Laminated bus bar, power converter, power conversion device, and uninterruptible power supply device

1. A laminated bus bar for use in a power converter capable of bidirectional power conversion, the laminated bus bar comprising:

a flat plate portion having a length direction, a width direction orthogonal to the length direction, and a thickness direction orthogonal to the length direction and the width direction,

the flat plate portion including

a first conductive plate having a first AC terminal and a second AC terminal,

a second conductive plate having a first positive DC terminal and a second positive DC terminal,

a third conductive plate having a first negative DC terminal and a second negative DC terminal, and

first to fourth insulating plates alternately stacked in the thickness direction for the first to third conductive plates, wherein

the flat plate portion has a first end portion in the length direction of the flat plate portion and a second end portion on an opposite side to the first end portion,

in the first end portion,

the first AC terminal protrudes from the first conductive plate in the length direction,

the first positive DC terminal protrudes from the second conductive plate in the length direction,

the first negative DC terminal protrudes from the third conductive plate in the length direction, and

the first AC terminal, the first positive DC terminal, and the first negative DC terminal are arranged in alignment in this order from a third end portion in the width direction of the flat plate portion toward a fourth end portion on an opposite side to the third end portion, and

in the second end portion,

the second AC terminal protrudes from the first conductive plate in the length direction,

the second positive DC terminal protrudes from the second conductive plate in the length direction,

the second negative DC terminal protrudes from the third conductive plate in the length direction, and

the second AC terminal, the second negative DC terminal, and the second positive DC terminal are arranged in alignment in this order from the third end portion toward the fourth end portion of the flat plate portion.

2. The laminated bus bar according to claim 1 , wherein

the first positive DC terminal and the second negative DC terminal are arranged at positions facing each other in the length direction with the flat plate portion interposed therebetween, and

the first negative DC terminal and the second positive DC terminal are arranged at positions facing each other in the length direction with the flat plate portion interposed therebetween.

3. The laminated bus bar according to claim 2 , wherein the first AC terminal and the second AC terminal are arranged at positions facing each other in the length direction with the flat plate portion interposed therebetween.

4. A power converter comprising:

a semiconductor module having a first terminal, a second terminal, and an AC terminal; and

the laminated bus bar of claim 1 , wherein

the flat plate portion has a plurality of through holes passing through in the thickness direction,

the first conductive plate is connected to the AC terminal of the semiconductor module at a first through hole of the plurality of through holes,

the second conductive plate is connected to the first terminal of the semiconductor module at a second through hole of the plurality of through holes, and

the third conductive plate is connected to the second terminal of the semiconductor module at a third through hole of the plurality of through holes.

5. The power converter according to claim 4 , further comprising a capacitor electrically connected between the first terminal and the second terminal, wherein

the second conductive plate is connected to a positive electrode terminal of the capacitor at a fourth through hole of the plurality of through holes, and

the third conductive plate is connected to a negative electrode terminal of the capacitor at a fifth through hole of the plurality of through holes.

6. A power conversion device comprising:

a first power converter;

a second power converter; and

a stage in a shape of a flat plate, the stage having the first power converter and the second power converter mounted thereon, wherein

the first power converter includes a first semiconductor module and a first laminated bus bar connected to the first semiconductor module,

the second power converter includes a second semiconductor module and a second laminated bus bar connected to the second semiconductor module,

each of the first and second laminated bus bars is configured with the laminated bus bar of claim 1 , and

the first power converter and the second power converter are arranged in alignment in the length direction such that the first end portion of the first laminated bus bar and the second end portion of the second laminated bus bar face each other in the length direction, and the respective fourth end portions are aligned in the length direction,

the power conversion device further comprising:

a DC positive bus that electrically connects the first positive DC terminal of the first laminated bus bar and the second positive DC terminal of the second laminated bus bar;

a DC negative bus that electrically connects the first negative DC terminal of the first laminated bus bar and the second negative DC terminal of the second laminated bus bar;

a first fuse connected between the first positive DC terminal of the first laminated bus bar and the DC positive bus;

a second fuse connected between the DC positive bus and the second positive DC terminal of the second laminated bus bar;

a third fuse connected between the first negative DC terminal of the first laminated bus bar and the DC negative bus; and

a fourth fuse connected between the DC negative bus and the second negative DC terminal of the second laminated bus bar, wherein

in a two-dimensional view as viewed from the width direction,

the first fuse and the second fuse are arranged in alignment in the length direction,

the third fuse is arranged in alignment with the first fuse in the thickness direction,

the fourth fuse is arranged in alignment with the second fuse in the thickness direction, and

the third fuse and the fourth fuse are arranged in alignment in the length direction.

7. The power conversion device according to claim 6 , wherein

in a two-dimensional view as viewed from the thickness direction,

the first fuse and the fourth fuse are arranged in alignment in the length direction, and

the third fuse and the second fuse are arranged in alignment in the length direction.

8. The power conversion device according to claim 6 , wherein

the DC positive bus includes a first conductive member in a strip-like shape extending in the width direction,

the DC negative bus includes a second conductive member in a strip-like shape extending in the width direction, and

the first conductive member and the second conductive member are arranged in alignment in the thickness direction.

9. The power conversion device according to claim 6 , wherein

the first power converter is a converter, and

the second power converter is an inverter.

10. An uninterruptible power supply device comprising:

the power conversion device of claim 9 ; and

a power storage device connected between the DC positive bus and the DC negative bus, wherein

the second AC terminal of the first power converter is connected to an AC power supply, and

the first AC terminal of the second power converter is connected to a load.