Análise dos conversores abaixadores: Buck quadrático e Buck quadrático híbrido

Abstract

This work presents the study, and design of the following non-isolated DC-DC converters: quadratic buck converter (QBC) and hybrid quadratic buck converter (HQBC). The converters were analyzed qualitatively and quantitatively in continuous conduction mode (CCM), identifying their operating stages, as well as the voltage and current relationships required for sizing the energy storage elements and semiconductor devices. A unique feature of this work is the proposal of a new methodology for calculating current and voltage ripples in energy storage components, based on the converter's output parameters. This methodology eliminates the need to arbitrate values for calculating high-frequency ripples in energy storage components. Therefore, their values are naturally obtained from the converter analysis. The converters are then evaluated through computer simulation with the Ltspice program, and the theoretical analysis is validated. Finally, two prototypes were built and experimentally tested. The experimental results are consistent with the theoretical evaluation and demonstrate that the methodology is feasible.