Desenvolvimento de conversores eletrônicos de energia com estágio único e elevado fator de potência para acionar e controlar iluminação de estado sólido

Abstract

This work proposes single, non-isolated electronic systems for supplying power LEDs using the charge-pump and bridgeless concepts. These topologies have operating characteristics similar to the double boost converter, even though the converter operates in a doubling manner, the bus voltage is below the doubling voltage. Both concepts are related to the topological configuration based on the integration of a converter without rectifier bridge in the input stage with a halfbridge inverter at the output, featuring a single stage system. The charge-pump setting is used to reduce the current ripple of the LEDs. The principle of operation of the proposed converters, which in a permanent regime includes two modes of operation, will be presented and analyzed. A design methodology, as well as simulation results will also be presented in order to verify the operational characteristics of the system. In this work, a switching frequency of 75 kHz will be used. The supply voltage is 127 V and the load consists of 6 LEDs connected in series with an output voltage of 60 V and a total power of 60 W.