DC fan having a power sleep-mode control unit and method for controlling the same
AssigneeWinson Semiconductor Corporation
InventorKuei-wei Kuo
Life of this patent
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Abstract
A DC fan using a power supply and sleep/non-sleep-mode signals for controlling the rotating speed thereof includes a DC brushless motor and a power sleep-mode control unit. The DC brushless motor serves as a driving source of the DC fan. The power sleep-mode control unit is electrically connected to the DC brushless motor for receiving the power supply and the sleep/non-sleep-mode signals, thereby outputting an operating power supply and controlling the rotating speed of the DC brushless motor.
Claims6
The DC (direct current) fan using a power supply and sleep/non-sleep-mode signals for controlling the rotating speed thereof, comprising:
- a DC brush less motor as a driving source of said DC fan;
- a power sleep-mode control unit electrically connected to said DC brushless motor for receiving the power supply and the sleep/non-sleep-mode signals, thereby outputting an operating power supply and controlling the rotating speed of said DC brushless motor;
- a sleep/non-sleep-mode signal generating unit electrically connected to said power sleep-mode control unit for generating the sleep/non-sleep-mode signals;
- and
- firmware for generating time ratio control signals inputted to said sleep/non-sleep-mode signal generating unit, thereby the sleep-mode signals and non-sleep-mode signals are generated alternately for a predetermined period of time by said sleep/non-sleep-mode signal generating unit, and the rotating speed of said DC fan is controlled by a time ratio of the duration of the sleep-mode signals to the duration of the non-sleep-mode signals.
A method for controlling the rotating speed of a DC fan, said DC fan including a DC brushless motor and a power sleep-mode control unit, the method comprising the steps of:
- outputting sleep-mode signals and non-sleep-mode signals from a sleep/non-sleep-mode signal generating unit to said DC brushless motor alternately and continuously;
- and
- controlling the rotating speed of said DC fan by the cooperation of a time ratio of the duration of the sleep-mode signals to the duration of the non-sleep-mode signals and the moment of inertia of said DC fan.
Dependencies are inferred from the claim text.