- 期刊
發光二極體接面溫度的自動量測系統
An Automatic Measurement System for Junction Temperatures of Light-Emitting Diodes
摘要
近年來，高功率發光二極體的應用領域不斷地增加，除了交通號誌及戶外看板外，高功率發光二極體也逐漸在背光模組及固態照明等應用中佔有一席之地。 高功率發光二極體需要大電流驅動，使用時會產生大量的熱，進而影響發光二極體的性能，例如發光效率及可靠度，因此，高功率發光二極體需要的高性能的散熱機制。 為有效評估高功率發光二極體的散熱機制，需要精確量測高功率發光二極體的接面溫度。我們使用順向電壓法量測發光二極體的接面溫度，並開發完成高功率發光二極體的自動化接面 溫度量測系統。 本文說明如何設計電路並使用LabVIEW程式語言，透過資料擷取卡，建立高功率發光二極體的自動化接面溫度量測系統。最後，我們以Cree公司的2W EZ1000共金發光二極體，示範自動量測系統的操作結果。
並列摘要
In recent years applications of high-power light-emitting diodes (LEDs) have constantly increased. For example, usage of high-power LEDs has increased in traffic signs and outdoor-boards, as well as in backlighting systems and solid-state illumination. High-power LEDs requiring high current drives generate much heat, which in turn degrades the performance of a device with regard to illumination efficiency and reliability. Thus, a reliable heat management scheme is required in the application of these LEDs. To evaluate a heat-management system, a precise measurement system for the junction temperatures of LEDs is highly desirable. In this study, the forward-voltage method was applied to measure such temperatures and an automatic measurement system developed. This report describes the design of the circuit and the use of the LabVIEW programming language through a data-acquisition card to create the measurement system. Finally, the measurements obtained from a 2W EZ1000 eutectic LED (Cree Corporation) by using the automatic system are demonstrated.