功率器件是现代电力电子技术的核心,分析和解决功率器件热可靠性问题是提高功率器件可靠性的重要课题。文中围绕功率器件在高温和温度变化下的可靠性这一主题,提出从仿真分析的角度对功率器件进行热可靠性分析评价,通过综合考虑电应力、热应力对器件电学特性、传热特性的影响,运用傅里叶基方法和Cauer 网络模型建立器件的电热耦合模型,结合失效物理模型对器件进行寿命预测和薄弱环节分析,相比可靠性试验方法具有显著的周期和成本优势。

Power devices are the core of modern power electronics technology. Analyzing and solving the thermal reliability of power devices has been an important issue to improve the reliability of power devices. Focusing on the reliability of power devices under high temperature and temperature variations, a new method to evaluate the thermal reliability of power devices from the perspective of simulation is proposed in this paper. By comprehensively considering the effects of electrical and thermal stress on the electrical and heat transfer characteristics of the device, the electro-thermal coupled model is built based on Fourier-based method and Cauer equivalent RC thermal network. Then the PoF (Physics of Failure) model is used for lifetime prediction and weak link analysis of power devices. Compared with the reliability test method, this method takes great advantages on saving time and money.

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