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IGBT 模块应用中的寿命和可靠性
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IGBT 模块应用中的寿命和可靠性 系统寿命与可靠性关系: 可靠性:产品在一定条件下无故障完成规定功能的能力或可能性 IGBT 模块的失效模式: |
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功率周次 Power cycling: |
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测试方法: 加载自加热，周期≤ 3 秒，测试Δ Tvj |
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温度周次 Thermal cycling |
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失效机理是两种材料不同的膨胀系数(Different material’s CTE)[ppm/K] 不同应用下 IGBT 模块的寿命 |
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There are many applications and similar types of power modules. |
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温度变化导致的失效模式 |
2)reliability: wear out mechanisms which determine module lifetime as result of module reliability curves and thermal stresses Note: RBSOA and other electrical phenomena are not covered in the
presentation. TjIGBT max ≤ Tvi op |
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Reliability curves are always given by power module manufacturer绑定线老化——功率周次曲线 |
功率周次曲线修正因数
PC curve correction factor
基板焊层老化——热循环曲线
Solder on baseplate degradation – TC curve
功率温度循环(PC)次数评估计算
No. of cycle estimation calculation with Power cycling curve
实例:稳态周期系统的寿命估算
Simple mission cycle -- example of lifetime estimation
For relative simple mission cycles the module lifetime based on the three
presented reliability
curves and power losses converted into a junction and case temperature
swing can be easily
estimated. PrimePACKTM module in use: FF900R12IP4D
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实例:稳态周期系统的寿命估算 Final lifetime module estimation: |
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As reliability curves are given for 100% lifetime the module can work in
the example application 动态负载周期的寿命估算方法 |
Matlab calculates losses for given number of the load cycles and applies them to the thermal networks specific for selected module in Simulink. As a result the junction temperature profile for IGBT, Diode and the profile of the solder temperature is obtained.
In that case, the simulation will be stopped. Over the graph the information says, which element has higher temperature than allowed. If its below..
雨流计数法---随机负载谱转化为变幅或恒幅的负载谱 •把负载变化周次种类减少 •根据有限的试验数据推算整个寿命周期的变化规律，获得典型谱
From the temperature profile analysis the life time (and wear of the life time in %) for each element and solder will be calculated. The graphs will show the life time wear for each deltaT. The sum of the percents is calculated and also shown on the graph.
IGBT4 模块的性能提升
High performance of IGBT4 module
IGBT4 模块的 150 度最高允许工作结温，源于内部焊线工艺的改进，使其可靠性
指标-功率周次(PC)数大幅增加!
铜绑定线 Copper Bonding Wire-- EconoDUALTM3 600A
真正实现 EconoDUALTM3 最大输出电流能力--- @ TC=100°C, Tvj=175°C
降低引线电阻 R CC‘EE‘
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保证功率周次，满足风力发电，电动汽车需求 |
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PressFIT 端子压接技术 |
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高可靠性 减少工人焊接端子中失误导致的过温和静电损坏 可靠性已在多个高端客户的产品中得到验证 |
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超声波焊接的功率端子 Ultrasonic welded terminals功率端子采用超声波焊接 |
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已应用在以下的模块封装中:PrimePACK, IHM-B Traction series, EconoPACKTM4 |