Abstract
This paper presents an efficient and compact emergency lighting system using high intensity light emitting diodes (LEDs). The proposal aims energy saving, high luminous efficacy and high useful life when replacing traditional emergency lighting systems and incandescent or compact fluorescent lamps by LEDs without any change in electrical system installation. A Buck converter is used to supply the LEDs and charge the battery by mains, with universal input voltage (90 VAC - 240 VAC), and a Boost converter is used to supply the LEDs by battery. The converters operate at high frequency and control the LEDs current independently. A Li-Ion battery was chosen because it has higher voltage and density of energy than Ni-MH one. The design attends the Brazilian standard (NBR 10898) and IEEE standard (IEEE Std 446-1995) for emergency lighting systems. The complete circuit was implemented and the experimental results show a satisfactory behavior of the lamp.
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