SYNCHRONIZING METHOD OF FAN ROTATIONAL SPEED
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United States of America Patent
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Issued Date -
Sep 17, 2015
app pub date -
Mar 11, 2014
filing date -
Mar 11, 2014
priority date (Note) -
Abandoned
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Abstract
A synchronizing method of fan rotational speed includes steps of: using a first Hall sensor to detect pulse period width generated by the rotational speed of the first fan and converting the pulse period width into a first pulse signal and transmitting the first pulse signal to a microprocessor; using a second Hall sensor to detect pulse period width generated by the rotational speed of the second fan and converting the pulse period width into a second pulse signal and transmitting the second pulse signal to the microprocessor; using the microprocessor to compare the first and second pulse signals corresponding to the pulse period widths of the rotational speeds of the first and second fans; and the microprocessor generating a pulse modulation signal to the second fan so as to control the rotational speed of the second fan to be equal to the rotational speed of the first fan.
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