Bus bar interconnection techniques

An apparatus, comprising:

• a heat dissipating device defining a fastening site;
• a printed wiring board with electronic circuitry defining a bus with an interconnection pad and a board opening through at least a portion of the pad, the board opening being aligned with the fastening site;
• an electrical bus bar including a first electrical contact portion connected to the interconnection pad and a second electrical contact portion, the bus bar being sized and shaped to extend the second contact portion a predetermined distance away from the printed wiring board, the first electrical contact portion defining a bus bar opening aligned with the board opening, the bar opening defining at least a portion of a passage to the fastening site and being shaped to provide a clearance space between the bus bar and the printed wiring board;
• an electrically insulative grommet defining a distal end portion opposite a proximal end portion, the proximal end portion being shaped with a flange, the distal end portion being inserted into the passage with the flange of the proximal end portion abutting the bus bar about the bar opening;
• and
• a fastener extending through the grommet to provide a mechanical connection of the printed wiring board and the bus bar to the fastening site and maintain thermal coupling between the printed wiring board and the heat dissipating device while electrically insulating the fastener from the bus bar with the grommet.

An apparatus, comprising:

• an electric power generation system including an inverter assembly, the inverter assembly including:
• a cold plate defining a plurality of threaded cavities;
• a printed wiring board defining a number of interconnection pads and a plurality of board openings through the pads, the board being positioned to align each of the board openings with a corresponding one of the threaded cavities;
• a number of metallic bus members each including a contact foot, the contact foot defining one or more holes therethrough, the holes each aligning with a respective one of the board openings and the corresponding one of the threaded cavities to collectively define a number of passageways, the holes each being shaped with a larger opening on a bottom side than a top side to define a corresponding one of a number of clearance spaces;
• a number of washers each having a barrel-shaped portion opposite a respective flange portion, the washers each being positioned with the barrel-shaped portion being received in a respective one of the passageways with the respective flange portion abutting the contact foot about a corresponding one of the holes;
• and
• a number of fasteners each including a head opposite a stem with threading, the stem of each respective one of the fasteners extending through a respective one of the washers with the threading engaged to the corresponding one of the threaded cavities, the head of each of the fasteners bearing against the respective flange portion to exert a force to mechanically and thermally couple the bus bars and the printed wiring to one another and the cold plate.