Desenvolvimento de conversor com células a capacitor chaveado

Abstract

It is up to the electrical engineering field to provide solutions that satisfy a market that has been seeking, with significant increase in intensity in recent years, the miniaturization of circuits, efficiency and high power density. In this sense, traditional power converters, such as the well known buck and boost topologies, present some problems and new topologies, such as switched capacitor converters, emerge as alternatives. Hybrid converters are those that combine both topologies, and present advantages over both the conventional (buck/boost) and the purely switched capacitor topologies, in which the main advantages are the easy regulation of the output voltage, the low blocking voltage and the possibility of adding more switched capacitor cells, further increasing the static voltage gain. The present work, after a detailed description of the operation of switched capacitor cells and presentation of three bidirectional hybrid converter topologies available in the literature, presents a hybrid voltage boost power converter topology, which was implemented both in simulation and in a prototype. The converter was designed to operate with an input voltage of 50 V, an output voltage of 200 V, and a nominal power of 200 W. The prototype presented as experimental results, for an average input voltage of Vimed = 49.7 V, an average input current of Iimed = 4.49 A, and an average input power of Pimed = 220 W, an average output voltage of Vomed = 194 V, an average output current of Iomed = 982 mA, and an average output power of Pomed = 189 W. The hybrid step-up converter prototype therefore obtained an efficiency of η = 85.9% and a voltage gain of 3.9.