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Low-volume PFC rectifier based on non-symmetric multi-level boost converter

机译:基于非对称多电平升压转换器的小体积PFC整流器

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This paper introduces a universal-input digitally-controlled single-phase rectifier with power factor correction (PFC) based on a modified multi level boost converter topology. In comparison with the conventional boost-based systems and other multi-level solutions the new PFC rectifier has significantly smaller inductor and lower switching losses. The improvements are achieved by replacing the output capacitor of the boost converter with a non-symmetric active capacitive divider and by utilizing downstream converter stage for the divider charge balancing. Experimental results obtained from a 400W, 200KHz, universal input voltage (90V–260V) to 400V PFC prototype demonstrate three times smaller inductor current ripple, allowing for the same inductor reduction, and up to 50% reduction in power losses, resulting in 6% efficiency improvement compared to a conventional boost PFC.
机译:本文介绍了一种基于改进的多级升压转换器拓扑结构的带功率因数校正(PFC)的通用输入数字控制单相整流器。与传统的基于升压的系统和其他多级解决方案相比,新型PFC整流器具有明显更小的电感器和更低的开关损耗。通过使用非对称有源电容分压器代替升压转换器的输出电容器,以及通过利用下游转换器级进行分压器电荷平衡,可以实现上述改进。从400W,200KHz,通用输入电压(90V–260V)到400V PFC原型获得的实验结果表明,电感器电流纹波小三倍,从而允许相同的电感器减小,并且功率损耗减少多达50%,从而导致6%与传统的升压PFC相比,效率有所提高。

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