Electric power converter

摘要

An electric power converter has a stacked body formed by stacking a plurality of semiconductor modules and coolers, a capacitor, and positive and negative bus bars. Each of the bus bars is formed by two sheets of plate members, respectively. Each of the plate members has a body portion, a plurality of extended portions, and a plurality of terminal connecting portions. The terminal connecting portions are connected to power terminals of the semiconductor modules. The main body portion of each plate member are joined to each other so that the terminal connecting portion of the one of the plate members and the terminal connecting portion 44 of the other one of the plate member are disposed alternately in a stacking direction of the stacked body.

主权项

1. An electric power converter comprising:
a stacked body formed by stacking a plurality of semiconductor modules having power terminals projecting from a sealed portion where a semiconductor element is sealed and coolers that cool the semiconductor modules; a capacitor for smoothing a DC voltage; and a bus bar that electrically connects the power terminals and the capacitor, wherein: the bus bar of the same potential is made of a plurality of plate members that are electrically connected to each other; each of the plate members is provided with a body portion disposed so that a main surface thereof is perpendicular with respect to a projecting direction of the power terminals; a plurality of extended portions is extending from the main body portion in an extending direction perpendicular to both a stacking direction of the stacked body and the projecting direction; terminal connecting portions are erected in the projecting direction from each of the extended portions; a main surface of the terminal connecting portion is perpendicular with respect to the stacking direction; the terminal connecting portions are joined to the power terminals and are connected to each other; the main body portion of each plate member are joined to each other to form the bus bar so that the terminal connecting portions formed in the same plate member do not adjoin to each other in the stacking direction; the bus bar is formed by combining the plurality of plate members while the extended portions extend toward the same direction; the capacitor has a plurality of capacitor elements that are connected in parallel to each other; each of the plate members that constitutes the bus bar is connected to a respective one of the capacitor elements; the plurality of capacitor elements includes a proximate capacitor element disposed at a position close to the sealed portion in the projecting direction and a distant capacitor element disposed farther from the sealed portion in the projecting direction than the proximate capacitor element the bus bar includes (i) a positive bus bar constituted by a proximal plate member disposed at a position close to the sealed portion in the projecting direction and a distal plate member disposed at a position farther from the sealed portion than the proximal plate member of the positive bus bar, and (ii) a negative bus bar constituted by a proximal plate member disposed at a position close to the sealed portion in the projecting direction and a distal plate member disposed at a position farther from the sealed portion than the proximal plate member of the negative bus bar; the distal plate member of the positive bus bar is connected to a positive electrode of the distant capacitor element, and the proximal plate member of the positive bus bar is connected to a positive electrode of the proximate capacitor element; and the distal plate member of the negative bus bar is connected to a negative electrode of the distant capacitor element, and the proximal plate member of the negative bus bar is connected to the negative electrode of the proximate capacitor element.