System and method for monitoring speed signals from multiple fans
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United States of America Patent
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Issued Date -
Jun 12, 2008
app pub date -
Apr 18, 2007
filing date -
Dec 8, 2006
priority date (Note) -
Abandoned
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Abstract
A system and method is provided for monitoring the speed signals of a first fan and a second fan. The system includes a selection signal generation device, a logic gate, a counter and a control device. The selection signal generation device outputs a selection signal to the logic gate having two different states. Based upon the speed signals and the state of the selection signal, the logic gate outputs an output speed signal representing the speed signal of the first fan or second fan to the counter. The counter converts the output speed signal to a digital speed datum. The control device calculates the speed of the first fan or the second fan according to the selection signal and the digital speed datum. The changes of state of the selection signal permit the system to obtain the respective speeds of the two fans in different access cycles.
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