Duty compensated reduced harmonic control for a single-phase H-bridge PFC converter

A power factor correction (PFC) circuit is an essential requirement for AC-DC conversion to meet the strict grid quality standards. High efficiency and increased power density requirements have driven the industry towards bridgeless PFC circuits as a viable solution for front end rectification. Inherent electro magnetic interference (EMI) issues of an H-Bridge PFC topology has hindered the adaptation of this circuit. In this paper, a duty compensation method is proposed to reduce the harmonic content generated by switch node of an H-Bridge topology. The proposed control technique reduces the generated harmonics without addition of any hardware components helping to meet high power density requirements. A 1kW SiC-based laboratory prototype is designed to verify the proposed control technique. The experimental results show that an input power factor of 0.99 with a conversion efficiency of 96.5% and total harmonic distortion (THD) of 2.05 % can be achieved.