Line voltage adaptive refrigerator

The total compressor running time after defrost tn is calculated by adding the value obtained by multiplying the difference between the optimum defrost time tdefopt determined by the experiments and the actual defrost time tdef(n) with a constant value K determined by the manufacturer to the total compressor running time before defrost tn-1 without checking the line voltage first. The total compressor running time tyn adaptive to the line voltage is calculated by multiplying the difference between the square of the average line voltage value found by monitoring the line voltage during the defrost time by the line voltage measuring unit (8), and the average line voltage value measured during the previous defrost cycle, by a constant L value determined by the manufacturer and by adding this value to the above mentionned total compressor running period after defrost tn, that is calculated without regarding the line voltage.