Abstract
LEDs are highly energy efficient and have substantially longer lifetimes compared to other existing lighting technologies. In order to facilitate the new generation of LED devices, approaches to improve power efficiency with increased integration level for lighting device should be analysed. This paper proposes a fully on-chip integrated LED driver design implemented using heterogeneous integration of gallium nitride (GaN) devices atop BCD circuits. The performance of the proposed design is then compared with the conventional fully on-board integration of power devices with the LED driver integrated circuit (IC). The experimental results confirm that the fully on-chip integrated LED driver achieves a consistently higher power efficiency value compared with the fully on-board design within the input voltage range of 4.5–5.5 V. The maximal percentage improvement in the efficiency of the on-chip solution compared with the on-board solution is 18%.
Highlights
Light-emitting diodes (LEDs) have a high energy efficiency, a long lifetime and environmentally friendly properties compared to other lighting technologies [1,2]
In addition to their significant advantages in the illumination aspect, LEDs could play an active role in enabling smart city applications, such as the development of visible light communications (VLC), a data communications variant using visible light between 400 and 800 THz
The printed circuit board (PCB) evaluation board has a compact size of 50.9 × 51 mm2
Summary
Light-emitting diodes (LEDs) have a high energy efficiency, a long lifetime and environmentally friendly properties compared to other lighting technologies [1,2]. LEDs are extensively used these days in various applications, exemplified in personal cell phones to large commercial advertising display boards In addition to their significant advantages in the illumination aspect, LEDs could play an active role in enabling smart city applications, such as the development of visible light communications (VLC), a data communications variant using visible light between 400 and 800 THz (780–375 nm) intended to complement radio frequency (RF) transmissions [3]. In order to enable the full potential of next-generation smart lighting, there are several crucial parameters that need to be considered and optimised in LED driver design. These parameters include efficiency, size, and the cost of LED driver designs. Much research in LED driver design has attempted to improve power efficiency with various driver topology and control schemes
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