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Method of Pressure Detection in Heat Sink Disclosure Number: IPCOM000243863D
Publication Date: 2015-Oct-22
Document File: 2 page(s) / 173K

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Disclosed is a fully integrated method for sensing pressure between the inlet and outlet of a heatsink. Furthermore, the sensor could be tied to a system's thermal management algorithm to determine the flow properties or condition of a heatsink.

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Method of Pressure Detection in Heat Sink

When analyzing in-system CPU heat sink performance, it is generally straightforward to measure power dissipation and temperature in the processor; heat sink inlet temperature is also often simple to measure or estimate. However, once heat sink performance has been calculated, it is difficult to measure the flow rate at which the heat sink achieves this performance. Proposed here is a method of measuring pressure drop across the heat sink, which will allow each heat sink/load arm assembly to measure flow rate through the heat sink. With this apparatus, heat sink performance can be directly tracked in each system being built; this will improve cooling system reliability for shipments to the field.

A heat sink has pressure channels engraved in its base, which connect to further channels within the motherboard/stiffener assembly, which ultimately connect to a pressure sensor that measures differential pressure. Using these measurements, the heat sink's performance may be evaluated on a system-by-system basis by correlating each heat sink's results to known data obtained on a test fixture and/or under controlled conditions. This gives an indication of the heat sink's status, allowing the system to perform protective actions, informational actions, or thermal optimizations to maintain system integrity.

    Two small holes are drilled in a heat sink base: one at the entrance of the fin region, and one at the exit. These holes lead...