Power line communication isolator and communication equipment
By introducing an inverting module and a power line communication isolator with multi-level isolation design, the problem of noise signal impact on PLC communication network is solved, achieving precise noise signal attenuation and efficient signal transmission, thus improving communication stability and reliability.
Patent Information
- Application Number
- CN202423228581.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing power line communication isolators have limited attenuation of noise signals, which affects the stability and reliability of PLC communication networks.
A power line communication isolator including a first isolation module, an inverting module, and a second isolation module is adopted. The noise signal is extracted by the inverting module and processed by the transformer to generate an inverted noise signal with the opposite phase to the noise signal. Multi-level isolation is achieved by combining differential mode and common mode components to achieve noise signal attenuation.
It effectively reduces noise intensity, improves the stability and reliability of PLC communication networks, enhances the clarity and integrity of communication signals, and strengthens anti-interference capabilities.
Smart Images
Figure CN223584178U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to communication technical field especially, relate to a kind of power line communication isolator and communication equipment. BACKGROUND
[0002] With the rapid development of Internet of Things technology, power line carrier communication (PLC) as a kind of data transmission technology using existing power line, has been widely used in smart home, industrial automation and energy management etc. Field. PLC communication avoids the high cost of laying communication line alone, so that devices can communicate efficiently. However, due to the existence of various noise sources in the power line environment, such as high-power electrical appliances, external electromagnetic interference, etc., the stability and reliability of PLC communication face serious challenges. Noise signals and power line main signals are mixed together, resulting in communication packet loss, delay, even network interruption, etc.
[0003] The existing power line communication isolator mostly adopts traditional differential mode and common mode isolation mode, although it can suppress noise signals to some extent, but its isolation effect is still not ideal, especially under the influence of high-power electrical equipment and external electromagnetic interference, the existing power line communication isolator has small attenuation to noise signals, resulting in that noise signals can still affect the stability of PLC communication network. UTILITY MODEL CONTENTS
[0004] The utility model provides a kind of power line communication isolator and communication equipment to solve the defect that the attenuation of noise signals of the existing power line communication isolator is small, resulting in that noise signals can still affect the stability of PLC communication network.
[0005] The utility model provides a kind of power line communication isolator, including first isolation module, inverse module and second isolation module;The inverse module includes first coupling circuit, transformer and second coupling circuit connected in sequence;
[0006] The first output end of the first isolation module is connected with the input end of the second isolation module by power line communication;
[0007] The second output end of the first isolation module is connected with the input end of the first coupling circuit, and the output end of the first coupling circuit is connected with the primary coil of the transformer;
[0008] The input end of the second coupling circuit is connected with the secondary coil of the transformer, and the output end of the second coupling circuit is connected with the input end of the second isolation module.
[0009] According to the utility model provides a kind of power line communication isolator, including:
[0010] 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 line, and the input end of the second isolation module is communicatively connected to the intersection.
[0011] According to the power line communication isolator provided by the utility model, the first coupling circuit and the second coupling circuit both comprise coupling capacitors.
[0012] According to the power line communication isolator provided by the utility model, 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.
[0013] The transformer is used for receiving a noise signal through the primary coil and outputting an inverted noise signal through the secondary coil.
[0014] According to the power line communication isolator provided by the utility model, the inverted noise signal has the same amplitude as the noise signal and a phase difference of 180 degrees.
[0015] According to the power line communication isolator provided by the utility model, the first isolation module comprises a first differential mode component and a first common mode component.
[0016] The output end of the first differential mode component is communicatively connected to the input end of the first common mode component.
[0017] The first output end of the first common mode component is communicatively connected to the intersection of the power line, and the second output end of the first common mode component is communicatively connected to the input end of the first coupling circuit.
[0018] According to the power line communication isolator provided by the utility model, the first differential mode component comprises two first differential mode inductors and a first X capacitor.
[0019] The first common mode component comprises a first common mode inductor.
[0020] According to the power line communication isolator provided by the utility model, the second isolation module comprises a second differential mode component and a second common mode component.
[0021] The input end of the second common mode component is communicatively connected to the intersection of the power line, and the output end of the second common mode component is communicatively connected to the input end of the second differential mode component.
[0022] According to the power line communication isolator provided by the utility model, the second differential mode component comprises two second differential mode inductors and a second X capacitor.
[0023] The second common mode component comprises a second common mode inductor.
[0024] The utility model also provides a kind of communication equipment, and the communication equipment includes the power line communication isolator of any one of the above.
[0025] The utility model provides a power line communication isolator, including first isolation module, inverse module and second isolation module, the inverse module includes first coupling circuit, transformer and second coupling circuit are connected in proper order, the first output of first isolation module is connected with the input of second isolation module by power line communication, the second output of first isolation module is connected with the input of first coupling circuit, and the output of first coupling circuit is connected with the primary coil of transformer, the input of second coupling circuit is connected with the secondary coil of transformer, and the output of second coupling circuit is connected with the input of second isolation module. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will be to the drawings needed to be used in the embodiment or the prior art description a simple introduction, obviously, the following description in the drawing is some embodiments of the utility model, for those skilled in the art, without creative labor, according to these drawings, other drawings can also be obtained.
[0027] Figure 1 It is one of the structure schematic view of the utility model provided power line communication isolator.
[0028] Figure 2 It is the second structure schematic view of the utility model provided power line communication isolator.
[0029] Figure 3 It is the third structure schematic view of the utility model provided power line communication isolator.
[0030] Reference signs:
[0031] 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
[0032] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be clearly and completely described below in combination with the drawings in the utility model. Obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.
[0033] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0034] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium. For the person skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0035] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0036] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction. In addition, the term "a plurality of" means two or more.
[0037] Referring to Figure 1 , Figure 1 is one of the structural schematic diagrams of the power line communication isolator provided by the present application, as shown in the figure, the power line communication isolator comprises a first isolation module 10, an inversion module 30 and a second isolation module 20; the inversion module 30 comprises 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 with the input end of the second isolation module 20 through power line communication. Figure 1
[0038] The second output end of the first isolation module 10 is in communication connection with the input end of the first coupling circuit 310, and the output end of the first coupling circuit 310 is connected with the primary coil of the transformer 320.
[0039] The input end of the second coupling circuit 330 is connected with the secondary coil of the transformer 320, and the output end of the second coupling circuit 330 is in communication connection with the input end of the second isolation module 20.
[0040] It should be noted that communication is realized by carrier signal here, and since noise signal is a kind of unexpected interference signal, it will be superimposed on the power line, affecting the propagation quality of the carrier signal. The inversion 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 generates the inversion noise signal by inversion processing, which is coupled to the power line through the second coupling circuit 330, superimposed with the noise signal. Since the inversion noise signal and the noise signal are opposite in phase, they will cancel each other out when superimposed, thereby realizing noise attenuation. Thus, the carrier signal is immune to the interference of the noise signal, and finally the communication quality and stability are improved.
[0041] 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.
[0042] As Figure 1 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 when the transmitting end device transmits 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 transmitted from the power line carrier communication network 1 to the power line carrier communication network 2; that is, the loop characteristics of the current do not need to be considered.
[0043] Specifically, the low-frequency power current transmitted on the power line is essentially different from the PLC communication signal. The low-frequency current is for energy transmission, while the PLC communication signal is a high-frequency carrier signal, and the propagation direction thereof is determined by the modulation at the transmitting end, and usually adopts a differential transmission manner (i.e., a differential signal between the live wire and the neutral wire).
[0044] Further, 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 line, and the input end of the second isolation module 20 is communicatively connected to the intersection.
[0045] It should be noted that the communication signal output by the first output end of the first isolation module 10 and the inverted noise signal output by the output end of the second coupling circuit 330 are superimposed at the intersection of the power line, and then further input to the input end of the second isolation module 20.
[0046] In an embodiment, the communication signal transmitted by the first output end of the first isolation module 10 and the inverted noise signal processed by the inverting module 30 are combined 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 the carrier signal, the noise signal, and the inverted noise signal; the inverted noise signal and the original noise signal cancel each other out in the superimposition process, and 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, so as to obtain a relatively clean carrier signal.
[0047] The power line communication isolator provided by the embodiment of the utility model, the design of 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 intersection realizes the effective separation and optimization processing of the communication signal and the noise signal; the collection, processing and feedback of the noise signal have high pertinence, can dynamically and real-timely suppress the noise, and improve the definition of the communication signal. The intersection as a signal integration node makes the processed signal have lower noise interference, while retaining the integrity of the carrier signal.
[0048] Further, the first coupling circuit 310 and the second coupling circuit 330 each include a coupling capacitor.
[0049] Exemplarily, as shown in the figure, 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 a coupling capacitor C3 and a coupling capacitor C4; the second coupling circuit 330 includes a coupling capacitor C5 and a coupling capacitor C6; and the transformer 320 is T1. Figure 3
[0050] 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.
[0051] The transformer 320 is configured to receive the noise signal through the primary coil and output the inverted noise signal through the secondary coil.
[0052] The inverted noise signal has the same amplitude and a phase difference of 180° from the noise signal.
[0053] Here, the first coupling circuit 310 and the second coupling circuit 330 are configured to extract and inject the noise signal; the transformer 320 can change the signal amplitude or realize signal inversion through the turns ratio design, and the transformer 320 here has a turns ratio of 1:1 and is specially configured to invert the signal.
[0054] Exemplarily, when the noise signal is input to 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 the alternating magnetic field induces a corresponding voltage in the secondary coil. Since the transformer 320 has a turns ratio of 1:1, the signal amplitude output by the secondary coil is the same as the signal amplitude input by the primary coil. However, due to the polarity design of the transformer 320, the output signal of the secondary coil has a phase difference of 180° from the input signal of the primary coil, that is, the input signal is inverted, and finally the inverted noise signal is obtained.
[0055] Exemplarily, the first coupling circuit 310 extracts the communication signal from the second output end of the first isolation module 10, wherein the communication signal includes a carrier signal and a noise signal. The first coupling circuit 310 can distinguish the carrier signal and the noise signal through the characteristics of the coupling capacitor, that is, low-frequency signals are attenuated and high-frequency signals can pass through smoothly; the inversion module 30 can distinguish the carrier signal and the noise signal through filtering, spectral analysis, signal modulation characteristic analysis, or coherence detection; so that the transformer 320 only inverts the noise signal to obtain the inverted noise signal; further, the second coupling circuit 330 couples the inverted noise signal to the intersection position on the power line, so that the inverted noise signal is superimposed with the carrier signal, the noise signal, etc., and the noise signal is attenuated in the superimposition process, so that the final intersection position outputs a relatively clean carrier signal.
[0056] The power line communication isolator provided by the embodiment of the utility model realizes effective suppression of the power line noise signal through the synergistic effect of the first coupling circuit 310, the transformer 320 and the second coupling circuit 330. The first coupling circuit 310 extracts the noise signal from the second output end of the first isolation module 10 by using the high-frequency passing characteristic of the coupling capacitor, and the extracted noise signal is subjected to inverse processing by the transformer 320, and by using the characteristic that the number of turns of the transformer 320 is 1:1, an inverse noise signal with the same amplitude and a phase difference of 180° from the original noise signal is generated when the secondary coil outputs. The inverse noise signal is coupled back to the intersection of the power line through the second coupling circuit 330, and the original noise signal is superimposed to generate a destructive effect, so as to realize 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.
[0057] As shown in Figure 2 Further, the first isolation module 10 includes a first differential mode component 110 and a first common mode component 120;
[0058] The output end of the first differential mode component 110 is in communication connection with the input end of the first common mode component 120;
[0059] The first output end of the first common mode component 120 is in communication connection with the intersection of the power line, and the second output end of the first common mode component 120 is in communication connection with the input end of the first coupling circuit 310.
[0060] Based on the above embodiment, it can be known that the communication signal includes a carrier signal and a noise signal, and the noise signal includes a differential mode noise and a common mode noise; the differential mode noise refers to the differential voltage of the signals on the two wires, and these signals are symmetrical with respect to the ground wire. The differential mode noise is generally caused by load changes or external signal coupling;
[0061] The common mode noise refers to the voltage of the signals on the two wires with respect to the ground wire being the same, and the common mode noise is usually derived from electromagnetic interference (EMI) or asymmetric coupling;
[0062] In an embodiment, the first differential mode component 110 is used for preliminarily separating and processing the 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 for further suppression of the 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 inverse module 30 through the second output end of the first common mode component 120.
[0063] The power line communication isolator provided by the embodiment of the utility model enhances the isolation effect through the step-by-step processing of the first differential mode and the first common mode, effectively reduces noise interference, and provides high-quality signal transmission guarantee for the power line communication system.
[0064] Further, the first differential mode component 110 includes two first differential mode inductors and a first X capacitor.
[0065] The first common mode component 120 includes a first common mode inductor.
[0066] It should be noted that the first differential mode inductor can form high impedance to differential mode noise, thereby effectively attenuating high-frequency differential mode interference.
[0067] Exemplarily, as shown in Figure 3 , 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 respectively, the first X capacitor is C1, and the first common mode inductor is L3. Through 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 high-frequency differential mode noise, so that the noise energy is discharged without entering the subsequent circuit. The X capacitor is designed for high-frequency operation and has good high-frequency filtering performance, which ensures the safety and stability of the circuit.
[0068] As shown in Figure 2 , further, the second isolation module 20 includes a second differential mode component 210 and a second common mode component 220;
[0069] The input end of the second common mode component 220 is in communication connection with the intersection of the power line, and the output end of the second common mode component 220 is in communication connection with the input end of the second differential mode component 210.
[0070] Based on the above embodiment, it can be known that the second common mode component 220 directly receives the communication signal output from the intersection, that is, the relatively clean communication signal that has been attenuated by the inverted 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 common mode noise suppression to the second differential mode component 210 for further filtering processing of differential mode noise.
[0071] It is important to note that the first isolation module 10 is located at the input end of the power line communication isolator. Its primary function is to perform initial noise isolation when the signal enters the system, including filtering out common-mode and differential-mode noise. This ensures a certain level of purity in the signal input from the power line, laying the foundation for subsequent signal processing. The second isolation module 20 is located at the output end of the power line communication isolator, further suppressing noise. This includes eliminating secondary noise that may be generated by the inverting module 30 and suppressing interference returning from the power line. The presence of this module ensures the purity of the final output signal, meeting the communication standards of the receiving end. The dual isolation modules process noise in stages, progressively improving the overall noise suppression effect of the system and enhancing signal quality.
[0072] Specifically, through the dual isolation design of the first isolation module 10 and the second isolation module 20, the system exhibits significant advantages in noise suppression, signal integrity assurance, enhanced anti-interference capability, and noise backflow suppression. This hierarchical isolation method effectively solves the main pain points in power line communication, ensuring communication quality and stable system operation.
[0073] Furthermore, the second differential mode component 210 includes two second differential mode inductors and a second X capacitor;
[0074] The second common-mode component 220 includes a second common-mode inductor.
[0075] For example, such as Figure 3 As shown, the communication signal is transmitted from power line carrier communication network 1 to 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. Emphasis is placed on handling potential interference in the inverting module 30 to ensure the purity of the final output signal, making it meet the communication standards of the receiving end.
[0076] For example, in PLC communication, the carrier signal is a signal transmitted over the power line after data encoding, using a high-frequency signal (typically below 30MHz) as the medium. It is the core of PLC communication, carrying the actual data information. Noise signals are the main cause of carrier signal distortion or even loss. Through inverse attenuation technology, the intensity of noise signals is effectively reduced, significantly minimizing interference with the carrier signal and improving the clarity and integrity of the communication signal. 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, ensuring the stability and reliability of data communication. The isolator is connected to the power line through a coupling circuit, without directly altering the original carrier signal physically; it optimizes the signal environment only through noise cancellation, offering high compatibility.
[0077] The power line communication isolator provided by the utility model solves the problem of noise interference in power line communication through the double isolation of the first isolation module 10 and the second isolation module 20 and the inverse phase attenuation of the noise signal by the inverse phase module 30, thereby improving the performance of the PLC system, enhancing the anti-interference ability and stability of the system and being applicable to various power line carrier communication environments.
[0078] Further, the utility model further provides a kind of communication equipment, the communication equipment integrates the power line communication isolator proposed in any embodiment above, by inverse phase attenuation to the noise signal on power line, improve the transmission quality of communication signal, effectively reduce noise interference.The communication equipment can be widely applied to smart home, industrial automation, distributed energy management etc.Situation, significantly enhance the reliability and stability of system, while improve the anti-interference performance of equipment, provide efficient, stable communication experience for user.
[0079] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.
Claims
1. A power line communication isolator, characterized by, The power line communication isolator 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; a first output end of the first isolation module is connected with an input end of the second isolation module through power line communication; a second output end of the first isolation module is connected with an input end of the first coupling circuit, and an output end of the first coupling circuit is connected with a primary coil of the transformer; an input end of the second coupling circuit is connected with a secondary coil of the transformer, and an output end of the second coupling circuit is connected with the input end of the second isolation module.
2. The power line communication isolator of claim 1, wherein, The first output end of the first isolation module and the output end of the second coupling circuit are both connected with a junction of the power line, and the input end of the second isolation module is connected with the junction.
3. The power line communication isolator of claim 1, wherein, The first coupling circuit and the second coupling circuit both comprise a coupling capacitor.
4. The power line communication isolator of claim 1, wherein, 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 for receiving a noise signal through the primary coil and outputting an inverted noise signal through the secondary coil.
5. The power line communication isolator of claim 4, wherein, The inverted noise signal has the same amplitude as the noise signal and a phase difference of 180°.
6. The power line communication isolator of claim 2, wherein, The first isolation module comprises a first differential mode component and a first common mode component; an output end of the first differential mode component is connected with an input end of the first common mode component; a first output end of the first common mode component is connected with the junction of the power line, and a second output end of the first common mode component is connected with the input end of the first coupling circuit.
7. The power line communication isolator of claim 6, wherein, The first differential mode component comprises two first differential mode inductors and a first X capacitor; The first common mode component comprises a first common mode inductor.
8. The power line communication isolator of claim 2, wherein, The second isolation module comprises a second differential mode component and a second common mode component; an input end of the second common mode component is connected with the junction of the power line, and an output end of the second common mode component is connected with an input end of the second differential mode component.
9. The power line communication isolator of claim 8, wherein, The second differential mode component comprises two second differential mode inductors and a second X capacitor; The second common mode component comprises a second common mode inductor.
10. A communication device, characterized by The communication device comprises the power line communication isolator according to any one of claims 1 to 9.