A novel hysteresis current controlled dual buck half bridge inverter

摘要

A high efficient and reliable topology-dual buck half bridge inverter is introduced. The existence of discontinuous conduction mode operation requires the bias of inductor current for DBI implemented with linear controllers like ramp comparison SPWM. A novel nonbiased current mode operation scheme for DBI and a hysteresis current controlled dual buck inverter (HCDBI) are proposed. The bias current required by RCSPWM DBI is eliminated and efficiency of the inverter is optimized. Comparison studies between conventional half bridge inverter (CHBI) and HCDBI based on losses computation and experiments are also executed. The results verify HCDBI's superior switching performance over CHBI. In addition, an inductor-coupled dual buck half bridge inverter is proposed and size of the filter inductors is reduced minimum.