臺灣博碩士論文加值系統

近年來，由於綠色能源的概念逐漸被重視，對於電源轉換器轉換效率的改善重點，也逐漸由重負載條件延伸至輕負載條件。在各式以電池作為電力來源的產品中，例如：可攜式產品、電動車以及獨立式太陽能系統等等，通常其待機時間（輕負載操作），皆較使用的時間（重負載操作）為長。因此，輕負載條件時的轉換效率也成為待機時間長短的關鍵。本研究主要針對同步降壓型轉換器在輕負載情況下，對於轉換效率進行改善，並且利用電路模擬與實際電路進行驗證。
此研究適合使用在同步整流的電源電路中，尤其如同可攜式產品等等需長時間在輕負載操作的產品，亦期望此論文能對此有所貢獻。

In recent years, because the green energy concept is taken gradually, the key of power transformation efficiency gradually extends from the heavy to light load condition. In various types by the battery in the product as an electric power source, for example: Portable type product, the electric car as well as detached solar energy system and so on, the standby time (light load operation) is usually longer than use time (heavy load operates). Therefore, creating a high transformation efficiency to extend the standby time becomes a topic for study and discussion. This research mainly aims on the improvement regarding the transfer efficiency in the light load situation of synchronous buck converter, and carries on the verification by using the electric circuit simulation and the actual electric circuit.
This research suits the use in the synchronized rectification power circuit, especially for those portable type products that need to be operated in a long period of time. We expecting this thesis could have any contribution to power electronic.

誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖目錄 vi
表目錄 x
縮寫及符號對照表 xi
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機及目的 3
1.3 論文組織 5
第二章 直流對直流轉換器之架構與調變方式 6
2.1 調變方式之分類 6
2.2 直流-直流轉換器之分類 8
2.3 同步降壓型轉換器 16
2.4 影響效率的主要因素 18
2.5 小結 20
第三章 研究與改良 21
3.1 同步降壓型轉換器的主要損耗 21
3.2 防止逆向電感電流的方式 25
3.3 減低輕負載時的切換損失及驅動損失 35
3.4 小結 38
第四章 設計與實驗結果 39
4.1 前言 39
4.2 主迴路部份 39
4.3 電感逆向電流偵測電路 41
4.4 PWM/PFM模式切換電路 45
4.5 電路全圖 50
4.6 模擬結果 51
4.7 實體路測試結果 64
4.8 小結 73
第五章 結論與未來研究方向 74
參考文獻 75

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