Inversores a duplo capacitor flutuante integrado a uma fonte de tensão CC elevadora de tensão.

Abstract

Multilevel converters with a reduced number of components have several significant advantages, such as higher power density, better distribution of components, and a reduction in harmonic distortion in the output signal. In the search for simpler topologies, this work proposes a seven-level topology, as well as the adaptation of two other topologies with five and nine levels, utilizing a dual floating capacitor. Furthermore, a flyback converter is used to maintain the voltage of the floating capacitors at desired values, facilitating the modulation control of the inverter. Among these configurations, the increase in the number of levels occurs only with the addition of a bidirectional switch and/or by changing the voltage ratio of the floating capacitors. The results obtained from simulations and experimental tests show that stabilizing the voltage of the floating capacitors allows for a reduction in the complexity of the converter, eliminating the need for sensors to implement the switching control. Additionally, the results also indicate that the proposed configurations yield better performance according to the used performance criteria.