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Power-Less Temperature Monitored Air Moving Device

IP.com Disclosure Number: IPCOM000112294D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Nakanishi, T: AUTHOR

Abstract

Disclosed is an Air Moving Device (AMD) for cooling a small size computer like LAPTOP or NOTEBOOK computer. This AMD does not need an external electric power source heretofore used for driving its motor, by the conversion from heat dissipation to electricity energy. As a result, it is possible to change the rotation speed in proportion to the quantity of its heat radiation to be cooled without the use of a thermistor.

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Power-Less Temperature Monitored Air Moving Device

      Disclosed is an Air Moving Device (AMD) for cooling a small
size computer like LAPTOP or NOTEBOOK computer.  This AMD does not
need an external electric power source heretofore used for driving
its motor, by the conversion from heat dissipation to electricity
energy.  As a result, it is possible to change the rotation speed in
proportion to the quantity of its heat radiation to be cooled without
the use of a thermistor.

      The Figure shows an example of this device.  Small size
computer (1) needs a reduction in size and electric dissipation.  It
is highly desirable if forced cooling can be achieved without
battery.  In this scheme, heat energy radiated from a module device
like CPU module chip and converter (3) on card (2), which has to be
cooled, is converted to electrical energy (6) by thermo-electric
device (4) utilizing Seebeck effect.  AMD (5) uses this electrical
energy (6) to cool the device (3) without any external power supply.
When the device (3) is cooled down well, the electrical energy (6)
decreases.  Therefore, the rotation of the AMD (5) decreases
proportionally and linearly, then finally stops.  When the heat
radiation from the device (3) increases and reaches a threshold for
cooling, the AMD (5) rotates again by the electrical energy (6).
Thus, the AMD monitors the temperature of the device without the use
of a thermistor.

The utilization of the electrical energy (6) by Seebeck eff...