Transformer-less Switched-Capacitor Inverter for PV Application

This study proposes a single-phase switched-capacitor (SC) topology that eliminates the need for a transformer and incorporates a shared ground. The topology utilizes eleven switches, one diode, and three capacitors to generate a nine-level waveform. The key attributes of the proposed design include zero leakage current (LC), voltage boosting capability, reduced voltage stress, and self-balancing of capacitor voltage. Furthermore, there is no need for extra balancing circuits or sensors to ensure the equilibrium of capacitor voltages. A comprehensive examination of the circuit description and operating principle has also been conducted. Through a concise comparison, the proposed topology has been shown to outperform existing alternatives in terms of component count, voltage stress, and gain. The utilization of the simulation environment ensures the accuracy of the theoretical concept.