LED module with thermoelectric cooling and junction temperature monitoring

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

One of the main properties affecting the LED lifetime is the junction temperature. Without any feedback on the LED junction temperature or environmental temperature the feed current levels has to be rated with large margin to ensure safe operation area. However depending on the environment the led current and therefore the light level could be significantly higher if there would be a temperature feedback. A led module with thermoelectric cooler and an electric junction temperature measurement was developed. The module includes four LEDs, their electronic controller and a Peltier cooler. The test setup includes a heat sink and a cooling fan. This setup gives possibilities to create higher light levels with safe temperatures in variable environments or even high temperature environments. The direct feedback on the junction temperature can be utilized as temperature monitor or temperature limiter. When the temperature reaches the allowed limit, the cooler can be utilized for keeping the temperature at safe levels for ensuring desired LED lifetime. The temperature measurement is based on measuring the LED forward voltage during short 200 us constant low current pulses fed to the LED every 20 ms. The junction temperature is a function of the measurement current level and the junction temperature. The measurement is used for controlling the cooler and limiting the temperature rise at the LED junction.
Original languageEnglish
Title of host publicationBook of Abstracts
Subtitle of host publicationICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark
PublisherAalborg University
Publication statusPublished - 2012
MoE publication typeNot Eligible

Fingerprint

thermoelectric cooling
light emitting diodes
modules
coolers
temperature
temperature measurement
high temperature environments
life (durability)
heat sinks
low currents
fans

Keywords

  • plasma spray
  • thermoelectrics
  • oxides

Cite this

Huovila, H., & Tervo, J. (2012). LED module with thermoelectric cooling and junction temperature monitoring. In Book of Abstracts: ICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark [295] Aalborg University.
Huovila, Henrik ; Tervo, Jyrki. / LED module with thermoelectric cooling and junction temperature monitoring. Book of Abstracts: ICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark. Aalborg University, 2012.
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title = "LED module with thermoelectric cooling and junction temperature monitoring",
abstract = "One of the main properties affecting the LED lifetime is the junction temperature. Without any feedback on the LED junction temperature or environmental temperature the feed current levels has to be rated with large margin to ensure safe operation area. However depending on the environment the led current and therefore the light level could be significantly higher if there would be a temperature feedback. A led module with thermoelectric cooler and an electric junction temperature measurement was developed. The module includes four LEDs, their electronic controller and a Peltier cooler. The test setup includes a heat sink and a cooling fan. This setup gives possibilities to create higher light levels with safe temperatures in variable environments or even high temperature environments. The direct feedback on the junction temperature can be utilized as temperature monitor or temperature limiter. When the temperature reaches the allowed limit, the cooler can be utilized for keeping the temperature at safe levels for ensuring desired LED lifetime. The temperature measurement is based on measuring the LED forward voltage during short 200 us constant low current pulses fed to the LED every 20 ms. The junction temperature is a function of the measurement current level and the junction temperature. The measurement is used for controlling the cooler and limiting the temperature rise at the LED junction.",
keywords = "plasma spray, thermoelectrics, oxides",
author = "Henrik Huovila and Jyrki Tervo",
note = "Poster abstract Project code: 41968",
year = "2012",
language = "English",
booktitle = "Book of Abstracts",
publisher = "Aalborg University",
address = "Denmark",

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Huovila, H & Tervo, J 2012, LED module with thermoelectric cooling and junction temperature monitoring. in Book of Abstracts: ICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark., 295, Aalborg University.

LED module with thermoelectric cooling and junction temperature monitoring. / Huovila, Henrik; Tervo, Jyrki.

Book of Abstracts: ICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark. Aalborg University, 2012. 295.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - LED module with thermoelectric cooling and junction temperature monitoring

AU - Huovila, Henrik

AU - Tervo, Jyrki

N1 - Poster abstract Project code: 41968

PY - 2012

Y1 - 2012

N2 - One of the main properties affecting the LED lifetime is the junction temperature. Without any feedback on the LED junction temperature or environmental temperature the feed current levels has to be rated with large margin to ensure safe operation area. However depending on the environment the led current and therefore the light level could be significantly higher if there would be a temperature feedback. A led module with thermoelectric cooler and an electric junction temperature measurement was developed. The module includes four LEDs, their electronic controller and a Peltier cooler. The test setup includes a heat sink and a cooling fan. This setup gives possibilities to create higher light levels with safe temperatures in variable environments or even high temperature environments. The direct feedback on the junction temperature can be utilized as temperature monitor or temperature limiter. When the temperature reaches the allowed limit, the cooler can be utilized for keeping the temperature at safe levels for ensuring desired LED lifetime. The temperature measurement is based on measuring the LED forward voltage during short 200 us constant low current pulses fed to the LED every 20 ms. The junction temperature is a function of the measurement current level and the junction temperature. The measurement is used for controlling the cooler and limiting the temperature rise at the LED junction.

AB - One of the main properties affecting the LED lifetime is the junction temperature. Without any feedback on the LED junction temperature or environmental temperature the feed current levels has to be rated with large margin to ensure safe operation area. However depending on the environment the led current and therefore the light level could be significantly higher if there would be a temperature feedback. A led module with thermoelectric cooler and an electric junction temperature measurement was developed. The module includes four LEDs, their electronic controller and a Peltier cooler. The test setup includes a heat sink and a cooling fan. This setup gives possibilities to create higher light levels with safe temperatures in variable environments or even high temperature environments. The direct feedback on the junction temperature can be utilized as temperature monitor or temperature limiter. When the temperature reaches the allowed limit, the cooler can be utilized for keeping the temperature at safe levels for ensuring desired LED lifetime. The temperature measurement is based on measuring the LED forward voltage during short 200 us constant low current pulses fed to the LED every 20 ms. The junction temperature is a function of the measurement current level and the junction temperature. The measurement is used for controlling the cooler and limiting the temperature rise at the LED junction.

KW - plasma spray

KW - thermoelectrics

KW - oxides

M3 - Conference abstract in proceedings

BT - Book of Abstracts

PB - Aalborg University

ER -

Huovila H, Tervo J. LED module with thermoelectric cooling and junction temperature monitoring. In Book of Abstracts: ICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark. Aalborg University. 2012. 295