Retificador SP: topologia retificadora com compensação ativa de ondulação de baixa frequência sem capacitor eletrolítico

Abstract

The capacitance value necessary to obtain low ripple levels in converters is elevated, forcing the use of electrolytic capacitors, whose lifetime is limited and reduces the circuit’s durability. Although there are already capacitance reduction solutions, they have limitations as for the application, since they usually have high current ripple levels. This monograph details the study, analysis and modeling of a new rectifying topology applied to capacitance reduction, with low tension and current ripple levels, as well as high efficiency, allowing this way the general use application of this converter. A low frequency ripple active compensation rectifier was developed and implemented successfully. Simulations and experimental results obtained with the prototype are presented. The built prototype obtained the expected results, being implemented a step down converter in its output, obtaining ripple levels lower than 10%, being used a 20 μF capacitance. The output power is 85 W. The name SP is due to the operation dynamics, the series-parallel connection between the main capacitor and the input rectifier. The developed topology uses new working principles and had its patent pending under case number BR 10 2015 030296 7 in December 2015.