Patent ID: 8531840

Claim:
A power conversion apparatus, comprising: a plurality of semiconductor modules which have a body part incorporating a switching element configuring a power conversion circuit, and in which power terminals, which conduct electricity to the switching element, project from the body part; and a plurality of bus bars to which the power terminals are connected; wherein the plurality of power terminals include a positive electrode power terminal, a negative electrode power terminal, and an AC power terminal, the positive electrode power terminal being electrically connected to a positive electrode of a DC power source, the negative electrode power terminal being electrically connected to a negative electrode of the DC power source, and the AC power terminal being electrically connected to an AC load, the plurality of bus bars include a positive electrode bus bar, a negative electrode bus bar, and a plurality of AC bus bars, the positive electrode bus bar being connected to the positive electrode power terminal, the negative electrode bus bar being connected to the negative electrode power terminal, and the plurality of AC bus bars being connected to the AC power terminal, a DC bus bar group includes the positive electrode bus bar and the negative electrode bus bar, an AC bus bar group includes the plurality of AC bus bars, a part of one of the bus bar groups is sealed with an insulating resin, and the other of the bus bar groups is not sealed with the insulating resin, a seat is formed on the insulating resin sealing the one of the bus bar groups, and the other of the bus bar groups is mounted on a seat face of the seat, the one of the bus bar groups is the AC bus bar group, and the other of the bus bar groups is the DC bus bar group, and the positive electrode bus bar and the negative electrode bus bar configuring the other of the bus bar groups have through-holes penetrating in the thickness direction thereof, a plurality of nuts opened from the seat face of the seat are inserted into the insulating resin at positions corresponding to the through-holes, and the other of the bus bar groups is fixed to the insulating resin by inserting bolts into the through-holes and screwing the bolts into the nuts.