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Junction temperature

About: Junction temperature is a research topic. Over the lifetime, 5058 publications have been published within this topic receiving 58643 citations.


Papers
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Journal ArticleDOI
TL;DR: A highly modular, integrated, and compact drive is achieved compared to the nonintegrated version, and an experimental setup is built to validate the results of the introduced multiphysics models.
Abstract: In this article, a circumscribing polygon integrated modular motor drive topology with shared cooling for the power converter and the electrical machine is proposed and benchmarked with the nonintegrated version. The proposed topology is applied on an axial flux permanent magnet synchronous machine. The topology is capable of mechanically mounting the power converter, sufficiently cooling both the power converter and the electrical machine, and combining both of them into the same housing. The mechanical and the thermal design are done to ensure thermal decoupling between the power converter and the motor winding, and to provide a low thermal resistance from the power converter and the electrical machine to the ambient. Due to the limited space available for the power converter module, wide bandgap semiconductor technology is chosen for the implementation of the converter module, thanks to their small package size and low power losses. A highly modular, integrated, and compact drive is achieved compared to the nonintegrated one. A computational fluid dynamics (CFD) model is developed for one module of the proposed integrated drive to evaluate the maximum current that can be injected by one converter module without exceeding the junction temperature limit of the switches and the maximum winding temperature. An experimental setup is built to validate the results of the introduced multiphysics models.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the junction temperature of green and blue GaInN/GaN quantum well light emitting diode (LED) dies is analyzed by micro-Raman, photoluminescence, cathodolumininescence mapping, and forwardvoltage methods and compared to finite element simulations.

28 citations

Journal ArticleDOI
TL;DR: In this paper, a high power LED cooling system with ferrofluid was investigated under various input voltages and magnetic fields and compared with air and water working fluids, and the results showed that the cooling and optical performances could be improved by applying the external magnetic field.

28 citations

Journal ArticleDOI
TL;DR: In this paper, an InGaN-based light-emitting diode with a p-GaN/nGaN barrier junction was fabricated and investigated, and the improved current-spreading ability, longer life-time, driving at medium current injection (60 mA), as well as significantly enhanced electrostatic discharge performance, were obtained.
Abstract: An InGaN-based light-emitting diode with a p-GaN/n-GaN barrier junction is fabricated and investigated. Due to the built-in potential induced by this junction, superior current spreading performance is achieved. In addition, the suppression of the current-crowding phenomenon yields a reduced parasitic effect. Therefore, under an injection current of 20 mA, improved behaviors, including lower turn-on voltage, lower parasitic series resistance, and reduced p-n junction temperature, are achieved. In addition, due to the improved current-spreading ability, longer life-time, driving at medium current injection (60 mA), as well as significantly enhanced electrostatic discharge performance, are obtained.

28 citations

Proceedings ArticleDOI
08 Apr 2010
TL;DR: In this article, the optimal choice of LEDs and thermal management solutions for a street-lighting application was found for different high-end white power LEDs from different LED vendors, where the primary concern was the (real) junction-to-heatsink thermal resistance of the LED or LED assembly and the real junction temperature and the actual light output of individual LEDs under test.
Abstract: Different high-end white power LEDs from different LED vendors were studied. The aim of the study was to find the optimal choice of LEDs and thermal management solutions for a street-lighting application. The primary concern was the (real) junction-to-heatsink thermal resistance of the LED or LED assembly and the real junction temperature and the actual light output of the individual LEDs under test. Since in many cases the junction-to-heatsink thermal resistance showed temperature dependence, like-with-like comparison in terms of light output characteristics was done as function of the real junction temperature instead of the reference temperature.

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023118
2022277
2021233
2020287
2019334
2018303