摘要
本論文係以非對稱半橋式DC/DC電力轉換器(簡稱AHB電力轉換器)為基礎，設計出倍流整流(current-doubler rectification)零電壓柔性切換AHB電力轉換器。此電路係將中央抽頭式變壓器之全波整流架構(full-wave rectification)，以適合於高輸出電流應用之倍流整流(current-doubler rectifier)架構取代。此外，吾人應用同步整流技術，降低輸出整流二極體之導通損失，使得轉換器具有高電能轉換效率之性能。
倍流整流架構，係由全波整流架構演化而來，其優點不僅變壓器製作較為方便，且二次側之均方根電流低於全波整流架構。由於均方根電流之平方大小與銅損成正比，故在高輸出電流之情況下，倍流整流架構之銅損低於全波整流架構，由實作結果可知當輸出電流 時轉換效率為 。
此外，為了提升電力轉換器之效率，吾人將變壓器二次側之整流電路，引入同步整流(synchronous rectification: SR)技術，以降低因輸出整流二極體順向壓降所造成的高導通損失，使得轉換器操作於低電壓/高電流輸出時( )仍具有高電能轉換效率 。
針對本論文所提出之倍流整流零電壓柔性切換非對稱半橋式電力轉換器，吾人進行動作原理分析，再以平均化法，推導轉換器之小訊號數學模式。為了達到輸出穩壓之目的，吾人依據數學模式，設計相位領先、落後補償器與次迴路(minor-loop)回授控制器。經由實作結果可知，在負載或線電壓變動下，所設計之控制器具有良好的穩壓效果。

Abstract
In this thesis, based on the asymmetrical half-bridge (AHB) converter, a current-doubler rectifier ZVS AHB DC/DC converter is designed for the application of high current operation. The full-wave rectification with a central-taped transformer is replaced by the current-doubler rectification. Additionally, in order to improve the efficiency of the converter operating in heavy loads, the technique of synchronous rectification is used to reduced the conduction losses of output rectifier. The presented converter possesses the properties of high efficiency.
The current-doubler rectification is envoled from the full-wave rectification. The advantages of this topology are not only easy implementation of the transformer, but also the rms current of secondary wilding of the transformer is much less than that of full-wave rectification topology. It follows from the facts that the magnitude of rms current is proportional to the copper losses. The copper losses of the current-doubler rectification is thereby less than that of the full-wave rectification under high current operation. The efficiency of the converter operating in is 85.5% by the experiment.
Additionally, in order to improve the efficiency of the converter, the technique of synchronous rectification is applied in the output rectifier to reduce the high conduction losses due to the forward-voltage of the output diodes. The converter still has high efficiency when operating in low voltage and high current conditions.
The detailed circuit analysis for the proposed current-doubler rectifier ZVS AHB converter is also presented in this thesis. The small-signal model is then derived by the averaging method. According to the small-signal mathematical model, a phase leading and phase lag compensator and a minor-loop controller are both designed to achieve output voltage regulation. The experimental responses show that the controllers has a good regulation capacity under the variations of load and line voltage.

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