A 2:1 Capacitive Isolated Resonant Switched-Capacitor DC-DC Converter

Traditional transformers face issues such as high losses and limited power density at high switching frequencies. By utilizing capacitors for energy processing, the efficiency and power density are enhanced due to the superior energy density that capacitors provide. To reduce system weight and losses, this paper proposes a 2:1 capacitive isolated resonant switched-capacitor converter that employs capacitive isolation to block common-mode (CM) voltage and supports zero-current switching (ZCS) and zero-voltage switching (ZVS). These features significantly reduce switching losses and enhance efficiency and power density. A hardware prototype was developed, and experimental results validate the converter's soft-switching characteristics, demonstrating its potential for high-efficiency applications.