Rotation speed control device for a heat-dissipating fan
AssigneeNS Micro Motor Technology Corp.
InventorTa-Lun KO
Life of this patent
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Abstract
A rotation speed control device for a heat-dissipating fan includes an impedance unit, a regulating unit, and a driving circuit. The impedance unit includes a first resistor having a first end connected to a first node, and a second end connected to a second node, and a second resistor having a third end connected to the second node, and a fourth end. The regulating unit is connected to the impedance unit and is configurable for varying an effective impedance of the impedance unit to adjust magnitude of current flowing through the impedance unit. The driving circuit is connected to the impedance unit and is adapted to control rotation speed of the heat-dissipating fan according to the magnitude of the current flowing through the impedance unit.
Claims13
A rotation speed control device for a heat-dissipating fan, comprising:
- an impedance unit including
- a first resistor having a first end connected to a first node, and a second end connected to a second node, and
- a second resistor having a third end connected to said second node, and a fourth end;
- a regulating unit connected to said impedance unit and configurable for varying an effective impedance of said impedance unit to adjust magnitude of current flowing through said impedance unit;
- and
- a driving circuit connected to said impedance unit and adapted to control rotation speed of the heat-dissipating fan according to the magnitude of the current flowing through said impedance unit.
Dependencies are inferred from the claim text.