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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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The method described controls the internal air temperature in portable electronic equipment. The method dissipates little extra power, and is very accurate.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
73% of the total text.
Page 1 of 1
A Method for Temperature Control in Portable Electronic Equipment
The method described controls the internal air temperature in portable
electronic equipment. The method dissipates little extra power, and is very
The desired results are achieved by making use of the heat dissipated in the
piece of equipment, which is circulated by an internal fan for even thermal
distribution, to raise the box temperature above the room temperature. Another
fan, controlled by temperature-sensing circuitry in the box, brings in cooler air
from the room as needed to keep the internal temperature constant.
Referring to Fig. 1, the circulating fan is positioned in the box so that all
temperature sensitive and heat generating components have plenty of air flow.
This ensures an even tempera- ture mix through the box and effective
temperature control for sensitive components. The cooling fan duct and air duct
must be close together so that there is a minimum pressure differential between
them. Any such pressure difference causes circulating air to flow outside the box
even when the cooling fan is stopped, cooling inside air and reducing the
maximum box tempera- ture rise available. Creating air flow control passages
either internal or external to the box can allow close spacing of the ducts inside,
as desired, and greater spacing outside, which reduces external flow between
the ducts and allows a smaller minimum box temperature rise with maximum