三单体直接均衡电路及分布参数对其的影响

针对现有的串联储能电源均衡技术存在的速度慢、效率低、均衡模块数量多的问题，提出了一种三单体直接均衡电路,通过相应的开关动作，能实现相邻三单体之间能量由最高单体到最低单体的直接传递。介绍了此电路的工作原理，详细分析了各种分布参数，尤其是漏感在此均衡电路中的作用和对均衡电路性能的影响。仿真和试验结果显示，漏感能显著影响均衡电路工作模态，开关管电压，均衡电流等，需要在均衡电路实际设计时仔细考虑。

Abstract：Non-uniformity of cells’ characteristics of series-connected energy storage cells courses the problem of unbalance charging and discharging, a three cell direct equalization circuit is proposed. Its has reasonable structure topology that can transfer power energy directly from the highest to the lowest through the corresponding switch’s on-off control, whenever what imbalance state among these three cells are. The operation principle of this circuit is introduced, and analyzed carefully distributed parameter, especially leakage inductor’s role and its effect on the equalization circuit. Simulations and experiments show that leakage inductor can affect the operation mode, switch voltage and equalization current, etc and should be consider carefully.
关键词： 三单体直接均衡电路；漏感；工作模态；均衡电流
Key words：Three cell direct equalization circuit; leakage inductor; operation mode; equalization current