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Device and method for automatically controlling rotating speed of fan cooler

  • US 6,182,902 B1
  • Filed: 07/22/1999
  • Issued: 02/06/2001
  • Est. Priority Date: 07/23/1998
  • Status: Expired due to Term
First Claim
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1. A device for controlling a rotational speed of a fan cooler attached to an apparatus, the device comprising:

  • a plurality of control-voltage generators, each of which having a sensing means for sensing a local temperature and generating a local control voltage corresponding to the local temperature;

    a weighted circuit comprising a plurality of resisters, each of the resisters comprising a weighting coefficient wherein the weighted circuit generates a weighted control voltage by a summation of the local control voltages multiplied by the respective weighting coefficients;

    a pulse modulator for modulating a clock signal responsive to the control voltage into a pulse modulation signal; and

    a fan driver for controlling the rotational speed of the fan cooler in response to the pulse modulation signal.

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