Characterization of thermal resistance coefficient of high-power LEDs

Jayasinghe, Lalith; Gu, Yuandong; Narendran, Nadarajah

doi:10.1117/12.682585

Cited by 45 publications

(28 citation statements)

References 8 publications

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“…Thermal resistance coefficient depends on the power dissipation at the junction, ambient temperature, amount of heat sink and the orientation of the heath sink [2,3]. For the purpose of real-time health monitoring and prognostics, we assume the average power dissipation of the LED remains constant and ambient temperature, amount of heat sink and orientation of the heat sink remain same.…”

Section: Led Health Monitoringmentioning

confidence: 99%

“…It is impossible to measure the p-n junction temperature directly as it is impossible to reach the p-n junction. However, it is possible to estimate this value by measuring the temperature at a nearest point to the p-n junction, and then use the following one-dimensional heat conduction equation to estimate the junction temperature [2,3].…”

Section: Led Health Monitoringmentioning

confidence: 99%

“…Numerous papers have been published that characterise the reliability and thermal behaviour of LEDs [1][2][3][4][5][6][7][8][9]. Recent publications have detailed the importance of temperature on the reliability of LEDs and the need for suitable packaging to ensure that appropriate heat is extracted [4].…”

Section: Introductionmentioning

confidence: 99%

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Prognostics and Health Monitoring of High Power LED

et al. 2012

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Abstract:Prognostics is seen as a key component of health usage monitoring systems, where prognostics algorithms can both detect anomalies in the behavior/performance of a micro-device/system, and predict its remaining useful life when subjected to monitored operational and environmental conditions. Light Emitting Diodes (LEDs) are optoelectronic micro-devices that are now replacing traditional incandescent and fluorescent lighting, as they have many advantages including higher reliability, greater energy efficiency, long life time and faster switching speed. For some LED applications there is a requirement to monitor the health of LED lighting systems and predict when failure is likely to occur. This is very important in the case of safety critical and emergency applications. This paper provides both experimental and theoretical results that demonstrate the use of prognostics and health monitoring techniques for high power LEDs subjected to harsh operating conditions.

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Section: Led Health Monitoringmentioning

confidence: 99%

Section: Led Health Monitoringmentioning

confidence: 99%

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Prognostics and Health Monitoring of High Power LED

et al. 2012

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“…However, the studies on thermal resistance of low power devices (e.g. LED [9], transistors [10]) may not be applicable to high power IGBTs due to the dramatic difference in material and geometry. IGBT thermal resistance dependence on power loss is studied and proved by experiments in [11], whereas it is difficult to apply the results in circuit simulations due to a lack of quantitative conclusion.…”

Section: Introductionmentioning

confidence: 99%

“…The correlation of thermal resistance and ambient temperature has been studied in [9]- [12] for the semiconductor devices. However, the studies on thermal resistance of low power devices (e.g.…”

Section: Introductionmentioning

confidence: 99%

A temperature-dependent thermal model of IGBT modules suitable for circuit-level simulations

Wang

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-A basic challenge in the IGBT transient simulation study is to obtain realistic junction temperature, which demands not only accurate electrical simulation but also precise thermal impedance. This paper proposed a novel thermal impedance model considering of local temperature effects through Finite Element Method (FEM) simulation. The proposed method is applied to a case study of 1700 V/1000 A IGBT module. Furthermore, a testing setup the studied IGBT open module and an ultra-fast infrared (IR) camera has been constructed to validate the proposed model.

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Sprayable, Superhydrophobic, Electrically, and Thermally Conductive Coating

Baldelli

Barona

et al. 2020

Adv Materials Inter

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A simple to make, multifunctional, heatable, and sprayable superhydrophobic and electrically conductive coating is developed by dispersing carbon nanofibers (CNFs) into a water repelling polymer matrix. The developed coating exhibits an average static and hysteresis contact angles of 160° and 5°, respectively. An electrical conductivity of 1100 S m−1 and a thermal conductivity of 0.001 W m−1 K−1 are obtained with a sample of dimensions: 3 cm × 1 cm × 20 µm. A 12 µm thick coating under an average electric current of 75 mA reaches to a surface temperature of more than 140 °C for a dry coating. The coating when in contact with ice or water (water at 25 °C for 300 h, and at 85 °C for less than an hour) does not show a deterioration of wetting performance. Furthermore, it is shown how this coating can be used to mitigate the ice formation on cold surfaces. The ability of application of the developed coating to various substrates is also shown.

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Characterization of thermal resistance coefficient of high-power LEDs

Cited by 45 publications

References 8 publications

Prognostics and Health Monitoring of High Power LED

Prognostics and Health Monitoring of High Power LED

A temperature-dependent thermal model of IGBT modules suitable for circuit-level simulations

Sprayable, Superhydrophobic, Electrically, and Thermally Conductive Coating

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