Enhancing Electrical Ruggedness in Double-Sided Cooled Power Modules

This paper explores the electrical ruggedness of double-sided cooled (DSC) power modules by focusing on the influence of the spacing between interfacing substrates on the voltage endurance of the assembly. For the first time, it is suggested to fill the silicone gel surrounding the dies with barium titanate (BaTiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> ) in this technology. The analysis relies on detailed numerical simulations performed with COMSOL Multiphysics. Results confirm the beneficial pushout effect dictated by a reduced spacing. Additionally, it is found that integrating BaTiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> increases the critical voltages that the module can withstand before the breakdown onset.