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.
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)
关键词
脉冲驱动
白光LED
视觉亮度
pulse circuit drive
white LED
visual luminance
