对比多种方法预测MOSFET老化,TFT在长期预测中表现最优。
Comparative analysis and evaluation of ageing forecasting methods for semiconductor devices in online health monitoring
- 采用经典追踪、统计模型与神经网络,引入时序融合变换器(TFT)进行对比。
- 短期预测所有方法可行,长期预测仅TFT有效,因能融合未来条件信息。
- TFT注意力机制可识别老化关键转折点,揭示新失效模式。
半导体器件,尤其是MOSFET(金属氧化物半导体场效应晶体管),在电力电子中至关重要,但其可靠性受循环和温度影响的老化过程制约。离散半导体和功率模块的主要老化机制是键合线翘起,由热疲劳引起的裂纹扩展所致。该过程表现为指数增长及寿命的突然终结,使长期老化预测困难。本研究对多种老化预测方法进行了全面比较评估,涵盖经典追踪、统计预测与基于神经网络(NN)的模型,以及新型时序融合变换器(TFT)。在不同预测周期下评估其对MOSFET老化的预测能力。短期预测中,所有算法均表现良好,其中经典神经网络模型效果最佳,但计算成本较高。长期预测中,仅有TFT能生成有效结果,因其可整合未来预期条件的协变量。此外,TFT的注意力机制能识别关键老化转折点,指示新失效模式或加速老化阶段。
原文摘要 · Abstract (English)
Semiconductor devices, especially MOSFETs (Metal-oxide-semiconductor field-effect transistor), are crucial in power electronics, but their reliability is affected by aging processes influenced by cycling and temperature. The primary aging mechanism in discrete semiconductors and power modules is the bond wire lift-off, caused by crack growth due to thermal fatigue. The process is empirically characterized by exponential growth and an abrupt end of life, making long-term aging forecasts challenging. This research presents a comprehensive comparative assessment of different forecasting methods for MOSFET failure forecasting applications. Classical tracking, statistical forecasting and Neural Network (NN) based forecasting models are implemented along with novel Temporal Fusion Transformers (TFTs). A comprehensive comparison is performed assessing their MOSFET ageing forecasting ability for different forecasting horizons. For short-term predictions, all algorithms result in acceptable results, with the best results produced by classical NN forecasting models at the expense of higher computations. For long-term forecasting, only the TFT is able to produce valid outcomes owing to the ability to integrate covariates from the expected future conditions. Additionally, TFT attention points identify key ageing turning points, which indicate new failure modes or accelerated ageing phases.
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