本論文主要研製一操作於箝位電流模式之非線性轉換比降壓型功率因數修正器，傳統線性轉換比降壓型功率因數修正器使用箝位電流模式，在寬範圍輸入且kS固定的情況下，無法同時滿足低壓輸入及高壓輸入均有好的功率因數值與總電流諧波失真值。本論文透過電路架構的改變，使其可在寬範圍輸入情況下均能有好的功率因數值與總電流諧波失真值；此外，箝位電流模式控制可使電感電流在一線週期內同時操作在連續導通模式與不連續導通模式，降低功率開關之導通損失。本論文透過模擬軟體Simplis進行電路模擬及損耗分析，最後設計並實現一輸出功率65 W的非線性降壓型功率因數修正器，其輸出規格為48 V/1.36 A，輸入範圍則是90 VAC ~ 264 VAC，切換頻率為65 kHz，滿載效率最高可達91.83%，總諧波失真符合IEC 61000-3-2 Class C規範。

The aim of this thesis is to investigate and implement a nonlinear-gain buck power factor corrector (PFC) with clamping current mode control. The traditional buck PFC with clamping current mode control of fixed kS factor cannot obtain high power factor (PF) and low total harmonic distortion (THD) in the case of universal input. On the other hand, the nonlinear-gain buck PFC presented in this thesis solves this problem by modifying the power-stage circuit. Moreover, the clamping current mode control allows the inductor current to operate under both continuous and discontinuous conduction modes in a line cycle, and thus the switch conduction loss is reduced. The circuit simulations and loss analysis are performed by Simplis. Finally, a 65-W nonlinear-gain buck PFC prototype with an output of 48 V/1.36 A and switching frequency of 65 kHz was built to verify the theoretical analysis. The efficiency of the tested prototype reaches 91.83% at full load. Also the THD of the line current meets the regulations of IEC 61000-3-2 Class C.

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