KR0175491B1 - Defrosting controller apparatus of a rfrigerator and its method - Google Patents

Abstract

The present invention relates to a defrosting control device for a refrigerator and a control method thereof, which are provided in a main body (1) partitioned into a freezing compartment (2) and a refrigerating compartment (2 ') by a partition wall (3), and provided behind the freezing compartment (2). It is provided on the evaporator (5) and the evaporator (5) to produce a cold air generated in the evaporator (5) to the freezing chamber (2) and the refrigerating chamber (2 ') for introducing high internal air into the evaporator Fan 4 ′, a cold air circulation blocking damper 8 that blocks cold air generated in the evaporator 5 from flowing into the freezer compartment 2 when defrosted, and cold air blown by the fan 4 ′. Is provided in the distribution passage 14 and the partition 3 to distribute the air into the freezer compartment 2 and the refrigerating compartment 2 ', and the freezer compartment guides the air of the freezer compartment 2 and the refrigerating compartment 2' to the evaporator 5, respectively. Inner wall separating the space of the guide passage 6 ', the refrigerator compartment guide passage 7, the freezer compartment 2, and the space in which the fan 4' and the evaporator 5 are installed. Between the 10 'and the outer wall 11' and between the outer wall 11 'and the inner wall 10', the internal air sucked through the freezer compartment guide passage 6 'and the refrigerator compartment guide passage 7 is stored in the freezer compartment ( 2) is characterized in that the separator is separated into the cold air discharged to guide the fan (4 '). Therefore, the present invention can prevent the rise in the internal temperature of the defrost heater and at the same time remove the defrost water quickly and effectively, thereby reducing power consumption and improving cooling efficiency.

Description

Defrost control device of the refrigerator and its control method

The present invention relates to a defrosting control device of the refrigerator and an example of a control method thereof. In particular, after removing the frost formed on the evaporator by using the defrost heater, the frost and defrost water remaining in the evaporator can be removed by using the air in the refrigerating chamber. A defrosting control apparatus of a refrigerator and a control method thereof.

1 is a cross-sectional view showing a schematic configuration of a conventional refrigerator, and a conventional refrigerator is installed at a rear of a main body 1 and a freezing chamber 2 partitioned into a freezing chamber 3 and a refrigerating chamber 2 'by a partition wall 3. An evaporator 5 generating cold air and having a defrost heater 12 attached thereto, a fan 4 provided at an upper side of the evaporator 5 to introduce high-temperature air into the evaporator 5 and forcibly blowing heat-exchanged cold air; And a distribution passage 13 for distributing cold air forcedly blown by the freezer compartment 2 and the refrigerating chamber 2 ', and a freezer compartment guide passage 6 and a refrigerating chamber guide passage 7 provided in the partition 3. The freezer compartment guide flow path 6 is formed in the middle of the partition 3 in order to guide the cold air discharged into the freezer compartment 2 by the fan 4 to enter the evaporator 5 after circulating the freezer compartment. In addition, the refrigerating compartment guide flow passage 7 is introduced into the refrigerating compartment 2 'through the distribution passage 13 and circulates to guide the reflow of the freezer compartment guide passage 6 to guide the flow into the evaporator 5 again. Each is provided in.

In a conventional refrigerator, the fan 4 is driven to cool the freezer compartment 2 and the refrigerating compartment 2 '. When the fan 4 is driven, the air inside the freezer compartment 2 and the refrigerating compartment 2' It is sucked through the freezer compartment guide passage 6 and the refrigerating compartment guide passage 7 formed in the partition 3, respectively, flows into the lower part of the evaporator 5, heats through the evaporator 5, cools, and is forcedly blown upwards. A part is discharged into the freezer compartment 2 through the discharge port of the inner wall 10 provided at the rear of the freezing chamber 2 and the rest is discharged through the distribution passage 13 via the inner wall 10 and the outer wall 11. It flows into the refrigerating chamber 2 '. The cold air forced into the freezer compartment flows into the evaporator 5 through the freezer compartment guide flow path 6 to complete the cooling operation and to heat exchange again, and the cold air forced into the refrigerating compartment 2 'to the humid air after finishing the cooling operation. It enters the evaporator through the refrigerating chamber guide flow path.

In the cold air circulation process of the conventional refrigerator, the air of the image flowing into the evaporator 5 after circulating the refrigerating chamber 2 'contains a large amount of moisture, and the air of the humid image is an evaporator 5 below freezing point. In contact with the frost forms frost on the surface of the evaporator (5). If frost is formed in the evaporator 5, the heat exchange is not properly performed, so the efficiency of the evaporator 5 is lowered and the power consumed is also increased. Therefore, a defrosting operation for removing the frost of the evaporator 5 is required.

In view of this, the conventional refrigerator prevents defrost of the evaporator 5 by attaching the evaporator 5 to the evaporator 5 by blocking the cold air passage flowing from the evaporator 5 into the freezing chamber 5 and circulating the air inside the refrigerating chamber 2 '. It has been proposed to defrost the evaporator 5 by circulating the heated air using the defrost heater 12 and the fan 4, respectively.

However, when the defrost of the evaporator 5 is removed by circulating the air inside the refrigerating chamber 2 'as in the former method, the refrigerating chamber 2' is stopped while the compressor is stopped and the freezer cold air circulation damper is blocked. Defrosting is performed because of high internal air, so defrosting time is too long, there is a problem that the power consumption is not only increased, but also the frost is not completely removed.

In addition, as in the latter method, a method in which air heated by the defrost heater 12 is forcedly blown by the fan 4 to remove frost formed on the evaporator 5 includes a defrost that senses the temperature of the evaporator 5. The thermostat (not shown) should be provided, and as the temperature of the refrigerating chamber 2 'and the freezing chamber 2 rises by driving the defrost heater 12, the cooling efficiency is lowered. Since the defrosting water melted in the frost is not condensed quickly and effectively because it is opposite to the falling direction of the defrosting water, there is a problem of lowering the efficiency of the evaporator 5.

An object of the present invention is to circulate the air in the refrigerator compartment from the top of the evaporator to the bottom of the evaporator while the defrost heater is stopped when the internal temperature of the refrigerator compartment becomes high while removing the frost formed on the evaporator with the air heated by the defrost heater. The present invention provides a defrosting control device and a control method of the refrigerator to remove the defrost water quickly and effectively while preventing the rise of the internal temperature by driving the defrost heater by removing the frost and defrost water.

1 is a cross-sectional view showing a schematic configuration of a conventional refrigerator.

Figure 2 is a cross-sectional view showing a schematic configuration of a defrost control device of a refrigerator according to the present invention.

Figure 3 is a perspective view of the main part of Figure 2;

Figure 4 is a rear view showing a distribution channel of the defrost control device of the refrigerator according to the present invention.

5 is a control block diagram of a defrosting control device of a refrigerator according to the present invention;

6 is an operation flowchart showing a defrost control method of a refrigerator according to the present invention;

* Explanation of symbols for main parts of the drawings

2: freezer 2 ': refrigerator

3: bulkhead 4,4 ': fan

5: evaporator 6,6 ': freezer guide flow path

7,7 ': Refrigeration chamber guide euro 8: cold air circulation damper

9: Separator 10,10 ': Inner Wall

11,11 ': outer wall 12: defrost heater

13,14: distribution channel 15: suction port

16: cold storage door

The defrosting control device of the refrigerator according to the present invention as described above comprises a freezer compartment and a refrigerating compartment partitioned by a partition wall, an evaporator that generates cold air by exchanging heat with air in the freezer compartment and the refrigerating compartment, and the air inside the freezer compartment and the refrigerating compartment, respectively. A refrigerator having a freezer compartment guide passage and a refrigerating compartment guide passage formed in the partition wall to guide the evaporator, and a defrost heater installed to remove the phase formed on the evaporator, wherein the refrigerator is installed on the evaporator by driving the defrost heater. If is not completely removed is installed on the upper side of the evaporator so as to remove the debris remaining in the evaporator by the high internal air of the refrigerating chamber to suck the high internal air of the refrigerating compartment and forced air blowing from the top of the evaporation to the bottom Pan; A cold air circulation blocking tamper for opening and closing a discharge port for discharging the cold air heat-exchanged by the evaporator into the freezing compartment, the inner wall separating the freezing compartment and the evaporator; An outer wall disposed between the inner wall and the evaporator to guide cold air generated by the evaporator to the freezing compartment and the refrigerating compartment, respectively; An outer wall guided by the freezer compartment guide passage and the refrigerating compartment guide passage, respectively; Separation plate provided between the inner wall and the outer wall to guide the high air inside each of the freezing chamber guide flow path and the refrigerating chamber guide flow path to the upper side of the evaporator and separate from the cold generated by the evaporator. ; And driving the defrost heater and the fan to remove the frost formed on the evaporator. When most of the frost formed on the evaporator is removed by air heated by the defrost heater, driving of the defrost heater is stopped. It is achieved by a control unit for controlling the operation of driving the fan to remove the frost and defrost water remaining in the evaporator to the high air in the refrigerator compartment.

The defrosting control method of the refrigerator according to the present invention as described above comprises a freezer compartment and a refrigerating compartment partitioned by a partition wall, a refrigerating compartment door for opening and closing the refrigerating compartment, an evaporator having a defrost heater and heat exchange with the air in the refrigerating compartment, and the refrigerating compartment. A defrosting control method of a refrigerator for removing the frost formed on the evaporator by driving the defrost heater by a fan for forced air blowing to the evaporator to detect the internal temperature of the refrigerating chamber, and a refrigerating chamber temperature sensing unit for detecting the internal temperature of the refrigerating chamber. The defrost heater and the defrost heater to remove the frost formed on the evaporator while the internal temperature of the refrigerating compartment sensed by the refrigerating compartment temperature sensing unit is below a defrost control temperature set to prevent the high temperature rise of the refrigerating compartment. Driving a fan (a); If the internal temperature of the refrigerator compartment is higher than the defrost control temperature, the defrost heater stops driving and sets the detected internal temperature of the refrigerator compartment to a first set temperature, and the frost that is not completely removed by the operation of the defrost heater. Driving the fan for a predetermined time so as to remove the air in the refrigerating compartment (B); And setting the internal temperature of the refrigerator compartment immediately after removing the frost remaining in the evaporator to a second set temperature, and comparing the first set temperature set in the step (b) to determine whether the defrost is completed, and the defrost is not completed. If not, the above process (a) is achieved by the process (c) of repeating the following.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing a schematic configuration of a defrosting control apparatus for a refrigerator according to the present invention, Figure 3 is a perspective view of the main part of Figure 2, Figure 4 is a distribution passage of the defrosting control apparatus of the refrigerator according to the present invention The rear view shown.

As shown, the defrost control device of the refrigerator according to the present invention is provided in the main body 1 partitioned into the freezing compartment 2 and the refrigerating compartment 2 'by the partition 3, and provided behind the freezing compartment 2 The evaporator 5 to be produced and the upper side of the evaporator 5 are provided to blow cold air generated by the evaporator 5 to the freezing chamber 3 and the refrigerating chamber 2 'and to store high internal air in the evaporator 5. A fan 4 'to be introduced into the furnace, a cold air circulation blocking damper 8 to block the cold air generated in the evaporator 5 from flowing into the freezing compartment 2 when defrosting, and the fan 4'. A distribution passage 14 for distributing cold air to the freezing compartment 2 and the refrigerating compartment 2 'and air in the freezing compartment 2 and the refrigerating compartment 2' are introduced into the evaporator 5 respectively. And a freezer compartment guide passage 6 'and a refrigerator compartment guide passage 7' for guiding the guide. In addition, the present invention, the inner wall (10 ') and the outer wall (11) to the rear of the freezer compartment (2) to separate the space of the freezer compartment (2) for storing food and the space where the fan (4') and the evaporator (5) is installed ') Is formed. Between the outer wall 11 ′ and the inner wall 10 ′, the air inside the freezer drawn through the freezer compartment guide passage 6 ′ and the refrigerator compartment guide passage 7 ′ to the upper portion of the evaporator 5 is introduced. Separation plate 9 is provided which separates the cold air discharged to (2) and guides it to the fan 4 '.

The inner wall 10 ′ has discharge ports for discharging the cold air heat-exchanged in the evaporator 5 into the freezing chamber 2, respectively, and the cold air circulation damper 8 is provided at the discharge port front face, respectively. The outer wall 11 'is provided with a suction port 15 at both lower ends of the both sides to discharge the cold air generated by the evaporator 5 to the freezing chamber 2, and the fan 4' at the upper end of the middle portion thereof. Prepared.

The high internal air sucked into the upper part of the evaporator 5 by the driving of the fan 4 'is forcedly blown to the lower part of the evaporator 5 to perform heat exchange. 11 ') is sucked in through the inlet 15 and flows into the outlet of the inner wall 10', while the rest flows into the refrigerating chamber 2 'through the distribution passage 14.

The cold air discharged into the freezer compartment 2 is heat-exchanged with the high-temperature air, and the heat-exchanged high-temperature air flows into the freezer compartment guide passage 6 'and passes through the distribution passage 14 to the refrigerating compartment 2'. The cold air discharged into the heat exchanged with the fixed air, and the heat exchanged high-temperature air flows into the refrigerating chamber guide flow path 7 '.

5 is a control block diagram of a defrost control apparatus of a refrigerator according to the present invention. The defrosting control device of the refrigerator according to the present invention includes a refrigerator compartment temperature detector 31 for detecting an internal temperature of the refrigerator compartment 2 ', and a freezer compartment temperature detector 32 for detecting an internal temperature of the freezer compartment 2; A door opening detecting unit 34 for detecting a door opening of the refrigerating chamber door 16 that opens and closes the refrigerating compartment 2 ', a compressor driving unit 35 for driving a compressor, and the fan when the compressor is driven or defrosted. Fan drive unit 36 for driving 4 ', defrost heater unit 37 for driving the defrost heater 12 during defrosting, and cold air circulation blocking damper for blocking cold air circulation of the freezing chamber 2 during defrosting. Defrost heater driving unit for driving the defrost heater 12 when the defrost time by the cold air circulation blocking damper driver 38, the defrost timer 33 for measuring the defrost time, and the defrost time 33 to drive the defrost time 37) and a control unit 30 for stopping the compressor and controlling driving of the fan 4 'and the heater 12 during defrosting. The rain.

When the control unit 30 removes a considerable amount of frost formed on the evaporator 5 by the air heated by the defrost heater 12, the fan 4 ′ is stopped when the defrost heater 12 is driven. ) To remove the frost and defrost water remaining in the evaporator (5) by the air in the refrigerating chamber (2 ').

6 is a flowchart illustrating a defrost control method of a refrigerator according to the present invention. A defrosting control method of the refrigerator according to the present invention will be described with reference to FIGS. 5 and 6.

First, in step 110, the controller 30 stops driving of the compressor when the defrost time measured by the defrost timer 33 arrives, and in step 120, the control unit 30 of the cold air discharged to the freezing chamber 2. In order to block the circulation, the control unit 30 controls the cold air circulation blocking damper driver 38 to close the cold air circulation blocking damper 8, wherein the step 120 is performed in a direct cooling refrigerator having a separate refrigerator compartment evaporator. This is an unnecessary step. When the cold air circulation blocking damper 8 is blocked in step 120, in step 130, the controller 30 controls the fan driver 36 to drive the fan 4 ′ and in step 140. The controller 30 drives the defrost heater driving unit 37 to drive the defrost heater 12. As a result, the air heated by the defrost heater 12 is forcedly blown from the upper portion to the lower portion of the evaporator 5 by the fan 4 ′ to remove frost formed on the evaporator 5. At this time, the air heated by the defrost heater 12 is guided to the refrigerating chamber (2 ') through the distribution passage 14 from the lower part of the evaporator (5) and to heat exchange with the air inside the refrigerating chamber (2'). Therefore, the internal temperature of the refrigerating chamber 2 'is gradually increased.

In step 150, the refrigerating compartment temperature detecting unit 31 senses the internal temperature of the refrigerating compartment 2 'and outputs it to the control unit 30, and the control unit 30 is connected to the refrigerating compartment temperature detecting unit 31. The internal temperature T of the refrigerating compartment 2 'detected by the controller is compared with the set defrost control temperature T _R. This defrost control temperature T _R is a temperature for judging the completion of defrost and is usually set to 7 ° C.-15 ° C. The internal temperature T of the refrigerating compartment 2 'is frost formed on the evaporator 5 because the cold air flowing into the evaporator 5 after the circulation of the refrigerating compartment 2' is deprived of heat. It does not rise until a considerable amount is removed. If the internal temperature T of the refrigerating chamber 2 'exceeds the defrost control temperature T _R , the frost formed on the evaporator 5 is almost removed. In order to suppress the temperature rise of the refrigerating chamber 2, the drive of the defrost heater 12 must be stopped.

Therefore, if the internal temperature T1 of the refrigerating compartment 2 'is not greater than the defrosting control temperature T _R , the comparison result of step 150 continues to remove defrost, while the comparison result of step 150 is continued. If the internal temperature T1 of the refrigerating chamber 2 'is greater than the defrost control temperature T _R , that is, a considerable amount of frost formed on the evaporator 5 is removed, the control unit 30 at step 160 The defrost heater driving unit 37 is controlled to stop driving of the defrost heater 12. At this time, the high air inside the refrigerating compartment 2 ', ie, the cold air of the image, is sucked through the refrigerating compartment guide passage 7' by driving the fan 4 'and forced from the upper part of the evaporator 5 to the lower part. After the air is blown, the circulation process introduced into the refrigerating chamber 2 'through the distribution passage 14 is repeatedly performed to completely remove the frost remaining in the vaporizer 5.

In step 170, the control unit 30 stops driving of the defrost heater 12, that is, only the high air inside the refrigerating chamber 2 ′ to completely remove frost formed on the evaporator 5. The high temperature inside temperature T at the time of this forced ventilation is set to the 1st set temperature T1. In step 180, the control unit 30 clears the timer to '0', and in step 190, the control unit 30 opens the refrigerating chamber door 16 according to a detection signal of the door opening detecting unit 34. Determine if state

As a result of the determination in step 190, when the refrigerating chamber door 16 is opened, in step 200, the control unit 30 stops driving of the fan 4 'to the air inside the refrigerating chamber 2'. The defrosting operation for removing frost remaining in the evaporator 5 is stopped. In step 210, the control unit 30 determines the opened state of the refrigerating chamber door 16 again. If the refrigerating chamber door 16 is in a state of being opened continuously as a result of the determination of step 210, if the refrigerating chamber door 16 is closed as a result of the determination of step 210, the control unit 30 is the refrigerating compartment in step 220. The internal temperature T of the refrigerating compartment 2 ', whose temperature rises due to the opening of the door 16, is reset to the first preset temperature T1. In step 230, the control unit 30 drives the fan 4 ′ stopped in step 200 again to remove the frost formed on the evaporator 5 by the air inside the refrigerating chamber 2 ′. Return to step 180 to be able to.

When the refrigerating chamber door 16 is closed as a result of the determination of step 190, in step 240, the controller 30 determines whether the time measured by the timer is greater than or equal to a predetermined time t1. As a result of the determination in step 240, if the timer measured time is not more than a predetermined time t1, the operation of removing frost formed on the evaporator 5 by the air inside the refrigerating chamber 2 'in step 250 is performed. If the time measured by the timer is greater than or equal to a predetermined time t1 as a result of the determination of step 240, the control unit 30 controls the refrigerating chamber 2 ′ in step 260. Since the operation of removing the frost formed on the evaporator 5 by the high internal air is completed, the internal temperature T of the refrigerating chamber 2 'is set to the second set temperature T2. In step 270, the controller 30 remarks the first set temperature T1 set in step 170 and the second set temperature T2 set in step 260. When the second set temperature T2 is not greater than the first set temperature T1 as a result of the comparison of step 270, the high air in the refrigerating chamber 2 ′ deprives heat of removing frost formed on the evaporator 5. Since the internal temperature of the refrigerator compartment 2 ′ is not increased, the controller 30 drives the defrost heater 12 in step 280, and then returns to step 150.

On the other hand, when the second set temperature T2 is greater than the first set temperature T1 as a result of the comparison of the step 270, the frost formed on the evaporator 5 is completely removed, and thus the internal temperature of the refrigerating chamber 2 'is increased. In step 290, the controller 30 clears the timer to '0' because it is in an elevated state. In step 300, the controller 30 determines whether the time measured by the timer is greater than or equal to a predetermined time t2. In step 300, the control unit 30 attaches to the cooling fins of the evaporator 5 by the high internal air of the refrigerating chamber 2 ′ in step 310 if the time measured by the timer is not more than a predetermined time t2. In order to continue the operation of removing the defrost water, the measured value of the timer is increased by 1, and the air in the refrigerator compartment 2 'by the fan 4' is forcedly blown from the upper part of the evaporator 5 to the lower part. Therefore, the defrosting water can be quickly and effectively removed by matching with the falling direction of the defrosting water. On the contrary, if the time measured by the timer is greater than or equal to the predetermined time t2, the controller 30 cools the evaporator 5 with air in the refrigerator compartment 2 'in step 320. In step 330, the control unit 30 stops the driving of the fan 4 'to control the fan motor driving unit 36 to terminate the operation of removing the defrost water attached to the pin. The cutoff damper driver 38 is controlled to open the cold air circulation blocking damper 8 to end the defrosting operation.

The present invention as described above is to circulate the air heated by the defrost heater during defrosting to remove a considerable amount of frost on the evaporator to drive the fan for a predetermined time in the state of stopping the drive of the defrost heater evaporator into the high air in the refrigerating chamber The frost remaining on the evaporator can be completely removed, and the defrost water attached to the cooling fin of the evaporator can be removed quickly and effectively by matching the blowing direction of the high internal air forced by the fan with the falling direction of the defrost water. It has the effect of reducing the cost and improving the cooling efficiency.

Claims (4)

The freezer compartment 2 and the refrigerating compartment 2 'partitioned by the partition 3, the evaporator 5 which generates cold air by heat-exchange with air inside the freezer compartment 2 and the refrigerating compartment 2', and the freezer compartment ( 2) and the freezer compartment guide passage 6 'and the refrigerator compartment guide passage 7' formed in the partition 3 so as to guide the air inside the refrigerating chamber 2 'to the evaporator 5, respectively. In the refrigerator having defrost heater 12 installed to remove the frost formed in the refrigerator, when the frost formed on the evaporator 5 is not completely removed by the drive of the defrost heater (12) In order to remove the frost remaining in the evaporator 5 by the high internal air of 2), it is installed on the upper side of the evaporator 5 to suck the high internal air of the refrigerating chamber 2 'and the upper portion of the evaporator 5 Fan (4 ') forced to be blown to the lower part in the air: discharge the cold air heat exchanged in the evaporator (5) into the freezer compartment (2) A cold air circulation blocking damper 8 for opening and closing a discharge port is provided, and an inner wall 10 ′ separating the freezing chamber 2 and the evaporator 5: between the inner wall 10 ′ and the evaporator 5. An outer wall 11 'installed at an inner side to guide the cold air generated by the evaporator 5 to the freezer compartment 2 and the refrigerating compartment 2, respectively: the freezer compartment guide passage 6' and the refrigerating compartment guide passage 7 ') Guides the high internal air introduced by') to the upper side of the evaporator 5 and separates the cold air generated in the evaporator 5 from the inner wall 10 'and the outer wall 11'. Separation plate (9) provided between the: and to drive the defrost heater 12 and the fan (4 ') in order to remove the frost formed on the evaporator (5), heated by the defrost heater 12 When most of the frost formed on the evaporator 5 is removed by the air, the fan 4 'is stopped while the defrost heater 12 is driven. And a control unit (30) for controlling the operation of removing frost and defrost water remaining in the evaporator (5) by the air inside the refrigerating chamber (2 '). The freezer compartment 2 and the refrigerator compartment 2 'partitioned by the partition 3, the refrigerator compartment door 16 which opens and closes the refrigerator compartment 2, and the internal air of the refrigerator compartment 2' are sucked in and the evaporator 5 A fan 4 'forcibly blown therein is provided with a refrigerating compartment temperature detecting unit 31 for detecting a high temperature inside the refrigerating compartment 2' and implanted in the evaporator 5 by driving the defrost heater 12. In the defrosting control method of the refrigerator to remove frost, (A) the internal temperature T of the refrigerating compartment 2 'detected by the refrigerating compartment temperature detecting unit 31 increases the internal temperature of the refrigerating compartment 2'. Driving (130, 140, 150) the defrost heater (12) and the fan (4 ') to remove frost formed on the evaporator (5) while the defrost control temperature (T _R ) is set to prevent the frost; (B) If the internal temperature T of the refrigerating compartment 2 'is equal to or greater than the defrost control temperature T _R , the driving of the defrost heater 12 is stopped and the internal temperature of the refrigerating compartment 2' detected at this time ( T) is set to the first set temperature, and the fan is removed for a predetermined time t1 so that frost not completely removed by the defrost heater 12 can be removed by the air inside the refrigerating chamber 2 '. Driving processes (160, 170, 180, 240, 250); And (c) setting the internal temperature T of the refrigerating chamber 2 'immediately after removing the frost remaining in the evaporator 5 to a second set temperature T2 and then setting the first temperature set in the step (b). Determination of the completion of defrosting compared to the set temperature (T1), and if the defrosting is not complete defrosting control method of the refrigerator comprising the steps (260, 270, 280) to repeat the following steps. According to claim 2, During the operation of the fan (4 ') to remove the frost remaining in the evaporator (5) according to the process (b), by detecting the opening of the refrigerating chamber door (16) If the refrigerating chamber door 16 is opened, the method further includes resetting the internal temperature T of the refrigerating chamber 2 ', which is raised due to the opening of the refrigerating chamber door 16, to a first set temperature T1 (190, 200, 210, 220, 230). Defrost control method of the cold storage, characterized in that. The method of claim 2, wherein when the defrost is completed in the process (c), when the defrost is completed, further driving the fan for a predetermined time to remove the defrost water remaining on the cooling fin of the evaporator (290, 300, 310, 330). Defrost control method of a refrigerator comprising a.