Motor drive overcurrent blocking circuit, motor driving circuit and method for blocking overcurrent thereof

A motor driving circuit comprising:

• a motor driving unit switched according to a driving control signal to drive a motor while comprising a source switching element group connected to an upper side of an H-bridge to apply a power voltage to the motor and a sink switching element group connected to a lower side of the H-bridge to sink a current flowing through the motor to a sensing terminal for sensing a current;
• a driving control unit for applying the driving control signals for controlling the source and sink switching element groups of the motor driving unit;
• an overcurrent sensing unit connected between a lower end of the sink switching element group and a ground to sense a current flowing in the turned-on switching element of the sink switching element group in the sensing terminal;
• and
• an overcurrent blocking unit turned on according to a voltage due to an overcurrent sensed by the overcurrent sensing unit and blocking the overcurrent by sinking the driving control signal applied to the turned-on switching element of the sink switching element group to the ground.

A method for blocking an overcurrent in a motor driving circuit comprising a source switching element group connected to an upper side of an H-bridge to apply a power voltage to a motor and a sink switching element group connected to a lower side of the H-bridge to sink a current flowing through the motor to a sensing terminal for sensing a current, comprising:

• driving the motor by turning on one switching element of each of the source and sink switching element groups according to a driving control signal;
• sensing a current flowing in the turned-on switching element of the sink switching element group through a sensing resistor connected between a lower end of the sink switching element group and a ground;
• and
• blocking an overcurrent by turning on an overcurrent blocking switching element according to a voltage due to an overcurrent sensed in sensing the current to sink the driving control signal applied to the turned-on switching element of the sink switching element group to the ground.