Output characteristics analysis of phase module combined three-phase single-stage PFC converter based on full-bridge structure

Output characteristics of phase module combined three-phase single-stage PFC converter based on full-bridge structure are analyzed in detail. The module combined three-phase single-stage PFC converter is the combination of three single phase full-bridge PFC converters, whose topology and operation principle are presented. Two times line frequency output voltage ripple under balanced and unbalanced three- phase grid condition is analyzed. A comprehensive analysis of the six times line frequency output voltage ripple is done by considering the high frequency component in current. By analyzing the bandwidth of the open loop transfer function in different situations, the phase module combined PFC converter is proved to have a faster dynamic response than a single phase module. Finally, a 1.8kW prototype is built to verify the theoretical analysis.