本論文主要提出一非線性轉換比無橋交流開關功率因數修正器之新型架構，在無橋交流開關功率因數修正器架構上增加一組交流開關來改變電感儲能的方式，進而改變輸入電流的上升斜率，以減少輸入電流在零交越點的失真。在寬範圍輸入電壓下，相較於無橋交流開關功率因數修正器均能有較高的功率因數值及較低的總諧波失真。由於本論文電路架構的改變，使得電路的轉移函數不同於傳統升壓型轉換器，因而具備高升壓比之特性。
最後分別設計並實現輸出功率800 W、輸出電壓400 V之非線性轉換比無橋交流開關功率因數修正器，以及同規格之無橋交流開關功率因數修正器予以比較，並透過模擬軟體Simplis及數學軟體Mathcad進行電路模擬及損耗分析，加以驗證電路的正確性與可行性。在輸入115 Vac及230 Vac，中載至滿載條件下，其非線性轉換比無橋交流開關功率因數修正器的功因值高於0.97，電流總諧波失真低於20 %。

This thesis presents a novel bridgeless AC-switch power factor corrector (PFC) with nonlinear conversion ratio topology. Add a set of AC-switch on the bridgeless AC-switch PFC topology to change the way that inductor stored energy, thereby changing the rising slope of the input current, then the input current at the zero crossing can chase better. In the case of universal input, this topology can obtain high power factor (PF) and low total harmonic distortion (THD). In this thesis, due to change the structure of the circuit, making the transfer function of the circuit is different from the conventional boost converter, which has the characteristic of a high step-up ratio.
Finally, a 800-W nonlinear conversion ratio bridgeless AC-switch PFC and 400-V output voltage is designed and implemented. Also a 800-W bridgeless AC-switch PFC is built for comparison, through simulation and loss analysis to verify the correctness and feasibility of the circuit. In the input 115 Vac and 230 Vac, half load to full load conditions, the nonlinear conversion ratio bridgeless AC-switch PFC circuit PF is above 0.97 and THD less than 20 %.

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