Iero Demetrio, Merenda Massimo, Carotenuto Riccardo, Pangallo Giovanni, Rao Sandro, Brezeanu Gheorghe, Corte Francesco G Della
Department of Information Engineering, Infrastructure and Sustainable Energy (DIIES), Mediterranea University of Reggio Calabria, 89124 Reggio Calabria, Italy.
HWA srl-Spin Off dell'Università Mediterranea di Reggio Calabria, Via Reggio Campi II tr. 135, 89126 Reggio Calabria, Italy.
Sensors (Basel). 2021 Apr 29;21(9):3113. doi: 10.3390/s21093113.
Extending the lifetime of power light-emitting diodes (LEDs) is achievable if proper control methods are implemented to reduce the side effects of an excessive junction temperature, . The accuracy of state-of-the-art LED junction temperature monitoring techniques is negatively affected by several factors, such as the use of external sensors, calibration procedures, devices aging, and technological diversity among samples with the same part number. Here, a novel method is proposed, indeed based on the well-known technique consisting in tracking the LED forward voltage drop when a fixed forward current is imposed but exploiting the voltage variation with respect to room temperature. This method, which limits the effects of sample heterogeneity, is applied to a set of ten commercial devices. The method led to an effective reduction of the measurement error, which was below 1 °C.
如果实施适当的控制方法以减少过高结温的副作用，那么延长功率发光二极管（LED）的使用寿命是可以实现的。最先进的LED结温监测技术的准确性受到多种因素的负面影响，例如外部传感器的使用、校准程序、器件老化以及相同部件编号的样品之间的技术差异。在此，提出了一种新颖的方法，该方法实际上基于一种众所周知的技术，即在施加固定正向电流时跟踪LED的正向电压降，但利用相对于室温的电压变化。这种方法限制了样品异质性的影响，并应用于一组十个商用器件。该方法有效降低了测量误差，误差低于1°C。
