Aprimoramento do desempenho em microinversor Cuk com Indutores chaveados

Abstract

This work starts from a already existing Cuk with switched inductors microinverter topology. From that, four techniques that could be applied to improve the circuit were studied: converters parallelism, inductors coupling and multiphase. The converters parallelism is accomplished by mounting two converter boards in parallel, with the aim of decreasing the current stresses on the components and raising the microinverter efficiency. After that, the inductor coupling aims to reduce the number of magnetic elements of the circuit, which is done by coupling two or more inductors in only one core. Finally, the multiphase technique is to offset the switch commands by 360 degrees divided by the number of parallel components, thus improving the ripple of the current at the inverter output. The techniques of converter parallelism and inductor coupling were applied in experimental tests and their results and analysis are presented in this work. The multiphase technique was applied only in a computer simulation environment.