Radiator fan driving module applied to a power system or a power supply device
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United States of America Patent
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N/A
Issued Date -
Feb 17, 2005
app pub date -
Aug 14, 2003
filing date -
Aug 14, 2003
priority date (Note) -
Abandoned
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Abstract
A radiator fan driving module applied to a power system/power supply device is configured as a single unit on which a fan driving circuit is designed, whereby the amount of the radiator fans is easy to be varied based on requirements of the power system. The fan driving circuit controlled by a PWM circuit applies a DC voltage to the radiator fan whereby the radiator fan is driven at a PWM voltage with a non-zero low level voltage, thus the driving current to the radiator fan is smooth and the lifetime of the radiator fan is prolonged because stress that the radiator fan bearing bear is minimized. The PWM circuit further addresses temperature and load condition to improve the operation efficiency of the radiator fan by speeding up while temperature is too high, and slowing down while the load that the power system experiences is light.
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