Design of a LED Intelligent Lighting Luminaire with Automatic Color Temperature Control Performance

• Main Authors: Qiao-xia Wu, 吳巧霞
• Other Authors: Horng-Ching Hsiao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/93113257267248398654

碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === The research focused on designing a LED intelligent lighting luminaire, using the monochromatic color temperature LED, 3000 K, 4000 K, 5000 K, and single-chip microcomputer PIC18F4520, which will control the color temperature of the LED light module automatically, followed the sunlight changing. At night, the lighting luminaire will provide low color temperature environment for the best state of the melatonin secreting. The luminous output would dim gradually when one going to bed until lighting off. Before getting up in the morning, the luminous output would increase up gradually and simulate daylight environment by changing the color temperature of the luminaire according to the sunlight in order to maintain the human body to be in the normal and wealthy biological status. The lighting scheme may be applied to the residential lighting luminaire design, especially in the table light luminaire. Compared with the different design of commercial products, the lighting luminaire proposed has advantages of adjusting linearly and automatically in color temperature, control the color temperature according to the time, low cost and so on. It is included, in this design, deducing a light mixing system according to the relation of the color temperature and color coordinate of the LED light sources. The system could ensure the current ratio relationship between two different color temperature illuminants and the color temperature of the mixed light. The design contained two main coding control programs, including clock generating program and PWM waveform output program. The drive circuit mainly consists of voltage reduction circuit and color temperature controlled circuit. Comparing the experimental test result with the theoretical properties of the light’s color temperature, the deviation is within 100 K. The deviation of the color coordinate is within ±0.8 %.