Projeto e implementação de um conversor estático de potência para correção ativa do fator de potência de uma fonte chaveada

Abstract

The advance of power electronics in recent years has provided the widespread use of electronic equipment. However, these devices can contribute to the reduction of power quality. In this way, studies were also developed aiming to solve these problems, such as active correction of power factor. Therefore, the present work aims to study and implementation of a DC-DC converter for active correction of a switching power supply’s power factor. The project is geared for a correction stage application of the power factor correction in an electronic ballast that drives a low-pressure discharge lamp. To reach this objective, a study on harmonics and the methods used to reduce their effects is conducted, alongside the analysis the existing rules of this area. It follows with a review of the operation of the DC-DC converters and their basic topologies. The switched converter leads the need to design a low-pass filter at its input. It also makes the study and design of magnetic elements to be used in the implementation. Throughout this paper, it is presented the theoretical results in order of presenting the results obtained from the prototype simulation and implementation, at the end. The simulation results meet the requirements of the standard. The simulation results meet the requirements of the standard. The circuit implemented presented according to the expected behavior and the experimental results confirmed the design methodology presented, except for the converter input current, which presented a significant error in measurement. However, this error does not compromise the project presented.