博碩士論文 etd-0820108-120551 詳細資訊

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姓名

紀曉樺(Hsiao-Hua Chi)

電子郵件信箱

chispot@giga.net.tw

畢業系所

資訊電機工程碩士在職專班(Extension Education Master Program of Information & Electrical Engineering)

畢業學位

碩士(Master)

畢業時期

96學年第2學期

論文名稱(中)

低待機功率損耗與高效率的同步整流電力轉換器之研究

論文名稱(英)

Synchronous Rectification Power Converter with Low Standby Power Loss and High Efficiency

檔案

etd-0820108-120551.pdf

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論文使用權限

二年後公開

論文語文/頁數

中文/101

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本頁面已被瀏覽 1240 次

摘要(中)

本論文主要研究一具有低待機功率損耗的高效率同步電源轉換器，於待機模式時能符合綠色能源規範且重負載模式下仍能保持高效率之直流／直流轉換器。
本文之電源轉換器以返馳式轉換器為主體架構，返馳式轉換器架構一直是一百瓦以下轉換器的首選，它的價格低廉，架構簡單，且不需要二次側輸出電感，在成本與體積上具有相對優勢。在重負載狀態下，以同步整流技術取代一般傳統之二極體整流方式，主要利用功率場效電晶體極低的導通阻抗特性取代二極體的順向壓降，改善二次側整流損失，已大幅的提高效率。當輸出負載達設定之待機條件時，利用本文提出之新型電流偵測電路－感應式電流偵測器，關閉二次側同步整流驅動電路，以降低待機損耗。
本論文主要貢獻是對電源製造廠未來產品須符合歐盟及能源之星要求具有參考價值，內容詳述轉換器電路原理及測試波形，測試結果證實此電路確能達到低待機損耗及高轉換效率特性，並能符合歐盟執委會與能源之星之規範。

摘要(英)

This thesis investigates the DC/DC converter with low stand-by power consumption and high transfer efficiency.
Flyback converter topology has been the first choice for conversion below 100W in modern industry. It great attraction is that it has low cost and simple framework and no output inductor require. The consequent savings in cost and volume is a significant advantage. In heavy load status, the low conducting resistance of MOSFET is used to substitute for the forward voltage drop of output schottky diode to reduce the conduction loss and increase transfer efficiency. When the output is closed to stand-by condition, use the novel current sensing circuit – induction current sensor to close the secondary synchronous rectification driver circuit and reduce the stand-by loss.
The contribution of this thesis is to provide a solution of future products for power manufactory to meet European Commission and EPA standard. This thesis studies the operational principle of the Flyback converter and analyzes the test waveform. Finally, the test result is presented to demonstrate that the circuit has the benefits of low stand-by loss and high transfer efficiency, and all the experimental measurement can meet European Commission and EPA standard.

關鍵字(中)

電流偵測

電源轉換器

返馳式轉換器

同步整流

關鍵字(英)

Synchronous Rectification

Flyback Converter

Current Sensing

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
縮寫及符號對照表 x
第一章緒論 1
1.1 研究背景 1
1.2 研究動機與目的 3
1.3 論文組織 4
第二章返馳式轉換器介紹與分析 6
2.1 返馳式轉換器簡介 6
2.2 返馳式轉換器之工作原理分析 7
2.2.1 連續電流模式CCM之穩態分析 13
2.2.2 臨界電流模式BCM之穩態分析 20
2.2.3 不連續電流模式DCM之穩態分析 24
第三章低待機損耗高效率同步返馳式轉換器設計分析 31
3.1 高效率同步返馳式轉換器原理分析 32
3.1.1 同步整流技術之必要性與損耗分析 32
3.1.2 同步整流技術之驅動方式 36
3.2 返馳式轉換器之兩種同步整流電路狀態 40
3.2.1 連續導通模式CCM 40
3.2.2 不連續導通模式DCM 43
3.3 降低待機損耗電路介紹分析 44
3.3.1 綠色能源 44
3.3.2 交換式電源轉換器空載損耗來源 48
3.3.3 傳統電流偵測電路介紹 49
3.3.4 新型電流偵測電路介紹分析 55
第四章實驗波形與測試結果分析 63
4.1 轉換器主要波形量測 63
4.1.1 轉換器主要規格 63
4.1.2二極體整流方式之轉換器波形量測 64
4.1.3同步整流方式之轉換器波形量測 67
4.2 效率與待機損耗改善分析 75
4.2.1 三種架構之效率與待機損耗比較分析 75
4.2.2 各種電流偵測電路之比較分析 81
第五章結論與未來展望 84
5.1 結論 84
5.2 未來展望 85
參考文獻 86

參考文獻

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口試委員

謝新銘 - 委員

何子儀 - 委員

黃思倫 - 指導教授

口試日期

2008-07-17

繳交日期

2008-08-20

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