根據視覺反應探討LED照明的省電驅動技術

A Study on Driving Technology of LED Lighting for Saving Energy Based on Visual Test Result

紀宣如(Shuan-Ju Chi)

指導教授 ： 黃秉鈞

國立臺灣大學/工學院/機械工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.01581

摘要

本研究旨在設計一個視覺實驗，由人眼視覺反應來探討LED照明的省電驅動技術，以提升LED照明的能源效率。本研究採用定電流PWM驅動技術，以方波和梯形波進行視覺實驗測試，探討在不同頻率，不同背景色條件下的省電趨勢。再透過統計方式-「卡方分佈」來分析實驗結果，以判定省電與否。
本研究實地設計一個符合國際照明委員會標準的CIE視覺實驗箱，以CIE 在1964年制定的視角視野10°為本實驗觀測視野大小進行測試。研究結果顯示，PWM頻率的改變不會影響測試者對亮度的視覺判斷，但背景色的改變會影響測試者的判斷；背景為白屏（反射產生光源色）時，測試者被騙機率較高，約可省10％的電；背景為有色面（物體色）時，會因有色面樣本的不同而有不同的實驗結果，但大致約可省5％∼10％的電。

關鍵字

視覺 ； 馬赫帶 ； 省電

並列摘要

The main purpose of this study is to test whether we can improve the efficiency of LED by using PWM driven circuits. The human eye instead of optic instruments is the detector for judging the illumination intensity in a visual test box. Constant-current PWM driving technique is used in this study to generate square-wave and trapezoidal-wave currents. The potential of energy saving under light of different wave forms or pulse frequencies, or different background colors are evaluated. The experiment results are analyzed with chi-square test to determine the significance of energy saving.
A visual test box is built according to the CIE (Comission International del’Eclairage) standard. 10° visual angle is established as the appropriate size for the field of view by CIE in 1964. The results show that PWM frequencies have no effect on the observers’ judgments. However, the background colors can influence how the observers judge the illumination intensity. When the background color is the light-source color, it is easier to trick the observer into believe that the luminance of 90% duty cycle is the same as 100% duty cycle. This will save about 10% of energy. When the background color is the color of the materials, the results differ with different materials, and will save about 5-10% electric energy.

並列關鍵字

PWM ； LED

參考文獻

[1] http://www.elcfed.org/

[2] J.R.Brodric,“DOE Solid State Lighting Status and Overview,”2nd annual DOE Solid-State Lighting Workshop, San Diego,Feb.3-4, 2005

[3] The promise of solid state lighting for general illumination, U.S. Department of Energy & Optoelectronics Industry Development Association, 2002

[Website:http://www.oida.org]

[4] 技術資料表DS45，“高功率光源 Luxeon ΙΙΙ Emitter”，Lumileds Lighting，2005.4