Power line communication isolator, communication equipment and power line communication isolation method

Abstract

The invention relates to the technical field of communication, and provides a power line communication isolator, communication equipment and a power line communication isolation method, and the power line communication isolator comprises a first isolation module, an anti-phase module and a second isolation module. The anti-phase module comprises a first coupling circuit, a transformer and a second coupling circuit which are connected in sequence; the first output end of the first isolation module is in communication connection with the input end of the second isolation module through a power line; the second output end of the first isolation module is in communication connection with the input end of the first coupling circuit, and the output end of the first coupling circuit is connected with the primary side coil of the transformer; the input end of the second coupling circuit is connected with the secondary side coil of the transformer, and the output end of the second coupling circuit is in communication connection with the input end of the second isolation module. According to the invention, the defect that the noise signal still can influence the stability of a PLC communication network due to the fact that the noise signal is low in attenuation of the isolator in the prior art can be overcome.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a power line communication isolator, communication equipment and a power line communication isolation method. Background Art

[0002] With the rapid development of Internet of Things technology, Power Line Carrier (PLC), as a technology that uses existing power lines for data transmission, has been widely used in smart homes, industrial automation, energy management and other fields. PLC communication avoids the high cost of laying out communication lines separately, allowing devices to communicate efficiently. However, due to the presence of various noise sources in the power line environment, such as high-power electrical appliances and external electromagnetic interference, the stability and reliability of PLC communication face severe challenges. The noise signal is mixed with the main signal of the power line, resulting in communication packet loss, delay, and even network disconnection.

[0003] Existing power line communication isolators mostly use traditional differential mode and common mode isolation methods. Although they can suppress noise signals to a certain extent, their isolation effect is still not ideal, especially under the influence of high-power electrical equipment and external electromagnetic interference. The existing power line communication isolators have little attenuation on noise signals, resulting in noise signals still being able to affect the stability of the PLC communication network. Summary of the invention

[0004] The present invention provides a power line communication isolator, a communication device and a power line communication isolation method, which are used to solve the defect in the prior art that the power line communication isolator has a small attenuation on the noise signal, resulting in that the noise signal can still affect the stability of the PLC communication network.

[0005] The present invention provides a power line communication isolator, comprising a first isolation module, an inverting module and a second isolation module; the inverting module comprises a first coupling circuit, a transformer and a second coupling circuit connected in sequence; The first output end of the first isolation module is connected to the input end of the second isolation module via power line communication; The second output end of the first isolation module is communicatively connected to the input end of the first coupling circuit, and the output end of the first coupling circuit is connected to the primary coil of the transformer; The input end of the second coupling circuit is connected to the secondary coil of the transformer, and the output end of the second coupling circuit is communicatively connected to the input end of the second isolation module.

[0006] A power line communication isolator provided according to the present invention comprises: The first output end of the first isolation module and the output end of the second coupling circuit are both communicatively connected to the intersection of the power lines, and the input end of the second isolation module is communicatively connected to the intersection.

[0007] According to a power line communication isolator provided by the present invention, the first coupling circuit and the second coupling circuit both include coupling capacitors.

[0008] According to a power line communication isolator provided by the present invention, the number of turns of the primary coil of the transformer is the same as the number of turns of the secondary coil of the transformer; The transformer is used to receive a noise signal through a primary coil and output an anti-phase noise signal through the secondary coil.

[0009] According to a power line communication isolator provided by the present invention, the anti-phase noise signal and the noise signal have the same amplitude and a phase difference of 180°.

[0010] According to a power line communication isolator provided by the present invention, the first isolation module includes a first differential mode component and a first common mode component; The output end of the first differential mode component is communicatively connected to the input end of the first common mode component; The first output end of the first common mode component is communicatively connected to the junction of the power lines, and the second output end of the first common mode component is communicatively connected to the input end of the first coupling circuit.

[0011] According to a power line communication isolator provided by the present invention, the second isolation module includes a second differential mode component and a second common mode component; An input end of the second common mode component is communicatively connected to a junction of the power lines, and an output end of the second common mode component is communicatively connected to an input end of the second differential mode component.

[0012] The present invention also provides a communication device, wherein the communication device comprises the power line communication isolator described in any one of the above items.

[0013] The present invention also provides a power line communication isolation method, which is applied to the power line communication isolator as described above, and the method comprises: The signal output from the second output end of the first isolation module is collected by the first coupling circuit of the inverting module to obtain a noise signal; the first output end of the first isolation module is connected to the input end of the second isolation module through power line communication; The noise signal is input to the primary coil of the transformer of the inverting module, and the inverted noise signal output by the secondary coil of the transformer of the inverting module is output to the second coupling circuit of the inverting module; the transformer is used to perform inverting processing on the noise signal to obtain an inverted noise signal; The inverted noise signal is coupled to the input end of the second isolation module through the second coupling circuit of the inverting module.

[0014] According to a power line communication isolation method provided by the present invention, the first output end of the first isolation module and the input end of the second isolation module are both communicatively connected to the intersection of the power lines, and the method further includes: coupling the inverted noise signal to the intersection of the power lines through the second coupling circuit of the inverting module; Sending the noise signal to the intersection of the power lines through the first output terminal of the first isolation module; The anti-phase noise signal is used to perform anti-phase attenuation with the noise signal at the intersection of the power lines.

[0015] The power line communication isolator provided by the present invention comprises a first isolation module, an inverting module and a second isolation module; the inverting module comprises a first coupling circuit, a transformer and a second coupling circuit connected in sequence; the first output end of the first isolation module is connected to the input end of the second isolation module through power line communication; the second output end of the first isolation module is communicatively connected to the input end of the first coupling circuit, and the output end of the first coupling circuit is connected to the primary coil of the transformer; the input end of the second coupling circuit is connected to the secondary coil of the transformer, and the output end of the second coupling circuit is communicatively connected to the input end of the second isolation module. The power line communication isolator of the present invention introduces an inverting module, which is connected to the second output end of the first isolation module through a first coupling circuit to accurately collect noise signals. The collected noise signals pass through the primary coil of the transformer. According to the characteristics of the transformer itself, the secondary coil of the transformer can output an inverted noise signal with a phase opposite to that of the noise signal, and then the inverted noise signal is coupled to the power line through the second coupling circuit. When the inverted noise signal is superimposed on the original noise signal in the power line, since the two have opposite phases, they will cancel each other out on the power line, thereby achieving the effect of reducing the noise intensity; the first isolation module and the second isolation module are used to perform differential mode isolation and common mode isolation on the noise signal; through multi-level isolation and inverting processing, the noise signal in the power line can be accurately attenuated without affecting the carrier communication signal, thereby improving the stability and reliability of the PLC communication network. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of the power line communication isolator provided by the present invention.

[0018] Figure 2 This is the second structural schematic diagram of the power line communication isolator provided by the present invention.

[0019] Figure 3 This is the third structural schematic diagram of the power line communication isolator provided by the present invention.

[0020] Figure 4 It is a flow chart of the power line communication isolation method provided by the present invention.

[0021] Reference numerals: 10: first isolation module; 20: second isolation module; 30: inverting module; 110: first differential mode component; 120: first common mode component; 210: second differential mode component; 220: second common mode component; 310: first coupling circuit; 320: transformer; 330: second coupling circuit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction. In addition, the term "plurality" means including two or more.

[0027] Reference Figure 1 , Figure 1 is one of the structural schematic diagrams of the power line communication isolator provided by the present invention, such as Figure 1 As shown, the power line communication isolator includes a first isolation module 10, an inverting module 30 and a second isolation module 20; the inverting module 30 includes a first coupling circuit 310, a transformer 320 and a second coupling circuit 330 connected in sequence; the first output end of the first isolation module 10 is connected to the input end of the second isolation module 20 via power line communication.

[0028] The second output end of the first isolation module 10 is communicatively connected to the input end of the first coupling circuit 310 , and the output end of the first coupling circuit 310 is connected to the primary coil of the transformer 320 .

[0029] An input end of the second coupling circuit 330 is connected to the secondary coil of the transformer 320 , and an output end of the second coupling circuit 330 is communicatively connected to an input end of the second isolation module 20 .

[0030] It should be noted that communication is achieved here through a carrier signal, and since the noise signal is an unexpected interference signal, it will be superimposed on the power line, affecting the propagation quality of the carrier signal. The inverting module 30 extracts the noise signal from the second output end of the first isolation module 10 through the first coupling circuit 310, and then couples the inverted noise signal generated by the inverting process to the power line through the second coupling circuit 330, and superimposes it with the noise signal. Since the inverted noise signal and the noise signal have opposite phases, the two will cancel each other out when superimposed, thereby achieving noise attenuation. Thereby, the carrier signal is free from interference from the noise signal, and ultimately the communication quality and stability are improved.

[0031] Specifically, the first isolation module 10 and the second isolation module 20 are used to isolate and suppress differential mode noise and common mode noise, that is, to prevent most noise signals from directly passing through, thereby reducing the direct impact of noise on the carrier signal of the power line.

[0032] like Figure 1 As shown, it should be noted that the PLC communication signal is modulated in the form of a high-frequency carrier and superimposed on the power line for propagation. The flow direction of the PLC communication signal is determined by the design of the transmitting device when sending the signal, that is, the signal modulation at the transmitting end determines the overall propagation direction of the communication signal, such as the communication signal is transmitted from the power line carrier communication network 1 to the power line carrier communication network 2; that is, there is no need to consider the loop characteristics of the current.

[0033] Specifically, the low-frequency power current transmitted on the power line is essentially different from the PLC communication signal. The low-frequency current is used to transmit energy, while the PLC communication signal is a high-frequency carrier signal, whose propagation direction is determined by the modulation of the transmitter, and usually adopts the differential transmission method (i.e. the differential signal between the live wire and the neutral wire).

[0034] Furthermore, the first output end of the first isolation module 10 and the output end of the second coupling circuit 330 are both communicatively connected to the intersection of the power lines, and the input end of the second isolation module 20 is communicatively connected to the intersection.

[0035] It should be noted that the communication signal output from the first output end of the first isolation module 10 and the inverted noise signal output from the output end of the second coupling circuit 330 after inversion processing intersect at the intersection of the power lines, and are further input to the input end of the second isolation module 20.

[0036] In one embodiment, the communication signal transmitted to the intersection by the first output end of the first isolation module 10 is combined with the inverted noise signal after inversion processing by the inversion module 30 at the intersection to obtain a superimposed signal; wherein the communication signal includes a carrier signal and a noise signal, and thus the superimposed signal includes a carrier signal, a noise signal and an inverted noise signal; the inverted noise signal and the original noise signal cancel each other out during the superposition process, and finally the signal noise in the superimposed signal output from the intersection is greatly attenuated, and then transmitted to the second isolation module 20 for further suppression and attenuation, thereby obtaining a relatively clean carrier signal.

[0037] The power line communication isolator provided by the embodiment of the present invention, the two output ends of the first isolation module 10, the first coupling circuit 310 and the second coupling circuit 330 of the inverting module 30, and the design of the intersection realize the effective separation and optimization processing of the communication signal and the noise signal; the collection, processing and feedback of the noise signal are highly targeted, and the noise can be dynamically suppressed in real time to improve the clarity of the communication signal. The intersection serves as a signal integration node, so that the processed signal has lower noise interference while retaining the integrity of the carrier signal.

[0038] Furthermore, the first coupling circuit 310 and the second coupling circuit 330 both include coupling capacitors.

[0039] For example, Figure 3 As shown, the communication signal is transmitted from the power line carrier communication network 1 to the power line carrier communication network 2; the first coupling circuit 310 includes coupling capacitors C3 and C4; the second coupling circuit 330 includes coupling capacitors C5 and C6; and the transformer 320 is T1.

[0040] Further, the number of turns of the primary coil of the transformer 320 is the same as the number of turns of the secondary coil of the transformer 320; The transformer 320 is used to receive the noise signal through the primary coil and output the anti-phase noise signal through the secondary coil; The antiphase noise signal has the same amplitude as the noise signal and a phase difference of 180°.

[0041] Here, the first coupling circuit 310 and the second coupling circuit 330 are used for extracting and injecting noise signals; the transformer 320 can change the signal amplitude or achieve signal inversion through the turns ratio design. The turns ratio of the transformer 320 here is 1:1, which is dedicated to inverting the signal.

[0042] Exemplarily, when a noise signal is input into the primary coil of the transformer 320, according to the electromagnetic induction principle of the transformer 320, the current in the primary coil generates an alternating magnetic field, and this alternating magnetic field induces a corresponding voltage in the secondary coil. Since the turns ratio of the transformer 320 is 1:1, the signal amplitude of the output of the secondary coil is the same as the signal amplitude of the input of the primary coil. Due to the polarity design of the transformer 320, the output signal of the secondary coil will have a phase difference of 180° compared with the input signal of the primary coil, that is, the input signal is inverted, and an inverted noise signal is finally obtained.

[0043] Exemplarily, the first coupling circuit 310 extracts a communication signal from the second output terminal of the first isolation module 10, wherein the communication signal includes a carrier signal and a noise signal. The first coupling circuit 310 uses the characteristics of the coupling capacitor, which is sensitive to frequency, and the low-frequency signal will be attenuated, while the high-frequency signal can pass smoothly; the inversion module 30 can distinguish the carrier signal and the noise signal through methods such as filtering circuit, spectrum analysis, signal modulation feature analysis or coherence detection; so that the transformer 320 only performs inversion processing on the noise signal to obtain an inverted noise signal; further, the second coupling circuit 330 couples the inverted noise signal to the intersection on the power line, so that the inverted noise signal is superimposed with the carrier signal, the noise signal, etc., and then the noise signal is attenuated during the superposition process, so that the final intersection outputs a relatively clean carrier signal.

[0044] The power line communication isolator provided in the embodiment of the present invention realizes effective suppression of power line noise signals through the synergistic effect of the first coupling circuit 310, the transformer 320 and the second coupling circuit 330. The first coupling circuit 310 utilizes the high-frequency passing characteristics of the coupling capacitor to extract the noise signal from the second output end of the first isolation module 10. The extracted noise signal is inverted through the transformer 320. The turns ratio of the transformer 320 is 1:1, and an inverted noise signal with the same amplitude as the original noise signal and a phase difference of 180° is generated when the secondary coil is output. The inverted noise signal is coupled back to the intersection of the power line through the second coupling circuit 330, and is superimposed with the original noise signal to produce a destructive effect, thereby achieving noise attenuation. This process effectively reduces the noise interference in the power line, improves the signal quality of the power line carrier communication, and enhances the stability and anti-interference ability of the communication.

[0045] like Figure 2 As shown, further, the first isolation module 10 includes a first differential mode component 110 and a first common mode component 120; The output end of the first differential mode component 110 is communicatively connected to the input end of the first common mode component 120; The first output end of the first common mode component 120 is communicatively connected to the junction of the power lines, and the second output end of the first common mode component 120 is communicatively connected to the input end of the first coupling circuit 310 .

[0046] Based on the above embodiments, it can be known that the communication signal includes a carrier signal and a noise signal, and the noise signal includes differential mode noise and common mode noise; differential mode noise refers to the differential voltage of the signals on two wires, and these signals are symmetrical with respect to the ground line. Differential mode noise is generally caused by load changes or external signal coupling; Common-mode noise refers to the fact that the voltage of the signal on two wires relative to the ground wire is the same. Common-mode noise usually comes from electromagnetic interference (EMI) or asymmetric coupling. In one embodiment, the first differential mode component 110 is used to perform preliminary separation and processing of differential mode noise of the communication signal; the communication signal processed by the differential mode component is input to the first common mode component 120 to further suppress common mode interference; after being processed by the first common mode component 120, the communication signal is shunted to the intersection through the first output end of the first common mode component 120, and the communication signal is shunted to the inverting module 30 through the second output end of the first common mode component 120.

[0047] The power line communication isolator provided in the embodiment of the present invention enhances the isolation effect and effectively reduces noise interference through step-by-step processing of the first differential mode and the first common mode, thereby providing high-quality signal transmission guarantee for the power line communication system.

[0048] Further, the first differential mode component 110 includes two first differential mode inductors and a first X capacitor; The first common mode component 120 includes a first common mode inductor.

[0049] It should be noted that the first differential mode inductor can form a high impedance to the differential mode noise, thereby effectively attenuating high-frequency differential mode interference.

[0050] For example, Figure 3 As shown, the communication signal is transmitted from the power line carrier communication network 1 to the power line carrier communication network 2; the two first differential mode inductors are L1 and L2, the first X capacitor is C1, and the first common mode inductor is L3. Through the reasonable configuration of the two inductors, flexible filtering performance is provided to adapt to the noise characteristics of different frequency bands. C1 is connected between the live wire and the neutral wire, which can bypass the high-frequency differential mode noise, so that the noise energy is discharged without entering the subsequent circuit. The X capacitor is specially designed for high-frequency operation and has good high-frequency filtering performance, ensuring the safety and stability of the circuit.

[0051] like Figure 2 As shown, further, the second isolation module 20 includes a second differential mode component 210 and a second common mode component 220; An input end of the second common mode component 220 is communicatively connected to a junction of the power lines, and an output end of the second common mode component 220 is communicatively connected to an input end of the second differential mode component 210 .

[0052] Based on the above embodiments, it can be known that the second common-mode component 220 directly receives the communication signal output from the intersection, that is, the cleaner communication signal that has been attenuated by the anti-phase noise signal; the second common-mode component 220 further suppresses the common-mode noise of the communication signal; and then inputs the communication signal after the common-mode noise is suppressed into the second differential-mode component 210 for further filtering of the differential-mode noise.

[0053] It should be noted that the first isolation module 10 is located at the input end of the power line communication isolator, and is mainly used for preliminary noise isolation when the signal enters the system, including filtering out common-mode noise and differential-mode noise, which ensures that the signal input from the power line has a certain degree of purity, laying the foundation for subsequent signal processing. The second isolation module 20 is located at the output end of the power line communication isolator, and further suppresses the signal, including eliminating the secondary noise that may be generated by the inverting module 30, and suppressing the interference returned from the power line. The existence of this module ensures the purity of the final output signal, so that it meets the communication standard of the receiving end. The double isolation module processes noise in stages, layer by layer, making the overall noise suppression effect of the system more significant and improving the signal quality.

[0054] Specifically, through the dual isolation design of the first isolation module 10 and the second isolation module 20, the system shows significant advantages in noise suppression, signal integrity assurance, anti-interference capability improvement, noise backflow suppression, etc. This hierarchical isolation method effectively solves the main pain points in power line communication and ensures communication quality and stable operation of the system.

[0055] Further, the second differential mode component 210 includes two second differential mode inductors and a second X capacitor; The second common mode component 220 includes a second common mode inductor.

[0056] For example, Figure 3 As shown, the communication signal is transmitted from the power line carrier communication network 1 to the power line carrier communication network 2; the two second differential mode inductors are L5 and L6, the second X capacitor is C2, and the second common mode inductor is L4. The focus is on dealing with the interference that may occur in the inverting module 30 to ensure the purity of the final output signal so that it meets the communication standard of the receiving end.

[0057] For example, in PLC communication, the carrier signal is a signal that uses a high-frequency signal (usually within 30MHz) as a medium to encode data and load it onto the power line for transmission. It is the core of PLC communication and carries actual data information. Noise signals are the main cause of carrier signal distortion or even loss. Through the reverse attenuation technology, the intensity of the noise signal is effectively reduced, the interference to the carrier signal is significantly reduced, and the clarity and integrity of the communication signal are improved. The reduction of noise interference improves the signal-to-noise ratio (SNR) of the signal on the power line, thereby improving the transmission efficiency and decoding accuracy of the carrier signal, and ensuring the stability and reliability of data communication. The isolator is connected to the power line through a coupling circuit, and there is no direct physical change to the original carrier signal. It only optimizes the signal environment through noise cancellation, and has high compatibility.

[0058] The power line communication isolator provided by the present invention effectively solves the problem of noise interference in power line communication through technical means such as double isolation of the first isolation module 10 and the second isolation module 20, and inverting attenuation of noise signals by the inverting module 30, thereby improving the performance of the PLC system, enhancing the anti-interference ability and stability of the system, and is suitable for various power line carrier communication environments.

[0059] Furthermore, the present invention also provides a communication device, which integrates the power line communication isolator proposed in any of the above embodiments, and improves the transmission quality of the communication signal by reversely attenuating the noise signal on the power line, effectively reducing noise interference. The communication device can be widely used in scenarios such as smart home, industrial automation, and distributed energy management, significantly enhancing the reliability and stability of the system, while improving the anti-interference performance of the device, and providing users with an efficient and stable communication experience.

[0060] Furthermore, if Figure 4 As shown, the present invention also provides a power line communication isolation method, the method comprising: Step 410: collecting a signal output from the second output terminal of the first isolation module through a first coupling circuit of the inverting module to obtain a noise signal; the first output terminal of the first isolation module is connected to the input terminal of the second isolation module through power line communication; Step 420: input the noise signal to the primary coil of the transformer of the inverting module, and output the inverted noise signal output by the secondary coil of the transformer of the inverting module to the second coupling circuit of the inverting module; the transformer is used to perform inverting processing on the noise signal to obtain an inverted noise signal; Step 430: Couple the inverted noise signal to the input end of the second isolation module through the second coupling circuit of the inverting module.

[0061] Exemplarily, the first isolation module, the inverting module and the second isolation module are connected in sequence, and the inverting module includes a first coupling circuit, a transformer and a second coupling circuit connected in sequence. The function of the first coupling circuit is to collect signals from the second output end of the first isolation module to obtain a noise signal. The noise signal is input into the transformer in the inverting module through the first coupling circuit. Since the number of turns of the primary and secondary coils of the transformer is equal, an inverted noise signal is generated in the secondary coil by electromagnetic induction. At this time, the inverted noise signal is equal to the amplitude of the noise signal and the phase difference is 180°; the inverted noise signal is coupled from the secondary coil of the transformer to the power line through the second coupling circuit, and superimposed with the original noise signal. Because the phase of the inverted noise signal is opposite to that of the original noise signal, the two will cancel each other out after addition, which greatly reduces the interference of noise to the communication signal and achieves the effect of attenuating noise.

[0062] Furthermore, the first output end of the first isolation module and the input end of the second isolation module are both communicatively connected to the intersection of the power lines, and the method further includes: coupling the inverted noise signal to the intersection of the power lines through the second coupling circuit of the inverting module; Sending the noise signal to the intersection of the power lines through the first output terminal of the first isolation module; The anti-phase noise signal is used to perform anti-phase attenuation with the noise signal at the intersection of the power lines.

[0063] Exemplarily, the output end of the first isolation module is connected to the power line, allowing the noise signal to be transmitted to the intersection; further, the second coupling circuit couples the anti-phase noise signal to the intersection of the power line. Since the anti-phase noise signal and the noise signal have the same amplitude and a phase difference of 180°, when the anti-phase noise signal and the noise signal meet at the intersection, they will cancel each other out, i.e., anti-phase attenuation. Since the input end of the second isolation module is connected to the intersection of the power line, the cleaner signal communication signal obtained after anti-phase attenuation can be directly input into the second isolation module.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power line communication isolator, characterized in that: The power line communication isolator comprises a first isolation module, an inversion module and a second isolation module; the inversion module comprises a first coupling circuit, a transformer and a second coupling circuit connected in sequence; The first output end of the first isolation module is connected to the input end of the second isolation module via power line communication; The second output end of the first isolation module is communicatively connected to the input end of the first coupling circuit, and the output end of the first coupling circuit is connected to the primary coil of the transformer; The input end of the second coupling circuit is connected to the secondary coil of the transformer, and the output end of the second coupling circuit is communicatively connected to the input end of the second isolation module.

2. The power line communication isolator according to claim 1, characterized in that: The first output end of the first isolation module and the output end of the second coupling circuit are both communicatively connected to the intersection of the power lines, and the input end of the second isolation module is communicatively connected to the intersection.

3. The power line communication isolator according to claim 1, characterized in that: The first coupling circuit and the second coupling circuit both include coupling capacitors.

4. The power line communication isolator according to claim 1, characterized in that: The number of turns of the primary coil of the transformer is the same as the number of turns of the secondary coil of the transformer; The transformer is used to receive a noise signal through a primary coil and output an anti-phase noise signal through the secondary coil.

5. The power line communication isolator according to claim 4, characterized in that: The anti-phase noise signal has the same amplitude as the noise signal and a phase difference of 180°.

6. The power line communication isolator according to claim 2, characterized in that: The first isolation module includes a first differential mode component and a first common mode component; The output end of the first differential mode component is communicatively connected to the input end of the first common mode component; The first output end of the first common mode component is communicatively connected to the junction of the power lines, and the second output end of the first common mode component is communicatively connected to the input end of the first coupling circuit.

7. The power line communication isolator according to claim 2, characterized in that: The second isolation module includes a second differential mode component and a second common mode component; An input end of the second common mode component is communicatively connected to a junction of the power lines, and an output end of the second common mode component is communicatively connected to an input end of the second differential mode component.

8. A communication device, characterized in that: The communication device comprises the power line communication isolator according to any one of claims 1 to 7.

9. A power line communication isolation method, characterized in that: Applied to the power line communication isolator according to any one of claims 1 to 7, the method comprising: The signal output from the second output end of the first isolation module is collected by the first coupling circuit of the inverting module to obtain a noise signal; the first output end of the first isolation module is connected to the input end of the second isolation module through power line communication; The noise signal is input to the primary coil of the transformer of the inverting module, and the inverted noise signal output by the secondary coil of the transformer of the inverting module is output to the second coupling circuit of the inverting module; the transformer is used to perform inverting processing on the noise signal to obtain an inverted noise signal; The inverted noise signal is coupled to the input end of the second isolation module through the second coupling circuit of the inverting module.

10. The power line communication isolation method according to claim 9, characterized in that: The first output end of the first isolation module and the input end of the second isolation module are both communicatively connected to the intersection of the power lines, and the method further includes: coupling the inverted noise signal to the intersection of the power lines through the second coupling circuit of the inverting module; Sending the noise signal to the intersection of the power lines through the first output terminal of the first isolation module; The anti-phase noise signal is used to perform anti-phase attenuation with the noise signal at the intersection of the power lines.

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