Conversores CC-CC boost-flyback com interleaving generalizado para aplicações de elevado ganho de tensão

Abstract

This work presents the qualitative and quantitative analyses describing the open loop operation principle of two integrated boost-flyback dc-dc converters with generalized interleaving. The first topology corresponds to the conventional solution, and a generalized mathematical analysis valid for any number of channels is carried out. A second topology is proposed to guarantee soft switching for all the circuit’s switches. Thus allowing the reduction of the switching losses and making viable its operation with higher values of switching frequency. Again, a generalized mathematical analysis is performed, thus providing a generic description of the converter’s operation for any number of interleaving channels. The main analyses results are initially validated by means of computer-aided simulations. For experimental validation purpose, a 500 W, 48 V input voltage, 400 V output voltage operating at switching frequency of 100 kHz was built. Potential application of the proposal are energy conversion systems requiring high voltage gain and high efficiency, such as photovoltaic, fuel-cell and small-scale wind energy systems.