New topology for a single-phase buck-boost inverter

This paper presents a new single-phase voltage source inverter based on two Buck-Boost dc-dc. The Buck-Boost inverter is driven by two 180° phase-shifted dc-biased sinusoidal references. This new topology can generate an instantaneous output voltage higher or lower than the input dc voltage without an intermediate power stage or transformer. In this converter both Buck-Boost outputs voltages are used to feed the load in one differential connection. As a drawback, this topology presents an inherent nonlinear behavior due to its variable operating point. To overpass it a linearization scheme is proposed in this paper. Operation analysis and experimental results are included in this paper.