Thermal/Mechanical Characteristics Simulation Analysis of Solder Layer Damage in IGBT Modules

Area of Science:

• Power Electronics
• Materials Science
• Reliability Engineering

Background:

• Insulated Gate Bipolar Transistors (IGBTs) are crucial in industrial applications like renewable energy and smart grids.
• The thermal performance and failure mechanisms of IGBT solder layers under stress are under-researched.
• Understanding solder layer integrity is vital for IGBT module longevity.

Purpose of the Study:

• To investigate the impact of solder layer defects on IGBT module thermal performance and stress distribution.
• To model and simulate the effects of various solder void types, sizes, and positions.
• To provide a theoretical basis for enhancing IGBT module anti-damage and failure resistance.

Main Methods:

• Developed a 3D geometric model of an IGBT module.
• Constructed a finite element model for coupled thermal/mechanical multi-physics simulations using ANSYS Workbench.
• Simulated 37 defect scenarios of IGBT modules with damaged solder layers, analyzing thermal cycling effects.

Main Results:

• Simulations quantified stress patterns and temperature distribution in the solder layer.
• Identified highest stress at the solder layer edge (6.2504 × 10^7 Pa) and lowest junction temperature (70.79 °C).
• Central solder layer damage increased the highest junction temperature to 72.562 °C.

Conclusions:

• Solder layer defects significantly influence IGBT module temperature, heat dissipation, and thermal stress.
• The study provides critical data for improving the reliability and preventing failures in IGBT modules.
• Results support the development of more robust high-power devices.