Conversores CC-CC SEPIC, Ćuk e Zeta com célula de comutação de capacitor flutuante multinível.

Abstract

In recent years, multilevel power converters have been the focus of research due to their advantages compared to traditional two-level topologies, such as better harmonic performance, filter reduction, lower voltage stress on components, and higher power processing capability. Following this trend, this work proposes two SEPIC DC-DC converters, two Ćuk DC-DC converters, and two Zeta DC-DC converters, all composed of asymmetric totem-pole switching cells with multilevel f lying capacitors. These structures are obtained by replacing one switch/diode leg of the traditional two-level asymmetric switching cell with a similar multilevel flying capacitor cell. A generalized structure of the flying capacitor switching cell for k switches is presented. Additionally, an operational analysis of the proposed converters is conducted, accompanied by simulation and experimental results to validate the theoretical approach.