New Bridgeless Buck PFC Converter with Improved Input Current and Power Factor
New Bridgeless Buck PFC Converter with Improved Input Current and Power Factor
复制标题
提高输入电流和功率因数的新型无桥Buck PFC变流器
DOI：
10.1109/tie.2018.2801782
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发表时间：
2018-02
影响因子：
7.7
通讯作者：
Xiang Lin;Faqiang Wang
中科院分区：
文献类型：
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作者：
Xiang Lin;Faqiang Wang
无桥降压型功率因数校正（PFC）变换器具有输出电压低、效率高等优点，但其固有的输入电流死角会使输入电流谐波和功率因数恶化。为了减小死区，本文提出了一种新的无桥降压PFC变换器。通过将主降压电路和辅助反激电路集成在一个磁芯上，消除了无桥降压PFC变换器输入电流中的死角，改善了功率因数和输入电流谐波。所提出的无桥降压PFC变换器设计为工作在断续导通模式（DCM），具有控制器简单和电流整形能力强的优点。提出了一种新的逻辑控制电路。详细的理论推导和设计考虑。实验比较了无桥降压PFC变换器、传统降压PFC变换器和传统无桥降压PFC变换器的性能，验证了新变换器的有效性。
The bridgeless buck power factor correction (PFC) converters feature the merits of low output voltage and high efficiency while their inherent dead angles in the input current will deteriorate the input current harmonics and power factor (PF). Aiming to reduce the dead angles, a new bridgeless buck PFC converter is proposed in this paper. Through integrating the main buck circuit and the auxiliary flyback circuit with one magnetic core, the dead angles in the input current of the proposed bridgeless buck PFC converter is eliminated so that the PF and input current harmonics are improved. The proposed bridgeless buck PFC converter is designed to operate in discontinuous conduction mode (DCM) with the merits of simple controller and nature current shaping ability. A new logic control circuit is provided. The detailed theoretical derivations and design consideration are presented. The experimental comparison among the proposed bridgeless buck PFC converter, the conventional buck PFC converter, and the conventional bridgeless buck PFC converter is displayed to validate the effectiveness of the new converter.