| 摘要 |
A fan motor driving apparatus which can set the frequency of a cooling fan flexibly is provided. The fan motor driving apparatus drives a fan at the frequency based on the control voltage and the ambient temperature, thereby cooling a target CPU. The first control unit includes a thermostor and a first resistor and outputs a first voltage obtained by multiplying the control voltage by a first coefficient dependent on the ambient temperature. The second control unit outputs a second voltage obtained by multiplying the control voltage by a predetermined coefficient. The selection unit selects the higher of the first and the second voltages, and outputs the selected voltage to a drive control unit. The drive control unit drives the fan motor based on the voltage.
|
