Isolated AC/DC Offline High Power Factor Single-Switch LED Drivers Without Electrolytic Capacitors

Lam, John; Jain, Praveen

doi:10.1109/jestpe.2015.2419637

Cited by 43 publications

(18 citation statements)

References 24 publications

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“…Yes. [89], [91], [98], [103], [129] -Analog: [64], [85], [88], [89], [92]- [94], [96], [102]- [105], [119], [121]- [130], [132], [133] -Digital: [91], [95], [97], [131] Yes. [88], [92], [98], [99], [101]- [105], [121], [123]- [125], [127]- [132] No electrolytic: [88], [99], [101], [121], [124], [131], [132] 0885-8993 (c) 2018 IEEE.…”

Section: -99 <10mentioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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Light-Emitting Diodes (LEDs) are coming strongly into the lighting market due to their advantages over conventional lighting solutions: energy efficient, controllable in both light and color, long lifetime, lack of a warm-up period and high power density. Some of these advantages will make LED light sources to be more than just a lightbulb, being able to transmit data, control light color, hue and intensity or even detect people in indoor environments. Nevertheless, these advantages attributed to LED capabilities are, in reality, achieved thanks to the LED driver. The present work reviews the current stateof-the-art strategies to drive LEDs from ac power grids with special emphasis into removing the most limiting component from the point of view of the lifetime, which is the electrolytic capacitor, while achieving a flicker-free performance of the light output of the LED driver. Moreover, it focuses on analyzing the required regulations, challenges and applicability of LED drivers in both single-phase and three-phase ac power grids.Note: This only applies for certified dimmable luminaires. Audible noiseLuminaire shall not emit noise above 24 dBA at 1 meter or less at the minimum output.0885-8993 (c)

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Section: -99 <10mentioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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show abstract

“…In [9], a coupled inductor PFC single-switch LED driver circuit is proposed but the switch suffers very high current and voltage stress as the switch needs to handle both PFC inductor current and LED current resulting in low efficiency. In [10], an isolated single-switch AC/DC electrolytic capacitor-less LED driver was proposed but the three winding transformer increases the cost and size. In [11], a electrolytic capacitorless LED driver based on two flyback converters was proposed but it doesn't have the dimming feature for current control.…”

Section: Problem Identification and Solutionmentioning

confidence: 99%

A Single Switch Low Cost LED Driver with Wireless Dimming Controls

Sreeram¹,

Unnikrishnan²,

C³

2017

IJERT

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In order to nullify the source and light output power and to minimize the low frequency LED current ripple, electrolytic capacitors are generally used for energy efficient residential, industrial and commercial lighting. The life of an electrolytic capacitor is at least 13 times less than that of an LED bulb which affects the life of the LED lamp. To increase the age of the LED lighting fixture, an offline LED driver that does away with electrolytic capacitors or intricate input current control techniques to reduce the low-frequency (i.e., 100 or 120 Hz) output ripple is presented here. The single switch circuit reduces the energy storage capacitance to a few microfarads range, so that reliable film capacitor can be used instead of unreliable electrolytic capacitor. Simulation and hardware results are given on a 8-W LED lamp to validate the novelty of the circuit. The remote controlling mechanism enables to automatically turn ON ,OFF and dim even the non dimmable LED lighting system. Moreover, the system is suitable for any industrial. commercial and industrial lighting applications. The LED driver system also operates with high power factor of 0.99 in accordance with Energy star criteria for Solid State Lighting Luminaries and low Total Harmonic Distortion of 20% which is within the limits of IEC 61000-3-2 Class C standards. There is no flickering as the switching occurs at high frequency.

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“…Other major issues being lifetime and reliability. 8 Importantly, the light output of LED decreases with an increase in the junction temperature and shortens the LED lifetime. Therefore, it is essential to eliminate the use of electrolytic capacitors for boosting the reliability and lifetime of LED drivers.…”

Section: Introductionmentioning

confidence: 99%

An overview of energy efficient solid state LED driver topologies

Yadlapalli

Narasipuram²,

Anuradha³

2019

Int J Energy Res

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LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.

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Isolated AC/DC Offline High Power Factor Single-Switch LED Drivers Without Electrolytic Capacitors

Cited by 43 publications

References 24 publications

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

A Single Switch Low Cost LED Driver with Wireless Dimming Controls

An overview of energy efficient solid state LED driver topologies

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