CN114826314A - Communication circuit, control method and device thereof and electronic equipment - Google Patents
Communication circuit, control method and device thereof and electronic equipment Download PDFInfo
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- CN114826314A CN114826314A CN202210239222.3A CN202210239222A CN114826314A CN 114826314 A CN114826314 A CN 114826314A CN 202210239222 A CN202210239222 A CN 202210239222A CN 114826314 A CN114826314 A CN 114826314A
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- 238000004891 communication Methods 0.000 title claims abstract description 193
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- 230000003287 optical effect Effects 0.000 claims abstract description 67
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 230000015654 memory Effects 0.000 claims description 19
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- 238000004590 computer program Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 16
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—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
- F24F11/88—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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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Abstract
The application relates to a communication circuit, a control method and a control device thereof, and electronic equipment, wherein the communication circuit comprises: the first circuit is positioned in the air conditioner external machine and is connected to a live wire port and a zero line port of a power supply; the second circuit is positioned in the air conditioner and is connected to a live wire port and a zero line port of the power supply; the temperature measuring circuit is used for measuring the ambient temperature of the air conditioner external unit; and the resistance variable circuit is positioned on a communication line between the first circuit and the second circuit and used for changing the resistance value of the communication circuit by adjusting the working resistance value of the resistance variable circuit according to the environment temperature so as to adjust loop current, wherein the loop current is the working current of the optical coupler device, the optical coupler device is used for realizing isolation protection when communication is carried out between an air conditioner internal unit and an air conditioner external unit, and the resistance variable circuit is electrically connected with the temperature measuring circuit. The technical problem that communication faults of the communication circuit are caused by reduction of the current transmission ratio of the optical coupler due to temperature rise is solved.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a communication circuit, a control method and a control device of the communication circuit and electronic equipment.
Background
Most of the air conditioners today are composed of an indoor unit and an outdoor unit. The indoor unit and the outdoor unit need to communicate with each other to realize complex functions. For example, the inverter air conditioner needs to change the operating frequency of the compressor of the outdoor unit according to different operating conditions, which requires frequent communication between the indoor unit and the outdoor unit. In a communication Current loop, a photocoupler is usually adopted to achieve the purpose of isolation protection, and the CTR (Current transfer ratio) of the photocoupler is an important parameter of the photocoupler, that is, the minimum value of the ratio of the output Current (IC) of the secondary side of the photocoupler to the input Current (IF) of the primary side of the photocoupler. Generally, the CTR value of the optical coupler can be gradually attenuated along with the use duration and the temperature rise, and the reduction of the CTR value can cause the failure of the function of the optical coupler in a circuit, so that the communication fault of an air conditioner indoor unit and an air conditioner outdoor unit is caused.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The application provides a communication circuit, a control method and a control device of the communication circuit and electronic equipment, and aims to at least solve the technical problem that communication faults of the communication circuit are caused by reduction of current transmission ratio of an optical coupler due to temperature rise in the related art.
According to an aspect of the embodiments of the present application, there is also provided a communication circuit, including: the first circuit is positioned in the air conditioner external machine and is connected to a live wire port and a zero line port of a power supply; the second circuit is positioned in the air conditioner and is connected to a fire wire port and a zero line port of the power supply; the temperature measuring circuit is used for measuring the ambient temperature of the air conditioner external unit; the resistance variable circuit is positioned on a communication line between the first circuit and the second circuit and used for changing the resistance value of the communication circuit according to the ambient temperature by adjusting the working resistance value of the resistance variable circuit so as to adjust the loop current, wherein the loop current is the working current of the optical coupler device, the optical coupler device is used for realizing isolation protection when communication is carried out between an air conditioner internal unit and an air conditioner external unit, and the resistance variable circuit is electrically connected with the temperature measuring circuit.
According to another aspect of the embodiments of the present application, there is provided a communication circuit control method, including: acquiring an ambient temperature, wherein the ambient temperature is the temperature of the environment where an air conditioner external unit is located; according to the environment temperature, the loop current passing through the communication line is adjusted by adjusting the working resistance value of the resistance variable circuit on the communication line, wherein the loop current is the working current of the optical coupler device, and the optical coupler device is used for realizing isolation protection when communication is carried out between the air conditioner internal unit and the air conditioner external unit.
According to another aspect of the embodiments of the present application, there is also provided a communication circuit control apparatus, including: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the ambient temperature, and the ambient temperature is the temperature of the environment where the air conditioner external unit is located; and the adjusting module is used for adjusting the loop current passing through the communication line by adjusting the working resistance value of the resistance variable circuit on the communication line according to the ambient temperature, wherein the loop current is the working current of the optical coupler device, and the optical coupler device is used for realizing isolation protection when communication is carried out between the air conditioner internal unit and the air conditioner external unit.
According to another aspect of the embodiments of the present application, there is also provided a storage medium including a stored program which, when executed, performs the above-described method.
According to another aspect of the embodiments of the present application, there is also provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the above method through the computer program.
According to an aspect of the application, a computer program product or computer program is provided, comprising computer instructions, the computer instructions being stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the steps of any of the embodiments of the method described above.
In the embodiment of the application, the ambient temperature is obtained, wherein the ambient temperature is the temperature of the environment where the air conditioner external unit is located; according to the ambient temperature, through the work resistance value of adjusting the variable circuit of resistance on the communication line, adjust the loop current through the communication line, wherein, the loop current is the operating current of opto-coupler device, the opto-coupler device is used for realizing isolation protection when carrying out the communication between air conditioner internal unit and air conditioner outer machine, through the resistance value in the communication circuit that changes according to ambient temperature, with the electric current size in the communication loop of adjusting opto-coupler device place, reached and adjusted the electric current with the purpose of maintaining normal communication along with the temperature change, the technical problem of communication circuit communication trouble because the temperature risees and leads to the reduction of the current transmission ratio of opto-coupler has been solved, thereby realized the technological effect who improves communication stability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a diagram illustrating a hardware environment of a method for controlling a communication circuit according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of an alternative communication circuit control method according to an embodiment of the present application;
FIG. 3 is an alternative graph of optocoupler temperature versus CTR in accordance with an embodiment of the present application;
FIG. 4 is an alternative optocoupler input current to CTR graph in accordance with embodiments of the present application;
FIG. 5 is a graph of an alternative optocoupler usage duration versus CTR according to an embodiment of the application;
fig. 6 is a schematic diagram of an alternative air conditioner internal and external unit three-wire system zero-fire line communication according to an embodiment of the present application;
FIG. 7(a) is a schematic diagram of an alternative communication circuit according to an embodiment of the present application;
FIG. 7(b) is a schematic diagram of an alternative communication circuit module connection according to an embodiment of the present application;
FIG. 7(c) is a schematic diagram of yet another alternative communication circuit module connection according to an embodiment of the present application;
FIG. 7(d) is a schematic diagram of yet another alternative communication circuit module connection according to an embodiment of the present application;
FIG. 8 is a schematic diagram of an alternative communication circuit control apparatus according to an embodiment of the present application; and the number of the first and second groups,
fig. 9 is a block diagram of a terminal according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, 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 partial embodiments of the present application, but not all 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.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
First, partial nouns or terms appearing in the description of the embodiments of the present application are applicable to the following explanations:
the optocoupler device, namely an Optocoupler (OP), is called an optocoupler for short, the optocoupler adopts a phototriode and a light emitting diode, and the output current of the optocoupler triode is controlled by controlling the intensity of light emitted by the diode through an input end, so that electrical isolation is realized.
CTR of the optocoupler (CTR, Current transfer ratio) CTR of the optocoupler is an important parameter of the optocoupler, i.e. the minimum value of the ratio of the output Current (IC) on the secondary side of the optocoupler to the input Current (IF) on the primary side of the optocoupler. The CTR range is as large as 20% to 300% (e.g., 4N35), while the PC817 series is 50% to 600%. Generally, the CTR value of the optical coupler can be gradually reduced along with the increase of the service life and the temperature, and the reduction of the CTR value can cause the failure of the function of the optical coupler in the circuit.
According to an aspect of the embodiments of the present application, an embodiment of a method for controlling a communication circuit is provided.
Alternatively, in the present embodiment, the communication circuit control method described above may be applied to a hardware environment constituted by the terminal 101 and the server 103 as shown in fig. 1. As shown in fig. 1, a server 103 is connected to a terminal 101 through a network, which may be used to provide communication circuit control services for the terminal or a client installed on the terminal, and a database 105 may be provided on the server or separately from the server, which may be used to provide data storage services for the server 103, and the network includes but is not limited to: the terminal 101 is not limited to a PC, an air conditioner, and the like. The communication circuit control method according to the embodiment of the present application may be executed by the server 103, the terminal 101, or both the server 103 and the terminal 101. The terminal 101 executing the communication circuit control method according to the embodiment of the present application may also be executed by a client installed thereon. A communication circuit control method according to an embodiment of the present application is performed on a terminal as an example.
Fig. 2 is a flowchart of an alternative communication circuit control method according to an embodiment of the present application, and as shown in fig. 2, the method may include the following steps:
step S202, acquiring an ambient temperature, wherein the ambient temperature is the temperature of the environment where the air conditioner external unit is located;
and S204, adjusting the loop current passing through the communication line by adjusting the working resistance value of the resistance variable circuit on the communication line according to the environment temperature, wherein the loop current is the working current of an optical coupler device, and the optical coupler device is used for realizing isolation protection when the communication is carried out between the air conditioner internal unit and the air conditioner external unit.
Through the steps S202 to S204, the current in the communication loop where the optocoupler is located is adjusted by changing the resistance value in the communication circuit according to the ambient temperature, so that the purpose of adjusting the current along with the temperature change to maintain normal communication is achieved, the technical problem of communication fault of the communication circuit caused by reduction of the current transmission ratio of the optocoupler due to temperature rise is solved, and the technical effect of improving the communication stability is achieved.
In the technical solution provided in step S202, the terminal obtains an ambient temperature, where the ambient temperature is a temperature of an environment where an external unit of the air conditioner is located.
Optionally, in this embodiment, the ambient temperature may be obtained by 3 ways including, but not limited to: (1) measuring the air temperature of the space where the air conditioner external unit is located by using a thermometer; (2) measuring the surface temperature of an air conditioner external unit by using an infrared thermometer; (3) and measuring the temperature of the optical coupling device in the air conditioner outdoor unit by using the temperature sensor.
In the technical scheme provided in step S204, the terminal adjusts a loop current passing through the communication line by adjusting a working resistance value of the resistance variable circuit on the communication line according to the ambient temperature, where the loop current is a working current of an optocoupler device, and the optocoupler device is used for implementing isolation protection when communication is performed between the air conditioner internal unit and the air conditioner external unit.
The CTRs (current transfer ratios) of the optocoupler devices are different at different environmental temperatures, as shown in fig. 3, the CTR of the optocoupler is continuously reduced with the continuous rise of the temperature, and I C For secondary side output current, I F Is a primary side input current, I C ＝I F X CTR, the CTR of the optocoupler continuously decreases to result in I C And are continuously reduced so that communication cannot be completed.
As shown in fig. 4, the input current I of the optocoupler F The relationship with CTR is shown as follows F The CTR gradually approaches the maximum value, but then the CTR value gradually decreases. Although the larger the input current of the optocoupler is, the larger the CTR is, in practical engineering application, on the high-voltage side (the power supply voltage in the communication current loop is generally larger than 50V, the current-limiting resistance is generally larger, and the power consumption is higher): the larger the input current is, the larger the power consumption is, the larger the calorific value of the current-limiting resistor is, and the higher the temperature of the resistor is, the larger the influence on the resistance value of the resistor is. And the higher the temperature, the stronger the dependence of the user on the air conditioner, the long-time high-temperature environment work of the resistor will accelerate the aging speed of the resistor, the resistance value will change and the service life of the resistor will be further reduced. And low-voltage side (the operating supply voltage of the low-voltage side is generally +5V or + 3.3V): despite the relatively large operating currents in the circuitHowever, since the voltage across each resistor is small, the power of the resistor is small, and the heat generation amount is smaller. The power supply voltage in the communication current loop is generally larger than 50V, and the partial voltage of an optical coupler and a diode in the communication loop is not higher than 5V when the optical coupler and the diode work. When the working current is 4mA, the power consumption of the resistor in the circuit is as high as 180 mW. The higher the power consumption, the greater the heating value of the resistor. And the working power supply voltage of the low-voltage side is generally +5V or +3.3V, and when the working current is 4mA, the maximum power consumption in the circuit is 20 mA. Thus, the operating current I in the communication current loop F It should not be too large.
As shown in FIG. 3, the input current I of the solid curve in FIG. 3 F Input current I less than the dotted curve F Although, the input current I F The large optical coupler CTR changes little with the temperature, but the working current in the communication current loop is not suitable to be overlarge, namely the input current I of the optical coupler F The value of (A) should not be too large.
Therefore, it is necessary to adjust the loop current of the communication circuit according to the temperature, rather than maintaining the loop current at a larger value, so as to reduce the power consumption of the communication circuit at a lower temperature. Because in the communication circuit of the air conditioner internal and external units, the temperature change of the environment where the air conditioner external unit is located is large, and the optical coupler in the circuit of the external unit is greatly influenced by the temperature, the temperature of the environment where the air conditioner external unit is located is used as a temperature data source in the scheme.
Alternatively, in this embodiment, the resistance value of the communication circuit may be changed in various ways, for example, by providing one or more variable resistors in the communication circuit.
As an alternative embodiment, the terminal adjusts the working resistance value of the resistance variable circuit according to the ambient temperature to adjust the loop current, wherein the resistance variable circuit is a circuit with an adjustable resistance value.
Optionally, the terminal determines a resistance range according to the ambient temperature, wherein the resistance range is used for adjusting the loop current to a range allowed by the optical coupler device when the optical coupler device normally works at the ambient temperature; and adjusting the working resistance value of the resistance variable circuit to be within the resistance value range.
For example, at a temperature of 50 degrees celsius, the CTR of the optocoupler is small, and the loop needs to be powered upFlow is increased to not less than I 0 And then, the optical coupler can be ensured to normally work, and the resistance value range of the working resistance value of the resistance variable circuit can be determined according to the loop current range allowed by the normal work of the optical coupler at the temperature of 50 ℃.
The resistance variable circuit can realize the change of the working resistance value in various ways, such as: (1) arranging a slide rheostat in the circuit to change the working resistance value of the slide rheostat; (2) a plurality of series resistors are arranged in the circuit, and the working resistance value is changed through the short-circuit part resistors; (3) a plurality of parallel resistors are arranged in the circuit, and the working resistance value is changed by changing the on-off of the branch where part of the resistors are located.
As an alternative embodiment, the resistance variable circuit includes a plurality of resistors connected in series, and the terminal controls each resistor in the resistance variable circuit as follows: obtaining a comparison result between the environment temperature and a temperature value associated with a target resistor, wherein the target resistor is any resistor in a resistor variable circuit, and each resistor in the resistor variable circuit is associated with a preset temperature value; and controlling the working state of the target resistor in the variable resistor circuit according to the comparison result so as to adjust the working resistance value of the variable resistor circuit, wherein the working state comprises a pass state and a short-circuit state.
Optionally, the resistance values of the plurality of resistors connected in series in the variable resistor circuit may be determined according to actual needs, and may be a plurality of resistors having the same resistance value or resistors having different resistance values, and the temperature value associated with each resistor is calibrated according to the actual condition of the circuit.
Optionally, in the process of temperature increase, the terminal short-circuits a first target resistor in the communication circuit when the ambient temperature exceeds a first preset temperature; and under the condition that the environmental temperature continues to rise to exceed a second preset temperature, a second target resistor in the communication circuit is short-circuited, wherein the second preset temperature is higher than the first preset temperature, and the first target resistor is also in a short-circuit state when the second target resistor is in the short-circuit state. For example, every 10 ℃ rise in ambient temperature, one more resistor in the resistance variable circuit is shorted.
Optionally, during the temperature drop: the terminal restores a second target resistor in the communication circuit to a path state under the condition that the ambient temperature is reduced to a second preset temperature; and under the condition that the ambient temperature is continuously reduced to a first preset temperature, restoring a first target resistor in the communication circuit to a path state, wherein a second target resistor is also in the path state when the first target resistor is in the path state. For example, every 10 ℃ decrease in the ambient temperature, one more resistor is restored to the short-circuited resistor in the resistance variable circuit.
Alternatively, the working state of each resistor can be switched by various technical means, for example, each resistor is connected with an electrically controlled switch in parallel, and the terminal outputs an electrical signal to each electrically controlled switch according to the ambient temperature, so that the resistor is switched to a pass state or a short-circuit state.
As an alternative embodiment, each resistor has a parallel relay, and the terminal closes the target relay to adjust the working state of the target resistor to a short-circuit state when the ambient temperature is greater than the temperature value associated with the target resistor, where the target relay is the relay to which the target resistor is connected in parallel; and under the condition that the environmental temperature is not greater than the temperature value associated with the target resistor, the target relay is disconnected so as to adjust the working state of the target resistor to be a path state.
The closing and opening of the relay means that when the input quantity (such as voltage, current, temperature, and the like) of the relay reaches a specified value, the controlled output circuit of the relay is turned on or off.
Optionally, as shown in fig. 5, the CTR of the optocoupler may gradually decay with the increase of the usage time, and the terminal adjusts the temperature value associated with the target resistance as follows: acquiring the service life of an air conditioner outdoor unit; taking the first temperature value as a temperature value associated with the target resistance when the used age reaches a first threshold value; and taking the second temperature value as the temperature value associated with the target resistance under the condition that the used age reaches a second threshold value, wherein the second threshold value is larger than the first threshold value, and the second temperature value is smaller than the first temperature value. For example, the temperature value associated with the target resistance is 50 ℃ when used for 1 year, 40 ℃ when used for 10 years, and 30 ℃ when used for 20 years.
Alternatively, the temperature value associated with the target resistance decreases by 10 ℃ every 10 years of increase in the lifetime of the air conditioner.
As an alternative example, the following describes the technical solution of the present application in combination with the specific embodiments:
most of the air conditioners today are composed of an indoor unit and an outdoor unit. The indoor unit and the outdoor unit need to communicate with each other to realize complex functions. For example, the inverter air conditioner needs to change the operating frequency of the compressor of the outdoor unit according to different operating conditions, which requires frequent communication between the indoor unit and the outdoor unit. The distance between the inner machine and the outer machine is long and a lot of interference exists. In order to ensure the reliability of communication between the internal unit and the external unit, the communication mode between the internal unit and the external unit usually adopts a three-wire system. The connecting line between the indoor unit and the outdoor unit comprises a zero line, a live wire and a communication line, so that half-duplex asynchronous serial port communication is formed, and the communication is safe, reliable and low in cost. In a communication Current loop, a photocoupler is usually adopted to achieve the purpose of isolation protection, and the CTR (Current transfer ratio) of the photocoupler is an important parameter of the photocoupler, that is, the minimum value of the ratio of the output Current (IC) of the secondary side of the photocoupler to the input Current (IF) of the primary side of the photocoupler. Generally, the CTR value of the optical coupler gradually attenuates along with the use duration and the temperature rise. The decrease of the CTR value may cause a failure of a function of optically coupling in a circuit, thereby causing a communication failure of the air conditioner indoor and outdoor units. The related technology provides an air conditioner indoor and outdoor unit communication fault processing method, a control system and an air conditioner, the current operation mode of the air conditioner is switched by adjusting the on-off state of a four-way valve of the air conditioner, the purpose of adjusting the temperature of an inner cavity of an outdoor unit is achieved, and the problem of indoor and outdoor unit communication faults caused by the fact that the CTR of an optical coupler is attenuated aggravatedly when the optical coupler works at an extremely low or extremely high temperature is solved.
The communication circuit of the indoor unit and the outdoor unit of the air conditioner has the following problems:
1. and the CTR of the optocoupler in the communication loop of the air conditioner outdoor unit is attenuated along with the rise of temperature and the use duration to cause communication faults. Generally, the CTR value of the optical coupler gradually attenuates along with the use duration and the temperature. The reduction of the CTR value can cause that a triode in the optocoupler cannot normally work in a saturation region, so that the output current of the optocoupler is reduced, the data packet loss rate is increased in the communication process, and even communication cannot be performed.
2. Communication faults are caused under the high-temperature environment, so that the air conditioner cannot work normally, and the user experience is poor. The higher the temperature, the smaller the CTR value, the more the communication fault is caused, and the air conditioner stops working. However, at this time, the higher the temperature, the more the user's demand for the air conditioner is. The stability of the air conditioner in a high temperature environment is very important.
3. The user experience is poor as the air conditioner communication function is weakened or permanently lost due to the attenuation of the CTR value caused by the increase of the using time. The longer the service life of the product, the fewer faults, the better the user experience, and the higher the user acceptance of the product.
Generally, the higher the temperature is, the higher the dependence of the user on the air conditioner and the performance requirement of the air conditioner are, so that it is very necessary for the air conditioner to operate stably under high temperature conditions. Therefore, the embodiment provides an automatic control circuit for responding attenuation of the zero-live line communication optical coupler CTR. The embodiment mainly aims at the problem of communication faults caused by attenuation of the optocoupler CTR in the communication loop of the air conditioner outdoor unit in a high-temperature environment. Generally, in order to realize the refrigeration of the indoor unit, the outdoor unit of the air conditioner needs to dissipate heat, and the temperature of the cavity where the outdoor unit control main board is located is increased in an outdoor high-temperature environment, which is a precondition working environment of the embodiment.
Fig. 6 is a schematic diagram illustrating a three-wire system zero-power line communication of an optional air conditioner internal and external unit according to an embodiment of the present application. The diode D in the communication loop is to ensure unidirectional conduction of the current loop. The voltage of the zero-live wire communication power supply is usually over 50V, the MCU (micro control unit) and the corresponding driving voltage are usually 5V or 3.3V, and the OP-1, OP-2, OP-3 and OP-4 are optical couplers, so that the high-low voltage electrical isolation is realized. The resistor R in the current loop functions as a current limit. The resistors R-1 to R-N (comprising the resistors R-1, R-2 and R-3. the resistors R-N are N resistors) and the resistor R are current-limiting resistors. The MCU can control the relay drive circuit to short circuit the current limiting resistor R-x (namely any target resistor), so that the aims of offline the resistor and reducing the total resistance of a communication current loop are fulfilled. As shown in fig. 6, only the relay and driving circuit diagram corresponding to the current limiting resistor R-1 is shown, the other current limiting resistors R-2 and R-3 and their corresponding relays and driving circuits are not shown, but the structures and control methods are the same, and each relay driving circuit is connected with the external unit MCU by using different circuits to realize separate control.
When the outer machine communicates with the inner machine, the outer machine is an upper machine (an upper machine, an active sender of information) at the moment, and the inner machine is a lower machine (a lower machine, an active receiver of information). In order to ensure the smoothness of a communication loop, the MCU in the upper computer controls the optical coupler OP-4 to be continuously switched on, at the moment, the upper computer controls the optical coupler OP-1 to be sequentially switched on and switched off, and meanwhile, the optical coupler OP-3 of the lower computer receives information sent by the upper computer. In this way, communication is established. It needs to be known that when the upper computer sends information through the optical coupler OP-1, the optical coupler in the upper computer receives the information sent by the optical coupler OP-1 through the same OP-2. The spontaneous and self-receiving working mode can realize the self-checking of information sending and can detect whether the communication loop is normal or not.
The communication loop has certain current, the higher the temperature is, the longer the service time is, the smaller the current transmission ratio is, the higher the possibility that the MCU cannot receive signals is, and the more possible communication faults are. The type one of the fault phenomenon: the outdoor unit is an upper computer, and the working environment temperature is high; the inner machine is a lower machine, and the temperature of the working environment is low. The optical coupler OP-1 sends data, and because the temperature of the external machine is high, the signal receiving fault where the optical coupler OP-2 is located occurs, and the upper computer cannot complete self-receiving self-checking. The inner machine can complete the data receiving due to low temperature. The external machine cannot complete self-sending and self-receiving verification, and the communication of the external machine fails. The type two of the fault phenomenon: the outdoor unit is a lower computer, and the working environment temperature is high; the internal machine is an upper computer, and the temperature of the working environment is low. The optical coupler OP-4 sends data, and the optical coupler OP-3 receives the data to complete spontaneous self-checking of the upper computer. And because the temperature of the external machine is high, the signal receiving fault of the optical coupler OP-2 is caused, and the lower machine cannot receive the data sent by the internal machine. Communication failure between the internal and external devices.
The main problems of communication faults caused by CTR attenuation of the optical coupler are that the current in a communication loop is not large, and the current transmission ratio is too small under a high-temperature working condition. However, the current in the communication loop should not be too large in case of relatively normal temperature. Therefore, when the temperature is too high, the stability of communication can be improved by selectively increasing the current in the communication loop. If it is desired to achieve an increase in the communication loop current, this can be achieved by reducing the resistance in the communication loop.
When the air conditioner external unit detects that the temperature in the cavity where the control mainboard is located is higher than a preset value, the relay K-1 starts to be controlled to be closed, the resistor R-1 is short-circuited, and therefore the current in the communication loop is increased. When the temperature is higher than the set temperature gear 2, the relay K-2 and the short-circuit resistor R-2 are controlled to be closed on the basis of closing the relay 1, and the current in the communication loop is further increased. And the stable operation of communication is ensured. And when the temperature of the cavity is lower than the corresponding design temperature, the corresponding relay is disconnected.
When the use time is too long, the starting temperature is reduced. For example: the start-up temperature was 50 ℃. Closing K-1 when the temperature of the cavity is 50 ℃; closing K-2 at 60 ℃ on the basis of closing K-1; at 70 ℃, K-3 is closed on the basis of closing K-1 and K-2. That is, when the start-up temperature is reached, one more switch is activated for every 10 ℃ rise. When used for 1 year, the start-up temperature was 50 ℃. When used for 10 years, the start-up temperature drops to 40 ℃. When used for 20 years, the start-up temperature drops to 30 ℃. The start temperature decreased by 10 ℃ every 10 years of increase.
This embodiment is in order to solve the communication trouble problem that the CTR because of the opto-coupler leads to, through under high temperature environment, the method of control relay reduction resistance value in the communication loop prevents the communication trouble because of the attenuation of opto-coupler CTR leads to, improves communication stability, makes communication stability higher under the high temperature environment, and user experience nature is better, and product life is longer.
This scheme is through the resistance value in changing communication circuit according to ambient temperature to adjust the electric current size in the communication loop that opto-coupler device belongs to, reached and adjusted the electric current with the purpose of maintaining normal communication along with the temperature change, solved because the temperature risees and leads to the electric current transmission ratio of opto-coupler to reduce the technical problem that causes communication circuit communication trouble, thereby realized improving communication stability's technological effect. In addition, parameters (resistance-associated temperature values) used in current regulation are adjusted according to the service life of the air conditioner, and the problems that the communication function of the air conditioner is weakened or permanently lost and the user experience is poor due to the fact that the CTR value is attenuated along with the increase of the service life are solved.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
According to another aspect of the embodiments of the present application, there is also provided a communication circuit for implementing the above communication circuit control method. Fig. 7(a) is a schematic diagram of an alternative communication circuit according to an embodiment of the present application, and as shown in fig. 7(a), the communication circuit may include: the first circuit is positioned in the air conditioner external machine and is connected to a live wire port (L) and a zero line port (N) of a power supply; the second circuit is positioned in the air conditioner and is connected to a live wire port (L) and a zero line port (N) of the power supply; the temperature measuring circuit is used for measuring the ambient temperature of the air conditioner external unit; the variable resistance circuit is positioned on a communication line (COM) between the first circuit and the second circuit and used for changing the resistance value of the communication circuit by adjusting the working resistance value of the variable resistance circuit according to the environmental temperature so as to adjust the loop current, wherein the loop current is the working current of the optical coupler device, the optical coupler device is used for realizing isolation protection when communication is carried out between an air conditioner internal unit and an air conditioner external unit, and the variable resistance circuit is electrically connected with the temperature measuring circuit. Fig. 7(b) is a schematic diagram illustrating an alternative communication circuit module connection according to an embodiment of the present application.
Optionally, the resistance variable circuit comprises: the loop current adjusting circuit comprises a plurality of resistors (R-1, R-2.. rightwards.R-N, N in total, only R-1 and R-N are drawn in figure 7 (a)), one end of each resistor is electrically connected with a first circuit, the other end of each resistor is electrically connected with a second circuit, and when the loop current is adjusted, the working resistance value of the resistor variable circuit is changed along with the change of the working state of the resistor in the resistor variable circuit, wherein the working state comprises a pass state and a short-circuit state.
Optionally, the resistance variable circuit further comprises: the circuit comprises a plurality of relays (K-1, K-2.. K-N, N in total, and only K-1 and K-N are drawn in figure 7 (a)), each resistor is connected in parallel with one relay, and the relays are used for controlling the working state of the parallel resistors by changing the opening and closing state. Fig. 7(c) is a schematic diagram of a connection of a communication circuit module according to another alternative embodiment of the present application, and a temperature measuring circuit is electrically connected to each relay in the resistance variable circuit.
Optionally, the first circuit includes a processor, the processor is electrically connected to the temperature measurement circuit and the plurality of relays, respectively, and the processor is configured to send a target signal to a target relay of the plurality of relays according to the ambient temperature measured by the temperature measurement circuit, where the target signal is used to change an on/off state of the target relay.
Optionally, the processor is electrically connected to the plurality of relays (K-1, K-2.. K-N, N in total) through a plurality of electrically controlled switches (M-1, M-2.... K-N, only M-1 is drawn in fig. 7 (a)), as shown in fig. 7(a), the processor sends a target signal to the electrically controlled switch M-1, and when the target signal is a high-level signal, the electrically controlled switch M-1 is turned on, the relay K-1 is closed, and the short-circuit resistor R-1 is connected. Fig. 7(d) is a schematic diagram illustrating a connection of a further alternative communication circuit module according to an embodiment of the present application, in which the temperature measuring circuit is electrically connected to a processor in the first circuit, and the processor is electrically connected to each relay in the resistance variable circuit.
Through above-mentioned communication circuit, can solve because the temperature risees and leads to the current transmission ratio of opto-coupler to reduce the technical problem that causes communication circuit communication trouble, and then reach the technological effect who improves communication stability.
According to another aspect of the embodiments of the present application, there is also provided a communication circuit control apparatus for implementing the communication circuit control method described above. Fig. 8 is a schematic diagram of an alternative communication circuit control apparatus according to an embodiment of the present application, as shown in fig. 8, the apparatus may include:
an obtaining module 82, configured to obtain an ambient temperature, where the ambient temperature is a temperature of an environment where an external air conditioner is located;
and the adjusting module 84 is used for adjusting the loop current passing through the communication line by adjusting the working resistance value of the resistance variable circuit on the communication line according to the ambient temperature, wherein the loop current is the working current of the optical coupler device, and the optical coupler device is used for realizing isolation protection when communication is carried out between the air conditioner internal unit and the air conditioner external unit.
It should be noted that the obtaining module 82 in this embodiment may be configured to execute step S202 in this embodiment, and the adjusting module 84 in this embodiment may be configured to execute step S204 in this embodiment.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the modules described above as a part of the apparatus may operate in a hardware environment as shown in fig. 1, and may be implemented by software or hardware.
Through above-mentioned module, can solve because the temperature risees and leads to the current transmission ratio of opto-coupler to reduce the technical problem that causes communication circuit communication trouble, and then reach the technological effect who improves communication stability.
As an alternative embodiment, the adjusting module 84 is further configured to: and adjusting the working resistance value of the resistance variable circuit according to the ambient temperature to adjust the loop current, wherein the resistance variable circuit is a circuit with an adjustable resistance value.
Optionally, the adjusting module 84 further comprises: the determining unit is used for determining a resistance value range according to the ambient temperature, wherein the resistance value range is used for adjusting the loop current to be within a range allowed by the optical coupler device when the optical coupler device normally works in the ambient temperature; and the adjusting unit is used for adjusting the working resistance value of the resistance variable circuit to be within the resistance value range.
Optionally, the resistance variable circuit includes a plurality of resistors connected in series, and the adjusting module 84 further includes: the comparison unit is used for obtaining a comparison result between the environment temperature and a temperature value associated with a target resistor, wherein the target resistor is any resistor in the variable resistor circuit, and each resistor in the variable resistor circuit is associated with a preset temperature value; and the control unit is used for controlling the working state of the target resistor in the variable resistor circuit according to the comparison result so as to adjust the working resistance value of the variable resistor circuit, wherein the working state comprises a pass state and a short-circuit state.
Optionally, each resistor has a parallel relay, and the control unit is further configured to: under the condition that the environmental temperature is higher than the temperature value associated with the target resistor, closing the target relay to adjust the working state of the target resistor to be in a short-circuit state, wherein the target relay is a relay connected with the target resistor in parallel; and under the condition that the environmental temperature is not greater than the temperature value associated with the target resistor, the target relay is disconnected so as to adjust the working state of the target resistor to be a path state.
Optionally, the comparison unit is further configured to, before obtaining a comparison result between the ambient temperature and the temperature value associated with the target resistance, adjust the temperature value associated with the target resistance as follows: acquiring the service life of an air conditioner outdoor unit; taking the first temperature value as a temperature value associated with the target resistance when the used age reaches a first threshold value; and taking the second temperature value as the temperature value associated with the target resistance under the condition that the used age reaches a second threshold value, wherein the second threshold value is larger than the first threshold value, and the second temperature value is smaller than the first temperature value.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the modules described above as a part of the apparatus may be operated in a hardware environment as shown in fig. 1, and may be implemented by software, or may be implemented by hardware, where the hardware environment includes a network environment.
According to another aspect of the embodiments of the present application, there is also provided a server or a terminal for implementing the communication circuit control method.
Fig. 9 is a block diagram of a terminal according to an embodiment of the present application, and as shown in fig. 9, the terminal may include: one or more processors 901 (only one of which is shown in fig. 9), a memory 903, and a transmission apparatus 905, as shown in fig. 9, the terminal may further include an input-output device 907.
The memory 903 may be used to store software programs and modules, such as program instructions/modules corresponding to the communication circuit control method and apparatus in the embodiments of the present application, and the processor 901 executes various functional applications and data processing by running the software programs and modules stored in the memory 903, that is, implementing the communication circuit control method. The memory 903 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 903 may further include memory located remotely from the processor 901, which may be connected to the terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The above-mentioned transmission device 905 is used for receiving or sending data via a network, and can also be used for data transmission between a processor and a memory. Examples of the network may include a wired network and a wireless network. In one example, the transmission device 905 includes a Network adapter (NIC) that can be connected to a router via a Network cable and other Network devices so as to communicate with the internet or a local area Network. In one example, the transmission device 905 is a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
The memory 903 is used for storing, among other things, application programs.
The processor 901 may invoke an application stored in the memory 903 through the transmission device 905 to perform the following steps: acquiring an ambient temperature, wherein the ambient temperature is the temperature of the environment where an air conditioner external unit is located; according to the environment temperature, the loop current passing through the communication line is adjusted by adjusting the working resistance value of the resistance variable circuit on the communication line, wherein the loop current is the working current of the optical coupler device, and the optical coupler device is used for realizing isolation protection when communication is carried out between the air conditioner internal unit and the air conditioner external unit.
By adopting the embodiment of the application, a scheme for controlling the communication circuit is provided. The resistance value in the communication circuit is changed according to the environment temperature to adjust the current in the communication loop where the optical coupler device is located, the purpose of adjusting the current along with the temperature change to maintain normal communication is achieved, the technical problem that the communication fault of the communication circuit is caused by the fact that the current transmission ratio of the optical coupler is reduced due to the fact that the temperature rises is solved, and the technical effect of improving the communication stability is achieved.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
It can be understood by those skilled in the art that the structure shown in fig. 9 is only an illustration, and the terminal may be a terminal device such as an intelligent air conditioner, an intelligent home control device, and the like. Fig. 9 does not limit the structure of the electronic device. For example, the terminal may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 9, or have a different configuration than shown in FIG. 9.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program instructing hardware associated with the terminal device, where the program may be stored in a computer-readable storage medium, and the storage medium may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
Embodiments of the present application also provide a storage medium. Alternatively, in this embodiment, the storage medium may be a program code for executing the communication circuit control method.
Optionally, in this embodiment, the storage medium may be located on at least one of a plurality of network devices in a network shown in the above embodiment.
Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:
s1, acquiring the ambient temperature, wherein the ambient temperature is the temperature of the environment where the air conditioner external unit is located;
and S2, adjusting the loop current passing through the communication line by adjusting the working resistance value of the resistance variable circuit on the communication line according to the environment temperature, wherein the loop current is the working current of an optical coupler device, and the optical coupler device is used for realizing isolation protection when the communication is carried out between the air conditioner internal unit and the air conditioner external unit.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
Optionally, in this embodiment, the storage medium may include but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including instructions for causing one or more computer devices (which may be personal computers, servers, network devices, or the like) to execute all or part of the steps of the method described in the embodiments of the present application.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (12)
1. A communication circuit, comprising:
the first circuit is positioned in the air conditioner external machine and is connected to a live wire port and a zero line port of a power supply;
the second circuit is positioned in the air conditioner and is connected to a live wire port and a zero line port of the power supply;
the temperature measuring circuit is used for measuring the ambient temperature of the air conditioner external unit;
and the resistance variable circuit is positioned on a communication line between the first circuit and the second circuit and used for changing the resistance value of the communication circuit by adjusting the working resistance value of the resistance variable circuit according to the environment temperature so as to adjust the loop current, wherein the loop current is the working current of the optical coupler device, the optical coupler device is used for realizing isolation protection when communication is carried out between an air conditioner internal unit and an air conditioner external unit, and the resistance variable circuit is electrically connected with the temperature measuring circuit.
2. The circuit of claim 1, wherein the resistance variable circuit comprises:
the loop current adjusting circuit comprises a plurality of resistors connected in series, one end of each resistor is electrically connected with the first circuit, the other end of each resistor is electrically connected with the second circuit, and when the loop current is adjusted, the working resistance value of the resistor variable circuit is changed along with the change of the working state of the resistor in the resistor variable circuit, wherein the working state comprises a pass state and a short-circuit state.
3. The circuit of claim 2, wherein the resistance variable circuit further comprises:
and each resistor is connected with one relay in parallel, and the relays are used for controlling the working state of the parallel resistors by changing the opening and closing state.
4. The circuit of claim 3,
the first circuit comprises a processor, the processor is respectively and electrically connected with the temperature measuring circuit and the relays, and the processor is used for sending a target signal to a target relay in the relays according to the environmental temperature measured by the temperature measuring circuit, wherein the target signal is used for changing the on-off state of the target relay.
5. A method for controlling a communication circuit, comprising:
acquiring an ambient temperature, wherein the ambient temperature is the temperature of the environment where an air conditioner external unit is located;
and adjusting the loop current passing through the communication line by adjusting the working resistance value of a resistance variable circuit on the communication line according to the environment temperature, wherein the loop current is the working current of an optical coupler device, and the optical coupler device is used for realizing isolation protection when the air conditioner internal unit and the air conditioner external unit are communicated.
6. The method of claim 5, wherein adjusting the loop current through the communication line by adjusting the operating resistance of a resistance variable circuit on the communication line based on the ambient temperature comprises:
determining a resistance value range according to the environment temperature, wherein the resistance value range is used for adjusting the loop current to be within a range allowed by the optical coupler device when the optical coupler device normally works in the environment temperature;
and adjusting the working resistance value of the resistance variable circuit to be within the resistance value range.
7. The method of claim 5, wherein the resistance variable circuit comprises a plurality of resistors connected in series, and adjusting the loop current through the communication line by adjusting the operating resistance of the resistance variable circuit on the communication line based on the ambient temperature comprises controlling each of the resistors in the resistance variable circuit as follows:
obtaining a comparison result between the environment temperature and a temperature value associated with a target resistor, wherein the target resistor is any resistor in the resistor variable circuit, and each resistor in the resistor variable circuit is associated with a preset temperature value;
and controlling the working state of the target resistor in the variable resistor circuit according to the comparison result so as to adjust the working resistance of the variable resistor circuit, wherein the working state comprises a pass state and a short-circuit state.
8. The method of claim 7, wherein each resistor has a parallel relay, and controlling the operating state of the target resistor in the resistance variable circuit according to the comparison result comprises:
under the condition that the environmental temperature is higher than the temperature value associated with the target resistor, closing a target relay to adjust the working state of the target resistor to be a short-circuit state, wherein the target relay is a relay connected with the target resistor in parallel;
and under the condition that the environmental temperature is not greater than the temperature value associated with the target resistor, the target relay is disconnected so as to adjust the working state of the target resistor to be a path state.
9. The method of claim 7, wherein prior to obtaining the comparison between the ambient temperature and the temperature value associated with the target resistance, the method further comprises adjusting the temperature value associated with the target resistance as follows:
acquiring the service life of the air conditioner external unit;
taking a first temperature value as a temperature value associated with the target resistance if the age has reached a first threshold;
and taking a second temperature value as a temperature value associated with the target resistance when the used age reaches a second threshold value, wherein the second threshold value is greater than the first threshold value, and the second temperature value is less than the first temperature value.
10. A communication circuit control apparatus, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the ambient temperature, and the ambient temperature is the temperature of the environment where the air conditioner external unit is located;
and the adjusting module is used for adjusting the loop current passing through the communication line by adjusting the working resistance value of a resistance variable circuit on the communication line according to the environment temperature, wherein the loop current is the working current of an optical coupler device, and the optical coupler device is used for realizing isolation protection when communication is carried out between the air conditioner internal unit and the air conditioner external unit.
11. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of the communication circuit control method according to any one of claims 5 to 9 by the computer program.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the communication circuit control method according to any one of claims 5 to 9.
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