Patent ID: 8080963

Claim:
A motor driving circuit connected to a motor, the motor driving circuit comprising: a detecting unit for detecting a status of the motor and thus outputting a detecting signal; a signal control unit for generating a reference signal; a comparing unit electrically connected with the detecting unit and the signal control unit for receiving the detecting signal and the reference signal and thus outputting a comparing signal; and a driving unit electrically connected with the comparing unit for receiving the comparing signal and thus outputting a driving signal to drive the motor, and the motor driving circuit being connected to a system control end for receiving a pulse width modulation signal transmitted from the system control end, wherein the signal control unit comprises: a second filter device electrically connected with the system control end for converting the PWM signal into a DC signal; a signal generating device for generating a carrier signal; and a mixer device electrically connected with the signal generating device and the second filter device for mixing the carrier signal with the DC signal and then outputting the reference signal.