A Novel Switched-Capacitor Converter With High Voltage Gain

Abstract

In this paper, a novel topology of switched-capacitor converter is proposed. Compared with the existing switched-capacitor topologies, such as the Dickson-based switched-capacitor converter or the ladder switched-capacitor converter, it limits both voltage stress and current stress of components under lower level, which reduces the volume of capacitor banks and the conduction loss. These characteristics can help high-power density and high-efficiency design, especially in high-voltage-gain applications. The phase shift modulation strategy corresponding to the proposed switched-capacitor converter is also presented in this paper. With phase shift modulation, voltage gain can be adjusted as continuous value. The voltage regulation ability makes up the defect of conventional switched-capacitor converters, and the ZVS operation of all the switching devices is also achieved with the proposed modulation method so that the WBG devices can play more strength in the converter with higher switching frequency. The derivation of the circuit topology and phase shift modulation will be introduced in this paper. The steady analysis and performance comparison will prove the advantage of the proposed converter. A 600-W prototype is built, and the experiment results are presented to validate the proposed converter.

Keywords

• High-voltage-gain converter
• switched-capacitor converter
• high power density
• high efficiency
• phase shift modulation
• voltage regulation ability