POWER CONVERSION DEVICE

• US 20160111976A1
• Filed: 03/14/2014
• Published: 04/21/2016
• Est. Priority Date: 06/17/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation, Tmeic Corporation (Toshiba Corporation)
• Original Assignee: Mitsubishi Electric Corporation, Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Inventors: KOYANAGI, Kimiyuki, KINOSHITA, Masahiro
• Granted Patent: US 9,559,612 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 7/537 using semiconductor devices only, e.g. single switched pulse inverters
• CPC Class Codes: H05K 7/14329 specially adapted for the configuration of power bus bars

Abstract

Four bus bars, which are two positive-electrode-side bus bars connecting a positive electrode of a capacitor series circuit and a positive electrode of a power conversion section, a negative-electrode-side bus bar connecting a negative electrode of the capacitor series circuit and a negative electrode of the power conversion section, and an intermediate connection bus bar connecting in series two smoothing capacitors in the capacitor series circuit, are stacked in close contact with one another via insulating layers, to form a 4-layer bus bar. The two positive-electrode-side bus bars are not adjacent to each other and are connected in parallel to each other. The positive-electrode-side bus bar which is one of them and the negative-electrode-side bus bar are disposed adjacent to each other, thereby to reduce DC wiring inductances of the wiring structure in which the capacitor series circuit and the power conversion section are connected.

Claims

1. A power conversion device comprising:

a capacitor series circuit composed of a first smoothing capacitor and a second smoothing capacitor connected in series to each other; and

a power conversion section including a plurality of semiconductor switching elements and for performing power conversion between DC power of the capacitor series circuit and AC power,

the power conversion device further comprising;

a first connection line connecting a positive electrode of the capacitor series circuit and a positive electrode of the power conversion section;

a second connection line connecting a negative electrode of the capacitor series circuit and a negative electrode of the power conversion section; and

a third connection line connecting in series the first smoothing capacitor and the second smoothing capacitor, wherein

one of the first and second connection lines is composed of two bus bars that are not adjacent to each other and that are connected in parallel to each other, the other of the first and second connection lines is composed of one bus bar disposed so as to be adjacent to one of the two bus bars connected in parallel to each other, the third connection line is composed of one bus bar, and the four bus bars in total are stacked in close contact with one another via insulating layers to form a stacked bus bar.

2. The power conversion device according to claim 1, wherein

the four bus bars are disposed such that directions in which currents flow in bus bars that are adjacent to each other are opposite to each other.

3. The power conversion device according to claim 1, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, and the bus bar of the second connection line and the bus bar of the third connection line are disposed between the two bus bars.

4. The power conversion device according to claim 1, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, the bus bar of one of the second and third connection lines is disposed between the two bus bars, and the bus bar of the other of the second and third connection lines is disposed outside of the two bus bars.

5. The power conversion device according to claim 1, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, and

the capacitor series circuit is connected to a first side in a longitudinal direction of the stacked bus bar, the power conversion section is connected to a second side in the longitudinal direction of the stacked bus bar, and connection points A for connecting the positive electrode of the capacitor series circuit and the bus bars of the first connection line, a connection point B for connecting the first smoothing capacitor and the bus bar of the third connection line, and a connection point C for connecting the second smoothing capacitor and the bus bar of the third connection line are arranged in an order of the connection points A, the connection point B, and the connection point C from the first side end of the stacked bus bar toward the second side thereof.

6. The power conversion device according to claim 1, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, and the bus bar of the first connection line and the bus bar of the third connection line are disposed between the two bus bars.

7. The power conversion device according to claim 1, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, the bus bar of one of the first and third connection lines is disposed between the two bus bars, and the bus bar of the other of the first and third connection lines is disposed outside of the two bus bars.

8. The power conversion device according to claim 1, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, and

the capacitor series circuit is connected to a first side in a longitudinal direction of the stacked bus bar, the power conversion section is connected to a second side in the longitudinal direction of the stacked bus bar, and connection points D for connecting the negative electrode of the capacitor series circuit and the bus bars of the second connection line, a connection point B for connecting the first smoothing capacitor and the bus bar of the third connection line, and a connection point C for connecting the second smoothing capacitor and the bus bar of the third connection line are arranged in an order of the connection points D, the connection point C, and the connection point B, from the first side end of the stacked bus bar toward the second side thereof.

9. The power conversion device according to claim 2, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, and the bus bar of the second connection line and the bus bar of the third connection line are disposed between the two bus bars.

10. The power conversion device according to claim 2, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, the bus bar of one of the second and third connection lines is disposed between the two bus bars, and the bus bar of the other of the second and third connection lines is disposed outside of the two bus bars.

11. The power conversion device according to claim 2, wherein

the first connection line is composed of the two bus bars connected in parallel to each other, and

the capacitor series circuit is connected to a first side in a longitudinal direction of the stacked bus bar, the power conversion section is connected to a second side in the longitudinal direction of the stacked bus bar, and connection points A for connecting the positive electrode of the capacitor series circuit and the bus bars of the first connection line, a connection point B for connecting the first smoothing capacitor and the bus bar of the third connection line, and a connection point C for connecting the second smoothing capacitor and the bus bar of the third connection line are arranged in an order of the connection points A, the connection point B, and the connection point C from the first side end of the stacked bus bar toward the second side thereof.

12. The power conversion device according to claim 2, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, and the bus bar of the first connection line and the bus bar of the third connection line are disposed between the two bus bars.

13. The power conversion device according to claim 2, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, the bus bar of one of the first and third connection lines is disposed between the two bus bars, and the bus bar of the other of the first and third connection lines is disposed outside of the two bus bars.

14. The power conversion device according to claim 2, wherein

the second connection line is composed of the two bus bars connected in parallel to each other, and

the capacitor series circuit is connected to a first side in a longitudinal direction of the stacked bus bar, the power conversion section is connected to a second side in the longitudinal direction of the stacked bus bar, and connection points D for connecting the negative electrode of the capacitor series circuit and the bus bars of the second connection line, a connection point B for connecting the first smoothing capacitor and the bus bar of the third connection line, and a connection point C for connecting the second smoothing capacitor and the bus bar of the third connection line are arranged in an order of the connection points D, the connection point C, and the connection point B, from the first side end of the stacked bus bar toward the second side thereof.