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On/Off Control of Boost PFC Converters to Improve Light-Load Efficiency in Paralleled Power Supply Units for Servers

机译:升压PFC转换器的开/关控制,以提高服务器并联电源单元的轻载效率

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摘要

This paper proposes an on/off control of boost power factor correction (PFC) converters to improve the light-load efficiency in paralleled power supply units (PSUs) for servers. The proposed scheme operates the PFC stages of two paralleled PSUs alternately during one cycle of a 60-Hz ac input only at light loads. This improves the light-load efficiency without deteriorating the heavy-load efficiency by reducing load-independent losses such as capacitive turn-on and core losses. In addition, the proposed scheme alleviates the harmonic distortion by reducing the discontinuous conduction mode region. Experimental results from 1.6-kW PFC boost converters are shown to verify the proposed work.
机译:本文提出了一种升压功率因数校正(PFC)转换器的开/关控制,以提高服务器并联电源单元(PSU)的轻载效率。所提出的方案仅在轻负载下在60 Hz交流输入的一个周期内交替操作两个并行PSU的PFC级。通过减少与负载无关的损耗(例如电容性导通和铁芯损耗),这可以提高轻载效率,而不会降低重载效率。另外,所提出的方案通过减小不连续传导模式区域来减轻谐波失真。显示了1.6 kW PFC升压转换器的实验结果,以验证所提议的工作。

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