Projeto e análise teórico-experimental de um retificador monofásico com correção do fator de potência

Abstract

This completion of course work presents a theoretical and experimental analysis of a boost converter with power factor correction. Initially, after a bibliography revision, a study of converter operation is presented, beholding the main theoretical form waves of the DC-DC converter operating as power factor pre-regulator. Based on the theoretical analysis performed, the project and the definition of elements that compose the converter circuit are showed. A state space modeling is presented to obtain the representative model of the inductor current and the model of output voltage, to obtain the response features of variables to be controlled. These models are utilized in the controller’s project, which are part of initial procedure of controllers project presented, composed of a proportional controller in the current control and a proportional-integral controller in the current and voltage control. After, the simulation results concerning the project methodology are showed and compared with the IEC 61000-3-2 standard. Both in simulation and in experiments, the boost converter operates in continuous conduction mode, with fixed switching frequency (40 kHz) and with the control implemented digitally. The obtained experimental results with the prototype implementation are presented and compared with simulation; in order to validate the chosen methodology. At end, in the annexes appear: (i) the obtaining of digital controllers by the discretization method; (ii) the presentation of prototype implemented, with photos and the circuits utilized; (iii) the code implemented in the digital signal microcontroller (dsPIC); (iv) the code developed in the M-Function of MATLAB/Simulink® to realize the digital control of converter in simulation.