RELIABLE HYSTERESIS CURRENT CONTROLLED DUAL BUCK HALF BRIDGE INVERTER

摘要

A highly efficient and reliable topology ― dual buck half bridge inverter (DBI) is introduced. The existence of discontinuous conduction mode (DCM ) operation state requires the bias of inductor current for DBI implemented with linear controllers like ramp comparison SPWM (RCSPWM) controllers. A novel operation scheme for DBI and a hysteresis current controlled dual buck half bridge inverter (HCDBI) are proposed. The bias current required by RCSPWM DBI is eliminated and conduction losses are dramatically reduced. HCDBI has greatly improved the modulation performance in DCM region for the benefit of its excellent command tracking capability. The operational scheme and control strategy are presented. Power losses of the conventional half bridge inverter (CHBI) and HCDBI are compared with mathematical computation, and experimental verification is also executed. Both calculational and experimental results verify that HCDBI has a superior switching performance over CHBI. Its excellent high frequency operational capacity provides another access to realize high frequency operation of inverters.