Browse Prior Art Database

Air-Cooled Circuit Package With Fins Interfitting Between Closely Spaced Circuit Boards

IP.com Disclosure Number: IPCOM000034900D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Myers, VH: AUTHOR

Abstract

In some circuit packages, a circuit board carries wiring to a series of electrical connectors, and circuit cards are plugged into the connectors. The package will be described with the board arbitrarily oriented in a horizontal plane and the cards on the upper surface. The cards are spaced apart on the board, parallel to each other and extending upward from the board. The cards carry components on both sides, and a thin flat metal cap is mounted on each side to enclose the components. The components produce heat which is transferred to the metal cap by conduction or convection and the cap is cooled by air. For improved cooling, a finned metal plate is attached to the outer flat surface of each cap. The plate is as wide as the cap and extends above the upper edge of the card for a suitable distance.

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Air-Cooled Circuit Package With Fins Interfitting Between Closely Spaced Circuit Boards

In some circuit packages, a circuit board carries wiring to a series of electrical connectors, and circuit cards are plugged into the connectors. The package will be described with the board arbitrarily oriented in a horizontal plane and the cards on the upper surface. The cards are spaced apart on the board, parallel to each other and extending upward from the board. The cards carry components on both sides, and a thin flat metal cap is mounted on each side to enclose the components. The components produce heat which is transferred to the metal cap by conduction or convection and the cap is cooled by air. For improved cooling, a finned metal plate is attached to the outer flat surface of each cap. The plate is as wide as the cap and extends above the upper edge of the card for a suitable distance. The two plates are connected at the top to provide a spring action that holds the plates in thermal contact with the two caps. Air is blown horizontally through the card assembly, parallel to the cards and the plates. Rectangular fins extend horizontally from the plates. The fins are attached to the outer surface of the plate along its entire length and are attached to the inner surface of the plate in the region above the cap. The fins on the inner surfaces of the plates extend to about the mid-plane of the card so that their edges are slightly separated. The fins on the outer surf...