臺灣博碩士論文加值系統

本研究提出以和差調變技術(Sigma-Delta Modulation)為基礎的D類功率放大器(Class-D Power Amplifier)。和差調變控制器係由一週期性比較積分迴路所構成，主要架構包含積分器、取樣保持電路及比較器等，和差調變器可依參考信號轉換為適當的連續脈波信號，作為驅動開關用。功率放大器的功率級採用半橋架構，藉由上側和下側驅動電路驅動；再經LC濾波器輸出至負載。本研究實際設計製作一部100W功率放大器，輸出頻率範圍為20~20kHz，輸出效率平均87%以上，諧波失真度4%以下。

A Class D power amplifier by sigma-delta modulation (SDM) is proposed. Cycle-by-cycle control loop is adopted in converting the analog signal into a digital one. Except a constant pulse time to detect the sampled input signal level, a duty period is generated by a discharging/charging rate generated in SDM and its length is dependent on the detected input level and is a multiple of the constant sampling pulse time. Signal process and system model for converting the analog signal into digital one through the SDM modulator is explored. A prototype of 100W class D power amplifier is examined for assessing the theoretical investigation and practicality. The power efficiency is over 87%. The total harmonic distortion (THD) measured without EMI filter is less than 4%.

中文摘要..............................................Ι
英文摘要.............................................II
目錄...............................................III
圖表目錄.............................................V
第一章 序論……………………………………………………………1
1.1 研究背景及動機…………………………………………1
1.2 內容大綱…………………………………………………2
第二章 功率放大器的類型………………………………………3
2.1 線性功率放大器…………………………………………3
2.2 數位調變式功率放大器……………………………6
第三章 功率放大器的信號處理策略………………………………10
3.1 脈波寬度調變技術(Pulse-Width Modulation)………10
3.2 和差調變技術(Sigma-Delta Modulation)……………12
第四章 和差調變式D類功率放大器的結構………………………19
4.1 基本結構………………………………………………19
4.2 小信號分析……………………………………………21
4.3 輸出分析……………………………………………27
4.4 功率放大器的效率損失……………………………29
第五章 設計考量…………………………………………………31
5.1 決定設計參數……………………………………………31
5.2 取樣頻率的選擇…………………………………………32
5.3 補償器設計………………………………………………33
5.4 功率晶體和驅動器的選擇………………………………34
5.5 輸出濾波器設計考量……………………………………36
第六章 設計實例…………………………………………………39
6.1 100W規格參數…………………………………………39
6.2 取樣頻率的決定...........................39
6.3補償器的設計................................40
6.4 功率晶體和驅動器的選擇......................44
6.5 輸出濾波器實例…………………………………………45
第七章 系統模擬與實作分析……………………………………46
7.1 模擬參數設定與結果.....................46
7.2 模擬結果分析..........................49
7.3 輸出量測及分析........................53
7.4 輸出結果分析..........................53
第八章 結論與建議……………………………………………55
8.1 結論………….........................55
8.2 未來研究方向建議.....................55
參考文獻......................................56

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