Compact emergency lighting system using high-brightness LED lamp

Abstract

This paper presents an emergency lighting system integrated into a compact lamp using high-brightness LEDs. These devices have high luminous efficacy, long useful life and small size. Besides, they work with low voltage and current values and they do not need ignition process. These features make these devices attractive to use in emergency lighting. The proposed circuit is simple and has low cost. Its main characteristic is the easiness of installation with the simple replacement of incandescent and compact fluorescent lamps by the LED lamp. The proposed circuit supplies the LEDs in two ways. In the first way, the lamp is supplied by mains (220V AC ) using a circuit called voltage regulator in DC. In the second situation, in the emergency mode, the circuit supplies the LED by a Ni-MH battery without the need of converters. The Brazilian standard (NBR 10898) and IEEE standard (IEEE Std 446–1995) for emergency lighting systems are attended by the proposed topology. The proposed circuit was implemented and the experimental results show a satisfactory behavior of the lamp.