| Summary: | 碩士 === 國立中正大學 === 光機電整合工程研究所 === 102 === Light emitting diode (LED) is a solid state semiconductor luminescence device and demonstrates a number of benefits compared to traditional incandescent lamps. With further improvement LEDs have a great potential to become the next generation of general illumination source. Unfortunately, the thermal problem caused by the LED itself is still a bottleneck to limit the stability, reliability and lifetime of LED. In traditional, the technologies of solving the heat-dissipation problem for LED, including: heat sink, heat pipe, loop heat pipe, adding isothermal vapor chamber, and adhering cooling chip, etc. In the public application, all of these methods are exhausting the waste heat into the environment and cause the more serious greenhouse effect. However, the thermoelectric generator can directly convert the electricity to thermal energy for cooling or transform the waste heat into electric power. Hence, the thermoelectric generator is increasingly seen as having the potential to make important contributions to solve the thermal problem. Based on the statement mentioned in the above, the thermoelectric generator is the core of thermoelectric transformation in this study, which utilizes the temperature difference between the hot end and cold end to generate the available power energy. First, the LED heat energy absorbed by the heat-absorption layer and then conducted by the heat-conduction materials will reach the hot side of thermoelectric chip. In the cold side of thermoelectric chip, the different heat-dissipation materials will be effectively designed to act the heat-dissipation role and ensure the temperature difference between the hot side and cold side is large enough. Finally, the LED thermoelectric module is completed. The experimental evidence indicates that the thermoelectric generator indeed acts the kernel technology for waste heat transformed into renewable electricity. Through integrating the thermoelectric generator with heat-absorption material, heat-conduction material, and heat-dissipation material, it not only could lead high brightness 10W LED light bulb to reach the lowest LED junction temperature (71℃), but also produce the renewable electricity (104.44mW) by transforming the waste heat from high brightness LED.
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