Compressor control apparatus and control method

A method for controlling a compressor including a rectifying unit configured to rectify power applied from an outside, a DC link unit configured to include a first capacitor and a second capacitor and smooth the rectified voltage, an inverter unit configured to include a first inverter switch and a second inverter switch and convert the smoothed DC voltage into a driving voltage of a motor according to a control signal, and a control unit configured to generate the control signal, the method comprising:

• measuring a voltage across each of the first capacitor and the second capacitor;
• comparing the measured voltages across the two capacitors;
• and
• applying a DC offset voltage to the driving voltage according to a direction of a current applied to the motor on the basis of the comparison result, wherein when a voltage across the first capacitor is greater than a voltage across the second capacitor, the driving voltage not including the DC offset voltage is applied in a time section of a direction of a second current flowing from a first node to a second node.