92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

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%.

A 35 V–5 V monolithic integrated GaN-based DC–DC floating buck converter

“…In addition, some previous reports have attempted to combine them on the printed circuit board (PCB) to improve performance. Specifically, Soh et al [9] introduces a fully on-chip integrated light-emitting diodes (LEDs) driver application based on a floating buck converter. The gate driver chip, GaN power field effect transistors (FETs) die and LED die are heterogeneously integrated by bonding connection in one package.…”

Dimming Techniques Focusing on the Improvement in Luminous Efficiency for High-Brightness LEDs

“…Different dimming techniques or functions employed will bring diverse concerns to their impact on a visible light flickering to a human eye and the power quality of a grid [20][21][22]. Therefore, a large number of new driver topologies have been proposed to raise the driver efficiency and power density [23][24][25][26][27]. On the other hand, many literatures focus on the research of novel dimming and current control methods that can achieve more luminosity flux generation with the least energy consumption to further meliorate the entire driving performance.…”