US20070113569A1 - Refrigerator and control method of the same - Google Patents
Refrigerator and control method of the same Download PDFInfo
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- US20070113569A1 US20070113569A1 US11/591,536 US59153606A US2007113569A1 US 20070113569 A1 US20070113569 A1 US 20070113569A1 US 59153606 A US59153606 A US 59153606A US 2007113569 A1 US2007113569 A1 US 2007113569A1
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- Prior art keywords
- motor
- speed
- command speed
- driving
- ratio
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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Classifications
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- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
-
- 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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
-
- 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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
-
- 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
- F25D23/00—General constructional features
-
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a refrigerator and a method for controlling the same, and more particularly, to a refrigerator in which an operation state of a compressor is changed in accordance with external conditions.
- a refrigerator includes a compressor which compresses or expands a refrigerant by using a piston connected to a motor.
- the speed of the motor driving the compressor is controlled depending on an ambient environment.
- the motor speed it is difficult for the motor speed to reach a given command speed mostly due to the load torque.
- the motor is driven at a command speed lower than the initially given command speed in order to reduce generation of noise and vibration.
- the motor is driven at such a lower speed than normal, even in case that the operation state of the motor of the refrigerator is improved so that the motor can be driven at the initial command speed.
- Driving the motor at the lower speed may cause decrease of a cooling speed of the refrigerator, thereby decreasing refrigeration efficiency.
- a refrigerator having a compressor
- the refrigerator including: a motor driving the compressor; a motor driver supplying power to the motor; and a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period.
- the speed of the motor increases as the driving on/off ratio increases.
- the controller outputs a control signal corresponding to a command speed lower than a given command speed to the motor driver when the speed of the motor does not reach the given command speed even though the driving on/off ratio is maximized.
- the controller when the speed of the motor reaches the first command speed, the controller increases the reference driving on/off ratio.
- the controller when the speed of the motor reaches the first command speed, the controller reduces the reference period.
- the controller when the speed of the motor does not reach the first command speed, the controller reduces the reference driving on/off ratio.
- the controller when the speed of the motor does not reach the first command speed, the controller increases the reference period.
- the motor driver includes an inverter having a switching element, and the driving on/off ratio can be replaced with a duty ratio of the switching element.
- a method for controlling a refrigerator having a motor and a motor driver driving the motor including: outputting a control signal corresponding to a second command speed to the motor driver; determining whether a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period; and outputting a control signal corresponding to a first command speed which is higher than the second command speed when it is determined that the driving on/off ratio is maintained for the given reference period.
- the method further includes increasing the reference driving on/off ratio when the speed of the motor reaches the first command speed.
- the method further includes decreasing the reference period when the speed of the motor reaches the first command speed.
- the above method further includes reducing the reference driving on/off ratio when the speed of the motor does not reach the first command speed.
- the above method further includes increasing the reference period when the speed of the motor does not reach the first command speed.
- FIG. 1 is a control block diagram of a refrigerator according to an embodiment of the present invention.
- FIG. 2 is a control flowchart showing a method for controlling the refrigerator according to the embodiment of the present invention.
- FIG. 1 is a control block diagram of a refrigerator according to an embodiment of the present invention.
- a refrigerator 1 includes a compressor 10 , a motor 20 driving the compressor 10 , a motor driver 30 supplying power to the motor 20 , and a controller 40 controlling the motor driver 30 .
- the compressor 10 of the refrigerator 1 compresses a refrigerant with a high temperature and a high pressure.
- the compressor 10 includes a piston connected to the motor 20 , and the refrigerant is repeatedly compressed and expanded by iterative linear motion of the piston according to rotation of the motor 20 .
- the motor 20 may be provided as a brushless direct current (DC) motor.
- the motor 20 drives the compressor 10 using power supplied from the motor driver 30 .
- the speed of the motor 20 is determined by the controller 40 and the motor driver 30 , and may vary depending on ambient environment of the refrigerator.
- the speed of the motor 20 varies depending on ambient temperature of the refrigerator, a current temperature in the refrigerator, and a preset temperature.
- a residual pressure in the motor 20 also may cause variation of the motor speed.
- the compressor 10 may be driven at a high speed in order to increase a cooling speed when the ambient temperature of the refrigerator is relatively high or a difference between temperature in the refrigerator and a preset temperature is not within a predetermined allowable range, whereas the compressor 10 is driven at a low speed in order to maintain the cooling speed properly when the ambient temperature of the refrigerator is relatively low or the difference between the temperature in the refrigerator and the set temperature is within the predetermined allowable range.
- the motor driver 30 supplies power to the motor 20 for driving the motor 20 , and the controller 40 controls a driving on/off ratio.
- the motor driver 30 includes a converter (not shown) and an inverter inverting a direct current power output from the converter to an alternate current power input to the motor 20 .
- the converter converts the alternate current power to the direct current power and the direct current power is switched in accordance with a given control signal by the inverter.
- the inverter includes a plurality of switching elements, each of which is repeatedly turned on/off according to a pulse width modulation (PWM) control signal output from the controller 40 .
- the driving on/off ratio is understood as the ratio of an on-period of the switching element to an off-period of the switching element. That is, more power is supplied to the motor 20 as the driving on/off ratio increases, thereby increasing the speed of the motor 20 .
- a reference value for the on-period can be changed as long as such a relationship between the driving on/off ratio and the speed of the motor 20 is satisfied.
- the driving on/off ratio according to the embodiment of the present invention can be replaced with a duty ratio of the switching element of the inverter, which represents the ratio of the on-period to one on/off cycle of the switching element.
- the power supplied to the motor 20 increases as the duty ratio of the switching element increases, thereby increasing the speed of the motor 20 .
- the controller 40 detects the state of the refrigerator 1 and the speed of the motor 20 to control the speed on the motor 20 in accordance with the state of the refrigerator 1 and outputs a control signal corresponding to a given speed command to the motor driver 30 based on the state of the refrigerator 1 and the speed of the motor 20 .
- the control signal output from the controller 40 includes a PWM control signal for controlling the switching element of the inverter.
- the controller 40 outputs a control signal corresponding to the command speed higher than the speed of the motor 20 that has been driven at the rated voltage.
- the speed of the motor 20 to overcome the load torque is referred to as a first command speed.
- the controller 40 When the controller 40 outputs a control signal corresponding to the first command speed to the motor driver 30 , the motor driver 30 switches the switching element of the inverter. However, when the speed of the motor 20 does not reach the first command speed due to the load torque even though the driving on/off ratio is maximized, in other words, the duty ratio of the switching element is 100%, the controller 40 outputs a control signal corresponding to a second command speed which is lower than the first command speed. As a result, noise that can be generated from the refrigerator is reduced and occurrence of a defect due to overdriving the motor 20 can be prevented.
- the controller 40 determines whether the driving on/off ratio of the motor driver 30 can be maintained at a lower value than a given reference driving on/off ratio for a given reference period. In more detail, it can be implied that the motor 20 can be fully driven at the second command speed when the driving on/off ratio is maintained at the given reference driving on/off ratio rather than at 100%, for example, below 80% for the reference period.
- the controller 40 determines that the load torque of the motor 20 is reduced and outputs a control signal corresponding to the first command speed.
- the controller 40 When the speed of the motor 20 does not reach the second command speed even though the speed of the motor 20 is reduced to the second command speed and the power is fully supplied to the motor 20 , the controller 40 outputs a control signal corresponding to the speed lower than the second command speed and the above-described process is repeatedly performed.
- the control signal corresponding to the second command speed lower than the first command speed is output and the speed of the motor 20 is maintained at the second command speed, and as a result, a cooling speed of the refrigerator is decreased.
- the speed of the motor 20 can be restored to the first command speed depending on the state of the motor 20 .
- the controller 40 increases the reference driving on/off ratio or decreases the reference period. Variations of such a driving condition for the motor 20 are for preventing noise that can be generated when the speed of the motor 20 is changed and for stably driving the motor 20 when the speed of the motor 20 is repeatedly changed.
- the speed of the motor 20 that has been reached the first command speed can be reduced to the second command speed.
- the reference driving on/off ratio is increased to 90% from 80% when the speed of the motor 20 is reduced from the first command speed to the second command speed.
- the speed of the motor 20 can be promptly changed from the second command speed to the first command speed by reducing the reference period of the second command speed.
- the controller 40 can reduce the reference driving on/off ratio to 70% from 80% or increase the reference period.
- the speed of the motor 20 does not reach the first command speed even though the control signal corresponding to the first command speed is output to the motor driver when the reference driving on/off ratio is set relatively too high or a residual load torque of the motor is relatively high. Therefore, the controller 40 may reduce the reference driving on/off ratio to alleviate a condition that causes the speed of the motor 20 to be consistently maintained at the second command speed, or increase the reference period until the load torque of the motor 20 is significantly reduced.
- Such an additional control of the controller 40 can prevent the motor 20 from being driven abnormally between the first command speed and the second command speed and reduce noise and vibration that can be generated when the speed of the motor 20 is changed.
- the controller 40 is activated when load torque exists in the motor 20 and when an initial power voltage input to the refrigerator is lower than as normal and thus the motor 20 is driven at relatively high speed.
- the controller 40 determines the state of the refrigeration and controls the motor driver 30 according to the embodiment of the present invention.
- the controller 40 can be provided two controllers for controlling the overall state of the refrigerator by sensing temperature of the refrigerator and for controlling the motor driver 30 respectively and the motor 20 can be controlled by communication between the two controllers.
- FIG. 2 is a control flowchart showing a method for controlling a refrigerator according to the embodiment of the present invention. The method for controlling the refrigerator will now be described with reference to FIG. 2 .
- a control signal corresponding to a first command speed is output (S 10 ).
- the first command speed is higher than a normal speed of the motor 20 .
- the controller 40 When the driving on/off ratio is determined to be maximized, it is determined whether or not the speed of the motor 20 reaches the first command speed (S 30 ). When the speed of the motor 20 does not reach the first command speed even though the driving on/off ratio is maximized, the controller 40 outputs a control signal corresponding to a second command speed which is lower than the first command speed in order to prevent noise and vibration from being generated from the motor 20 and reduce load on the motor 20 (S 40 ).
- the controller 40 outputs the control signal corresponding to the first command speed again (S 60 ). This means that the motor 20 is in the state of being able to reach the first command speed.
- the controller 40 After outputting the control signal corresponding to the first command speed, the controller 40 determines whether the speed of the motor 20 reaches the first command speed (S 70 ).
- the driving on/off ratio is reduced so that the speed of the motor 20 can easily reach the first command speed or the reference period of the second command speed is increased so that load torque of the motor 20 can be significantly reduced (S 80 ).
- the driving on/off ratio is increased in order to prevent repetitive operation of the motor between the first command speed and the second command speed or the reference period of the second command speed is reduced when the load torque of the motor 20 is determined to be significantly reduced (S 90 ).
- a refrigerator and a method for controlling the refrigerator according to the present invention can drive a compressor stably and easily even under overload or low voltage conditions.
Abstract
The invention provides a refrigerator having a compressor, the refrigerator including: a motor driving the compressor; a motor driver supplying power to the motor; and a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period. Accordingly, it is an aspect of the present invention to provide a refrigerator to operate a compressor stably and easily under overload or low voltage conditions, and a method for controlling the same.
Description
- This application claims priority from Korean Patent Application No. 2005-0111786, filed on Nov. 22, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a refrigerator and a method for controlling the same, and more particularly, to a refrigerator in which an operation state of a compressor is changed in accordance with external conditions.
- 2. Description of the Related Art
- Generally, a refrigerator includes a compressor which compresses or expands a refrigerant by using a piston connected to a motor. The speed of the motor driving the compressor is controlled depending on an ambient environment.
- When ambient temperature of the refrigerator is relatively high or when the refrigerator that has been in the state of being turned off for a long period of time is turned on, the motor speed is rapidly increased compared with a normal speed in order to overcome load torque that resists operation of the motor.
- However, it is difficult for the motor speed to reach a given command speed mostly due to the load torque. Thus, the motor is driven at a command speed lower than the initially given command speed in order to reduce generation of noise and vibration.
- However, the motor is driven at such a lower speed than normal, even in case that the operation state of the motor of the refrigerator is improved so that the motor can be driven at the initial command speed. Driving the motor at the lower speed may cause decrease of a cooling speed of the refrigerator, thereby decreasing refrigeration efficiency.
- Accordingly, it is an aspect of the present invention to provide a refrigerator that operates a compressor stably and easily under overload or low voltage conditions, and a method for controlling the same.
- Additional features of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.
- The foregoing and/or other aspects of the present invention can be achieved by providing a refrigerator having a compressor, the refrigerator including: a motor driving the compressor; a motor driver supplying power to the motor; and a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period.
- According to an aspect of the present invention, the speed of the motor increases as the driving on/off ratio increases.
- According to an aspect of the present invention, the controller outputs a control signal corresponding to a command speed lower than a given command speed to the motor driver when the speed of the motor does not reach the given command speed even though the driving on/off ratio is maximized.
- According to an aspect of the present invention, when the speed of the motor reaches the first command speed, the controller increases the reference driving on/off ratio.
- According to an aspect of the present invention, when the speed of the motor reaches the first command speed, the controller reduces the reference period.
- According to an aspect of the present invention, when the speed of the motor does not reach the first command speed, the controller reduces the reference driving on/off ratio.
- According to an aspect of the present invention, when the speed of the motor does not reach the first command speed, the controller increases the reference period.
- According to an aspect of the present invention, the motor driver includes an inverter having a switching element, and the driving on/off ratio can be replaced with a duty ratio of the switching element.
- The foregoing and/or other aspects of the present invention can be achieved by providing a method for controlling a refrigerator having a motor and a motor driver driving the motor, the method including: outputting a control signal corresponding to a second command speed to the motor driver; determining whether a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period; and outputting a control signal corresponding to a first command speed which is higher than the second command speed when it is determined that the driving on/off ratio is maintained for the given reference period.
- According to an aspect of the present invention, the method further includes increasing the reference driving on/off ratio when the speed of the motor reaches the first command speed.
- According to an aspect of the present invention, the method further includes decreasing the reference period when the speed of the motor reaches the first command speed.
- According to an aspect of the present invention, the above method further includes reducing the reference driving on/off ratio when the speed of the motor does not reach the first command speed.
- According to an aspect of the present invention, the above method further includes increasing the reference period when the speed of the motor does not reach the first command speed.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The above and/or other aspects and advantages of the prevent invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompany drawings, in which:
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FIG. 1 is a control block diagram of a refrigerator according to an embodiment of the present invention. -
FIG. 2 is a control flowchart showing a method for controlling the refrigerator according to the embodiment of the present invention. - Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below so as to explain the present invention by referring to the figure.
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FIG. 1 is a control block diagram of a refrigerator according to an embodiment of the present invention. - As shown in
FIG. 1 , a refrigerator 1 includes acompressor 10, amotor 20 driving thecompressor 10, amotor driver 30 supplying power to themotor 20, and acontroller 40 controlling themotor driver 30. - The
compressor 10 of the refrigerator 1 compresses a refrigerant with a high temperature and a high pressure. Thecompressor 10 includes a piston connected to themotor 20, and the refrigerant is repeatedly compressed and expanded by iterative linear motion of the piston according to rotation of themotor 20. - The
motor 20 may be provided as a brushless direct current (DC) motor. Themotor 20 drives thecompressor 10 using power supplied from themotor driver 30. The speed of themotor 20 is determined by thecontroller 40 and themotor driver 30, and may vary depending on ambient environment of the refrigerator. - For example, the speed of the
motor 20 varies depending on ambient temperature of the refrigerator, a current temperature in the refrigerator, and a preset temperature. Also a residual pressure in themotor 20 also may cause variation of the motor speed. For example, thecompressor 10 may be driven at a high speed in order to increase a cooling speed when the ambient temperature of the refrigerator is relatively high or a difference between temperature in the refrigerator and a preset temperature is not within a predetermined allowable range, whereas thecompressor 10 is driven at a low speed in order to maintain the cooling speed properly when the ambient temperature of the refrigerator is relatively low or the difference between the temperature in the refrigerator and the set temperature is within the predetermined allowable range. - Meanwhile, it consumes a lot of power to decrease the temperature in the refrigerator when the temperature in the refrigerator is significantly high or the refrigerator that has been turned off for a long period time is turned on. When the
compressor 10 is driven under such an overloaded refrigeration cycle, a pressure difference between a delivery unit (outlet) and a suction unit (inlet) of thecompressor 10 significantly increases thereby causing high torque load of themotor 20 driving thecompressor 10. Such high torque load causes the speed of themotor 20 to be increased. - The
motor driver 30 supplies power to themotor 20 for driving themotor 20, and thecontroller 40 controls a driving on/off ratio. Themotor driver 30 includes a converter (not shown) and an inverter inverting a direct current power output from the converter to an alternate current power input to themotor 20. - The converter converts the alternate current power to the direct current power and the direct current power is switched in accordance with a given control signal by the inverter.
- The inverter includes a plurality of switching elements, each of which is repeatedly turned on/off according to a pulse width modulation (PWM) control signal output from the
controller 40. The driving on/off ratio is understood as the ratio of an on-period of the switching element to an off-period of the switching element. That is, more power is supplied to themotor 20 as the driving on/off ratio increases, thereby increasing the speed of themotor 20. A reference value for the on-period can be changed as long as such a relationship between the driving on/off ratio and the speed of themotor 20 is satisfied. - Therefore, the driving on/off ratio according to the embodiment of the present invention can be replaced with a duty ratio of the switching element of the inverter, which represents the ratio of the on-period to one on/off cycle of the switching element. The power supplied to the
motor 20 increases as the duty ratio of the switching element increases, thereby increasing the speed of themotor 20. - The
controller 40 detects the state of the refrigerator 1 and the speed of themotor 20 to control the speed on themotor 20 in accordance with the state of the refrigerator 1 and outputs a control signal corresponding to a given speed command to themotor driver 30 based on the state of the refrigerator 1 and the speed of themotor 20. The control signal output from thecontroller 40 includes a PWM control signal for controlling the switching element of the inverter. - As described above, when the refrigeration cycle is driven under overload and thus load torque of the
motor 20 increases, a voltage higher than a rated voltage should be supplied to themotor 20. Thus, thecontroller 40 outputs a control signal corresponding to the command speed higher than the speed of themotor 20 that has been driven at the rated voltage. Hereinafter, the speed of themotor 20 to overcome the load torque is referred to as a first command speed. - When the
controller 40 outputs a control signal corresponding to the first command speed to themotor driver 30, themotor driver 30 switches the switching element of the inverter. However, when the speed of themotor 20 does not reach the first command speed due to the load torque even though the driving on/off ratio is maximized, in other words, the duty ratio of the switching element is 100%, thecontroller 40 outputs a control signal corresponding to a second command speed which is lower than the first command speed. As a result, noise that can be generated from the refrigerator is reduced and occurrence of a defect due to overdriving themotor 20 can be prevented. - After the control signal corresponding to the second command speed is output, the
controller 40 determines whether the driving on/off ratio of themotor driver 30 can be maintained at a lower value than a given reference driving on/off ratio for a given reference period. In more detail, it can be implied that themotor 20 can be fully driven at the second command speed when the driving on/off ratio is maintained at the given reference driving on/off ratio rather than at 100%, for example, below 80% for the reference period. - When the
motor 20 has been driven at the second command speed, which is lower than the first command speed, for a period longer than the reference period, thecontroller 40 determines that the load torque of themotor 20 is reduced and outputs a control signal corresponding to the first command speed. - When the speed of the
motor 20 does not reach the second command speed even though the speed of themotor 20 is reduced to the second command speed and the power is fully supplied to themotor 20, thecontroller 40 outputs a control signal corresponding to the speed lower than the second command speed and the above-described process is repeatedly performed. - According to the prior art, the control signal corresponding to the second command speed lower than the first command speed is output and the speed of the
motor 20 is maintained at the second command speed, and as a result, a cooling speed of the refrigerator is decreased. However, according to the present invention, the speed of themotor 20 can be restored to the first command speed depending on the state of themotor 20. - When the speed of the
motor 20 reaches the first command speed by the control signal corresponding to the first command speed, thecontroller 40 increases the reference driving on/off ratio or decreases the reference period. Variations of such a driving condition for themotor 20 are for preventing noise that can be generated when the speed of themotor 20 is changed and for stably driving themotor 20 when the speed of themotor 20 is repeatedly changed. - That is, the speed of the
motor 20 that has been reached the first command speed can be reduced to the second command speed. In order to avoid the iterative changes in the motor speed and stably drive themotor 20, the reference driving on/off ratio is increased to 90% from 80% when the speed of themotor 20 is reduced from the first command speed to the second command speed. In addition, the speed of themotor 20 can be promptly changed from the second command speed to the first command speed by reducing the reference period of the second command speed. - When the speed of the
motor 20 does not reach the first command speed, thecontroller 40 can reduce the reference driving on/off ratio to 70% from 80% or increase the reference period. The speed of themotor 20 does not reach the first command speed even though the control signal corresponding to the first command speed is output to the motor driver when the reference driving on/off ratio is set relatively too high or a residual load torque of the motor is relatively high. Therefore, thecontroller 40 may reduce the reference driving on/off ratio to alleviate a condition that causes the speed of themotor 20 to be consistently maintained at the second command speed, or increase the reference period until the load torque of themotor 20 is significantly reduced. - Such an additional control of the
controller 40 can prevent themotor 20 from being driven abnormally between the first command speed and the second command speed and reduce noise and vibration that can be generated when the speed of themotor 20 is changed. - The
controller 40 is activated when load torque exists in themotor 20 and when an initial power voltage input to the refrigerator is lower than as normal and thus themotor 20 is driven at relatively high speed. - In terms of functional aspects, the
controller 40 determines the state of the refrigeration and controls themotor driver 30 according to the embodiment of the present invention. However, there can be provided two controllers for controlling the overall state of the refrigerator by sensing temperature of the refrigerator and for controlling themotor driver 30 respectively and themotor 20 can be controlled by communication between the two controllers. -
FIG. 2 is a control flowchart showing a method for controlling a refrigerator according to the embodiment of the present invention. The method for controlling the refrigerator will now be described with reference toFIG. 2 . - When the refrigerator is in the state of being overloaded or a power voltage is respectively low, a control signal corresponding to a first command speed is output (S10). At this time, the first command speed is higher than a normal speed of the
motor 20. After a given period, it is determined whether a driving on/off ratio of themotor driver 30 is maximized (S20). - When the driving on/off ratio is not maximized, it can be understood that the
motor 20 is driven at the first command speed. - When the driving on/off ratio is determined to be maximized, it is determined whether or not the speed of the
motor 20 reaches the first command speed (S30). When the speed of themotor 20 does not reach the first command speed even though the driving on/off ratio is maximized, thecontroller 40 outputs a control signal corresponding to a second command speed which is lower than the first command speed in order to prevent noise and vibration from being generated from themotor 20 and reduce load on the motor 20 (S40). - Subsequently, it is determined whether the driving on/off ratio of the
motor driver 30 is maintained below a reference driving on/off ratio for a reference period (S50). When it is maintained for the reference period, thecontroller 40 outputs the control signal corresponding to the first command speed again (S60). This means that themotor 20 is in the state of being able to reach the first command speed. - After outputting the control signal corresponding to the first command speed, the
controller 40 determines whether the speed of themotor 20 reaches the first command speed (S70). - When it is determined that the speed of the
motor 20 does not reach the first command speed, the driving on/off ratio is reduced so that the speed of themotor 20 can easily reach the first command speed or the reference period of the second command speed is increased so that load torque of themotor 20 can be significantly reduced (S80). - However, when the speed of the
motor 20 reaches the first command speed, the driving on/off ratio is increased in order to prevent repetitive operation of the motor between the first command speed and the second command speed or the reference period of the second command speed is reduced when the load torque of themotor 20 is determined to be significantly reduced (S90). - As described above, a refrigerator and a method for controlling the refrigerator according to the present invention can drive a compressor stably and easily even under overload or low voltage conditions.
- Although a few exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (15)
1. A refrigerator having a compressor, the refrigerator comprising:
a motor driving the compressor;
a motor driver supplying power to the motor; and
a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period.
2. The refrigerator of claim 1 , wherein the speed of the motor increases as the driving on/off ratio increases.
3. The refrigerator of claim 1 , wherein the controller outputs a control signal corresponding to a command speed lower than a given command speed to the motor driver when the speed of the motor does not reach the given command speed even though the driving on/off ratio is maximized.
4. The refrigerator of claim 1 , wherein when the speed of the motor reaches the first command speed, the controller increases the reference driving on/off ratio.
5. The refrigerator of claim 1 , wherein when the speed of the motor reaches the first command speed, the controller reduces the reference period.
6. The refrigerator of claim 1 , wherein when the speed of the motor does not reach the first command speed, the controller reduces the reference driving on/off ratio.
7. The refrigerator of claim 1 , wherein when the speed of the motor does not reach the first command speed, the controller increases the reference period.
8. The refrigerator of claim 1 , wherein the motor driver comprises an inverter having a switching element, and the driving on/off ratio can be replaced with a duty ratio of the switching element.
9. A method for controlling a refrigerator having a motor and a motor driver driving the motor, the method comprising:
outputting a control signal corresponding to a second command speed to the motor driver;
determining whether a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period; and
outputting a control signal corresponding to a first command speed which is higher than the second command speed when it is determined that the driving on/off ratio is maintained for the given reference period.
10. The method of claim 9 , further comprising increasing the reference driving on/off ratio when the speed of the motor reaches the first command speed.
11. The method of claim 9 , further comprising decreasing the reference period when the speed of the motor reaches the first command speed.
12. The method of claim 9 , further comprising reducing the reference driving on/off ratio when the speed of the motor does not reach the first command speed.
13. The method of claim 9 , further comprising increasing the reference period when the speed of the motor does not reach the first command speed.
14. A method for controlling a refrigerator having a compressor, the compressor being driven by a motor and a motor driver driving the motor, the method comprising:
outputting a first command speed to the motor driver, the first command speed being higher than a normal speed of the motor; and
determining whether a driving on/off ratio of the motor driver is maximized and if the driving on/off ratio of the motor driver is not maximized outputting a second command speed which is lower than the first command speed.
15. The method of claim 14 , further comprising outputting the first command speed when it is determined that the driving on/off ratio is maintained for a reference period when driven at the second command speed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050111786A KR20070053939A (en) | 2005-11-22 | 2005-11-22 | Refrigerator and control method of the same |
KR2005-111786 | 2005-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070113569A1 true US20070113569A1 (en) | 2007-05-24 |
Family
ID=38052136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/591,536 Abandoned US20070113569A1 (en) | 2005-11-22 | 2006-11-02 | Refrigerator and control method of the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070113569A1 (en) |
KR (1) | KR20070053939A (en) |
CN (1) | CN1971181A (en) |
Cited By (3)
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US20080173034A1 (en) * | 2007-01-19 | 2008-07-24 | Hallowell International, Llc | Heat pump apparatus and method |
US20080314056A1 (en) * | 2005-11-09 | 2008-12-25 | Marcio Roberto Thiessen | Linear-Compressor Control System, a Method of Controlling a Linear Compressor and a Linear Compressor |
US10753675B2 (en) | 2016-01-29 | 2020-08-25 | Samsung Electronics Co., Ltd. | Refrigerator and method of controlling the same |
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Also Published As
Publication number | Publication date |
---|---|
CN1971181A (en) | 2007-05-30 |
KR20070053939A (en) | 2007-05-28 |
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