring an accurate power loss model and additional hardware components. Therefore, the proposed method can be easily implemented and adapted to various working conditions. A 3-kW prototype of the Si/SiC HHB-based single-phase inverter is built to validate the proposed approach. In comparison with the fixed frequency and power-sharing ratio, the proposed method achieves an 18% maximum total power loss reduction while maintaining the same power quality performance.