Dual buck-boost inverter

Abstract

Inverter is a definitive solution toward ac voltage regulation in a system having input dc voltage variation. This paper proposes, a novel single-stage single-phase buck-boost inverter called dual buck-boost inverter. It has the buck-boost function and requires only four active switches. It has no shoot-through worries and has improved reliability. In the proposed inverter, the body diodes of switches are disabled to conduct. Therefore, power MOSFETs can be used without worries of reverse recovery of body diodes. In this paper, a new PWM scheme is also proposed for the proposed inverter in which only one switch is switching at high frequency. As a result, the power loss can be reduced significantly and higher power transfer efficiency can be realized. Experimental results are provided to validate the capability of the proposed dual buck-boost inverter to regulate the output ac voltage for wide variation of input dc voltage.