Circuit for controlling rotation speed of computer fan

Details Circuit for controlling rotation speed of computer fan Circuit for controlling rotation speed of computer fan

2008-01-30

2010-06-22

Ip, Paul (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C388S825000, C318S268000, C318S434000, C361S310000, C062S126000, C062S181000

Reexamination Certificate

active

07742688

ABSTRACT:
A circuit for controlling rotation speed of a computer fan includes a fan connector providing for controlling the rotation speed of the computer fan, a rotation speed detector providing for detecting the rotation speed of the computer fan, a BIOS chip connected to the fan connector via the rotation speed detector and provided for receiving, and comparing rotation speed signals from the rotation speed detector, a super I/O chip connected to the BIOS chip and provided for outputting either a PWM signal or another PWM signal to be converted to a voltage signal to control rotation speed of the computer fan according to the result of the comparison, a integrated circuit connected to the super I/O chip and the fan connector and configured for converting the another PWM signal to an analog voltage signal.

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