臺灣博碩士論文加值系統

本論文提出可以平均分擔負載電流的交流/直流轉換器，此乃考量適合應用於大電流負載且擁有較佳擴充模組彈性需求的伺服器電腦系統。此電源供應器結構包含前端的電磁干擾濾波器，可有效消除電源供應器系統端雜訊所造成之干擾問題。前級使用主動零電壓功率因數修正器，後級使用全橋相移零電壓切換轉換器，皆運用零電壓切換技術以有效降低切換損失，進而提升全機效率。控制電路包含保護電路及自動主僕式均流控制電路。文中並針對主動零電壓功率因數修正器、全橋相移零電壓轉換器及並聯均流技術的電路架構作原理說明。
最後設計實作出二部1 kW並聯均流伺服器電源供應器，其輸出電壓為24 V，輸出電流為40 A，效率約為82 %以上(在110 V交流輸入)，分流率為�b3 %以內。

This thesis proposes an AC/DC converter with a load-current sharing feature. The studied converter is suitable for server power supplies demanding high output currents and flexible modulization. An EMI filter for suppressing the conducted noise resulting from the developed power supply is included at the front end, which is followed by a zero-voltage-switching (ZVS) active power factor corrector (PFC) and a ZVS phase-shift full-bridge DC/DC converter. The ZVS technique successfully reduces the switching losses and thus increases the overall efficiency. The main control system consists of several protection circuits and an automatic master-slave current-sharing controller. The operating principles for the ZVS PFC, the phase-shift full-bridge converter, and the master-slave current-sharing control are discussed.
Two 1-kW prototype circuits of server power supplies are implemented and parallel operation is tested. The output voltage is 24 V, the output current is 40 A, and the overall efficiency is about 82% at 110V AC mains voltage. The error percentage of the current-sharing is less than �b3 % of the rated output current.

摘　要 i
Abstract ii
誌　謝 iii
目　錄 iv
圖索引 vi
表索引 ix
第一章 緒論 1
1.1 研究動機與目的 1
1.2 內容大綱 3
第二章 並聯轉換器系統簡介 4
2.1 前言 4
2.2 並聯系統簡介 4
2.3 轉換器方塊圖介紹 5
第三章 主動式功率因數修正器之架構與原理 9
3.1 前言 9
3.2 昇壓型功率因數修正器電路架構 11
3.3 零電壓功率因數修正器電路架構與原理 12
3.4 零電壓功率因數修正器控制電路介紹 17
3.4.1 功率因數修正器之控制方式 17
3.4.2 驅動控制電路 21
第四章 全橋相移零電壓轉換器架構與原理 22
4.1 前言 22
4.2 全橋相移零電壓轉換器主架構介紹 22
4.3 全橋相移零電壓轉換器控制電路介紹 24
4.3.1 迴授與驅動控制電路 24
4.3.2 保謢控制電路 25
4.4 主電路轉換區間之動作分析 26
4.5 臨界電流切換與最高頻率切換 35
4.5.1 臨界電流切換 35
4.5.2 高頻切換限制 38
第五章 並聯均流技術與設計 42
5.1 前言 42
5.2 並聯均流技術種類介紹 42
5.3 自動主僕式原理及設計 52
5.3.1 主僕式均流法動作原理 52
5.3.2 自動主僕法均流電路實現與設計 53
第六章 電源轉換模組實例設計與考量 57
6.1 前言 57
6.2 功率因數修正器電路設計考量 57
6.2.1 功率因數修正器電路元件設計考量 57
6.2.2 控制IC UCC3854參數設計 64
6.3 全橋相移轉換器電路設計考量 69
6.3.1 全橋相移轉換器元件設計考量 69
6.3.2 控制IC UC3895參數設計 73
6.4 設計實例 75
6.4.1 零電壓PFC設計實例 76
6.4.2 全橋相移轉換器設計實例 79
第七章 實驗數據與實驗結果 82
7.1 前言 82
7.2 實作量測結果與波形 82
7.3 電路實體照片 92
第八章 結論與未來展望 94
8.1 結論 94
8.2 未來研究方向 94
參考文獻 96

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