The invention relates to the field of motor driving control, in particular to a motor
driving circuit with a
hysteresis window dynamically matched rotating speed. Comprising a Hall
voltage output module, an adjustable
hysteresis comparator module, a
logic control module, a three-phase non-overlapping
clock module, a
voltage stabilization and reference
voltage output module, a frequency multiplication module, a frequency voltage conversion module, an H-bridge driving
signal output module, a comparison module, an ROM module and a DAC module. The overturning
threshold voltage output by the
logic control module corresponds to the rotating speed of the motor, a
hysteresis window can be dynamically adjusted according to the rotating speed, the hysteresis window is relatively large at the low rotating speed, and the phenomenon that the motor shakes due to the influence of
noise and the like when the motor is at the
low speed and frequent reversing of a coil
magnetic field is reduced. And a relatively small hysteresis window is adaptively switched at a high rotating speed, so that the phase
delay during coil commutation can be reduced, a coil commutation
signal is synchronous with a rotor position, and the stability of the motor during high-speed operation is improved.