摘要
高效率的电源变换器广泛应用于航空电子系统,电源的故障会导致整个系统的崩溃,严重影响军用飞机的战备完好性目标。电子系统故障预测可以在故障发生前,有效地探测潜在故障,减轻损失。阐述了Buck型开关电源基本工作原理,介绍了其故障模式及物理失效模型,并详细阐述了电解电容器等效电路模型。通过仿真电解电容器的退化过程,得到开关电源的输出响应特性,表明了电解电容器退化对电源特性的影响.通过辨识电解电容器ESR的值,可以有效评估电容的健康状态,实现开关电源的故障预测。
High efficiency power converters are widely used in avionics,yet are prone to vulnerabilities that can damage overall productivity and system readiness objectives.Electronic prognostics offer effective detection of impending failures so mitigating actions can be performed before damage occurs.The basic operating principle of buck switching-mode power converters is expatiated in this paper.The failure mode and physics failure mode are introduced,and the equivalent circuit model for electrolytic capacitor is expatiated in detail.We get the export response characteristic for switching-mode power converters by simulating the degradation process of electrolytic capacitor,which demonstrates the degradation effect on the power characteristic.We can evaluate the health of electrolytic capacitor and realize the failure predication of switching-mode power converters by identifying the equivalent series resistor.
出处
《电子测量技术》
2010年第11期102-104,共3页
Electronic Measurement Technology
关键词
退化
故障预测和健康管理
开关电源
电解电容器
等效串联电阻
degradation
prognostic health management
switching-mode power
converters electrolytic capacitor
equivalent series resistor（ESR）
