ELECTRIC POWER CONVERTER

• US 20140140117A1
• Filed: 08/06/2013
• Published: 05/22/2014
• Est. Priority Date: 11/21/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: ISHIBASHI, Satoshi
• Granted Patent: US 9,439,324 B2
• Time in Patent Office: Days
• US Class Current: 363/141
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 7/20254 Cold plates transferring heat from heat source to coolant
• CPC Class Codes: H05K 7/20927 Liquid coolant without phase change

Abstract

The passage from a cooling medium inlet to a cooling medium outlet of a cooler includes: an upstream cooling portion and a downstream cooling portion for cooling heat generating bodies; an upstream distribution portion located on the cooling medium inlet side; a downstream distribution portion located on the cooling medium outlet side; a connecting portion for connecting the upstream cooling portion and the downstream cooling portion; and a partition portion for partitioning the upstream cooling portion and the downstream cooling portion, and the upstream distribution portion and the downstream distribution portion. The passage is connected so that the cooling medium flows in order of the upstream distribution portion, the upstream cooling portion, the connecting portion, the downstream cooling portion, and the downstream distribution portion.

Claims

1. An electric power converter, comprising:

a cooler, which includes a passage through which a cooling medium flows; and

at least two heat generating bodies, which are dispersedly arranged on two opposing main surfaces of the cooler to be cooled by the cooler,

wherein the passage from a cooling medium inlet to a cooling medium outlet of the cooler includes;

an upstream cooling portion and a downstream cooling portion for cooling the at least two heat generating bodies;

an upstream distribution portion located on the cooling medium inlet side;

a downstream distribution portion located on the cooling medium outlet side;

a connecting portion for connecting the upstream cooling portion and the downstream cooling portion; and

a partition portion for partitioning the upstream cooling portion and the downstream cooling portion, and the upstream distribution portion and the downstream distribution portion, and

wherein the passage is connected so that the cooling medium flows in order of the upstream distribution portion, the upstream cooling portion, the connecting portion, the downstream cooling portion, and the downstream distribution portion.

2. An electric power converter according to claim 1, wherein an allowable temperature of the heating element mounted on the downstream cooling portion is higher than an allowable temperature of the heating element mounted on the upstream cooling portion.

3. An electric power converter according to claim 1, wherein the heating element mounted on the downstream cooling portion comprises a wide bandgap semiconductor.

4. An electric power converter according to claim 3, wherein the wide bandgap semiconductor comprises at least one element selected from the group consisting of:

silicon carbide;

a gallium nitride-based material; and

diamond.

5. An electric power converter according to claim 1, wherein an amount of heat generated by the heating element mounted on the upstream cooling portion is larger than an amount of heat generated by the heating element mounted on the downstream cooling portion.

6. An electric power converter according to claim 1, wherein the heating element mounted on the upstream cooling portion comprises a switching element.

7. An electric power converter according to claim 1, wherein the heating element mounted on the downstream cooling portion comprises a converter for controlling a supply voltage.

8. An electric power converter according to claim 1, wherein the heating element mounted on the upstream cooling portion comprises a semiconductor module to be used in a power converter for controlling a motor for driving a vehicle.

9. An electric power converter according to claim 1, wherein a passage cross sectional area of the connecting portion and passage cross sectional areas of the upstream cooling portion and the downstream cooling portion are substantially equal.

10. An electric power converter according to claim 1, wherein a passage cross sectional area of the upstream distribution portion is reduced farther from the cooling medium inlet side, and a passage cross sectional area of the downstream distribution portion is increased closer to the cooling medium outlet side.

11. An electric power converter according to claim 1,

wherein the cooler comprises:

cooling fins integrated with heating element mounting plates; and

a passage housing integrated with the partition plate,

wherein the cooling fins integrated with the heating element mounting plates are made of aluminum and processed by extrusion, and then a surface on which the at least two heat generating bodies are not mounted is processed by one of cutting and forging so that parts of the at least two heat generating bodies are arranged on a plane including at least one of the connecting portion, and the upstream distribution portion and the downstream distribution portion, and

wherein the at least one of the connecting portion, and the upstream distribution portion and the downstream distribution portion has a part of a function of the upstream cooling portion and the downstream cooling portion.

12. An electric power converter according to claim 1,

wherein the cooler comprises:

cooling fins integrated with heating element mounting plates; and

a passage housing integrated with the partition plate,

wherein a through hole formed in the partition plate constitutes the connecting portion, and a concavity and convexity formed in the partition plate constitutes the upstream distribution portion and the downstream distribution portion, and

wherein at least one of the cooling fins integrated with the heating element mounting plates and the passage housing integrated with the partition plate are bonded by one of welding and brazing.

13. An electric power converter according to claim 1,

wherein the cooler comprises heating element mounting plates, cooling fins, and the partition plate,

wherein a through hole formed in the partition plate constitutes the connecting portion, and

wherein the heating element mounting plates, the cooling fins, and the partition plate are bonded by brazing to constitute a part of the passage.