Universal Modeling Method and Reactive Power Optimization for Phase-shift-modulated Resonant Switched-Capacitor Converters

This paper proposes a universal modeling method and a reactive power optimization strategy for phase-shift modulated resonant switched-capacitor converters (RSCs). Compared with the previous steady-state modeling method, only the node voltage between the resonant tanks is needed and the analysis process for different operation states is no longer required. Furthermore, the universal model reflects not only the steady-state characteristics but also the frequency characteristics of phase-shift-modulated RSCs, which can be used to analyze the reactive power directly. In order to minimize the reactive power and thus improve the overall efficiency, an optimized modulation strategy by adopting enumerated algorithm is presented with the help of the proposed universal modeling method. An experimental prototype was built to verify the validity of the model and the effectiveness of the optimized phase-shift modulation strategy.