EP4579091A1 - An electrical device comprising a compressor with improved energy efficiency - Google Patents

An electrical device comprising a compressor with improved energy efficiency Download PDF

Info

Publication number
EP4579091A1
EP4579091A1 EP24215090.2A EP24215090A EP4579091A1 EP 4579091 A1 EP4579091 A1 EP 4579091A1 EP 24215090 A EP24215090 A EP 24215090A EP 4579091 A1 EP4579091 A1 EP 4579091A1
Authority
EP
European Patent Office
Prior art keywords
cut
temperature
fan
compressor
value
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
EP24215090.2A
Other languages
German (de)
French (fr)
Inventor
Bora Abdik
Veysel Ahmet Ozdemir
Fatih OZDEMIR
Tugay Bozik
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.)
Arcelik AS
Original Assignee
Arcelik AS
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
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP4579091A1 publication Critical patent/EP4579091A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/54—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to blowers or fans
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/26—Heat pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/303—Temperature

Definitions

  • the manufacturer determines a fan cut-in temperature for the compressor lower than the cut-off temperature, and when the said temperature value is reached, the compressor fan is automatically turned on and the compressor is cooled.
  • this forced cooling process causes heat to be released, system efficiency is reduced.
  • the cut-off temperature and the fan cut-in temperature are defined by the manufacturer according to the current value at the lowest voltage level at which the compressor is required to operate, and this is a relatively high current value compared to normal operating conditions, in other words, conditions under which electrical energy with an acceptable voltage is provided by the mains.
  • the cut-off temperature and the fan cut-in temperature determined as fixed by the manufacturer provide protection under abnormal operating conditions, they cause the energy efficiency of the compressor and thus of the electrical device in which the compressor is used to decrease under normal conditions.
  • the aim of the present invention is the realization of an electrical device comprising a compressor with improved energy efficiency by adaptively changing the cut-off temperature and the fan cut-in temperature depending on the instantaneous voltage supplied by the mains.
  • the electrical device realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit which stores a cut-off temperature value at which the operation of an electric motor disposed in a compressor positioned in a body is terminated and a fan cut-in temperature value at which a fan positioned in the body is started to operate, which is configured to control the operation of the electric motor and the fan depending on the temperature information provided by a temperature sensor adapted to detect the temperature around the electric motor and the stored cut-off temperature value and fan cut-in temperature value and which is further configured to monitor the voltage of the electricity supplied to the electric motor from the electrical mains in real time and to control and change the cut-off temperature value and/or the fan cut-in temperature value to predetermined values depending on the monitored voltage value.
  • control unit updating the cut-off temperature value and/or the fan cut-in temperature value depending on the voltage value, safety is provided under abnormal conditions, in other words, when the electrical voltage supplied from the mains is lower than a certain threshold value and thus the current drawn is relatively high, and in other conditions, the compressor is prevented from operating inefficiently by using the appropriate cut-off temperature value and/or the fan cut-in temperature value.
  • the present invention also relates to an electrical appliance which is a laundry dryer.
  • an electrical appliance which is a laundry dryer.
  • the electrical device (1) comprises a body (2); a compressor (4) which is disposed in the body (2) and which has at least one electric motor (3); at least one fan (5) which is configured to blow air onto the compressor (4); at least one temperature sensor (6) which is configured to detect the temperature of the electric motor (3) and/or the compressor (4); and at least one control unit (7) which stores a cut-off temperature value at which the operation of the electric motor (3) is stopped and a fan cut-in temperature value at which the operation of the fan (5) is started, and which is configured to control the operation of the electric motor (3) and the fan (5) depending on the temperature information received from the temperature sensor (6), the stored cut-off temperature value and fan cut-in temperature value.
  • the temperature of the electric motor (3) may continue to increase despite the operation of the fan (5).
  • the control unit (7) controls the electric motor (3) to stop the operation.
  • the electric motor (3) is prevented from being damaged due to high temperature.
  • the present invention relates to an electrical device (1) which is a laundry dryer.
  • the compressor (4) is operated without the need for being stopped for too long for safety purposes, and almost all of the operations to be performed by the laundry dryer are performed within the specified time for the said operations, and customer satisfaction is not compromised.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The present invention relates to an electrical device (1) comprising a compressor (4) with improved energy efficiency. The electrical device (1) comprises a body (2); a compressor (4) which is disposed in the body (2) and which has at least one electric motor (3); at least one fan (5) which is configured to blow air onto the compressor (4); at least one temperature sensor (6) which is configured to detect the temperature of the electric motor (3) and/or the compressor (4); and at least one control unit (7) which stores a cut-off temperature value at which the operation of the electric motor (3) is stopped and a fan cut-in temperature value at which the operation of the fan (5) is started, and which is configured to control the operation of the electric motor (3) and the fan (5) depending on the temperature information received from the temperature sensor (6), the recorded cut-off temperature value and fan cut-in temperature value.

Description

  • The present invention relates to an electrical device comprising a compressor with improved energy efficiency.
  • Compressors are particularly used in cooling cycles performed by means of a refrigerant fluid in devices such as laundry dryer, etc., and compress the refrigerant fluid used in the cooling cycle with the electrical energy supplied from the electricity grid so as to increase the pressure thereof. Therefore, the work done by the compressor depends on the speed of the compressor and the conditions of the evaporator and the condenser used in the cooling cycle of the refrigerant fluid. The decrease in the mains voltage due to various reasons, in other words, the relatively low voltage electricity supplied to the compressor by the mains, does not affect the conditions of the refrigerant fluid used in the cooling cycle, but causes the compressor speed to decrease to a certain level. Taking these two facts into account, in order for the compressor to be properly operated, the electrical power required by the compressor must remain constant at an acceptable level as the voltage decreases. The constant electrical power and the voltage decreases cause the current drawn by the compressor to increase, which in turn increases the temperatures of the windings in the compressor motor. In order to prevent the said increased temperature from damaging the windings, overload protectors are used in the state of the art. Said overload protector is configured to become open circuit and terminate the operation of the compressor such that the windings are not damaged depending on the temperature and current. Depending on the temperature and current drawn, it requires a period of 20-25 minutes for the overload protector, which becomes open circuit, to become closed circuit again, depending on the ambient temperature, and such a period causes the duration of operations performed by electrical devices such as laundry dryers, etc. using said compressor to increase and thus the user satisfaction to decrease.
  • Moreover, in order to keep the operation times of such electrical devices wherein compressors are used under control even under abnormal conditions such as the occurrence of a high-temperature environment due to very low voltage electricity supply, the temperature on the negative temperature coefficient thermistor is detected and the compressor is turned off and on depending on this detected temperature; in other words, the operation thereof is terminated and then restarted. In the state of the art, the temperature of the negative temperature coefficient thermistor at which the compressor must be turned off and on, that is, the cut-off temperature, is determined by taking into account the current value formed at the lowest allowed value of the supply voltage. Furthermore, the manufacturer determines a fan cut-in temperature for the compressor lower than the cut-off temperature, and when the said temperature value is reached, the compressor fan is automatically turned on and the compressor is cooled. However, since this forced cooling process causes heat to be released, system efficiency is reduced. In the state of the art, the cut-off temperature and the fan cut-in temperature are defined by the manufacturer according to the current value at the lowest voltage level at which the compressor is required to operate, and this is a relatively high current value compared to normal operating conditions, in other words, conditions under which electrical energy with an acceptable voltage is provided by the mains. Although the cut-off temperature and the fan cut-in temperature determined as fixed by the manufacturer provide protection under abnormal operating conditions, they cause the energy efficiency of the compressor and thus of the electrical device in which the compressor is used to decrease under normal conditions.
  • In the state of the art Chinese patent document no. CN101776318 , a method is disclosed, which ensures that the compressor is operated between 160V and 260V and which automatically terminates the operation of the compressor when electricity is supplied at a voltage outside these values.
  • In the state of the art Chinese utility model document no. CN2511029 , a protection circuit is disclosed, which is activated at predetermined low and high voltages to protect compressors having asynchronous motors and which is deactivated when the supplied voltage reaches normal levels.
  • Therefore, in the state of the art, there is a need for an electrical device comprising a compressor with improved energy efficiency by adaptively changing the cut-off temperature and the fan cut-in temperature depending on the instantaneous voltage supplied by the mains.
  • The aim of the present invention is the realization of an electrical device comprising a compressor with improved energy efficiency by adaptively changing the cut-off temperature and the fan cut-in temperature depending on the instantaneous voltage supplied by the mains.
  • The electrical device realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit which stores a cut-off temperature value at which the operation of an electric motor disposed in a compressor positioned in a body is terminated and a fan cut-in temperature value at which a fan positioned in the body is started to operate, which is configured to control the operation of the electric motor and the fan depending on the temperature information provided by a temperature sensor adapted to detect the temperature around the electric motor and the stored cut-off temperature value and fan cut-in temperature value and which is further configured to monitor the voltage of the electricity supplied to the electric motor from the electrical mains in real time and to control and change the cut-off temperature value and/or the fan cut-in temperature value to predetermined values depending on the monitored voltage value. By means of the control unit updating the cut-off temperature value and/or the fan cut-in temperature value depending on the voltage value, safety is provided under abnormal conditions, in other words, when the electrical voltage supplied from the mains is lower than a certain threshold value and thus the current drawn is relatively high, and in other conditions, the compressor is prevented from operating inefficiently by using the appropriate cut-off temperature value and/or the fan cut-in temperature value.
  • In an embodiment of the present invention, the electrical device further comprises the control unit which is configured to store at least one predetermined voltage threshold value, to compare the determined real-time voltage with the said threshold voltage value, and, as a result of the comparison process if it is determined that the real-time voltage value supplied from the mains falls below the said threshold value, to bring the cut-off temperature value and/or the fan cut-in temperature value to a value lower than the current value.
  • The present invention also relates to an electrical appliance which is a laundry dryer. By increasing the energy efficiency without too much stopping the operation of the compressor in the laundry dryer for safety purposes, almost all of the operations to be performed by the laundry dryer are performed within the time specified for the said operations, and customer satisfaction is not compromised.
  • By means of the present invention, especially in case of high temperatures due to the electric motor drawing excessive current when the electrical energy supplied from the mains is at a low voltage, the cut-off temperature value at which the operation of the electric motor is automatically stopped as a safety precaution and/or the fan cut-in temperature value at which the fan starts operating for more effective cooling of the electric motor is adaptively updated depending on the electrical voltage supplied from the mains such that the electric motor is operated without causing any inefficiency under normal, in other words, acceptable voltage conditions.
  • The electrical device comprising a compressor with increased energy efficiency realized in order to attain the aim of the present invention is illustrated in the attached figure, where:
    Figure 1 - is the schematic view of the electrical device of the present invention.
  • The elements illustrated in the figure are numbered as follows:
    1. 1- Electrical device
    2. 2- Body
    3. 3- Electric motor
    4. 4- Compressor
    5. 5- Fan
    6. 6- Temperature sensor
    7. 7- Control unit
  • The electrical device (1) comprises a body (2); a compressor (4) which is disposed in the body (2) and which has at least one electric motor (3); at least one fan (5) which is configured to blow air onto the compressor (4); at least one temperature sensor (6) which is configured to detect the temperature of the electric motor (3) and/or the compressor (4); and at least one control unit (7) which stores a cut-off temperature value at which the operation of the electric motor (3) is stopped and a fan cut-in temperature value at which the operation of the fan (5) is started, and which is configured to control the operation of the electric motor (3) and the fan (5) depending on the temperature information received from the temperature sensor (6), the stored cut-off temperature value and fan cut-in temperature value. In the compressor (4), for example, in case of a decrease in the electrical voltage supplied from the mains, the current drawn by the electric motor (3), which is preferably of asynchronous type, increases in order to prevent any decrease in the operating power, which in turn causes the temperature of the electric motor (3) to increase over time. Therefore, the control unit (7) periodically reads the temperature value sensed by the temperature sensor (6) and compares the said temperature value with the cut-off temperature value and the fan cut-in temperature value stored therein. The fan cut-in temperature value is a value lower than the cut-off temperature value, and when the temperature read by the control unit (7) on the temperature sensor (6) is equal to the fan cut-in temperature value, the control unit (7) controls the fan (5) to start the operation. While the aim is to directly or indirectly reduce the temperature of the electric motor (3) with the air blown by the fan (5) towards the compressor (4), depending on the amount of current drawn, the temperature of the electric motor (3) may continue to increase despite the operation of the fan (5). In such a case, when the temperature read by the control unit (7) on the temperature sensor (6) is equal to the cut-off temperature value, the control unit (7) controls the electric motor (3) to stop the operation. Thus, the electric motor (3) is prevented from being damaged due to high temperature.
  • The electrical device (1) of the present invention comprises the control unit (7) which is configured to instantly monitor the voltage supplied from the mains and to update the cut-off temperature value and/or the fan cut-in temperature value to a predetermined appropriate value depending on the said voltage value. By means of the control unit (7) updating the cut-off temperature value and/or the fan cut-in temperature value depending on the voltage value, the safety of the electric motor (3) is provided under abnormal conditions, in other words, when the electrical voltage supplied from the mains is lower than a certain threshold value and thus the current drawn by the electric motor (3) is relatively high, and in other conditions, the compressor (4), and hence, the electrical device (1), are prevented from operating inefficiently by using the appropriate cut-off temperature value and/or the fan cut-in temperature value.
  • In an embodiment of the present invention, the electrical device (1) comprises the control unit (7) which is configured to store at least one predefined voltage threshold value and to update the cut-off temperature value and/or the fan cut-in temperature value to a value which is lower than the current value when the instantaneous voltage falls below the threshold value. Thus, the cut-off temperature value and/or the fan cut-in temperature value defined for safety purposes is brought to a lower value in abnormal conditions, and protective actions such as starting the fan (5) or terminating the operation of the electric motor (3) without being damaged by high temperatures are taken.
  • The present invention relates to an electrical device (1) which is a laundry dryer. By means of the dynamic updating of the cut-off temperature value and/or the fan cut-in temperature value in the laundry dryer, the compressor (4) is operated without the need for being stopped for too long for safety purposes, and almost all of the operations to be performed by the laundry dryer are performed within the specified time for the said operations, and customer satisfaction is not compromised.
  • By means of the present invention, an electrical device (1) is realized, comprising a compressor (4) which operates safely in the abnormal operating conditions where high current is drawn due to the decreasing mains voltage and in the normal conditions where the voltage level is safe, without causing any inefficiency by adaptively updating the cut-off temperature value and/or the fan cut-in temperature value depending on the electrical voltage supplied from the mains by the control unit (7).

Claims (3)

  1. An electrical device (1) comprising a body (2); a compressor (4) which is disposed in the body (2) and which has at least one electric motor (3); at least one fan (5) which is configured to blow air onto the compressor (4); at least one temperature sensor (6) which is configured to sense the temperature of the electric motor (3) and/or the compressor (4); and at least one control unit (7) which stores a cut-off temperature value at which the operation of the electric motor (3) is stopped and a fan cut-in temperature value at which the operation of the fan (5) is started, and which is configured to control the operation of the electric motor (3) and the fan (5) depending on the temperature information received from the temperature sensor (6), the stored cut-off temperature value and fan cut-in temperature value, characterized by the control unit (7) which is configured to instantly monitor the voltage supplied from the mains and to update the cut-off temperature value and/or the fan cut-in temperature value to a predetermined appropriate value depending on the said voltage value.
  2. An electrical device (1) as in Claim 1, characterized by the control unit (7) which is configured to store at least one predefined voltage threshold value and to update the cut-off temperature value and/or the fan cut-in temperature value to be lower than the current value when the instantaneous voltage falls below the threshold value.
  3. An electrical device (1) as in any one of the above claims, which is a laundry dryer.
EP24215090.2A 2023-12-28 2024-11-25 An electrical device comprising a compressor with improved energy efficiency Pending EP4579091A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR202319150 2023-12-28

Publications (1)

Publication Number Publication Date
EP4579091A1 true EP4579091A1 (en) 2025-07-02

Family

ID=93651320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24215090.2A Pending EP4579091A1 (en) 2023-12-28 2024-11-25 An electrical device comprising a compressor with improved energy efficiency

Country Status (1)

Country Link
EP (1) EP4579091A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2511029Y (en) 2001-09-05 2002-09-11 吴邦德 Electric motor and compressor protector
US20050240312A1 (en) * 2003-01-24 2005-10-27 Terry Robert L Integrated HVACR control and protection system
CN101776318A (en) 2009-12-21 2010-07-14 宁波奥克斯空调有限公司 Method for protecting compressor under high voltage and low voltage conditions
US11009250B2 (en) * 2015-06-30 2021-05-18 Emerson Climate Technologies Retail Solutions, Inc. Maintenance and diagnostics for refrigeration systems
EP3919671A1 (en) * 2020-06-05 2021-12-08 Electrolux Appliances Aktiebolag A method for operating a laundry drying machine equipped with a heat pump system and a laundry drying machine implementing said method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2511029Y (en) 2001-09-05 2002-09-11 吴邦德 Electric motor and compressor protector
US20050240312A1 (en) * 2003-01-24 2005-10-27 Terry Robert L Integrated HVACR control and protection system
CN101776318A (en) 2009-12-21 2010-07-14 宁波奥克斯空调有限公司 Method for protecting compressor under high voltage and low voltage conditions
US11009250B2 (en) * 2015-06-30 2021-05-18 Emerson Climate Technologies Retail Solutions, Inc. Maintenance and diagnostics for refrigeration systems
EP3919671A1 (en) * 2020-06-05 2021-12-08 Electrolux Appliances Aktiebolag A method for operating a laundry drying machine equipped with a heat pump system and a laundry drying machine implementing said method

Similar Documents

Publication Publication Date Title
US10418800B2 (en) Compressor protection and grid fault detection device
US4653285A (en) Self-calibrating control methods and systems for refrigeration systems
CN106524400A (en) Control method and device for air-conditioner and air-conditioner
CN109864681B (en) Drying control method and system of dish washing machine
US7276870B2 (en) Arrangement for overload protection and method for reducing the current consumption in the event of mains voltage fluctuations
CN107202403B (en) Transducer air conditioning and its control method
CN106288569A (en) Air conditioner and electric heating belt control method and device thereof
CN115342562A (en) Compressor control method for refrigerator and refrigerator
AU2016204990B2 (en) Method of operation of a heat pump drying and/or washing appliance and heat pump drying and/or washing appliance
WO2015078523A1 (en) Heat pump type laundry dryer with improved operational safety and energy efficiency and method for operating the same
EP4579091A1 (en) An electrical device comprising a compressor with improved energy efficiency
US3142013A (en) Motor protective system for air conditioning unit
CN108286868B (en) Refrigerator and control method thereof
TR2023019150A2 (en) AN ELECTRICAL DEVICE INCLUDING A COMPRESSOR WITH INCREASED ENERGY EFFICIENCY
KR100946799B1 (en) A cooling device and the control method
KR0177691B1 (en) Control method of compressor operation of inverter air conditioner
CN204063669U (en) The cascade refrigeration system that automatic time delay controls
KR100192896B1 (en) Total current control method of airconditioner
JPS6179943A (en) Air conditioner
WO2024129012A1 (en) A cooling device not affected by power outages
CN205300037U (en) Air cooled heat pump screw rod unit
CN120444231A (en) A method for protecting a compressor unit
JPH07103578A (en) Refrigerator compressor protector
KR20080050163A (en) Refrigerator with defrost inrush time control

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20241125

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN