Análise e projeto de um driver de led com tensão de entrada universal e variação de intensidade luminosa por meio de indutores variáveis

Abstract

This work presents the analysis and development of a LED driver, composed of a power factor correction (PFC) stage, integrated to the power control stage (PC). The PFC stage is responsible for adapt the driver input current waveform, aiming to obtain a high power and reduced total harmonic distortion (THD) rate, complying with regulatory standards. The PC stage controls

the output current to LED power levels. Through a theoretical analysis, the chosen topolo- gies are determined, and each stage is studied separately, in order to determine the operation

characteristics and specificities. Therefore, chosen the Boost Bridgeless Totel-Pole topology integrated to the resonant LLC converter, it is also proposed the use of variable inductances in both stages in order to obtain an increase in the circuit’s degrees of freedom. Furthermore, the topology aim is to obtain ZVS feature, the design of the converters is developed, as well as analyzes in simulation environments, and the implementation of a prototype are carried out to prove the operation of the circuit.