Cooking apparatus and method thereof

A cooking apparatus comprising:

• a working coil;
• an inverter configured to output a resonant current to the working coil;
• a current detector configured to detect the resonant current and output a detection value corresponding to the resonant current;
• a voltage detector configured to detect an input voltage to the cooking apparatus;
• and
• a controller configured to:
• control the inverter to flow a first resonant current through the working coil,
• control the inverter to flow, through the working coil, a second resonant current having a frequency different from the first resonant current,
• compensate (i) a first detection value for the first resonant current based on the detected input voltage and (ii) a second detection value for the second resonant current based on the detected input voltage,
• determine, based on a difference between the compensated first detection value and the compensated second detection value, whether a target object that is located adjacent to the working coil is a predetermined object, and
• control, based on the target object being the predetermined object, the inverter according to a preset control value for the predetermined object, to thereby heat the target object.