A single-stage phase-shifted full-bridge AC/DC converter with variable frequency control

摘要

This letter presents a single-stage soft-switched full-bridge AC/DC converter for low-voltage/high-current output applications. A phase-shifted method with a variable frequency control is used to regulate the DC bus voltage and the output voltage of the single-stage AC/DC converter. The proposed circuit topology and control scheme exhibit superior performances (i.e. high power factor, high-efficiency, and ring-free features). Correspondingly, a laboratory prototype, 500 W 5V/100A AC/DC converter, is implemented to verify the feasibility of the proposed design.