本論文主要研製一台180W/19V薄型化雙變壓器外接式電源供應器。首先利用MATHCAD模擬軟體，針對品質因數(Q)、K因子及特性阻抗(Zo)進行討論，並分析與探討其轉移函數曲線。
電路架構由兩級電路所組成，前級穩壓電路使用邊界模式功率因數修正器，以提高功率因數與降低電流諧波，而後級DC-DC轉換器架構則為LLC半橋式串聯諧振轉換器，配合零電壓切換減少一次側切換損耗與同步整流技術減少二次側導通損。採用雙變壓器之優點為變壓器可均分輸出負載電流，分散變壓器體積，並易於實現電源供應器高功率密度之要求。藉由設定諧振頻率及特性阻抗，可計算出各元件之値。最後實作一台輸出規格為19 V/9.47 A之雙變壓器外接式電源供應器，除了將實測結果和理論值相互印證之外，並研擬未來研究方向。

This thesis focuses on the study and implementation of a 180-W/19-V low-profile dual-transformer external power supply. First the MATHCAD simulation software is used to discuss the quality factor (Q), K factor and characteristic impedance (Zo). Also the transfer function of the voltage gain is derived and analyzed.
The presented converter consists of two power stages. A boundary conduction mode (BCM) power factor corrector (PFC) is used as the pre-regulator for raising efficiency and improving the input power factor (PF). A half-bridge series resonant converter (SRC) of LLC type with secondary synchronous rectification (SR) is adopted as the DC-DC conversion stage. Switching losses on the primary switches and conduction losses on the secondary rectifiers can be significantly reduced. The advantages of the two-transformer topology are the inherent load current sharing, reduced transformer sizes, and feasibility for high power density requirement. From the specified resonant frequency and characteristic impedance, the circuit components can be calculated. Finally, a two-transformer LLC-type SRC with an output voltage of 19 V and an output current of 9.47 A is realized. Theoretical analyses are verified with the experimental results. Also future works for this research are included.

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