臺灣博碩士論文加值系統

本篇論文主要是研製一高效率之電源供應器。此電源供應器之結構包含電磁干擾濾波器，可以有效減少系統端雜訊所導致的電磁干擾問題。使用準諧振返馳式轉換電路，並搭配同步整流技術，使二次側功率損耗明顯降低，提高整體轉換效率，並針對不同負載下效率提升方法說明。
最後，本論文以輸入交流90 V~132 V、輸出直流電壓5V、輸出功率12 W等為所提之高效率低待機損耗之電源供應器規格，實際完成並測試驗證效率大於90 %，確實可符合現今所有能源法規及能源之星規範的要求。

The purpose of the thesis is to develop a slim type power supply with high efficiency. The power supply is constructed with an electromagnetic interference (EMI) filter which can efficiently reduce EMI issues caused by the system. The thesis adopts a quasi-resonant flyback converter circuit and operates with a synchronous rectification technique. As a result, the power consumption on the secondary circuit has been significantly reduced and the efficiency of power supply can be raised. Describe efficiency raise under difference load.
In conclusion, the thesis implements a slim type power supply with high efficient which specifications include input voltage range of 90~132 Vac and output of 5 Vdc / 12 W. The practice power supply is implemented to test and verify the compliance the efficiency greater than 90% with the EPA requirements and Energy Star regulations.

摘　要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
表 目 錄 vi
圖 目 錄 vii
符 號 表 x
第一章 緒論 1
1.1 研究背景與動機 1
1.2 研究目的 2
1.3 章節概述 4
第二章 準諧振返馳式轉換器介紹與分析 5
2.1 準諧振返馳式轉換器操作模式 5
2.1.1 連續導通模式 6
2.1.2 不連續導通模式 7
2.1.3 硬性切換 11
2.1.4 柔性切換 11
2.2 準諧振返馳式轉換器動作原理 12
第三章 同步整流電路介紹與分析 20
3.1 同步整流電路簡介 20
3.2 同步整流電路之工作原理 20
第四章 電路設計與功能描述 24
4.1 準諧振返馳式轉換器的設計 24
4.2 變壓器的設計 25
4.3 一次側功率開關的設計 26
4.4 同步整流功率開關的設計 27
4.5 輸出電容的設計 27
4.6 大電容的設計 28
4.7 準諧振返馳式轉換器控制IC 29
4.8 同步整流電路控制IC 32
4.9 控制器的設計 34
第五章 實測結果 36
5.1 準諧振返馳式轉換器之實測波形 37
5.2 準諧振返馳式轉換器之實測效率 50
第六章 結論與未來展望 51
6.1 結論 51
6.2 未來研究方向 51
參考文獻 53

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