Modelagem e validação experimental de um conversor CC-CC buck síncrono, projeto e simulação de um controlador por modo deslizante

Abstract

This work presents a proposal for Modeling and Experimental Validation of a Synchronous DC-DC Buck Converter and the Design and Simulation of a Sliding Mode Controller. Such converters are widely used in electronic systems, due to their high efficiency in converting voltages to a smaller amplitude. Four mathematical models are discussed to represent the dynamics of the circuit, differentiating them by their degree of fidelity. In these, the intrinsic resistances of the components and switching are considered or not. In order to validate them, a representative prototype for the converter was built, its components were measured and its response to step input was collected. The models were parameterized with the prototype values and numerically simulated based on the step input. The output voltages of the models were compared to that of the prototype, thus they were validated. Finally, the Sliding Mode Control technique was discussed, a controller was developed to regulate the converter output voltage to a determined level and its closed-loop behavior was simulated. The present work highlights the importance of computer simulation, in addition to unifying the main blocks of knowledge for developing a product in Electronic Engineering, namely: modeling, simulation, control and prototyping.