李孟川　孟志强　胡毅　王俊　何泽　邹翔　焦文豪　欧阳红林

摘   要：通过测试电路与数字滤波技术，探究了一种电力电子器件关断机械应力波的测量方法;通过信号处理与频谱分析得到了机械应力波的时域和频域特征参数，如幅值、峰峰值、峰值频率和频率范围.研究结果表明：合理设置采样阈值和阻带频率能够测量机械应力波;IKW40T120型IGBT器件在关断40 A电流时，关断机械应力波的幅值为5.2 mV、峰峰值为9.6 mV，时域波形约持续100 μs且振幅衰减，其幅值频谱明显存在3个频率段，分别为20～100 kHz、150～200 kHz和290～310 kHz，每个频率段具有1个峰值频率点，分别为54 kHz、163 kHz和299 kHz，几乎呈现1倍、3倍、5倍频关系，三峰值频率点对应的峰值差异较大，分别为1.24 mV、0.69 mV和0.36 mV.

关键词：电力电子器件;关断过程;机械应力波;状态监测;可靠性

中图分类号：TN32;TB52                    文献标志码：A

Experimental Study of Mechanical Stress Wave

in Power Electronics Device

LI Mengchuan1，MENG Zhiqiang1，HU Yi1，WANG Jun1，HE Yunze1，2，

ZOU Xiang1，JIAO Wenhao1，OUYANG Honglin1

（1. College of Electrical and Information Engineering，Hunan University，Changsha 410082，China;

2. Fujian Province University Key Laboratory of Nondestructive Testing，Fuqing Branch

of Fujian Normal University，Fuqing 350300，China）

Abstract：This paper studied a method for measuring the mechanical stress wave in power electronic device by means of test circuit and digital filtering technology. Time domain and frequency domain characteristic parameters of mechanical stress wave，such as amplitude，peak-to-peak，peak frequency，and frequency range，were obtained through signal processing and spectrum analysis. The research results show that the mechanical stress wave can be measured by setting the sampling threshold and stopping the band frequency reasonably. When a current of 40 A in IKW40T120 IGBT device is turned off，the mechanical stress wave continues to decay for 100 μs，and its amplitude and peak-to-peak value are 5.2 mV and 9.6 mV，respectively. The amplitude spectrum clearly has three frequency segments that are 20～100 kHz，150～200 kHz and 290～310 kHz. Each frequency segment has one peak frequency point，which is 54 kHz，163 kHz and 299 kHz，respectively，showing almost 1，3 and 5 octave relationship. The peaks corresponding to three peak frequency points differ greatly，which are 1.24 mV，0.69 mV and 0.36 mV，respectively.

Key words：power electronics device;turn-off process;mechanical stress wave;condition monitoring;reliability

电力电子器件和模块在电气节能、新能源发电、电力牵引、智能电网等领域得到了广泛的应用，对国民经济发展起着重要作用[1].电力电子器件和模块发生故障或性能退化，会对电力系统和使用电力电子设备的系统正常运行构成危害，并带来巨大的经济损失.因此，高效、简洁、实时的电力电子器件与模块状态监测技术是保障电力电子设备可靠性的重要方式.近年来，电力电子设备应用的迅猛发展对检测技术提出了一些特殊的要求，主要体现为快速检测[2]、非侵入式检测[3]、实时在线检测[4]方面.

国内外专家和学者越来越重视电力电子器件和模块的可靠性研究，对器件和模块的……