High heat dissipation and high heat durability technologies for transfer-molded power modules with insulating sheets

Conference: CIPS 2016 - 9th International Conference on Integrated Power Electronics Systems
03/08/2016 - 03/10/2016 at Nürnberg, Deutschland

Proceedings: CIPS 2016

Pages: 5Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Authors:
Nishimura, Takashi; Mimura, Kenji; Yamamoto, Kei; Idaka, Shiori; Shinohara, Toshiaki (Advanced Technology R&D Center, Mitsubishi Electric Corp., 8-1-1 Tsukaguchi-Honmachi, Amagasaki, Hyogo, 661-8661, Japan)

Abstract:
Investigations of high heat dissipation and high heat durability technologies were carried out for the transfer-molded power module (T-PM) with insulating sheets. The thermal conductivity of the insulating sheet with an agglomerated BN filler as the thermal conductive material was improved drastically, and was three times larger than the conventional insulating sheet. The advanced insulating sheet reduced the thermal resistance of the first T-PM by 15 %. On the other hand, the electrical resistivity of the advanced insulating sheet at high temperature was enhanced three digits by improving the curing system of the epoxy resin. Furthermore, as a result of the molding resin being improved, the glass transition temperature of the resin increased by 13 °C, and the elastic modulus and the linear expansion coefficient of the resin was reduced remarkably. Consequently the durability of the T-PM in a high temperature bias test (DC1kV bias @ 200 °C) has been greatly improved using the developed insulating sheet and the molding resin. In addition, a power cycle test at high temperature (Tj-max = 200 °C, DeltaTj = 80 °C) showed stable operation even over 100K cycles.