Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1999-10-13
2000-04-11
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62 80, 62155, F25B 4702
Patent
active
060475544
ABSTRACT:
The present invention relates to an optimum defrosting cycle method of an inverter refrigerator. In the past, a defrosting cycle setting method for a conventional refrigerator with which a defrosting operation was carried out when the operation time of a compressor reaches a certain amount of time(e.g. 7 hours) by simply accumulating the operation time of the compressor. However, there have been drawbacks since the operation speed of a compressor varies for a high speed, mid speed, and low speed according to the surrounding condition when the conventional method is applied to the inverter refrigerator, it is not relevant to set the defrosting cycle by simply accumulating the operation time. For example, an over defrosting operation is performed and a power consumption is increased since the defrosting operation performed at an accumulative time in a state that a certain frosted amount is not obtained for an effective defrosting operation due to an increase operation factor in a case that a low speed operation of the compressor is continued. Accordingly, the present invention operates by a first step of checking the operation time of the compressor by operation frequencies in a defrosting mode, a second step of obtaining the frosting ratio per unit time of the compressor by operation frequencies, a third step of computing accumulated defrosting time using the operation time obtained in the first step and the frosting ratio obtained in the second step, and a fourth step of continuously accumulating the accumulated time computed in the third step if it does not reach a certain amount of time, or turning heaters "ON" for defrosting operation if it reaches a certain amount of time, thereby minimizing power consumption and improving the efficiency of the defrosting operation.
REFERENCES:
patent: 4302947 (1981-12-01), Mueller et al.
patent: 4417452 (1983-11-01), Ruminsky et al.
patent: 4751825 (1988-06-01), Voorhis et al.
patent: 5666816 (1997-09-01), Jeong et al.
LG Electronics Inc.
Tanner Harry B.
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