CN220852495U - Current loop communication circuit and air conditioner - Google Patents
Current loop communication circuit and air conditioner Download PDFInfo
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- CN220852495U CN220852495U CN202322336318.4U CN202322336318U CN220852495U CN 220852495 U CN220852495 U CN 220852495U CN 202322336318 U CN202322336318 U CN 202322336318U CN 220852495 U CN220852495 U CN 220852495U
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Abstract
The application provides a current loop communication circuit and an air conditioner, which comprise a current loop communication module and an electromagnetic compatibility module, wherein the current loop communication module is provided with a communication connecting wire and an alternating current power supply connecting wire, and the communication connecting wire or the alternating current power supply connecting wire is used for being connected to a switching power supply; the electromagnetic compatibility module is arranged on at least one of the communication connection line and the alternating current power supply connection line and is used for filtering interference on the current loop communication circuit. According to the embodiment of the application, the electromagnetic compatibility module is additionally arranged on the communication connecting wire and/or the alternating current power supply connecting wire of the current loop communication module, so that the interference on the communication connecting wire and/or the alternating current power supply connecting wire can be filtered, the interference existing in a switching power supply mode is reduced, the EMC capability of the current loop communication circuit is further enhanced, and the current loop communication circuit meets the EMC test requirement.
Description
Technical Field
The present application relates to the field of electronic circuits, and in particular, to a current loop communication circuit and an air conditioner.
Background
In the related art, for the existing air conditioner, communication between the indoor unit and the outdoor unit is generally implemented using a current loop communication circuit. For the current loop communication circuit, a resistor or resistor-capacitor voltage division is basically adopted for power-taking communication, but the mode has the problems of large resistance loss, low efficiency, serious heat generation, large occupied area and the like. In order to solve the above-mentioned problems, a power supply communication method of a switching power supply is commercially available, but the power supply method of the switching power supply is interfered, which may cause difficulty in passing EMC (Electromagnetic Compatibility ) test.
Disclosure of utility model
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a current loop communication circuit and an air conditioner, and aims to enhance EMC capability of the current loop communication circuit.
In a first aspect, an embodiment of the present application provides a current loop communication circuit, including:
The current loop communication module is provided with a communication connection wire and an alternating current power supply connection wire, wherein the communication connection wire or the alternating current power supply connection wire is used for being connected to a switching power supply;
And the electromagnetic compatibility module is arranged on at least one of the communication connecting wire and the alternating current power supply connecting wire and is used for filtering interference on the current loop communication circuit.
According to some embodiments of the application, the electromagnetic compatibility module comprises a common mode inductance comprising a first coil and a second coil, the first coil being arranged on the communication connection line, the second coil being arranged on the ac power connection line.
According to some embodiments of the application, the first coil and the second coil are wound on the same iron core, the number of turns of the first coil and the second coil are equal, the diameters of wires of the first coil and the second coil are equal, and the winding directions of the first coil and the second coil are opposite.
According to some embodiments of the application, the electromagnetic compatibility module comprises a differential mode inductance comprising a third coil, the third coil being arranged at the communication connection line or the ac power connection line.
According to some embodiments of the application, the electromagnetic compatibility module further comprises a capacitance module, one end of the capacitance module is connected to the communication connection line, and the other end is connected to the ac power connection line.
According to some embodiments of the application, the capacitive module comprises at least one of:
A first capacitor having one end connected to a front end of the first coil and the other end connected to a front end of the second coil;
And one end of the second capacitor is connected to the rear end of the first coil, and the other end of the second capacitor is connected to the rear end of the second coil.
According to some embodiments of the application, the electromagnetic compatibility module further comprises an interference filtering module, one end of the interference filtering module is used for being connected to a switching power supply or a ground terminal, and the other end of the interference filtering module is connected to the communication connection line or the alternating current power supply connection line.
According to some embodiments of the application, the interference filtering module comprises at least one of:
The first interference filtering device is provided with one end which is used for being connected to the output end of the switching power supply, and the other end which is connected to the communication connecting wire or the alternating current power supply connecting wire;
And one end of the second interference filtering device is used for being connected to the grounding end, and the other end of the second interference filtering device is connected to the communication connecting wire or the alternating current power supply connecting wire.
According to some embodiments of the application, the first and second interference filtering devices are inductors or resistors.
According to some embodiments of the application, the interference filtering module further includes a third capacitor, where the third capacitor is disposed on the communication connection line or the ac power connection line, and one end of the third capacitor is used to be connected to an output terminal of the switching power supply, and the other end is used to be connected to a ground terminal.
In a second aspect, an embodiment of the present application provides an air conditioner, including the current loop communication circuit of the first aspect.
According to the technical scheme provided by the embodiment of the application, the technical effects include but are not limited to the following: the current loop communication circuit comprises a current loop communication module and an electromagnetic compatibility module, wherein the current loop communication module is provided with a communication connecting wire and an alternating current power supply connecting wire, and the communication connecting wire or the alternating current power supply connecting wire is used for being connected to a switching power supply; the electromagnetic compatibility module is arranged on at least one of the communication connection line and the alternating current power supply connection line and is used for filtering interference on the current loop communication circuit. According to the embodiment of the application, the electromagnetic compatibility module is additionally arranged on the communication connecting wire and/or the alternating current power supply connecting wire of the current loop communication module, so that the interference on the communication connecting wire and/or the alternating current power supply connecting wire can be filtered, the interference existing in a switching power supply mode is reduced, the EMC capability of the current loop communication circuit is further enhanced, and the current loop communication circuit meets the EMC test requirement.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a schematic diagram of a current loop communication circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a current loop communication circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a current loop communication circuit according to another embodiment of the present application;
fig. 4 is a schematic diagram of a current loop communication circuit according to another embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
In the description of the present application, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In some cases, for the existing air conditioner, communication between the indoor unit and the outdoor unit is generally implemented by using a current loop communication circuit. For the current loop communication circuit, a resistor or resistor-capacitor voltage division is basically adopted for power-taking communication, but the mode has the problems of large resistance loss, low efficiency, serious heat generation, large occupied area and the like. In order to solve the above-mentioned problems, a power supply communication method of switching power supply is commercially available, but the power supply method of switching power supply is interfered, which causes difficulty in passing EMC test.
Based on the above situation, the embodiment of the application provides a current loop communication circuit and an air conditioner, which aim to reduce the interference existing in a power supply mode of a switching power supply, further enhance the EMC capability of the current loop communication circuit and enable the current loop communication circuit to meet EMC test requirements.
Various embodiments of the current loop communication circuit of the present application are further described below with reference to the accompanying drawings.
As shown in fig. 1 to 4, fig. 1 to 4 are schematic structural diagrams of a current loop communication circuit according to various embodiments of the present application.
Specifically, the current loop communication circuit of the embodiment of the present application includes, but is not limited to, a current loop communication module 100 and an electromagnetic compatibility module 200, wherein the current loop communication module 100 is provided with an ac power connection line 120 and a communication connection line 110, and a switching power supply is connected to the ac power connection line 120 or the communication connection line 110; the electromagnetic compatibility module 200 is disposed on at least one of the communication connection line 110 and the ac power connection line 120, and the electromagnetic compatibility module 200 is capable of filtering electromagnetic interference on the current loop communication circuit.
Because the electromagnetic compatibility module 200 is additionally arranged on the communication connection line 110 and/or the alternating current power supply connection line 120 of the current loop communication module 100, the embodiment of the application can filter the interference on the communication connection line 110 and/or the alternating current power supply connection line 120, reduce the interference existing in a switching power supply mode, and further enhance the EMC capability of the current loop communication circuit, so that the current loop communication circuit meets the EMC test requirement.
It should be noted that, regarding the current loop communication module 100 in the air conditioner, it often includes an indoor unit current loop communication module and an outdoor unit current loop communication module (only the indoor unit current loop communication module is shown in fig. 1 to 4), where the indoor unit current loop communication module is connected to the outdoor unit current loop communication module through the ac power connection line 120 and the communication connection line 110 to form a current loop communication circuit; then, the indoor unit control unit and the outdoor unit control unit realize communication through the current loop communication circuit so as to realize normal communication of the indoor unit and the outdoor unit and realize control and state information transmission and reception between the indoor unit and the outdoor unit; in addition, the switching power supply may be connected in series to the ac power connection line 120 or the communication connection line 110 to output dc power to the current loop communication circuit.
The switching power supply may be installed on the indoor side or the outdoor side, and the embodiment of the present application is not particularly limited.
In addition, it should be noted that, in the embodiment of the present application, the switching power supply may be connected in series to N line or L line of the ac power supply, or may be connected in series to the communication connection line 110, because the indoor unit current loop communication module and the outdoor unit current loop communication module are connected to form a current loop communication circuit through the communication connection line 110 and the ac power supply connection line 120, such as L line or N line, and the switching power supply is used to provide dc power for the current loop communication circuit, so that normal operation of the current loop communication loop can be achieved regardless of whether the switching power supply is connected in series to the communication connection line 110 or connected in series to the ac power supply connection line 120, such as L line or N line.
It is noted that, in the embodiment of the present application, by setting a switching power supply and connecting the switching power supply in series to the communication connection line 110 or the ac power supply connection line 120, to output dc to the current loop communication module 100, the embodiment of the present application replaces the existing resistor voltage division type dc power supply circuit with dc output by the switching power supply, and is compatible with the connection line between the indoor unit and the outdoor unit of the air conditioner by the existing current loop communication circuit, thereby solving the problem that the existing resistor voltage division circuit has serious heat due to large voltage division resistance power consumption, and simultaneously solving the problem that the existing voltage division resistance has large volume and is not beneficial to circuit board wiring.
It should be noted that, for the switching power supply, for example, as shown in fig. 1 to 4, the switching power supply located at the indoor unit side is connected in series to an ac power supply N line, and can output dc power to provide dc power for the current loop communication circuit, specifically, the switching power supply may output multiple paths of dc power, where an independent winding, i.e., a first winding, of a switching transformer of the switching power supply outputs first dc power to the current loop communication circuit to provide dc power, as shown in the figure, the switching power supply outputs independent +24v dc power to provide dc power for the current loop communication circuit, an anode of the output terminal is connected with an ac power supply N line, and a cathode of the output terminal is connected with an indoor unit current loop communication module. The 24V positive pole is input to the current loop communication circuit from the indoor machine side N line, the direct current returns to the 24V negative pole of the direct current through the outdoor machine and the indoor machine, the 24V negative pole is connected with the output end of the indoor machine current loop communication module, and the 24V negative pole is also the public ground wire output by the current loop communication module 100. The switching power supply is used for providing +24V, other windings of the switching transformer also output other direct currents, for example, a second winding of the switching transformer outputs second direct current +5V, and a direct current negative electrode of the switching power supply is shared with a negative electrode of 24V to provide a direct current power supply required by the work of the indoor control unit. The switching power supply can also output other direct currents to provide other working direct currents for the whole outdoor circuit, namely the switching power supply provides direct currents for the whole outdoor circuit, compared with the existing outdoor circuit switching power supply, the switching transformer of the switching power supply provided by the embodiment of the application is added with a winding to output a group of independent direct currents to provide direct current for the current loop communication circuit, compared with the direct current power supply of the existing current loop communication circuit, the direct current power supply of the existing current loop communication circuit is realized by simply voltage-dividing through the voltage-dividing resistor and diode rectification and then through the voltage-stabilizing diode, the voltage-dividing resistor with serious heat due to excessive power consumption is omitted, meanwhile, the winding output is only expanded on the existing switching power supply, and the wiring of the circuit board is very simple and has no large-size element.
In addition, as shown in fig. 1 to 4, the current loop communication module 100 includes, but is not limited to, an optocoupler IC250, an optocoupler IC251 and a triode Q250, wherein the optocoupler IC250 is responsible for communication reception of an indoor portion of the current loop communication circuit, one end of a phototransistor is connected to a signal receiving pin RXD of the indoor unit control unit, one end of a light emitting diode is an input end of the indoor unit current loop communication module, communication of the indoor portion is input from the input end, and then output from one end of the phototransistor to the indoor unit control unit, so that the indoor unit control unit reads communication reception data; the optocoupler IC251 is responsible for communication transmission of the indoor part of the current loop communication circuit, one end of a light emitting diode of the optocoupler IC251 is connected to a signal transmission pin TXD of the indoor unit control unit through a collector electrode of a triode Q250, a base electrode of the triode Q250 is connected to a signal transmission pin TXD of the indoor unit control unit, a communication signal transmitted by the indoor unit control unit is transmitted to one end of the light emitting diode of the optocoupler IC251 after being driven by the triode Q250, and one end of a phototriode is an output end of the indoor unit current loop communication module, so that the communication signal transmitted by the indoor unit control unit is output from the output end.
Note that, regarding the electromagnetic compatibility module 200, the common-mode inductance PL1, the differential-mode inductance PL2, the capacitance module, or a partial combination of the above components may be used, and the configuration of the electromagnetic compatibility module 200 is not particularly limited in the embodiment of the present application.
In an embodiment, as shown in fig. 1 to 4, the electromagnetic compatibility module 200 includes, but is not limited to, a common-mode inductance PL1, wherein the common-mode inductance PL1 includes, but is not limited to, a first coil and a second coil, and the first coil is disposed on the communication connection line 110, and the second coil is disposed on the ac power connection line 120.
The arrangement of the first coil and the second coil in the common-mode inductance PL1 may be as follows: the first coil and the second coil are both wound on the same iron core, the number of turns of the first coil is equal to that of the second coil, the wire diameter of the first coil is equal to that of the second coil, and in addition, the winding directions of the first coil and the second coil are opposite.
The common mode inductor PL1 is also called a common mode choke coil, and can play a role of EMI filtering, and is used for inhibiting electromagnetic waves generated by the high-speed signal line from radiating outwards.
In addition, when the normal current in the circuit flows through the common-mode inductor PL1, the currents generate reverse magnetic fields in the inductor coils wound in the same phase to cancel each other, and at this time, the normal signal current is mainly affected by the coil resistance; when common mode current flows through the coil, due to the isotropy of the common mode current, a magnetic field in the same direction is generated in the coil to increase the inductance of the coil, so that the coil presents high impedance, a stronger damping effect is generated, and the common mode current is attenuated, thereby achieving the purpose of filtering.
For example, as shown in fig. 1, the common-mode inductor PL1 in the embodiment of the present application can implement common-mode interference filtering on the communication connection line 110 and the ac power supply N line, and implement zero blocking on the communication signal of the differential mode. Therefore, the problem that common mode interference is generated on products by current loop communication powered by the switching power supply is solved.
It should be noted that, in addition to the common-mode inductance PL1 shown in fig. 1, the differential-mode inductance PL2 and/or the capacitance module may be added as shown in fig. 2 to 4.
In an embodiment, as shown in fig. 2 to 3, the electromagnetic compatibility module 200 includes a differential mode inductance PL2, and the differential mode inductance PL2 includes a third coil, where the third coil is disposed on the communication connection line 110 or the ac power connection line 120.
For example, as shown in fig. 2, the common-mode inductor PL1 and the differential-mode inductor PL2 may be simultaneously configured, so as to manufacture a combination of a common mode and a differential mode, for example, the number of turns of the coil in the communication connection line 110 is N, the number of turns of the coil in the ac power N line is n+x, x is a natural number greater than 1, that is, the number of turns of the first coil and the second coil is N, and the number of turns of the coil in the third coil is x, so that common-mode filtering and differential-mode filtering can be implemented in the circuit.
It should be noted that, in the embodiment of the present application, as shown in fig. 2 and 3, in addition to adding the differential-mode inductance PL2 on the basis of the common-mode inductance PL1, only the differential-mode inductance PL2 may be set, and the common-mode inductance PL1 may not be set, so that only differential-mode filtering is implemented.
In one embodiment, as shown in fig. 3 to 4, the electromagnetic compatibility module 200 further includes a capacitor module, where one end of the capacitor module is connected to the communication connection line 110 and the other end of the capacitor module is connected to the ac power connection line 120.
It should be noted that, regarding the structural form of the above-mentioned capacitor module, the following three types are included:
The first structural form: the capacitor module includes a first capacitor C1, and one end of the first capacitor C1 is connected to the front end of the first coil, and the other end is connected to the front end of the second coil.
The second structural form: the capacitor module includes a second capacitor C2, and one end of the second capacitor C2 is connected to the rear end of the first coil, and the other end is connected to the rear end of the second coil.
The third structural form: the capacitor module comprises a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected to the front end of the first coil, and the other end of the first capacitor C1 is connected to the front end of the second coil; in addition, one end of the second capacitor C2 is connected to the rear end of the first coil, and the other end is connected to the rear end of the second coil.
For example, as shown in fig. 3 to 4, the differential mode interference is filtered by adding capacitance to both the front end and the rear end of the common mode inductor PL 1. Further, a capacitor may be added only to the front end of the common-mode inductor PL1, or a capacitor may be added only to the rear end of the common-mode inductor PL 1.
In an embodiment, as shown in fig. 1 to 4, the electromagnetic compatibility module 200 further includes an interference filtering module 210, where one end of the interference filtering module 210 is used to be connected to a switching power supply or a ground terminal, and the other end is connected to the communication connection line 110 or the ac power connection line 120.
It should be noted that, regarding the structural form of the interference filtering module 210, the following three types of structures are included:
The first structural form: the interference filtering module 210 includes a first interference filtering device, and one end of the first interference filtering device is connected to an output terminal of the switching power supply, and the other end is connected to the communication connection line 110 or the ac power connection line 120.
The second structural form: the interference filtering module 210 includes a second interference filtering device, and one end of the second interference filtering device is connected to the ground, and the other end is connected to the communication connection line 110 or the ac power connection line 120.
The third structural form: the interference filtering module 210 includes a first interference filtering device and a second interference filtering device, and one end of the first interference filtering device is connected to the output end of the switching power supply, and the other end is connected to the communication connection line 110 or the ac power supply connection line 120; the second interference filtering device has one end connected to the ground and the other end connected to the communication connection line 110 or the ac power connection line 120.
It should be noted that, regarding the first interference filtering device and the second interference filtering device, the first interference filtering device and the second interference filtering device may be inductors or resistors, which are not particularly limited in the embodiment of the present application.
For example, as shown in fig. 1 to 4, a first interference filtering device (inductance L4) and a second interference filtering device (inductance L3) may be simultaneously provided, which function to filter interference generated by the switching power supply to the circuit and the product. In addition, only the inductor L3, only the inductor L4, or neither the inductor L3 nor the inductor L4 may be provided.
In an embodiment, as shown in fig. 1 to 4, the interference filtering module 210 further includes a third capacitor C254, where the third capacitor C254 is disposed on the communication connection line 110 or the ac power connection line 120, and one end of the third capacitor C254 is used for being connected to an output terminal of the switching power supply, and the other end is used for being connected to a ground terminal.
Based on the current loop communication circuit, common mode and differential mode interference of the current loop communication current to an input line, a power grid or other circuits of a product can be reduced, and meanwhile, the interference to the current loop communication circuit caused by the input line, the power grid or other circuits of the product is enhanced, namely, the EMC capability of the current loop circuit is enhanced.
Based on the current loop communication circuit of each of the above embodiments, each of the embodiments of the air conditioner of the present application is set forth below.
An embodiment of the present application further provides an air conditioner, including the current loop communication circuit of any one of the above embodiments.
It should be noted that, since the air conditioner according to the embodiment of the present application includes the current loop communication circuit according to any one of the embodiments described above, reference may be made to the specific implementation and technical effects of the current loop communication circuit according to any one of the embodiments described above.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present application, and these equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (11)
1. A current loop communication circuit, comprising:
The current loop communication module is provided with a communication connection wire and an alternating current power supply connection wire, wherein the communication connection wire or the alternating current power supply connection wire is used for being connected to a switching power supply;
And the electromagnetic compatibility module is arranged on at least one of the communication connecting wire and the alternating current power supply connecting wire and is used for filtering interference on the current loop communication circuit.
2. The current loop communication circuit of claim 1, wherein the electromagnetic compatibility module comprises a common mode inductance comprising a first coil disposed on the communication connection line and a second coil disposed on the ac power connection line.
3. The current loop communication circuit of claim 2, wherein the first coil and the second coil are wound on the same core, the number of turns of the first coil and the second coil are equal, the wire diameters of the first coil and the second coil are equal, and the winding directions of the first coil and the second coil are opposite.
4. The current loop communication circuit according to claim 1 or 2, wherein the electromagnetic compatibility module comprises a differential mode inductance comprising a third coil, the third coil being provided to the communication connection line or the ac power supply connection line.
5. The current loop communication circuit of claim 2, wherein the electromagnetic compatibility module further comprises a capacitance module having one end connected to the communication connection line and the other end connected to the ac power connection line.
6. The current loop communication circuit of claim 5, wherein the capacitive module comprises at least one of:
A first capacitor having one end connected to a front end of the first coil and the other end connected to a front end of the second coil;
And one end of the second capacitor is connected to the rear end of the first coil, and the other end of the second capacitor is connected to the rear end of the second coil.
7. The current loop communication circuit of claim 2, wherein the electromagnetic compatibility module further comprises an interference filtering module, one end of the interference filtering module is used for being connected to a switching power supply or a ground terminal, and the other end of the interference filtering module is connected to the communication connection line or the ac power connection line.
8. The current loop communication circuit of claim 7, wherein the interference filtering module comprises at least one of:
The first interference filtering device is provided with one end which is used for being connected to the output end of the switching power supply, and the other end which is connected to the communication connecting wire or the alternating current power supply connecting wire;
And one end of the second interference filtering device is used for being connected to the grounding end, and the other end of the second interference filtering device is connected to the communication connecting wire or the alternating current power supply connecting wire.
9. The current loop communication circuit of claim 8, wherein the first and second interference filtering devices are inductors or resistors.
10. The current loop communication circuit of claim 7, wherein the interference filtering module further comprises a third capacitor, the third capacitor is disposed on the communication connection line or the ac power connection line, one end of the third capacitor is used for being connected to an output terminal of the switching power supply, and the other end is used for being connected to a ground terminal.
11. An air conditioner comprising the current loop communication circuit according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322336318.4U CN220852495U (en) | 2023-08-29 | 2023-08-29 | Current loop communication circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322336318.4U CN220852495U (en) | 2023-08-29 | 2023-08-29 | Current loop communication circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220852495U true CN220852495U (en) | 2024-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322336318.4U Active CN220852495U (en) | 2023-08-29 | 2023-08-29 | Current loop communication circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220852495U (en) |
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2023
- 2023-08-29 CN CN202322336318.4U patent/CN220852495U/en active Active
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