Methods for estimating junction temperature of AC LEDs

Asiri Jayawardena; Yi-wei Liu; Nadarajah Narendran

doi:10.1117/12.904056

23 September 2011 Methods for estimating junction temperature of AC LEDs

Asiri Jayawardena, Yi-wei Liu, Nadarajah Narendran

Proceedings Volume 8123, Eleventh International Conference on Solid State Lighting; 81230I (2011) https://doi.org/10.1117/12.904056
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Light-emitting diodes operating on alternating current (AC) are gaining popularity in lighting applications. The junction temperature of an LED significantly influences performance. Although there are many proven methods for estimating the junction temperature of direct current (DC) LEDs, only a few methods have been proposed for AC LEDs. Two different methods were investigated and analyzed for their accuracy in estimating AC LED junction temperature: a low reference current pulse used to measure the voltage across the junction, and an active cooling system to recover the first half cycle current (rms). Method details are provided. The results suggest that the voltage drop method for AC LEDs is a viable method to estimate junction temperature.

Citation Download Citation

Asiri Jayawardena, Yi-wei Liu, and Nadarajah Narendran "Methods for estimating junction temperature of AC LEDs", Proc. SPIE 8123, Eleventh International Conference on Solid State Lighting, 81230I (23 September 2011); https://doi.org/10.1117/12.904056

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