本論文研製一非對稱半橋順向諧振式轉換器，是以混合式切換技術搭配非對稱半橋順向式轉換器，來提高轉換器零電壓切換之範圍，且輸出二極體也具有零電流切換的優點。半橋式轉換器變壓器的磁滯迴路可操作在第一與第三象限，所以能對磁性元件有較充分的利用。而非對稱半橋電路的優勢在於架構簡單、低開關耐壓與零電壓切換的特性，適合用在低功率的電源供應系統。本論文為一非對稱半橋順向諧振式轉換器，但沒有輸出電感，二次側則利用同步整流的功率開關來取代蕭特基二極體，以減少損耗、提升效率。
本文分析非對稱半橋順向諧振式轉換器之動作原理，配合SIMPLIS電路模擬軟體的輔助設計，實際完成一適用於電壓轉接器的電路，其輸入電壓Vacin 90~264 V、輸出為19 V/65 W的轉換器。

This thesis proposes an asymmetrical half-bridge forward resonant converter, which applies the so-called of a “hybrid-switching” technique on the converter to increase the range of zero-voltage-switching (ZVS), and the zero-current-switching (ZCS) on output diode. The magnetic hysteresis loop of a half-bridge converter can transverse over both the first and the third quadrants; therefore the magnetic components can be fully utilized. An asymmetrical half-bridge converter has the following advantages: simple structure, lower switch voltage rating, ZVS features and therefore suitable for low power applications. This thesis presents an asymmetrical half-bridge forward resonant converter without output inductor. The secondary-side Schottky diode is replaced by a synchronous rectification power MOSFETs to reduce the conduction loss and improve the power efficiency.
The operating principle of the proposed converter has been analyzed, described and discussed in detail. The simulations using SIMPLIS are performed and used for circuit design. A wide input range 90 ~264 Vacin and an output of 19 V/65 W converter is implemented to verify the proposed converter scheme, which applies adapter.

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