Switched capacitor boost inverter

TLDR: The proposed inverter allows gains higher than the unity and increases the approximated linear region of boost-based inverter, and in the proposed topology, the voltage stresses across the switches are reduced if compared with a traditional DBI.

Abstract: The differential boost inverter (DBI) generates an alternating differential voltage from two dc-dc converters. The instantaneous output voltage can be higher or lower than the dc input voltage, however DBIs exhibit nonlinear control-to-output behavior in large-signal sense. Furthermore, switched capacitor cells may operate as a gain multiplier in classical converters. The integration of switched capacitors (SCs) and differential boost inverters may offer an attractive solution to provide high static gain. Thus, the novel inverter is intended to be used in applications whenever an ac voltage larger than the dc link voltage is needed, as UPS or even renewable energy supplies. The inverter based on boost converter and on switched capacitors is proposed in this paper, which is designated as switched capacitor differential boost inverter (SCDBI). The proposed inverter allows gains higher than the unity and increases the approximated linear region of boost-based inverter. In the proposed topology, the voltage stresses across the switches are reduced if compared with a traditional DBI. Topology, operational principle, analysis, modulation and simulation results are included in this paper.