Zero Photovoltaic Leakage Current Boost Inverter Using Modified Symmetrical Switch Common Ground Topology with Lower Device Stress

The transition to clean photovoltaic sustainable generation sources has motivated several developments in required power electronics interface systems. The conventional solution is based on two cascaded conversion stages, leading to reduced efficiency, inevitable leakage currents, and/or a high number of required components. Another solution is the use of integrated two-stage solutions suffering from asymmetrical switch structures, discontinuous input side currents, and/or complex modulation and control requirements. This paper presents a modified configuration with symmetrical six switches based on the common ground boost inverter solution. Furthermore, the proposed solution presents a continuous input side current and a simple modulation strategy. Moreover, the proposed CG topology offers a reduction of the current stress on the power switch by diverting the load current away from the power switch during the inductor charging. The operation, modulation, and control of the developed solution are presented in the paper, including comprehensive performance comparisons with boost inverter solutions in the literature. Simulation and experimental prototype-based results confirm the advantages and superiority of the proposed topology over existing topologies.