Review of high efficiency integrated LED lighting

Abstract

Light emitting diodes (LEDs) are solid-state devices that are highly energy efficient and considerably more durable compared with other forms of lighting, such as compact fluorescent lights (CFL) and traditional incandescents. LED technology has improved steadily over the years: every decade, the cost per lumen falls by a factor of 10 and the amount of light generated per LED package increases by a factor of 20 for a given wavelength of light. This has resulted in significant growth in the LED industry. Moreover, LED lighting can help contribute to the broader vision of having smart interconnected cities by unlocking the full potential of next-generation digital lighting and enabling a cleaner, greener and even brighter future. To enable this, methods that could improve the energy efficiency of current integrated LED lighting needs to be explored such that the cost of future integrated LED lighting can be reduced. A review on potential methods that could be utilised to design a highly integrated LED light bulb will therefore be presented in this paper. These include the comparison between the performances of wide-bandgap based field effect transistors (FETs) with silicon-based FETs, quasiresonant circuit topologies that could be utilised to lower power switching losses as well as integration of on-chip magnetics.