A Family of Resonant Two-Switch Boosting Switched-Capacitor Converter with ZVS Operation and a Wide Line Regulation Range

In this paper, a family of resonant two-switch boosting switched-capacitor converters (RTBSCs) with ZVS operation and a wide line regulation range is proposed. Based on our previously proposed two-switch boosting switched-capacitor converters (TBSCs), only a small resonant inductor is added, while two bulky capacitor banks are replaced by two much smaller resonant capacitors. Furthermore, by operating RTBSC above the resonant frequency, the transistors are ZVS turned on and diodes are Zero-current-switching (ZCS) turned on/off. This eliminates the hard-switched phenomenon of TBSC, leading to reduced component size by increasing the operating frequency without sacrificing the overall efficiency. In addition, the voltage-gain range of the RTBSCs is largely expanded and hence the input-voltage range is increased remarkably for regulated output voltage applications. Meantime, the voltage stress on transistors and diodes remains low, equal to the input voltage. A 3X RTBSC prototype with maximum output voltage 150 V, maximum output power 140 W, and a peak efficiency of 98.3% was built. The analysis is verified by simulation and experimental results.