A new single-phase single-stage multilevel PFC AC-DC converter with flying capacitor

Abstract

A new ac-dc single-stage multilevel converter that can operate with standard phase-shift PWM due to its novel “flying capacitor” structure is proposed in this paper. In the paper, the operation of the converter is explained, the steady-state characteristics of the new converter are determined and its design is discussed. The feasibility of the new converter is confirmed with experimental results obtained from a prototype converter and its efficiency is compared to that of another multilevel converter of similar type.