Sistema eletrônico isolado com elevado fator de potência e reduzidas capacitâncias para alimentação de leds aplicado à iluminação pública

• Ano de defesa: 2013
• Autor(a) principal: Luz, Paulo Cesar Vargas
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Engenharia Elétrica; UFSM; Programa de Pós-Graduação em Engenharia Elétrica
• Palavras-chave em Português: Conversores eletrônicos com isolação; Correção do fator de potência; Integração de conversores; LEDs para iluminação pública; Electronic converters with isolation; LEDs to street lighting; Power factor correction; Integrated converters; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: http://repositorio.ufsm.br/handle/1/8542

This work aims to develop a family of electronic converters with electrical isolation to supply a group of power light emitting diodes, applied to street lighting systems. The converters have high power factor and still meets the IEC61000-3-2, for lighting equipment. The integration between the power stages is realized to decrease the number of active semiconductors in the topologies. The topologies are modeled, considering the electrical model of light emitting diodes, and controllers are proposed to turns possible the reduction of the capacitances values in the analyzed topologies. This reduction aims to turns possible the replacement of the electrolytic capacitors for film capacitors, with higher lifetime. The implemented topology is a converter with 70 W of power, supplying 32 power LEDs with 700 mA. The experimental results prove the design methodology, presenting the desired characteristics, like high power factor (0.962), agreement with the standard IEC 61000-3-2 and high efficiency (88%).