本論文主要目的係將零電壓準諧振開關(Zero-Voltage-Switching Quasi-Resonant Switch, ZVS QRS)運用在升壓型主動功率因數修正器上，達到開關局部零電壓切換以減少開關切換損失。另外搭配固定截止時間控制法，限制開關最長截止時間，以避免輸入電流失真。
本論文先就理想電路分析來說明所提出之功率因數修正器開關達到零電壓切換之條件以及電路動作，計算開關之損耗。另就實際應用需求推導非理想電路模型，修正開關達到零電壓切換之條件與開關之損耗。最後以數值方法估算輸入電流波形，並探討局部失真角度。
本論文經多次實驗研究，實際製作一250W零電壓切換準諧振升壓型功率因數修正器(Zero-Voltage-Switching Quasi-Resonant Boost-Type Power Factor Corrector, ZVS QR Boost PFC)，以驗證論文中所提之分析與設計考量是否合理。實作電路之控制IC使用意法半導體公司所生產的8腳位L6561，搭配自製外加控制電路，功率級採用升壓型轉換器電路架構。經測量結果證明開關可達到局部零電壓切換減少切換損失，利於電路高頻化操作。

The main purpose of this thesis is the study and implementation of a quasi-resonant (QR) boost-type power factor corrector (PFC) with partially zero-voltage-switching (ZVS) feature to reduce the switching loss. In addition, a fixed-off-time (FOT) control is applied to improve the input current distortion near the zero-crossings of the input AC voltage. First, the ideal circuit model of the proposed ZVS QR PFC is analyzed to identify the ZVS conditions. Also the circuit operations and the loss analysis of the switch are discussed. Secondly, a practical circuit model with non-ideal circuit elements is derived to modify the ZVS conditions and the switch loss analysis. Finally, numerical methods are applied to estimate the input current waveform and to observe the current distortion.
A 250-W prototype of the presented ZVS QR boost PFC is built to verify the circuit analysis and the design considerations. An 8-pin control IC L6561 produced by STMicroelectronics, along with an auxiliary controller composed of discrete elements, is adopted. Experimental results show that partial ZVS of the QR switch is achieved to reduce the switching loss. Therefore, the proposed ZVS QR boost PFC is especially suitable for the high-switching-frequency applications.

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