Static converter module with mounting lugs

• US 4,636,580 A
• Filed: 11/08/1985
• Issued: 01/13/1987
• Est. Priority Date: 03/04/1983
• Status: Expired due to Term

• Current Assignee: IXYS Corporation (Littelfuse Incorporated)
• Original Assignee: Brown Boveri & CIE AG (ABB Limited)
• Inventors: Leukel, Bernd, Neidig, Arno, Hettmann, Hubert
• Primary Examiner(s): Tolin, G. P.
• Application Number:
  US06/800,082
• Time in Patent Office: 431 Days
• Field of Search: 361/386-388, 361/395, 361/399, 361/417, 361/419, 361/420, 361/426, 361/427, 361/377, 174/52 PE, 174/16 HS, 174/138 G, 174/DIG. 2, 357/81, 363/141
• US Class Current: 174/548
• CPC Class Codes: H01L 2023/4087 Mounting accessories, interposers, clamping or screwing parts
• CPC Class Codes: H01L 23/32 Holders for supporting the complete device in operation, i.e. detachable fixtures H01L23/40 takes precedence
• CPC Class Codes: H01L 23/4006 with bolts or screws
• 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

Abstract

In this static converter module, which is equipped with thyristors, diodes or power transistors, mounting lugs (4,11) having mounting holes (5,6,12,13) are used for mounting the module on a heat sink. The housing of the module is essentially formed by a frame (1,10) which is open at the top and at the bottom and by a ceramic plate which is inserted into the base part of the frame. For the purpose of fixing the ceramic plate in place, a peripheral indentation (7,15) is provided in the base part of the frame. In order to prevent mechanical stresses in the area of the mounting holes/mounting lugs from being transmitted to the ceramic plate, slits (9) are provided between the frame walls and the mounting holes. As an alternative to this, the peripheral indentation (15) can be provided with steps in such a manner that in the area of the two frame walls provided with the mounting lugs (11) a slot-shaped recess (16) is produced between the ceramic plate and the peripheral indentation (15).

Claims

1. A module for a static converter, comprising a housing including:

a top part in the form of a frame being open at the bottom and top defining lateral surfaces, a lower edge and an interior, and mounting lugs formed on said lateral surfaces at a given height, said mounting lugs having mounting holes formed therein for receiving means for mounting the module on a heat sink; and

a bottom part in the form of a ceramic plate having a lower surface disposed entirely on the heat sink when mounted, said ceramic plate being at least partially disposed in a peripheral indentation formed in said lower edge in said interior of said frame substantially at said given height; and

means for preventing a mechanical stress field from being transmitted directly from the mounting means to said ceramic plate when mounted, said transmission prevention means being in the form of slits separate from said peripheral indentation and said mounting holes, each of said slits being formed in a respective one of said mounting lugs substantially parallel to a respective one of said lateral surfaces between a respective one of said lateral surfaces and a respective one of said mounting holes.

2. A module for a static converter, comprising a housing including:

a top part in the form of a frame having sides and being open at the bottom and top defining lateral surfaces, a lower surface with a lower edge and an interior, and two mounting lugs formed on said lateral surfaces at opposite sides of said frame at a given height, said mounting lugs having a lower surface and having mounting holes formed therein for receiving means for mounting the module on a heat sink; and

a bottom part in the form of a ceramic plate having a lower surface disposed entirely on the heat sink when mounted and an upper surface facing said interior of said frame, said ceramic plate being at least partially disposed in a peripheral indentation formed in said lower edge of said frame at said lower surface of said mounting lugs facing said interior of said frame substantially at said given height, said peripheral indentation being perpendicular to said upper surface of said ceramic plate defining an upper surface of said peripheral indentation; and

means for preventing a mechanical stress field from being transmitted directly from the mounting means to said ceramic plate when mounted, said transmission prevention means being in the form of a recess formed in said lower surface of said frame separate from said mounting holes and said peripheral indentation between said upper surface of said ceramic plate and said upper surface of said peripheral indentation.

3. A module according to claim 2, wherein said recess defines a space between said upper surface of said ceramic plate and said frame.