不同固定方式下高压功率模块的抗冲击性能分析

覃峰; 李俊焘; 李金柱; 杨英坤; 高磊

doi:10.11883/bzycj-2021-0269

不同固定方式下高压功率模块的抗冲击性能分析

doi: 10.11883/bzycj-2021-0269

覃峰^{1, 2,},
李俊焘^{1, 2, ,},
李金柱³,
杨英坤^{1, 2},
高磊^{1, 2}

1.
中国工程物理研究院电子工程研究所，四川绵阳 621999
2.
微系统与太赫兹研究中心，四川成都 610200
3.
北京理工大学机电学院，北京 100081

基金项目: 科学挑战专题（TZ2018003）

详细信息

作者简介:
覃　峰（1992－　），男，硕士，助理研究员，qinfeng_mtrc@caep.cn

通讯作者:
李俊焘（1986－　），男，博士，副研究员，lijuntao_mtrc@caep.cn

中图分类号: O347.3；TP319
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- 文章访问数: 516
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-30
- 修回日期: 2022-02-22
- 网络出版日期: 2022-04-06
- 刊出日期: 2022-05-27

Analysis for impact resistance of the high-voltage power module with different fixed modes

QIN Feng^{1, 2
,},
LI Juntao^{1, 2
, ,},
LI Jinzhu³,
YANG Yingkun^{1, 2},
GAO Lei^{1, 2}

1.
Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Microsystem and Terahertz Research Center, Chengdu 610200, Sichuan, China
3.
School of Mechanical and Electrical Engineering, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为了提升高压功率模块在高速冲击环境中的结构可靠性，研究了高压功率模块采用不同固定方式的抗冲击特性。基于一维应力波条件，针对模块在自由式霍普金森杆系统中的运动响应以及能量转换形式进行理论分析，完成了模块的变形能与动能结果对比。采用有限元方法模拟了20 m/s冲击速度下模块的运动和变形过程，提取关键结构的应力分布、挠度、位移响应速度和加速度响应曲线，其中应力响应最高位置在陶瓷基板层，达到427 MPa，挠度响应最高位置在金属底板层，达到了773.8 μm，模块整体位移速度最高达到17.68 m/s，加速度最高达到51 110.7g。对比4种固定方式的冲击响应结果，模块冲击后底板变形量由小到大分别为面贴装固定、四角点固定、短边两点固定和长边两点固定，面贴装模块的位移动能和加速度峰值最大。结果表明采用面贴装固定的模块在冲击加速度载荷下发生变形失效的可能性最小，面贴装在四种固定方式中是可靠性最高的安装方式，之后的选择优先度分别是四角点固定、短边两点固定和长边两点固定。研究成果为半导体高压功率模块在实际应用中的安装固定方式选择提供了重要理论依据。
- 功率模块 /
- 固定方式 /
- 高速冲击 /
- 有限元方法
Abstract: High-voltage power module is a key component to realize stable current output. In order to improve the structural reliability of the high-voltage power module and optimize the fixed modes under high-speed impact, the impact resistance characteristics with different fixed modes are studied. Based on the one-dimensional stress wave theory, the comparison of deformation energy and kinetic energy of the module with different fixed modes are obtained by analyzing the dynamic response and energy conversion form of the module on the free Hopkinson pulse bar (FHPB). The finite element method is used to simulate the processes of motion and deformation under impact velocity of 20 m/s. The stress distributions, the deflection curves, the velocity curves, and the acceleration curves of the module under the same impact are obtained. It is found that the maximum stress (427 MPa) appears at the ceramic layer, while the maximum deflection (773.8 μm) occurs at the metal substrate layer. The magnitude of the maximum displacement speed is up to 17.68 m/s, and the magnitude of the maximum acceleration is up to 51 110.7g. By comparing the impact response results of the four fixed modes, the deformation of bottom substrate from small to large is the surface mounting, four-corner point fixing, two-point fixing on the short side and two-point fixing on the long side. The highest kinetic energy and acceleration are produced on the surface mounting modules. The results indicate that a minimum failure probability exists on surface mounting module under high impact loading. In summary, surface mounting is the most reliable fixed method among the four fixed methods. Then, the selection priorities are as following: the four-corner fixing, two-point fixing on the short side and two-point fixing on the long side. Out study results would provide an important theoretical basis of the mounting and fixing methods for semiconductor high-voltage power modules in practical application.
- high-voltage power module /
- fixed mode /
- high-speed impact /
- finite element method

HTML全文

图 1 自研功率模块的结构

Figure 1. The structure of self-developed module

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图 2 简化冲击受力

Figure 2. Simplified impact loading

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图 3 FHPB装置单侧冲击

Figure 3. Single-side impact of the FHPB

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图 4 入射杆对试样的作用示意图

Figure 4. The effect of the incident bar on the sample

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图 5 功率模块内部关键结构模型

Figure 5. The model of the main structure of the power module

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图 6 功率模块关键结构1/4模型

Figure 6. The 1/4 finite element model of the main structure of power module

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图 7 功率模块固定形式

Figure 7. Fixed forms of the plate-level power module

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图 8 模块FHPB冲击试验与数值模拟结果对比

Figure 8. Comparison between FHPB impact experiment and simulation of the module

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图 9 等效应力分布

Figure 9. Von Mises stress distribution

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图 10 不同层最大应力对比

Figure 10. Comparison of maximum stress in different layers

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图 11 底板过载加速度曲线

Figure 11. Acceleration-time curves of substrate

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图 12 底板动态冲击挠度曲线

Figure 12. Dynamic deflection-time curve of substrate

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图 13 底板冲击速度曲线

Figure 13. Dynamic velocity-time curve of substrate

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表 1 功率模块内部关键结构材料参数

Table 1. Material parameters of plate-level power module

结构	厚度 /mm	密度 /（kg·m⁻³）	弹性模量 /GPa	泊松比	屈服强度 /MPa
FHPB冲击系统	1500	7800	210	0.30	—
金属细支架	10	7800	210	0.30	—
铜底板	2	8930	117	0.34	286.0
覆铜层	0.3	8930	117	0.34	286.0
氮化铝陶瓷	0.6	3400	320	0.22	427.0
SAC305焊料	0.1	7400	33	0.32	55.3
纳米银焊料	0.1	10500	73.2	0.38	180.0
碳化硅芯片	0.2	3200	330	0.14	73.6

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表 2 四种固定方式下的冲击响应

Table 2. Impact response in four fixed modes

冲击加载方式	底板挠度/cm	最大等效应力/MPa	最大速度/（m·s⁻¹）	底板过载加速度峰值/g
Surface	0	15.32	17.68	51 110.7
4-corners-x	0.056 17	427	16.75	21 181.9
4-corners-y	0.004 96	427	16.75	21 181.9
2-points-S-x	0.077 38	427	16.22	19 000.9
2-points-S-y	0.013 15	427	16.22	19 000.9
2-points-L-x	0.068 33	427	15.91	30 339.5
2-points-L-y	0.028 26	427	15.91	30 339.5

下载: 导出CSV

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