Junction temperature measurement of alternating current light-emitting-diode by threshold voltage method

被引:8
|
作者
Yao R. [1 ]
Zhang D. [1 ]
Zou B. [1 ]
Xu J. [2 ]
机构
[1] Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai
[2] Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, 16802, PA
关键词
alternating current light-emitting-diode (AC-LED); junction temperature measurement; optoelectronics; threshold voltage method;
D O I
10.1007/s12200-015-0533-8
中图分类号
学科分类号
摘要
Junction temperature of alternating current light-emitting-diode (AC-LED) has a significant effect on its stable light output and lifetime. The threshold voltage measurement is employed to characterize the junction temperature of AC-LED, due to its excellent merits in high efficiency and accuracy. The threshold voltage is measured when the driving current of an AC-LED rises to a reference on-set value from the zero-crossing node. Based on multiple measurements of threshold voltage at different temperatures, a linear relationship was uncovered between the threshold voltage and the junction temperature of AC-LED with the correlating factor of temperature sensitive parameter (TSP). Thereby, we can calculate the junction temperature with the TSP and threshold voltage once the AC-LED stays at thermal equilibrium state. The accuracy of the proposed junction temperature measurement technique was found to be ±3.2°C for the reference current of 1 mA. It is concluded that the method of threshold voltage is accurate and simple to implement, making it highly suitable for measuring the junction temperature of AC-LED in industry. © 2016, Higher Education Press and Springer-Verlag Berlin Heidelberg.
引用
收藏
页码:555 / 559
页数:4
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