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利用蒙特卡洛方法对阵列化互连LED模组的可靠寿命进行了模拟,假设分档后的大功率白光LED的正向电压符合正态分布,额定电流下的寿命符合对数正态分布,且寿命和电流、温度的关系符合Eying模型,研究了n×n(6≤n≤12)LED阵列的寿命分布。模拟结果表明,对于n×nLED阵列,寿命随LED数目的增加没有下降反而略有增加,表明对多数目LED模组采用阵列化互连电路较传统串并联电路具有优势,能提高阵列的可靠性;对系统采用电流降额使用,可靠寿命随着电流降额量的增大而增大,电流降额越大,寿命增大越多;多数目LED大阵列结合较高的电流降额量能大幅度提高系统的可靠性。
The Monte-Carlo method is used to simulate the reliable life of LED array. Assuming that the forward voltage of the high-power white LED after binning meets the normal distribution, the life under rated current meets the logarithm normal distribution, The relationship between lifetime and current and temperature is in accordance with Eying model, and the life distribution of n × n (6≤n≤12) LED arrays is studied. The simulation results show that for the n × nLED array, the lifetime increases slightly with the increase of the number of LEDs, but slightly increases, indicating that the array interconnection circuit is superior to the traditional series-parallel interconnection circuit for the majority of LED modules, which can improve the reliability of the array ; The system uses the current derating, reliable life expectancy increases with the current derating increases, the current derating greater, the more life increases; the majority of large arrays of LEDs combined with a high current derating can be large Amplitude increases the reliability of the system.