This study deals with a new approach for real-time detection of early ageing in DC-link electrolyte capacitors of DC–DC converters. The method is based on the comparison between the slope of the inductor current derived from a reference dynamic model and that of measurement. All of the normal deviations of the system parameters including gradual ageing of the capacitor and impact of the operating temperature are taken into account in the reference model. Since parameters of the reference model are set in accordance with the datasheets of the components, the reference slope represents normal gradual ageing of the capacitor. Therefore, any early ageing emerges in the measured slope. An accelerated ageing test bench was implemented to assess the proposed method, by which early ageing is emulated by experiments. The results confirm the performance of the method for the early ageing detection.

中文翻译：

---

使用动态参考模型在线监测电容器的早期老化

这项研究提出了一种实时检测DC-DC转换器的DC链路电解质电容器中的早期老化的新方法。该方法基于从参考动态模型得出的电感器电流的斜率与测量值之间的比较。在参考模型中考虑了系统参数的所有正常偏差，包括电容器的逐渐老化和工作温度的影响。由于参考模型的参数是根据组件的数据表设置的，因此参考斜率表示电容器的正常逐渐老化。因此，在测得的斜率中会出现任何早期老化。实施加速老化试验台以评估所提出的方法，通过该方法可以通过实验模拟早期老化。