Compact emergency lamp using power LEDs

This paper presents a compact emergency lamp using light emitting diodes (LEDs). The goal is to develop a compact and low cost electronic circuit to drive and control the current of LEDs arranged in a single enclosure. The proposed idea allows using the same equipment in the daily activities, supplied by mains, and under a possible failure of it. The proposal aims energy saving, high luminous efficacy and high useful life when replacing traditional emergency lighting systems, using fluorescent lamps by LEDs. The use of E-27 socket (the same used in traditional incandescent lamps), provides the advantage of easy installation, with the simple replacement of the lamp without any change in the electrical installation. To supply the LEDs by mains and by battery a Buck and a Boost converter were employed. The converters work without electrolytic capacitors which has advantages such as reducing of size and cost of the circuit and increasing the driver´s useful life. The battery can be composed of three rechargeable Ni-MH batteries (1.2 V) or a Li-Ion battery (3.6 V). The design complies with the Brazilian standard and international standard for emergency lighting systems. The complete circuit was implemented and the experimental results show a satisfactory behavior of the lamp.