Common Ground Buck Type Five-Level Transformerless Inverter With Less Stress

The presented brief introduces a new switched capacitor-based transformer-less inverter (SC TLI). This SC TLI configuration is based on a reduced switch count employing only six switches, one of which is a bidirectional switch. It uses only one power source and two SCs to obtain a five-level output voltage. A level shift pulse width modulation (LS-PWM) based simple logic circuit controls SC TLI. It also handles capacitor charging and discharging during operation for each fundamental cycle. The SCs are self-balanced and do not require any specific controller. Further, detailed comparative studies are performed with existing arts of literature to determine the merits of the SC TLI. A prototype SC TLI model is made in the laboratory. The experimental results from the laboratory prototype validate the feasibility of the SC TLI. The voltage, current stress, and junction temperature across the power component are analyzed for the SC TLI design. Finally, this SC TLI performance characteristic is presented for different loading conditions.