Automatic battery equalizers require no sensing circuits, which reduces their cost, size, and complexity. However, among existing methods, additional resistors or diodes are used in the balancing paths to ensure safe operation, which degrades the conversion efficiency and balancing speed. To overcome this problem, this article proposes an equalizer architecture based on the half-bridge LLC converter. The inherent current limitation characteristic of the proposed equalizer improves the balancing speed. High conversion efficiency is achieved due to the soft-switching operations of the switches. The circuit topology and working modes are presented first, then the features of voltage equalization, inherent current limitation, and soft-switching conditions are analyzed in detail. Finally, the proposed equalizer is validated by simulation and experiment.

中文翻译：

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具有固有电流限制的基于 LLC 的电池均衡器


自动电池均衡器不需要传感电路，从而降低了成本、尺寸和复杂性。然而，现有方法中，在平衡路径中使用额外的电阻器或二极管来确保安全操作，这降低了转换效率和平衡速度。为了克服这个问题，本文提出了一种基于半桥 LLC 转换器的均衡器架构。所提出的均衡器的固有电流限制特性提高了平衡速度。由于开关的软开关操作，实现了高转换效率。首先介绍了电路拓扑和工作模式，然后详细分析了电压均衡、固有电流限制和软开关条件的特点。最后，通过仿真和实验对所提出的均衡器进行了验证。