Desenvolvimento de um carregador para veículos elétricos leves utilizando dispositivos de Wide Bandgap

Abstract

This master thesis presents the development of a light electric vehicles charger using Wide-Bandgap (WBG) devices. The developed charger is composed of two stages, one rectifier (AC-DC converter), with input current power factor correction (PFC), and another DC-DC converter, which is responsible for galvanic isolation between load and grid, and allows the ouput voltage and current control. The topologies under study at this work are the Totem Pole PFC for the AC-DC stage, and the Half-Bridge DC-DC with current doubler for the DC-DC stage. Both topologies are studied in detail, with the main focus on the application of GaN technology, regarding its advantages and disadvantages. Therefore, design and analysis of the converters are presented, with the development of a loss estimation methodology for GaN switches. Also, it is shown the design of a halfbridge module to operate up to 360 W of power, used in both converters. Simulation and experimental results are presented to validate the theoretical analysis.