低占空比脉冲驱动对白光LED的“视觉亮度”及光效影响研究初探  

Effects of low duty cycle pulse modulation to the"visual luminance"and efficacy of white LED

作　　者：郭雄彬 傅建新 王永常 陆巍[2] 叶辉[2] 

机构地区：[1]浙江省能源与核技术应用研究院,浙江杭州310012 [2]浙江大学现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《光学仪器》2010年第5期54-57,共4页Optical Instruments

基　　金：浙江省科技计划项目(2008F1011)

摘　　要：使用一种1:7占空比60Hz的脉冲电源驱动白光LED,与直流驱动相比,通过22人的观察实验,发现当两种驱动的LED在被试验者感知为"视觉亮度"一致的时候,所测得的脉冲驱动LED的实际光通量只有直流驱动LED光通量的66%,该结果与Masafumi Jinno等人在单色LED上测得的结果有一致的趋势。同时发现,脉冲驱动的LED在相同视觉亮度的时候其光效有一定的下降,这可以通过提高脉冲驱动电路的效率来改进。Two different kinds of circuit, pulse circuit with 60Hz frequency and 1：7 duty cycle and DC circuit, were used to drive two white light emitting diodes, respectively. Visual luminance of the two LEDs was considered to be equal by 22 observers with adjusting the power of the DC-driven LED, and then the emitting properties of the two LEDs were compared. Our study shows that the measured flux of pulse-driven LED is 66% of that DCdrived LED, this result is consistent with that reported by Masafumi Jinno whose measurement was done at monochrome LED. Meanwhile, the efficacy of the pulse-drived LED is found a little decreased, this could be improved by developing efficient pulse operation circuit.

关 键 词：脉冲驱动 白光LED 视觉亮度 

分 类 号：TN383.1[电子电信—物理电子学]