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US 7,804,222 B2Granted
Method of optimizing drive frequency for piezo fan device
AssigneeDell Products L.P.
InventorCharles D. Hood
Life of this patent
Estimating the term…
Abstract
For tuning a piezo electric fan, a controller measures a natural frequency of the piezo electric fan by applying a stress and measuring a response to the stress. A frequency of an alternating current (AC) input signal is adjusted by the controller to substantially match the natural frequency. The adjusted AC input having the natural frequency is provided to the piezo electric fan for improved efficiency.
Claims18
A controller for controlling a piezo electric fan, the controller comprising:
- a resonant frequency circuit to measure a natural frequency of the piezo electric fan in response to a stress applied to the piezo electric fan;
- a control logic, wherein the control logic adjusts a frequency of an alternating current (AC) input signal to substantially match the natural frequency;
- and
- a switch operable to be selectively placed in one of a first position and a second position, wherein when placed in the first position the piezo electric fan is electrically coupled to the resonant frequency circuit and wherein when placed in the second position the piezo electric fan is electrically coupled to the control logic.
1 more element
A method of tuning a piezo electric fan, the method comprising:
- measuring a natural frequency of the piezo electric fan, wherein the measuring includes:
- placing a switch in a first position such that a stress is applied to the piezo electric fan;
- after a period of time, removing the switch from the first position and placing the switch in a second position such that the stress is removed;
- and
- measuring an electrical output while the switch is in the second position;
- adjusting a frequency of an alternating current (AC) input signal to substantially match the natural frequency;
- and
- providing the alternating current (AC) input signal having the natural frequency to the piezo electric fan.
5 more elements
An information handling system (IHS) comprising:
- a printed circuit board having a plurality of electronic components;
- a piezo electric fan operable for removal of heat generated by the plurality of electronic components;
- a controller for controlling the piezo electric fan, wherein the controller, the plurality of electronic components, and the piezo electric fan are powered by an alternating current (AC) input signal having a variable frequency, wherein the controller includes:
- a resonant frequency circuit to measure a natural frequency of the piezo electric fan in response to a stress applied to the piezo electric fan;
- and
- a control logic, wherein the control logic adjusts a frequency of an alternating current (AC) input signal to substantially match the natural frequency;
- and
- a switch operable to be selectively placed in one of a first position and a second position, wherein when placed in the first position the piezo electric fan is electrically coupled to the resonant frequency circuit and wherein when placed in the second position the piezo electric fan is electrically coupled to the control logic.
5 more elements
Dependencies are inferred from the claim text.