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Some Design Considerations for Interleaved PFC for Improved Efficiency and EMI

机译：交错式PFC的一些设计注意事项，以提高效率和EMI

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摘要

For high power application the interleaved multichannel PFC is becoming more and more popular. It can effectively reduce the input current ripple due to the ripple cancellation effect. By properly choosing the interleaving channel number and the switching frequency, the EMI filter size and cost can be effectively reduced. In this paper, the multi-channel interleaving impact on both the DM and CM EMI filter design is reviewed. Furthermore, in this paper, the common mode (CM) EMI noise emission model of the multi-channel PFC converter is studied. The balance technique is introduced to reduce CM noise emission for the multi-channel PFC. The proposed topology can effectively reduced CM noise under any phase shift angles and channel numbers. Finally, using phase-shedding to improve the light load efficiency and its impact on the EMI filter design is discussed. To further improve the light load efficiency, constanton time controlled PFC is also introduced.
机译：对于高功率应用，交错多通道PFC变得越来越流行。由于纹波消除作用，可以有效减少输入电流纹波。通过适当地选择交织信道号和所述开关频率，所述EMI滤波器的尺寸和成本可以有效地降低。本文综述了多通道交错对DM和CM EMI滤波器设计的影响。此外，本文还研究了多通道PFC转换器的共模（EMI）EMI辐射模型。引入了平衡技术以减少多通道PFC的CM噪声发射。所提出的拓扑可以在任何相移角和信道数下有效地降低CM噪声。最后，讨论了使用相消技术提高轻负载效率及其对EMI滤波器设计的影响。为了进一步提高轻负载效率，还引入了恒定时间控制的PFC。

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