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research-article

Thermal Performance of an LED Light Engine for a Multi-Purpose Automotive Exterior Lighting System with Competing Board Technologies

[+] Author and Article Information
Umut Zeynep Uras

EVATEG Center Mechanical Engineering Department Ozyegin University 34794 Cekmekoy - ISTANBUL
umut.uras@ozu.edu.tr

Mehmet Arik

Professor Fellow of ASME EVATEG Center Mechanical Engineering Department Ozyegin University 34794 Cekmekoy - ISTANBUL
mehmet.arik@ozyegin.edu.tr

Enes Tamdogan

EVATEG Center Mechanical Engineering Department Ozyegin University 34794 Cekmekoy - ISTANBUL
enestamdogan@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4036403 History: Received December 16, 2016; Revised March 28, 2017

Abstract

In recent years, light emitting diodes (LEDs) have become an attractive technology for general and automotive illumination systems replacing old-fashioned incandescent and halogen systems. LEDs are preferable for automobile lighting applications due to its numerous advantages such as low power consumption, and precise optical control. Although these solid state lighting (SSL) products offer unique advantages, thermal management is one of the main issues due to severe ambient conditions and compact volume. Conventionally, tightly packaged double sided FR4 based printed circuit boards (PCBs) are utilized for both driver electronics components and LEDs. In fact, this approach will be a leading trend for advanced Internet of Things (IOT) applications embedded LED systems in the near future. Therefore, automotive lighting systems are already facing with tight-packaging issues. To evaluate thermal issues, a hybrid study of experimental and computational models are developed to determine the local temperature distribution on both sides of a 3-purpose automotive light engine for three different PCB approaches having different materials but the same geometry. Both results showed that FR4 PCB has a temperature gradient (TMaxBoard to TAmbient) of over 63°C. Moreover, a number of local hotspots occurred over FR4 PCB due to low thermal conductivity. Later, a metal core PCB is investigated to abate local hot spots. A further study has been performed with an advanced heat spreader board based on vapor chamber technology. Results showed that a thermal enhancement of 7.4% and 25.8% over Al metal core and FR4 based boards with the advanced vapor chamber substrate is observed. In addition to superior thermal performance, a significant amount of lumen extraction in excess of 15% is measured, and a higher reliability rate is expected.

Copyright (c) 2017 by ASME
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