Browse Prior Art Database

CAST/EXTRUDED HEATSINK WITH ADDED COOLING PLATES

IP.com Disclosure Number: IPCOM000008710D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-04
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Bob Widmayer: AUTHOR

Abstract

Heatsink performance in two way radios has continued to become more critical as product size decreases and performance requirements increase. Typically, very expensive heatsink fabrication methods or changes to alternate cooling technolo- gies have been required in order to provide the needed thermal performance. Preferred, low cost technologies include free and forced convection using a die cast or extruded heatsink. Expensive technologies include bonded fin heatsinks, heat pipes, closed refrigeration systems, air conditioning, etc.

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Technical Developments

CAST/EXTRUDED HEATSINK WITH ADDED COOLING PLATES

by Bob Widmayer

BACKGROUND

  Heatsink performance in two way radios has continued to become more critical as product size decreases and performance requirements increase. Typically, very expensive heatsink fabrication methods or changes to alternate cooling technolo- gies have been required in order to provide the needed thermal performance. Preferred, low cost technologies include free and forced convection using a die cast or extruded heatsink. Expensive technologies include bonded fin heatsinks, heat pipes, closed refrigeration systems, air conditioning, etc.

PROBLEM

  Due to the decreasing size and increasing performance requirements of two way radios, it is becoming necessary to change to new, very expensive cooling technologies. This switch is not desirable as it has severe cost penalties. It also creates other problems such as environmental issues, site / retrofit compatability, additional mechanical subsystems, additional mechanical

restrictions, customer perception, etc. The need exists to get increased thermal performance from traditional heatsink technologies and form factors at reasonable costs.

SOLUTION

  This invention involves a technique to greatly increase the convective surface area of a die cast or extruded heatsink, allowing improved thermal convection from the heatsink. In this invention, conductive plates are placed down over the tins and a high quality thermal interface is created at the junction between th...