性能退化量分布LED可靠性评估

摘要

Most methods for the LED reliability evaluation are based on the pseudo life of product,and this paper proposes a LED reliability evaluation method based on degradation amount distribution. The method was used to predict the degradation amount of follow-up time according to index model and calculate the cumulative failure probability in every moment by β-distribution uniform expression method,and then,LED reliability function under constant stress was confirmed based on accelerated model. Finally,Based on the test for a certain type of LED lamp in China, its service life was estimated as 77 100 h, which verified the feasibilityand effectiveness of the method.%针对LED可靠性评估的方法大部分均基于样品伪寿命这一现象,提出基于退化量分布的LED可靠性评估方法。先依据指数模型预测后续时刻的退化量,再通过β分布统示法求出各时刻的累积失效概率,然后根据加速模型确定常应力下LED的可靠度函数。以国内某型LED灯具为实验对象,求出该型灯具寿命估计值为77100 h,验证方法的实用性、有效性。