Emergency lamp using high-brightness LED

This paper presents an emergency lighting system integrated into a compact lamp using high-brightness LEDs. These devices present high luminous efficacy, long useful life and small size. Besides, they operate with low voltage and current levels and they do not require ignition process. These features make these devices attractive to use in emergency lighting. The proposed circuit is simple and has few components. 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 one, 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 proposed topology is in accordance to the Brazilian (NBR 10898) and IEEE (IEEE Std 446-1995) standards for emergency lighting systems. The proposed circuit was implemented and the experimental results show a satisfactory behavior of the lamp.