Thermal challenges in the future generation solid state lighting applications: light emitting diodes

Arık, Mehmet; Petroski, James; Weaver, Stanton

doi:10.1109/itherm.2002.1012446

Cited by 107 publications

(62 citation statements)

References 2 publications

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“…Nowadays, LED lighting is more and more often accepted as a light source in many applications due to the fact that LED lights have high light efficiencies, long operating lifetimes, small size, and are environmentally friendly [1,2]. Technological advancement in recent years enables a highbrightness LED to be used as a best choice.…”

Section: Introductionmentioning

confidence: 99%

Design of a digital controller for an LED driver with a digital dimming

Park

Nguyen

Seo

et al. 2014

IEICE Electron. Express

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This letter presents a new digital controller (DCL) with a new dimming method for high power-factor LED driver circuits. The core of proposed digital controller is based on a zero-voltage (ZVD) detection and a digital sine generator (DSG). By using the DSG, an effective dimming can be carried out easily. The proposed DCL was simulated and fabricated using the 1 μm-650 V DMOS process. The results obtained indicate that the inductor current waveform is in phase with the input voltage to gain a high power factor, because the inductor current is synchronized to the zero voltage signal from ZVD as expected. Also, the LED current changes according to the reference voltage, which is controlled by an external switch that adjusts the brightness of the LED.

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Section: Introductionmentioning

confidence: 99%

Design of a digital controller for an LED driver with a digital dimming

Park

Nguyen

Seo

et al. 2014

IEICE Electron. Express

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“…With the use of large LED arrays, it is possible to generate a large heat loads at the system level which can cause challenges for overall heat dissipation, especially when passive cooling is used. The large array with passive cooling techniques leads to elevated LED die temperatures, which have been linked to lower quantum efficiencies, shorter lifetimes, emission wavelength shifts and, catastrophic device failure [1][2][3][4][5][6]. A heat flux from a 900 high brightness LED chip, has already reached approximately 125 / [3] which is considered relatively high heat flux and comparable to heat generation in integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

Performance of LED street lights in hot environments

Saraiji

Harb

Hamdan

2011

Light in Engineering, Architecture and the Environment

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Solid-state LED street lights present significant benefits to street light operators as well as drivers and pedestrians. Questions remain, however, about their performance in high temperature conditions. This paper explores the performance of LED street light in one of the hottest regions in the world.Two LED street lights were installed in an actual street in the city of Al Ain, United Arab Emirates. The street was closed to the traffic and illuminance measurements were taken daily every 10 minutes throughout the summer of 2010. Temperature and relative humidity values were also taken inside the two light fixtures as well as outside the fixtures. The summer of 2010 had significantly high temperatures with one week in July reaching maximum ambient temperatures of 53 o C. This paper shows the Lux levels as well as the temperature and relative humidity data acquired in the field. Results show fairly stable light levels throughout the summer. The Lux levels did not change by more than 10% throughout the summer.

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“…In most cases, a single high performance LED replacement bulb can range from $40 to $120. High prices are mainly attributed to the packaging of the device, which is due to the advanced thermal management needed to properly remove heat from the system [Arik, 2002].…”

Section: Led Challengesmentioning

confidence: 99%

“…Generally HPLEDs fall between 1W -3W each, with arrays of LEDs used for higher lumen output requirements. Common HPLEDs output between 40-80 lumens [Arik, 2002]. HPLEDs are found in many different package types and in multiple applications.…”

Section: Common Led Package Typesmentioning

confidence: 99%

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The Design and Manufacture of a Light Emitting Diode Package for General Lighting

Krist¹

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Unfortunately, LEDs pose unique problems because advanced thermal management is required to remove the high heat fluxes generated by such relatively small devices. These problems have already been overcome with complex packaging and exotic materials, but high costs are preventing this technology from displacing current lighting technologies.The purpose of this study is to develop a low-cost LED lighting package capable of successfully managing heat. Several designs were created and analyzed based on cost, thermal performance, ease of manufacturing, and reliability. A unique design was created which meet these requirements. This design was eventually assembled as a prototype and initial testing was conducted. This thesis reviews the design process and eventual results of the LED package design.v ACKNOWLEDGEMENTS

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Thermal challenges in the future generation solid state lighting applications: light emitting diodes

Cited by 107 publications

References 2 publications

Design of a digital controller for an LED driver with a digital dimming

Design of a digital controller for an LED driver with a digital dimming

Performance of LED street lights in hot environments

The Design and Manufacture of a Light Emitting Diode Package for General Lighting

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