Fan speed controller
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United States of America Patent
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Jan 20, 2009
Grant Date -
N/A
app pub date -
Feb 24, 2004
filing date -
Feb 24, 2004
priority date (Note) -
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Abstract
Embodiments of the present invention provide a low noise and high efficiency fan speed controller. The fan speed controller generates a pulse width modulation signal. The pulse width modulation signal is utilized to switch mode convert a supply voltage into a linear voltage. The voltage level of the linear voltage is a function of the pulse width modulation signal. The linear voltage is utilized to control the operating speed of a direct current fan.
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