臺灣博碩士論文加值系統

本論文研究具高效率之全橋相移式零電壓切換之電源轉換器，這是具備同步倍流整流架構之全橋相移式零電壓切換轉換器。在相移式PWM調變中，加入變壓器一次側的共振電路，獲得功率開關在零電壓下切換，在高效率工作下得以避免切換損失，提升效率。為能提升本體電路效率，在變壓器的二次側選用電路架構有倍流整流電路、倍頻輸出電流漣波、低輸出電流漣波架構與同步整流分析等電路。本論文探討全橋相移式零電壓轉換器電路架構之工作原理與特性，相移式零電壓切換轉換器架構，討論倍流整流電路架構之全橋相移式轉換器工作原理，並加入同步整流技術，說明同步倍流整流架構驅動原理。
最後進行「全橋相移式零電壓切換轉換器」電路模擬與實作，實作電路的輸入電壓為180~200V，輸出電壓/電流為24V/6A，滿載時量測的效率為87.37%，高效率之全橋相移式轉換器，得以驗證。

A zero-voltage switching DC/DC converter with the high circuit efficiency is presented in this thesis. The structure of a full-bridge converter with the phase-shift PWM is used to achieve the zero-voltage switching in the transformer primary side. The constant frequency PWM with the resonant of the zero-voltage switching provides the high frequency at the high switching frequency. In order to increase the converter efficiency in the transformer secondary side, a current doublers rectifier, low current ripple, and synchronized rectifier circuits are also adopted. The detail circuit operation and mathematical analysis are presented in this thesis. The measured efficiency on the prototype, a DC/DC converter 200V/24V with 6A output current, is higher than 88%.

中文摘要------------------------------------------------------i
英文摘要------------------------------------------------------ii
誌謝---------------------------------------------------------iii
目錄---------------------------------------------------------iv
表目錄-------------------------------------------------------vi
圖目錄-------------------------------------------------------vii
符號說明-----------------------------------------------------xi
第一章 緒論--------------------------------------------------1
1.1 前言----------------------------------------------------1
1.2 研究動機與目的-------------------------------------------3
1.3 論文概要------------------------------------------------6
第二章 全橋相移式零電壓切換轉換器架構分析----------------------7
2.1 傳統硬性切換--------------------------------------------8
2.2 柔性切換-----------------------------------------------10
2.3 全橋相移式轉換器架構-------------------------------------12
2.4 相移控制驅動架構-----------------------------------------16
2.5 二次側整流電路-------------------------------------------17
2.6 電壓回授控制架構-----------------------------------------20
第三章 全橋相移式零電壓切換轉換器的工作原理與分析----------------21
3.1 相移式脈波寬度調變技術------------------------------------21
3.2 全橋相移式零電壓切換轉換器動作時序分析----------------------23
3.3 同步倍流整流電路架構--------------------------------------41
3.4 同步倍流整流電路工作原理與分析-----------------------------45
第四章 轉換器設計分析-----------------------------------------50
4.1 UCC3895相移控制IC及周邊電路介紹---------------------------50
4.1.1 UCC3895相移控制IC-------------------------------------51
4.1.2 震盪頻率設定-------------------------------------------54
4.1.3 死區時間與自適應延遲設定---------------------------------55
4.1.4 電壓回授控制電路----------------------------------------56
4.2 轉換器元件規格選擇----------------------------------------57
4.3 諧振電路-------------------------------------------------59
第五章 電路模擬與轉換器實作量測---------------------------------61
5.1 電路模擬分析與波形----------------------------------------61
5.2 迴授補償設計---------------------------------------------66
5.3 實作電路波形量測------------------------------------------70
5.4 磁性元件磁滯曲線量測---------------------------------------77
5.5 轉換器效率與外觀-------------------------------------------79
第六章 結論與未來研究方向---------------------------------------81
6.1 結論------------------------------------------------------81
6.2 未來研究方向-----------------------------------------------81
參考文獻-------------------------------------------------------82

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