Emergency lighting system integrated into a compact 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, small size and they are resistant to vibrations. Besides, they are supplied 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 simply replacing incandescent and compact fluorescent lamps with a LED lamp. The proposed circuit supplies the LEDs in two ways. First, by mains (220VAC) using a circuit called voltage regulator in DC. Another way, in the emergency mode, the circuit supplies the LED using a Ni-MH battery without the need of converter. The Brazilian standard (NBR 10898) and IEEE standard (IEEE Std 446–1995) for emergency lighting systems are attended by the topology. The complete circuit was simulated and the results show a satisfactory behavior of the lamp.