| Summary: | 碩士 === 國立暨南國際大學 === 生物醫學科技研究所 === 94 === As the brightness be elevated and blue light invented, the LEDs are becoming more and more applications. This thesis applies Nichia corporation full color LEDs to accomplish phototherapy system. The type of full color LED integrates with red, green and blue color LEDs. Color mixture can mix white color and modulate other spectrums. Three PMW circuits achieve optical power and spectrum modulation. The temperature of environment increases, the forward voltage of the LED is decreasing. The LED can be acted temperature detection and instead of temperature sensor with the semiconductor characteristics.
In this thesis, we have designed an adjustable optical power and spectrum for 90 LEDs Array. Temperature detection and temperature control PWM sensor used the same LEDs. The wavelengths cover 460 to 636nm. The maximum optical power of single LED is 38mW/cm2 for red, 20mW/cm2 for green and 34mW/cm2 for blue respectively. The range of temperature detection is 10 to 70℃. When temperature is stable, the accuracy error can reduce to within ±1℃.
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