Speed adjustment circuit for a plurality of fans
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United States of America Patent
Stats
-
Apr 23, 2013
Grant Date -
May 31, 2012
app pub date -
Jan 17, 2011
filing date -
Nov 25, 2010
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speed adjustment circuit for a plurality of fans includes a voltage input terminal, a plurality of speed control modules, and a fan tachometer. Each of the speed control modules includes a fan connector, a speed adjusting unit, and a detector switch unit. The speed adjusting unit includes a switching control unit, a voltage adjusting chip, and a variable resistor. The detector switch unit includes a first switch. The voltage input terminal connects to the input terminal of the voltage adjusting chip through the switching control unit. The output terminal of the voltage adjusting chip connects to the power pin of the fan connector. The adjusting terminal of the voltage adjusting chip connects to ground through the variable resistor, and connects to the output terminal of the voltage adjusting chip through a resistor. The detection pin of the fan connector connects to the fan tachometer through the first switch.
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