Refrigerator and method of controlling the same

A refrigerator comprising:

• a carbonated water tank to store carbonated water;
• a carbon dioxide cylinder to store carbon dioxide;
• a carbon dioxide supply valve to control flow of the carbon dioxide supplied to the carbonated water tank from the carbon dioxide cylinder;
• and
• a controller to sequentially supply water and the carbon dioxide to the carbonated water tank in order to produce the carbonated water,
• wherein the controller opens the carbon dioxide supply valve resupply the carbon dioxide to the carbonated water tank if a time duration elapsed after the carbonated water is produced is above a predetermined first reference time.

A method of controlling a refrigerator producing and storing carbonated water, the method comprising:

• sequentially supplying water and carbon dioxide to a carbonated water tank to store the carbonated water;
• discharging the carbonated water stored in the carbonated water tank through a dispenser;
• and
• opening a carbon dioxide supply valve, which controls flow of the carbon dioxide supplied to the carbonated water tank, in order to resupply the carbon dioxide to the carbonated water tank if a time duration for which the carbonated water is discharged through the dispenser is above a predetermined first reference time.