探讨利用脉冲源供电减少节能LED的热积累  

Discussion on using pulse-current source to drive LED to reduce heat-accumulation

作　　者：赵伟强[1] 刘慧[1] 蔡骞[2] 刘建[1] 胡志刚[3] 

机构地区：[1]中国计量科学研究院,北京100013 [2]中国测试技术研究院,四川成都610021 [3]江西省计量测试研究院,江西南昌330002

出　　处：《中国测试》2010年第6期16-17,81,共3页China Measurement & Test

摘　　要：大功率发光二极管(LED)在点亮过程中,随着内部PN结温度升高,大功率LED的总光通量和发光效能将明显下降。利用脉冲电流源驱动LED,可以有效减少其"热积累"。LED总光通量在直流模式下随点燃时间下降,在脉冲模式下则不随点燃时间变化。此外,在相同的电流值下,脉冲模式下的LED电流发光能效比直流模式下的效能高,可以减少温度上升带来的效率损失。With the high-power light emitting diode（LED） turning on,the LED total luminous flux and luminous efficiency will be significantly decreased with the increase of the internal PN junction temperature.Using pulse-current source to drive LED can effectively reduce heat accumulation problem.The LED total luminous flux decreases with the increase of time in the DC mode,but it does not change in the pulse mode.In addition,at the same current value,the current efficiency of LED in pulse mode is higher than that in the DC mode,reducing the loss of efficiency of the rise in temperature.

关 键 词：计量学 节能 大功率LED 脉冲电流源 热积累 

分 类 号：TN78[电子电信—电路与系统] TB96[机械工程—光学工程]