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A Method for Temperature Control in Portable Electronic Equipment

IP.com Disclosure Number: IPCOM000041030D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Myers, W: AUTHOR

Abstract

The method described controls the internal air temperature in portable electronic equipment. The method dissipates little extra power, and is very accurate.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 73% of the total text.

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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 accurate.

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 cooling.

Referring to Fig. 2, t...