Patent ID: 8519561

Claim:
A power module, comprising: an upper arm circuit unit and a lower arm circuit unit, each including a power semiconductor element; an insulating substrate with the upper arm circuit unit and the lower arm circuit unit mounted on one surface thereof; a metal base bonded onto the other surface of the insulating substrate which is opposite to the one surface where the upper and lower arm circuit units are mounted; a first connection terminal for supplying a high potential to the upper arm circuit unit from outside; a second connection terminal for supplying a low potential to the lower arm circuit unit from outside; an insulating sheet interposed between the first connection terminal and the second connection terminal; and a resin case disposed on the metal base to support the first and second connection terminals, wherein the first and second connection terminals are flat conductors and laminated with the insulating sheet sandwiched between them; wherein the insulating sheet extends from one end of the laminated structure so as to secure the creepage distance between the first and second connection terminals; wherein the resin case is furnished with a recess for containing the laminated structure of the first and second connection terminals and the insulating sheet; wherein the ends of each of the first and second connection terminals are provided with external connection lugs for connection with the power module, and the insulating sheet extends close to the external connection lugs; wherein the resin case is provided with screw sections for screwing down the external connection lugs, the screw section being capable of transferring the stress imposed on the external connection lugs to the resin case; and wherein the exposed portion of the insulating sheet that protrudes from the lamination is covered with insulating gel so that the creepage distance of the insulating sheet can be diminished.