臺灣博碩士論文加值系統

本論文發展一個疊接交流－直流電力轉換系統將市電之交流電能轉換成一穩定之直流電能對蓄電池充電，疊接交流－直流電力轉換系統由一疊接式電力轉換器及一三埠式電力轉換器組成，其中疊接式電力轉換器由一全橋式電力轉換器與無橋式功率因數修正器串接而成，全橋式電力轉換器應用脈波寬度調變技術在其交流端產生一三階高頻脈波輸入電壓，而無橋式功率因數修正器產生五階階梯波輸入電壓，再利用不對稱電壓技術，可使疊接交流－直流電力轉換系統在其交流輸入端產生十一階之交流電壓，可大幅降低輸入濾波器容量及電磁干擾，並使輸入電流為與市電電壓同相位之弦波電流，以降低諧波，達成單位輸入功因，且只有低壓之全橋式電力轉換器作高頻切換，可有效降低切換損失。三埠式轉換器利用一降壓式電力轉換器及一選擇開關可依據市電電壓在無橋式功率因數修正器之直流滙流排產生兩個直流電壓，而控制降壓式電力轉換器之直流輸入電壓可使無橋式功率因數修正器之輸入功率相等於市電之輸入功率，使全橋式電力轉換器無實功率之進出，可避免使用一組隔離式直流-直流電力轉換器來處理全橋式電力轉換器之功率，進而簡化疊接交流－直流電力轉換系統之電力電路，此外，降壓式電力轉換器同時具有直流主動濾波器之功能以濾除充電電流之低頻漣波。本論文將完成以數位信號處理器晶片為控制器之硬體雛型，以驗證其功能。

This thesis develops a cascaded AC-DC power conversion interface to convert the AC power from the AC grid into a stable DC power to charge the battery set. The proposed cascaded AC-DC power conversion interface is composed of a cascaded power converter and a dual-input buck converter. The cascaded AC-DC power converter is formed by connecting a full-bridge power converter and a bridgeless rectifier in series. The full-bridge power converter uses pulse-width-modulation (PWM) technology to generate a three-level input pulse voltage, while a bridgeless rectifier generates a five-level step-wave input voltage. Using the asymmetric voltage technology, the cascaded AC-DC power conversion interface can generate an 11-level AC voltage at its AC input terminal and perform unity power factor. Consequently, the input filter and the electromagnetic interference can be greatly reduced. Only the full-bridge power converter is switched in high frequency, which can effectively reduce switching losses. The dual-input buck converter uses a buck power converter and a selection switch set to generate two DC voltages on the DC bus of the bridgeless rectifier according to the AC grid voltage. By controlling the DC input voltage of the buck power converter, the injected power of the bridgeless rectifier can match the input power from the AC grid and no real power is processed by the full-bridge power converter. As a result, an isolated DC-DC power converter is saved to simplify the power circuit. In addition, the buck power converter also has the function of a DC active filter to filter out low-frequency ripples of the charging current. A hardware prototype is completed to verify the performance of proposed cascaded AC-DC power conversion interface.

摘要 I
ABSTRACT II
誌謝 III
圖目錄 VI
表目錄 IX
第一章 緒論 1
1-1 前言 1
1-2 研究目的 2
1-3 論文大綱 4
第二章 全橋疊接式多階轉換器 5
2-1 全橋電力轉換器 5
2-2 對稱全橋疊接式電力轉換器 7
2-2-1全橋疊接式五階電力轉換器 7
2-2-2全橋疊接式七階電力轉換器 9
2-2-3全橋疊接式九階電力轉換器 12
2-2-4全橋疊接式十一階電力轉換器 14
2-3 不對稱全橋疊接式多階轉換器 16
2-3-1不對稱全橋疊接式七階電力轉換器[34] 16
2-3-2不對稱全橋疊接式九階電力轉換器[35] 19
2-4 比較 22
第三章 應用於電池充電器之疊接交流-直流電力轉換系統 23
3-1疊接交流－直流電力轉換系統電路架構 23
3-2三埠式電力轉換器 25
3-2-1 選擇開關組操作模式 25
3-2-2 降壓式直流-直流電力轉換器動作原理 27
3-2-3 低通濾波器 28
3-3疊接式電力轉換器 31
3-4疊接式電力轉換器之穩壓操作 37
3-5控制電路 40
3-5-1降壓式直流-直流電力轉換器控制方塊 40
3-5-2疊接式電力轉換器控制方塊 42
第四章 電路模擬結果 43
4-1 穩態響應模擬結果 44
4-2 暫態響應模擬結果 48
4-3 損耗模擬結果 51
第五章 實驗結果 55
5-1 穩態響應實測結果 58
5-2 暫態響應實測結果 62
5-3 蓄電池混和式定電流/定電壓(CC/CV)充電之實測結果 65
5-4 效率實測結果 66
第六章 結論與未來展望 68
6-1 結論 68
6-2 未來展望 69
參考文獻 70

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