Journal ArticleDOI
An Efficient Driver for Dimmable LED Lighting
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TLDR
A high efficiency driver circuit is proposed for Light Emitting Diode (LED) lamps with dimming feature that includes a fly-back converter in series with the dc-link.Abstract:
An efficient driver circuit is proposed for light-emitting-diode (LED) lamps with a dimming feature. The driver consists of a flyback converter in series with the dc-link. By processing partial power of the driver circuit for current regulation, the loss produced by power conversion can be diminished. The dimming feature is accomplished by means of current amplitude modulation (AM) or double pulse-width modulation (DPWM). The detailed circuit operation stages and analysis are provided. A laboratory circuit is designed for a 45 W LED lamp. Experimental results demonstrate that a high efficiency can be achieved, even at dimmed lamp power.read more
Citations
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Journal ArticleDOI
A Novel Primary-Side Regulation Scheme for Single-Stage High-Power-Factor AC–DC LED Driving Circuit
Yan-Cun Li,Chern-Lin Chen +1 more
TL;DR: This paper integrates a novel primary-side regulation (PSR) scheme with a single-stage high-power-factor (PF) ac-dc light-emitting-diode (LED) driving circuit based on the combination of a buck-boost PF corrector and a flyback converter.
Journal ArticleDOI
Matching LED and Driver Life Spans: A Review of Different Techniques
Pedro S. Almeida,Douglas Camponogara,Marco A. Dalla Costa,Henrique A. C. Braga,J. Marcos Alonso +4 more
TL;DR: A review of various proposed schemes to increase the reliability and life span of solid-state lighting (SSL) systems is presented in this article, where several power-?conversion configurations aimed to capacitance reduction and capacitor technology exchange are put forward as alternative solutions for implementing long-life drivers, with remarks on both their benefits and drawbacks.
Journal ArticleDOI
Design and Implementation of a Single-Stage Driver for Supplying an LED Street-Lighting Module With Power Factor Corrections
TL;DR: In this paper, a single-stage light-emitting diode (LED) driver for street lighting applications with power factor corrections (PFC) was proposed, which integrates a modified bridgeless PFC ac-dc converter with a half-bridge-type LLC dc-dc resonant converter into a single stage conversion circuit topology.
Journal ArticleDOI
Analysis of the Integrated SEPIC-Flyback Converter as a Single-Stage Single-Switch Power-Factor-Correction LED Driver
Behzad Poorali,Ehsan Adib +1 more
TL;DR: A new isolated single-stage single-switch power-factor-correction (S4 PFC) driver for supplying light-emitting diodes (LEDs) without electrolytic capacitor is proposed.
Journal ArticleDOI
A Novel Single-Stage High-Power-Factor LED Street-Lighting Driver With Coupled Inductors
TL;DR: In this paper, a single-stage high-power-factor (HPF) LED driver with coupled inductors for street lighting applications is proposed, which integrates a dual buck-boost power-factor-correction (PFC) ac-dc converter and a half-bridge-type LLC dc-dc resonant converter into a single stage-conversion circuit topology.
References
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Journal ArticleDOI
A High-Efficiency Dimmable LED Driver for Low-Power Lighting Applications
TL;DR: A dimmable light-emitting diode (LED) driver with adaptive feedback control for low-power lighting applications and an improved pulsewidth modulation dimming technique is studied for regulating the LED current and brightness.
Proceedings ArticleDOI
Power driver topologies and control schemes for LEDs
TL;DR: In this article, different DC-DC converter topologies are discussed which can be adapted to feed a constant current into a LED load, and the features of different pulsating current waves are investigated concerning their peak, RMS and high frequency content.
Journal ArticleDOI
A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC–DC Drivers
TL;DR: In this paper, a flyback-based electrolytic capacitor-less light-emitting diode (LED) driver is proposed, which converts the commercial ac voltage to a pulsating current with twice the line frequency driving high-brightness LEDs.
Journal ArticleDOI
LED Driver With Self-Adaptive Drive Voltage
Yuequan Hu,Milan M. Jovanovic +1 more
TL;DR: In this article, the output voltage of the preregulator is always self-adjusted so that the voltage across the linear current regulator of the LED string with the highest voltage drop is kept at the minimum value that is required to maintain the desired string current.
Proceedings ArticleDOI
A Universal-Input Single-Stage High-Power-Factor Power Supply for HB-LEDs Based on Integrated Buck-Flyback Converter
TL;DR: In this paper, a streetlight LED application is covered, using the Integrated Buck-Flyback Converter developed in previous works, which performs power factor correction from a universal ac source, as well as a control loop using the LM3524 IC, which allows PWM dimming operation mode.