Low-inductance power semiconductor module

• US 5,574,312 A
• Filed: 05/05/1995
• Issued: 11/12/1996
• Est. Priority Date: 06/17/1994
• Status: Expired due to Fees

• Current Assignee: ABB Management AG (ABB Limited)
• Original Assignee: ABB Management AG (ABB Limited)
• Inventors: Bayerer, Reinhold, Stockmeier, Thomas
• Primary Examiner(s): Jackson, Jerome
• Assistant Examiner(s): Clark, S. V.
• Application Number:
  US08/435,617
• Time in Patent Office: 557 Days
• Field of Search: 257/714, 257/715, 257/716, 257/718, 257/719, 257/706, 257/707, 257/705, 257/723, 257/724, 257/691, 257/712
• US Class Current: 257/706
• CPC Class Codes: H01L 23/473 by flowing liquids H01L23/4332, H01L23/4338 take precedence
• CPC Class Codes: H01L 25/0652 the devices being arranged next and on each other, i.e. mixed assemblies
• CPC Class Codes: H01L 25/071 the devices being arranged next and on each other, i.e. mixed assemblies
• CPC Class Codes: H01L 25/18 the devices being of types provided for in two or more different subgroups of the same main group of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N
• 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: H01L 2924/3011 Impedance
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 7/14329 specially adapted for the configuration of power bus bars
• CPC Class Codes: H05K 7/20927 Liquid coolant without phase change

Abstract

In the case of a power semiconductor module (1) according to the invention, substrates (8) having a power semiconductor assembly (2) are fitted on both sides of a heat sink (3). The power semiconductor assemblies (2) are made contact with by a stack of contact laminates (4), which contact laminates (4) run parallel to the heat sink (3). A very low-inductance structure is obtained thereby.

Claims

1. A power semiconductor module comprising:

a heat sink having opposed first and second sides;

at least one power semiconductor assembly mounted on each of said first and second sides of said heat sink; and

a plurality of electrically conductive contact laminates extending parallel to the heat sink stacked on top of the power semiconductor assemblies; and

wherein each of the power semiconductor assemblies comprises at least one power semiconductor switch, in particular an IGBT, having a reverse-connected parallel diode connected across said switch, which are fitted to a substrate made of an electrically insulating and thermally conductive material selected from the group consisting of aluminum oxide, aluminum nitride and beryllium oxide.

2. The power semiconductor module as claimed in claim 1, wherein

cathode connections of the diodes of the power semiconductor assemblies, mounted on the first side of the heat sink, are connected to a positive connection of a DC voltage source via a corresponding contact laminate;

anode connections of the diodes of the power semiconductor assemblies, mounted on the second side of the heat sink, are connected to a negative connection of the DC voltage source via a further contact laminate; and

anode connections of the diodes mounted on the first side of the heat sink and cathode connections of diodes mounted on the second side of the heat sink are connected to an AC voltage connection via a further common contact laminate.

3. The power semiconductor module as claimed in claim 2, wherein

conductor tracks for the connections of the power semiconductor switches and the diodes are provided on the substrate;

the cathode connections of the diodes and the connections, corresponding to an anode, of the power semiconductor switches are fitted directly onto the substrate.

4. The power semiconductor module as claimed in claim 3, wherein anode connections of the diodes, control connections, measuring connections, and connections to cathodes of the power semiconductor switches are connected to further conductor tracks which are connected to corresponding contact laminates.

5. The power semiconductor module as claimed in claim 3, wherein anode connections of the diodes, control connections, measuring connections, and connections to cathodes of the power semiconductor switches are connected directly to corresponding contact laminates.

6. The power semiconductor module as claimed in claim 1, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

7. The power semiconductor module as claimed in claim 1, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.

8. The power semiconductor module as claimed in claim 1, wherein the heat sink with the power semiconductor assemblies and the contact laminates is surrounded by a protective casing, the contact laminates being routed as module connections out of the casing.

9. The power semiconductor module as claimed in claim 1, wherein insulating plates are inserted between the contact laminates.

10. The power semiconductor module as claimed in claim 1, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

11. The power semiconductor module as claimed in claim 2, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

12. The power semiconductor module as claimed in claim 3, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

13. The power semiconductor module as claimed in claim 4, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

14. The power semiconductor module as claimed in claim 5, wherein a cooling liquid flows through the heat sink and corresponding cooling liquid connections and cooling channels are provided in the heat sink.

15. The power semiconductor module as claimed in claim 1, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.

16. The power semiconductor module as claimed in claim 2, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.

17. The power semiconductor module as claimed in claim 3, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.

18. The power semiconductor module as claimed in claim 4, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.

19. The power semiconductor module as claimed in claim 5, wherein the contact laminates are composed of a material which has a thermal expansion coefficient matched to that of the heat sink.