Comprehensive Analysis of Single-Phase Full-Bridge Asymmetrical Flying Capacitor Inverters

This paper presents a comprehensive analysis of single-phase full-bridge asymmetrical flying capacitor inverters under distinct capacitor voltage values. The asymmetrical operation is explored in order to increase the number of output levels for the same number of semiconductors. A formation law for the flying capacitors' voltages is proposed according to the desired number of output levels. The voltage regulation of the flying capacitors is carried out using the charge regulation analysis. The modulation strategy is also verified to overcome the inverter unbalance problem. Simulation and experimental results are included to demonstrate the performance of the proposed structures.