摘要
本文旨在利用發光二極體（LED）所開發之散熱模型，由於考慮到LED燈在使用上要降低散熱之熱阻(R total)才能使整個系統的設計上達到有效的散熱效果，吾人利用系統識別的方法求出系統的轉移函數Gpb(s)，並推導出4×4矩陣，且求出方程式之七個未知數，此轉移函數共有4階極點3階零點的次數考量，進而模擬出LED晶蕊、金屬電路板和各接點的溫度(Tj、Tc、Tb、Tl)及熱阻，並藉各個溫度可控制chip在安全溫度下操作，模擬驗證其誤差值都在1%以內，最大誤差溫度為1.7℃，相對誤差溫度為0.01℃，誤差百分比為0.62%，之後依照求出的安全溫度，本文LED元件亦含有一散熱鰭片的散熱系統，金屬電路板下裝上散熱鰭片後，測量最低散熱鰭片熱阻與實體散熱的最低總熱阻，內熱阻，外熱阻，使得整個系統的總熱阻若已達ㄧ般高瓦特數燈具良好表現，因模擬出的Tb溫度分布在45℃~76℃之間，與實驗值誤差在0.8%以內，進而模擬出Tj曲線分布在62.5℃~94.3℃之間達到95℃以下，代表本文的散熱模擬之銅片、散熱鰭片的連結能讓此燈具達到良好的散熱效果。
並列摘要
This thesis maimly aim at developing the medical diagnosis lamp with LED, In consideration to the lighting in the use of heat that will reduce the thermal resistance to the design of the whole system to achieve effective heat dissipation, we use the system identification to find the transfer function for simulating the safe operating temperature when developing,the transfer function have a total of the number 4-order pole and 3- order zeros that are considering, then simulating the LED crystal core, metal, circuit boards ,the junction temperature and the thermal resistance,temperature can be controlled by each chip operating at safe temperatures.The simulate error is within 1%,the Max. temperature is 1.7℃,the relative error temperature is 0.01℃, relative error percent is 0.62%,after the security temperature will be obtained in accordance.The Tb simulated temperature distribution at between 45 ℃ ~ 76 ℃, and the experimental error of less than 0.8%, and then simulate the distribution curve of Tj Between 62.5 ℃ ~ 94.3 ℃ to 100 ℃, it indicated this analog of copper cooling, heat sink and fan links will make this lamp to achieve a good cooling effect.