EP4148355A1 - Réfrigérateur - Google Patents

Réfrigérateur Download PDF

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Publication number
EP4148355A1
EP4148355A1 EP21799931.7A EP21799931A EP4148355A1 EP 4148355 A1 EP4148355 A1 EP 4148355A1 EP 21799931 A EP21799931 A EP 21799931A EP 4148355 A1 EP4148355 A1 EP 4148355A1
Authority
EP
European Patent Office
Prior art keywords
operation mode
defrost
temperature
heater
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21799931.7A
Other languages
German (de)
English (en)
Other versions
EP4148355A4 (fr
Inventor
Youngseung SONG
Kyongbae Park
Yunsu Cho
Sangbok Choi
Namsoo Cho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020200054354A external-priority patent/KR20210136306A/ko
Priority claimed from KR1020200054351A external-priority patent/KR20210136303A/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP4148355A1 publication Critical patent/EP4148355A1/fr
Publication of EP4148355A4 publication Critical patent/EP4148355A4/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Definitions

  • the present disclosure relates to a refrigerator, and more particularly, to a refrigerator capable of improving defrosting efficiency and power consumption.
  • a refrigerator temperature is reduced using a compressor and an evaporator.
  • a freezer compartment in the refrigerator is maintained at a temperature of approximately -18°C.
  • Prior Document 1 Korean Patent Application Laid-Open No. 10-2001-0026176 (hereinafter, referred to as Prior Document 1) relates to a method for controlling a defrost heater of a refrigerator, in which the defrost heater is turned on when a certain time for defrosting arrives, and turned off after the lapse of a certain period of time.
  • U.S. Patent Publication No. US6694754 (hereinafter, referred to as Prior Document 2) relates to a refrigerator having a pulse-based defrost heater, disclosing that the On and off time of a defrost heater is determined based on time.
  • Prior Document 3 Korean Patent Application Laid-Open No. 10-2016-0053502 (hereinafter, referred to as Prior Document 3) relates to a defrosting device, a refrigerator having the same, and a control method of the defrosting device, in which the On and off time of a defrost heater determined based on time or time and temperature.
  • An aspect of the present disclosure provides a refrigerator capable of improving defrosting efficiency and power consumption.
  • Another aspect of the present disclosure provides a refrigerator capable of performing a continuous operation mode again after a pulse operation mode of a defrost heater.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode, perform a continuous operation mode, in which the defrost heater is continuously turned on, and a pulse operation mode, in which the defrost heater is repeatedly turned on and off based on the defrost operation mode, and is configured to perform the continuous operation mode again after performing the pulse operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the continuous operation mode.
  • the controller may be configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, and perform the continuous operation mode of the defrost heater, and the pulse operation mode, in which the defrost heater is repeatedly turned on and off, based on the heater operation mode.
  • the controller may be configured to continuously turn on the defrost heater based on the continuous operation mode, in response to a change rate of the ambient temperature of the evaporator detected by the temperature sensor being greater than or equal to a first reference value in an ON state of the defrost heater, enter the pulse operation mode and turn off the defrost heater, and in response to the change rate of the ambient temperature of the evaporator being less than or equal to a second reference value less than the first reference value in a state in which the defrost heater is turned off during the pulse operation mode, turn on the defrost heater.
  • the controller may be configured to continuously turn on the defrost heater based on the continuous operation mode, and repeatedly turn on and off the defrost heater for the change rate of the ambient temperature of the evaporator to be between the first reference value and the second reference value based on the pulse operation mode.
  • the controller may be configured to, as the number of opening times of the cooling compartment door increases, decrease a duration of the defrost operation mode.
  • the controller may be configured to control a peak temperature arrival time point of the evaporator in response to the continuous operation mode and the pulse operation mode being performed to be later than the peak temperature arrival time point of the evaporator in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • the controller may be configured to control a size of a second section related to temperature versus time between a phase-change temperature and the defrost end temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than a size of a first section related to temperature versus time between the phase-change temperature and the defrost end temperatures only in response to the defrost heater being continuously turned on in the defrost operation mode.
  • the controller may be configured to control an effective defrost in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than the effective defrost in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • the controller may be configured to control a heater OFF time point in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the heater OFF time point in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • the controller may be configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, perform the pulse operation mode in which the defrost heater is repeatedly turned on and off, and in response to the period during which the temperature detected by the temperature sensor reaching the first temperature while performing the continuous operation mode is greater than or equal to a second period greater than the first period, continuously perform the continuous operation mode.
  • the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, perform the pulse operation mode in which the defrost heater is repeatedly
  • a refrigerator in another aspect, includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode, perform a continuous operation mode, in which the defrost heater is continuously turned on, and a pulse operation mode, in which the defrost heater is repeatedly turned on and off based on the defrost operation mode, and in response to a return condition to the continuous operation mode of the defrost heater arriving while performing the pulse operation mode, perform the continuous operation mode again.
  • a refrigerator in further another aspect, includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, perform the pulse operation mode in which the defrost heater is repeatedly turned on and off, and in response to the period during which the temperature detected by the temperature sensor reaching the first temperature while performing the continuous operation mode is greater than or equal to a second period greater than the first period, continuously perform the continuous operation mode.
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off.
  • the controller may be configured to control an OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching a second temperature higher than the first temperature between the first period and the second period to be greater than the OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature within the first period.
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off.
  • the controller may be configured to control an OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature between the first period and the second period to be greater than the OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature within the first period.
  • the controller may be configured to, as the change rate of the temperature detected by the temperature sensor decreases while performing the continuous operation mode, increase a delay of a start time point of the pulse operation mode.
  • the controller may be configured to, as the change rate of the temperature detected by the temperature sensor decreases while performing the continuous operation mode, increase the duration of the pulse operation mode.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode, perform a continuous operation mode, in which the defrost heater is continuously turned on, and a pulse operation mode, in which the defrost heater is repeatedly turned on and off based on the defrost operation mode, and is configured to perform the continuous operation mode again after performing the pulse operation mode. Accordingly, the present disclosure can improve a defrosting efficiency and reduce power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller may be configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, and control the continuous operation mode of the defrost heater and the pulse operation mode, in which the defrost heater is repeatedly turned on and off, to be performed based on the heater operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to continuously turn on the defrost heater based on the continuous operation mode, and enter the pulse operation mode and turn off the defrost heater in response to the change rate of the ambient temperature of the evaporator detected by the temperature sensor being greater than or equal to the first reference value in the ON state of the defrost heater, and turn on the defrost heater in response to the change rate of the ambient temperature of the evaporator being less than or equal to the second reference value less than the first reference value in the state in which the defrost heater is turned off during the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to turn off the defrost heater based on the heater pulse operation end condition. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to continuously turn on the defrost heater based on the continuous operation mode, and repeatedly turn on and off the defrost heater for the change rate of the temperature around the evaporator being between the first reference value and the second reference value based on the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to perform the pulse operation mode. Accordingly, the present disclosure can improve a defrosting efficiency and reduce power consumption.
  • the controller may be configured to perform the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to perform the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to perform the pulse operation mode based on the temperature change rate of the temperature detected by the temperature sensor. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to operate the heater with power inversely proportional to the temperature change rate of the temperature detected by the sensor during the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to, as the number of opening times of the cooling compartment door increases, decrease the duration of the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a peak temperature arrival point of the evaporator in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than a peak temperature arrival point of the evaporator in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, defrosting efficiency may be improved and power consumption may be improved.
  • the controller may be configured to control a size of a second section related to a temperature versus time between a phase-change temperature and a defrost end temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than a size of a first section related to a temperature versus time between the phase-change temperature and the defrost end temperature in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, defrosting efficiency may be improved and power consumption may be improved.
  • the controller may be configured to control an effective defrost in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than an effective defrost in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, defrosting efficiency may be improved and power consumption may be improved.
  • the controller may be configured to control a heater OFF time point in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than a heater OFF time point in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, defrosting efficiency may be improved and power consumption may be improved.
  • the controller may be configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, perform the pulse operation mode in which the defrost heater is repeatedly turned on and off, and in response to the period during which the temperature detected by the temperature sensor reaching the first temperature while performing the continuous operation mode is greater than or equal to a second period greater than the first period, continuously perform the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode, perform a continuous operation mode, in which the defrost heater is continuously turned on, and a pulse operation mode, in which the defrost heater is repeatedly turned on and off based on the defrost operation mode, and in response to a return condition to the continuous operation mode of the defrost heater arriving while performing the pulse operation mode, perform the continuous operation mode again. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, wherein, in response to a defrosting operation start time point arriving, the controller is configured to perform the defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, in response to the temperature detected by the temperature sensor reaching the first temperature within a first period during the continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, perform the pulse operation mode in which the defrost heater is repeatedly turned on and off, and in response to the period during which the temperature detected by the temperature sensor reaching the first temperature while performing the continuous operation mode is greater than or equal to a second period greater than the first period, continuously perform the continuous operation mode.
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control an OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching a second temperature higher than the first temperature between the first period and the second period to be greater than the OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature within the first period. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control an OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature between the first period and the second period to be greater than the OFF period of the defrost heater before performing the pulse operation mode in response to the temperature detected by the temperature sensor reaching the first temperature within the first period. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to, as the change rate of the temperature detected by the temperature sensor decreases while performing the continuous operation mode, increase a delay of a start time point of the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to, as the change rate of the temperature detected by the temperature sensor decreases while performing the continuous operation mode, increase the duration of the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 1 is a perspective view illustrating a refrigerator according to an embodiment of the present disclosure.
  • a refrigerator 100 forms a rough outer shape by a case 110 having an internal space divided, although not shown, into a freezer compartment and a refrigerating compartment, a freezer compartment door 120 that shields the freezer compartment, and a refrigerator door 140 to shield the refrigerating compartment.
  • the front surface of the freezer compartment door 120 and the refrigerating compartment door 140 is further provided with a door handle 121 protruding forward, so that a user easily grips and rotates the freezer compartment door 120 and the refrigerating compartment door 140.
  • the front surface of the refrigerating compartment door 140 may be further provided with a home bar 180 which is a convenient means for allowing a user to take out a storage such as a beverage contained therein without opening the refrigerating compartment door 140.
  • the front surface of the freezer compartment door 120 may be provided with a dispenser 160 which is a convenient means for allowing the user to easily take out ice or drinking water without opening the freezer compartment door 120, and a control panel 210 for controlling the driving operation of the refrigerator 100 and displaying the state of the refrigerator 100 being operated on a screen may be further provided in an upper side of the dispenser 160.
  • the dispenser 160 is disposed in the front surface of the freezer compartment door 120, but is not limited thereto, and may be disposed in the front surface of the refrigerating compartment door 140.
  • the control panel 210 may include an input device 220 formed of a plurality of buttons, and a display device 230 for displaying a control screen, an operation state, and the like.
  • the display device 230 displays information such as a control screen, an operation state, a temperature inside the refrigerator, and the like.
  • the display device 230 may display the set temperature of the freezer compartment and the set temperature of the refrigerating compartment.
  • the display device 230 may be implemented in various ways, such as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), and the like.
  • the display device 230 may be implemented as a touch screen capable of serving as the input device 220.
  • the input device 220 may include a plurality of operation buttons.
  • the input device 220 may include a freezer compartment temperature setting button (not shown) for setting the freezer compartment temperature, and a refrigerating compartment temperature setting button (not shown) for setting the refrigerating compartment temperature.
  • the input device 220 may be implemented as a touch screen that may also function as the display device 230.
  • the refrigerator according to an embodiment of the present disclosure is not limited to a double door type shown in the drawing, but may be a one door type, a sliding door type, a curtain door type, and the like regardless of its type.
  • FIG. 2 is a perspective view of a door of the refrigerator of FIG. 1 .
  • a freezer compartment 155 is disposed inside the freezer compartment door 120, and a refrigerating compartment 157 is disposed inside the refrigerating compartment door 140.
  • FIG. 3 is a view schematically illustrating a configuration of the refrigerator of FIG. 1 .
  • the refrigerator 100 may include a compressor 112, a condenser 116 for condensing a refrigerant compressed by the compressor 112, a freezer compartment evaporator 122 which is supplied with the refrigerant condensed in the condenser 116 to evaporate, and is disposed in a freezer compartment (not shown), and a freezer compartment expansion valve 132 for expanding the refrigerant supplied to the freezer compartment evaporator 122.
  • the refrigerator 100 may further include a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown), a three-way valve (not shown) for supplying the refrigerant condensed in the condenser 116 to the refrigerating compartment evaporator (not shown) or the freezer compartment evaporator 122, and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown).
  • a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown)
  • a three-way valve for supplying the refrigerant condensed in the condenser 116 to the refrigerating compartment evaporator (not shown) or the freezer compartment evaporator 122
  • a refrigerating compartment expansion valve not shown
  • the refrigerator 100 may further include a gas-liquid separator (not shown) which separates the refrigerant passed through the evaporator 122 into a liquid and a gas.
  • a gas-liquid separator (not shown) which separates the refrigerant passed through the evaporator 122 into a liquid and a gas.
  • the refrigerator 100 may further include a refrigerating compartment fan (not shown) and a freezer compartment fan 144 that suck cold air that passed through the freezer compartment evaporator 122 and blow the sucked cold air into a refrigerating compartment (not shown) and a freezer compartment (not shown) respectively.
  • the refrigerator 100 may further include a compressor driver 113 for driving the compressor 112, and a refrigerating compartment fan driver (not shown) and a freezer compartment fan driver 145 for driving the refrigerating compartment fan (not shown) and the freezer compartment 144.
  • a damper (not shown) may be installed between the refrigerating compartment and the freezer compartment, and a fan (not shown) may forcibly blow the cold air generated in one evaporator to be supplied to the freezer compartment and the refrigerating compartment.
  • FIG. 4 is a block diagram schematically illustrating the inside of the refrigerator shown in FIG. 1 .
  • the refrigerator of FIG. 4 includes a compressor 112, a machine room fan 115, the freezer compartment fan 144, a controller 310, a heater 330, a temperature sensor 320, and a memory 240, and an evaporator 122.
  • the refrigerator may further include a compressor driver 113, a machine room fan driver 117, a freezer compartment fan driver 145, a heater driver 332, a display device 230, and an input device 220.
  • the compressor 112 the machine room fan 115, and the freezer compartment fan 144 are described with reference to FIG. 2 .
  • the input device 220 includes a plurality of operation buttons, and transmits a signal for an input freezer compartment set temperature or refrigerating compartment set temperature to the controller 310.
  • the display device 230 may display an operation state of the refrigerator. Meanwhile, the display device 230 is operable under the control of a display controller (not shown).
  • the memory 240 may store data necessary for operating the refrigerator.
  • the memory 240 may store power consumption information for each of the plurality of power consumption devices. In addition, the memory 240 may output corresponding power consumption information to the controller 310 based on the operation of each power consumption device in the refrigerator.
  • the temperature sensor 320 detects a temperature in the refrigerator and transmits a signal for the detected temperature to the controller 310.
  • the temperature sensor 320 detects the refrigerating compartment temperature and the freezer compartment temperature respectively.
  • the temperature of each chamber in the refrigerating compartment or each chamber in the freezer compartment may be detected.
  • the controller may control the compressor driver 113, the fan driver 117 or 145, the heater driver 332 to eventually control the compressor 112, the fan 115 or 144, and the heater 330.
  • the fan driver may be the machine room fan driver 117 or the freezer compartment fan driver 145.
  • the controller 310 may output a corresponding speed command value signal to the compressor driver 113 or the fan driver 117 or 145 respectively.
  • the compressor driver 113 and the freezer compartment fan driver 145 described above are provided with a compressor motor (not shown) and a freezer compartment fan motor (not shown) respectively, and each motor (not shown) may be operated at a target rotational speed under the control of the controller 310.
  • the machine room fan driver 117 includes a machine room fan motor (not shown), and the machine room fan motor (not shown) may be operated at a target rotational speed under the control of the controller 310.
  • each motor may be controlled by a switching operation in an inverter (not shown) or may be controlled at a constant speed by using an AC power source intactly.
  • each motor may be any one of an induction motor, a Blush less DC (BLDC) motor, a synchronous reluctance motor (synRM) motor, and the like.
  • the controller 310 may control the overall operation of the refrigerator 100, in addition to the operation control of the compressor 112 and the fan 115 or 144.
  • the controller 310 may control the overall operation of the refrigerant cycle based on the set temperature from the input device 220.
  • the controller 310 may further control a three-way valve (not shown), a refrigerating compartment expansion valve (not shown), and a freezer compartment expansion valve 132, in addition to the compressor driver 113, the refrigerating compartment fan driver 143, and the freezer compartment fan driver 145.
  • the operation of the condenser 116 may also be controlled.
  • the controller 310 may control the operation of the display device 230.
  • the cold air heat-exchanged in the evaporator 122 may be supplied to the freezer compartment or the refrigerating compartment by a fan or a damper (not shown).
  • the heater 330 may be a freezer compartment defrost heater.
  • the freezer compartment defrost heater 330 may operate to remove frost attached to the freezer compartment evaporator 122.
  • the heater driver 332 may control the operation of the heater 330.
  • the controller 310 may control the heater driver 332.
  • the heater 330 may include a freezer compartment defrost heater and a refrigerating compartment defrost heater.
  • the freezer compartment defrost heater 330 may operates to remove frost attached to the freezer compartment evaporator 122, and the refrigerating compartment defrost heater (not shown) may operate to remove frost attached to the refrigerating compartment evaporator.
  • the heater driver 332 may control the operations of the freezer compartment defrost heater 330 and the refrigerating compartment defrost heater.
  • FIG. 5A is a perspective view illustrating an example of an evaporator related to the present disclosure
  • FIG. 5B is a diagram referenced in the description of FIG. 5A .
  • the evaporator 122 in the refrigerator 100 may be a freezer compartment evaporator as described above with reference to FIG. 2 .
  • a sensor mounter 400 including a temperature sensor 320 may be attached to the evaporator 122 in the refrigerator 100.
  • a sensor mounter 400 is attached to an upper cooling pipe of the evaporator 122 in the refrigerator 100.
  • the evaporator 122 includes a cooling pipe 131 extending from one side of the accumulator 134 and a support 133 supporting the cooling pipe 131.
  • the cooling pipe 131 may be repeatedly bent in a zigzag manner to form multiple rows and may be filled with a refrigerant.
  • the defrost heater 330 for defrosting may be disposed in the vicinity of the cooling pipe 131 of the evaporator 122.
  • the defrost heater 330 is disposed in the vicinity of the cooling pipe 131 in a lower region of the evaporator 122.
  • frost ICE is formed from a lower region of the evaporator 122 and grows in an upward direction
  • the defrost heater 330 may be disposed in the vicinity of the cooling pipe 131 in the lower region of the evaporator 122.
  • the defrost heater 330 may be disposed in a shape surrounding the cooling pipe 131 of the lower region of the evaporator 122.
  • FIG. 5B illustrates frost ICE is attached to the evaporator 122.
  • frost ICE is attached to a central portion and a lower portion of the evaporator 122.
  • frost ICE is formed on the defrost heater 330 to cover the defrost heater 330.
  • frost ICE is removed from the lower region of the evaporator 122 and may be gradually removed in the direction of the central region.
  • FIG. 6 is a flowchart illustrating a method of operating a refrigerator according to an embodiment of the present disclosure.
  • the controller 310 of the refrigerator 100 determines whether a defrosting operation start time point for defrosting arrives (S610).
  • the controller 310 of the refrigerator 100 may determine whether a defrosting operation start time point arrives while performing a normal cooling operation mode Pga.
  • the defrosting operation start time point may vary according to a defrost cycle.
  • the amount of cold air supplied in the normal cooling operation mode increases, and accordingly, a rate at which frost is formed on the evaporator 122 may increase.
  • the controller 310 of the refrigerator 100 may control such that a defrost cycle is shortened.
  • the controller 310 of the refrigerator 100 may control the defrosting operation start time point to be shortened.
  • the controller 310 of the refrigerator 100 may end the normal cooling operation mode, control to perform a defrost operation mode PDF, and control the defrost heater 330 to be continuously turned on based on a heater operation mode PddT in the defrost operation mode PDF (S615).
  • the controller 310 of the refrigerator 100 may be configured to perform a pulse operation mode in which the defrost heater 330 is repeatedly turned on and off by a heater pulse after the defrost heater 330 is continuously turned on (S620).
  • the controller 310 of the refrigerator 100 may be configured to perform the defrost operation mode PDF including a pre-defrost cooling mode Pbd, a heater operation mode PddT, and a post-defrost cooling mode pbf.
  • the controller may be configured to perform a continuous operation mode Pona in which the defrost heater 330 is continuously turned on and a pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 controls the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and in the ON state of the defrost heater 330, when a change rate of an ambient temperature of the evaporator 122 detected by the temperature sensor 320 is equal to or greater than a first reference value ref1, the controller 310 may enter the pulse operation mode Ponb to control the defrost heater 330 to be turned off. Accordingly, defrosting efficiency and power consumption may be improved.
  • the controller 310 of the refrigerator 100 may control the defrost heater 330 to be turned on and off based on a change rate of the temperature detected by the temperature sensor 320 when the pulse operation mode Ponb is performed.
  • the controller 310 of the refrigerator 100 may control the defrost heater 330 to be turned off, and if the change rate of the temperature detected by the temperature sensor 320 is less than or equal to a second reference value ref2 less than the first reference value ref1, the controller 310 may control the defrost heater 330 to be turned on. Accordingly, since defrosting may be performed based on a change rate ⁇ T of the temperature, defrosting efficiency and power consumption may be improved.
  • the controller 310 of the refrigerator 100 determines whether a pulse operation mode end time point arrives (S630), and if pulse operation mode end time point arrives, the controller 310 turns off the defrost heater 330 (S640).
  • the pulse operation mode end time point may be a time point at which the temperature detected by the temperature sensor 320 falls below a phase-change temperature Trf1.
  • the pulse operation mode end time point may be an end time point of the defrosting operation or an end time point of the heater operation mode.
  • the continuous operation mode Pona in which the defrost heater 330 is continuously turned on and the pulse operation mode in which the defrost heater 330 is repeatedly turned on and off are controlled to be performed based on the change rate of the temperature detected by the temperature sensor 320, defrosting efficiency and power consumption may be improved by performing defrosting based on the change rate ⁇ T of the temperature.
  • defrosting efficiency and power consumption may be improved.
  • FIGS. 7A to 13 are diagrams referenced in the description of FIG. 6 .
  • FIG. 7A is a diagram illustrating a defrost heater HT and a switching element RL for driving a defrost heater when one evaporator and one defrost heater are used in the refrigerator 100.
  • the freezer compartment defrost heater HT may operate to remove frost attached to the freezer compartment evaporator 122.
  • the switching element RL in the heater driver 332 may control the operation of the defrost heater HT.
  • the switching element RL may be a relay element.
  • the continuous operation mode Pona in which the defrost heater HT is continuously turned on may be performed, and when the switching element RL is switched On and off, the pulse operation mode Ponb in which the defrost heater HT is repeatedly turned on and off may be performed.
  • FIG. 7B is a diagram illustrating defrost heaters HTa and HTb and switching elements RLa and Rlb for driving the defrost heaters when two evaporators and two defrost heaters are used in the refrigerator 100.
  • a first switching element RLa in the heater driver 332 may control the operation of the first defrost heater HTa.
  • the first switching element RLa may be a relay element.
  • the continuous operation mode Pona in which the first defrost heater HTa is continuously turned on may be performed, and when the first switching element RLa performs On and off switching, the pulse operation mode Ponb in which the first defrost heater HTa is repeatedly turned on and off may be performed.
  • a second switching element RLb in the heater driver 332 may control the operation of the second defrost heater HTb.
  • the second switching element RLb may be a relay element.
  • the continuous operation mode Ponb in which the second defrost heater HTb is continuously turned on may be performed, and when the second switching element RLb performs On and off switching, the pulse operation mode Ponb in which the second defrost heater HTb is repeatedly turned on and off may be performed.
  • On and off timings of the first switching element RLa and the second switching element RLb may be different from each other. Accordingly, it is possible to perform the defrosting of the freezer compartment evaporator and the defrosting of the refrigerating compartment evaporator, separately.
  • FIG. 8A is a diagram illustrating an example of a pulse waveform indicating an operation of one defrost heater of FIG. 7A .
  • the horizontal axis of the pulse waveform Psh may represent time and the vertical axis may represent a level.
  • the controller 310 of the refrigerator 100 may end the normal cooling operation mode Pga and control to perform the defrost operation mode pdf.
  • the defrost operation mode pdf may include a pre-defrost cooling mode Pbd between Toa and Ta, a heater operation mode PddT between Ta and Td, and a post-defrost cooling mode pbf between Td and Te.
  • the defrost heater 330 is turned off in the normal cooling operation mode Pga and the normal cooling operation mode Pgb.
  • the defrost heater 330 may be turned off in the pre-defrost cooling mode Pbd and the post-defrost cooling mode pbf of the defrost operation mode PDF.
  • the defrost heater 330 may be continuously turned on in the continuous operation mode Pona of the heater operation mode PddT, and may be repeatedly turned on and off in the pulse operation mode Ponb of the heater operation mode PddT.
  • the continuous operation mode Pona may be performed between Ta and Tb, and the pulse operation mode Ponb may be performed between Tb and Tc.
  • the continuous operation mode Pona and the pulse operation mode Ponb are used in combination. Accordingly, defrosting efficiency and power consumption may be improved.
  • FIG. 8B is a diagram illustrating an example of a pulse waveform indicating an operation of two defrost heaters of FIG. 7B .
  • FIG. 8B shows a pulse waveform Psha indicating an operation of the freezer compartment defrost heater
  • Pshb indicating an operation of the refrigerating compartment defrost heater
  • the pulse waveform Psha of (a) of FIG. 8B may be the same as the pulse waveform Psh of FIG. 8A .
  • an operating section of the refrigerating compartment defrost heater may be less than an operating section of the freezer compartment defrost heater.
  • a period of continuously turning on in the continuous operation mode Pona in the heater operation mode PddT may be less than a period of the pulse waveform Psha of (a) of FIG. 8B .
  • an ON/OFF repetition period of the pulse operation mode Ponb in the heater operation mode PddT may be less than the pulse waveform Psha of (a) of FIG. 8B .
  • FIG. 9 is a diagram illustrating an example of cooling power supply and a defrost heater operation in the defrost operation mode pdf of FIG. 8A .
  • the defrost operation mode pdf may include a pre-defrost cooling mode Pbd between To and Ta, a heater operation mode PddT between Ta and Td, and a post-defrost cooling mode pbf between Td and Te.
  • a level of supplied cooling power may be an R level, and during a period T1 to T2, a level of cooling power may be an F level greater than the R level.
  • the cooling power supply may be stopped.
  • a level of supplied cooling power may be the R level.
  • cooling power supply for compensating for the stoppage of cooling power supply during the heater operation mode PddT is performed.
  • the cooling power supply may be performed by a compressor, a thermoelectric element, or the like, and in the drawings, it is illustrated that the cooling power supply is performed by an operation of the compressor.
  • the compressor operates, and during a period T2 to T3 in which cooling power is not supplied, the compressor is turned off.
  • the refrigerating compartment fan may operate and the freezer compartment fan may be turned off.
  • the refrigerating compartment fan may be turned off and the freezer compartment fan may be operated.
  • the defrost heater 330 should be maintained in an OFF state.
  • the defrost heater 330 may operate during the period of Ta to Tc in the period of Ta to Td of the heater operation mode PddT.
  • the continuous operation mode Pona may be performed during the period of Ta and Tb of the heater operation mode PddT period, and the heater operation mode PddT may be performed during the Tb and Tc periods.
  • the defrost heater 330 may be turned off from Tc, which is an end time point of the continuous operation mode Pona, to Td.
  • the compressor and the refrigerating compartment fan may be turned off.
  • the freezer compartment fan may be turned off.
  • the freezer compartment fan is turned off from Tc, which is the end time point of the continuous operation mode Pona, to Td.
  • the post-defrost cooling mode Pbf is performed.
  • a level of the supplied cooling power may be an R+F level, and the largest level of cooling power may be supplied.
  • a level of the supplied cooling power may be F level, and the cooling power supply may be stopped during the period T6 to Te.
  • the largest level of cooling power supply may be performed according to the stopping of the cooling power supply during the heater operation mode PddT.
  • the compressor operates, and the compressor is turned off during the period of T6 to Te in which cooling power is not supplied.
  • the refrigerating compartment fan and the freezer compartment fan may be turned off together.
  • the refrigerating compartment fan may be turned off and the freezer compartment fan may be operated.
  • the level of power consumption in the heater operation mode PddT in FIG. 9 may be greater than the level of power consumption of the R+F level cooling power.
  • FIG. 10 is a diagram illustrating temperature change waveforms of an evaporator in response to the defrost heater being operated only in the continuous operation mode and in response to the continuous operation mode and the pulse operation mode being mixed.
  • CVa represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 is continuously turned on, and may be turned off at a time point Tx, as shown in (b) of FIG. 10 .
  • the defrost heater 330 operates during the Pohm period, as shown in (c) of FIG. 10 .
  • the continuous operation mode is performed, and the pulse operation mode is performed during a Pofn period from Tpa to Tpb.
  • Trf1 represents a phase-change temperature, and may be, for example, 0°C.
  • Trf2 represents a defrost end temperature, for example, may be 5°C.
  • Trf1 and Trf2 may indicate a defrosting region in which defrosting is actually performed, and a region exceeding Trf2 may indicate an overheating region in which excessive defrosting is performed.
  • a size of the overheating region is reduced and a size of the defrosting region is increased.
  • the continuous operation mode and the pulse operation mode of the defrost heater 300 are mixed in order to reduce the size of the overheating region and increase the size of the defrosting region.
  • the controller 310 may be configured to control a peak temperature arrival point Qd of the evaporator 122 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a peak temperature arrival point Qc of the evaporator 122 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a size of a second section Arbb related to a temperature versus time between a phase-change temperature Trf1 and a defrost end temperature Trf2 in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode PDF to be greater than a size of a first section Arab related to a temperature versus time between the phase-change temperature Trf1 and the defrost end temperature Trf2 in response to the defrost heater being only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control an effective defrost when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than an effective defrost when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a heater OFF time point Tpb when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a heater OFF time point Tx when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a period Tpb-Qd between the heater OFF time point Tpb and a peak temperature arrival time Qd of the evaporator 122 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than a period Tx-Qc between the heater OFF time point and the peak temperature arrival time Qc of the evaporator 122 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a period Tpb-Qh during which a temperature maintains above the phase-change temperature Trf1 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than a period Tx-Qg during which a temperature maintains above the phase-change temperature Trf1 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed
  • the controller 310 may be configured to control a period Tpb-Qh between the heater OFF time point Tpb to a time point at which a temperature falls below a phase-change temperature Trf1 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be less than a period Tx-Qg between the heater OFF time point Tx to a time point Qg at which the temperature falls below the phase-change temperature Trf1 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a size of an overheat temperature region Arba equal to higher than the defrosting end temperature Trf2 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be less than an overheat temperature region Araa equal to higher than the defrosting end temperature Trf2 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • (d) shows a cooling power supply waveform COa in the case of only continuously turning on the defrost heater 330 and a cooling power supply waveform COb in the case of performing a continuous operation mode Pona and a pulse operation mode Ponb.
  • the controller 310 may be configured to control a cooling power supply time point Tcb according to a normal cooling operation mode Pga when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a cooling power supply time point Tca according to the normal cooling operation mode Pga when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF.
  • FIG. 11 is a diagram illustrating an operating method in a pulse operation mode according to an embodiment of the present disclosure.
  • the controller 310 controls the defrost heater 330 to be turned on based on the heater operation mode, in particular, based on the continuous operation mode (S1115).
  • the controller 310 calculates a change rate ⁇ T of a temperature detected by the temperature sensor 320 during the operation of the defrost heater 330, and determines whether the change rate ⁇ T of the temperature is equal to or greater than a first reference value ref1 (S1120).
  • the controller 310 may control the defrost heater 330 to continuously operate.
  • the controller 310 may temporarily turn off the defrost heater 330 (S1125).
  • the controller 310 calculates the change rate ⁇ T of the temperature detected by the temperature sensor 320 after the defrost heater 330 is temporarily turned off, and determine whether the change rate ⁇ T of the temperature is less than or equal to a second reference value ref2 (S1128).
  • the controller 310 is configured to turn on the defrost heater. That is, the controller 310 controls to perform step S1115.
  • step S1128 after the defrost heater 330 is temporarily turned off, when the change rate ⁇ T of the temperature exceeds the second reference value ref2, the controller 310 determines a pulse operation mode end condition is met.
  • the controller 310 ends the pulse operation mode and controls the heater to be turned off (S1140).
  • the pulse operation mode end condition may correspond to the pulse operation mode time point.
  • the pulse operation mode end time point may be a time at which the temperature detected by the temperature sensor 320 falls below the phase-change temperature Trf1.
  • the pulse operation mode end time point may be an end time point of the defrosting operation or an end time point of the heater operation mode.
  • the controller 310 controls to perform the defrost operation mode PDF and controls to perform the continuous operation mode Pona in which the defrost heater 330 is continuously turned on and the pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off based on the defrost operation mode PDF, and in response to performing the pulse operation mode Ponb, the controller controls the defrost heater 330 to be turned on and off based on the change rate ⁇ T of the temperature detected by the temperature sensor 320. Accordingly, since defrosting may be performed based on the change rate ⁇ T of the temperature, it is possible to improve defrost efficiency and power consumption.
  • the controller 310 may be configured to perform the continuous operation mode Pona or the pulse operation mode Ponb based on the change rate ⁇ T of the temperature detected by the temperature sensor 320. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to operate the heater with power inversely proportional to the change rate ⁇ T of the temperature detected by the sensor during the pulse operation mode Ponb. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to decrease a period of performing the defrost operation mode PDF as the number of opening times the cooling compartment door increases. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • FIG. 12A is a diagram showing a temperature waveform of the evaporator when there is a large amount of frost formation.
  • CVma represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVmb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 may be continuously turned on, and may be turned off at a time point Tmg, as shown in (b) of FIG. 12A .
  • the defrost heater 330 is continuously turned on during a Tma period and turned off during Tma and Tmb, during Tmc and Tmd, during Tme and Tmf, and during Tmg and Tmh, and the defrost heater 330 is turned on during Tmb and Tmc, during Tmd and Tme, during Tmf and Tmg, and during Tmh and Tmi.
  • the defrost heater 330 operates in the pulse operation mode.
  • the controller 310 controls the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and in the ON state of the defrost heater 330, when the change rate ⁇ T of the ambient temperature of the evaporator 122 detected by the temperature sensor 320 is equal to or greater than the first reference value ref1, the controller 310 may enter the pulse operation mode Ponb and control the defroster heater 330 to be turned off. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may control the defrost heater 330 to be turned on. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may control the defrost heater 330 may to be turned on. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and based on the pulse operation mode Ponb, the controller 310 may repeatedly turned on and off the defrost heater 320 so that the change rate ⁇ T of the temperature around the evaporator 122 may be between the first reference value ref1 and the second reference value ref2. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • FIG. 12B is a diagram showing a temperature waveform of the evaporator when the amount of frost formation is less than that of FIG. 12A .
  • CVna represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVnb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 may be continuously turned on and may be turned off at a time point Tng, as shown in (b) of FIG. 12B .
  • the defrost heater 330 is continuously turned on during a period of Tna, and the defrost heater 330 is turned off during Tna and Tnb, during Tnc and Tnd, during Tne and Tnf, and during Tng and Tnh, and turned on during Tnb and Tnc, during Tnd and Tne, during Tnf and Tng, and during Tnh and Tni.
  • the defrost heater 330 operates in the pulse operation mode.
  • FIG. 13 is a view showing a region requiring cooling power supply and a region requiring defrosting according to temperatures of the refrigerating compartment and the freezer compartment.
  • the horizontal axis may indicate a temperature of the refrigerating compartment
  • the vertical axis may indicate a temperature of the freezer compartment.
  • a temperature is equal to or lower than a reference temperature of the freezer compartment refma, it may indicate that a freezing capacity is sufficient, and when the temperature is equal to or lower than a reference temperature of the refrigerating compartment refmb, it may indicate that cooling capacity of the refrigerating compartment is sufficient.
  • An Arma region in the drawing is a region in which freezing capacity of the freezer compartment and cooling capacity of the refrigerating compartment are sufficient, and may be a region requiring defrosting.
  • the controller 310 may be configured to perform the continuous operation mode and the pulse operation mode described above.
  • ON/OFF of the defrost heater 330 in the pulse operation mode may be controlled based on a temperature change rate around the evaporator 122.
  • the Armb region in the drawing may be a region in which both cooling power of the freezer compartment and cooling power of the refrigerating compartment are insufficient, and may be a cooling power supply requiring region requiring cooling power supply.
  • the controller 310 may control supply of cooling power.
  • a compressor may be operated or a thermoelectric element may be operated to control supply of cooling power.
  • FIG. 14 is a flowchart illustrating a method of operating a defrost heater according to another embodiment of the present disclosure
  • FIGS. 15A to 15D are diagrams referenced in the description of FIG. 14 .
  • the controller 310 of the refrigerator 100 determines whether a defrosting operation start time point arrives for defrosting (S610).
  • the controller 310 of the refrigerator 100 may determine whether a defrosting operation start time point arrives, while performing the normal cooling operation mode Pga.
  • the defrosting operation start time point may vary according to a defrost cycle.
  • the controller 310 of the refrigerator 100 may end the normal cooling operation mode and control to perform the defrost operation mode pdf.
  • the defrost operation mode PDF may include a pre-defrost cooling mode Pbd, a heater operation mode PddT, and a post-defrost cooling mode pbf.
  • the heater operation mode PddT may include a continuous operation mode Pona in which the defrost heater 330 is continuously turned on, and a pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 of the refrigerator 100 may control the defrost heater 330 to be continuously turned on based on the heater operation mode PddT in the defrost operation mode PDF (S615).
  • the controller 310 may control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona in the heater operation mode PddT.
  • the controller 310 of the refrigerator 100 may control the pulse operation mode Ponb, in which the defrost heater 330 is repeatedly turned on and off, to be performed by a heater pulse after the defrost heater 330 is continuously turned on (S620).
  • the controller 310 may determine whether the return condition to the continuous operation mode is satisfied (S623), and if so, control the continuous operation mode to be performed again.
  • the controller 310 may control the pulse operation mode to end, and the continuous operation mode to be performed again.
  • the defrosting may be stably performed.
  • the controller 310 of the refrigerator 100 determines whether it is the pulse operation mode end time point (S630), and if so, turns off the defrost heater 330 (S640).
  • the pulse operation mode end point time may be a time point at which the temperature detected by the temperature sensor 320 falls below the phase change temperature Trf1.
  • the pulse operation mode end time point may be a defrost operation end time point or a heater operation mode end time point.
  • the controller 310 may control the continuous operation mode Pone to be performed again after performing the pulse operation mode Ponb for stable defrosting. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may determine that the defrosting is not smooth, and control the continuous operation mode Pone to be performed for quick defrosting. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • FIG. 15A is a diagram illustrating an example of a pulse waveform indicating an operation of a defrost heater according to an embodiment of the present disclosure.
  • a horizontal axis of a pulse waveform Pshm may indicate time, and a vertical axis may indicate a level.
  • the controller 310 of the refrigerator 100 may control the normal cooling operation mode Pga to end and the defrost operation mode PDF to be performed.
  • the defrost operation mode PDF may include the pre-defrost cooling mode Pbd between Toa and Ta, the heater operation mode PddT between Ta and Td, and the post-defrost cooling mode pbf between Td and Te.
  • the defrost heater 330 is turned off in the normal cooling operation mode Pga and the normal cooling operation mode Pgb.
  • the defrost heater 330 may be turned off in the pre-defrost cooling mode Pbd and the post-defrost cooling mode pbf of the defrost operation mode PDF.
  • the defrost heater 330 may be continuously turned on in the continuous operation mode Pona in the heater operation mode PddT, may repeat the turn on and off in the pulse operation mode Ponb in the heater operation mode PddT, and may be continuously turned on in the continuous operation mode Pone in the heater operation mode PddT.
  • the controller 310 may control the continuous operation mode Pone to be further performed.
  • the continuous operation mode Pona may be performed between Ta and Tb, and the pulse operation mode Ponb may be performed between Tb and Tc.
  • An additional continuous operation mode Pone may be performed between Tcm and Td.
  • the period during which the additional continuous operation mode Pone is performed is Mz.
  • FIG. 15B is a diagram illustrating another example of a pulse waveform indicating an operation of a defrost heater according to an embodiment of the present disclosure.
  • a pulse waveform Pshn of FIG. 15B is similar to the pulse waveform Pshm of FIG. 15A , but the additional continuous operation mode Pone is different in that it is performed between Tcm and Tcn.
  • My which is the duration of the additional continuous operation mode Pone, is less than Mz of FIG. 15A .
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the value related to the temperature detected by the temperature sensor 320 and the reference value. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease. By this additional continuous operation mode Pone, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the temperature detected by the temperature sensor 320 and the reference temperature while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the change rate DT of the temperature detected by the temperature sensor 320 and the change rate ⁇ T of the reference temperature while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the temperature detected by the temperature sensor 320 and the target temperature while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the reference level and the sum Ma+Mb+,,,Mn of the on time of the defrost heater 330 while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the reference number of opening times and the sum of the number of opening times of turn on of the defrost heater 330 while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the sum Mo of the continuous ON time and the sum Ma+Mb+,,,Mn of the ON time of the defrost heater 330 while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • the controller 310 may vary the period during which the continuous operation mode Pone is performed based on the difference between the humidity in the refrigerator and the reference humidity while performing the pulse operation mode Ponb. For example, as the difference decreases, it is possible to control the period during which the continuous operation mode Pone is performed to decrease.
  • FIG. 15C is a diagram illustrating another example of a pulse waveform indicating an operation of a defrost heater according to an embodiment of the present disclosure.
  • a pulse waveform Psho of FIG. 15c is similar to the pulse waveform (Pshm) of FIG. 15A , but there is a difference in that after the pulse operation mode Ponb, an additional continuous operation mode Ponab and an additional pulse operation mode ponbb are further performed.
  • the duration of the additional continuous operation mode Ponab is preferably less than the duration of the continuous operation mode Pona.
  • the duration of the additional pulse operation mode ponbb is preferably less than the duration of the continuous operation mode Ponb. Accordingly, it is possible to improve the defrosting efficiency while stably performing the defrosting.
  • FIG. 16 is a flowchart illustrating a defrosting method according to another embodiment of the present disclosure
  • FIGS. 17A to 17D are diagrams referenced in the description of FIG. 16 .
  • the controller 310 of the refrigerator 100 determines whether a defrosting operation start time point arrives for defrosting (S610).
  • the controller 310 of the refrigerator 100 may determine whether it is the defrosting operation start time point, while performing the normal cooling operation mode Pga.
  • the defrosting operation start time point may vary according to a defrost cycle.
  • the controller 310 of the refrigerator 100 may end the normal cooling operation mode and control the defrost operation mode PDF to be performed.
  • the defrost operation mode PDF may include a pre-defrost cooling mode Pbd, a heater operation mode PddT, and a post-defrost cooling mode pbf.
  • the heater operation mode (PddT) may include a continuous operation mode Pona in which the defrost heater 330 is continuously turned on, and a pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 of the refrigerator 100 may control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona in the heater operation mode PddT of the defrost operation mode PDF (S615).
  • the controller 310 of the refrigerator 100 determines whether the temperature detected by the temperature sensor 320 reaches a first temperature Tm1 within a first period Pm1 while performing the continuous operation mode Pona (S1616).
  • the controller 310 of the refrigerator 100 may control the pulse operation mode, in which the defrost heater 330 is repeatedly turned on and off, to be performed by the heater pulse after the defrost heater 330 is continuously turned on (S1620).
  • the continuous operation mode (Pona) is performed during the Pm1 period between Ta and Tb.
  • the controller 310 of the refrigerator 100 may control the pulse operation mode Ponb to be performed after Tb.
  • the controller 310 of the refrigerator 100 may control the defrost heater 330 to be turned off during the period pf1 and then the defrost heater 330 to be repeatedly turned on and off.
  • the controller 310 of the refrigerator 100 determines whether it is the pulse operation mode end time point (S1630), and if so, turns off the defrost heater 330 (S1640).
  • the pulse operation mode end point time may be a time point at which the temperature detected by the temperature sensor 320 falls below the phase change temperature Trf1.
  • the pulse operation mode end time point may be a defrost operation end time point or a heater operation mode end time point.
  • step S1616 when the temperature detected by the temperature sensor 320 does not reach the first temperature Tm1 within the first period Pm1 while performing the continuous operation mode Pona, step S1617 may be performed.
  • the controller 310 of the refrigerator 100 determines whether the first temperature Tm1 arrival period is greater than or equal to the second period (S1617).
  • FIG. 17A illustrates another example of a temperature waveform Tcvb around the evaporator 122
  • FIG. 17B illustrates another example of an operating waveform Pshb1 of the defrost heater 330.
  • the continuous operation mode Pona is performed during the period Pm1 between Ta and Tb.
  • the controller 310 of the refrigerator 100 determines whether the first temperature Tm1 arrival period is greater than or equal to the second period pm2.
  • the controller 310 of the refrigerator 100 may control the continuous operation mode Pona1 to be performed during the periods Ta and Tc.
  • the controller 310 of the refrigerator 100 may control that, during the heater operation mode Pon, only the continuous operation mode Pona1 is performed and the pulse operation mode (Ponb) is not performed. Accordingly, when the amount of frost formed on the evaporator 122 is large, it is possible to control to efficiently perform defrosting.
  • the controller 310 of the refrigerator 100 may control the continuous operation mode Pona1 to be performed during a predetermined period after the period Tc.
  • step S1622 may be performed again.
  • step S1618 when the first temperature Tm1 arrival period of the temperature detected by the temperature sensor 320 is not greater than or equal to the second period but is between the first period and the second period while performing the continuous operation mode Pona, step S1618 may be performed
  • the controller 310 of the refrigerator 100 determines whether the temperature detected by the temperature sensor 320 reaches the second temperature Tm2 between the first period and the second period while performing the continuous operation mode Pona (S1618). If so, the defrost heater is turned off (S1619), and the defrost heater may be controlled to be turned on and off based on the pulse operation mode (S1621).
  • the continuous operation mode is performed during the period Pm1 between Ta and Tb.
  • the controller 310 of the refrigerator 100 determines whether the first temperature Tm1 arrival period is greater than or equal to the second period pm2 or between the first period pm1 and the second period pm2.
  • the temperature detected by the temperature sensor 320 reaches the first temperature Tm1 in Tk between the first period pm1 and the second period pm2, and the temperature detected by the temperature sensor 320 reaches the second temperature Tm2 in Tm between the first period pm1 and the second period pm2.
  • the controller 310 of the refrigerator 100 may be configured to perform the continuous operation mode until the time point Tm at which a temperature reaches the second temperature Tm2
  • the pulse operation mode Ponb2 may be controlled to be performed.
  • tit is preferable that the first OFF period psf2 of the defrost heater 330 after the time point Tm is greater than the OFF period during the On and off of the pulse operation mode Ponb2.
  • the first OFF period psf2 of the defrost heater 330 after the time point Tm when the pulse operation mode Ponb2 is performed is greater than the first OFF period pof1 of the defrost heater 330 after the time point Tb when the pulse operation mode Ponb of FIG. 17A is performed. Accordingly, it is possible to protect the switching element RL of FIG. 7A and the like.
  • the controller 310 may be configured to, as the change rate of the temperature detected by the temperature sensor 320 decreases while performing the continuous operation mode Pon, increase a delay of the start time point of the pulse operation mode Ponb.
  • the change rate of the temperature detected by the temperature sensor 320 is smaller, and accordingly, the start time point of the pulse operation mode is further delayed.
  • the change rate of the temperature detected by the temperature sensor 320 is smaller, and accordingly, the pulse operation mode may not start at all.
  • controller 310 may be configured to, as the change rate of the temperature detected by the temperature sensor decreases while performing the continuous operation mode Pona, increase the duration of the pulse operation mode Pona.
  • the change rate of the temperature detected by the temperature sensor 320 is smaller, and accordingly, the duration of the continuous operation mode is a period between Ta and Tm, and is greater than the period between Ta and Tb of FIG. 17A .
  • the change rate of the temperature detected by the temperature sensor 320 is smaller, and accordingly, the duration of the continuous operation mode is a period between Ta and Tc, and is greater than the period between Ta and Tm of FIG. 17B . Accordingly, it is possible to efficiently perform the defrosting.
  • the controller 310 may control the pulse operation mode Ponb to be performed after the defrost heater 310 is turned off without determining whether the second period Pm2 arrives.
  • the controller 310 may be configured to control the OFF period of the defrost heater 310 before the pulse operation mode Ponb is performed when the temperature detected by the temperature sensor 320 reaches the first temperature Tm1 between the first period Pm1 and the second period Pm2 to be greater than the OFF period of the defrost heater 310 before the pulse operation mode Ponb is performed when the temperature detected by the temperature sensor 320 reaches the first temperature Tm1 within the first period Pm1. Accordingly, it is possible to efficiently perform the defrosting.
  • the configuration and the method of the embodiments as described above are not restrictively applied. Rather, all or some of the embodiments may be selectively combined with each other so that the embodiments may be variously modified.
  • the present disclosure can be applied to a refrigerator, and more particularly, can be applied to a refrigerator capable of improving defrosting efficiency and power consumption.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
EP21799931.7A 2020-05-07 2021-04-21 Réfrigérateur Pending EP4148355A4 (fr)

Applications Claiming Priority (3)

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KR1020200054354A KR20210136306A (ko) 2020-05-07 2020-05-07 냉장고
KR1020200054351A KR20210136303A (ko) 2020-05-07 2020-05-07 냉장고
PCT/KR2021/005055 WO2021225308A1 (fr) 2020-05-07 2021-04-21 Réfrigérateur

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KR20010026176A (ko) 1999-09-03 2001-04-06 구자홍 냉장고의 제상히터 제어 방법
US6694754B1 (en) 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
KR20040057156A (ko) * 2002-12-24 2004-07-02 엘지전자 주식회사 냉장고의 제상제어방법
CN101571339B (zh) * 2008-04-29 2012-08-29 博西华家用电器有限公司 冰箱除霜控制方法及应用该方法的冰箱
KR20100032532A (ko) * 2008-09-18 2010-03-26 엘지전자 주식회사 냉장고의 제어 방법
DE102009028778A1 (de) * 2009-08-21 2011-02-24 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, insbesondere Haushaltskältegerät, sowie Verfahren zum Betrieb eines solchen Kältegerätes
JP5756898B2 (ja) * 2009-12-28 2015-07-29 パナソニックヘルスケアホールディングス株式会社 保冷庫
JP2012167896A (ja) * 2011-02-16 2012-09-06 Toshiba Corp 冷蔵庫
JP2014052155A (ja) * 2012-09-10 2014-03-20 Panasonic Corp 冷蔵庫
KR102241307B1 (ko) 2014-11-05 2021-04-16 삼성전자주식회사 제상 장치, 이를 구비한 냉장고 및 제상 장치의 제어 방법
US10323875B2 (en) * 2015-07-27 2019-06-18 Illinois Tool Works Inc. System and method of controlling refrigerator and freezer units to reduce consumed energy

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EP4148355A4 (fr) 2024-05-01
US20230160625A1 (en) 2023-05-25

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