Embodiments of the present invention relate to heat management and more particularly to heat management using thermal conductors.
Thermal management can be critical in many applications. Excessive heat can cause damage to or degrade the performance of mechanical, chemical, electric, and other types of devices. Heat management becomes more critical as technology advances and newer devices continue to become smaller and more complex, and as a result run hotter.
Modern electronic circuits, because of their high density and small size, often generate a substantial amount of heat. Complex integrated circuits (ICs), especially microprocessors, generate so much heat that they are often unable to operate without some sort of cooling system. Further, even if an IC is able to operate, excess heat can degrade an IC's performance and can adversely affect its reliability over time. Inadequate cooling can cause problems in central processing units (CPUs) used in personal computers (PCs), which can result in system crashes, lockups, surprise reboots, and other errors. The risk of such problems can become especially acute in the tight confines found inside laptop computers and other portable computing and electronic devices.
Prior methods for dealing with such cooling problems have included using heat sinks, fans, and combinations of heat sinks and fans attached to ICs and other circuitry in order to cool them. However, in many applications, including portable and handheld computers, computers with powerful processors, and other devices that are small or have limited space, these methods may provide inadequate cooling.
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Both options have limitations. Option 1 is often more attractive for thin systems, although it is prone to irregular surface contact between the HP and the block due to the flattening fabrication process, thereby causing high thermal solution performance variance in especially in high volume manufacturing. Although option 2 provides more consistent performance, it is marred for thin systems due to its increased vertical height relative to option 1.
Embodiments of a heat pipe having a radial shape to be fitted around a perimeter edge of a thermally conductive member, are disclosed. In the following description, numerous specific details are set forth. However, it is understood that embodiments may be practiced without these specific details. In other instances, well-known circuits, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.
Reference throughout this specification to “one embodiment” or “an embodiment” indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In one embodiment, as illustrated in
In an alternative embodiment, the heat pipe has a shape other than a radial shape. For example, the heat pipe in alternative embodiments may have a shape of an elliptical, square, rectangle, or other shapes, and be fitted around a thermally conductive member having a corresponding shape. Furthermore, the diameter of the thermally conductive block and heat pipe may vary in different embodiments.
The thermally conductive member is placed in contact with a surface of a heat generating device (e.g., a central processing unit (CPU), a graphics processor, a chip set, a memory controller, or other circuits). The thermally conductive member absorbs at least part of the heat generated by the heat generating device. The heat absorbed by the thermally conductive member is then absorbed by the heat pipe in contact with the thermally conductive member. Heat absorbed by the heat pipe is then transferred to an opposite end of the heat pipe, where the heat may be dissipated by the use of a heat exchanger (one embodiment of which is described in more detail below).
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As discussed above, in one embodiment, an end of the heat pipe, opposite an end in contact with the thermally conductive member, may terminate at a heat exchanger or heat sink. In one embodiment, as illustrated in
In one embodiment, the heat sink includes a plurality of fins. The fins are spaced apart to allow ambient air from outside the computing device to naturally flow across the fins of the heat sink to dissipate the heat resident in the fins, which had been transferred from the heat generating device. In one embodiment, each fin of the heat sink is 16 mm in height, 6 mm in width, and 2 mm in depth. In one embodiment, the space between each pair of fins is 1.5 mm. In an alternative embodiment, alternative heat sink and heat exchangers may be used.
These embodiments have been described with reference to specific exemplary embodiments thereof. It will, however, be evident to persons having the benefit of this disclosure that various modifications and changes may be made to these embodiments without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.