Thermal Stability of Vertical Type Shunt Resistors for Use in Double Side Cooling SiC Power Modules

This study presents the design and development of vertical-type shunt resistors with a compact form factor, specifically tailored for use in high-power-density SiC power modules. The newly developed vertical shunt resistors achieve significant reductions in both geometrical volume and resistance, with a measured resistance as low as 42 µΩ. Additionally, the vertical configuration effectively minimizes the welding heat-affected zone (HAZ) during manufacturing, outperforming conventional shunt resistors. The advanced vertical shunt resistors developed by KOSTECSYS exhibit exceptional microstructural integrity, maintaining robust reliability of the diffusion-bonded Cu/Mn/Cu interfaces even after thermal aging for 500 hours at 250°C.