Snap-lock heat sink clip

• US 5,909,358 A
• Filed: 11/26/1997
• Issued: 06/01/1999
• Est. Priority Date: 11/26/1997
• Status: Expired due to Fees

• Current Assignee: Distributed Power, Inc. (China National Appliance of North America Corp.)
• Original Assignee: Todd Engineering Sales, Inc.
• Inventors: Bradt, Douglas H.
• Primary Examiner(s): THOMPSON, GREGORY D
• Application Number:
  US08/980,500
• Time in Patent Office: 552 Days
• Field of Search: 257/718-719, 361/688, 361/690, 361/704, 361/707, 361/709-710, 361/715-722
• US Class Current: 361/707
• CPC Class Codes: H01L 23/4093 Snap-on arrangements, e.g. clips
• 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

The present invention involves a heat sink clip which engages a slot of a heat sink to press a power component into a heat sink of an electronic module, such as a power converter circuit for a vehicle. A power converter module for a vehicle comprises a casing having at least one heat sink with a plurality of fins, power converter circuitry disposed within the casing and including at least one power component; and a clip for pressing the power component into the heat sink. The clip has a first end engaging a slot of the casing and a second end extending from the first end with a resilient biasing that presses the power component into thermal contact with the heat sink. The casing slot includes a lip which retains the clip within the slot, and a sloped surface which facilitates entry of the clip. The clip has a generally L-shaped configuration for engaging the slot, with a corner that abuts a lip of the casing slot to retain the corner within the slot. The clip also includes an end flange for engaging the slot in an interference fit. A thermally conductive, electrically insulating layer is disposed between the power component and the heat sink, and the clip includes an articulated portion extending beyond said power component so that only the clip second end contacts the power component. The clip is made of a metallic material.

Claims

1. An electronic module comprising:

a heat sink disposed in said electronic module, said heat sink having a contact surface and a slot located above said contact surface;

circuitry disposed within said electronic module, said circuitry including at least one heat generating power component which generates heat during operation, said at least one heat generating power component disposed proximate said contact surface and below said slot; and

a clip pressing said heat generating power component into said heat sink, said clip having first end engaging said slot, said clip having a second end extending from said first end;

said second end having a resilient biasing that presses said heat generating power component into thermal contact with said heat sink contact surface, said clip having a corner connecting said first end and said second end;

said first end and said slot being structured and arranged to allow said first end to extend and slide into said slot, said slot having a lip which extends proximate an opening of said slot, said first end having a length which allows said corner to abut said lip and inhibit movement of said first end out of said slot whereby said clip engages said slot and said lip retains said first end within said slot.

2. The electronic module of claim 1 wherein said clip has a generally L-shaped configuration for engaging said slot.

3. The electronic module of claim 1 wherein said clip includes a flared portion for engaging said slot in an interference fit.

4. The electronic module of claim 1 further comprising a thermally conductive, electrically insulating layer disposed between said power component and said heat sink.

5. The electronic module of claim 1 wherein said clip includes an articulated portion between said first and second ends, said articulated portion extending beyond said power component so that only said second end contacts said power component.

6. The electronic module of claim 1 wherein said clip is made of a metallic material having spring biasing properties.

7. The electronic module of claim 1 wherein said slot includes a sloped surface which facilitates the entry of said clip.

8. An electronic module for a vehicle comprising:

a casing having at least one heat sink with a plurality of fins, said heat sink defining a wall, said wall having a contact surface and a slot located in said wall and above said contact surface;

power converter circuitry disposed within said casing, said power converter circuitry including at least one power component which produces heat as a result of operation, said at least one power component disposed proximate said contact surface and below said slot; and

means for clamping said power component into said wall contact surface of said heat sink, said clamping means engaging said slot and pressing said power component into thermal contact with said heat sink wall contact surface;

said clamping means and said slot being structured and arranged to allow an engaging portion of said clamping means to extend and slide into said slot, said slot having a lip which extends proximate an opening of said slot, said engaging portion having a length which extends to an abutment portion and which allows said abutment portion to abut said lip and inhibit movement of said engaging portion out of said slot whereby said clamping means engages said slot and said lip retains said engaging portion within said slot.

9. The electronic module of claim 8 wherein said clamping means includes a generally L-shaped body with a engaging portion of said L-shaped body engaging said slot.

10. The electronic module of claim 9 wherein said L-shaped body includes an articulated portion distinct from said engaging portion, said articulated portion extending outside said slot and beyond said power component so that only one end of said L-shaped body contacts said power component.

11. The electronic module of claim 9 wherein said L-shaped body includes a corner and said slot of said casing includes a lip which retains said corner within said slot.

12. The electronic module of claim 11 wherein said clamping means includes a body having a flared portion for engaging said slot in an interference fit.

13. The electronic module of claim 8 further comprising a thermally conductive, electrically insulating layer disposed between said power component and said heat sink.

14. The electronic module of claim 8 wherein said clamping means is made of a metallic material.

15. The electronic module of claim 8 wherein said slot includes a sloped surface which facilitates the entry of said clamping means.

16. A power converter module for a vehicle comprising:

a casing, said casing including a heat sink including a plurality of fins, said heat sink defining a wall, said wall having a contact surface and a slot located in said wall above said contact surface,

circuitry disposed within said casing, said circuitry capable of performing power amplification or transformation, said circuitry including at least one heat generating component which generates heat during operation, said at least one heat generating component disposed proximate said contact surface and below said slot; and

clamping means for clamping said heat generating component into said wall contact surface of said heat sink, said clamping means engaging said slot and pressing said heat generating component into thermal contact with said heat sink wall contact surface;

said clamping means and said slot being structured and arranged to allow an engaging portion of said clamping means to extend and slide into said slot, said slot having a lip which extends proximate an opening of said slot, said engaging portion having a length which extends to an abutment portion and which allows said abutment portion to abut said lip and inhibit movement of said engaging portion out of said slot whereby said clamping means engages said slot and said lip retains said engaging portion within said slot.

17. The power converter module of claim 16 wherein said clamping means includes a clip, said clip having a first end engaging a slot of said module, said clip having a second end extending from said first end;

said second end having a resilient biasing that presses said power component into thermal contact with said heat sink.

18. A method of installing a heat sink clip to press an electrical component into a heat dissipating device, comprising the steps of:

providing a heat sink with a contact surface and a slot located above the contact surface, the slot having a lip which extends proximate an opening of the slot;

providing a clip with a first end adapted to engage the slot, a second end extending from the first end with a resilient biasing that is adapted to press the electrical component into thermal contact with the heat sink contact surface, and a corner connecting the first and second ends;

inserting the first end into the slot;

pressing the first end until the corner abuts the lip and inhibits movement of the first end out of the slot whereby the clip engages the slot and the lip retains the first end within the slot.