Method for in-situ power LEDs' junction temperature measurements

Mashkov, Petko; Gyoch, Berkant; Penchev, Stanislav; Beloev, Hristo

doi:10.1109/isse.2012.6273116

Cited by 7 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This well-known method presupposes the almost linear dependence between forward voltage drop and junction temperature in a distinct range of operating conditions [5][6][7]. Our previous investigations show that the proposed procedure is suitable for the discussed application, provides reliable in-situ results, and does not require expensive equipment.…”

Section: Problem and Motivationmentioning

confidence: 91%

“…However, experiments show that it is necessary to assess the forward voltage drop of every LED array in order to obtain P th,array sufficiently accurate. The used measurement equipment should have an accuracy of at least 0.1% for measuring I F and U F [7]. …”

Section: Problem and Motivationmentioning

confidence: 99%

“…Our previous investigations show that the proposed procedure is suitable for the discussed application, provides reliable in-situ results, and does not require expensive equipment. For single LED, the temperature coefficient of voltage varies from approximately -3 to -5 mV/K [7]. However, high-flux, multi-die arrays have quite different characteristics.…”

Section: Problem and Motivationmentioning

confidence: 99%

See 2 more Smart Citations

Method for in-situ thermal load testing of high-brightness LED arrays

Mashkov

Gyoch

Penchev

et al. 2013

Proceedings of the 36th International Spring Seminar on Electronics Technology

Self Cite

View full text Add to dashboard Cite

Frequently the direct assessment of the LEDs' junction temperature as one of the main parameters to evaluate the extent of the thermal load is possible only under laboratory conditions. In this paper we present the development of a cheap and reliable experimental method to establish the junction temperature of high-brightness LED arrays under operating conditions. It is based on the insitu determination of the temperature dependence of the LEDs' forward voltage drop. Three different types of high-flux LED arrays are investigated (nominal forward voltage between 18 and 45 V) at various ambient conditions (air temperatures from 20ºC to 45ºC) and values of forward current ranging from 270 mA to 720 mA. Recommendations on calibration, calculation and junctions' temperatures evaluation are presented. The developed method also allows to achieve reliable results of the in situ thermal performance of the entire lamps consisting of high-flux LED arrays mounted on a cooler.

show abstract

Section: Problem and Motivationmentioning

confidence: 91%

Section: Problem and Motivationmentioning

confidence: 99%

Section: Problem and Motivationmentioning

confidence: 99%

See 1 more Smart Citation