| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === The thesis is devoted to design and achieve an illuminant with desired correlated color temperature (CCT) by mixing up the individual light output from different LED light sources which is red, greed, and blue LEDs (RGB-LEDs) respectively. By adjusting the different weighting of RGB-LEDs, one is able to get an illuminant which will produce a light feeling very similar to nature daylight. The research uses the color-of-gravity law of color mixture to calculate the flux weights of RGB color, then an optical tool software, Trace Pro, was used to design the layout of RGB-LEDs in order to simulate the weighting results. Based on the simulation results, a digital signal processor (DSP) control chip was adopted to modulate the duty cycle of RGB-LEDs′ drivers to get different weights by using PWM modulation techniques. Finally, a promote type illuminant was constructed and measured by a testing equipment, all digital lighting measure system, to certificate the overall quality.
Keywords：Luminous intensity, LED light sources, Color temperature
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