交流LED频闪效应研究

发布时间：2018-08-30 15:20

【摘要】：随着固态照明技术的飞速发展,LED光源凭借其节能环保、发光效率高等优点在照明领域得到了广泛的应用。传统LED光源都是直流LED光源,其在市电供电时必须配备AC/DC和恒流源装置,这不仅增加了光源的成本,还造成了能源浪费,并限制了LED灯具的寿命。交流LED光源由于其可以直接用交流驱动，凭借成本低、体积小、转换效率高等优点逐渐成为照明行业发展的新趋势,但是由于交流LED光源的光强是随时间变化的,容易引起频闪现象。频闪效应是评价照明质量重要参考要素之一,它不仅影响人们的视觉舒适,而且能够诱发偏头痛等身体方面的疾病。因此,本文重点对交流LED频闪效应现象展开研究。论文以一种驱动波形可通过编程控制的LED光源作为研究对象,采用主观心理学实验的方法来研究交流LED的频闪效应可见阈值和可接受闽值情况。首先,研究了驱动波形对频闪可见阈值的影响,研究结果表明,同频率下方波和正弦波频闪可见闽值存在一个比例关系；随着正弦波驱动的光源频率增加,频闪可见阈值增加；光源的照度对频闪可见阈值有显著性影响。对于室内交流LED照明情况,随着照度增加,频闪可见阈值呈现U型趋势,频闪效应最明显的照度范围在10到1001ux之间；对于室外交流LED照明情况,在一定范围内随着照度增加,频闪可见闽值越来越小直至不变。其次,论文采用不同频率正弦波叠加而成的复杂波形对频闪可见闽值模型进行了验证,结果表明闽值模型对预测频闪可见性有着很好的鲁棒性。最后,论文通过与直流LED照明情况对比,研究了不同调制深度的交流LED照明情况对频闪可接受性的影响。研究结果表明,调制深度对频闪可接受性有显著性影响,随着调制深度增加,被试对交流LED产生的“闪烁”和“运动伪像”现象厌烦程度增加；对于100Hz频率50%占空比的方波交流LED照明情况,频闪效应的可接受闽值为75%调制深度,频闪效应的可见闽值为17.4%。可以看到,频闪可接受阈值远大于频闪可见阈值。
[Abstract]:With the rapid development of solid-state lighting technology, LED light source has been widely used in lighting field because of its advantages of energy saving and environmental protection, high luminous efficiency and so on. The traditional LED light source is DC LED light source, it must be equipped with AC/DC and constant current source device when supplying electricity to the city, which not only increases the cost of light source, but also causes energy waste, and limits the life of LED lamps and lanterns. Ac LED light source has become a new trend of lighting industry because of its advantages of low cost, small volume and high conversion efficiency, because it can be driven directly by AC, but the light intensity of AC LED light source changes with time. It is easy to cause stroboscopic phenomenon. Stroboscopic effect is one of the important reference factors in the evaluation of lighting quality. It not only affects people's visual comfort, but also induces physical diseases such as migraine. Therefore, this paper focuses on the phenomenon of AC LED stroboscopic effect. In this paper, a programmable controlled LED light source with driving waveform is used to study the visible threshold and acceptable threshold of the stroboscopic effect of AC LED by using the method of subjective psychological experiment. Firstly, the effect of driving waveform on the visible threshold of stroboscopic is studied. The results show that there is a proportional relationship between the visible threshold of stroboscopic and that of the wave under the same frequency, and the threshold increases with the increase of the frequency of the light source driven by the sinusoidal wave. The illuminance of the light source has a significant effect on the stroboscopic visible threshold. For indoor AC LED lighting, with the increase of illumination, the visible threshold of stroboscopic is U-shaped, and the most obvious illuminance range of stroboscopic effect is between 10 and 1001ux, while for outdoor AC LED lighting, it increases with illumination in a certain range. The stroboscopic threshold is becoming smaller and smaller until it remains constant. Secondly, the visible threshold model of stroboscopic is verified by using the complex waveform superimposed by sinusoidal waves with different frequencies. The results show that the threshold model is robust to the prediction of stroboscopic visibility. Finally, the effect of AC LED illumination with different modulation depth on stroboscopic acceptability is studied by comparing with DC LED lighting. The results show that modulation depth has a significant effect on the acceptability of stroboscopic. With the increase of modulation depth, the boredom of "flicker" and "moving artifacts" produced by AC LED increases. The acceptable threshold of stroboscopic effect is 75% modulation depth and the visible threshold value of stroboscopic effect is 17.4 for square wave AC LED illumination with 50% duty cycle of 100Hz frequency. It can be seen that the stroboscopic acceptable threshold is much larger than the stroboscopic visible threshold.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM923.34

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