Latest Developments in LED Drivers

Abstract

Although the phenomenon of electroluminescence was discovered by H [...]

Study on the Power Quality of LED Street Luminaires

“…Different studies [13,16] conclude that one other power quality problem can be the odd harmonic currents generated by the LED street luminaires if they are connected in high numbers. From the odd harmonic currents, the third-order-type harmonic current effects on the neutral wire are neutralized by using the TN-C single line supply diagram and TN-C-S from the pole interior connection box, as is the case for all of the three street lighting systems.…”

“…Sometimes the two-stage solution for ac-dc LED drivers is unable to ensure proper control of the forward current of each LED in complex LED arrangements. In this case, the two-stage solution becomes the three-stage solution for ac-dc LED drivers employing a post-regulator per string [12,13]. Measurements performed on LED lamps with a nominal power of less than 25 W show that the lamps operating with LED technology introduce strong distortions of the electrical current and generate reactive capacitive power, representing possible power quality problems if used in high numbers [14].…”

8 MHz High Efficient Resonant SEPIC Converter Design for LED Driver of Endoscopy Systems

“…For safe operation of LEDs, drivers controlling the current and the voltage of LEDs are required. It is also important that LED drivers should be designed to not limit the performance of the LED [8]. Therefore, design stage of the selected driver topology is important task to provide the best performance of the LED.…”

Design and Modeling of a 100W 1MHz GaN-Based Single-Switch Resonant Converter for High Power Density Inherent PFC LED Driver

“…In a today context of green energy usage, Light Emitting Diodes (LEDs) are gradually replacing incandescent light bulbs and fluorescent lamps in most of the applications. This is mainly due to their higher efficiency, robustness and their control capabilities [1]. However, the forward voltage of LEDs can vary according to several parameters such as temperature, ageing… Therefore, the most efficient solution for lighting is to use a power converter, called LED driver, that is able to regulate the current through the LEDs.…”