Palavras Chaves: Diodos Emissores de Luz
Resumo
Este trabalho apresenta a concepção e o desenvolvimento de um sistema de iluminação baseado em diodos emissores de luz (LEDs) capaz de reproduzir espectros da luz com precisão para aplicações que exigem um espectro da luz específico. A metodologia proposta utiliza Programação Matemática, através de um modelo de Programação Linear Inteira Mista, para obter a combinação ótima de modelos de LEDs que resultam no espectro mais próximo possível da referência. Os LEDs de cada modelo selecionado pelo procedimento de otimização são acionados por um sistema eletrônico composto por conversores Buck com controle de corrente por histerese e controle de intensidade luminosa por Modulação por Largura de Pulso. O controle independente de cada modelo de LED permite a possibilidade de variar a intensidade e a distribuição espectral da luz, agregando flexibilidade ao sistema de iluminação. Como aplicação prática, um sistema é desenvolvido para reproduzir o espectro da luz solar para diferentes horários do dia. Os testes para validação da metodologia proposta demonstraram que é possível reproduzir determinados espectros com fidelidade, com um erro relativo médio de 12% entre o espectro projetado e o espectro referência, considerando os modelos de LED disponíveis.
Title: DESIGN METHODOLOGY AND DEVELOPMENT OF A FLEXIBLE LIGHT SIMULATOR BASED ON LIGHT-EMITTING DIODES
Keywords: Light-Emitting Diodes, solid state lighting
Abstract
This work presents the design and development of a lighting system based on light emitting diodes (LEDs) capable of accurately reproducing light spectra for applications that require a specific light spectrum. The proposed methodology uses Mathematical Programming, using a Mixed Integer Linear Programming model, to obtain the optimal combination of LED models that result in the spectrum as close as possible to the reference. The LEDs of each model selected by the optimization procedure are driven by an electronic system composed of Buck converters with current control by hysteresis and control of light intensity by Pulse Width Modulation. The independent control of each LED model allows the possibility to vary the intensity and the spectral distribution of the light, adding flexibility to the lighting system. As a practical application, a system is developed to reproduce the spectrum of sunlight for different times of the day. Tests to validate the proposed methodology demonstrated that it is possible to reproduce certain spectra with fidelity, with an average relative error of 12% between the designed spectrum and the reference spectrum, considering the LED models available.
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