Power electronic switching device and assembly

Patent metadata

Field	Value
Publication number	US-9530712-B2
Application number	US-201414120385-A
Country	US
Kind code	B2
Filing date	May 14, 2014
Priority date	May 14, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A switching device having a substrate, a power semiconductor component, a connecting device, load connection devices and a pressure device. Substrate has electrically insulated conductor tracks. A power semiconductor component is arranged on a conductor track. Connecting device is formed as a film composite having an electrically conductive film and an electrically insulating film, and has first and second main surfaces. Switching device is connected in an internally circuit-conforming manner by connecting device. The pressure device has a pressure body with a first recess, a pressure element being arranged so that it projects out of the recess, wherein the pressure element presses onto a section of the second main surface of film composite and, in this case, the section is arranged within the surface of the power semiconductor component in projection along the normal direction of the power semiconductor component.

First claim

What is claimed is:

1. A power electronics switching device comprising:
a substrate;
a power semiconductor component disposed on said substrate;
a connecting device;
load connection devices; and
a pressure device;
wherein said substrate has conductor tracks which are electrically insulated from one another, and the power semiconductor component is disposed on one of said conductor tracks and is cohesively connected to said one of said conductor tracks;
wherein said connecting device is formed as a film composite having at least one electrically conductive film and an electrically insulating film, and therefore forms a first and a second main surface;
wherein said switching device is connected in an internally circuit-conforming manner by said connecting device;
wherein said pressure device has a pressure body with a first recess, a pressure element disposed such that it projects out of said recess; and
wherein said pressure element presses onto a section of said second main surface of said film composite and, whereby said section is disposed within said surface of said power semiconductor component in projection along the normal direction of said power semiconductor component;
wherein said first recess in said pressure body is formed as a depression starting from a first main surface of said pressure body with a cutout, which passes through said pressure body to a second main surface of said pressure body, with an opening formed therein;
wherein said pressure element projects out of said cutout in said pressure body at its second main surface.

2. The switching device of claim 1 , wherein said pressure element substantially completely fills said first recess in said pressure body.

3. The switching device of claim 1 , wherein said pressure body is composed of a high-temperature-resistant thermoplastic material and said pressure element is composed of a silicone rubber.

4. The switching device of claim 3 , wherein said pressure body is composed of polyphenylene sulphide, and said pressure element is composed of liquid silicone.

5. The switching device of claim 1
wherein said pressure body has a second recess on its second main surface, the base of said second recess forming an auxiliary surface; and
wherein a flat metal body is disposed in said second recess.

6. The switching device of claim 1 , wherein the surface area of said section of said second main surface is at least about 20% of the surface area of said power semiconductor component.

7. The switching device of claim 6 , wherein the surface area of said section of said second main surface is at least about 50% of the surface area of said power semiconductor component.

8. The switching device of claim 1 , wherein said electrically conductive film of said connecting device includes second conductor tracks having first sections which are cohesively connected both to a contact area of said power semiconductor component and to one of said conductor tracks of said substrate.

9. The switching device of claim 1 , wherein the lateral extent of said pressure device in a direction orthogonal to a direction parallel to the plane of said substrate is smaller than the lateral extent of said substrate.

10. The switching device of claim 1 , wherein the ratio of the lateral extent to vertical extent of said pressure body is at least about 2 to 1.

11. The switching device of claim 10 , wherein the ratio of the lateral extent to vertical extent of said pressure body is at least about 4 to 1.

12. The switching device of claim 1 , wherein the top face of said substrate, including said conductor tracks of said substrate, said power semiconductor component and said connecting device, is encapsulated in a moisture-tight manner by an encapsulation compound.

13. An electronic device comprising:
a power electronics switching device having:
a substrate;
a power semiconductor component disposed on said substrate;
a connecting device;
load connection devices; and
a pressure device;
wherein said substrate has conductor tracks which are electrically insulated from one another, and the power semiconductor component is disposed on one of said conductor tracks and is cohesively connected to said one of said conductor tracks;
wherein said connecting device is formed as a film composite having at least one electrically conductive film and an electrically insulating film, and therefore forms a first and a second main surface;
wherein said switching device is connected in an internally circuit-conforming manner by said connecting device;
wherein said pressure device has a pressure body with a first recess, a pressure element disposed such that it projects out of said recess;
wherein said first recess in said pressure body is formed as a depression starting from a first main surface of said pressure body with a cutout, which passes through said pressure body to a second main surface of said pressure body, with an opening formed therein;
wherein said pressure element projects out of said cutout in said pressure body at its second main surface; and
wherein said pressure element presses onto a section of said second main surface of said film composite and, whereby said section is disposed within said surface of said power semiconductor component in projection along the normal direction of said power semiconductor component;

a cooling device; and
a pressure introduction device;
wherein said pressure introduction device is supported against said cooling device, introduces pressure centrally onto said pressure device whereby said switching device is connected in a force-fitting manner to said cooling device.

14. The device of claim 13 , wherein a thermally conductive paste is disposed between said substrate and said cooling device at a thickness of less than about 20 μm, in particular of less than 10 μm, in particular of less than 5 μm.

15. The device of claim 14 , wherein said thickness of said thermally conductive paste is less than about 10 μm.

16. The device of claim 15 , wherein said thickness of said thermally conductive paste is less than about 5 μm.

17. The device of claim 13 , wherein said cooling device is one of the group consisting of a base plate of a power semiconductor module and a heat sink.

18. The device of claim 13 , wherein the ratio of the lateral extent to the vertical extent of said pressure body is at least about 3 to 1.

19. The device of claim 18 , wherein the ratio of the lateral extent to the vertical extent of said pressure body is at least about 5 to 1.

Assignees

• Semikron Elektronik Gmbh & Co Kg

Inventors

• Göbl Christian

Classifications

• H10W70/688

  Flexible insulating substrates · CPC title

• H10W40/255

  having a laminate or multilayered structure, e.g. direct bond copper [DBC] ceramic substrates · CPC title

• H10W90/00

  Package configurations · CPC title

• H10W74/111

  the semiconductor body being completely enclosed · CPC title

• H10W72/00

  Interconnections or connectors in packages · CPC title