Patents Represented by Attorney Muncy, Geissler, Olds & Lowe, PPLC
  • Patent number: 7841837
    Abstract: The present invention discloses a cooling-fan rotation-speed control circuit, wherein a plurality of sets of input power sources respectively having different voltages is electrically and parallel coupled to a cooling fan; a switch is installed between at least one input power source and the cooling fan; the switch is turned on/off according to a rotation-speed parameter to determine whether the cooling fan is driven by a low-voltage driving power or a high-voltage driving power.
    Type: Grant
    Filed: August 17, 2006
    Date of Patent: November 30, 2010
    Assignee: Zippy Technology Corp.
    Inventor: Tsung-Chun Chen