Dual-buck full-bridge inverter

A dual-buck full-bridge inverter (DBFBI) is proposed. The inverter solves the shoot-through problem of each bridge leg which exists in bridge-type inverter, so the dead time between the switches neednpsilat be set, and thus waveform quality of the output voltage and reliability of the inverter can be improved. The DBFBI also increases the input-voltage utilization rate and reduces the voltage stresses of switches and diodes compared with the dual-buck half-bridge inverter (DBHBI) under the same output-voltage condition. All switches and diodes operate at each half line cycle, and the freewheeling current flows through the independent diodes instead of the body diodes of the switches, so the efficiency can be increased potentially. The operating principle, stability and relative stability analysis, and design guidelines and example are provided in this paper. A 1 kVA DBFBI has been established and tested. Experimental results verify the theoretical analysis.