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研究生:林敬穎
研究生(外文):C.I.Lin
論文名稱:應用描述函數法估計轉換器連續導通模式與不連續導通模式
論文名稱(外文):Application of Describing Function to Estimate the Continuous and Discontinuous Conduction Mode for Converter
指導教授:鍾俊業
指導教授(外文):S.C.Chung
學位類別:碩士
校院名稱:逢甲大學
系所名稱:自動控制工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:54
中文關鍵詞:轉換器描述函數連續導通模式不連續導通模式
外文關鍵詞:converterDescribing FunctionContinuous Conduction ModeDiscontinuous Conduction Mode
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降壓式轉換器(buck converter)所使用的濾波用之電感器會因為電感器的非線性特性而造成輸出的電壓不穩定,因而降低轉換器的電壓穩定度而使得設備無法正常操作,因此轉換器的電感元件的非線性特性對設備的影響極為重要,是一個重要的研究主題。所以本論文擬利用描述函數來評估降壓式轉換器因電感器的非線性特性對轉換器的穩壓特性之影響。
論文中以雙輸入描述函數法(dual-input describing function method)將非線性的電感線性化,並推導出降壓式轉換器中的非線性電感的數學表示式,同時利用此計算公式計算其非線性的電感值,即可評估轉換器操作在連續導通模式(CCM)與不連續導通模式(DCM)等兩種不同模式的工作範圍,文中並以一個實際的電路來證明本理論的正確性。
For a dc-to-dc buck converter , the performance of the conductor is significantly different for the converter operating on the continuous conduction mode (CCM) or discontinuous conduction mode (DCM). In this paper, we address the operating condition on the CCM and DCM for a saturated inductor. I will show that the inductor plays a essential role for the converter operating on the CCM and DCM. It is known that when the load is large, the inductance for the inductor always changes. This is due to the fact that when the current load is large, the inductance always suffer from saturation or hysteresis. Because the inductance is nonlinear, it is very difficult to estimate the actual value for the nonlinear inductance during large current situations. With the dual-input describing function method, we can linearize the nonlinear inductor and then estimate the inductance during the large current situations. It can be shown that when the inductance of the inductor is saturated, the operating region of discontinuous conduction mode (DCM) of the buck converter will extent drastically, which means the converter will easily operate in the discontinuous conduction mode. A experimental example will verified these results.
目錄
中文摘要………………………………………………………………………i
Abstract………………………………………………………………………ii
目錄………………………………………………………………………… iii
圖目錄…………………………………………………………………………iv
符號說明…………………………………………………………………….vii
第一章簡介………………………………………………………………….…1
第二章雙輸入描述函數法之等效電感…………………………………….…3
2.1雙輸入描述函數法簡介…………………………………………………3
2.2 電感器的電感……………………………………………………….…7
2.3 理想飽和電感的等效電感量…………………………………………10
2.4 雙斜率飽和電感的等效電感量……………………………………..14
第三章電感特性………………………………………………………………19
3.1直流電感…………………………………………………………...…19
3.2交流電感……………………………………………………….....…21
3.3轉換器之濾波電感器的等效電感…………………………………...24
3.4等效電感…………………………………………………………….…26
第四章降壓式轉換器………………………………………………………..28
4.1 降壓式轉換器連續導通模式…………………………………………31
4.2 降壓式轉換器連續導通模式與不連續導通模式之邊界……………35
4.3 降壓式轉換器不連續導通模式………………………………………37
4.4 降壓式轉換器飽合電感器的影響………………………………….41
第五章降壓式轉換器實驗結果…………………………………………...46
第六章 結論………………………………………………………………..52
參考文獻…………………………………………………………………….53
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