Apparatus for controlling charging system using motor-driving system

An apparatus for controlling a charging system that receives an external charging current at a neutral point of a motor and provides the received external charging current to a battery using a motor-driving system, wherein the motor-driving system includes the battery, an inverter for receiving DC power stored in the battery at a time of driving of the motor to convert the received DC power into three-phase AC power and to output the three-phase AC power to the motor, and the motor for generating torque using the three-phase AC power output by the inverter, the apparatus comprising:

• a voltage controller configured to compare a voltage command of the neutral point of the motor with a motor neutral point voltage obtained by detecting a voltage of the neutral point of the motor and to generate a neutral point current command for causing the motor neutral point voltage to follow the voltage command;
• and
• a current command generator configured to receive the neutral point current command and a rotor angle of the motor, to set one of abc three-phase currents to zero based on a position of abc coordinates corresponding to the rotor angle of the motor, and to determine remaining two-phase currents for making the torque of the motor zero.