Sistemas eletrônicos para iluminação de exteriores empregando diodos emissores de luz (LEDs) alimentados pela rede elétrica e por baterias

• Main Author: Pinto, Rafael Adaime
• Publication Date: 2012
• Format: Doctoral thesis
• Language: por
• Source: Manancial - Repositório Digital da UFSM
• dARK ID: ark:/26339/001300000cs3h
• Download full: http://repositorio.ufsm.br/handle/1/3675
• topic: Diodo emissor de luz; LED; Integração de conversores; Iluminação de emergência; Iluminação pública; Conversores alimentados por baterias; Conversores bidirecionais; Horário de ponta; Circuitos eletrônicos para iluminação; LED; Integrated converters; Emergency lighting; Street lighting; Converters supplied by batteries; Bidirectional converters; Peak load time; Electronic circuits for lighting; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA

This work presents a design methodology and analysis of electronic circuits applied to outdoor lighting systems using light emitting diodes (LEDs). The goal of topologies developed here is to supply the LEDs from the mains, with high power factor, and from batteries when it is needed. Thus, some topologies employing integrated DC-DC converters and single stage converters are proposed and analyzed. The main application of these topologies is street lighting systems without energy consumption from the mains during the Peak Load Time, feeding the circuit by batteries. Moreover, the batteries can keep the system working during a possible fault in the main power supply, operating as an emergency lighting system. These applications are justified by the reduction in energy demand from the electric power system and by the increase in the lighting system reliability. Throughout the work, the main characteristics of the LED and batteries applied in lighting systems are presented, as well as the specification of the luminaire and the battery bank employed. The design methodology proposed for each topology aims to help the converter design intended for better utilization of semiconductors and reduce the value of the bus capacitor. A critical analysis of the converters is performed in order to evaluate the efficiency of the circuits, the power factor, the voltage and current characteristics of the main devices, and compliance with the IEC 61000-3-2 Class C standard that limits the harmonic content of the input current. Finally, electronic circuits are proposed for the management and control of the lighting system.