Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output Current

Chen, Wu; Hui, S.Y.R.

doi:10.1109/tpel.2010.2103959

Cited by 218 publications

(89 citation statements)

References 21 publications

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“…In general lighting applications a compact ac/dc (alternating current/direct current) converter [6][7][8] should be used to supply dc current to LEDs, which introduce nonlinearity to the system. As nonlinear loads, LEDs might produce highly-distorted currents.…”

Section: Introductionmentioning

confidence: 99%

On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads

Milardovich

Prevosto

Lara

et al. 2017

AEM

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An experimental investigation of diversity factors of CFL (compact fluorescent lamps) in combination with LED (light emitting diode) lamps is presented in this paper. Attention was paid to the reduction of low–order harmonic currents, especially the third one; which is mainly responsible for the strong increase in power losses in the neutral conductor of low–voltage installations. The harmonic currents drawn by several LED and CFL lamps with nominal powers < 25 W were first measured to investigate the electrical characteristics of individual lamps. In addition, a series of experiments was conducted in which LED lamps were powered between lines through small autotransformers thus avoiding the use of the neutral conductor. The results showed in both cases a sensible reduction of the harmonic current of third order and therefore a marked reduction of the power losses associated with them.

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Section: Introductionmentioning

confidence: 99%

On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads

Milardovich

Prevosto

Lara

et al. 2017

AEM

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show abstract

“…In [7], flyback converter with a bidirectional buck-boost converter at the flyback's output was used to absorb the pulsating component of the LED current to eliminate low frequency component of the LED current and the output energy storage capacitor used in the conventional flyback converter. In [8], a modified flyback converter with an additional auxiliary winding and three switches was presented to provide constant current to the output. In [9], a coupled inductor PFC singleswitch 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.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Compact LED Driver For Long Life with PWM Dimming Functionality

Sreeram¹

2017

IJRASET

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Solid state lighting like Light Emitting Diode (LED) lamps are eco-friendly, mercury-free, more energy efficient, able to ignite instantly and have longer lifetime, superior efficacy performance. Commercial / residential LED lamps should achieve high power factor greater than 0.9 according to Energy Star Criteria for Solid State Lighting Luminaries and harmonics of the input current should meet the IEC 61000-3-2 Class C standard. Large output capacitance is required at the output of the LED driver circuit to balance the energy difference between the input pulsating AC power and output DC power delivered to the LED load and minimize the low frequency LED output current ripple. There is a mismatch between the lifetime of electrolytic capacitors (5000 hours) and the LED (1,00,000 hours) that affects lifetime of overall LED system. A compact single-switch AC/DC high power factor electrolytic capacitor-less LED driver with integrated PFC circuit and step-down voltage conversion circuit is proposed here. Simulation and hardware models were developed on a 12-W LED lamp. A remote controlling technique is used to provide different dimming level function for even the non-dimmable LED lamps. The LED driver system also operates with high power factor of 0.95 in accordance with Energy Star Criteria for Solid State Lighting Luminaries and low Total Harmonic Distortion of 21% which is within the limits of IEC 61000-3-2 Class C standards.

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“…The two-stage ac-dc converter consists of two power-process stages with their respective control circuits, which are the PFC circuit and the high frequency dc-dc converter [9,10]. Therefore the two-stage ac-dc converter increases the power losses and the manufacturing cost, and eventually its system efficiency and price competitiveness are reduced.…”

Section: Introductionmentioning

confidence: 99%

Improved Single-Stage AC-DC LED-Drive Flyback Converter using the Transformer-Coupled Lossless Snubber

Jeong¹,

Kwon²

2016

Journal of Electrical Engineering and Technology

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-This paper presents an improved single-stage ac-dc LED-drive flyback converter using the transformer-coupled lossless (TCL) snubber. The proposed converter is derived from the integration of a full-bridge diode rectifier and a conventional flyback converter with a simple TCL snubber. The TCL snubber circuit is composed of only two diodes, a capacitor, and a transformer-coupled auxiliary winding. The TCL snubber limits the surge voltage of the switch and regenerates the energy stored in the leakage inductance of the transformer. Also, the switch of the proposed converter is turned on at a minimum voltage using a formed resonant circuit. Thus, the proposed converter achieves high efficiency. The proposed converter utilizes only one general power factor correction (PFC) control IC as its controller and performs both PFC and output power regulation, simultaneously. Therefore, the proposed converter provides a simple structure and an economic implementation and achieves a high power factor without the need for any separate PFC circuit. In this paper, the operational principle of the proposed converter is explained in detail and the design guideline of the proposed converter is briefly shown. Experimental results for a 40-W prototype are shown to validate the performance of the proposed converter.

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Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output Current

Cited by 218 publications

References 21 publications

On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads

On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads

Design and Development of Compact LED Driver For Long Life with PWM Dimming Functionality

Improved Single-Stage AC-DC LED-Drive Flyback Converter using the Transformer-Coupled Lossless Snubber

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