Bus bar module and power conversion system
A bus bar module is disposed over a plurality of housings to distribute DC power to smoothing capacitors and power conversion units. The bus bar module includes a first conductor and a second conductor. The first conductor is applied to either a first electrode or a second electrode of direct current. The second conductor is connected in parallel to the first conductor. The first conductor includes a first flat plate portion formed to have a first thickness in a cross section perpendicular to an extension direction. The second conductor includes a second flat plate portion having a cross section bent at a predetermined angle in a cross section perpendicular to the extension direction and formed with a second thickness thinner than the first thickness.
1 . A bus bar module disposed over a plurality of housings to distribute DC power to smoothing capacitors and power conversion units, comprising:
a first conductor applied to either a first electrode or a second electrode of direct current; and
a second conductor connected in parallel to the first conductor,
wherein the first conductor includes a first flat plate portion formed to have a first thickness in a cross section perpendicular to an extension direction,
the second conductor includes a second flat plate portion having a cross section bent at a predetermined angle in a cross section perpendicular to the extension direction and formed with a second thickness thinner than the first thickness, and
a thickness of the second conductor is twice or more a surface depth of a reference frequency higher in frequency than a carrier frequency of PWM control in the power conversion unit.
2 . The bus bar module according to claim 1 , wherein the thickness of the second conductor is thinner than a surface depth of a fundamental frequency of alternating current generated by the power conversion unit.
3 . The bus bar module according to claim 1 , wherein the reference frequency is associated with a frequency component generated by the carrier frequency.
4 . The bus bar module according to claim 1 , wherein the smoothing capacitor is connected to the first conductor through the second conductor.
5 . The bus bar module according to claim 1 , wherein a through hole that allows ventilation is provided in the second flat plate portion.
6 . The bus bar module according to claim 1 , wherein:
a flange is formed on a first end side of the second flat plate portion, and
a length of the flange in the extension direction is a part or whole of the length of the second conductor in the extension direction.
7 . A power conversion system which includes the bus bar module according to claim 1 ,
wherein a smoothing capacitor is disposed in a first housing among the plurality of housings, and
a power converter is disposed in a second housing among the plurality of housings.
8 . The power conversion system according to claim 7 comprising:
a forward converter that supplies DC power to the smoothing capacitor and the power converter.
9 . A power conversion system which includes the bus bar module according to claim 1 ,
wherein a first smoothing capacitor and a first power unit disposed in a first housing;
a second smoothing capacitor and a second power unit disposed in a second housing;
the first smoothing capacitor and the second smoothing capacitor are included in the smoothing capacitors; and
the first power unit and the second power unit are included in the power conversion units.
10 . A bus bar module disposed over a plurality of housings to distribute DC power to smoothing capacitors and power conversion units, comprising:
a first conductor applied to either a first electrode or a second electrode of direct current; and
a second conductor connected in parallel to the first conductor,
wherein the first conductor includes a first flat plate portion formed to have a first thickness in a cross section perpendicular to an extension direction, and
the second conductor includes a second flat plate portion having a cross section bent at a predetermined angle in a cross section perpendicular to the extension direction and formed with a second thickness thinner than the first thickness;
wherein the cross section of the second flat plate portion is bent in an L shape,
a first end side of the second flat plate portion bent to form a flange is in contact with a surface of the first conductor, and
a second end portion of the second flat plate portion connected to the first end extends in a direction away from the first conductor.
11 . A bus bar module disposed over a plurality of housings to distribute DC power to smoothing capacitors and power conversion units, comprising:
a first conductor applied to either a first electrode or a second electrode of direct current;
a second conductor connected in parallel to the first conductor; and
a third conductor connected in parallel to the first conductor,
wherein the first conductor includes a first flat plate portion formed to have a first thickness in a cross section perpendicular to an extension direction,
the second conductor includes a second flat plate portion having a cross section bent at a predetermined angle in a cross section perpendicular to the extension direction and formed with a second thickness thinner than the first thickness, and
the third conductor includes a third flat plate portion having a cross section bent at a predetermined angle in a cross section perpendicular to the extension direction and formed to have a third thickness thinner than the first thickness.
12 . The bus bar module according to claim 11 , wherein:
a cross section of the third flat plate portion is bent in an L shape, and
the second flat plate portion and the third flat plate portion extend in a direction away from the first conductor.
13 . The bus bar module according to claim 11 , wherein a shape and an area of the cross section of the first conductor, and a shape and an area of the cross section of the second conductor are determined based on a magnitude of the direct current component and a magnitude of the alternating current.