Evaluating Thermocouple Measurement Techniques for Automotive Lighting

Poorman, Thomas; Bielecki, Joseph W.; Chang, Mojun; Khatib, Fadi El

doi:10.4271/2004-01-0665

Cited by 3 publications

(1 citation statement)

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“…Hence, the equation can be expressed as: (2) where, T is the temperature response of the heat sink SA is the surface area of the heat sink H is the convection coefficient TE is the environmental temperature This function can predict the heat sink base temperature for the inputs of heat sink area, environment temperature, and airspeed. By applying some algebra and solving a quadratic, likewise, an equation for heat sink effective surface area can be determined if the heat sink base temperature is known or constrained.…”

Section: A Prediction Modelmentioning

confidence: 99%

Thermal Considerations for LED Components in an Automotive Lamp

Bielecki¹,

Jwania²,

Khatib³

et al. 2007

Twenty-Third Annual IEEE Semiconductor Thermal Measurement and Management Symposium

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LED's in automotive lamp applications have been utilized effectively for functions with low light output requirements and for styling purposes. In recent years, high to ultra high power LED's are becoming a light source option for virtually every automotive lighting system. For exterior automotive lighting, these light sources have distinct advantages, but also unique thermal issues compared to conventional incandescent light sources. This study describes two methods of determining the junction temperature of an LED or array of LED's, direct and indirect. Both are based on temperature measurements, but the indirect method also requires a thermal resistance specified by the manufacturer. The direct method utilizes the intrinsic behavior of the junction voltage drop at low current (<0.1mA). A computer model for a typical plate finned heat sink design for a high power LED automotive lamp was experimentally calibrated. Design of experiment analysis was performed using a 3 level 3 input factor full factorial test matrix. The factors were defined as an active heat sink surface area, convection coefficient correlated to an airflow, and environment temperature. A quadratic model is generated from the results of the factors and significant interactions to the response.

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Section: A Prediction Modelmentioning

confidence: 99%