A Novel Control Scheme of DCM Boost PFC Converter
A Novel Control Scheme of DCM Boost PFC Converter
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DOI：
10.1109/tpel.2014.2372152
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发表时间：
2015-10
影响因子：
6.7
通讯作者：
K. Yao;Wenbin Hu;Qiang Li;J. Lyu
中科院分区：
文献类型：
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作者：
K. Yao;Wenbin Hu;Qiang Li;J. Lyu
不连续电流模式升压功率因数（PF）校正转换器具有开关的零电流导通、二极管中无反向恢复和恒定频率操作的特点。然而，当占空比在线路周期中恒定时，输入电流包含丰富的三次谐波，其相对于基波分量具有π的相位差。谐波不仅导致PF较低，而且导致主功率元件的峰值和RMS电流值较大，这导致较高的导通和开关关断损耗。本文提出了一种变占空比控制方案，使输入电流中只含有与基波同相的三次谐波，而在一定的输入电压下仍保持与恒占空比控制相同的功率因数。为了简化电路实现, 本文进一步给出一种拟合占空比的方法。效率随着临界电感的增加而提高，并且峰值和RMS电流值因此而降低。所提出的方法还实现了输出电压涟漪或输出存储电容的减小。最后给出了120 W样机的实验结果，验证了所提方法的有效性。
The discontinuous current mode boost power factor (PF) correction converter features a zero-current turn-on for the switch, no reverse recovery in diode, and constant frequency operations. However, when the duty cycle is constant in a line cycle, the input current contains rich third harmonic which has a phase difference of π with respect to the fundamental component. The harmonic results in not only a lower PF but also larger peak and RMS current values of the main power components, which lead to a higher conduction and switching turn-off loss. In this paper, a variable duty cycle control scheme is proposed to make the input current contain only third harmonic which is in phase with fundamental component, while remaining the same PF at a certain input voltage as that of constant duty cycle control. A method of fitting the duty cycle is further proposed for simplifying the circuit implementation. The efficiency is improved as the critical inductance increases and the peak and RMS current values consequently decrease. The proposed method also achieves an output voltage ripple or the output storage capacitance reduction. The experimental results from a prototype of 120 W are given to verify the effectiveness of the proposed method.