Chromatic, Photometric and Thermal Modeling of LED Systems With Nonidentical LED Devices

Chen, Huan-Ting; Lin, D.; Tan, Siew‐Chong; Hui, S. Y. Ron

doi:10.1109/tpel.2014.2302453

Cited by 29 publications

(18 citation statements)

References 21 publications

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“…Light emitting diode with high power possess a manifest in benefits of greater luminous efficiency, reducted energy use, [2] environment friendly and having capability of more operating lifespan over incandescent along with traditional fluorescent lamps used in numerous lighting applications. Various factors like change in component operating conditions and aging, the LEDs from the same case endowed by a manufacturer could result in inconsistent color temperature [7].…”

Section: Introductionmentioning

confidence: 99%

Android Based LIGHTNET for Brightness and Color Temperature Control

Hanchate¹,

Dhonde²

2017

International Journal of Advanced Research in Computer and Comm

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These days, the LEDs used for residential, commercial and industrial sectors puposes could be configured for lively with specific lighting, which provides more efficient outcome. The basic idea is to drive the bi-color stripe (warm white stripe with cool white stripe of LEDs) for precise PWM dimming in the range of 1-10V. The dimming of LED strings is controlled by using the android phone. The most important thing that needs to be taken in consideration for controlling the light level in an energetic way, preserving the desired light level where needed while controlling light to a minimum value. However, the regulation of light intensity (brightness) and colour correlated temperature is obtained by adjusting the PWM dimming for LEDs. PWM signal enables us to attain minimum intensity levels and more linear control of light intensity compared to continuous current dimming methods. Though, accurate LEDs controlling of colors which possess color point maintenance, light intensity control along with color mixing in due with LED device lifespan and changes in temperature at a junction. Smart with efficient lighting evolves from the traditional lighting control system with feedback from integrated sensors. In order to achieve the goal of accurate color mixing of two LED strings (warm and cool white LEDs), the closed loop non-linear feedback control method is adopted instead of a linear control method.

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Section: Introductionmentioning

confidence: 99%

Android Based LIGHTNET for Brightness and Color Temperature Control

Hanchate¹,

Dhonde²

2017

International Journal of Advanced Research in Computer and Comm

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“…A major challenge facing the lighting industry is the need for color consistency in LED illumination [1]- [6]. Due to aging and changing operating conditions, even LEDs from the same bin supplied by a given manufacturer can deliver inconsistent color temperature over time.…”

Section: Introductionmentioning

confidence: 99%

Precise Dimming and Color Control of LED Systems Based on Color Mixing

Lee

Chen

Tan

et al. 2016

IEEE Trans. Power Electron.

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This paper proposes a closed-loop nonlinear method for precisely controlling the luminosity and correlated color temperature (CCT) of a bi-color adjustable light-emitting diode (LED) lamp. The objective is to achieve a precise and fully-independent dimming and CCT control of the light mixture emitted from a two-string LED lamp comprising warm-white and cool-white color LEDs, regardless of the operating conditions and throughout the long operating lifetime of the LED lamp. This control is formulated using the non-linear empirical LED model of the bi-color LED system. Experimental results show that with the proposed closedloop nonlinear control, both CCT and dimming control of the bi-color lamp is significantly more accurate and robust to ambient temperature variations, ambient light interference, and LED aging than the conventional linear control used in existing products. The maximum error in luminous flux employing the proposed nonlinear control method is 3%, compared with 20% using the closed-loop linear method. The maximum deviation in CCT is only 1.78%, compared with 27.5% with its linear counterpart.1 For future correspondence, please email: sctan@eee.hku.hk.

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“…The variation of peak wavelength with junction temperature was studied, and the sensitive factor between peak wavelength and junction temperature was identified in [5], [6]. The relationship between chromaticity coordinates and junction temperature was determined in [7], [8]. The mathematical model of forward voltage as a function of junction temperature [9], [10], [11] is widely applied in the industry.…”

Section: Introductionmentioning

confidence: 99%

An Estimation Method for the Efficiency of Light-Emitting Diode (LED) Devices

Xue¹,

Yang²

2016

Journal of Power Electronics

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The efficiency of light-emitting diode (LED) devices is a significant factor that reflects the capability of these devices to convert electrical power into optical power. In this study, a method for estimating the efficiency of LED devices is proposed. An efficiency model and a heat power model are established as convenient tools for LED performance evaluation. Such models can aid in the design of LED drivers and in the reliability evaluation of LED devices. The proposed estimation method for the efficiency and heat power of LED devices is verified by experimentally testing two types of commercial LED devices.

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Chromatic, Photometric and Thermal Modeling of LED Systems With Nonidentical LED Devices

Cited by 29 publications

References 21 publications

Android Based LIGHTNET for Brightness and Color Temperature Control

Android Based LIGHTNET for Brightness and Color Temperature Control

Precise Dimming and Color Control of LED Systems Based on Color Mixing

An Estimation Method for the Efficiency of Light-Emitting Diode (LED) Devices

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