| 摘要 |
A control system of transferring pulse width modulation for a cooling fan motor includes an input end of pulse width modulation, a transfer unit, a transfer unit and a drive circuit. The input end of pulse width modulation is for inputting pulse width modulation signal. The transfer unit is connected to the input end and transforms the pulse width modulation signal as analog voltage signals in different reference levels based on different duty cycles of the pulse with modulation signal. The drive circuit controls rotational speed of the fan motor based on the analog voltage signals in different levels.
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