Fan circuit with a fan speed control circuit
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United States of America Patent
Stats
-
Mar 23, 2010
Grant Date -
Oct 23, 2008
app pub date -
Jul 23, 2007
filing date -
Apr 20, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fan speed control circuit is used for controlling rotation speed of a fan. The fan speed control circuit receives a pulse width modulation (PWM) signal from a system and comprises a programmable control unit and a current control unit. The programmable control unit receives the PWM signal, is connected to a Hall element for receiving a voltage signal therefrom, and provides a control signal. The current control unit takes the control signal to control current flowing through a stator coil unit of the fan so as to control the speed of the fan. The programmable control unit has a program written for the PWM signal, and when the fan speed control circuit is used in another system with a different PWM signal, the programmable control unit can be given a new program for the different PWM signal for controlling the speed of the fan.
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