Evolution of Luminaires in the Automotive Lighting Industry towards LEDs requires Revolution of Thermal Management Mentor Graphics (Deutschland) GmbH

Format:

Conference/Event

Author/Creator:

Marovic, Marovic, author.

Contributor:

Molnar, Gabor

Poppe, András

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

With the change of luminaires from incandescent bulbs to LightEmitting Diodes (LED), we all know that the concept of thermalmanagement for this application is now redundant and new ways ofthinking need to be established. While incandescent bulbs mostlyradiate (~83%) and dissipate (~12%) heat loss and do not facethermal challenges related to the light source, LEDs mostlytransfer their heat loss (~60-85%) by conduction and are sensitiveto the thermal management. Therefore the efficiency of a 100Wincandescent bulb is ~5% while the efficiency of LEDs is~15-40%.The main thermal challenges with LEDs are to maintain a highcolor stability and life expectancy. LEDs in the automotiveindustry need to have lifelong durability. With LEDs being not onlymore efficient, but also valuable in terms of higher visibility andtherefore higher safety, the Economic Commission for Europe (ECE)set the Day-time running lamp (DRL) as mandatory from 2011 for allnew models of cars.Since exterior lights such as headlights and tail lights arealmost completely sealed systems, except for the very small airflowinlet, outlet and the small opening for regular incandescent bulbs,it is not realistic to allow a change of LEDs in case of a defect.Therefore high reliability and quality not only of the LED but alsoof the overall lamp design is compulsory since the change of awhole headlight is expensive and if it falls under warranty it canbe very expensive for the OEM and supplier of the system.This paper will address methods to achieve the best in classthermal management for the lighting industry. Starting fromselecting and measuring the thermal characteristics of LEDs tobeing able to choose the most suitable LED and conduct acceleratedageing tests, to thermal simulation of complex-shaped lightingsystems such as headlights, with concurrent Computational FluidDynamics (CFD) technology for higher quality products and a faster,more efficient and cost-effective development of lightingsystems

Notes:

Vendor supplied data

Publisher Number:

2012-01-0259

Access Restriction:

Restricted for use by site license