Fan speed control circuit
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United States of America Patent
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-
May 7, 2013
Grant Date -
Nov 1, 2012
app pub date -
Jun 29, 2011
filing date -
Apr 28, 2011
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fan speed control circuit for controlling the rotation speed of a fan motor unit. The speed control circuit includes a resistor, a voltage stabilizing unit, a transistor and a thermal resistor. The resistor is connected to a power source of the fan motor unit, the voltage stabilizing unit is connected between the resistor and ground. The collector of the transistor is connected to the fan motor unit, the base is connected to a node between the resistor and the voltage stabilizing unit. The thermal resistor is connected between an emitter of the transistor and ground.
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