CN112303805A - Communication circuit and air conditioner - Google Patents
Communication circuit and air conditioner Download PDFInfo
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- CN112303805A CN112303805A CN202011121558.7A CN202011121558A CN112303805A CN 112303805 A CN112303805 A CN 112303805A CN 202011121558 A CN202011121558 A CN 202011121558A CN 112303805 A CN112303805 A CN 112303805A
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- 230000006854 communication Effects 0.000 title claims abstract description 135
- 238000004891 communication Methods 0.000 title claims abstract description 134
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000003780 insertion Methods 0.000 claims description 27
- 230000037431 insertion Effects 0.000 claims description 27
- 239000003507 refrigerant Substances 0.000 claims description 24
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- 230000001965 increasing effect Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000004804 winding Methods 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
- 238000013461 design Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
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- 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
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—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
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- 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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Abstract
The invention discloses a communication circuit and an air conditioner, wherein the communication circuit comprises a main control substrate and a line 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 size 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 longest communication distance between the indoor unit of the air conditioner and the wire controller can reach 600 m. Because of the longer communication distance, the problem of communication error codes sometimes occurs in the communication process between the indoor unit and the line controller.
The differential mode inductor is an inductor 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 problem is solved by increasing the volume of the differential mode inductor, but increasing the volume of the differential mode inductor causes difficulty in typesetting of a Printed Circuit Board (PCB), and increases the cost.
Therefore, how to provide a communication circuit that improves communication reliability without increasing the size of the differential mode inductor is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a communication circuit, which is used for solving the technical problems that in order to avoid communication error codes, the size of differential mode inductance is increased to cause difficulty in PCB typesetting and the cost is increased in the prior art.
The communication circuit comprises a main control substrate and a line controller, wherein the main control substrate further comprises a power supply loop, a differential mode inductor, a communication loop and a common mode inductor, the anode of the power supply loop is connected with the first end of the differential mode inductor, the common joint point of the first end of the communication loop 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 line, the third end of the common mode inductor is connected with the first end of a second communication line, the second end of the communication loop and the fourth end of the common mode inductor are connected with the cathode of the power supply loop, the second end of the first communication line and the second end of the second communication line are respectively connected with the line 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 predetermined transition frequency and an impedance of the differential-mode inductor, and the impedance of the differential-mode inductor is determined according to a predetermined insertion loss, an impedance of the power loop, a total impedance of the first communication line and the second communication line, and an 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 a first formula, where the first formula is specifically:
wherein I is the predetermined insertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs the total impedance of the first communication line and the second communication line.
In some embodiments of the present application, the predetermined insertion loss is a dipole insertion loss, and the impedance of the differential mode inductor is determined according to a second formula, where the second formula is specifically:
wherein I is the predetermined insertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs the total impedance of the first communication line and the second communication line.
In some embodiments of the present invention, the predetermined turning frequency is determined according to a ratio of a communication frequency of the main control substrate to a predetermined coefficient.
In some embodiments of the present application, the impedance of the power loop is determined according to a voltage of the power loop and a current of the power loop, the total impedance of the first communication line and the second communication line is determined according to 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 according to the voltage of the communication loop and the current of the communication loop.
In some embodiments of the present application, the first sub-inductor and the second sub-inductor are both patch inductors.
In some embodiments of the present application, the inductance of the first sub-inductor and the inductance of the second sub-inductor range from 0.6mH to 50 mH.
In some embodiments of the present application, the first communication line and the second communication line are Home bus.
Correspondingly, the invention also provides an air conditioner, which comprises:
the refrigerant circulation loop is used 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 low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates 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 the condenser and the evaporator;
the air conditioner also comprises the communication circuit.
By applying the technical scheme, the communication circuit comprises the main control substrate and the line 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 size of the differential mode inductor is reduced, the communication reliability is improved, the cost is reduced, the reasonable inductance of the 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 in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a communication circuit according to an embodiment of the present invention;
FIG. 2 shows an equivalent simplified schematic diagram of a communication circuit in an embodiment of the present invention;
FIG. 3 shows a schematic diagram of the transfer function of an inductive loop in an embodiment of the invention;
FIG. 4 is a diagram illustrating simulated waveforms for differential mode inductive filtering in an embodiment of the present invention;
FIG. 5 is a diagram illustrating structural parameters of a differential mode inductor in the prior art;
fig. 6 shows a schematic structural parameter diagram of the differential mode inductor in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration 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 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 can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
The air conditioner also includes a communication circuit, as mentioned in the background art, when the communication distance of the communication circuit is longer, there will be communication error, and although the volume of the increased differential mode inductance will reduce the communication error, it will cause the difficulty of PCB layout, and increase the cost.
The core of inductor design is that when rated current is passed, the inductor cannot be saturated. The condition for measuring the saturation of the inductor is the selection of the volume and parameters of the inductor. The only indicator of the inductor load energy is LI2。
Comparative parameters for 150mA and 400mA differential mode inductances, see table 1:
TABLE 1
| Difference point | Before one | After that |
| Inductance of differential mode inductor | 20mH | 40mH |
| Rated current | 150mA | 400mA |
| LI2 | 0.45mJ | 6.4mJ |
| Volume of magnetic core to be used | 16*8*5(mm) | 47*17*12(mm) |
It can be seen from Table 1 that the LI of the differential mode inductor is the same if the design is still used as the original one2The inductor can be very large, the prior inductor can use an EI16 magnetic core, and EI47 is needed after 400mA, so that the volume is increased by more than 3 times.
The embodiment of the present application provides a communication circuit, as shown in fig. 1, including main control substrate 100 and line controller 200, main control substrate 100 further includes power supply circuit 101, differential mode inductance L1, communication circuit 102 and common mode inductance L2, the positive pole of power supply circuit 101 is connected to the first end of differential mode inductance L1, the first end of communication circuit 102 and the common mode inductance L2's common junction connect the second end of differential mode inductance L1, the common mode inductance L2's second end is connected to the first end of first communication line 300, the common mode inductance L2's third end is connected to the second communication line 400's first end, the second end of communication circuit 102 and the common mode inductance L2's fourth end are connected to the negative pole of power supply circuit 101, the second end of first communication line 300 and the second end of second communication line 400 are connected to line controller 200 respectively,
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.
The differential mode inductance has two functions: the bridge is used as a transmission bridge of a power supply and supplies power to the whole communication circuit. And secondly, the resistor is used as a high-impedance device, and effective communication signals of the resistance are transmitted to a power supply end.
The common mode inductor 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 value is proportional to the square of the number of turns of the corresponding winding, and when one differential-mode inductor has two windings, the inductance value used in series is 4 times that of a single winding, so that the inductance value of the first sub-inductor is equal to that of the second sub-inductor, which is one fourth of that of the differential-mode inductor, and the 2 independent sub-differential-mode inductors are used to replace the original 1 differential-mode inductor, so that the volume can be reduced by times, and the comparison relationship is shown in table 2.
TABLE 2
In order to further reduce the size of the differential-mode inductor, in a preferred embodiment of the present application, the first sub-inductor and the second sub-inductor are both patch inductors, which are also called power inductors, large-current inductors, and surface-mounted high-power inductors. Has the characteristics of miniaturization, high quality, high energy storage, low resistance and the like. Fig. 6 is a schematic diagram showing structural parameters of the differential mode inductor in the embodiment of the present invention, and compared with the large inductor (as shown in fig. 5) inserted by hand in the prior art, the differential mode inductor has the advantages that the size of the differential mode inductor is greatly reduced, the PCB layout is facilitated, and the cost is reduced.
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 are in a range of 0.6mH to 50 mH.
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 bus.
In order to determine an accurate inductance of the differential mode inductor and improve communication reliability, in some embodiments of the present invention, the inductance of the differential mode inductor is determined according to a predetermined transition frequency and an impedance of the differential mode inductor, and the impedance of the differential mode inductor is determined according to a predetermined insertion loss, an impedance of the power loop, a total impedance of the first communication line and the second communication line, and an impedance of the communication loop.
Specifically, the insertion loss is: the ratio of the power transferred from the interferer to the load without the access filter to the power transferred from the interferer to the load after the access filter. 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 the predetermined insertion loss IAA total impedance Z of the first communication line and the second communication lineCImpedance Z of the communication loopBThe impedance Z of the differential mode inductance can be determinedL. Generally, the differential mode inductance has parasitic capacitance which is very small, and test data is less than 100P.
Impedance Z of differential mode inductorLThe preset turning frequency is f0, and ω is 2 π f0, so that 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 accurate inductance of the differential-mode inductor, 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 a first formula, which is specifically:
wherein I is the presetInsertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs 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
| Numbering | Identification | Definition of | Resistance value |
| ① | ZA | Impedance of power supply loop | 60Ω |
| ② | ZL | Differential mode inductor | To be calculated |
| ③ | ZC | Communication line | 40.8Ω |
| ④ | ZB | Communication loopInternal resistance of | Impedance of 25 omega |
When the attenuation of the single pole point is 20db, Z is calculatedL＝532。
In order to determine an accurate inductance of the differential-mode inductor, in some embodiments of the present application, the predetermined insertion loss is a double-pole insertion loss, and the impedance of the differential-mode inductor is determined according to a second formula, where the second formula specifically is:
wherein I is the predetermined insertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs the total impedance of the first communication line and the second communication line.
The skilled person can use the unipolar insertion loss or the bipolar insertion loss according to actual needs, which does not affect the scope of protection of the present application.
In order to determine an accurate turning frequency, in a preferred embodiment of the present invention, the preset turning frequency is determined according to a ratio of the communication frequency of the main control substrate to a preset coefficient.
In a specific application scenario of the present application, when the main control substrate is 1192, the communication frequency f is 19.2kHz, and the preset coefficient is 10, the preset turning frequency f0 is f/10 is 1.92 kHz. When Z isLWhen the inductance L of the differential-mode inductor is 532 mH, the inductance of the first sub-inductor and the inductance of the second sub-inductor are 10 mH. Fig. 3 is a schematic diagram of a transfer function of an inductance loop in an embodiment of the present invention, and fig. 4 is a schematic diagram of a simulated waveform of a differential mode inductance filter in an embodiment of the present invention.
It should be noted that, considering practical applications, the insertion loss does not have to be according to the attenuation of 20db, and those skilled in the art can flexibly select different preset coefficients according to the types of the insertion loss and the differential mode inductance, which does not affect the protection scope of the present application. As shown in table 4, different preset coefficients K were selected.
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 an accurate impedance parameter, in some embodiments of the present application, the impedance of the power loop is determined according to a voltage of the power loop and a current of the power loop, a total impedance of the first communication line and the second communication line is determined according to 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 according to the voltage of the communication loop and the current of the communication loop.
In a specific application scenario of the present 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 Ω; 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 the current is 0.4A, so the impedance is 25 omega.
The skilled person can determine the corresponding impedance parameter according to different circuit parameters, which does not affect the scope of protection of the present application.
By applying the technical scheme, the communication circuit comprises the main control substrate and the line controller, the main control substrate further comprises a power supply circuit, a differential mode inductor, a communication circuit 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 size of the differential mode inductor is reduced, the cost is reduced, the reasonable inductance of the 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 used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A communication circuit is characterized by comprising a main control substrate and a line controller, wherein the main control substrate comprises a power supply loop, a differential mode inductor, a communication loop and a common mode inductor, the positive pole of the power supply loop is connected with the first end of the differential mode inductor, the common junction point of the first end of the communication loop 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 line, the third end of the common mode inductor is connected with the first end of a second communication line, the second end of the communication loop and the fourth end of the common mode inductor are connected with the negative pole of the power supply loop, the second end of the first communication line and the second end of the second communication line are respectively connected with the line 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.
2. The communication circuit of claim 1, wherein the inductance of the differential-mode inductor is determined according to a predetermined transition frequency and an impedance of the differential-mode inductor, and wherein the impedance of the differential-mode inductor is determined according to a predetermined insertion loss, an impedance of the power loop, a total impedance of the first and second communication lines, 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 inductor is determined according to a first equation, the first equation being specifically:
wherein I is the predetermined insertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs 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 double pole insertion loss, and the impedance of the differential-mode inductor is determined according to equation two, which is specifically:
wherein I is the predetermined insertion loss, ZAIs the impedance of the power supply loop, ZLIs the impedance of the differential mode inductor, ZBIs the impedance of the communication loop, ZCIs 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 main control substrate to a predetermined coefficient.
6. The communication circuit of claim 2, wherein the impedance of the power loop is determined according to a voltage of the power loop and a current of the power loop, a total impedance of the first communication line and the second communication line is determined according to 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 according to 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 both patch 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 50 mH.
9. The communication circuit of claim 1, wherein the first communication line and the second communication line are a Home bus (Home bus).
10. An air conditioner comprising:
the refrigerant circulation loop is used 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 low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates 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 the condenser and the evaporator;
characterized in that the air conditioner further comprises a communication circuit according to any one of claims 1 to 9.
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