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Piezoelectric Finned Heatsink

IP.com Disclosure Number: IPCOM000240805D
Publication Date: 2015-Mar-04
Document File: 3 page(s) / 75K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described is a method of using the piezoelectric bellow blower concept applied to the plate fins of a heatsink to provide additional cooling capacity to a passive heatsink.

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Piezoelectric Finned Heatsink

A piezoelectric microblower, that uses a piezoelectric diaphragm, which vibrates up and down when a sine wave voltage is applied. The vibrations force air into the microblower and out through a nozzle on the top of the device. Used as an air pump and capable of creating a high air pressure flow, the pump is ideally suited to shorten the duration of high-pressure airflow applications such as an air blower for fuel cells and spot cooling for IC's and electronic circuitry. They are usually much smaller than common air blowing devices, with dimensions of 20 mm by 20 mm and a height of 1.85 mm, and are capable of significant air discharge. Figure 1 below shows common microblower design and actuation motion.

Figure 1

    
Two common methods of forcing airflow through a heatsink; 1) use a system fan to deliver airflow and generate an approach velocity parallel to the fin length orientation, 2) mount a fan on top of the heatsink providing inpegent cooling. The former involves setting and controlling the system fans in direct relation to the component cooling needs. The latter involves providing additional volumetric space for the additional fan. A standard fan sink is considered to be a single point of failure; e.g., if the fan on the heatsink fails, the component will overheat. The microblowers could be fashioned into an array which would provide a level of redundancy if one of the blowers failed. Alternate microblowers could be powered by a separate supply/electrical connection to ward against electrical failure.

    Instead of using individual microblowers, the ceramic diaphragms could be affixed directly to the side of a thin plate fin of a heatsink producing a piezoelectric fin. When affixed to adjacent fins, they can be made to produce directional airflow as does the microblower. The piezoelectric fins can be electrically controlled in such manner to squeeze together faster than when expanding, which allows more air volume to be drawn in from the leading (upstream) edge of the fin. The approaching airflow the leading edge of the fins from the movement of airflow produced by the system assists in filling the space between the fins with more fresh upstream air as the piezoelectric fins expand - as opposed to drawing expelled airflow from the...