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首页> 外文期刊>Power Electronics, IET >On-line fault detection of aluminium electrolytic capacitors, in step-down DC-DC converters, using input current and output voltage ripple
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On-line fault detection of aluminium electrolytic capacitors, in step-down DC-DC converters, using input current and output voltage ripple

机译：使用输入电流和输出电压纹波，对降压DC-DC转换器中的铝电解电容器进行在线故障检测

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摘要

The aim of this study is to present a simple on-line fault detection technique that is able to prevent structural failures in aluminium electrolytic capacitors used in the output filter of step-down DC-DC converters. The aluminium electrolytic capacitors equivalent circuit consists of an ideal resistance in series with an ideal capacitor and an ideal inductor. The first two elements change with frequency, temperature and aging. Most manufacturers define the end of life limit of these capacitors when their internal resistance (equivalent series resistance (ESR)) doubles or their capacitance (C) reduces by 20%, when compared with the initial values. The proposed on-line fault detection technique is able to estimate the capacitor ESR value during converter operation. For that purpose, a simple relationship between the input current and the output voltage ripple is used. The measurement system is composed of a digital oscilloscope that is connected to a microcomputer with 'Matlab' software. Several simulation and experimental results are presented to validate the proposed fault detection technique.
机译：这项研究的目的是提出一种简单的在线故障检测技术，该技术能够防止降压DC-DC转换器的输出滤波器中使用的铝电解电容器出现结构故障。铝电解电容器的等效电路由与理想电容器和理想电感器串联的理想电阻组成。前两个元素随频率，温度和老化而变化。与初始值相比，当其内部电阻（等效串联电阻（ESR））加倍或电容（C）减小20％时，大多数制造商会定义这些电容器的使用寿命极限。提出的在线故障检测技术能够估算转换器运行期间的电容器ESR值。为此，使用了输入电流和输出电压纹波之间的简单关系。该测量系统由一个数字示波器组成，该示波器与装有“ Matlab”软件的微型计算机相连。提出了一些仿真和实验结果，以验证所提出的故障检测技术。

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  • 来源
    《Power Electronics, IET》 |2012年第3期|p.315-322|共8页
  • 作者

    Amaral A.M.R.; Cardoso A.J.M.;

  • 作者单位

    Polytechnic Institute of Coimbra, ISEC - DEIS, Rua Pedro Nunes - Quinta da Nora, Instituto de Telecomunicacoes, Department of Electrical and Computer Engineering, University of Coimbra-Polo II;

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