Abstract
Light-emitting diode (LED) arrays have attracted increased attention in the area of high power intelligent automotive headlamps because of their superiority in disposing of the power limit of an individual LED package and controllably luminous intensity and illumination pattern. The optical and chromatic performances of an LED array do not equal to the sum of individual LED packages' performances, as the thermal interactions between individual LED packages can't be ignored in the actual application. This paper presents a thermal-electrical-spectral (TES) model to dynamically predict the optical and chromatic performances of the LED array. The thermal-electrical (TE) model considering the thermal coupling effect in the LED array is firstly proposed to predict the case temperature of each individual LED package, and the Spectral power distributions (SPDs) of individual LED package is then decomposed by the extended Asym2sig model to extract the spectral characteristic parameters. Finally, the experimental measurements of the designed LED arrays operated under usage conditions are used to verify the TES model. Some validation case studies show that the prediction accuracy of the proposed TES model, which is expressed as a quadratic polynomial function of current and case temperature, can be achieved higher than 95%. Therefore, it can be concluded that this TES model offers a convenient method with high accuracy to dynamically predict the optical and chromatic performances of LED arrays at real usages.
Highlights
In recent decades, light-emitting diode (LED), as one of new generation solid-state lighting (SSL) light sources, draws worldwide attention in lighting and beyond-lighting industry, as it benefits in small volume, low power consumption and environmental friendship [1]
This paper presents a thermal-electrical-spectral (TES) model to dynamically predict the optical and chromatic performances of the Light-emitting diode (LED) array
The thermal-electrical (TE) model considering the thermal coupling effect in the LED array is firstly proposed to predict the case temperature of each individual LED package, and the Spectral power distributions (SPDs) of individual LED package is decomposed by the extended Asym2sig model to extract the spectral characteristic parameters
Summary
Light-emitting diode (LED), as one of new generation solid-state lighting (SSL) light sources, draws worldwide attention in lighting and beyond-lighting industry, as it benefits in small volume, low power consumption and environmental friendship [1]. Chen et al [25] used the PET theory to estimate the optical power, wall-plug efficiency and the coefficient of heat-dissipation for WLEDs and they combined the PET theory to a photo-detector system to estimate the dynamic/transient optical power and junction temperature for WLEDs [26] They improved the full PET theory to predict the fall and rise time of luminous flux for WLEDs by adding the photodiode as the measurement component [27]. Most of current researches develop models for the individual WLED packages, few of them consider the thermal coupling effect in predicting of the optical and chromatic performances for LED array. To achieve dynamic prediction of the optical and chromatic performances for LED array under different operation conditions, the thermal-electrical-spectral (TES) model that combines the Thermal-Electrical (TE) model with the SPD model is proposed.
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