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研究生:李嘉偉
研究生(外文):LEE, JIA-WEI
論文名稱:設計實現雙向電壓模式控制轉換器改善雙組輸出返馳式之交叉調整率與功率分配
論文名稱(外文):Design and Implementation of a Bidirectional Voltage-Mode Controlled Converter for Improving Cross-Regulation and Power Distribution in Dual-Output Flyback Converters
指導教授:劉邦榮
指導教授(外文):LIU, PANG-JUNG
口試委員:賴炎生歐勝源謝耀慶
口試委員(外文):LAI, YEN-SHINOU, SHENG-YUANHSIEH, YAO-CHING
口試日期:2019-07-23
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電機工程系
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:2019
畢業學年度:107
語文別:中文
論文頁數:139
中文關鍵詞:交叉調整率雙向直流-直流轉換器雙組輸出返馳式轉換器功率分配控制器設計數位訊號處理器小訊號模型零電流偵測過電流保護
外文關鍵詞:Cross regulationBidirectional DC-DC converterDual-ouput flyback convertersPower distributionController designDigital signal processorSmall-signal modelZero current detectorOvercurrent protection
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許多電子產品需要多組電壓,如電視、顯示器、工業型電源等。基於考量產品體積、效率與成本因素,其中一種流行的架構是使用一個變壓器與多次級側繞組來產生多組直流電壓,但此作法有嚴重的交叉調整率問題。本文提出加入一組額外雙向電壓模式轉換器,來調節主轉換器的雙組輸出電壓與功率分配。因此主轉換器可產生準確的雙輸出電源,且此雙電源可同時支援9V各3A或者5V各3A。此方式不但可以減輕高負載路徑之功率元件應力,亦可減少低負載輸出之電壓飄高問題。此外,即使未受控制的繞組在高負載電流的情況下,該輸出電壓仍受到良好地控制。即使負載電流於0~100%的變化中,所提之控制方法均可適當分配功率於主轉換器的兩組輸出繞組。此外,藉由加入電流偵測電路,可以消除雙向轉換器於低輸出電流時之反方向電流現象,以提升雙向轉換器之能量傳遞效率。實驗結果證明,當雙輸出之負載電流不平衡時,輸出電壓飄高現象可從90%的輸出額定電壓值改善至3%的輸出額定電壓值。當未受回授控制的輸出電壓在重載的情況下,該輸出電壓可從不到一半的額定輸出電壓改善至-3%的額定輸出電壓。此外,藉由雙向轉換器的能量回收機制,當返馳式轉換器的輸出功率27W時,整體效率提升6.35%,而在轉換器輸出功率54W時,效率提升17.08%。
Multi-output power supplies are required in various electronic devices such as TV, monitor and industrial power supply. By considering volume, efficiency, and cost, one of popular structures uses only one transformer and multiple secondary windings to generate multiple dc outputs. However, this method suffers the issue of serious cross regulation. This thesis proposes to add an additional bidirectional voltage-mode controlled converter to regulate output voltage and power distribution of the main converter. Consequently, the main converter can generate accurate dual output powers, and two outputs can simultaneously support 3A on 9V or 5V. This method not only reduces the current stress of power devices on heavy-load path, but also decreases the rising voltage issue of light-load output. In addition, even though the uncontrolled winding is under heavy load, the output voltage of the uncontrolled winding is still well regulated. Besides, by adding a current detector, the reverse current of the bidirectional converter can be eliminated under light loads to improve energy transfer efficiency of the bidirectional converter. The experimental results verify that the issue of rising voltage is improved from 90% to 3% of the rated output voltage when load currents of two outputs are unbalance. When the output voltage of the uncontrolled winding operates under heavy load, the output voltage of the uncontrolled winding is improved from less than half of the rated output voltage to -3% of the rated output voltage value. Moreover, by energy recycle scheme of the bidirectional converter, when the output power of the flyback converter is 27W, the overall efficiency is increased by 6.35%. The overall efficiency is increased by 17.08% when the output power of the flyback converter is 54W.
摘 要 i
ABSTRACT iii
誌 謝 v
目 錄 vi
表目錄 viii
圖目錄 ix
第一章 緒 論 1
1.1 研究背景與動機 1
1.2 論文概述 7
第二章 返馳式轉換器交叉調整率文獻探討 9
2.1 返馳式轉換器基本架構 9
2.2 交叉調整率 15
第三章 交流-直流雙組輸出電壓轉換器 22
3.1 雙組輸出電壓架構文獻探討 22
3.2 所提出之雙向轉換器控制雙組輸出電壓方法 31
第四章 系統設計 32
4.1 系統架構 32
4.2返馳式轉換器設計 33
4.2.1 電路硬體設計與分析 33
4.2.2 補償器設計 51
4.3 雙向電壓模式轉換器設計 58
4.3.1 模式選擇器 58
4.3.1.1 降壓模式控制策略 59
4.3.1.2 升壓模式控制策略 60
4.3.2.3 流程圖 61
4.3.2 電路硬體設計與分析 63
4.3.3 補償器設計 68
4.4 TYPE-C PD切換輸出電壓開關 77
4.5 子電路設計 80
4.5.1 類比保護電路 80
4.5.1.1 電流感測 80
4.5.1.2 零電流偵測電路 82
4.5.1.3 過電流保護 84
4.5.2 數位低通濾波器 88
4.5.3 低通濾波器Butterworth Filter 90
4.5.4 光隔離驅動 91
4.6 系統佈局 92
第五章 模擬結果 95
5.1 雙組輸出返馳式轉換器 96
5.2 返馳式轉換器加雙向轉換器 104
第六章 實驗結果與探討 114
6.1 雙組輸出返馳式轉換器 115
6.2 返馳式轉換器加雙向轉換器 119
6.3 效率 129
6.3.1 雙組輸出返馳式轉換器 129
6.3.2 雙向電壓模式轉換器 130
6.3.3 系統整體效率比較 131
6.4 輸出開關模擬TYPE-C PD電壓切換 132
第七章 結論與未來展望 133
參考文獻 135
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