Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Reexamination Certificate
2007-03-06
2009-08-11
Benson, Walter (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
C318S471000, C318S400080, C318S634000, C318S641000
Reexamination Certificate
active
07573220
ABSTRACT:
A self-calibrating, continuous variable speed fan for use in cooling electronic circuitry is disclosed. Upon initial power-up, in an environment of known temperature, the self-calibrating fan accommodates for the tolerances of its electronic components by reading a voltage from its thermistor array and comparing the actual value to an expected value for the given temperature. The difference is then stored in the non-volatile memory of a microcontroller for use in adjusting future voltage readings from the thermistor array. During normal operation, adjusted readings from the thermistor array are then converted by the microcontroller into a control signal for driving the motor of a cooling fan. A quickly cycling stochastic process between adjustments to fan motor speed and temperature readings is then established, thereby maintaining a high degree of control over the device to be cooled.
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International Preliminary Report on Patentability/ Written Opinion for PCT Application No. PCT/US2005/014618, filed Apr. 25, 2007, dated Sep. 27, 2007, 12 pages total.
Frankel Scott
Hardt Eric A.
Benson Walter
McCloud Renata
Minebea Co. Ltd.
Townsend and Townsend / and Crew LLP
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