Dissertação
Aprimoramento da estimativa do fluxo luminoso e metodologia de projeto para sistemas de iluminação que utilizam diodos emissores de luz
Fecha
2016-03-31Registro en:
CHIES, Leandro. Improved luminous flux estimation and design methodology for leds systems. 2016. 127 f. Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2016.
Autor
Chies, Leandro
Institución
Resumen
The understanding of the interrelationships among the photometrical, electrical and
thermal (photo-electro-thermal) parameters is extremely important to design lighting systems
based on light-emitting diodes (LEDs), because the LEDs are highly influenced by these
conditions. The efficacy and lifespan of an LED system that uses even the best LEDs,
commercially available, will be only a fraction of what it would be if the electrical, thermal
and optical design is poorly designed. This work proposes an improvement in the estimative
of the luminous flux using photo-electro-thermal parameters, without needing any laboratory
test. When designing an LED lighting system, it is possible to get almost identical results in
terms of luminous flux, luminous efficacy and lifetime by scaling the parameters: intensity of
the LED current, the amount of LEDs and the system design cooling. Therefore, a design
methodology for LED lighting systems is also proposed. This methodology provides the
creation of a design space where the designer can directly identify: the value of the luminous
efficacy, thermal resistance of the heatsink and junction temperature when varying the
number of LEDs and the direct current, without performing any laboratory testing or using
some simulation software with high computational cost. Thus, the designer can set the initial
design faster and relate it to the costs involved. Experimental tests were performed in order to
validate the proposed design methodology.