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Power supply apparatus

  • US 5,825,642 A
  • Filed: 05/27/1997
  • Issued: 10/20/1998
  • Est. Priority Date: 11/08/1996
  • Status: Expired due to Term
First Claim
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1. A power supply apparatus comprising a housing, a component which generates heat when operating, said component being disposed in said housing, and a fan disposed in said housing for cooling said heat-generating component, wherein said power supply apparatus further comprises:

  • a driving unit for driving said fan;

    a temperature detector for providing a temperature representative signal representing the temperature in said housing;

    means for calculating the difference between the value of said temperature representative signal and a predetermined reference value; and

    control signal generating means for generating a control signal causing said driving unit to apply to said fan a driving voltage for setting the rotation speed of said fan to zero during a time period when said difference indicates that the value of said temperature representative signal is smaller than said reference value, and generating a control signal causing said driving unit to apply to said fan a driving voltage which causes said fan to rotate at a substantially maximum rotation speed for only a predetermined time period in an initial portion of the time period when said difference indicates that the value of said temperature representative signal is equal to or greater than said reference value and then causes said fan to rotate at a rotation speed which is determined in accordance with said difference.

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