Development of Conductor Laminated Insulation Sheet for High Withstand Voltage Double-Sided Direct Cooling Power Module

In recent years, in order to popularize electric vehicles, shortening charging time by using 800 V class batteries rather than conventional, 400 V class batteries has been attracting attention. To do this, higher-voltage inverters and power modules are required. In order to improve the withstand voltage of a double-sided direct-cooling power module that directly radiates power semiconductor heat generation from heat radiation fins on both sides through insulation sheets, the authors have developed a conductive laminated insulation sheet which solves a partial discharge voltage problem. In the conductive laminated insulation sheet, an intermediate conductive layer is laminated inside the insulating sheets. We have experimentally confirmed that the partial discharge voltage is 1.67 times higher than that of conventional sheets and that an intermediate conductive layer the same size as the lead frame electrode is optimal, and that its inductance performance is equivalent to that of a conventional sheet. © The Japan Institute of Electronics Packaging.