本論文主要研製一外接式AC/DC電源轉接器(Adaptor)。所研製的adaptor由昇壓型主動式功率因數修正器(Power Factor Correction, PFC)與具有同步整流LLC串聯諧振轉換器(Series Resonant Converter, SRC)組成。PFC電路可以提昇功率因數到90%以上，有效減少輸入電流的諧波。LLC串聯諧振轉換器運用零電壓切換(ZeroVoltage Switching, ZVS)的特性，因此具有高效率的特點。此外研製的adaptor也具有輕、薄、低耗能、高效率，價格競爭性等優點。
本論文詳細分析、討論了電路工作原理、設計考量。所研製的120W實驗原型機經測試後驗證了線路的可行性。全電壓輸入的範圍是90~264VAC，雙組輸出電壓，一組+19VDC額定輸出功率110W，另外一組輸出電壓為+5VDC，額定輸出功率10W，電路板(PCB)的面積只有154mm長、60mm寬，零件高度限定為15mm。此電源轉換器的結構於輸入端是一組可濾除電磁干擾 (Electro-Magnetic Interference, EMI )的濾波器(Filter)，加入輸出過電壓、過電流、短路與本體過溫度等保護電路提昇所研製的adaptor的可靠性。經過實驗測試驗証所研製的adaptor平均效率於額定輸入電壓115VAC時達89.2%。

The thesis aims to study and implement an external AC to DC adaptor. The studied adaptor consists of a boost power factor corrector (PFC) and a LLC series resonant converter with synchronous rectification. The PFC circuit raises the input power factor to 90% and eliminates the input current harmonics. The LLC series resonant converter presents high efficiency performance due to zero-voltage switching feature. The studied adaptor has many advantages such as low profile, low powerconsumption, high efficiency, and cost competitiveness.
The operating principles and design considerations of the studied adaptor are analyzed and discussed in details. A 120W laboratory prototype is built and tested to verify the feasibility of the proposed scheme. The prototype can be operated under universal input voltage range from 90 to 264VAC and provides two sets of outputs: +19VDC/ 110W and +5V/10W. The size is only 154mm(length)´ 58mm(width)´ 15mm. An EMI Filter is also added in front of the adaptor to reduce the conducted EMI emission. Some protection functions such as over-voltage-protection (OVP), over-current-protection (OCP), short-circuit-protection, and over-temperature-protection (OTP) are realized to raise the reliability of the studied adaptor. According to the experimental verifications, the average efficiency of the studied adaptor is 89.2% at rated input 115VAC.

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