本文提出新型空滯區間調變技術並應用於同步整流返馳式轉換器之效率提升，新型同步整流的控制技術適用於返馳式轉換器之輸出上，因為以MOSFET取代輸出整流器的二極體，且MOSFET具有較低導通損失，可以大幅提升整體電路效率，但在不同負載條件時之效率，電感電流會產生負電流與延遲開關造成損失增加。因此本文提出ㄧ種新型同步整流，此新型同步整流之快速關閉控制方法，利用二次側〖SR〗_sense偵測電壓使開關導通，預測二次側V_gs開關時間，使開關電壓進行下降，可讓開關快速關閉，確保ㄧ次側與二次側開關分開切換，避免開關同時打開之交越問題。本研究具有簡單的控制方式、低成本、高效率和體積小等優點，以新型空滯區間調變控制方法，分析及比較同步整流及蕭特基二極體的效率差異，藉以闡述新型空滯區間調變控制對於效率的提升成效。最後實作二次側空滯區間調變對具同步整流之返馳式轉換器，其交流輸入電壓範圍115V_ac至230V_ac，分別測量二次側開關是否有使用同步整流之技術，與傳統返馳式、ㄧ般同步整流與新型同步整流進行三組效率比較，使用ㄧ般同步整流技術之效率平均約87.4%，而使用新型同步整流控制的效率平均提升約3.75%及2.22%，平均效率為91.2% 。

A new hysteresis interval modulation technology is proposed in this thesis and applied to the efficiency improvement of synchronous rectification flyback converters. New synchronous rectification control technology is suitable for the output of flyback converter. Because the diode of the output rectifier is replaced by a MOSFET and the MOSFET has a lower conduction loss, it can greatly improve the overall circuit efficiency. However, the efficiency is under different load conditions. The inductor current will produce negative current and delay switching causes increased losses. Therefore, a new type of synchronous rectification is proposed in this thesis. This new fast shutdown control method in synchronous rectification uses 〖SR〗_sense in secondary side to detect voltage and make the switch conductive, and then predicts V_gs switching time in secondary side. Because the switch voltage drop, the switch can be closed quickly. It makes sure that the switches in primary and secondary side are switched separately to avoid the problem of crossover when the switches are opened at the same time. This study has the advantages of simple control method, low cost, high efficiency and small size. The efficiency difference between synchronous rectification and Schottky diodes with a new hysteresis modulation control method is analyzed and compared. In this way, the efficiency improvement effect of the new hysteresis interval modulation control is elaborated. Finally, a flyback converter with synchronous rectification and secondary side hysteresis interval modulation is implemented. Its AC input voltage range is 115V_ac to 230V_ac. Whether the switch in secondary side uses synchronous rectification technology is measured separately. Three sets of efficiency are compared with traditional flyback, general synchronous rectification and new synchronous rectification. The average efficiency of using general synchronous rectification technology is about 87.4%. The efficiency of the new synchronous rectification control is increased by about 3.75% and 2.22% on average, and the average efficiency is 91.2%.

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