臺灣博碩士論文加值系統

傳統順向式轉換器常使用於500W以內的直直流電力轉換，提供弱電系統穩定的電源，當轉換器效率不佳時，會增加內部損耗功率，造成不必要的能源浪費。轉換器效率的高低，與同時出現在元件上的電壓、電流有很大的關係，而不必要的功率消耗，與頻率與導通時間有關，適當的改善技術，可以在電壓、電流、頻率與導通時間取得較佳的調協，達到節能與提高效率的效果。
本文透過IsSpice模擬與傳統順向式轉換器的實做成品，分析探討在能量轉換過程中損耗的原因，建立起數學模式，藉由數學模式的分析，解析傳導損失、切換損失與控制電路的消耗，並透過主動箝位、同步整流與脈衝跳躍技術的使用，將傳統順向式轉換器在輸出功率為50W到200W時的平均效率，由原先82.25%提升至90.45%；空載消耗，由原先的3W降至為1W，證明本文所使用的改善技術，可以達到改善效率的效果。

Traditional forward converter is often used in less than 500 watt AC to DC power converting. Provide low voltage system a stable power supply. When the converter efficiency poor will increase the internal power loss, resulting in unnecessary waste of energy. Converter efficiency of the high or low which relating to voltage and current at the same time on the components. And unnecessary power consumption will depend on the frequency and the turn on time. Therefore, the appropriate improvements technology will be able to voltage, current, frequency and turn on time to obtain best solution to achieve energy-saving effect.
This study used IsSpice simulation and the traditional forward converters finished product, to analysis and explore for energy transfer in the course of the power loss of the reasons, and establish a mathematical function. By the analysis of mathematical models to explore conduction loss, switching loss, controller dissipation. Through the active clamp, synchronous rectification, pulse skipping technology to let the converter the average efficiency of the conventer is increased from the original 82.25 percent to 90.45 percent in the output power of 50 W to 200 W. And no load consumption decrease from 3W to 1W. This shows the technology used in this study can achieve the goal of improving.

中文摘要 I
ABSTRACT II
目　錄 IV
圖 目 錄 VI
表 目 錄 IX
符 號 表 X
第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 5
1.3 研究方向 7
1.4 論文架構 8
第二章 順向式轉換器與改善技術 9
2.1 順向式轉換器 9
2.1.1 鐵芯的消磁 10
2.2 改善技術原理 15
2.2.1 共振技術 17
2.2.2 柔性切換技術 21
2.2.3 同步整流技術 24
第三章 傳統順向式轉換器的設計與分析 26
3.1 轉換器的設計 26
3.1.1 基本動作原理 26
3.1.2 元件規格設計 29
3.1.3 IsSpice模擬與成品實作 42
3.2 轉換器的損耗分析 51
3.2.1 傳導損失 52
3.2.2 切換損失 56
3.2.3 控制電路消耗 66
3.2.4 其他損失 69
第四章 傳統順向式轉換器的改善 72
4.1 降低空載消耗 75
4.2 減少能源轉換的損失 78
4.3 效率的提升 90
4.4 改善成果與測試討論 93
第五章 結論與未來展望 113
參考文獻 115

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