Automatic current sharing mechanism in the series capacitor buck converter
Automatic current sharing mechanism in the series capacitor buck converter
复制标题
串联电容降压转换器中的自动均流机制
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Khayat
中科院分区：
文献类型：
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作者：
Pradeep S. Shenoy;Orlando Lazaro;Mike Amaro;R. Ramani;W. Wiktor;B. Lynch;J. Khayat
本研究探讨多相串联电容降压转换器均流的机制与有效性。自动均流机制是串联电容降压拓扑所固有的，并且独特地利用其串联电容。与传统的多相降压转换器不同，在没有任何电流检测电路或添加外部控制回路的情况下实现电流共享。自动均流机制的分析解释了其对电感、直流电阻（DCR）和温度变化的鲁棒性。发现不平等的控制开关接通时间对共享精度有可测量的影响。两相、12 V输入、10 A输出硬件原型的结果证明了串联电容降压转换器的简单、高精度均流能力。不等导通时间的实验结果表现出不匹配的平均电流，但稳定的工作与直流偏移。
This study examines the mechanism and effectiveness of current sharing in a multiphase, series capacitor buck converter. The automatic current sharing mechanism is inherent to the series capacitor buck topology and uniquely utilizes its series capacitor. Unlike conventional multiphase buck converters, current sharing is achieved without any current sensing circuits or added external control loops. Analysis of the automatic current sharing mechanism explains its robustness to variations in inductance, dc resistance (DCR), and temperature. Unequal control switch on-times are found to have measurable impact on sharing accuracy. Results from a two-phase, 12 V input, 10 A output hardware prototype demonstrate the simple, highly accurate current sharing capabilities of the series capacitor buck converter. Experimental results for unequal on-times exhibit unmatched average currents but stable operation with a dc offset.