A Family of Switched-Resonant Converters with Wide Conversion Ratio and Controlled Sourcing Features for Volume-Sensitive Applications

In this paper, a family of switched-resonant converters 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 paper that modify the charge balance of the flying capacitor. By that, the sourcing as well as the efficiency characteristics of the converter can be shaped to peak at various conversion ratios. A generalized methodology is presented to describe resonant converters with multiple operation modes as a two port which is then used to analyze several operational modes of the presented topology. Experimental results 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 5-W prototype.