臺灣博碩士論文加值系統

本文發展一具單位功因之交流-直流轉換器，其由兩個疊接功因修正器、一個前向電能轉換器及一個降壓式電能轉換器組合而成，兩個功因修正器中的一個功因修正電路操作在高頻脈波寬度調變切換，另一個功因修正電路則操作在與輸入交流電壓同頻率切換，兩個功因修正電路疊接操作可在輸入端產生五階之交流電壓，因此可降低輸入濾波器之容量，且與傳統功因修正電路作比較，本文所提之交流-直流轉換器中由於每一個功因修正電路之輸出電壓減半，因此高頻切換操作之功因修正電路之切換電壓亦減半，可有效降低高頻切換操作之功因修正電路之切換損失及交流-直流轉換器之電磁干擾，且藉由控制高頻切換操作之功因修正電路可使輸入電流為一與交流電源電壓同相位之弦波，以達到單位輸入功因。降壓式電能轉換器與前向式電能轉換器則將兩個功因修正器之電壓整合成單一個輸出電壓供應負載，本文並將以數位信號處理器晶片為控制核心，發展具單位功因之交流-直流轉換器雛型，以測試並驗證其功能。

In this paper, an AC-DC power converter with unity power factor is proposed. The proposed AC-DC power converter is configured by two cascade–connected power factor correctors, a buck power converter and a forward power converter. One of power factor correctors is switched in high-frequency pulse-width modulation, and the other one is switched in the frequency the that of input AC voltage. Accordingly, the cascade operation of two power factor correctors can generate a five-level AC voltage in the input terminal so as to reduce the capacity of input filter. As compared with the conventional power factor corrector, the output voltage of power factor corrector in the proposed AC-DC converter is reduced by half. Thus, the switching voltage of high-frequency power factor corrector is also reduced by half. Hence, the switching power loss of high-frequency power factor corrector is reduced and the electromagnetic interference of AC-DC power converter is alleviated. In addition, the input current of AC-DC power converter will be controlled by the high-frequency power factor corrector to be a sinusoidal waveform in phase with the input AC voltage so as to attain unity power factor. The buck power converter and the forward power converter are applied to integrate the output voltages of power factor correctors to an output voltage supplying to the load. A prototype with a digital signal processor based controller is developed and tested to verify the performance of the proposed AC-DC power converter.

目錄
摘要……………………………………………………………………………I
Abstract……………………………………………………………II
誌謝…………………………………………………………………………………IV
目錄…………………………………………………………………………………V
圖目錄……………………………………………………………………………VIII
表目錄……………………………………………………………………………XII
符號說明………………………………………………………………………XIII

第一章緒論……………………………………………………………1
1-1前言…………………………………………………………………1
1-2研究動機與目標……………………………………………1
1-3論文架構…………………………………………………………3

第二章交流-直流電能轉換器………………………………4
2-1二極體整流器……………………………………………………4
2-2功因修正器電路………………………………………………7
2-3單相全橋式電力轉換器…………………………………10
2-3-1雙極性切換…………………………………………………11
2-3-2單極性切換…………………………………………………12
2-4五階式電能轉換器…………………………………………14
2-4-1五階飛輪電容式電能轉換器…………………15
2-4-2五階全橋疊接式電能轉換器…………………16
2-4-3二極體箝位式電能轉換器………………………16
2-4-4模擬結果………………………………………………………17
 
第三章具單位功因之交流-直流轉換器……………20
3-1單位功因之交流-直流轉換器………………………20
3-2新式疊接式功因修正器…………………………………21
3-2-1操作原理………………………………………………………22
3-2-2新式疊接式功因修正器之控制方塊………29
3-3降壓式轉換器……………………………………………………31
3-3-1降壓式轉換器之操作…………………………………31
3-3-2降壓式轉換器之控制方塊…………………………33
3-4前向式轉換器……………………………………………………33
3-4-1前向式轉換器之控制方塊…………………………35

第四章硬體雛型…………………………………………………………37
4-1週邊硬體電路………………………………………………………37
4-1-1市電電壓感測電路…………………………………………38
4-1-2電流感測電路…………………………………………………39
4-1-3直流電壓感測電路…………………………………………39
4-1-4光耦合驅動電路………………………………………………40
4-2數位控制器……………………………………………………………41
4-2-1控制器主程式流程…………………………………………41
4-2-2新式疊接式功因修正器控制程式流程………42
4-2-3降壓式轉換器控制程式流程…………………………44
4-2-4前向式轉換器控制程式流程…………………………45

第五章實驗結果與討論…………………………………………………46
5-1具單位功因之交流-直流轉換器之元件規格……47
5-2具單位功因之交流-直流轉換器實測結果…………48
 
第六章結論與未來研究方向…………………………………………56
6-1總結………………………………………………………………………………56
6-2未來研究方向……………………………………………………………57
參考文獻………………………………………………………………………………58

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