A High-Efficiency Active Battery-Balancing Circuit Using Multiwinding Transformer
A High-Efficiency Active Battery-Balancing Circuit Using Multiwinding Transformer
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DOI：
10.1109/tia.2012.2229455
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发表时间：
2013
影响因子：
4.4
通讯作者：
Siqi Li;C. Mi;Mengyang Zhang
中科院分区：
文献类型：
--
作者：
Siqi Li;C. Mi;Mengyang Zhang
本文提出了一种简单的串联电池组电池平衡电路。该电路由一个低压金属氧化物半导体场效应晶体管（MOSFET）的每个单元和一个对称的多绕组Transformer的一组细胞。所有MOSFET只需要一个控制信号，能量可以直接从较高电压的电池转移到较低电压的电池。通过增加一个小电容，与Transformer的磁化电感形成谐振电路，在一定的工作范围内实现软开关，获得高效率。对电路的平衡功能和软开关条件进行了分析，并通过仿真和实验进行了验证。测试了用于平衡4芯和12芯电池组的电路。实验结果表明了该电路的有效性。电池间的能量传递效率可达93%。该电路可以很容易地扩展到包含多达12个电池单元的电池串，直接适用于电池数量通常小于12个的消费电子应用。包含大量电池单元的电池组，例如用于电动车辆的电池组，可以在组中平衡，例如，在每个包含12个单元的模块中，并且具有一个附加电路以在模块之间平衡。
This paper presents a simple circuit for balancing series-connected battery cells. The circuit is composed of one low-voltage metal-oxide-semiconductor field-effect transistor (MOSFET) for each cell and a symmetrical multiwinding transformer for a group of cells. Only one control signal is needed for all MOSFETs, and energy can be directly transferred from higher voltage cells to lower voltage cells. A small capacitor is added to form a resonant circuit with the transformer magnetizing inductance so that soft switching can be achieved in some operation range to obtain high efficiency. The circuit balance function and soft-switching condition are analyzed and verified by simulation and experiments. A circuit for balancing a 4- and 12-cell battery group is tested. The experimental results showed the effectiveness of the circuit. The energy transfer efficiency between cells can reach up to 93%. The circuit can be easily scaled to battery strings containing up to 12 battery cells, directly applicable to consumer electronics application where the number of cells is typically less than 12. A battery pack containing a large number of battery cells, such as the ones used in electric vehicles, can be balanced in groups, for example, in modules containing 12 cells each and with one additional circuit to balance among the modules.