熱電晶片應用於LED散熱之研究

Abstract

摘要 國立臺灣大學機械工程學研究所碩士論文 論文題目：熱電晶片應用於LED散熱之研究 指導教授：陳希立 博士 作 者：洪宇均 中華民國九十六年六月 本研究提出將熱電晶片整合於自然對流鰭片熱沈，應用於LED散熱。本文以理論分析的手法，分析此熱電自然對流散熱模組的熱傳性能。本研究首先建立一適用於此模組的熱阻分析模式，並依各細部熱阻建立其理論方程式。在此，學生將這些理論方程式編寫於EXCEL VBA中，成為一個簡便易用的分析軟體。此熱阻理論分析模式不僅可預測熱電自然對流散熱模組的熱傳性能，亦可以用來進行系統最佳化，以增強此系統的散熱性能。利用此分析軟體，本研究分析一實際案例，找出了使用熱電晶片能有效提升熱傳性能的操作範圍，及各加熱功率下的最佳操作電流。由於熱沈幾何形狀對於此系統的性能有很大的影響，本研究亦分析了各幾何參數對於此散熱模組總熱阻的影響，並找出了此案例最佳化的鰭片間距及基板厚度。

ABSTRACT Investigation of LED Cooling with Thermoelectric Cooler By Yu-Chun Hong MASTER DEGREE OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING NATIONAL TAIWAN UNIVERSITY June 2007 ADVISER: Dr. Sih-Li Chen The present study proposes TEC-natural convection cooling module, which integrates a thermoelectric cooler (TEC) and a flat plate fin heat sink, to apply to LED cooling. This work theoretically investigates the performance of this module. First, we build a thermal resistance model, and then establish the correlation of each detail thermal resistance. These correlations are coded in EXCEL VBA as a tool for analysis. With the tool, a case study is done and the effective operating region, in which adapting TEC is effective to improve the overall performance, is found. The optimum operating current under every heating power is also found with the tool. Because the geometry greatly influences the thermal performance of this module, the presented study does a series of analysis for each geometry parameter. While analyzing the geometry parameters, the optimum pitch of fin and optimum thickness of base plate are obtained.