A Cell-to-Cell Battery Equalizer With Zero-Current Switching and Zero-Voltage Gap Based on Quasi-Resonant LC Converter and Boost Converter
A Cell-to-Cell Battery Equalizer With Zero-Current Switching and Zero-Voltage Gap Based on Quasi-Resonant LC Converter and Boost Converter
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DOI：
10.1109/tpel.2014.2345672
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
Yunlong Shang;Chenghui Zhang;N. Cui;J. Guerrero
中科院分区：
文献类型：
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作者：
Yunlong Shang;Chenghui Zhang;N. Cui;J. Guerrero
在传统的均衡器中，体积庞大和成本高的事实是普遍存在的。特别是，由于高频硬开关和功率器件两端的电压降，单元之间的零开关损耗和零电压间隙（ZVG）难以实现。为了克服这些困难，提出了一种基于准谐振LC变换器（QRLCC）和升压DC-DC变换器（BDDC）的直接电池均衡器。QRLCC用于获得零电流开关，从而降低功率损耗。采用BDDC来增大均衡电压间隙，以获得大的均衡电流和电池之间的零电压矢量。此外，通过控制BDDC的占空比，该拓扑能够根据电压差在线自适应调节均衡电流，有效地防止了均衡器的失稳，缩短了均衡时间。代替用于每个单元的专用均衡器，仅采用一个平衡转换器并由所有单元共享，从而减小了尺寸和实施成本。仿真和实验结果表明，该方案具有良好的平衡性能，能量转换效率高于98%。通过与现有的主动平衡方法进行定量和系统的比较，进一步验证了所提出的均衡器的有效性。
In conventional equalizers, the facts of bulky size and high cost are widespread. Particularly, the zero-switching loss and zero-voltage gap (ZVG) between cells are difficult to implement due to the high-frequency hard switching and the voltage drop across power devices. To overcome these difficulties, a direct cell-to-cell battery equalizer based on quasi-resonant LC converter (QRLCC) and boost dc-dc converter (BDDC) is proposed. The QRLCC is employed to gain zero-current switching, leading to a reduction of power losses. The BDDC is employed to enhance the equalization voltage gap for large balancing current and ZVG between cells. Moreover, through controlling the duty cycle of the BDDC, the topology can online adaptively regulate the equalization current according to the voltage difference, which not only effectively prevents overequalization but also abridges the overall balancing time. Instead of a dedicated equalizer for each cell, only one balancing converter is employed and shared by all cells, reducing the size and implementation cost. Simulation and experimental results show the proposed scheme exhibits outstanding balancing performance, and the energy conversion efficiency is higher than 98%. The validity of the proposed equalizer is further verified by a quantitative and systematic comparison with the existing active balancing methods.