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Wyszukujesz frazę "junction temperature" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Influence of junction temperature on the spectral power distribution of Light Emitting Diodes
Autorzy:
Budzyński, Ł
Powiązania:
https://bibliotekanauki.pl/articles/115467.pdf
Data publikacji:
2015
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
LED
junction temperature
spectral power
measurement
temperatura złącza
widmo mocy
pomiary
Opis:
This article describes electrical method for measuring junction temperature of high power LEDs. Measurement system consisting of a temperature controller and a thermostatic chamber was designed and constructed. A number of studies of LEDs in a typical thermal conditions that exist in luminaries were performed. Basing on these results, influence of junction temperature on luminous flux and spectral power distribution of LED was determined. Obtained results allow to optimize the construction of LED lighting fixtures, in the ambient temperature range from 0°C to 100°C, especially in the aspect of improving the photometric properties of the luminaire.
Źródło:
Challenges of Modern Technology; 2015, 6, 4; 3-7
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of cooling of automobile LED headlights without and with fins and finding comfortable operating conditions
Autorzy:
Mishra, Manbodh Kumar
Chandramohan, V. P.
Balasubramanian, Karthik
Powiązania:
https://bibliotekanauki.pl/articles/139930.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LED lights
automobile headlight
finite element method
junction temperature
safe working conditions
Opis:
LED light must be cooled to avoid reaching a certain temperature. Two different 3D practical domains of LED light are modelled, (i) square aluminium plate with a cylindrical plate and an LED module (model I), (ii) the same provision of model I with 25 fins (model II). ANSYS 16.0 is used for solving the problem. Temperature distribution, junction temperature (Tj ) and heat flux are estimated. Analyses are carried out for various ambient temperatures (Ta) and for different LED power dissipations (Q) to identify the safe operating conditions. In model I, it is found that 38% of working conditions go beyond the critical limit of Tj and it is reduced to 21.4% in model II. In model II, for low Ta of 30 and 40 C with all Q considered in this analysis are safer. If Ta is between 30 and 80 C, then Q must be maintained at 0.5 to 1.25 W. Beyond this, conditions are not safe.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 3; 295-314
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on silicon solar cell capacitance and its dependence on both temperature and incidence angle
Autorzy:
Sané, M
Barro, F I
Powiązania:
https://bibliotekanauki.pl/articles/102664.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vertical junction
capacitance
temperature
incidence angle
Opis:
The aim of this work is to investigate a theoretical study of a vertical junction silicon solar cell capacitance under monochromatic illumination. By solving the continuity equation and using a one dimensional model in frequency modulation, we derive the analytical expressions of both excess minority carrier density and photovoltage. Based on these expressions, the solar cell capacitance was calculated; we then exhibited the effects of both temperature and incidence angle on the solar cell capacitance.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 24; 9-12
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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