Contribuição à análise, simulação e implementação de conversores CC/CC e CC/CA.

Abstract

This work seeks to contribute to the study of static DC / DC and DC / AC power converters. Almost resonant converters are analyzed and simulated with switching to ula voltage, the latter with laboratory implementation. The analysis of inverters with forced switching shows that some structures, similar to almost resonant configurations, operate with non-dissipative switching. The main characteristic parameters of operation and design are presented, in the form of abacuses, for the analyzed inverters and for an almost resonant converter with switching to zero voltage of the "buck" type. The comparative analysis of the configurations of basic and modified inverters, aiming at reducing the overvoltage in the components, shows that, from the energy point of view, the structure that presents the best characteristics is a configuration with non-dissipative switching. As a tool to aid the analysis of converters, a new global numerical simulation program, called SAECE, was presented, which was developed using the theory of resistive networks and a structured programming technique. The program is capable of simulating converters to diodes, thyristors, BJTs and IGBTs, without prior knowledge of their operation. The practical implementation of the almost resonant converter with zero voltage switching uses the IGBT as a key, proving the feasibility of making a dual thyristor to IGBT. For such a converter, the experimental and simulation results are compared.