Patent ID: 7698902

Claim:
A defrost operating method for a refrigerator, comprising: while cool air is generated in the refrigerator inside by circulating refrigerants along a refrigeration cycle built in an inner wall of a refrigerator main body, and forcibly circulated by rotating a fan, a first step for calculating a continuous operation time of a compressor by accumulating an operation time of the compressor, and measuring surface temperatures of evaporators; and a second step for performing a defrost operation by controlling operations of the compressor and the fan on the basis of the continuous operation time of the compressor and the surface temperatures of the evaporators calculated in the first step, wherein the first step comprises: a first process for judging opening/closing of refrigerator doors for opening/closing the refrigerator main body; when the refrigerator doors are closed in the first process, a second process for comparing refrigerator inside temperatures with a set refrigerator inside temperature; and when the refrigerator inside temperatures are equal to or higher than the set refrigerator inside temperature in the second process, a third process for calculating the continuous operation time of the compressor and when the refrigerator inside temperatures are lower than the set refrigerator inside temperature in the second process, a process for stopping the compressor, wherein, even though the compressor is stopped, when the surface temperatures of the evaporators are equal to or lower than the set surface temperature, the defrost operation is performed in a state where the fan is operated, and wherein a rotating speed of the fan is inversely proportional to variations of the surface temperatures of the evaporators.