Influence of Cassette Design upon Breakdown Performance of a 4.5kV Press-pack IGBT Module

In this paper, the influence of cassette design upon the breakdown performance of a 4.5kV press-pack IGBT module is investigated. Detailed numerical simulations show the influence of air gap and die position upon the breakdown performance of the assembly. Results show that gas rupture voltage is dependent upon the potential distribution within the PEEK cassette and silicon power device. Furthermore, forming a field-plate on the internal PEEK surface shows a significant reduction in electric field within the air gap.