Motor controller

A motor controller configured to drive a motor, wherein the motor has a motor coil, the motor coil has a first terminal and a second terminal, and the motor controller comprises:

• a switch circuit, configured to supply a motor current to the motor coil, wherein the switch circuit comprises a first upper-side switch, a second upper-side switch, a first lower-side switch, and a second lower-side switch, the first upper switch is coupled to a third terminal and the first terminal, the first lower-side switch is coupled to the first terminal and a fourth terminal, the second upper-side switch is coupled to the third terminal and the second terminal, and the second lower-side switch is coupled to the second terminal and the fourth terminal;
• a pre-driver, configured to generate a plurality of driving signals to control the switch circuit;
• a control unit, configured to generate a control signal to the pre-driver;
• a phase detecting unit, configured to generate a phase signal to the control unit;
• a first resistor, coupled to the fourth terminal and a fifth terminal;
• and
• a comparator, coupled to the first terminal and the fourth terminal for generating a detecting signal to the control unit, wherein when the motor controller performs a last pulse width modulation driving with respect to the first lower-side switch before phase switching, the second upper-side switch is turned off and the first lower-side switch is kept turning on.

A motor controller configured to drive a motor, wherein the motor has a motor coil, the motor coil has a first terminal and a second terminal, and the motor controller comprises:

• a switch circuit, configured to supply a motor current to the motor coil, wherein the switch circuit comprises a first upper-side switch, a second upper-side switch, a first lower-side switch, and a second lower-side switch;
• a pre-driver, configured to generate a plurality of driving signals to control the switch circuit;
• and
• a control unit, configured to generate a control signal to the pre-driver, wherein when the motor controller performs a last pulse width modulation driving with respect to the first lower-side switch before phase switching, the second upper-side switch is turned off and the first lower-side switch is kept turning on, thereby facilitating a detection of a zero point of the motor current.