可调色温可调光光源是实现智能照明的基础。充分利用发光二极管(LED)光源的可控性, 采用冷暖白光LED和两通道脉冲宽度调制(PWM)法, 设计研制成功了可调色温可调光动态照明光源。从人们关心的照明光源参数出发, 依据选用冷白LED光源和暖白LED光源光度色度参数, 建立了给定光度量输出时冷白LED光源控制占空比计算的模型, 探讨了基于色温目标控制参数占空比的约束条件。实验表明, 混色光源调节色温时光通量的起伏小于2.5%, 相关色温偏差在10 K以内, 调光时色温基本不变, 设计结果良好; 同时, 在分析过程中实际设计混色光源参数和选择光源的性能指标参数一致, 表明这种方法既直观又具有很好的实用性。

Dimming lighting sources are the basic parts of intelligent illumination. Fully utilizing the controllable performance of light emitting diode (LED), the dimming dynamic lighting LEDs are made successfully by cold/warm white LEDs and two channels′ pulse width modulation (PWM). According to photometric and colorimetric quantities of the selected cold/warm white LEDs, and the needed mixed color lighting sources, calculation model of duty cycle which controls the outputs of them are established. The constraints of duty cycle with correlated color temperature (CCT) as an objective parameter are also analyzed. Experiments show that not only the up-and-down luminous flux is less than 2.5%, and the deviation of CCT is less than 10 K when CCT of the mixed color lighting sources are changed, but also the CCT keeps unchanged when the output luminous flux is altered. Meanwhile, the analytic process of actual parameter design of mixed color lighting sources is in accordance with the selected performance parameters of lighting soures, which shows that the method is direct and has good practicality.