Patent ID: 7913500

Claim:
A method of controlling a refrigerator, the method comprising: performing a normal operation of a refrigerating storage room and a normal operation of a freezing storage room selectively or simultaneously; setting a defrosting time period, which is varied according to certain parameters; and performing a defrosting operation based on the set defrosting time period, wherein setting the defrosting time period comprises: setting a reference defrosting time period; calculating a variation of the time period according to the parameters, comprising: measuring a relative humidity of external air; measuring an opening time of a door of the refrigerator; determining a first constant, which is variable according to the relative humidity; and determining a second constant, which is variable according to the relative humidity and the opening time of the refrigerator door; and setting an actual defrosting time period on the basis of the reference defrosting time period and the variation of the time period.