The capacitor–inductor–inductor–capacitor ( CLLC ) converter is a promising topology for bidirectional power conversion applications, such as hydrogen or battery energy storage systems and bidirectional pulsing current charging or heating for electric vehicle (EV) batteries. For these applications, high dynamic constant current control is required. In this article, a novel constant current control method with improved dynamic performance over the conventional proportional–integral (PI) method is proposed for the CLLC converter. In constant current control, the charging and discharging process of the output capacitor determines the dynamic performance. A state trajectory model is proposed for the CLLC converter and is employed to analyze the transient process in the resonant tank. Based on the analysis, a novel dead-band-based control method for the constant current control is proposed. The proposed method can directly and effectively control the charging and the discharging process of the output capacitor, which the conventional PI control method cannot do. As a result, the dynamic performance is improved. The correctness of the proposed state trajectory model, the state trajectory analysis, and the effectiveness of the proposed constant current control method are verified by experiments. Experimental results show that the response time of the proposed method is reduced by more than 50% compared with that of the conventional PI method, with no overshoot.

中文翻译：

---

一种改善 CLLC 转换器动态性能的恒流控制方法

电容-电感-电感-电容（ CLLC ) 转换器是双向功率转换应用的一种很有前途的拓扑结构，例如氢或电池储能系统以及电动汽车 (EV) 电池的双向脉冲电流充电或加热。对于这些应用，需要高动态恒流控制。在本文中，提出了一种动态性能优于传统比例积分 (PI) 方法的新型恒流控制方法。CLLC 转换器。在恒流控制中，输出电容的充放电过程决定了动态性能。提出了一种状态轨迹模型CLLC 转换器，用于分析谐振回路中的瞬态过程。在此分析的基础上，提出了一种新的基于死区的恒流控制控制方法。所提出的方法可以直接有效地控制输出电容器的充电和放电过程，这是常规PI控制方法无法做到的。结果，改进了动态性能。通过实验验证了所提出的状态轨迹模型的正确性、状态轨迹分析以及所提出的恒流控制方法的有效性。实验结果表明，该方法的响应时间比传统的PI方法缩短了50%以上，且没有超调。