Power conversion apparatus and manufacturing method for the same

A power conversion apparatus including a plurality of semiconductor modules each including a main body portion with a built-in semiconductor device and a power terminal protruding from the main body portion;

• a capacitor smoothing a DC voltage;
• and
• a pair of bus bars, wherein
• the power terminals include a pair of DC terminals electrically connected to the capacitor via the bus bars and an AC terminal electrically connected to an AC load,
• the plurality of semiconductor modules are arrayed in a thickness direction of the power terminals,
• each of the bus bars includes terminal connection portions joined and welded to the respective DC terminals and a common portion electrically connected to the plurality of terminal connection portions,
• the common portions are arranged between the sets of the plurality of power terminals adjacent to each other in a width direction orthogonal to a protruding direction and the thickness direction of the power terminals, and an insulation member is interposed between the pair of common portions to insulate the common portions from each other, and
• each of the bus bars includes high-thermal-resistance portions each formed between the corresponding terminal connection portion and the corresponding common portion to electrically connect the terminal connection portion and the common portion together, the high-thermal-resistance portion offering a higher thermal resistance than the terminal connection portion.