A High-Gain Virtual-Ground Low-Stress Single-Phase Single-Stage Inverter With Input and Output Current Ripple Cancellation

To overcome the challenges faced by inverters applied to photovoltaic systems, such as wide-range input voltage variation, leakage current, high-frequency current ripple, etc. This paper proposes an improved single-stage inverter topology based on magnetically coupled inductors, which integrates the functions of a full-bridge buck and a dual floating boost converter, along with a time-multiplexed modulation strategy. The proposed inverter achieves single-stage power conversion and higher efficiency through a time-multiplexed modulation strategy with reuse switches and passive components. Furthermore, by incorporating the advantages of the dual floating boost structure—such as high voltage gain and low voltage/current stress—the proposed inverter exhibits superior efficiency and wider voltage regulation range compared to other single-stage inverters. The optimized and multi-functional utilization of the integrated coupled inductors further enhances power density, improves leakage current suppression, and reduces both input and output current ripple. The operating principles and modulation methods of the proposed inverter are analyzed. In addition, voltage gain characteristics, component stresses, loss analyses, and parameter designs are also presented in detail. Then, the leakage current suppression mechanism of the proposed inverter is analyzed, and a comprehensive comparison with relevant topologies is provided. Finally, the performance of the proposed inverter is verified on a 500W prototype.