Power conversion apparatus including wedge inserts

A power conversion apparatus comprising:

• a circuit body including a switching device;
• a base member forming a first concave portion and a cooling surface, and
• a wedge inserted in the first concave portion of the base member, wherein
• the first concave portion of the base member is formed by:
• a substrate portion forming the cooling surface;
• a first wall disposed on the opposite side of the substrate portion from the cooling surface;
• and an intermediate portion interconnecting the first wall and the substrate portion,
• the first wall forms an insertion space for insertion of the wedge, and a heat dissipating surface of the circuit body,
• the intermediate portion is plastically deformed by inserting the wedge into the insertion space, thus causing the first wall to be displaced toward the location of the circuit body,
• the intermediate portion is immediately adjacent to the insertion space and the circuit body,
• the insertion space defines on a first end thereof a cylindrical concavity, and
• a width of the insertion space gradually increases from a smallest width in a region of the insertion space that is immediately adjacent to the cylindrical concavity to a largest width at a second end of the insertion space that is farthest from the first end.