本論文旨在研究高功因單相及三相交流/直流轉換器，提出新型單相及三相功因校正交流/直流降-升壓型轉換器。此新型單相及三相交流/直流降-升壓型轉換器，操作在不連續導通模式，使用一簡單的波寬調變技術來完成較佳的電力品質，包含單位功因、正弦波形之輸入電流及低總諧波失真之輸入電流。在新型單相交流/直流降-升壓型轉換器方面，相對於傳統的單相交流/直流降-升壓型轉換器，可操作於較大範圍責任週期。因此可適用於普用型輸入電壓(85 – 265 V)及寬廣的負載範圍。應用此新型單相交流/直流降-升壓型轉換器串級一直流/直流降壓型轉換器作單級化單相交流/直流轉換器設計。應用於普用型輸入電壓、直流低壓輸出及寬廣的負載範圍。且基於實用原則，直流鏈結電壓必須小於450 V，由實驗結果知其直流鏈結電壓小於210 V，達到要求。在新型三相交流/直流降-升壓型轉換器方面，於每一切換週期對輸出電容器及負載提供固定的平均電流，因此其直流輸出電壓漣波的六倍電源頻率成分可被消除，僅受單一切換週期影響，所以可採用小容量的輸出電容器。應用此新型三相交流/直流降-升壓型轉換器串級一直流/直流順向型轉換器作單級化三相交流/直流轉換器設計，使用於直流低壓輸出。因直流鏈結電壓漣波僅受單一切換週期影響，所以可採用小容量的直流鏈結電容器。且後半級在重載時操作在連續導通模式，輕載時操作在不連續導通模式，使直流鏈結電壓小於280 V，達到實用原則。在論文內對於電壓增益及邊界操作狀態之穩態分析與電感器、電容器及輸入濾波器之設計均有詳細的討論，並完成硬體電路來驗證理論及可行性。

The novel single-phase and three-phase power-factor-correction (PFC) AC/DC buck-boost converters are proposed in this dissertation. The novel PFC converters are operated in discontinuous conduction mode (DCM) by using a simple pulse-width modulation (PWM) control strategy to achieve good power quality, including almost unity power factor, purely sinusoidal input current and low total harmonic distortion of input current (THDi). For the novel single-phase PFC AC/DC buck-boost converter, this converter can be operated with larger duty-ratio range than the conventional single-phase PFC AC/DC buck-boost converter. Therefore, this converter can be applied for universal input voltage (85 – 265 V) and wide output-power range. Moreover, a single-stage single-phase AC/DC converter, which integrates the novel single-phase AC/DC buck-boost converter with a DC/DC buck converter, is presented. This converter can be used for universal input voltage, low DC output voltage and wide output-power range. Based on practical applications, the intermediate DC-link voltage must be less than 450 V. From the experimental results, one can see that the intermediate DC-link voltage is below 210 V. For the novel three-phase PFC AC/DC buck-boost converter, this converter provides a constant average current to the output capacitor and load in each switching period. So the DC output-voltage ripple is affected by only one switching period. The ripple component of six-order line frequency can be eliminated. Therefore, a smaller output capacitor can be used to replace the bulky capacitor. Also, a single-stage three-phase AC/DC converter, which integrates the novel three-phase PFC AC/DC buck-boost converter with a DC/DC forward converter, is proposed for low DC output-voltage applications. Since the ripple component of the intermediate DC-link voltage is affected by only one switching period, a smaller DC-link capacitor can be used. Based on practical applications, the rear semi-stage is operated in continuous conduction mode (CCM) at heavy loads, and is operated in DCM at light loads. From the experimental results, one can see that the intermediate DC-link voltage can be controlled within 280 V. Finally, the steady-state analysis of voltage gain, boundary operating condition, as well as the selection of inductor, output capacitor and input filter are presented. Also, hardware circuits with simple control logic are implemented to illustrate the theoretical analysis and feasibility.

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