LEDs as energy efficient lighting systems: A detail review

Uddin, Sohel; Shareef, Hussain; Mohamed, Azah; Hannan, M. A.; Mohamed, Khodijah

doi:10.1109/scored.2011.6148785

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…In addition, LEDs are gaining popularity as a green solution. Recently, with the rapid development of LED technology, LEDs are widely used in automotive electronics [1], street lighting [2], and LCD backlighting [3]. Recently, medium-and high-power LEDs have been used to replace traditional high-pressure sodium (HPS) lamps for street lighting applications.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Tung¹,

Tuyen

Huy

et al. 2019

Electronics

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This paper presents the implementation of a two-stage light-emitting diode (LED) driver based on commercial integrated circuits (IC). The presented LED driver circuit topology, which is designed to drive a 150 W LED module, consists of two stages: AC-DC power factor correction (PFC) stage and DC/DC power converter stage. The implementation of the PFC stage uses IC NCP1608, which uses the critical conduction mode to guarantee a unity input power factor with a wide range of input voltages. The DC/DC power converter with soft-switching characteristics for the entire load range uses IC FLS2100XS. Furthermore, the design of an electromagnetic interference (EMI) filter for the LED driver and the dimming control circuit are discussed in detail. The hardware prototype, an LED lighting system, with a rated power of 150 W/32 V from a nominal 220 V/50 Hz AC voltage supply was tested to show the effectiveness of the design. The presented LED driver was tested for street lighting, and the experimental results show that the power factor (PF) was higher than 0.97, the total harmonics distortion (THD) was lower than 7%, and the efficiency was 91.7% at full load. The results prove that the performance of the presented LED driver complies with the standards: IEC61000-3-2 and CIRSP 15:2009. Electronics 2020, 9, 52 2 of 22There are three types of LED driver systems: Single-stage [10,11], two-stage [12][13][14], and integrated LED drivers [15,16]. The single-stage LED driver is an AC/DC converter that provides a constant output current for the LED and a unity power factor. The two-stage system consists of two separate stages, an AC/DC power factor correction (PFC) converter and a DC/DC converter. Recently, some integrated topologies were introduced in order to reduce the size and cost. Single-stage and integrated solutions have some advantages such as low-cost designs and high efficiency due to only one energy conversion. However, the PFC of these topologies causes a high-output voltage ripple due to the absence of electrolytic capacitors. Hence, the low-frequency current ripple makes LEDs flicker. These single-stage and integrated solutions are not suitable LED street lighting systems and are instead used for LED-based replacement lamps where small-size converters are needed. Furthermore, the bridgeless topologies usually generate high electromagnetic interference (EMI) due to large dv/dt and di/dt. The two-stage topology is the most popular topology for LED drivers above 100 W [17]. In the two-stage LED driver, the constant output current regulation is more easily implemented due to the bus voltage. Additionally, an isolated DC-DC stage is needed in the LED driver in order to ensure constant current control.Recently, there have been several commercial analog integrated circuits (ICs) available on the market that are recommended for a high power factor and low cost with a high efficiency. These commercial ICs fulfil the IEC 1000-3-2 Class C, but the total harmonics distortion (THD) is higher than 20% [18]. In reference [19], a reson...

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Section: Introductionmentioning

confidence: 99%

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Tung¹,

Tuyen

Huy

et al. 2019

Electronics

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“…However, [3] describe challenges in the LED lighting system which includes the design of the driver interfacing with the electrical system and the LED luminaire. Furthermore, the efficacy (lumen/watt) of the LED plays an important role in the entire system efficiency; a high efficacy will result in a low power consumed by the LED luminaire in maintaining a similar luminance output.…”

Section: Introductionmentioning

confidence: 99%

An energy efficient 48Vdc bipolar ELVDC LED lighting system in a high-rise building

Chew

Tseng

Nguyen

2015

2015 IEEE 11th International Conference on Power Electronics and Drive Systems

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This paper discusses an energy-efficient LED lighting distribution system in high-rise buildings based on 48Vdc bipolar ELVDC distribution nano-grid fed from a centralized AC/DC converter. The paper first introduces the LED lighting system performances and its associated challenges. It then introduces the preference for ELVDC distribution system in the built environment. The paper then presents the mathematical model of the two different ELVDC distribution systems: the unipolar and the bipolar systems and their associated electrical component models. An approximated analysis was done using a constant power load model on the two distribution systems with voltage drop and power loss as the main indices. Simulations were carried out to determine the voltage level and system efficiencies at each node point. Experimental results of the two ELVDC LED lighting systems are verified and are compared with theoretical results. The 48Vdc bipolar ELVDC distribution system has reduced voltage drop and better system efficiency compared to the 24Vdc unipolar system.

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“…Several other works have concentrated on the light distribution and visual performance of LED lamps (e.g., [9]). A few contributions focused on harmonic emissions of LED lamps [10][11].…”

Section: Introductionmentioning

confidence: 99%

Calculation of harmonic losses and ampacity in low-voltage power cables when used for feeding large LED lighting loads

Milardovich

Prevosto

Lara³

2014

AEM

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A numerical investigation on the harmonic disturbances in low-voltage cables feeding large LED loads is reported. A frequency domain analysis on several commercially-available LEDs was performed to investigate the signature of the harmonic current injected into the power system. Four-core cables and four single-core cable arrangements (three phases and neutral) of small, medium, and large conductor cross sections, with the neutral conductor cross section approximately equal to the half of the phase conductors, were examined. The cables were modelled by using electromagnetic finite-element analysis software. High harmonic power losses (up to 2.5 times the value corresponding to an undistorted current of the same rms value of the first harmonic of the LED current) were found. A generalized ampacity model was employed for re-rating the cables. It was found that the cross section of the neutral conductor plays an important role in the derating of the cable ampacity due to the presence of a high-level of triplen harmonics in the distorted current. The ampacity of the cables should be derated by about 40 %, almost independent of the conductor cross sections. The calculation have shown that an incoming widespread use of LED lamps in lighting could create significant additional harmonic losses in the supplying low-voltage lines, and thus more severely harmonic emission limits should be defined for LED lamps.

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LEDs as energy efficient lighting systems: A detail review

Cited by 30 publications

References 32 publications

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

An energy efficient 48Vdc bipolar ELVDC LED lighting system in a high-rise building

Calculation of harmonic losses and ampacity in low-voltage power cables when used for feeding large LED lighting loads

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