Patent ID: 8796975
Filing Date: 2014-08-05
Classification: H02P

Abstract:
1. A motor driving apparatus including a control unit, a soft-start unit, and an output unit, wherein the motor driving apparatus is characterized in that: the soft-start unit includes: an internal pulse width modulation (PWM) pulse signal generator configured to provide an internal PWM driving signal; a power-up initial generator configured to provide a power-up initial signal; a FG counter connected to a motor rotation signal and the power-up initial signal via an input end of the FG counter, and configured to count a number being a multiple of the motor rotation signal (FG) so as to output a control signal; a RS latch circuit having an input end connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and a select circuit having a first input end connected to an external PWM driving signal, a second input end connected to the internal PWM driving signal, a third input end connected to the select signal, and a output end transmitting a soft-start control signal to the control unit; wherein when power-up and the external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates the internal PWM driving signal and provides the power-up initial signal; after the power-up initial signal is generated, the control unit transmits the motor rotation signal to the soft-start circuit, and the soft-start circuit selects the internal PWM driving signal and outputs the soft-start control signal to the control unit; and when the soft-start circuit receives the motor rotation signal and the power-up initial signal, the soft-start circuit counts the number being a multiple of the motor rotation signal (FG) and selects the external PWM driving signal and transmits the soft-start control signal to the control unit.