| Summary: | 碩士 === 國立中央大學 === 電機工程研究所碩士在職專班 === 99 === This thesis designs an electro-optic system based on light emitting diode (LED) bulbs. If also designs isolated-type LED bulb drive circuits with high power factor.
Additionally, software simulations are performed first to determine the number of LEDS of a bulb. Such that the LED bulb could meet the desired lumen value. LEDS are driven by constant current control. The drive method provides constant brightness and longer life time. Moreover, optical software Trace Pro is used to simulate optical characteristics of optical source so that the lumen value and illumination intensify of LED bulb could be obtained.
Through single stage fly-back structure and current feedback from the primary side, the drive circuit could be dramatically simplified. In this case, the overall every conversion efficiency is increased. The highest conversion efficiency is 88%. In addition, the power factor reaches 0.97 due to the power factor correction.
Finally, and integration sphere system is used to measure LED bulb parameters like lumen, colors coordinate, light spectrum, etc. An 7w LED bulb is realized. Experimental results show that the LED bulb has 639 lumen and high conversion efficiency 89 lumen/W. These data also show that the designed LED bulb could be used to replace the traditional 60W bulb with 610 lumen and conversion efficiency 10.172 lumen/W.
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