实现色温自动控制的白光LED照明系统设计  

Design of Auto Control of Color Temperature for White-LED Lighting System

作　　者：李毓钦[1,2] 陈长缨[1,2] 王媛[2] 刘平宇[1,2] 魏其锋[1,2] 

机构地区：[1]光电信息与传感技术广东普通高校重点实验室暨南大学,广州510632 [2]暨南大学光电工程系,广州510632

出　　处：《固体电子学研究与进展》2014年第2期157-162,共6页Research & Progress of SSE

基　　金：中央高校基本科研业务费专项基金资助项目(11609506)

摘　　要：荧光粉发光LED作为白光光源在照明领域有着广泛的应用。长时间工作,荧光粉发光LED将出现色温偏移现象。荧光粉发光LED的色温偏移与芯片衰减和荧光粉衰减有关。提出了一种能同时考虑芯片衰减和荧光粉衰减的数学模型。从理论上分析了芯片衰减和荧光粉衰减对荧光粉发光LED的色坐标及色温变化的影响。提出了一种利用蓝光LED与荧光粉发光LED混合,通过对蓝光LED进行负反馈控制,保证蓝光辐射在全白光中的辐射功率比值恒定,从而实现色温稳定的白光LED照明系统。Phosphor converted LED has extensive application in lighting field as white light source. After long time working, its output color temperature will be shifting, which is mostly caused by chip degradation and phosphor layer degradation. A mathematical model is proposed considering these two variables, and theoretical analysis is made for the dependence of color tem- perature and chromaticity coordinate on the degradation of phosphor converted LED including chip and phosphor. A new white LED lighting system, with mixed blue LED and phosphor converted LED is proposed to achieve stable color temperature, by the means of keeping the ratio of blue-ray radiation to the whole radiation constant through negative feedback.

关 键 词：光学设计 色温稳定 反馈控制 色品坐标 

分 类 号：TN312.8[电子电信—物理电子学]