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Disclosed is a design concept of an air-cooled heatsink with an improved thermal efficiency when compared with conventional designs.
English (United States)
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Enhanced Air-Cooled Heatsink
Disclosed is a design concept of an air-cooled heatsink with an improved
thermal efficiency when compared with conventional designs.
Conventional designs are extruded; however, when fin thickness and height
exceed the limitations of the process, designers resort to stacking fins 3 parallel
to each other with spacers 4 placed between each fin. They are then fixtured
and brazed. The cooling medium, usually air, is forced through the gap between
the fins. See Figure 1.
Figure 2 shows the elements of the enhanced design. The fins 5 are slotted 6
to provide a path for the air flow and stacked to form a solid laminate with the
slots in register with each other so as to form a continuous air path. Joining of
the stacked fins can be either brazed, riveted or welded. A combination of the
riveted and welded design would be most effective and less costly.
The improved thermal efficiency is due to the fact that all the fins are in direct
contact with the heat generating device 7, whereas in the conventional design,
heat conducted to the spacers 4 must travel through the brazed interface in order
to contribute thermally to the fins 3. The brazed interface has a higher thermal
resistance than the fin.
The advantages of this design are:
. improved thermal efficiency
. fewer details to assemble
. slot size can be varied to meet thermal efficiency
. improved manufacturability