CN113531790A - Communication control circuit, multi-connected air conditioner and control method - Google Patents
Communication control circuit, multi-connected air conditioner and control method Download PDFInfo
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- CN113531790A CN113531790A CN202110642510.9A CN202110642510A CN113531790A CN 113531790 A CN113531790 A CN 113531790A CN 202110642510 A CN202110642510 A CN 202110642510A CN 113531790 A CN113531790 A CN 113531790A
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- 238000004891 communication Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000007791 dehumidification Methods 0.000 claims description 12
- 238000005057 refrigeration Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 9
- 230000001012 protector Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a communication control circuit, a multi-connected air conditioner and a control method, wherein the circuit is applied to the multi-connected air conditioner comprising an outdoor unit and a plurality of indoor units, each indoor unit comprises a first port connected with a main power supply loop, and a second port and a third port connected with a standby power supply loop, and the circuit comprises: the communication maintaining unit is used for supplying power to the second port and the third port based on the standby power supply loop when the main power supply loop is disconnected, and disconnecting the standby power supply loop when the main power supply loop is not disconnected; a main power supply unit for supplying power to the first port based on the main power supply loop; the first port is a power supply port of the indoor unit, and the second port and the third port are power supply ports of a main control panel of the indoor unit, so that the power-off indoor unit can keep communication with an outdoor unit, and the reliability of the air conditioner is improved.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a communication control circuit, a multi-connected air conditioner and a control method.
Background
Air conditioners are used in various applications, such as in the home, in vehicles, and in work environments, to greatly improve the comfort of people. The multi-split air conditioner (i.e. the multi-split air conditioner) is popular for people because one outdoor unit can be matched with a plurality of indoor units at the same time, and the application form is more diversified.
In the multi-split air-conditioning system, if a certain part of a substrate (namely a main control panel) of one indoor unit is damaged to cause the substrate to be powered off or a certain indoor unit is powered off suddenly when each indoor unit is powered on respectively, an electronic expansion valve inside the indoor unit can be kept in a state before the power failure because the power supply is lost, namely the electronic expansion valve has a certain opening degree, so that a refrigerant flows into the indoor unit with the power failure, and other indoor units which normally run lack the refrigerant. And water drops can be generated on the metal plate of the indoor unit or other positions due to the inflow of the low-temperature refrigerant during the refrigeration. At present, if the situation happens, the general mode in the industry is to power down the whole system to prevent other indoor units from abnormal operation.
Therefore, how to provide a communication control circuit that enables the powered off indoor unit to maintain communication with the outdoor unit in the multi-split air conditioner, thereby improving the reliability of the air conditioner is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a communication control circuit, which is used for solving the technical problem of low reliability of an air conditioner caused by the fact that an indoor unit cannot communicate with an outdoor unit after power failure in a multi-connected air conditioner in the prior art.
The communication control circuit is applied to a multi-connected air conditioner comprising an outdoor unit and a plurality of indoor units, wherein each indoor unit comprises a first port connected with a main power supply loop, and a second port and a third port connected with a standby power supply loop, and the circuit comprises:
the communication maintaining unit is used for supplying power to the second port and the third port based on the standby power supply loop when the main power supply loop is disconnected, and disconnecting the standby power supply loop when the main power supply loop is not disconnected;
a main power supply unit for supplying power to the first port based on the main power supply loop;
the first port is a power supply port of the indoor unit, and the second port and the third port are power supply ports of a main control board of the indoor unit.
In some embodiments of the present application, the communication maintaining unit includes:
the first power supply port is used for connecting a first alternating current power supply;
the relay is closed when the main power supply loop is disconnected and is disconnected when the main power supply loop is not disconnected, and is used for controlling the on-off of the standby power supply loop;
an output unit for supplying power to the second port and the third port when the relay is engaged.
In some embodiments of the present application, the output unit includes:
the switching power supply is connected with the first power supply port and the switch of the relay and used for converting the first alternating current power supply into a first direct current power supply and a second direct current power supply;
the first power supply port is connected with the first output end of the switching power supply and used for inputting the first direct-current power supply into the second port;
and the second power supply port is connected with the second output end of the switching power supply and is used for inputting the second direct-current power supply into the third port.
In some embodiments of the present application, the main power supply unit includes:
the main power supply port is used for connecting a second alternating current power supply;
and the input end of the leakage protector is connected with the main power supply port, and the output end of the leakage protector is connected with the first port and the coil of the relay and is used for controlling the on-off of the main power supply loop.
In some embodiments of the present application, the first ac power source is an ac 24V power source, the second ac power source is an ac 220V power source, the first dc power source is a dc 12V power source, and the second dc power source is a dc 5V power source.
Through applying above technical scheme, in the multi-connected air conditioner that includes off-premises station and a plurality of indoor units, the indoor unit includes the first port of connecting main power supply circuit and the second port and the third port of connecting reserve power supply circuit, and communication control circuit includes: the communication maintaining unit is used for supplying power to the second port and the third port based on the standby power supply loop when the main power supply loop is disconnected, and disconnecting the standby power supply loop when the main power supply loop is not disconnected; a main power supply unit for supplying power to the first port based on the main power supply loop; the first port is a power supply port of the indoor unit, and the second port and the third port are power supply ports of a main control panel of the indoor unit, so that the power-off indoor unit can keep communication with an outdoor unit, and the reliability of the air conditioner is improved.
Correspondingly, the present invention further provides a multi-connected air conditioner, which includes an outdoor unit and a plurality of indoor units, wherein the multi-connected air conditioner includes the communication control circuit as described above, and further includes:
a plurality of expansion valves which are provided in one-to-one correspondence with the indoor units, and expand the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant;
a controller configured to:
when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining the operation mode of the target indoor unit before the power failure;
and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
In some embodiments of the present application, the operation modes include a cooling mode, a dehumidification mode, and a heating mode, and the controller is configured to:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
Correspondingly, the present invention further provides a control method for a multi-connected air conditioner, which is applied to a multi-connected air conditioner comprising an outdoor unit and a plurality of indoor units, wherein the multi-connected air conditioner comprises the communication control circuit, a controller and a plurality of expansion valves arranged in one-to-one correspondence with the indoor units, and the method applied to the controller comprises:
when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining the operation mode of the target indoor unit before the power failure;
and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
In some embodiments of the present application, the operation modes include a cooling mode, a dehumidification mode, and a heating mode, and the controlling a target expansion valve corresponding to the target indoor unit according to the operation modes specifically includes:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
By applying the technical scheme, the multi-connected air conditioner comprises the communication control circuit, the controller and a plurality of expansion valves which are arranged in one-to-one correspondence with the indoor units, and when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, the operation mode of the target indoor unit before power failure is determined; and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode, so that the corresponding expansion valve can be still controlled after the indoor unit is powered off, and the reliability of the air conditioner is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a communication control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a communication control circuit according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of a multi-connected air conditioner according to an embodiment of the present invention.
In fig. 1 and 2, 1, a first power supply port, 2, a main power supply port, 3, a leakage protector, 4, a relay, 5, a switching power supply, 6, a first power supply port, 7, a second power supply port, 8, an indoor unit, 9, a first port, 10, a second port, 11, and a third port.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The multi-connected air conditioner in the present application performs a refrigeration cycle by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas, the discharged refrigerant gas flows into a condenser, the condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through a condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
The embodiment of the present application provides a communication control circuit, which is applied to a multi-connected air conditioner including an outdoor unit and a plurality of indoor units, as shown in fig. 1, each indoor unit 8 includes a first port 9 connected to a main power supply circuit, and a second port 10 and a third port 11 connected to a standby power supply circuit, and the circuit includes:
a communication maintaining unit, configured to supply power to the second port 10 and the third port 11 based on the standby power supply loop when the main power supply loop is disconnected, and disconnect the standby power supply loop when the main power supply loop is not disconnected;
a main power supply unit for supplying power to the first port 9 based on the main power supply circuit;
the first port 9 is a power supply port of the indoor unit 8, and the second port 10 and the third port 11 are power supply ports of a main control board of the indoor unit 8.
In this embodiment, the power supply port of the indoor unit 8 is a first port 9, the power supply ports of the main control board of the indoor unit 8 are a second port 10 and a third port 11, the main power supply loop supplies power to the first port 9 of the indoor unit 8, and the standby power supply loop supplies power to the second port 10 and the third port 11 of the indoor unit 8.
When the indoor unit 8 operates normally, the power is received through a main power supply loop of the main power supply unit, and at the moment, a main control board of the indoor unit 8 is powered by a direct-current power supply converted through the first port 9; when the main power supply loop is disconnected, the standby power supply loop is conducted through the communication maintaining unit to supply power to the second port 10 and the third port 11, namely, the main control panel is supplied with power, so that the communication between the main control panel and the outdoor unit can be maintained after the indoor unit 8 is powered off; when the main power supply loop is not disconnected, the standby power supply loop is disconnected through the communication maintaining unit in order to avoid influencing the normal operation of the indoor unit 8.
In order to improve the reliability of the communication maintaining unit, in some embodiments of the present application, as shown in fig. 1, the communication maintaining unit includes:
a first power supply port 1 for connecting a first alternating current power supply;
the relay 4 is attracted when the main power supply loop is disconnected and disconnected when the main power supply loop is not disconnected, and is used for controlling the on-off of the standby power supply loop;
an output unit for supplying power to the second port 10 and the third port 11 when the relay 4 is engaged.
In order to ensure the reliability of the output unit, in some embodiments of the present application, as shown in fig. 1, the output unit includes:
a switching power supply 5 connected to the first power supply port 1 and the switch of the relay 4, for converting the first ac power supply into a first dc power supply and a second dc power supply;
a first power supply port 6 connected to a first output terminal of the switching power supply 5, for inputting the first direct current power supply to the second port 10;
and the second power supply port 7 is connected with a second output end of the switching power supply 5 and used for inputting the second direct-current power supply into the third port 11.
In order to ensure the reliability of the main power supply unit, in some embodiments of the present application, as shown in fig. 1, the main power supply unit includes:
a main power supply port 2 for connecting a second ac power supply;
and the input end of the leakage protector 3 is connected with the main power supply port 2, and the output end of the leakage protector is connected with the first port 9 and a coil of the relay 4, and is used for controlling the on-off of the main power supply loop. .
In order to ensure the reliability of the indoor unit, in some embodiments of the present application, the first ac power supply is an ac 24V power supply, the second ac power supply is an ac 220V power supply, the first dc power supply is a dc 12V power supply, and the second dc power supply is a dc 5V power supply.
Because the first port 9 is connected with an alternating current 220V power supply, the power supply can not be directly supplied to the main control board, the first port 9 is also connected with a power supply conversion device, and the power supply conversion device converts a second alternating current power supply into a direct current power supply matched with the main control board and then supplies power to the main control board.
The specific structure of the power conversion device will be apparent to those skilled in the art, and will not be described herein.
As shown in fig. 1, when the indoor unit 8 is normally powered, i.e., the main power supply circuit is not disconnected, the backup power supply circuit (broken line portion in the figure) is disconnected.
As shown in fig. 2, when the indoor unit 8 is powered off, that is, when the main power supply circuit (broken line portion in the figure) is disconnected, the second port 10 and the third port 11 are supplied with power through the backup power supply circuit.
Through applying above technical scheme, in the multi-connected air conditioner that includes off-premises station and a plurality of indoor units, the indoor unit includes the first port of connecting main power supply circuit and the second port and the third port of connecting reserve power supply circuit, and communication control circuit includes: the communication maintaining unit is used for supplying power to the second port and the third port based on the standby power supply loop when the main power supply loop is disconnected, and disconnecting the standby power supply loop when the main power supply loop is not disconnected; a main power supply unit for supplying power to the first port based on the main power supply loop; the first port is a power supply port of the indoor unit, and the second port and the third port are power supply ports of a main control panel of the indoor unit, so that the power-off indoor unit can keep communication with an outdoor unit, and the reliability of the air conditioner is improved.
Corresponding to the communication control circuit in the embodiment of the present application, an embodiment of the present application further provides a multi-connected air conditioner, where the multi-connected air conditioner includes the communication control circuit as described above, and further includes:
a plurality of expansion valves which are provided in one-to-one correspondence with the indoor units, and expand the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant;
a controller configured to:
when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining the operation mode of the target indoor unit before the power failure;
and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
In this embodiment, the controller may be an outdoor unit controller, and when it is detected that there is a target indoor unit with a power failure and the main control board of the target indoor unit is powered by the standby power supply loop, the controller may continue to communicate with the target indoor unit to determine an operation mode of the target indoor unit before the power failure, at this time, because the target indoor unit is powered off, the target expansion valve of the target indoor unit maintains an opening degree before the power failure, and the target expansion valve may be controlled according to the operation mode.
For reliable control of a target expansion valve, in some embodiments of the present application, the operation modes include a cooling mode, a dehumidification mode, and a heating mode, and the controller is configured to:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
In this embodiment, if the operation mode is the cooling mode or the dehumidification mode, the target expansion valve is closed, and thus, the problems of condensation of the pipes and the metal plates, and the like, caused by the refrigerant at a lower temperature flowing through the heat exchanger of the target indoor unit (at this time, the heat exchanger of the target indoor unit is an evaporator) are prevented.
If the operation mode is a heating mode, the target expansion valve is turned down to a preset opening degree, so that the heat exchanger of the target indoor unit (the heat exchanger of the target indoor unit is a condenser) is prevented from being overheated, and the phenomenon that the heat exchanger of the target indoor unit stores a large amount of refrigerant to cause that other indoor units lack the refrigerant is avoided.
Corresponding to the multiple air conditioner in the embodiment of the present application, the embodiment of the present application further provides a control method of a multiple air conditioner, which is applied to a multiple air conditioner including an outdoor unit and a plurality of indoor units, where the multiple air conditioner includes the communication control circuit as described above, a controller and a plurality of expansion valves arranged in one-to-one correspondence with the indoor units, and the method is applied to the controller, and as shown in fig. 3, includes the following steps:
step S101, when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining an operation mode of the target indoor unit before the power failure;
and step S102, controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
In order to reliably control a target expansion valve, in some embodiments of the present application, the operation modes include a cooling mode, a dehumidification mode, and a heating mode, and the controlling of the target expansion valve corresponding to the target indoor unit according to the operation modes specifically includes:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A communication control circuit is applied to a multi-connected air conditioner comprising an outdoor unit and a plurality of indoor units, and is characterized in that each indoor unit comprises a first port connected with a main power supply loop, and a second port and a third port connected with a standby power supply loop, and the circuit comprises:
the communication maintaining unit is used for supplying power to the second port and the third port based on the standby power supply loop when the main power supply loop is disconnected, and disconnecting the standby power supply loop when the main power supply loop is not disconnected;
a main power supply unit for supplying power to the first port based on the main power supply loop;
the first port is a power supply port of the indoor unit, and the second port and the third port are power supply ports of a main control board of the indoor unit.
2. The circuit of claim 1, wherein the communication maintaining unit comprises:
the first power supply port is used for connecting a first alternating current power supply;
the relay is closed when the main power supply loop is disconnected and is disconnected when the main power supply loop is not disconnected, and is used for controlling the on-off of the standby power supply loop;
an output unit for supplying power to the second port and the third port when the relay is engaged.
3. The circuit of claim 2, wherein the output unit comprises:
the switching power supply is connected with the first power supply port and the switch of the relay and used for converting the first alternating current power supply into a first direct current power supply and a second direct current power supply;
the first power supply port is connected with the first output end of the switching power supply and used for inputting the first direct-current power supply into the second port;
and the second power supply port is connected with the second output end of the switching power supply and is used for inputting the second direct-current power supply into the third port.
4. The circuit of claim 3, wherein the main power supply unit comprises:
the main power supply port is used for connecting a second alternating current power supply;
and the input end of the leakage protector is connected with the main power supply port, and the output end of the leakage protector is connected with the first port and the coil of the relay and is used for controlling the on-off of the main power supply loop.
5. The circuit of claim 4, wherein the first AC power source is an AC 24V power source, the second AC power source is an AC 220V power source, the first DC power source is a DC 12V power source, and the second DC power source is a DC 5V power source.
6. A multi-connected air conditioner comprising an outdoor unit and a plurality of indoor units, wherein the multi-connected air conditioner comprises the communication control circuit according to any one of claims 1 to 5, and further comprising:
a plurality of expansion valves which are provided in one-to-one correspondence with the indoor units, and expand the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant;
a controller configured to:
when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining the operation mode of the target indoor unit before the power failure;
and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
7. The multi-connected air conditioner according to claim 6, wherein the operation modes include a cooling mode, a dehumidifying mode and a heating mode, and the controller is configured to:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
8. A control method of a multi-connected air conditioner applied to a multi-connected air conditioner including an outdoor unit and a plurality of indoor units, wherein the multi-connected air conditioner includes the communication control circuit according to any one of claims 1 to 5, and a controller and a plurality of expansion valves provided in one-to-one correspondence with the respective indoor units, the method applied to the controller, comprising:
when a target indoor unit with power failure is detected and the main control board of the target indoor unit is powered by the standby power supply loop, determining the operation mode of the target indoor unit before the power failure;
and controlling a target expansion valve corresponding to the target indoor unit according to the operation mode.
9. The method of claim 8, wherein the operation modes include a cooling mode, a dehumidification mode, and a heating mode, and the controlling of the target expansion valve corresponding to the target indoor unit according to the operation modes includes:
if the operation mode is the refrigeration mode or the dehumidification mode, closing the target expansion valve;
and if the operation mode is the heating mode, closing the target expansion valve to a preset opening degree.
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