Feasibility study of extra-low voltage DC implementation for LED lighting systems in building
Ardiyanto, Nurul Husna
Date of Issue2016-05-24
School of Electrical and Electronic Engineering
Total energy consumption in Singapore’s household system is as huge as 6,560 GWh Among this total energy consumption, the lighting system contributes to 20.9%. The common application of available LED system has a remarkable impact by reducing energy consumption. However, the DC/DC driver in the LED system contributes to system losses and has shorter lifetime than LED’s. Therefore, in this study we proposed novel power distribution for LED lighting system. Compared to commonly available LED lighting system, our novel LED lighting system eliminated the DC/DC driver part. The systematic assessment of LED Lighting System driven by Extra Low Voltage Direct Current (ELVDC) topologies was conducted. Then, electrical characteristics of qualified LED lamps that meet Singapore regulations were applied to the calculation for ELVDC. In order to understand ELVDC feasibility in comparison with AC system for lighting application, we assessed the voltage drop across the cable, system power loss, total efficiency, safety and the potential economic savings. We found that LED lamp could replace CFL by producing 138 to 191 lux within tolerable voltage level with clear diffuser type. Furthermore, the feasible ELVDC topologies for LED Lighting system could achieve up to 92.22% efficiency in unipolar topology and 92.65% efficiency in bipolar topology. More importantly, it provided savings with respect to AC system up to 70.7%. Based on these results, we concluded that it is feasible to use driverless ELVDC topology for LED lighting system. Our results mainly impact on smart building development and may contribute to decrease global energy consumption.