Novel Virtual-Ground Single-Stage Single-Inductor Transformerless Buck–Boost Inverter

Abstract

In this article, a novel single-phase single-stage transformerless inverter is proposed for grid-tied and standalone applications. The proposed inverter has low leakage current and can perform both buck and boost functions. Furthermore, compared to the conventional state-of-the-art buck–boost inverters, it can achieve high power density because the magnetic volume is reduced significantly. In addition, high power conversion efficiency can be realized because only one switch operates at a high frequency. Moreover, there is no need for inserting high-frequency dead-time between the switches because only one switch receives high frequency and all other switches receive line frequency signals. In order to verify the performance of the proposed topology, a laboratory prototype is designed for 500 W, and the experimental results are provided as well.