臺灣博碩士論文加值系統

本論文提出兩種不同電路架構之三階交錯式PWM零電壓切換電源轉換器，利用開關串聯方式降低開關元件的電壓應力，輸入端串聯電容結合快速回復二極體在變壓器上產生三種電壓準位。電路的主動開關元件皆可達成零電壓切換，降低開關切換損失。主動箝位零電壓切換技術乃利用開關上的介面電容(Coss)與變壓器的漏電感，在開關導通前產生諧振迴路達到零電壓切換，可有效降低開關的切換損失並箝制開關元件上的突波電壓，提高電路轉換效率。電源轉換器採用交錯式設計可由兩個電源轉換模組平均提供輸出負載功率，輸入與輸出端的電流可由兩個電源模組平均提供，降低電路元件的電流應力，減少輸入與輸出端的電流漣波。電源轉換器的變壓器二次側整流電路採用倍流整流架構，可提供負載端穩定且低電流漣波的電源，且變壓器二次側線圈繞組與濾波電感的最大電流僅為輸出電流的一半，可降低變壓器與的製造成本與體積。倍流整流架構可利用兩個輸出電感電流漣波相加後相互抵消的特性，達到低輸出電流漣波的優點，降低輸出濾波電容器的需求。本論文結合交錯式技術、主動箝位技術與三階開關低電壓應力的特點，提出兩種不同主動箝位方式的高效率電源轉換器架構，並分別探討電路架構模式分析、電路穩態分析、設計考量、實驗電路元件設計、實驗波形說明與電腦模擬結果。

This dissertation proposes two kinds of interleaved zero-voltage-switching (ZVS) three-level pulse-width modulation converters with current doubler rectifier. The switches connected in series is adopted to reduce the voltage stress on switches. One fast recovery diode is connected between the middle point of split capacitors and power switch to generate three different voltage levels on the primary side of transformer. All switches can achieve ZVS turn-on at the resonant interval based on the junction capacitance of switches and transformer leakage inductance. Thus the switching losses of power switches can be reduced. The interleaved PWM scheme is used to achieve load current sharing, reduce the ripple current on the input side and regulate the output voltage. The current doubler rectifier is adopted in the secondary side of transformer to reduce the current stress on the transformer secondary winding and achieve the ripple current cancellation on the output capacitor. The advantages of proposed converters are low voltage stresses on switches, low current stresses on switches and diodes and high efficiency. In the dissertation, operation principle, steady state analysis and design consideration of the presented converter are analyzed. Finally, the experimental results are presented to verify the operation principle of the proposed converter.

目 錄
中文摘要………………………………………………………………………………i
英文摘要……………………………………………………………………………ii
誌謝…………………………………………………………………………………iii
目錄…………………………………………………………………………………v
表目錄………………………………………………………………………………vii
圖目錄………………………………………………………………………………viii
符號說明…………………………………………………………………………x
第一章 緒論………………………………………………………………………1
1-1 研究背景與動機………………………………………………………………1
1-2 研究內容簡介…………………………………………………………………2
1-3 論文大綱………………………………………………………………………3
第二章 切換式電源轉換……………………………………………………………4
2-1 前言……………………………………………………………………………4
2-2 隔離式電源轉換器……………………………………………………………4
2-3 主動箝位與倍流整流技術………………………………………………………5
2-4 交錯式技術……………………………………………………………………8
2-5 三階電源轉換器………………………………………………………………9
第三章 三階主動箝位交錯式電源轉換器…………………………………………12
3-1 前言……………………………………………………………………………12
3-2 電路模式分析…………………………………………………………………13
3-3 電路穩態分析………………………………………………………………27
3-4 電路元件參數設計…………………………………………………………29
3-5 實驗電路設計步驟……………………………………………………………33
3-6 實驗結果………………………………………………………………37
第四章 三階交錯式直流/直流電源轉換器…………………………………………58
4-1 前言………………………………………………………………58
4-2 電路模式分析………………………………………………………………59
4-3 電路穩態分析……………………………………………………………………68
4-4 電路元件參數設計…………………………………………………………70
4-5實驗電路設計步驟……………………………………………………………74
4-6實驗結果…………………………………………………………………78
第五章 結論與未來研究方向……………………………………………………99
5-1結論……………………………………………………………………………99
5-2未來研究方向……………………………………………………100
參考文獻……………………………………………………………………………101
作者簡介……………………………………………………………………………107

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