Single-stage switched-resonator converter topology with wide conversion ratio for volume-sensitive applications

In this study, a switched-resonator converter with high efficiency over a wide conversion ratio range is introduced. Inspired by the gyrator resonant switched-capacitor concept, the new topology provides high efficiency over wide and continuous range of conversion ratios using a single resonator. This is enabled by new modes of operation (switching sequences) developed and analyzed in this study, that modifies the charge-balance of the flying capacitor. By that, the efficiency characteristics of the converter can be shaped to peak at various conversion ratios. A generalized methodology is presented to describe resonator-type converters with multiple operation-modes as two-ports, which is then used to analyze three showcase operational modes of the presented topology. Experimental results of the three modes validate the developed theoretical model, and demonstrate the superiority of the concept in terms of efficiency (over 10%) and current-sourcing capabilities (over 80%) using a compact 5W prototype.