應用LED晶片溫度自動量測系統分析LED燈具效能

近年來發光二極體(Lighting Emitting Diode, LED)的發光效率與光通量的不斷提升，逐漸成為許多產品光源的替代方案，在此情況下，LED散熱模組之散熱效能將更為重要。本論文為探討LED散熱模組之散熱效能分析，利用LED的端電壓與溫度之關係，建立高功率LED晶片溫度自動量測系統，針對市售之LED燈具進行散熱效能之檢測，並針對LED頭燈散熱模組進行設計與研究，提出自然對流與強迫對流之兩種方案散熱設計，並利用嵌入式系統晶片設計LED頭燈溫控系統，針對傳統強迫對流方式加以改善，最後探討傳統鹵素燈光源與高功率LED之耗能分析與CO2排碳量之多寡。由結果顯示，本論文應用LabVIEW軟體設計之晶片溫度量測系統可準確量測市售LED燈具之LED晶片溫度，並配合散熱鰭片之溫度，評估其LED燈具之散熱模組效能，其LED車頭燈散熱模組經由實驗結果顯示，不論在自然對流與強迫對流下，其晶片溫度均可控制90℃以下，已達到高壽命與高發光效率之要求，利用溫控系統比傳統強迫對流方式可在減少風扇能源消耗約50%。分析LED耗能，以汽機車車頭燈為例，其分析結果顯示在自然對流或強迫對流情況下，本論文提出之高功率LED車頭燈比傳統鹵素車頭燈光源可減少汽油的消耗，並減少二氧化碳排放量，已達到節能減碳之目的。

關鍵字

LED燈具； LED晶片溫度；散熱模組

並列摘要

The luminous efficacy and luminous flux of LEDs have continued to increase and gradually become an alternative light source for many products in recent years. In this case, the heat-dissipation efficiency of LED thermal modules will be even more important. To explore the heat-dissipation efficiency of LED thermal modules, the paper applies the voltage and temperature relationship of LEDs and establishes a high-efficiency LED automatic chip temperature measurement system to process heat-dissipation efficiency tests on commercial LED lighting, and process design and research focusing on the LED headlight thermal module. Two heat-dissipation designs—free convection and forced convection—are proposed, and the embedded systems on the chip are used to design the LED headlight smart temperature control system and improve the traditional forced convection method. Finally, the energy consumption analysis and CO2 carbon emissions of traditional halogen light sources and high-efficiency LEDs are explored. The result shows that the chip temperature measurement system designed by the paper using LabVIEW software can accurately measure the LED chip temperature of commercial LED lighting, and evaluate the thermal module efficacy of the LED lighting by coping with the heat sink. The experimental result of the LED headlight thermal module shows that the chip temperature can be controlled at under 90℃ for both free convection and forced convection. It has reached the requirement of long life and high luminous efficacy. Using a temperature control system can also reduce 50% of the fan energy consumption of traditional forced convection. The headlights of cars and motorcycles are used as an example to analyze LED energy consumption, and the analysis result shows that in the condition of free convection or forced convection, the high-efficiency LED headlight proposed by the paper can reduce more gasoline consumption and carbon dioxide emissions than traditional halogen headlights, and thus achieve the purpose of energy saving and carbon reduction.

並列關鍵字

LED lighting ； LED Junction Temperature ； thermal modules

參考文獻

[1] 鄭景太，”高功率LED 熱管理技術與量測”，工業材料雜誌256期，P180~189，2008。

Google Scholar

[2] Sheng-Liang Kuo, Chun-Kai Liu, Ming-Ji Dai, Chih-Kuang Yu, Heng-Chieh Chien and Chung-Yen Hsu ,”Characteristics of Thermal Resistance for High Power LEDs,” Electronics Packaging Technology Conference, pp149-154, 2008.