可攜式電源供應器之散熱系統設計

Thermal module design in the portable AC/ DC adapter

林聖傑(Sheng-Chieh Lin)

指導教授 ： 林震

國立臺北科技大學/機電學院/機電整合研究所/碩士(2005年)

https://doi.org/10.6841/NTUT.2005.00016

摘要

本研究的目的在建立與分析可攜式電源供應器散熱模組的設計，電源供應器主要功能是將交流電源轉換成為直流電源；首先針對目前用於筆記型電腦的電源供應器來探討，目前筆記型電腦之電源供應器普遍為可攜式之封閉電力系統，故無法使用強制冷卻的方式來降低內部高溫元件的溫度，如何設計電源供應器內部的散熱模組，可將熱均勻的傳導到內部的每個地方，再藉由塑膠外殼來散熱，更顯的重要；同時在設計時需要遵循各國安規及相關的法條規定，對於內部電子元件的最高溫度上皆有明確的規定。依照所選用的材料及相關法規的限制，將模型建立起來，我們選用一個輸出功率為120瓦特的電源供應器為分析的模組，使用有限元素法[1~5]對散熱模組來進行分析，再以田口法[6] [7]的實驗方式來找出參數的最佳組合。藉著有限元素的分析與實際模組的結果來比對誤差，希望能藉此分析在將來能節省在可攜式電源系統中散熱模組在設計的時間及有效的節省設計上的成本。
再以電腦軟體分析的結果與實際模組所量測得到的結果相互比對，彼此間的誤差值約為5~7%，此誤差產生的原因該是未將較小的電子元件發熱的情形列入考量，故會有此誤差產生，但依照模擬所得的結果當作在設計時的參考依據確定是可行的。也希望在將來能藉著模擬的結果在設計新的電源供應器時，能夠達到省錢省時的功效。

關鍵字

散熱模組 ； 電源供應器 ； 有限元素法 ； 田口法

並列摘要

There are many papers about the thermal module for server and desktop PC power supply. But there is no paper about the thermal module of the AC/DC adapter which is brick type. When we design the AC/DC adapter, we also use the method of try and error. The purposes of this research are to set-up and analyze the thermal module in the portable AC/DC adapter. The function of the AC/DC adapter is transferring the AC power source to the DC power source. First of all, we study the power adapter used in the notebook. The AC/DC adapter for the notebook is the portable and closed-end power system, so we can’t force to cold down the temperature of the inner components. Therefore, how to design the thermal modules that conduct the heat more uniformly and make the temperature down becomes more important. When we design the adapter, we must follow the safety and related rules to set-up the thermal module. In this research, we choose a 120watt power using the Finite Element Method to analyze the thermal distribution and finding out the best size of heat-sinks by Taguchi method. Hope we can reduce time and cost by the difference between the result of finite element method and experiment when we design the thermal module of AC/DC adapter.
Now compare the simulation data from computer with the measured data, there are 5% tolerance. Because we don’t consider that the SMD and other electronic components are the heat sources, so there still has error. It is possible that we can refer to the simulation result when we design the thermal module. By this way, we hope can save the time and money when we get new adapter in the future.

並列關鍵字

Thermal module ； AC/DC adapter ； Finite Element Method ； Taguchi Method

參考文獻

[1] O. C. Zienkiewicz, 1971, The Finite Element Method in Engineering Science, McGraw Hill.

[2] A. J. Baker, and D. W. Pepper, 1991, Finite Element 1-2-3, McGraw Hill.

[3] J. N. Reddy, An Introduction to the Finite Element Method, McGraw Hill

[4] A. J. Baker, 1985, Finite Element Computational Fluid Mechanics, McGraw Hill.

[5] E. L. Wilson and R. E. Nickell, 1960, “Application of the Finite Element Method to Heat Conduction Analysis”, Journal for Nuclear Engineering and Design, Vol. 4.pp. 276-286.