CN113883703B - Indoor unit of air conditioner - Google Patents
Indoor unit of air conditioner Download PDFInfo
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- CN113883703B CN113883703B CN202111234220.7A CN202111234220A CN113883703B CN 113883703 B CN113883703 B CN 113883703B CN 202111234220 A CN202111234220 A CN 202111234220A CN 113883703 B CN113883703 B CN 113883703B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner indoor unit, which comprises a high-voltage direct current circuit, a low-voltage direct current circuit, an electric signal detection circuit, a direct current fan, an electronic expansion valve and a controller, wherein the high-voltage direct current circuit is connected with the electric signal detection circuit; the high-voltage direct current circuit is respectively connected with the low-voltage direct current circuit, the electric signal detection circuit and the direct current fan; the controller is respectively connected with the direct current fan, the low-voltage direct current circuit and the electronic expansion valve and respectively controls the power supply and the operation of the direct current fan and the electronic expansion valve; the electric signal detection circuit detects a voltage signal or a current signal and transmits the voltage signal or the current signal to the controller; and the controller judges whether the power is off or not, and when the power is off, the controller controls the direct current fan to stop running and the electronic expansion valve to be closed. When the power is off, the direct current fan is controlled to stop running, the electric quantity stored by the high-voltage direct current circuit supplies power to the controller and the electronic expansion valve, the electronic expansion valve is controlled to be closed, the refrigerant circulation is cut off, and condensation around the evaporator and liquid impact of the compressor are prevented.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner indoor unit.
Background
When the power of the indoor unit of the air conditioner is lost, the coil of the electronic expansion valve is simultaneously lost, the valve body cannot be driven to be closed, and the opening degree of the valve is kept in a state before power failure. After power failure, the refrigerant continuously flows in the evaporator of the indoor unit under the action of the pressure difference between the indoor unit and the outdoor unit of the air conditioner. Because the fan of the air conditioner indoor unit is powered down simultaneously and cannot operate, the temperature of the evaporator of the indoor unit is rapidly reduced, water vapor condensation in the air around the evaporator forms water drops to drop out of the indoor unit, and the use experience of a user is affected. In addition, since the outdoor unit is still operating and the refrigerant in the evaporator of the indoor unit is still in a liquid state, it may return to the compressor during the refrigeration cycle, causing the compressor to be fluctuated and damaged.
Currently, a standby power supply, a battery or an Uninterruptible Power Supply (UPS) is additionally added to an indoor unit, so that power supply after power failure is provided for the indoor unit, and the electronic expansion valve is controlled to be closed. The above-mentioned standby power supply, battery or Uninterruptible Power Supply (UPS) and the like have no other uses when the indoor unit is normally operated, increasing the cost of the indoor unit of the air conditioner.
Disclosure of Invention
The invention provides an air conditioner indoor unit, which aims to solve the problems of poor user experience, compressor damage or cost increase of the air conditioner indoor unit caused by power failure of the indoor unit in the prior art, and solves the problems of condensation and compressor damage around an evaporator during power failure on the premise of not increasing hardware, so that the user experience is improved, and the cost is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides an air conditioner indoor unit which comprises a high-voltage direct current circuit, a low-voltage direct current circuit, an electric signal detection circuit, a direct current fan, an electronic expansion valve, a controller and at least one low-voltage load, wherein the high-voltage direct current circuit is connected with the electric signal detection circuit;
the high-voltage direct current circuit is respectively connected with the low-voltage direct current circuit, the electric signal detection circuit and the direct current fan; the controller is respectively connected with the direct current fan, the low-voltage direct current circuit, the electronic expansion valve and the low-voltage load and respectively controls the power supply and the operation of the direct current fan, the electronic expansion valve and the low-voltage load;
the electric signal detection circuit detects a voltage signal or a current signal and transmits the voltage signal or the current signal to the controller; the controller judges whether power is off or not according to the received voltage signal or the received current signal; and when the controller judges that the power is off, controlling the direct current fan and the low-voltage load to stop running, and controlling the electronic expansion valve to be closed.
In one embodiment, the electric signal detection circuit includes a dc voltage detection circuit that detects a voltage of the high voltage dc circuit, denoted as a dc voltage, and transmits the detected dc voltage to the controller;
the controller is configured with a power-down slope limit value and a normal voltage; the controller calculates a power-down slope according to the direct-current voltage, and compares the power-down slope with the power-down slope limit value, the direct-current voltage and the normal voltage;
and when the power-down slope is larger than the power-down slope limit value and the direct-current voltage is smaller than the normal voltage, controlling the direct-current fan to run in a down-conversion mode.
In an embodiment, when the direct current fan is in down-conversion operation, the down-conversion rate of the direct current fan is positively correlated with the power-down slope.
In one embodiment, the controller is configured with an undervoltage limit value, and judges whether to power off according to the direct current voltage and the undervoltage limit value;
and when the direct-current voltage is smaller than the undervoltage limit value, the controller judges that the power is off, controls the direct-current fan and the low-voltage load to stop running, and controls the electronic expansion valve to be closed.
In one embodiment, the electric signal detection circuit further comprises an ac detection circuit, which is connected with the controller and the high-voltage dc circuit, and is used for detecting an electric signal of the power supply ac connected with the high-voltage dc circuit;
the alternating current detection circuit sends the electric signal to the controller; the controller judges whether power is off or not according to the electric signal;
and when the controller judges that the power is off, the direct current fan and the low-voltage load are controlled to stop running, and the electronic expansion valve is controlled to be closed.
In some embodiments, the outdoor unit further comprises a communication module connected with the controller and used for being in communication connection with the outdoor unit;
when the controller judges that the power is off, the communication module is controlled to send a power-off signal for the outdoor unit to control the compressor to stop running;
and the controller controls the communication module to stop working after finishing the power-off signal transmission.
In some embodiments, a power down memory is also included, connected with the controller;
when the controller judges that the power is off, the power-off storage is controlled to store the set states of the direct-current fan, the electronic expansion valve and the low-voltage load before the power is off;
and when the electric signal or the direct current voltage is recovered to be normal in a short time and kept for a prescribed time, the controller controls the direct current fan, the electronic expansion valve and the low-voltage load to recover to the set state operation before power failure.
In some embodiments, the device further comprises a frequency converter connected with the high-voltage direct current circuit, the direct current fan and the controller respectively;
the controller controls the connection or disconnection of each path of the frequency converter, and changes the connection state of the high-voltage direct-current circuit and the direct-current fan;
when the controller judges that the power is off, the controller controls the connection or disconnection of each path of the frequency converter, so that the direct current fan stops running, and the counter electromotive force of the direct current fan charges the high-voltage direct current circuit.
In some embodiments, a current detection circuit is also included; the high-voltage direct-current circuit comprises a direct-current bus electrolytic capacitor which is connected with the frequency converter;
the current detection circuit is respectively connected with the controller, the frequency converter and the direct current bus electrolytic capacitor and is used for detecting the current between the frequency converter and the direct current bus electrolytic capacitor and transmitting the current to the controller;
the controller is configured with a voltage predetermined value and a current predetermined value; when the direct current fan stops running, the controller controls the duty ratio of the passage of the frequency converter according to the rotating speed of the direct current fan, so that the voltage of the direct current bus electrolytic capacitor does not exceed the voltage preset value and the charging current does not exceed the current preset value.
In some embodiments, the controller is configured with a low current threshold and compares the current between the frequency converter and the dc bus electrolytic capacitor to the low current threshold;
and when the voltage of the direct current bus electrolytic capacitor is not increased any more or the current supplied to the direct current bus electrolytic capacitor by the back electromotive force is smaller than the current low threshold value, the controller controls the switching-off of the passage of the frequency converter.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the air conditioner indoor unit, when the power failure is judged, the direct-current fan and the low-voltage load are controlled to stop running, so that the electric quantity stored in the high-voltage direct-current circuit is only supplied to the controller and the electronic expansion valve, the controller controls the electronic expansion valve to be closed, the power failure is detected and the electronic expansion valve is controlled to be closed under the condition that no additional circuit or power supply is added to the air conditioner indoor unit, the circulation of a refrigerant is cut off, condensation around the evaporator and liquid impact of the compressor caused by rapid cooling of the evaporator and low temperature maintenance are prevented, user experience is improved, the compressor is protected, and the service life of the compressor is prolonged; in addition, no additional circuit and/or power supply is added, the service life of the compressor is prolonged, resources are saved, and cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of an embodiment of an indoor unit of an air conditioner according to the present invention;
fig. 2 is a schematic diagram showing a dc voltage drop of an embodiment of an indoor unit of an air conditioner according to the present invention;
FIG. 3 is a schematic control timing diagram of an indoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a schematic control timing diagram of an indoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 5 is a control flow diagram of an embodiment of an indoor unit of an air conditioner according to the present invention;
fig. 6 is a schematic circuit diagram of an embodiment of an indoor unit of an air conditioner according to the present invention;
FIG. 7 is a schematic diagram illustrating a control sequence of an indoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 8 is a control flow diagram of an embodiment of an indoor unit of an air conditioner according to the present invention;
fig. 9 is a schematic circuit diagram of an embodiment of an indoor unit of an air conditioner according to the present invention;
fig. 10 is a schematic diagram of the back emf charging the dc bus electrolytic capacitor.
Reference numerals:
1. a high voltage DC circuit; 2. a low voltage DC circuit; 31. a DC voltage detection circuit; 32. an alternating current detection circuit; 4. a direct current fan; 5. a controller; 6. a low voltage load; 7. an electronic expansion valve; 8. a communication module; 9. a frequency converter; 10. a frequency converter driving circuit; 20. an electronic expansion valve driving circuit; 30. a current detection circuit; 40. a power down memory;
c1, a direct current bus electrolytic capacitor; DM1, a rectifying circuit; v (V) dc A direct current voltage.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, 3, 4, 5, 6, 7, 8 and 9, an air conditioner indoor unit according to the present invention includes a high-voltage dc circuit 1, a low-voltage dc circuit 2, an electric signal detection circuit, a dc fan 4, an electronic expansion valve 7, a controller 5, and at least one low-voltage load 6.
The high-voltage direct current circuit 1 is connected with power supply alternating current, converts the alternating current into stable high-voltage direct current and outputs the stable high-voltage direct current, and comprises an energy storage element for filtering. The high-voltage direct current circuit 1 is respectively connected with the low-voltage direct current circuit 2, the electric signal detection circuit and the direct current fan 4; the controller 5 is respectively connected with the electric signal detection circuit, the direct current fan 4, the low-voltage direct current circuit 2, the electronic expansion valve 7 and the low-voltage load 6, and respectively controls the power supply and the operation of the direct current fan 4, the electronic expansion valve 7 and the low-voltage load 6.
The electric signal detection circuit detects a voltage signal or a current signal and transmits the voltage signal or the current signal to the controller 5; the controller 5 judges whether the power is off or not according to the received voltage signal or current signal; when the controller 5 judges that the power is off, the direct-current fan 4 and the low-voltage load 6 are controlled to stop supplying power and running, and the electronic expansion valve 7 is controlled to be closed.
The air conditioner indoor unit detects a voltage signal or a current signal of a circuit through the electric signal detection circuit, and judges whether power is off or not through the controller 5 according to the voltage signal or the current signal; can be detected during the power-off process. When the controller 5 judges that the power is off and the power is not completely off in practice, the high-power consumption direct current fan 4 is controlled to stop running, and the low-voltage load 6 can be controlled to stop running simultaneously or later, so that the electric energy stored in the high-voltage direct current circuit 1 only supplies power for the controller 5 and the electronic expansion valve 7; it is realized that when the controller 5 controls the electronic expansion valve 7 to be closed, it is possible to satisfy the complete closing of the electronic expansion valve 7.
When the indoor unit of the air conditioner is powered off, the electronic expansion valve 7 can be closed, so that the refrigerant in the still-running outdoor unit stops circulating into the evaporator of the indoor unit, the evaporator of the indoor unit is prevented from being rapidly cooled down to cause ambient condensation due to the stop operation of the direct current fan 4, and the user experience is improved; in addition, the electronic expansion valve 7 is closed, the circulation of the refrigerant of the indoor unit and the refrigerant of the outdoor unit are cut off, the liquid refrigerant which passes through the evaporator without evaporation is reduced to return to the compressor, the liquid impact of the compressor is avoided, the compressor is protected, and the service life of the compressor is prolonged.
According to the invention, the service life of the compressor is prolonged, and the power-off electronic expansion valve 7 is closed without adding an additional detection circuit and power supply equipment, so that the user experience is improved and the maintenance cost is reduced on the premise of not increasing the cost of the indoor unit of the air conditioner.
In some embodiments, referring to fig. 1, 6 and 9, the hvdc circuit 1 includes a rectifying circuit DM1, a dc bus electrolytic capacitor C1; the rectifier circuit DM1 is connected to the power supply ac power, and rectifies the power supply ac power. The direct current bus electrolytic capacitor C1 is connected with the rectifying circuit DM1, filters the voltage and the current output by the rectifying circuit DM1, and reduces the ripple wave to output stable high-voltage direct current.
The direct current bus electrolytic capacitor C1 is a large-capacity capacitor and has certain electricity storage capacity.
In some embodiments, referring to fig. 1, 6 and 9, the low-voltage dc circuit 2 is a switching power supply circuit, which is connected to the high-voltage dc circuit 1, generates 5V, 12V and 15V voltages and outputs them for powering the controller 5 and providing power to the low-voltage load 6 and the electronic expansion valve 7.
In some embodiments, referring to fig. 1, 2, 3, 4, 5, 6 and 9, the electrical signal detection circuit includes a dc voltage detection circuit 31 connected to the high voltage dc circuit 1 for detecting a dc bus voltage, denoted as dc voltage V dc 。
The dc voltage detection circuit 31 is connected to the controller 5 and detects the dc voltage V dc To the controller 5. The controller 5 is configured with a power-down slope limit, a normal voltage. The controller 5 receives the DC voltage V dc Calculating the power down slope, and comparing the power down slope with the power down slope limit value and the direct current voltage V dc And normal voltage; when the power-down slope is larger than the power-down slope limit value and the direct current voltage V dc And when the voltage is smaller than the normal voltage, controlling the direct current fan 4 to perform down-conversion operation.
The embodiment is under the direct current voltage V dc Controlling the direct current fan 4 to run in a down-conversion mode when abnormality occurs, reducing the energy consumption of the direct current fan 4 and controlling the direct current windThe machine 4 is shut down in preparation for operation.
In some embodiments, referring to fig. 3 and 4, the controller 5 controls the down-converting speed and the dc voltage V when the dc fan 4 is down-converting dc Is directly proportional or positively correlated.
In some embodiments, referring to fig. 1, 3 and 4, the controller 5 is configured with an under-voltage limit and is configured to compare the received dc voltage V dc And an under-voltage limit.
When the direct current voltage V dc When the voltage is smaller than the undervoltage limit value, the controller 5 judges that the power is off, and then the direct-current fan 4 and the low-voltage load 6 are controlled to stop running, and the electronic expansion valve 7 is controlled to be closed.
In an embodiment, referring to fig. 6, 7 and 8, the electrical signal detection circuit includes an ac detection circuit 32, which is connected to the controller 5 and the hvdc circuit 1, for detecting an electrical signal of the supplied ac power connected to the hvdc circuit 1.
The ac detection circuit 32 transmits the detected electric signal to the controller 5; the controller 5 determines whether to power off or not based on the received electric signal.
When the power is judged to be off, the direct current fan 4 and the low-voltage load 6 are controlled to stop running, and the electronic expansion valve 7 is controlled to be closed.
The indoor unit of the air conditioner of the embodiment detects the power supply condition of the power supply alternating current through the alternating current detection circuit 32; when the power supply alternating current is abnormal, the controller 5 judges that the power is off through the abnormality of the electric signal, and then controls the direct current fan 4 and the low-voltage load 6 to stop running, and controls the electronic expansion valve 7 to be closed, so that the judging time is shortened, the control efficiency is improved, and the reliability of closing control of the electronic expansion valve 7 is improved.
In an embodiment, the ac detection circuit may be a zero crossing detection circuit or an ac voltage detection circuit.
In some embodiments, referring to fig. 1, 6 and 9, the air conditioner indoor unit further includes a communication module 8 connected to the controller 5 for communicating with the outdoor unit.
When the controller 5 judges that the power is off, firstly, the direct current fan 4 is controlled to stop running, and the low-voltage load 6 is controlled to stop running; then the control communication module 8 sends a power-off signal; when the outdoor unit receives the power-off signal, the compressor is controlled to stop running.
After the controller 5 finishes sending the power-off signal, the communication module 8 is controlled to stop working, and then the electronic expansion valve 7 is controlled to be closed.
The indoor unit of the air conditioner in this embodiment sends a power-off signal to the outdoor unit when power is off, and is used to control the outdoor compressor to stop running, and reduce the refrigerant pressure before closing the electronic expansion valve 7, so as to prevent damage to the electronic expansion valve 7 and the refrigerant pipeline.
In one embodiment, referring to fig. 1, 6 and 9, the indoor unit of the air conditioner further includes a communication module 8; when the controller 5 judges that the power is off, the control communication module 8 sends a power-off signal; when the outdoor unit receives the power-off signal, the compressor is controlled to stop running.
After the controller 5 finishes sending the power-off signal, the direct-current fan 4 is controlled to stop running, the low-voltage load 6 is controlled to stop running, and then the electronic expansion valve 7 is controlled to be closed.
The indoor unit of the air conditioner of the embodiment firstly controls the compressor to stop running, controls the pressure and circulation of the refrigerant in the system, then controls the direct current fan 4 and the low-pressure load 6 to stop running, and finally controls the electronic expansion valve 7 to be closed. Firstly, controlling the compressor to stop running, slowing down the circulation speed of the refrigerant, and reducing the problem of rapid reduction of the temperature of the indoor evaporator caused by the stop running of the direct current fan 4 when power is off; and the electronic expansion valve 7 is closed, so that the problems of condensation of the indoor evaporator and liquid impact of the compressor are further solved, the user experience is improved, the service life of the compressor is prolonged, and the cost is saved.
In some embodiments, the low voltage load 6 with reference to fig. 1, 6, and 9 may be one or any number of relays, inputs, displays, line controllers, network communication devices, and the like.
In some embodiments, referring to fig. 6, 7, 8 and 9, the indoor unit of the air conditioner further includes a power-down memory 40, which is connected to the controller 5 and used for storing the operation settings of the indoor unit of the air conditioner when the controller 5 determines that the power is off, and may include the setting states of the dc fan 4, the low-voltage load 6 and the electronic expansion valve 7 before the power is off.
When the electric signal or the direct current voltage V dc When the operation is resumed for a predetermined period of time within a short period of time, the controller 5 controls the dc fan 4, the low-voltage load 6, and the electronic expansion valve 7 to gradually resume the operation state before the power failure according to the operation setting of the air conditioning indoor unit stored in the power failure memory 40.
The air conditioner indoor unit can automatically recover the running state before power failure when short-time power failure is performed, manual recovery of a user is not needed, and user experience is improved.
In one embodiment, the power down memory 40 is an EEPROM.
In some embodiments, referring to fig. 1, 6 and 9, the indoor unit of the air conditioner further includes a frequency converter 9, which is respectively connected to the dc bus electrolytic capacitor C1 of the high-voltage dc circuit 1, the dc fan 4, and the controller 5 controls the connection or disconnection of each path of the frequency converter 9, so as to change the direction and frequency of the power supplied to the dc fan 4 by the high-voltage dc circuit 1, and enable the dc fan 4 to start, boost, reduce or stop running.
When the controller 5 controls the inverter 9 to operate to stop the operation of the dc fan 4, the controller 5 controls each path of the inverter 9 to operate, so that the counter electromotive force generated by the dc fan 4 in the process of stopping rotation charges the high-voltage dc circuit 1.
The indoor unit of the air conditioner charges the high-voltage direct current circuit 1 through the back electromotive force generated in the stalling process of the direct current fan 4, so that the time of the high-voltage direct current circuit 1 for supplying power to the controller 5 and the electronic expansion valve 7 after power failure is prolonged, and the execution reliability of the power failure control logic of the controller 5 is improved.
In some embodiments, referring to fig. 9, the indoor unit of the air conditioner further includes a current detection circuit 30, which is respectively connected to the controller 5, the frequency converter 9, and the dc bus electrolytic capacitor C1, and is located between the dc bus electrolytic capacitor C1 and the frequency converter 9, and is used for measuring the current between the dc bus electrolytic capacitor C1 and the frequency converter 9 and transmitting the current to the controller 5.
The controller 5 is configured with a voltage predetermined value and a current predetermined value; the controller 5 controls the duty ratio of the passage of the frequency converter 9 according to the rotation speed of the DC fan 4 so that the voltage of the DC bus electrolytic capacitor C1 does not exceed a voltage preset value and the charging current does not exceed a current preset value.
In the embodiment, the power supply time of the high-voltage direct-current circuit 1 to the controller 5 is prolonged, the direct-current bus electrolytic capacitor C1 is protected, and the reliability and the service life of the indoor unit of the air conditioner are improved.
In one embodiment, the control is configured with a low current threshold; when the voltage of the direct current bus electrolytic capacitor C1 is not increased any more or the current supplied by the counter electromotive force to the direct current bus electrolytic capacitor C1 is smaller than the current low threshold value, each path of the frequency converter 9 is controlled to be disconnected, the counter electromotive force is ended to charge the direct current bus electrolytic capacitor C1, and the reverse consumption of the electric energy of the high-voltage direct current circuit 1 is prevented.
In an embodiment, referring to fig. 10, each path of the lower bridge arm of the inverter 9 is controlled to be communicated, so that the dc bus electrolytic capacitor C1 is charged when the W-phase current is maximum; of course, the duty ratio of each path of the lower bridge arm of the inverter 9 is controlled, and the charging voltage and current are controlled.
In some embodiments, referring to fig. 1, 6 and 9, the indoor unit of the air conditioner further includes a frequency converter driving circuit 10 and an electronic expansion valve driving circuit 20; the frequency converter 9 is connected with the controller 5 through a frequency converter driving circuit 10 and is used for controlling the connection and disconnection of each path of the frequency converter 9 by the controller 5; the electronic expansion valve 7 is connected to the controller 5 through an electronic expansion valve driving circuit 20, and is used for controlling the opening degree change of the electronic expansion valve 7 by the controller 5.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. The indoor unit of the air conditioner is characterized by comprising a high-voltage direct current circuit, a low-voltage direct current circuit, an electric signal detection circuit, a direct current fan, an electronic expansion valve, a controller and at least one low-voltage load;
the high-voltage direct current circuit is respectively connected with the low-voltage direct current circuit, the electric signal detection circuit and the direct current fan; the controller is respectively connected with the direct current fan, the low-voltage direct current circuit, the electronic expansion valve and the low-voltage load and respectively controls the power supply and the operation of the direct current fan, the electronic expansion valve and the low-voltage load;
the electric signal detection circuit comprises a direct-current voltage detection circuit, which detects the voltage of the high-voltage direct-current circuit, marks the voltage as direct-current voltage and transmits the direct-current voltage to the controller;
the controller is configured with a power-down slope limit value and a normal voltage; the controller calculates a power-down slope according to the direct-current voltage, and compares the power-down slope with the power-down slope limit value, the direct-current voltage and the normal voltage;
when the power-down slope is larger than the power-down slope limit value and the direct-current voltage is smaller than the normal voltage, controlling the direct-current fan to run in a down-conversion mode;
when the direct current fan is in down-conversion operation, the down-conversion rate of the direct current fan is positively correlated with the power-down slope;
the controller is configured with an undervoltage limit value and judges whether to power off according to the direct current voltage and the undervoltage limit value; when the direct current voltage is smaller than the undervoltage limit value, the controller judges that power is off; and when the controller judges that the power is off, controlling the direct current fan and the low-voltage load to stop running, and controlling the electronic expansion valve to be closed.
2. The indoor unit of claim 1, wherein the electrical signal detection circuit further comprises an ac detection circuit connected to the controller and the hvdc circuit for detecting an electrical signal of the ac power supply connected to the hvdc circuit;
the alternating current detection circuit sends the electric signal to the controller; the controller judges whether power is off or not according to the electric signal;
and when the controller judges that the power is off, the direct current fan and the low-voltage load are controlled to stop running, and the electronic expansion valve is controlled to be closed.
3. The indoor unit of claim 1 or 2, further comprising a communication module connected to the controller for communication with an outdoor unit;
when the controller judges that the power is off, the communication module is controlled to send a power-off signal for the outdoor unit to control the compressor to stop running;
and the controller controls the communication module to stop working after finishing the power-off signal transmission.
4. The indoor unit of claim 1 or 2, further comprising a power-down memory connected to the controller;
when the controller judges that the power is off, the power-off storage is controlled to store the set states of the direct-current fan, the electronic expansion valve and the low-voltage load before the power is off;
and when the electric signal or the direct current voltage is recovered to be normal in a short time and kept for a prescribed time, the controller controls the direct current fan, the electronic expansion valve and the low-voltage load to recover to the set state operation before power failure.
5. The indoor unit of claim 1 or 2, further comprising a frequency converter connected to the high-voltage dc circuit, the dc fan, and the controller, respectively;
the controller controls the connection or disconnection of each path of the frequency converter, and changes the connection state of the high-voltage direct-current circuit and the direct-current fan;
when the controller judges that the power is off, the controller controls the connection or disconnection of each path of the frequency converter, so that the direct current fan stops running, and the counter electromotive force of the direct current fan charges the high-voltage direct current circuit.
6. The indoor unit of claim 5, further comprising a current detection circuit; the high-voltage direct-current circuit comprises a direct-current bus electrolytic capacitor which is connected with the frequency converter;
the current detection circuit is respectively connected with the controller, the frequency converter and the direct current bus electrolytic capacitor and is used for detecting the current between the frequency converter and the direct current bus electrolytic capacitor and transmitting the current to the controller;
the controller is configured with a voltage predetermined value and a current predetermined value; when the direct current fan stops running, the controller controls the duty ratio of the passage of the frequency converter according to the rotating speed of the direct current fan, so that the voltage of the direct current bus electrolytic capacitor does not exceed the voltage preset value and the charging current does not exceed the current preset value.
7. The indoor unit of claim 6, wherein the controller is configured with a low current threshold and compares the current between the inverter and the dc bus electrolytic capacitor to the low current threshold;
and when the voltage of the direct current bus electrolytic capacitor is not increased any more or the current supplied to the direct current bus electrolytic capacitor by the back electromotive force is smaller than the current low threshold value, the controller controls the switching-off of the passage of the frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234220.7A CN113883703B (en) | 2021-10-22 | 2021-10-22 | Indoor unit of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234220.7A CN113883703B (en) | 2021-10-22 | 2021-10-22 | Indoor unit of air conditioner |
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| CN113883703A CN113883703A (en) | 2022-01-04 |
| CN113883703B true CN113883703B (en) | 2023-06-23 |
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| CN202111234220.7A Active CN113883703B (en) | 2021-10-22 | 2021-10-22 | Indoor unit of air conditioner |
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| CN115371202A (en) * | 2022-08-29 | 2022-11-22 | 四川虹美智能科技有限公司 | Intelligent air conditioner abnormal power-off resetting device and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7424343B2 (en) * | 2004-08-11 | 2008-09-09 | Lawrence Kates | Method and apparatus for load reduction in an electric power system |
| CN101282090A (en) * | 2007-04-04 | 2008-10-08 | 张亦翔 | Capacitance partial pressure DC voltage stabilizing power source |
| JP5640936B2 (en) * | 2011-09-14 | 2014-12-17 | 株式会社デンソー | Air conditioner for vehicles |
| CN103292448A (en) * | 2013-05-30 | 2013-09-11 | 华为技术有限公司 | Method and device for preventing condensation of refrigerating device |
| CN108109568A (en) * | 2018-01-10 | 2018-06-01 | 京东方科技集团股份有限公司 | Power supply adjusting circuit and method, test system |
| CN110094857B (en) * | 2019-04-11 | 2021-03-12 | 海信（山东）空调有限公司 | Control method and device of air conditioner electronic expansion valve, computer product and air conditioner |
| CN110094861A (en) * | 2019-06-04 | 2019-08-06 | 珠海格力电器股份有限公司 | Refrigeration system |
| KR20210101946A (en) * | 2020-02-11 | 2021-08-19 | 엘지전자 주식회사 | Power converting apparatus and air conditioner including the same |
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