Dual Buck Full-bridge Inverter

In order to avoid shoot-through problem of the power devices in bridge legs and improve the utilization of DC input voltage,dual buck full-bridge inverter(DBFBI) was proposed based on full-bridge inverter and dual buck half-bridge inverter. It has the advantages of no shoot-through problem,high-utilization of DC input voltage,high-efficiency and optimum selection of the freewheeling diodes. By adopting half cycle modulation,the switching losses and conduction losses of the power devices are reduced. The operation modes of the topology under the half cycle modulation were analyzed. The relations of input voltage and output voltage in discontinuous conduction mode and continuous conduction mode were given out. DBFBI with hysteresis current control was designed. The half cycle operation mode was achieved by the design of control logic. Both the simulation and experimental results verify that DBFBI has a good sinusoidal output waveform and fast dynamic response performance.