Fan control circuit

Details Fan control circuit Fan control circuit

2008-08-08

2011-11-01

Masih, Karen (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S400210, C318S400230

Reexamination Certificate

active

08049450

ABSTRACT:
A fan control circuit for controlling a fan to dissipate heat from an electrical device includes a comparator and an electrical switch. The comparator has a comparator input terminal, a comparator reference terminal, and a comparator output terminal. The comparator input terminal is connected to a power source via a first resistor and is also connected to the electrical device to receive a working current draw of the electrical device. The comparator reference terminal is receiving a reference voltage. The comparator output terminal is capable of outputting a comparison result between a voltage received by the input terminal and the reference voltage. The electrical switch has a control terminal, a first terminal, and a second terminal. The control terminal is connected to the comparator output terminal of the comparator to receive the comparison result. The first terminal is connected to the power source via a resistor. The second terminal is grounded and connected to the terminal via a fan.

REFERENCES:
patent: 5457766 (1995-10-01), Ko
patent: 6954354 (2005-10-01), Shyr
patent: 2003/0001531 (2003-01-01), Xi
patent: 2005/0047762 (2005-03-01), Liu et al.
patent: 1601422 (2005-03-01), None

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