US 2001/0024615 A1Published application

Control circuit for a heat-dissipation fan

AssigneeYen Sun Technology Corp.

InventorChien-Jung Chen

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Abstract

A control circuit for controlling the rotational speed of a heat-dissipation fan for an electronic device, the circuit including a temperature sensing circuit for sensing the ambient temperature of the device and providing a temperature signal, a comparator circuit for receiving the temperature signal and for comparing it with a predetermined threshold, and a drive circuit for receiving the comparison signal and for controlling the rotational speed of the fan so that, when the ambient temperature is above the threshold, the speed changes substantially linearly with respect to the difference between the ambient temperature and the threshold and, when the ambient temperature is below the threshold, the fan is stopped.

Claims4

Dependent claims

A control circuit for controlling the rotational speed of a heat-dissipation fan for an electronic device, said fan having a permanent magnet and a coil means, said control circuit comprising:

a temperature sensing circuit for sensing the ambient temperature of the device and providing a temperature signal related thereto;
a comparator circuit for receiving said temperature signal and for comparing said temperature signal with a predetermined threshold and providing a comparison signal related thereto;
a circuit for detecting the phase of the fan magnet and for providing a phase signal related thereto;
a drive circuit for receiving said phase signal and said comparison signal and for driving said coil means to control the rotational speed of said fan, when the ambient temperature is above said threshold, to change substantially linearly with respect to the difference between the ambient temperature and the threshold and, when the ambient temperature is below said threshold, to stop the rotation of the fan.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/842,639Filed 27 Apr 2001
Priority: 28 Jan 2000
Published: 27 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F04D 27/004
Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids: by varying driving speed
Y02B 30/70
Energy efficient heating, ventilation or air conditioning [HVAC]: efficient control or regulation technologies, e.g. for control of refrigerant…
F04D
Non-positive-displacement pumps
Y02B
Energy-efficient buildings

Family

Application09/493,617Continuation in part · filed 28 Jan 2000
Application09/842,639Continuation in part · filed 27 Apr 2001
US 6,499,960 B2Related patent
US 2001/0024615 A1This patent

From the US filing history. Foreign family members aren’t listed.

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