交流LED頻閃效應(yīng)研究
發(fā)布時間：2018-08-30 15:20
【摘要】：隨著固態(tài)照明技術(shù)的飛速發(fā)展,LED光源憑借其節(jié)能環(huán)保、發(fā)光效率高等優(yōu)點在照明領(lǐng)域得到了廣泛的應(yīng)用。傳統(tǒng)LED光源都是直流LED光源,其在市電供電時必須配備AC/DC和恒流源裝置,這不僅增加了光源的成本,還造成了能源浪費,并限制了LED燈具的壽命。交流LED光源由于其可以直接用交流驅(qū)動，憑借成本低、體積小、轉(zhuǎn)換效率高等優(yōu)點逐漸成為照明行業(yè)發(fā)展的新趨勢,但是由于交流LED光源的光強是隨時間變化的,容易引起頻閃現(xiàn)象。頻閃效應(yīng)是評價照明質(zhì)量重要參考要素之一,它不僅影響人們的視覺舒適,而且能夠誘發(fā)偏頭痛等身體方面的疾病。因此,本文重點對交流LED頻閃效應(yīng)現(xiàn)象展開研究。論文以一種驅(qū)動波形可通過編程控制的LED光源作為研究對象,采用主觀心理學(xué)實驗的方法來研究交流LED的頻閃效應(yīng)可見閾值和可接受閩值情況。首先,研究了驅(qū)動波形對頻閃可見閾值的影響,研究結(jié)果表明,同頻率下方波和正弦波頻閃可見閩值存在一個比例關(guān)系；隨著正弦波驅(qū)動的光源頻率增加,頻閃可見閾值增加；光源的照度對頻閃可見閾值有顯著性影響。對于室內(nèi)交流LED照明情況,隨著照度增加,頻閃可見閾值呈現(xiàn)U型趨勢,頻閃效應(yīng)最明顯的照度范圍在10到1001ux之間；對于室外交流LED照明情況,在一定范圍內(nèi)隨著照度增加,頻閃可見閩值越來越小直至不變。其次,論文采用不同頻率正弦波疊加而成的復(fù)雜波形對頻閃可見閩值模型進行了驗證,結(jié)果表明閩值模型對預(yù)測頻閃可見性有著很好的魯棒性。最后,論文通過與直流LED照明情況對比,研究了不同調(diào)制深度的交流LED照明情況對頻閃可接受性的影響。研究結(jié)果表明,調(diào)制深度對頻閃可接受性有顯著性影響,隨著調(diào)制深度增加,被試對交流LED產(chǎn)生的“閃爍”和“運動偽像”現(xiàn)象厭煩程度增加；對于100Hz頻率50%占空比的方波交流LED照明情況,頻閃效應(yīng)的可接受閩值為75%調(diào)制深度,頻閃效應(yīng)的可見閩值為17.4%�？梢钥吹�,頻閃可接受閾值遠大于頻閃可見閾值。
[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.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM923.34
本文編號：2213478
[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.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM923.34
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