臺灣博碩士論文加值系統

本文對於相移全橋轉換器與兩種倍壓整流器的結合架構進行了探討研究。在一次側開關元件除了擁有較低的電壓與電流應力，並且可實現軟切換的機制，如寬範圍的MOSFET的零電壓啟動與二極體的具有零電流關閉。由於倍壓整流架構沒有輸出電感元件，因此二次側二極體之電壓應力可箝制在輸出電壓的準位。並且在變壓器元件上可採用較小的匝數比，減少變壓器內部雜散元件之影響。此外，相較於傳統相移傳橋轉換器架構，本文探討之電路架構可減少一次側循環電流損失與變壓器之責任週期損失，並且在具有低的輸出電壓漣波。
本論文除了對研製之電路進行動作原理與理論分析，並且也進行實研結果之驗證，研製電路之規格如下:輸入電壓:300-400V;輸出電壓:200V;額定功率:450W;操作頻率:60k Hz。經由實驗結果驗證，均具有與理論分析之結果相符。

A phase-shift full-bridge converter with voltage double rectifier (PSFB-VD) is investigated. In addition to having low voltage and current stresses on the MOSFET switching device, soft switching operations can be achieved on the switching devices, such as zero-voltage switching on MOSFETs and zero-current switching on rectifier diodes. Due to its inductorless output filter, moreover, the voltage stress of rectifier diodes is thus clamped to the output voltage. Employing the voltage doubler rectifier, a smaller transformer turns-ratio can be used. Furthermore, the PSFB-VD converter has wide range ZVS operation, no duty cycle loss, lower circulating loss, and significantly reduced output voltage ripple.
Another voltage doubler type rectifier, a Taiwan Tech voltage doubler rectifier is employed to integrate the phase-shift full-bridge converter (PSFB-TVD) in this thesis. The PSFB-TVD has a built-in second order filter formed by utilizing the leakage inductance and clamping capacitor to perform a voltage ripple cancellation mechanism with small clamping capacitor.
In addition to the descriptions of the operation principle, theoretical analysis, and design considerations, two hardware circuits, the PSFB-VD, the PSFB-TVD, with 300-400-V input and 200 V/450 W output specification are built and tested.

Chapter 1 Introduction
Chapter 2 PSFB with Voltage Doubler(PSFB-VD)
Chapter 3 PSFB with Taiwan Tech voltage doubler(PSFB-TVD)
Chapter 4 Conclusions and Future Research

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