Development of a Novel Emergency Lighting System with Improved Boost-Flyback Topology

This paper proposes a novel emergency lighting device (ELD), it can be used as an auxiliary lighting equipment to improve the utilization rate of equipment. Two kinds of topologies are used in ELD to achieve the functions of charging the battery and lighting. The battery charging topology uses a two-switch forward, with three-stage charging control to charge the battery when the AC is normal; the lighting circuit uses an improved boost-flyback converter. The output of the lighting circuit will be connected to the Relay. When the external power is stopped or the signal is turned on, the LED light is illuminated. The ELD first tests the functional stability through the burning machine, and then goes to the actual field for three months to test the overall stability of the circuit. The maximum efficiency of battery charging circuit reaches above 95% at a 75% load condition and the maximum efficiency of LED lighting circuit reaches above 98% at a 75% load condition.