CN112303805B - Communication circuit and air conditioner - Google Patents
Communication circuit and air conditioner Download PDFInfo
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- CN112303805B CN112303805B CN202011121558.7A CN202011121558A CN112303805B CN 112303805 B CN112303805 B CN 112303805B CN 202011121558 A CN202011121558 A CN 202011121558A CN 112303805 B CN112303805 B CN 112303805B
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- 230000006854 communication Effects 0.000 title claims abstract description 137
- 238000004891 communication Methods 0.000 title claims abstract description 136
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000003780 insertion Methods 0.000 claims description 29
- 230000037431 insertion Effects 0.000 claims description 29
- 239000003507 refrigerant Substances 0.000 claims description 24
- 238000004804 winding Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Networks & Wireless Communication (AREA)
- Filters And Equalizers (AREA)
Abstract
The application discloses a communication circuit and an air conditioner, wherein the communication circuit comprises a main control substrate and a wire controller, the main control substrate further comprises a power supply loop, a differential mode inductor, a communication loop and a common mode inductor, the differential mode inductor comprises a first sub-inductor and a second sub-inductor which are connected in series, the inductance of the first sub-inductor and the inductance of the second sub-inductor are both one fourth of the inductance of the differential mode inductor, the volume of the differential mode inductor is reduced, the communication reliability is improved, and the cost is reduced.
Description
Technical Field
The application relates to the field of air conditioner control, in particular to a communication circuit and an air conditioner.
Background
The communication distance between the indoor unit of the air conditioner and the line controller can reach 600m at the maximum. Because of the longer communication distance, the problem of communication error code can sometimes occur in the communication process between the indoor unit and the line controller.
The differential mode inductance is an inductance with large inductance to differential mode high frequency interference, and can be used for filtering the differential mode high frequency interference. In the prior art, the above problem is solved by increasing the volume of the differential mode inductor, however, increasing the volume of the differential mode inductor can cause the typesetting difficulty of the PCB (Printed Circuit Board ) and increase the cost.
Therefore, how to provide a communication circuit capable of improving the communication reliability without increasing the differential-mode inductance volume is a technical problem to be solved at present.
Disclosure of Invention
The application provides a communication circuit which is used for solving the technical problems that in the prior art, in order to avoid communication error codes, the PCB typesetting is difficult and the cost is increased due to the increase of the volume of a differential mode inductor.
The communication circuit comprises a main control substrate and a wire controller, wherein the main control substrate also comprises a power circuit, a differential mode inductor, a communication circuit and a common mode inductor, the positive electrode of the power circuit is connected with the first end of the differential mode inductor, the common joint of the first end of the communication circuit and the first end of the common mode inductor is connected with the second end of the differential mode inductor, the second end of the common mode inductor is connected with the first end of a first communication wire, the third end of the common mode inductor is connected with the first end of a second communication wire, the second end of the communication circuit and the fourth end of the common mode inductor are connected with the negative electrode of the power circuit, the second end of the first communication wire and the second end of the second communication wire are respectively connected with the wire controller,
the differential-mode inductor comprises a first sub-inductor and a second sub-inductor which are connected in series, and the inductance of the first sub-inductor and the inductance of the second sub-inductor are both one fourth of the inductance of the differential-mode inductor.
In some embodiments of the present application, the inductance of the differential-mode inductor is determined according to a preset turning frequency and the impedance of the differential-mode inductor, and the impedance of the differential-mode inductor is determined according to a preset insertion loss, the impedance of the power supply loop, the total impedance of the first communication line and the second communication line, and the impedance of the communication loop.
In some embodiments of the present application, the predetermined insertion loss is a single-pole insertion loss, and the impedance of the differential mode inductor is determined according to formula one, where formula one is specifically:
wherein I is the preset insertion loss, Z A Z is the impedance of the power supply loop L Z is the impedance of the differential mode inductance B Z is the impedance of the communication loop C Is the total impedance of the first communication line and the second communication line.
In some embodiments of the present application, the preset insertion loss is a bipolar point insertion loss, and the impedance of the differential mode inductance is determined according to a formula two, where the formula two is specifically:
wherein I is the preset insertion loss, Z A Z is the impedance of the power supply loop L Z is the impedance of the differential mode inductance B Z is the impedance of the communication loop C Is the total impedance of the first communication line and the second communication line.
In some embodiments of the present application, the preset turning frequency is determined according to a ratio of the communication frequency of the master substrate to a preset coefficient.
In some embodiments of the present application, the impedance of the power circuit is determined according to the voltage of the power circuit and the current of the power circuit, the total impedance of the first communication line and the second communication line is determined according to the total length of the first communication line and the second communication line and the unit impedance corresponding to the unit length, and the impedance of the communication circuit is determined according to the voltage of the communication circuit and the current of the communication circuit.
In some embodiments of the present application, the first sub-inductor and the second sub-inductor are patch inductors.
In some embodiments of the application, the inductance of the first sub-inductance and the inductance of the second sub-inductance range from 0.6mH to 50mH.
In some embodiments of the present application, the first communication line and the second communication line are Home buses.
Correspondingly, the application also provides an air conditioner, which comprises:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
the air conditioner further comprises the communication circuit.
Through the application of the technical scheme, the communication circuit comprises a main control substrate and a wire controller, the main control substrate further comprises a power supply loop, a differential mode inductor, a communication loop and a common mode inductor, the differential mode inductor comprises a first sub inductor and a second sub inductor which are connected in series, the inductance of the first sub inductor and the inductance of the second sub inductor are one fourth of the inductance of the differential mode inductor, the volume of the differential mode inductor is reduced, the communication reliability is improved, the cost is reduced, the inductance of the reasonable differential mode inductor is determined according to the parameters of the communication circuit, and the reliability of the communication circuit is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a communication circuit according to an embodiment of the present application;
FIG. 2 is an equivalent simplified schematic diagram of a communication circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the transfer function of an inductive loop in an embodiment of the application;
FIG. 4 is a schematic diagram of a simulated waveform of differential mode inductance filtering in an embodiment of the application;
FIG. 5 is a schematic diagram showing structural parameters of a differential mode inductor in the prior art;
fig. 6 shows a schematic diagram of structural parameters of differential mode inductance in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The air conditioner of the present application performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
The air conditioner also comprises a communication circuit, as described in the background art, when the communication distance of the communication circuit is longer, communication error codes exist, and increasing the volume of the differential mode inductor can reduce the communication error codes, but can cause PCB typesetting difficulty and increase the cost.
The core of the inductor design is that the inductor cannot saturate when passing through the rated current. The condition for measuring inductance saturation is the inductance volume and the selection of parameters. The only index of inductance bearing energy is LI 2 。
The comparison parameters of 150mA and 400mA differential mode inductance are shown in Table 1:
TABLE 1
| Difference point | Before | After that |
| Inductance of differential mode inductor | 20mH | 40mH |
| Rated current | 150mA | 400mA |
| LI 2 | 0.45mJ | 6.4mJ |
| Magnetic core volume to be used | 16*8*5(mm) | 47*17*12(mm) |
As can be seen from Table 1, the differential mode inductance LI is provided if the same design as the original design is adopted 2 The inductance can be changed into 400mA by using the magnetic core of EI16, then EI47 is needed, and the volume is increased by more than 3 times.
The embodiment of the application proposes a communication circuit, as shown in fig. 1, comprising a master control substrate 100 and a wire controller 200, wherein the master control substrate 100 further comprises a power circuit 101, a differential mode inductor L1, a communication circuit 102 and a common mode inductor L2, wherein the positive electrode of the power circuit 101 is connected with a first end of the differential mode inductor L1, a common joint of the first end of the communication circuit 102 and the first end of the common mode inductor L2 is connected with a second end of the differential mode inductor L1, the second end of the common mode inductor L2 is connected with a first end of a first communication wire 300, the third end of the common mode inductor L2 is connected with a first end of a second communication wire 400, the second end of the communication circuit 102 and the fourth end of the common mode inductor L2 are connected with a negative electrode of the power circuit 101, the second end of the first communication wire 300 and the second end of the second communication wire 400 are respectively connected with the wire controller 200,
the differential-mode inductor L1 comprises a first sub-inductor and a second sub-inductor which are connected in series, and the inductance of the first sub-inductor and the inductance of the second sub-inductor are both one fourth of the inductance of the differential-mode inductor.
Differential mode inductance has two functions: (1) is used as a bridge for power transmission and supplies power to the whole communication circuit. (2) Is used as a high-impedance device, and the communication signal with effective resistance value is transmitted to a power supply end.
The common mode inductance can be used for filtering common mode electromagnetic interference on the signal line.
In this embodiment, the main control substrate 100 may be a main control substrate of an indoor unit, the first sub-inductor and the second sub-inductor are 2 independent sub-differential-mode inductors, the inductance is proportional to the square of the number of corresponding windings, when one differential-mode inductor has two windings, the inductance used in series is 4 times of the inductance of a single winding, therefore, the inductance of the first sub-inductor and the inductance of the second sub-inductor are equal and are all one fourth of the inductance of the differential-mode inductor, and 2 independent sub-differential-mode inductors are used to replace the original 1 differential-mode inductor, so that the volume can be reduced in multiple, and the comparison relation is shown in table 2.
TABLE 2
In order to further reduce the volume of the differential-mode inductor, in a preferred embodiment of the present application, the first sub-inductor and the second sub-inductor are patch inductors, which are also called power inductors, high-current inductors and surface-mount high-power inductors. Has the characteristics of miniaturization, high quality, high energy storage, low resistance and the like. As shown in FIG. 6, the structure parameter diagram of the differential-mode inductor in the embodiment of the application greatly reduces the volume of the differential-mode inductor, facilitates PCB typesetting and reduces the cost compared with the large inductor inserted by hand in the prior art (as shown in FIG. 5).
In order to further ensure the reliability of the communication circuit, in a preferred embodiment of the present application, the inductance of the first sub-inductor and the inductance of the second sub-inductor range from 0.6mH to 50mH.
In order to improve the efficiency of the communication circuit, in a preferred embodiment of the present application, the first communication line and the second communication line are Home buses.
In order to determine the accurate inductance of the differential-mode inductor and improve the communication reliability, in some embodiments of the present application, the inductance of the differential-mode inductor is determined according to a preset turning frequency and the impedance of the differential-mode inductor, and the impedance of the differential-mode inductor is determined according to a preset insertion loss, the impedance of the power supply loop, the total impedance of the first communication line and the second communication line, and the impedance of the communication loop.
Specifically, the insertion loss is: the ratio of the power transmitted from the source to the load without the filter being switched in and the power transmitted from the source to the load after the filter is switched in. The insertion loss is related to the network parameters of the filter network and the impedances of the source and load terminals. In a specific application scenario of the present application, as shown in fig. 2, the impedance Z of the power supply loop is determined according to a preset insertion loss I A The total impedance Z of the first communication line and the second communication line C Impedance Z of the communication loop B The impedance Z of the differential mode inductance can be determined L . The differential mode inductance will have parasitic capacitance, which is very small, and the test data is less than 100P.
Impedance Z of differential mode inductance L The preset turning frequency is f0, ω=2pi f0, so the inductance L of the differential-mode inductor can be determined according to the preset turning frequency and the impedance of the differential-mode inductor.
In order to determine the inductance of the accurate differential-mode inductor, in some embodiments of the present application, the preset insertion loss is a single-pole insertion loss, and the impedance of the differential-mode inductor is determined according to formula one, where formula one is specifically:
wherein I is the preset insertion loss, Z A Z is the impedance of the power supply loop L Z is the impedance of the differential mode inductance B Z is the impedance of the communication loop C Is the total impedance of the first communication line and the second communication line.
In a specific application scenario of the present application, the parameters are shown in table 3,
TABLE 3 Table 3
| Numbering device | Identification mark | Definition of the definition | Resistance value |
| ① | Z A | Impedance of power supply loop | 60Ω |
| ② | Z L | Differential mode inductance | To be calculated |
| ③ | Z C | Communication line | 40.8Ω |
| ④ | Z B | Internal resistance of communication loop | Impedance is 25 omega |
When the single-pole point attenuation is 20db, Z is calculated L ＝532。
In order to determine the inductance of the accurate differential-mode inductor, in some embodiments of the present application, the preset insertion loss is a bipolar point insertion loss, and the impedance of the differential-mode inductor is determined according to a formula two, where the formula two is specifically:
wherein I is the preset insertion loss, Z A Z is the impedance of the power supply loop L Z is the impedance of the differential mode inductance B Z is the impedance of the communication loop C Is the total impedance of the first communication line and the second communication line.
The field person skilled in the art can use the single-pole insertion loss or the double-pole insertion loss according to actual needs, which does not affect the protection scope of the present application.
In order to determine the accurate turning frequency, in a preferred embodiment of the present application, the preset turning frequency is determined according to a ratio of the communication frequency of the master substrate to a preset coefficient.
In a specific application scenario of the present application, when the master substrate is 1192, the communication frequency f=19.2 kHz, and the preset coefficient is 10, the preset turning frequency f0=f/10=1.92 kHz. When Z is L When=532, the inductance l=44 mH of the differential-mode inductor, and the inductance of the first sub-inductor and the second sub-inductor is 10mH. Fig. 3 is a schematic diagram of a transfer function of an inductance loop in an embodiment of the present application, and fig. 4 is a schematic diagram of a simulation waveform of differential-mode inductance filtering in an embodiment of the present application, where it is seen that an insertion loss of the differential-mode inductance meets a requirement.
It should be noted that, in consideration of practical application, the insertion loss does not have to be attenuated by 20db, and those skilled in the art can flexibly select different preset coefficients according to the insertion loss and the type of the differential mode inductor, which does not affect the protection scope of the present application. As shown in table 4, different preset coefficients K are selected.
TABLE 4 Table 4
| K | Single I | 20Log db | jwL | Total inductance (mH) | Single inductance (mH) |
| 3 | 4.61 | 13.27 | 303.338 | 14.72416 | 3.681039 |
| 3.1 | 4.91 | 13.82 | 323.078 | 16.3613 | 4.090325 |
| 3.2 | 5.22 | 14.35 | 343.476 | 18.05301 | 4.513253 |
| 3.3 | 5.54 | 14.86 | 364.532 | 19.7993 | 4.949824 |
| 3.4 | 5.87 | 15.37 | 386.246 | 21.60015 | 5.400038 |
| 3.5 | 6.21 | 15.86 | 408.618 | 23.45558 | 5.863895 |
| 3.6 | 6.56 | 16.33 | 431.648 | 25.36558 | 6.341395 |
| 3.7 | 6.92 | 16.8 | 455.336 | 27.33015 | 6.832537 |
| 3.8 | 7.29 | 17.25 | 479.682 | 29.34929 | 7.337323 |
| 3.9 | 7.67 | 17.7 | 504.686 | 31.423 | 7.855751 |
| 4 | 8.06 | 18.13 | 530.348 | 33.55129 | 8.387822 |
| 4.1 | 8.46 | 18.55 | 556.668 | 35.73414 | 8.933536 |
| 4.2 | 8.88 | 18.06 | 584.304 | 38.02614 | 9.506535 |
| 4.3 | 9.3 | 19.37 | 611.94 | 40.31814 | 10.07953 |
| 4.4 | 9.73 | 19.76 | 640.234 | 42.66471 | 10.66618 |
In order to determine accurate impedance parameters, in some embodiments of the present application, the impedance of the power circuit is determined according to the voltage of the power circuit and the current of the power circuit, the total impedance of the first communication line and the second communication line is determined according to the total length of the first communication line and the second communication line and the unit impedance corresponding to the unit length, and the impedance of the communication circuit is determined according to the voltage of the communication circuit and the current of the communication circuit.
In a specific application scenario of the application, the voltage of the power supply loop is 24V, and the current of the power supply loop is 0.4A, so that the impedance is 60 omega; 600m communication lines, the unit impedance (per 100m impedance) is 3.4 omega, there are two communication lines, so the total impedance is 40.8 omega; the communication loop voltage is 10V and current is 0.4A, so the impedance is 25 Ω.
Those skilled in the art can determine the corresponding impedance parameters according to different circuit parameters, which do not affect the protection scope of the present application.
Through the application of the technical scheme, the communication circuit comprises a main control substrate and a wire controller, the main control substrate further comprises a power supply loop, a differential mode inductor, a communication loop and a common mode inductor, the differential mode inductor comprises a first sub inductor and a second sub inductor which are connected in series, the inductance of the first sub inductor and the inductance of the second sub inductor are one fourth of the inductance of the differential mode inductor, the size of the differential mode inductor is reduced, the cost is reduced, the inductance of the reasonable differential mode inductor is determined according to the parameters of the communication circuit, and the reliability of the communication circuit is further improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The communication circuit is characterized by comprising a main control substrate and a wire controller, wherein the main control substrate comprises a power circuit, a differential mode inductor, a communication circuit and a common mode inductor, the positive electrode of the power circuit is connected with the first end of the differential mode inductor, the common joint of the first end of the communication circuit and the first end of the common mode inductor is connected with the second end of the differential mode inductor, the second end of the common mode inductor is connected with the first end of a first communication wire, the third end of the common mode inductor is connected with the first end of a second communication wire, the second end of the communication circuit and the fourth end of the common mode inductor are connected with the negative electrode of the power circuit, the second end of the first communication wire and the second end of the second communication wire are respectively connected with the wire controller,
the differential-mode inductor comprises a first sub-inductor and a second sub-inductor which are connected in series, wherein two windings are arranged on the first sub-inductor and the second sub-inductor, and the inductance of the first sub-inductor and the inductance of the second sub-inductor are one fourth of the inductance of the differential-mode inductor.
2. The communication circuit of claim 1, wherein the inductance of the differential mode inductor is determined based on a predetermined turning frequency and an impedance of the differential mode inductor, the impedance of the differential mode inductor being determined based on a predetermined insertion loss, an impedance of the power supply loop, a total impedance of the first communication line and the second communication line, and an impedance of the communication loop.
3. The communication circuit of claim 2, wherein the predetermined insertion loss is a single-pole insertion loss, and the impedance of the differential mode inductance is determined according to equation one, which is specifically:
wherein I is the preset insertion loss, ZA is the impedance of the power supply loop, ZL is the impedance of the differential mode inductor, ZB is the impedance of the communication loop, and ZC is the total impedance of the first communication line and the second communication line.
4. The communication circuit of claim 2, wherein the predetermined insertion loss is a bipolar insertion loss, and the impedance of the differential mode inductance is determined according to equation two, the equation two being:
wherein I is the preset insertion loss, Z A Z is the impedance of the power supply loop L Z is the impedance of the differential mode inductance B Z is the impedance of the communication loop C Is the total impedance of the first communication line and the second communication line.
5. The communication circuit of claim 2, wherein the predetermined turning frequency is determined according to a ratio of the communication frequency of the master substrate to a predetermined coefficient.
6. The communication circuit of claim 2, wherein the impedance of the power supply loop is determined based on a voltage of the power supply loop and a current of the power supply loop, the total impedance of the first communication line and the second communication line is determined based on a total length of the first communication line and the second communication line and a unit impedance corresponding to a unit length, and the impedance of the communication loop is determined based on the voltage of the communication loop and the current of the communication loop.
7. The communication circuit of claim 1, wherein the first sub-inductor and the second sub-inductor are chip inductors.
8. The communication circuit of claim 1, wherein the inductance of the first sub-inductor and the inductance of the second sub-inductor range from 0.6mH to 50mH.
9. The communication circuit of claim 1, wherein the first communication line and the second communication line are a Home bus.
10. An air conditioner, comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
the air conditioner further comprising a communication circuit according to any one of claims 1 to 9.
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