Single-Phase Hybrid Boost AC-DC Converters With Switched-Capacitor Cells and Reduced Switch Count

This article proposes new configurations of hybrid boost rectifier topologies with switched-capacitor cells to reduce the number of switches. The proposed converters use switched-capacitor voltage multipliers to increase the voltage gain of the conventional boost rectifier and reduce the voltage stress across the switches. The new topologies are able to achieve output voltage regulation and a near unity input power factor. The proposed integration of the boost switching cell and the ladder cell reduces the number of semiconductor devices of the conventional hybrid boost rectifier. A generalized topology is presented and two variations of the topology are studied within greater depth. The theoretical analysis of these topologies is performed and evaluated experimentally through a 1-kW prototype with 220 V ac input and 800 V dc output voltages. The converter presented a maximum efficiency of around 97.9% and input power factor above 0.99.