CN114791157A - Communication device of air conditioner outdoor unit and communication system of air conditioner - Google Patents
Communication device of air conditioner outdoor unit and communication system of air conditioner Download PDFInfo
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- CN114791157A CN114791157A CN202210398697.7A CN202210398697A CN114791157A CN 114791157 A CN114791157 A CN 114791157A CN 202210398697 A CN202210398697 A CN 202210398697A CN 114791157 A CN114791157 A CN 114791157A
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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Abstract
The application discloses communication device of outer machine of air conditioner and communication system of air conditioner. Wherein, this communication device includes: the signal transmitting unit comprises a first optical coupler and a second resistance variable circuit used for controlling the input current of the first optical coupler within a normal range; the signal receiving unit comprises a second optical coupler and a first resistance variable circuit used for controlling the input current of the second optical coupler within a normal range; and the micro control unit is respectively electrically connected with the signal sending unit and the signal receiving unit and is used for sending signals through the signal sending unit and receiving signals through the signal receiving unit. The technical problem that communication faults exist in the internal machine and the external machine of the air conditioning system in the related technology is solved.
Description
Technical Field
The application relates to the field of electric appliances, in particular to a communication device of an air conditioner external unit and a communication system of an air conditioner.
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 complicated 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 optocoupler is an important parameter of the optocoupler, that is, the minimum value of the input Current (IF) at the primary side of the optocoupler and the output Current (IC) at the secondary side of the optocoupler. 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 the failure of the function of the optical coupler in the circuit, thereby causing the communication failure of the air conditioner indoor and outdoor units.
Patent No. CN113587385A proposes an air conditioner indoor and outdoor unit communication fault handling method, a control system and an air conditioner, which switches the current operation mode of the air conditioner by adjusting the on-off state of the four-way valve of the air conditioner, so as to achieve the purpose of adjusting the temperature of the inner cavity of the outdoor unit, and solve the problem of indoor and outdoor unit communication fault caused by the aggravated attenuation of the CTR of the optical coupler when the optical coupler works at an extremely low or high temperature. However, this method is slow to implement and requires a change in the operating state of the air conditioner.
In view of the above-mentioned problem of communication failure between the internal and external devices of the air conditioning system in the related art, no effective solution has been proposed yet.
Disclosure of Invention
The embodiment of the application provides a communication device of an air conditioner external unit and a communication system of an air conditioner, and aims to solve the technical problem that communication faults exist in the internal unit and the external unit of the air conditioner system in the related art at least.
According to an aspect of an embodiment of the present application, there is provided a communication device for an outdoor unit of an air conditioner, including: the signal transmitting unit comprises a first optical coupler and a second resistance variable circuit used for controlling the input current of the first optical coupler within a normal range; the signal receiving unit comprises a second optical coupler and a first resistance variable circuit used for controlling the input current of the second optical coupler within a normal range; and the micro control unit is respectively electrically connected with the signal sending unit and the signal receiving unit and is used for sending signals through the signal sending unit and receiving signals through the signal receiving unit.
Optionally, the second resistance variable circuit includes: the micro-control unit comprises a first resistor and a second resistor which are connected in series, wherein each second resistor is provided with an on-off switch connected in parallel, and the on-off switch connected in parallel with each second resistor is controlled by the micro-control unit to be on or off.
Optionally, the number of the second resistors is multiple, the on-off switch connected in parallel with each second resistor is a normally open switch, each second resistor corresponds to one temperature range, and two adjacent second resistors correspond to two adjacent temperature ranges; the micro control unit is used for: under the condition that a first temperature range of the temperature detected this time is higher than a second temperature range of the temperature detected last time, closing an on-off switch which is connected with the second resistor in parallel and corresponds to the second temperature range; and under the condition that the first temperature range is lower than the second temperature range, the on-off switch connected with the second resistor in parallel corresponding to the second temperature range is switched off.
Optionally, the plurality of second resistors are resistors connected in series, and the starting temperature of the temperature range corresponding to the first target resistor adjacent to the first resistor in the plurality of second resistors is inversely related to the service life of the air conditioner external unit.
Optionally, the second resistance variable circuit includes: and adopting a third resistor with a negative temperature coefficient, wherein the resistance value of the third resistor is smaller as the temperature is higher.
Optionally, the first resistance variable circuit comprises: the micro-control unit is used for controlling the on-off of the on-off switch, and the on-off of the on-off switch is controlled by the micro-control unit.
Optionally, the number of the fifth resistors is multiple, the on-off switch connected in parallel with each fifth resistor is a normally closed switch, each fifth resistor corresponds to one temperature range, and two adjacent fifth resistors correspond to two adjacent temperature ranges; the micro control unit is used for: under the condition that a first temperature range of the temperature detected this time is higher than a second temperature range of the temperature detected last time, the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range is switched off; and under the condition that the first temperature range is lower than the second temperature range, closing the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range.
Optionally, the fifth resistors are resistors connected in series, and the starting temperature of the temperature range corresponding to the second target resistor adjacent to the fourth resistor in the fifth resistors is inversely related to the service life of the air conditioner external unit.
Optionally, the first resistance variable circuit comprises: and a sixth resistor with positive temperature coefficient is adopted, wherein the higher the temperature is, the larger the resistance value of the sixth resistor is.
According to another aspect of the embodiments of the present application, there is also provided an air conditioner communication system, including: the communication device of the air conditioner outdoor unit; and the communication device of the air conditioner internal unit is electrically connected with the communication device of the air conditioner external unit.
In an embodiment of the present application, the signal transmitting unit includes a first optical coupler and a second resistance variable circuit for controlling an input current of the first optical coupler within a normal range; the signal receiving unit comprises a second optical coupler and a first resistance variable circuit used for controlling the input current of the second optical coupler within a normal range; and the micro control unit is respectively electrically connected with the signal sending unit and the signal receiving unit and is used for sending signals through the signal sending unit and receiving signals through the signal receiving unit. The working current of the optocoupler can be controlled by adjusting the resistance value of the resistor in the data transmission process, and the technical problem that communication faults exist in an internal machine and an external machine of an air conditioning system in the related technology can be solved.
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 schematic view illustrating an alternative communication device of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an alternative air conditioning system communication scheme according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an alternative CTR curve according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an alternative CTR curve in accordance with embodiments of the present application;
FIG. 5 is a schematic diagram of an alternative CTR curve in accordance with embodiments of the present application; and (c) a second step of,
FIG. 6 is a schematic diagram of an alternative resistance control circuit 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 accompanying drawings 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.
The solutions in the related art have the following drawbacks:
1) the communication fault problem that the CTR of opto-coupler in the outer quick-witted communication loop of air conditioner attenuates along with the rise of temperature, length of service time and the decay of communication that leads to, the CTR value of opto-coupler can attenuate along with length of service time and temperature rise gradually usually. The reduction of the CTR value can cause that a triode in the optocoupler cannot normally work in a saturation area, so that the output current of the optocoupler is reduced, the data packet loss rate in the communication process is increased, and even communication cannot be performed.
2) Lead to communication trouble and then lead to the unable normal work of air conditioner, user experience poor problem under the high temperature environment: the higher the temperature, the smaller the CTR value, the more communication failure occurs, and the air conditioner stops operating. However, at this time, the higher the temperature is, 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 problem that the communication function of the air conditioner is weakened or permanently lost due to the attenuation of the CTR value caused by the increase of the using time is poor in user experience: 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.
This scheme is through under high temperature environment, and control switch prevents because of the communication trouble that the decay of opto-coupler CTR leads to, improves communication stability through the method that control switch reduces resistance value among the communication level converting circuit, has solved the communication trouble problem that the CTR of opto-coupler leads to, and communication stability is higher under the high temperature environment, and user experience nature is better, and product life is longer. According to an aspect of the embodiments of the present application, an embodiment of a communication device for an outdoor unit of an air conditioner is provided. Fig. 1 is a schematic view of an alternative communication device of an air conditioner outdoor unit according to an embodiment of the present application, as shown in fig. 1, including the following units:
the signal transmission device comprises a signal transmission unit 101, wherein the signal transmission unit comprises a first optical coupler and a second resistance variable circuit (namely, an equivalent resistance of R2 in fig. 2, as shown in fig. 6) for controlling the input current of the first optical coupler within a normal range.
Optionally, the second resistance variable circuit includes: a first resistor (such as R2 in figure 6) and a second resistor which are connected in series, wherein each second resistor is provided with an on-off switch connected in parallel, and the on-off switch connected in parallel with each second resistor is controlled by the micro control unit to be switched on and off.
Optionally, the number of the second resistors is multiple (e.g., R21 to R2N in fig. 6), the on-off switch connected in parallel to each second resistor is a normally open switch, each second resistor corresponds to one temperature range, and two adjacent second resistors correspond to two adjacent temperature ranges; the micro control unit is used for: under the condition that the first temperature range of the temperature detected this time is higher than the second temperature range of the temperature detected last time, closing the on-off switch which is connected with the second resistor in parallel and corresponds to the second temperature range; and under the condition that the first temperature range is lower than the second temperature range, the on-off switch connected with the second resistor in parallel corresponding to the second temperature range is switched off.
Optionally, the plurality of second resistors are resistors connected in series, and a starting temperature of a temperature range corresponding to a first target resistor adjacent to the first resistor in the plurality of second resistors is negatively correlated with a service life of the air conditioner external unit.
Optionally, the second resistance variable circuit includes: and adopting a third resistor with a negative temperature coefficient, wherein the resistance value of the third resistor is smaller as the temperature is higher.
The signal receiving unit 103 comprises a second optical coupler and a first resistance variable circuit (namely, an equivalent resistance of R1 in FIG. 2, as shown in FIG. 6) for controlling the input current of the second optical coupler within a normal range.
Optionally, the first resistance variable circuit comprises: a fourth resistor (such as R1 in fig. 6) and a fifth resistor connected in series, wherein each of the fifth resistors has an on-off switch connected in parallel, and the on-off switch connected in parallel with each of the fifth resistors is controlled by the micro control unit to be switched on and off.
Optionally, the number of the fifth resistors is multiple (e.g., R11 to R1N in fig. 6), the on-off switch connected in parallel to each fifth resistor is a normally closed switch, each fifth resistor corresponds to one temperature range, and two adjacent fifth resistors correspond to two adjacent temperature ranges; the micro control unit is used for: under the condition that a first temperature range of the temperature detected this time is higher than a second temperature range of the temperature detected last time, the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range is switched off; and under the condition that the first temperature range is lower than the second temperature range, closing the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range.
Optionally, the fifth resistors are resistors connected in series, and a starting temperature of a temperature range corresponding to a second target resistor adjacent to the fourth resistor in the fifth resistors is inversely related to a service life of the air conditioner external unit.
Optionally, the first resistance variable circuit comprises: and a sixth resistor with a positive temperature coefficient is adopted, wherein the higher the temperature is, the larger the resistance value of the sixth resistor is.
And a Micro Control Unit (MCU) 105 electrically connected to the signal transmitting unit and the signal receiving unit, respectively, for transmitting signals through the signal transmitting unit and receiving signals through the signal receiving unit.
Through the scheme, the signal sending unit comprises a first optical coupler and a second resistance variable circuit used for controlling the input current of the first optical coupler within a normal range; the signal receiving unit comprises a second optical coupler and a first resistance variable circuit used for controlling the input current of the second optical coupler within a normal range; and the micro control unit is respectively electrically connected with the signal sending unit and the signal receiving unit and is used for sending signals through the signal sending unit and receiving signals through the signal receiving unit. The working current of the optocoupler can be controlled by adjusting the resistance value of the resistor in the data transmission process, and the technical problem that communication faults exist in an internal machine and an external machine of an air conditioning system in the related technology can be solved.
Nowadays, most of air conditioners are composed of an indoor unit and an outdoor unit, and 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 indoor unit and the outdoor unit is long, a lot of interference exists, in order to ensure the reliability of communication between the indoor unit and the outdoor unit, the communication mode between the indoor unit and the outdoor unit usually adopts a three-wire system, and a connecting wire between the indoor unit and the outdoor unit comprises a zero wire, a live wire and a communication wire, 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 photoelectric coupler is usually adopted to achieve the purpose of isolation protection, the photoelectric coupler is abbreviated as an optocoupler, and the CTR (Current transfer ratio) of the optocoupler is an important parameter of the optocoupler, that is, the minimum value of the ratio of the output Current (IC) at the secondary side of the optocoupler to the input Current (IF) at the primary side of the optocoupler. 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 the failure of the function of the optical coupler in the circuit, thereby causing the communication failure of the air conditioner indoor and outdoor units.
Generally, the higher the temperature is, the higher the user's dependence on the air conditioner and the performance requirements of the air conditioner are, so it is very necessary that the air conditioner be operated stably under high temperature conditions. Therefore, the invention provides an automatic control circuit for responding to attenuation of a zero-live line communication optocoupler CTR.
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 controls the main board is increased in an outdoor high-temperature environment. The invention mainly aims at the problem of communication faults caused by attenuation of an optocoupler CTR in a communication loop of an air conditioner outdoor unit in a high-temperature environment.
The optocoupler (opto couplers, OP) is abbreviated as an optocoupler, the optocoupler adopts a phototriode and a light emitting diode, and the output current of the optocoupler triode is controlled by the intensity of light emitted by the light emitting diode through an input end, so that electrical isolation is realized. CTR (Current transfer ratio) of optical coupler, and output Current (I) of secondary side of optical coupler C ) Input current (I) to primary side of optical coupler F ) The minimum value of the ratio (as shown by an optical coupler OP-2 in a three-wire system zero-fire line communication schematic diagram of the air conditioner indoor and outdoor units in fig. 2). The CTR range is as large as 20% to 300% (e.g., 4N35), while the PC817 series is 50% to 600%.
The circuit structure and basic functions are introduced, as shown in fig. 2 (three-wire system zero-live wire communication schematic diagram of the air conditioner internal and external units), the diode D in the communication loop is used for ensuring the one-way conduction of the current loop. The voltage of the zero-live wire communication power supply generally exceeds 50V, the MCU and the corresponding driving voltage generally are 5V or 3.3V, and the OP-1, OP-2, OP-3 and OP-4 are optical couplers, so that high-low voltage electrical isolation is realized. The resistor R in the current loop functions as a current limit.
According to the principle analysis of the traditional three-wire system zero-live wire communication process, as shown in fig. 2 (a three-wire system zero-live wire communication principle diagram of an air conditioner inner unit and an outer unit), when the outer unit communicates with the inner unit, the outer unit is an upper unit (an upper computer, an active sender of information), and the inner unit is a lower unit (a lower computer, 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-3 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-4 of the lower computer receives information sent by the upper computer. Thus, communication is established. It needs to be known that when the upper computer sends information through the optical coupler OP-1, the optical coupler OP-2 in the upper computer also receives the information sent by the optical coupler OP-1. 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.
Communication fault principle analysis caused by CTR attenuation of the optical coupler: as shown in fig. 3 (graph of input current of the optical coupler and CTR), for the relationship between the input current IF of the optical coupler and CTR, as the input current IF increases, 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 is, the stronger the dependence of the user on the air conditioner is, the long-time high-temperature environment of the resistor is operated, so that the aging speed of the resistor is accelerated, the resistance value is changed, and the service life of the resistor is further shortened.
And low-voltage side (the operating supply voltage of the low-voltage side is generally +5V or + 3.3V): although the working current in the circuit is relatively large, the power of each resistor is small and the heat generation amount is smaller because the voltage on each resistor is small.
Further explanation of high side power consumption: 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 during working is not higher than 5V. 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. The voltage of the working power supply at 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.
Also, it is necessary to know the current I F Too large can lead to the life of opto-coupler device to shorten.
Therefore, the input current I of the optical coupler OP-1 F The resistance R2 is not too small; input current I of optical coupler OP-2 F It is not preferable that the resistance R1 is too small because of the influence of the current transfer ratio.
Above, the working current I in the communication current loop F It should not be too large. (including opto-coupler OP-1 current I in the outdoor unit F )。
As shown in fig. 5 (graph of usage duration of the optical coupler and CTR), the CTR of the optical coupler gradually attenuates as the usage duration increases. The core problem is as follows: the higher the temperature in the outdoor unit is, the longer the service time is, the smaller the current transmission ratio is, the higher the possibility of communication failure is, and the more possible communication failure is. Communication faults mainly occur in the optical couplers OP-1 and OP-2.
Analyzing the principle of the problem: as shown in fig. 4 (graph of optocoupler temperature and CTR), the input current IF of the solid curve is smaller than the input current IF of the dashed curve, although the optocoupler CTR with a large input current IF changes little with temperature, the working current in the communication current loop should not be too large, that is, the value of the optocoupler input current IF cannot be too large. With the continuous rising of temperature, the CTR of opto-coupler constantly reduces, and when the temperature is high enough, the CTR undersize leads to the saturation current value undersize of the phototriode in the opto-coupler, and when opto-coupler OP-2 received the signal, the phototriode in the opto-coupler probably works in the saturation region under the amplification region rather than normal condition, leads to the voltage of point A department too high (not 0V), can lead to the unexpected of triode Q1 to switch on when a point A voltage is too high. Finally, the MCU cannot correctly recognize the electrical signal, which results in incomplete communication. The solution is as follows: when the temperature rises, the resistance value of the R1 resistor is increased, so that the value of the current IC is reduced, the triode is prevented from working in an amplification area, the voltage of the point A is reduced, and the normal work of the optical coupler OP-2 is ensured.
Analyzing the principle of the problem: similarly, the optical coupler OP-1 causes signal transmission failure due to the fact that the input current IF is too small. The solution is as follows: when the temperature rises, the resistance value of the R2 resistor is reduced, so that the value of the current IF is increased, and the normal work of the optical coupler OP-1 is ensured.
The type one of the fault phenomenon is as follows: the outdoor unit is an upper computer, and the working environment temperature is high; the inner machine is a lower computer, and the temperature of the working environment is low. Because the temperature of the outdoor unit is high, the possibility of failure occurs in data sent by the optical coupler OP-1, the signal receiving failure of the optical coupler OP-2 is caused, 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.
According to the communication fault solution caused by CTR attenuation of the optical coupler, the resistance value of the R1 resistor is increased and the resistance value of the R2 resistor is reduced when the temperature rises.
As shown in fig. 6, the switch K1-x (x is 1 to a positive integer N) is a normally closed switch, and the switch K2-x is a normally open switch.
Namely, when the air conditioner outdoor unit detects that the temperature in the cavity where the control main board is located is higher than a preset value, the control switch K1-1 is started to be switched off, the control switch K2-1 is started to be switched on, the resistor R11 is connected in series to the circuit, and the short-circuit resistor R21 is started, so that the resistance value of the R1 resistor is increased, and the resistance value of the R2 resistor is reduced. When the temperature is higher than the set temperature gear 2, K1-2 is controlled to be opened and K2-2 is controlled to be closed on the basis of opening K1-1 and closing K2-1, the resistor R12 is connected in series to the circuit and the short-circuit resistor R22, the resistance value of the resistor R1 is further increased, and the resistance value of the resistor R2 is reduced. And the stable operation of communication is ensured. And when the temperature of the cavity is lower than the corresponding design temperature, the corresponding switch is switched off. When the use time is too long, the starting temperature is reduced.
Examples are as follows: the start-up temperature was 50 ℃. When the temperature of the cavity is 50 ℃, the switch K1-1 is controlled to be opened, and the switch K2-1 is controlled to be closed; controlling the K1-2 to be opened and the K2-2 to be closed on the basis of the K1-1 to be opened and the K2-1 to be closed at the temperature of 60 ℃; and so on. 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 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.
The circuit for preventing the communication fault caused by the attenuation of the CTR of the air conditioner aims at solving the problem of the communication fault caused by the CTR of the optical coupler, and has the advantages of higher communication stability in a high-temperature environment, better user experience and longer service life of products.
According to an aspect of the embodiments of the present application, an embodiment of a communication system of an air conditioner is provided. The communication device comprises the air conditioner external unit and the communication device of the air conditioner external unit.
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 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 the 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 apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be implemented in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, units or modules, and may be electrical or in other forms.
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 may be implemented in the form of hardware, or may also be implemented in the 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 (10)
1. A communication device of an outdoor unit of an air conditioner, comprising:
the signal transmitting unit comprises a first optical coupler and a second resistance variable circuit used for controlling the input current of the first optical coupler within a normal range;
the signal receiving unit comprises a second optical coupler and a first resistance variable circuit used for controlling the input current of the second optical coupler within a normal range;
and the micro control unit is respectively electrically connected with the signal sending unit and the signal receiving unit and is used for sending signals through the signal sending unit and receiving signals through the signal receiving unit.
2. The communication device of an outdoor unit of an air conditioner as claimed in claim 1, wherein the second resistance variable circuit comprises:
the circuit comprises a first resistor and a second resistor which are connected in series, wherein each second resistor is provided with an on-off switch connected in parallel, and the on-off switch connected in parallel with each second resistor is controlled by the micro-control unit to be switched on and off.
3. The communication device of an outdoor unit of an air conditioner as set forth in claim 2,
the number of the second resistors is multiple, the on-off switch connected in parallel with each second resistor is a normally open switch, each second resistor corresponds to one temperature range, and two adjacent second resistors correspond to two adjacent temperature ranges;
the micro control unit is used for: under the condition that the first temperature range of the temperature detected this time is higher than the second temperature range of the temperature detected last time, closing the on-off switch which is connected with the second resistor in parallel and corresponds to the second temperature range; and under the condition that the first temperature range is lower than the second temperature range, the on-off switch connected with the second resistor in parallel corresponding to the second temperature range is switched off.
4. The communication device of an outdoor unit of an air conditioner as claimed in claim 3, wherein the second resistors are serially connected resistors, and an initial temperature of a temperature range corresponding to a first target resistor adjacent to the first resistor among the second resistors is inversely related to a service life of the outdoor unit of the air conditioner.
5. The outdoor unit of an air conditioner of claim 1, wherein the second resistance variable circuit comprises:
and adopting a third resistor with a negative temperature coefficient, wherein the resistance value of the third resistor is smaller as the temperature is higher.
6. The communication device of an outdoor unit of an air conditioner as claimed in claim 1, wherein the first resistance variable circuit comprises:
the micro-control unit is used for controlling the on-off of the on-off switch, and the on-off of the on-off switch is controlled by the micro-control unit.
7. The communication device of an outdoor unit of an air conditioner as set forth in claim 6,
the number of the fifth resistors is multiple, the on-off switch connected in parallel with each fifth resistor is a normally closed switch, each fifth resistor corresponds to one temperature range, and two adjacent fifth resistors correspond to two adjacent temperature ranges;
the micro control unit is used for: under the condition that the first temperature range of the temperature detected this time is higher than the second temperature range of the temperature detected last time, the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range is switched off; and under the condition that the first temperature range is lower than the second temperature range, closing the on-off switch which is connected with the fifth resistor in parallel and corresponds to the second temperature range.
8. The communication device of the outdoor unit of an air conditioner as claimed in claim 7, wherein the fifth resistors are serially connected resistors, and an initial temperature of a temperature range corresponding to a second target resistor adjacent to the fourth resistor among the fifth resistors is inversely related to a service life of the outdoor unit of the air conditioner.
9. The communication device of an outdoor unit of an air conditioner as claimed in claim 1, wherein the first resistance variable circuit comprises:
and a sixth resistor with a positive temperature coefficient is adopted, wherein the higher the temperature is, the larger the resistance value of the sixth resistor is.
10. A communication system of an air conditioner, comprising:
the communication device of the outdoor unit of an air conditioner as claimed in any one of claims 1 to 9;
and the communication device of the air conditioner internal unit is electrically connected with the communication device of the air conditioner external unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210398697.7A CN114791157B (en) | 2022-04-15 | 2022-04-15 | Communication device of air conditioner external unit and communication system of air conditioner |
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| CN202210398697.7A CN114791157B (en) | 2022-04-15 | 2022-04-15 | Communication device of air conditioner external unit and communication system of air conditioner |
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| CN114791157B CN114791157B (en) | 2023-09-26 |
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| CN212692077U (en) * | 2020-07-15 | 2021-03-12 | Tcl空调器(中山)有限公司 | Communication circuit and air conditioner |
| CN113432207A (en) * | 2021-06-21 | 2021-09-24 | Tcl空调器(中山)有限公司 | Communication control method and device for indoor and outdoor units of air conditioner, air conditioner and storage medium |
| CN113432241A (en) * | 2021-06-21 | 2021-09-24 | Tcl空调器(中山)有限公司 | Air conditioner indoor and outdoor unit communication fault processing method, control system and air conditioner |
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| JP2009079811A (en) * | 2007-09-26 | 2009-04-16 | Sanyo Electric Co Ltd | Air conditioning system and indoor unit |
| CN210118934U (en) * | 2019-05-10 | 2020-02-28 | 广东美的制冷设备有限公司 | Communication circuit of air conditioner and air conditioner |
| CN110762742A (en) * | 2019-10-18 | 2020-02-07 | Tcl空调器(中山)有限公司 | Air conditioner control method and device, air conditioner and storage medium |
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