Improved design methodology for LED lamps

Chies, Leandro; Costa, Marco A. Dalla; Bender, Vitor C.

doi:10.1109/isie.2015.7281642

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Many research teams have realized the importance of characterizing LEDs in multiple domains of operation. Mostly, these studies used empirical and sometimes rough approximations to obtain model parameters from measured data, see, e.g., [13][14][15][16][17]. In [13], an emphasis was placed on modelling LEDs' efficiency.…”

Section: The Wider Backgroundmentioning

confidence: 99%

“…In [13], an emphasis was placed on modelling LEDs' efficiency. The authors of [14] with their ambitious target design of retrofitted LED lamps, used the photo-electro-thermal theory, which in our view is a relatively rough, empirical way of describing LED behavior. The authors of [15][16][17] in their work relied on LED characterization tools that have been introduced to the SSL industry as a result of our team's pioneering work in multi-domain characterization [18,19].…”

Section: The Wider Backgroundmentioning

confidence: 99%

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Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

et al. 2019

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This paper presents our approaches to chip level multi-domain LED (light emitting diode) modelling, targeting luminaire design in the Industry 4.0 era, to support virtual prototyping of LED luminaires through luminaire level multi-domain simulations. The primary goal of such virtual prototypes is to predict the light output characteristics of LED luminaires under different operating conditions. The key component in such digital twins of a luminaire is an appropriate multi-domain model for packaged LED devices that captures the electrical, thermal, and light output characteristics and their mutual dependence simultaneously and consistently. We developed two such models with this goal in mind that are presented in detail in this paper. The first model is a semi analytical, quasi black-box model that can be implemented on the basis of the built-in diode models of spice-like circuit simulators and a few added controlled sources. Our second presented model is derived from the physics of the operation of today’s power LEDs realized with multiple quantum well heterojunction structures. Both models have been implemented in the form of visual basic macros as well as circuit models suitable for usual spice circuit simulators. The primary test bench for the two circuit models was an LTspice simulation environment. Then, to support the design of different demonstrator luminaires of the Delphi4LED project, a spreadsheet application was developed, which ensured seamless integration of the two models with additional models representing the LED chips’ thermal environment in a luminaire. The usability of our proposed models is demonstrated by real design case studies during which simulated light output characteristics (such as hot lumens) were confirmed by luminaire level physical tests.

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Section: The Wider Backgroundmentioning

confidence: 99%

Section: The Wider Backgroundmentioning

confidence: 99%

Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

et al. 2019

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“…The LED datasheet presents some wavelength corresponding values of the SPD in graphic form, and then the radiant SPD can be approximated by fitting three Gaussian functions, according to (13) where ai is the amplitude, bi is the centroid (location), ci is related to the peak width of a Gaussian function. Section II.D describes these coefficients´ values.…”

Section: B Kh Coefficient Estimativementioning

confidence: 99%

“…Nevertheless, a difficult factor to use PET theory is that most of these theories require experimental tests in expensive equipments to obtain the PET theory parameters, for example an integrating sphere. References [13] and [14] presented a strategy to obtain the PET theory parameters trough the LED datasheet information.…”

Section: Introductionmentioning

confidence: 99%

Design Methodology for LED Lighting Systems Based on Photo-Electro-Thermal Interrelationships

Chies¹,

Melo²,

Vizzotto³

et al. 2018

Eletrônica de Potência

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-This paper presents a design methodology for LED (Light-Emitting Diode) lighting systems based on photo-electro-thermal (PET) interrelationships. The proposed methodology uses only LED datasheet information, which makes experimental tests unnecessary to obtain the design parameters. The methodology allows identifying several design specifications, such as, luminous efficacy, heatsink thermal resistance, LED junction temperature and forward current, essential aspects to produce a satisfactory lighting system. Thus, it is possible to define the lighting system features based on standards requirements to obtain the desired system results. Initially, a review of several PET theories is presented, and a new mathematical analysis is performed, in order to highlight the main contributions of the methodology. An LED bulb lamp design is presented to exemplify the methodology. Finally, experimental tests with the proposed LED lamp resulted in a luminous flux of 1271 lm, with a luminous efficacy of 112 lm/W, and LED junction temperature of 79.67 ºC. The errors between calculated and measured luminous flux, luminous efficacy and LED junction temperature were 3.70%, 1.88%, and 3.85%, respectively. These results validate the proposed methodology.

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Experimental evaluation and classification of LED lamps for typical residential applications

Collin

Djokić

et al. 2017

2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)

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Improved design methodology for LED lamps

Cited by 3 publications

References 8 publications

Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

Design Methodology for LED Lighting Systems Based on Photo-Electro-Thermal Interrelationships

Experimental evaluation and classification of LED lamps for typical residential applications

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