KR20080025604A - Refrigerator and safety control method thereof - Google Patents

Abstract

A refrigerator and a safety control method thereof are provided to secure safety for a user by blocking a high voltage applied to a shelf within the refrigerator when a door switch is malfunctioning or the user makes contact to the shelf, and by applying the high voltage only when a sensed indoor temperature is lower than a predetermined temperature. A safety control method for a refrigerator having a storage compartment for storing foods, comprises the steps of: sensing an indoor temperature within the storage compartment; comparing the sensed indoor temperature with a predetermined temperature and generating high voltage, if the indoor temperature is lower than the predetermined temperature; supplying the generated high voltage into the storage compartment for storing the foods; discriminating if a high voltage blocking condition is generated during the supply of high voltage to the storage compartment; and blocking the high voltage supplied to the storage compartment, if the high voltage blocking condition is generated.

Description

Refrigerator and safety control method

1 is a front view of a refrigerator according to the present invention;

2 is a partial perspective view of FIG. 1;

3 is a safety control block diagram of a refrigerator according to a first embodiment of the present invention;

4 is a safety control block diagram of a refrigerator according to a second embodiment of the present invention;

5a and 5b is an operation flowchart of a safety control method of a refrigerator according to the present invention;

      * Description of symbols on the main parts of the drawings *

12: storage room 14: door

16: door switch 20: high voltage generator

22: shelf 24: temperature sensor

28: contact sensor 50: commercial power

56 current detection unit 60 control unit

62: power drive unit 64: power switch

66: display unit

The present invention relates to a refrigerator for applying a high voltage to a shelf on which a food is placed to increase food preservation, and more particularly, to a refrigerator and a safety control method for ensuring safety from a high voltage applied to a shelf. .

In general, the refrigerator is applied with a conventional cooling system in which the refrigerant is circulated therein to absorb the ambient heat when the refrigerant in the liquid state vaporizes to supply the generated cool air to the food storage compartment to keep various foods fresh for a long time. In recent years, according to the changes in the various lifestyles and preferences of the user, it is necessary to differentiate from the conventional simple refrigerated storage function and require differentiated storage functions such as meat, fish, vegetables, and kimchi. It was preserved in a circular state.

Thus, the refrigerator which preserves food (for example, fresh meat, aquatic products, etc.) in a circular state is the refrigerator which possesses the high voltage processing function disclosed by Unexamined-Japanese-Patent No. 06-323721.

The refrigerator disclosed in the publication improves storage quality and thawing quality of meat or fish and shellfish by preventing deterioration of foods stored in the battlefield by applying a high voltage to the shelf where the food is placed, using part or all of the freezer compartment as the battlefield. It was made.

At this time, since a high voltage is applied to the shelf where the food is placed, there is a risk of electric shock when a person contacts the shelf where the high voltage is applied. Therefore, the conventional refrigerator detects the opening and closing state of the door as a safety device according to the risk of electric shock, and blocks the high voltage when the electric treatment chamber door is opened, and applies the high voltage when the electric treatment chamber door is closed.

However, the conventional safety device of the refrigerator may be exposed to high voltage when a person manipulates the door switch while the door is open, and may also be exposed to high voltage even when the door switch is broken.

Therefore, the present invention is to solve the conventional problems as described above, an object of the present invention is to provide a refrigerator and its safety control method that can ensure the safety by blocking the high voltage when the door switch failure or a person contacts the shelf. To provide.

Another object of the present invention, in addition to detecting the opening and closing state of the door to provide a refrigerator and its safety control method that can ensure the safety by applying a high voltage only when the internal temperature is lowered below a certain temperature by detecting the actual internal temperature. It is.

It is still another object of the present invention to provide a refrigerator and a safety control method thereof, in which a food placed on a shelf to which high voltage is applied breaks the inner wall and insulation of a storage compartment and blocks a high voltage to secure safety when a current exceeding a set value is detected. have.

Still another object of the present invention is to provide a refrigerator and a safety control method thereof, which display a state of operation according to the interruption of high voltage so that a user can recognize the same.

In order to achieve the above object, the present invention provides a control method of a refrigerator for preserving food by supplying a high voltage inside a storage compartment for storing food, the method comprising: detecting a current value of a high voltage power supplied to the storage compartment; And comparing the detected current value with a predetermined setting value and cutting off the high voltage supplied to the inside of the storage chamber when the current value is equal to or greater than the predetermined value.

In addition, the present invention provides a control method of a refrigerator for preserving food by supplying a high voltage inside a storage room for storing food, the method comprising: detecting whether the storage door is open; And blocking the high voltage supplied to the inside of the storage compartment when the storage compartment door is opened.

In addition, the present invention provides a control method of a refrigerator for preserving food by supplying a high voltage inside a storage compartment for storing food, the method comprising: detecting the inside temperature of the storage compartment; And comparing the sensed internal temperature with a predetermined set temperature to block the high voltage supplied to the inside of the storage compartment when the internal temperature is above a predetermined temperature.

In addition, the present invention provides a control method of a refrigerator for preserving food by supplying a high voltage inside a storage compartment for storing food, the method comprising: determining whether a person has approached the interior of the storage compartment; And blocking a high voltage supplied to the inside of the storage compartment when a person approaches the inside of the storage compartment.

The present invention may further include displaying an operation state of the refrigerator according to the cutoff of the high voltage supplied to the inside of the storage compartment.

In addition, the storage compartment is characterized in that the shelf on which the food is placed.

In addition, the present invention provides a control method of a refrigerator having a storage compartment for storing food, the method comprising: sensing the inside temperature of the storage compartment; Generating a high voltage when the internal temperature is lower than the predetermined temperature by comparing the detected internal temperature with a predetermined temperature; Preserving food by supplying the generated high voltage to the storage compartment; Determining whether a high voltage blocking condition occurs while supplying a high voltage into the storage chamber; And blocking a high voltage supplied to the inside of the storage compartment when a high voltage blocking condition occurs.

The high voltage blocking condition may include detecting a current value of a high voltage power supplied to a storage chamber and detecting a current value that is greater than or equal to a predetermined set value; When the storeroom door is opened; It is characterized in that at least one of a case where the internal temperature rises by a predetermined temperature or more than the set temperature; and when a person approaches the storage compartment.

In addition, the present invention provides a refrigerator having a storage compartment for storing food, the refrigerator comprising: a high voltage generator for generating a high voltage supplied inside the storage compartment; A power switch for switching driving power of the high voltage generator; A temperature sensor for sensing the inside temperature of the storage compartment; And a controller for comparing the sensed internal temperature with a predetermined set temperature to control the power switch to supply the high voltage generated by the high voltage generator to the inside of the storage compartment when the internal temperature is less than the predetermined temperature.

The controller may control the power switch to cut off the driving power supplied to the high voltage generating unit when the internal temperature rises above a predetermined temperature while supplying the high voltage into the storage compartment.

The present invention may further include a current detector for detecting a current value of the high voltage power supplied into the storage chamber, and wherein the controller compares the detected current value with a predetermined setting value, when the current value is greater than or equal to the predetermined value. By controlling the power switch to cut off the driving power supplied to the high voltage generator.

The present invention may further include a door switch interlocked with opening and closing of the storage compartment door and detecting a door opening and closing, wherein the controller controls the power switch to supply the high voltage generator when the door is opened by the door switch. It is characterized in that the drive power cut off.

The present invention may further include a detector configured to detect whether a person approaches the inside of the storage room, and the controller controls the power switch to detect a person having approached the inside of the storage room by controlling the power switch. It characterized in that the driving power supply is cut off.

In addition, the detection unit is characterized in that at least one of the touch sensor, proximity sensor, infrared sensor, touch sensor.

The present invention may further include a display unit displaying an operation state of the refrigerator according to the cutoff of the driving power supplied to the high voltage generator.

The controller may determine whether a high voltage blocking condition occurs while supplying a high voltage to the storage compartment, and cut off the high voltage supplied to the storage chamber when the high voltage blocking condition occurs.

The high voltage blocking condition may include detecting a current value of a high voltage power supplied to a storage chamber and detecting a current value that is greater than or equal to a predetermined set value; When the storeroom door is opened; It is characterized in that at least one of a case where the internal temperature rises by a predetermined temperature or more than the set temperature; and when a person approaches the storage compartment.

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

1 is a front view of a refrigerator according to the present invention, and FIG. 2 is a partial perspective view of FIG. 1.

In FIG. 1, the refrigerator of the present invention has a main body 10 in which a storage compartment 12 is formed to increase food preservation by using a high voltage, and a door 14 that opens and closes an open front surface of the storage compartment 12. And a door switch 16 interlocked with the opening and closing of the door 14 to detect the opening and closing of the door 14 inside the storage chamber 12 in contact with the door 14.

In addition, the upper part of the main body 10 is provided with a machine room 18 partitioned into a separate space, the machine room 18 is provided with a high voltage generating unit 20 for generating a high voltage.

The storage compartment 12 is divided up and down by a plurality of shelves 22 so that food can be placed on each shelf 22, and a temperature sensor 24 for detecting a high temperature inside a wall of the storage compartment 12. ) Is installed.

The shelf 22 is disposed on the rear side of the storage chamber 12 so that one end thereof is in contact with the power supply line 26 connected to the high voltage generator 20 so that the high voltage generated by the high voltage generator 20 is applied. The shelf 22 is preferably made of a conductive material so that a high voltage can be easily applied. A cover made of an insulating material is provided on the outer surface of the power supply line 26 to prevent the power supply line 26 from directly contacting the main body 10.

In addition, in order to prevent safety accidents caused by human contact as the high voltage is applied to the shelf 22, a contact sensor 28 may be installed so that the door switch 16 may fail or a person may arbitrarily manipulate the door switch 16. Even if a person contacts the shelf 22 to ensure safety from the high voltage applied to the shelf 22.

Meanwhile, in the present invention, the touch sensor 28 is described as an example to detect whether a person contacts the shelf 22. However, the present invention is not limited thereto, and a person may use a shelf using a proximity sensor, an infrared sensor, or a touch sensor. It may be detected whether or not it comes in contact with (22).

In addition, the shelf 22 is accommodated to be spaced apart from the inner wall 12a of the storage compartment 12 in the interior of the storage compartment 12, as shown in Figure 2, the main body 10, that is, the storage compartment 12 The support wall 30 for supporting the four corners of the shelf 22 is installed on the inner wall 12a of the high voltage generating unit 20 between the shelf 22 and the support unit 30 supported by the support unit 30. The insulating member 32 is installed to prevent the high voltage applied from the power supply to the main body 10 through the support part 30. That is, the insulating member 32 is provided in the upper surface of the support part 30, and the shelf 22 is supported by the upper surface of this insulating member 32. FIG.

Although not shown in the drawing, a conventional cooling system in which the refrigerant is circulated is applied to the refrigerator, and thus, the cool air generated by absorbing ambient heat when the liquid refrigerant evaporates is supplied to the storage compartment 12. Compressors, condensers, expansion valves and evaporators for refrigeration or freezing of various foods are arranged.

3 is a safety control block diagram of a refrigerator according to a first embodiment of the present invention, in addition to the components shown in FIGS. 1 and 2, the fuse 52 connected to the commercial power source 50, the high voltage generator 20, And a resistor 54, a current detector 56, a signal converter 58, a controller 60, a power driver 62, a power switch 64, a display 66 and an input 68.

The fuse 52 is an overload protection circuit that cuts off an abnormal current flowing in an electric circuit by melting and cutting off a current over a predetermined time in a power line supplied with power through a commercial power supply 50.

The high voltage generation unit 20 is a high voltage transformer for generating a high voltage (about 5 ~ 10 kW) by boosting the AC power supplied through the commercial power supply 50, the generated high voltage is stored in the storage room through the power supply line 26 (12) Supplied to the inner shelf 22, the resistor 54 is connected to the secondary side of the high voltage generator 20 to limit the current component of the high voltage power supply to the shelf 22.

The current detector 56 is a CT sensor connected to the secondary side of the high voltage generator 20 to detect a current input to the shelf 22, and the food placed on the shelf 22 to which the high voltage is applied is stored in the storage compartment 12. When the inner wall 12a and the insulation are broken to detect a current higher than the set value, the high voltage generator 20 blocks the high voltage generation.

The signal converter 58 is an AC / DC converter that converts an AC component of the input current detected by the current detector 56 into a direct current and inputs it to the controller 60.

The control unit 60 is a microcomputer that controls the overall operation of the refrigerator. The control unit 60 receives signals from the door switch 16, the temperature sensor 24, the contact sensor 34, and the current detector 56. Control the power supplied to

In more detail, the control unit 60 blocks the high voltage applied to the shelf 22 when the door 14 is opened according to the door open / close detection signal of the door switch 16, and the shelf when the door 14 is closed. The power supplied to the high voltage generator 20 is controlled so that a high voltage is applied to the 22.

In addition, the control unit 60 detects the opening / closing state of the door 14 and senses the actual internal temperature by the temperature sensor 24 so that a high voltage is applied only when the internal temperature falls below a user set temperature. The power supplied to the unit 20 is controlled.

In addition, the control unit 60 is a high voltage is detected when a person's contact to the shelf 22 is detected by the contact sensor 34 in case the door switch 16 is broken or a person operates the door switch 16 arbitrarily. Control the power supplied to the high voltage generator 20 to be cut off.

In addition, the control unit 60 is a high voltage when the current is detected by the current detector 56 when the food is placed on the shelf 22 is applied to the inner wall 12a of the storage compartment 12 breakage of the insulation is broken. The power supplied to the high voltage generation unit 20 is controlled to be blocked.

The power driver 62 is a driving circuit composed of transistors, triacs, etc. to cut off or apply power supplied to the primary side of the high voltage generator 20 according to a control signal of the controller 60, and the power switch 64. ) Is a power relay for cutting off or applying the commercial power supply 50 supplied to the high voltage generation unit 20 according to the driving of the power supply driving unit 62.

The display unit 66 displays the operation state of the high voltage generator 20 according to the power cutoff according to the control signal of the controller 60 so that the user can recognize the operation state.

The input unit 68 inputs a user control command to the control unit 60. After placing the food on the shelf 22 of the storage chamber 12, a start button for starting temperature control and preservation control, and to preserve food Many buttons are provided, such as a temperature setting button for setting to the temperature.

4 is a safety control block diagram of a refrigerator according to a second embodiment of the present invention, in which all configurations are the same as those of FIG. 3, but high voltages are generated on the secondary ground line of the high voltage generator 20 connected to the current detector 56. Inserted into the module of the unit 20 and configured separately from the ground line of the storage compartment 12, the same purpose and effect as in FIG. 3 can be achieved even if one line of the secondary side of the high voltage generator 20 is inserted into the module.

Hereinafter, the operation process and the effect of the refrigerator and the safety control method configured as described above will be described.

5A and 5B are flowcharts illustrating operations of a safety control method of a refrigerator according to the present invention.

First, after placing the food to be stored by the user on the shelf 22 of the storage compartment 12 (S100), by operating the temperature setting button provided in the input unit 68 to input the set temperature (Ts) to preserve the food. (S102).

When the set temperature Ts is input, the controller 60 determines whether a cooling start signal is input through the start button provided in the input unit 68 (S104), and when the start button is input, the controller 60 controls the refrigerant into the refrigerator. Supplying cold air generated in accordance with the normal cooling system operation in which the cycle is circulated to start the temperature control for refrigeration or freezing the food placed on the shelf 22 to the set temperature (Ts).

Subsequently, the controller 60 detects the inside temperature Tc of the storage compartment 12 that changes according to the driving of the cooling system through the temperature sensor 24 (S108), and sets the detected inside temperature Tc to the set temperature Ts. Compared with (S110).

As a result of the comparison, if the high temperature Tc is not above the set temperature Ts, the temperature control is continued until the high temperature Tc falls below the set temperature Ts, and the high temperature Tc is the set temperature Ts. ), The high voltage control is started to keep the food in a circular state for a long time (test result, about 1 month).

To this end, the controller 60 turns on the power switch 64 through the power driver 62 so that the commercial power 50 is supplied to the primary side of the high voltage generator 20.

When the commercial power supply 50 is supplied to the primary side of the high voltage generator 20, a high voltage of about 5 to 10 kW is generated on the secondary side of the high voltage generator 20 (S112). The high voltage generated on the secondary side is applied to the shelf 22 through the power supply line 26 disposed in the rear of the storage compartment 12 to control the high voltage of the food placed on the shelf 22 (S114).

Since the preservation performance of food using high voltage is disclosed in a refrigerator possessing a high voltage processing function disclosed in Japanese Patent Application Laid-Open No. 06-323721, detailed descriptions will be omitted, and hereinafter, to secure safety from high voltage applied to the shelf 22. It will be described in detail with respect to the technical features of the present invention.

First, when a high voltage is applied to the shelf 22 and the current Ic input to the shelf 22 is detected by the current detector 56 (S116), the AC component of the detected input current Ic is converted into a signal converter ( 58 is converted into direct current and input to the controller 60.

Accordingly, the controller 60 determines whether the detected current value Ic is equal to or greater than the predetermined set value Is (S118), and when the detected current value Ic is not equal to or greater than the set value Is, a high voltage is applied. It is determined that the insulation of the shelves 22 and the inner wall 12a of the storage chamber 12 has not been destroyed, and the generation of high voltage is continued.

On the other hand, when the detected current value Ic is greater than or equal to the set value Is, the controller 60 determines that the food placed on the shelf 22 to which the high voltage is applied has touched the inner wall 12a of the storage compartment 12 so that the insulation is broken. By controlling the power drive unit 62 to turn off the power switch 64 to block the commercial power supply 50 supplied to the high voltage generator 20 to block the high voltage generation (S126). This is safe from the high voltage applied to the shelf 22 when the insulation of the shelf 22 and the inner wall 12a of the storage chamber 12 is broken and a current value Ic above the set value Is is detected by the current detector 56. To secure.

In addition, the controller 60 determines whether the door 14 is opened through the door switch 16 (S120), and if the door 14 is not opened, the high voltage generation is continued, and when the door 14 is opened, the controller 60 is controlled. By controlling the power driver 62, the power switch 64 is turned off to block the commercial power supply 50 supplied to the high voltage generator 20 to block high voltage generation (S126). This is to ensure the safety from the high voltage applied to the shelf 22 by blocking the generation of high voltage when the door 14 is open.

In addition, the control unit 60 detects the current detection due to insulation breakdown or the opening / closing state of the door 14, and also detects the actual internal temperature Tc through the temperature sensor 24. It is determined whether the predetermined temperature (R; about 2 to 3 ° C.) or more is higher than the set temperature (Ts) (S122). Continue.

On the other hand, when the high internal temperature Tc is a predetermined temperature R or more than the set temperature Ts, the controller 60 controls the power driver 62 to turn off the power switch 64 to the high voltage generator 20. Blocking the supplied commercial power supply 50 blocks the high voltage generation (S126). This is a safety device that checks a change in the actual internal temperature Tc in case of failure of the door switch 16 or a user arbitrarily operating the door switch 16.

In addition, the controller 60 determines whether a person has touched the shelf through the contact sensor 28 (S124), and if the person has not touched the shelf, the controller 60 feeds back to S114.

On the other hand, when a person is in contact with the shelf by controlling the power drive unit 62 to turn off the power switch 64 to cut off the high voltage generation by cutting off the commercial power supply 50 supplied to the high voltage generator 20 (S126). . This is a safety device in case of failing to check the change in the internal temperature because the change in the actual internal temperature Tc is minute in addition to the failure of the door switch 16 or the user arbitrarily operating the door switch 16.

In this way, when the insulation between the shelf 22 and the inner wall 12a of the storage chamber 12 is broken and a current value Ic of the set value Is or more is detected by the current detector 56, the door 14 is opened. If the actual high temperature Tc rises above the set temperature Ts by a predetermined temperature or when one of the four conditions, such as when a person contacts the shelf 22, satisfies any one of the four conditions, the controller 60 controls the shelf 22. In order to ensure safety from the high voltage applied to the high-voltage generator 20 is to cut off the high voltage generation by cutting off the commercial power supply (50).

Subsequently, the controller 60 displays the operation state of the refrigerator according to the cutoff of the high voltage through the display unit 68 (S128).

As described above, according to the refrigerator and the safety control method according to the present invention, when a door switch failure or a person contacts the shelf, there is an effect that the high voltage can be cut off to ensure safety.

In addition, the present invention, in addition to detecting the opening and closing state of the door to detect the actual high temperature inside the high temperature is applied only when the temperature is lowered below a certain temperature, the food placed on the shelf to which the high voltage is applied, the storage chamber inner wall and insulation is destroyed Therefore, when current over the set value is detected, high voltage can be cut off to ensure safety.

In addition, the present invention displays the operating state according to the blocking of the high voltage to enable the user to recognize.

Claims (17)

In the control method of the refrigerator for preserving food by supplying a high voltage inside the storage compartment for storing food, Detecting a current value of a high voltage power supplied to the storage compartment; And Comparing the detected current value with a predetermined setting value and cutting off the high voltage supplied to the inside of the storage chamber when the current value is equal to or greater than the predetermined value; Safety control method of a refrigerator comprising. In the control method of the refrigerator for preserving food by supplying a high voltage inside the storage compartment for storing food, Detecting whether the storage door is open; And Cutting off a high voltage supplied to the inside of the storage compartment when the storage compartment door is opened; Safety control method of a refrigerator comprising. In the control method of the refrigerator for preserving food by supplying a high voltage inside the storage compartment for storing food, Sensing the inside temperature of the storage compartment; And Comparing the sensed internal temperature with a predetermined set temperature and blocking the high voltage supplied to the inside of the storage compartment when the internal temperature is above a predetermined temperature; Safety control method of a refrigerator comprising. In the control method of the refrigerator for preserving food by supplying a high voltage inside the storage compartment for storing food, Determining whether a person has accessed the storage compartment; And Blocking a high voltage supplied to the inside of the storage room when a person approaches the inside of the storage room; Safety control method of a refrigerator comprising. The method according to any one of claims 1 to 4, And displaying the operation state of the refrigerator according to the cutoff of the high voltage supplied to the inside of the storage compartment. The method according to any one of claims 1 to 4, The inside of the storage compartment is a safety control method for a refrigerator, characterized in that the shelf on which the food is placed. In the control method of the refrigerator having a storage compartment for storing food, Sensing the inside temperature of the storage compartment; Generating a high voltage when the internal temperature is lower than the predetermined temperature by comparing the detected internal temperature with a predetermined temperature; Preserving food by supplying the generated high voltage to the storage compartment; Determining whether a high voltage blocking condition occurs while supplying a high voltage into the storage chamber; And Blocking a high voltage supplied to the storage compartment when a high voltage blocking condition occurs; Safety control method of a refrigerator comprising. The method of claim 7, wherein The high voltage blocking condition, Detecting a current value of a high voltage power supply supplied to a storage chamber and detecting a current value that is greater than or equal to a predetermined set value; When the storeroom door is opened; The internal temperature rises above a set temperature by a certain temperature; and When a person is inside the storeroom; Safety control method of the refrigerator, characterized in that at least one. In the refrigerator having a storage room for storing food, A high voltage generator for generating a high voltage supplied into the storage chamber; A power switch for switching driving power of the high voltage generator; A temperature sensor for sensing the inside temperature of the storage compartment; A control unit for comparing the detected internal temperature with a predetermined set temperature and controlling the power switch to supply a high voltage generated by a high voltage generator to a storage compartment when the internal temperature is less than a predetermined temperature; Including refrigerator. The method of claim 9, The controller may control the power switch to cut off the driving power supplied to the high voltage generating unit when the internal temperature rises above a predetermined temperature while supplying the high voltage into the storage compartment. The method of claim 9, Further comprising a current detecting unit for detecting the current value of the high voltage power supplied to the storage chamber, And the control unit compares the detected current value with a predetermined setting value, and controls the power switch to cut off the driving power supplied to the high voltage generator when the current value is equal to or larger than the predetermined setting value. The method of claim 9, Further comprising a door switch for interlocking the opening and closing of the storage door to detect the opening and closing of the door, And the control unit controls the power switch to cut off the driving power supplied to the high voltage generator when the door is opened by the door switch. The method of claim 9, Further comprising a detector for detecting whether a person approached the inside of the storage compartment, And the control unit controls the power switch to cut off the driving power supplied to the high voltage generator when it is detected by the detector that the person approaches the inside of the storage compartment. The method of claim 13, The detector is at least one of a touch sensor, a proximity sensor, an infrared sensor, a touch sensor. The method according to any one of claims 10 to 13, And a display unit which displays an operation state of the refrigerator according to the cutoff of the driving power supplied to the high voltage generator. The method of claim 9, The controller determines whether a high voltage blocking condition occurs while supplying a high voltage into the storage compartment, and when the high voltage blocking condition occurs, cuts off the high voltage supplied to the storage chamber. The method of claim 16, The high voltage blocking condition, Detecting a current value of a high voltage power supply supplied to a storage chamber and detecting a current value that is greater than or equal to a predetermined set value; When the storeroom door is opened; The internal temperature rises above a set temperature by a certain temperature; and When a person is inside the storeroom; At least one refrigerator.

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