用于多变比谐振开关电容拓扑的通用分段滞环控制策略

Poor voltage regulation capacity is the main limitation of the resonant switched-capacitor (ReSC) converter. To achieve voltage regulation, a universal segmented hysteresis control (SHC) strategy for ReSC converters with multiple voltage conversion ratios (VCRs) is proposed in this article. Based on the inherent discrete voltage gain characteristics of this type of converter, this article proposes applying a segmented hysteresis comparison logic in different gain ranges to achieve continuous voltage regulation and ensure zero current switching for high power conversion efficiency (PCE). The detailed operational principles and the output characteristics with SHC are analyzed. Moreover, as an example, the digital implementation of SHC in a multiratio-multiresonance switched-capacitor converter is described, and a prototype with 48-V input and 5–9.6-V (maximum 5 A) output is built and tested. The waveforms obtained from testing verify the correctness of the analysis and the dynamic performance, and the PCE is measured with a peak efficiency of 96.7%.