Patent ID: 7723244

Claim:
A method for internal electrical insulation of a substrate for a power semiconductor module having a framelike insulating housing with a cap and having an insulating substrate with at least one conductor track and at least one power semiconductor component mounted thereon, and at least one connection for connecting said power semiconductor component to at least one of connection elements, further conductor tracks and power semiconductor components, the method comprising the following steps: forming said substrate with said at least one power semiconductor component and said at least one connection, said substrate having a longitudinal axis; coating said substrate with a viscous dielectric insulation compound in a casting process; initiating the cross-linking of said insulation compound; rotating said substrate about said longitudinal axis so that said insulation compound securely envelops said at least one connection thereby permitting excess insulation compound to drip off, wherein during the dripping off of said insulation compound, said substrate is intermittently rotated about a vertical axis thereof, so as to speed up the dripping-off process; and placing said substrate in said housing.