Optimization of the thermal distribution of multi-chip LED package

Abdelmlek, Khaoula Ben; Araoud, Zouhour; Charrada, K.; Zissis, Georges

doi:10.1016/j.applthermaleng.2017.07.136

Cited by 53 publications

(14 citation statements)

References 20 publications

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“…From Ben Abdelmlek et al (2017), the optimal pitch of 3 × 3 LED array and 2.82 mm length, the translation from square to circular geometry permits us to put ten chips instead of nine with respect of the same pitch (distance between two chips), as it is shown in Figure 18.…”

Section: Resultsmentioning

confidence: 99%

Heat transfer enhancement of circular and square LED geometry

Salah¹,

Hamida

2018

HFF

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Purpose The purpose of this paper is to compare the thermal effect between square and circular geometry of light emitting diode (LED) with respect of the same surface for the intent of reducing the junction temperature. Design/methodology/approach The heat equation is presented in a dimensionless form. To solve it numerically subject to the boundary conditions, the authors realized a three-dimensional code with Comsol Multiphysics. Findings The model is validated with previously published works. The authors found a good agreement. Originality/value New design of heat sink is improved for circular LED and a reduction of 18 per cent of the junction temperature is permitted. The authors study the influence of various parameters: number and length of fins and number and width of splits. New distribution of multichip LED in circular geometry permits to put 42 chips instead of 36 chips with respect of the same surface and pitch and with reduction of the junction temperature by 16 per cent.

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Section: Resultsmentioning

confidence: 99%

Heat transfer enhancement of circular and square LED geometry

Salah¹,

Hamida

2018

HFF

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“…Abdelmlek [16] studied the number and arrangement of LED-chips on the heat-sink owing to the different effect of junction temperature. Later, the same group also investigated the optimization of different chip size, disposition on different substrate [17]. These authors also proposed a new thermal resistance model to precise estimate the junction and phosphor temperature, which proves the feasibility of the estimated model [18].…”

Section: Introductionmentioning

confidence: 90%

Optimum Composition of Vacuum Content in a Spiral-Like Flexible Chimney-Based LED Bulb1

2020

Journal of Electronics and Sensors

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This paper introduced the gas flow and optimization of a spiral-like flexible chimneybased LED bulb by a combined mathematical and experimental study. A mathematical model of spiral flexible LED bulb considering nature convection, radiation and heat transfer was established by the FLOEFD software based on the finite element method (FEM), and was also compared with the experimental result. The effect of chimney-self based and vacuum content on the thermal performance of a bulb was studied. A thermal resistance model was proposed for analytical model. Compared with the filament with a stretch height of 3cm, the chimney effect can reduce the average junction temperature of filament by 6.38 ℃ (through the experiment) and 6.48 ℃ (through the simulation) respectively. The results revealed that the chimney effect has a huge impact on the gas flow in the bulb. The cause of the phenomenon is that flexible LED filament can improve the gas flow by changing self-shape instead of other cooling device. A vacuum content was introduced in the bulb and composition was optimized by using analytical model. The filament temperature in optimized bulb could decrease 6 0C than full filled with helium.

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“…In the latest decade, the electro-optic conversion efficiency of the light emitting diode (LED) was about 10%-15%. The temperature distribution of high-power LED lamps has greater negative influence on the efficiency [1][2][3]. Much literature focused on experimental method to reduce the maximum temperature of radiator of high-power LED lamps [4][5][6][7], additionally a 3-D numerical model was used in open literature to study the steady-state temperature distribution [8].…”

Section: Introductionmentioning

confidence: 99%