Modelagem e análise da eficiência de um conversor CC-CC trifásico isolado baseado no retificador hybridge para carregamento off-board de veículos elétricos

Abstract

The growing adoption of electric vehicles (EVs) has driven the demand for the development of efficient and rapid charging systems. In this context, ultra-fast off-board chargers emerge as a critical solution, requiring high power levels and the ability to operate across a wide output voltage range to ensure compatibility with a variety of vehicle models and manufacturers in the automotive market. These charging systems are designed with a two-stage conversion process: an initial active AC-DC stage, followed by a high-frequency isolated DC-DC conversion. This work presents a topology for the isolated PWM DC-DC stage based on the hybridge rectifier, which has potential application in these chargers by offering an extended output voltage range and minimizing voltage stresses on the rectifier semiconductors. The mathematical analysis will detail the current and voltage waveforms in each component of the analyzed topology, as well as the development of equations for static gains and voltage and current stresses. Focusing on efficiency evaluation, methodologies for estimating losses in the semiconductor and magnetic elements of the converter will be presented. These methods are integrated into computational algorithms developed in MATLAB, which automate the calculation for various operating conditions, ensuring both accuracy and efficiency in obtaining results. The parameters derived from these theoretical analyses will be validated through computational simulations and the construction of an experimental prototype in the laboratory, ensuring the reliability of the developed models.