A characterization framework to optimize LED luminaire's luminous efficacy

Barroso, Angel; Dupuis, Pascal; Alonso, Corinne; Jammes, Bruno; Séguier, Lionel; Zissis, Georges

doi:10.1109/ias.2015.7356865

Cited by 10 publications

(10 citation statements)

References 8 publications

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“…Construction solutions of luminaires, available on the market, make it possible to design lighting adjusted to specific requirements and operating conditions such as high ambient temperature [11]. The impact of temperature must be considered at the design stage to ensure high luminous efficacy of LED luminaires [12][13][14][15]. Modern luminaires are adapted to work in advanced lighting control systems frequently cooperating with day lighting systems [16,17].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Luminaire with Variable Luminous Intensity Distribution

et al. 2020

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The field of indoor lighting covers a wide range of lighting uses with varying requirements for lighting conditions to be satisfied by properly selected lighting equipment. The need to frequently change the arrangement of useable areas entails the necessity to adapt the lighting to new requirements. A good solution for reducing costs and saving time is a luminaire adjusting the luminous flux and spatial luminous intensity distribution in a wide range. The authors present the concept of an adaptive luminaire and its construction assumptions. In addition, the results of studies on the development of the concept are shown together with conditions and limitations that influenced the construction of the luminaire. The analysis of the surface of the moveable reflector is presented, and the results of testing the luminaire prototype are compared with the results of simulation tests.

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Section: Introductionmentioning

confidence: 99%

Adaptive Luminaire with Variable Luminous Intensity Distribution

et al. 2020

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“…In order to meet given criteria, semi-conductor light sources are joined in groups, comprising the so-called panels or LED matrices. Such panels include in their structure several or a dozen or so semi-conductor light sources, due to which it is possible to acquire the required value of the light-source Φ [3][4][5]. The article studies were conducted for the panel in its structure containing 12 high power LEDs.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of the Factors Influencing Junction Temperature of LED Panel Sources

et al. 2019

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Limiting junction temperature T j and maintaining its low value is crucial for the lifetime and reliability of semi-conductive light sources. Obtaining the lowest possible temperature of T j is especially important in the case of LED panels, where in a short distance there are many light sources installed, between which there occurs mutual thermal coupling. The article presents results of simulation studies connected with the influence of construction and ambient factors that influence the value of junction temperature of exemplary LED panel sources. The influence of radiator's construction, printed circuit boards, as well as the influence of ambient factors, such as ambient temperature T a and air flow velocity v were subjected to the analysis. Numerical calculations were done in the FloEFD software of the Mentor Graphics company, which is based on computational fluid dynamics (CFD). For construction of the LED thermal panel model the optical efficiency η o and real thermal resistance Rth j-c were determined in a laboratory for the applied light sources.

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“…This is due to its longer lifetime as it is roughly quoted as 25,000 to 50,000 h [4][5][6]. Besides, their higher efficacy compared to other sources of lighting reaches 250 lm/W [7,8]. More features such as smaller size, faster response, robustness, reliability, and colour rendering index are also shown by the LEDs [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis, design, and experimentation of the active hybrid‐series‐parallel PWM dimming scheme for high‐efficient off‐line LED drivers

Abdelmessih

Alonso

Costa

2019

IET Power Electronics

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This study presents a high power factor (PF) light-emitting diode (LED) driver featuring a pulse width modulation (PWM) dimming technique. The integrated buck-flyback-buck converter (IBFBC) is built by connecting a buck converter to the integrated buck-flyback converter's output. The IBFBC ensures a constant output current regulation as well as high PF at all dimming ratios. The purpose of the output buck converter is to clear up the discontinuous power operation created by the PWM dimming. This occurs when the buck converter absorbs the output power, at LED switched-off, and sends it back to the input. Thus, the IBFBC maintains the operational enhancement shown by the hybrid-series-parallel (HSP)-PWM technique, ensuring greater efficiency. This study explains the operating principles of the IBFBC using circuit diagrams as well as an average model for the entire converter. Moreover, the study presents a mathematical analysis of the IBFBC power flow. It provides guidance on how to select the optimum value for the output buck inductance. A 230 V, 50 Hz input, 160 V output, 100 W AC-DC converter operating at 100 kHz has been implemented. The prototype is fully tested to demonstrate the active HSP-PWM technique. An efficiency ranging 50-86% corresponding to the dimming ratio of 5-100% is reached, where 5% dimming refers to an output power of 4 W.

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A characterization framework to optimize LED luminaire's luminous efficacy

Cited by 10 publications

References 8 publications

Adaptive Luminaire with Variable Luminous Intensity Distribution

Adaptive Luminaire with Variable Luminous Intensity Distribution

Thermal Analysis of the Factors Influencing Junction Temperature of LED Panel Sources

Analysis, design, and experimentation of the active hybrid‐series‐parallel PWM dimming scheme for high‐efficient off‐line LED drivers

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