Power line data transmission method and system and Internet of Things system

Abstract

The invention provides a power line data transmission method and system and an Internet of Things system. The power line data transmission method comprises the following steps: acquiring a to-be-transmitted signal of a sending node; amplifying the to-be-transmitted signal to a predetermined voltage, and then coupling the to-be-transmitted signal to a power line for transmission; and performing power detection on the received to-be-transmitted signal, and if the power of the to-be-transmitted signal does not meet the signal power which can be identified by the receiving node, adjusting the signal power of the to-be-transmitted signal to the signal power which can be identified by the receiving node, and transmitting the to-be-transmitted signal to the receiving node. According to the invention, the reliability in the power line data transmission process can be effectively improved.

Description

[0001] This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office on October 31, 2023, with application number 2023114356468 and application name “A power line data transmission method, system and Internet of Things system”, all contents of which are incorporated by reference in this application. Technical Field

[0002] The present invention relates to the technical field of data transmission, and in particular to a power line data transmission method, system and an Internet of Things system. Background Art

[0003] With the continuous development of the current Internet of Things technology, PLC (Power Line Carrier) power line carrier communication technology is becoming more and more widely used in whole-house smart home applications. In the existing scheme, the peak-to-peak voltage of the power line carrier signal band generally does not exceed 10V, and the maximum output power is about 3W; due to the complex layout and distribution of the power grid, the interference in the data transmission process is relatively large, and the signal attenuation is relatively large during long-distance transmission; when the power line load is large, it is also easily interfered by power line noise. When the power line is connected to some high-power electrical appliances, such as air conditioners, induction cookers, refrigerators, etc., it is easy to generate a lot of noise to interfere with PLC communication, resulting in data packet loss, group failure to access the Internet, and inability to control.

[0004] Therefore, a power line data transmission method needs to be proposed to improve the reliability of data transmission. Summary of the invention

[0005] A technical problem to be solved by the present invention is to provide a power line data transmission method, system and Internet of Things system, which can effectively improve the reliability of power line data transmission.

[0006] According to a first aspect of the present invention, there is provided a power line data transmission method, comprising:

[0007] Obtain the signal to be transmitted from the sending node;

[0008] Amplifying the signal to be transmitted to a predetermined voltage and coupling it to the power line for transmission;

[0009] The power of the received signal to be transmitted is detected. If the signal power of the signal to be transmitted does not meet the signal power recognizable by the receiving node, the signal power of the signal to be transmitted is adjusted to the signal power recognizable by the receiving node and then transmitted to the receiving node.

[0010] Based on the above scheme, during the data transmission process of the IoT node, the signal to be transmitted of the sending node is amplified to a predetermined voltage and then coupled to the power line for transmission. By amplifying the signal and then transmitting it, the transmission distance can be increased and the signal interference in the network can be reduced. At the same time, on the receiving node side, the amplified signal to be transmitted is coupled from the power line to receive the signal to be transmitted, and dynamic power control is performed to avoid excessive signal power, which affects the power safety of the receiving node, or to avoid too low signal power, which causes the receiving node to be unable to effectively identify the signal to be transmitted. That is, through this scheme, the reliability of data transmission is improved.

[0011] In one implementation of the first aspect of the present invention, the step of adjusting the signal power of the signal to be transmitted to a signal power recognizable by the receiving node includes:

[0012] If the signal power of the signal to be transmitted is less than the signal power recognizable by the receiving node, amplifying the signal power of the signal to be transmitted to the signal power recognizable by the receiving node;

[0013] If the signal power of the signal to be transmitted is greater than the signal power recognizable by the receiving node, the signal power of the signal to be transmitted is reduced to the signal power recognizable by the receiving node.

[0014] Based on the above solution, specific power adjustment can be performed according to the signal power that can be recognized by the receiving node before transmission to the receiving node.

[0015] In one embodiment of the first aspect of the present invention, if the distance between the sending node and the receiving node exceeds a preset distance, the power of the signal to be transmitted is relayed and amplified at a predetermined position between the sending node and the receiving node, and then coupled to the power line for transmission.

[0016] Based on the above scheme, when the sending node is far away from the receiving node, signal amplification can be performed at a predetermined position of the transmission path between the sending node and the receiving node to ensure the signal transmission distance and reduce signal interference during signal transmission.

[0017] In one implementation of the first aspect of the present invention, before adjusting the signal power of the signal to be transmitted to the signal power recognizable by the receiving node, the step further includes: acquiring the signal power recognizable by the receiving node from the receiving node in real time;

[0018] If the signal power of the signal to be transmitted does not meet the signal power identifiable by the receiving node obtained in real time, the signal power of the signal to be transmitted is adjusted to the signal power identifiable by the receiving node obtained in real time and then transmitted to the receiving node.

[0019] Based on the above scheme, the specific power adjustment can be performed in real time according to the signal power that the receiving node can identify before transmitting to the receiving node. Instead of adapting the receiving node and the power adjustment parameter according to the pre-configured power adjustment parameter, it can be more flexible and more applicable.

[0020] In one implementation of the first aspect of the present invention, before performing power detection on the received signal to be transmitted, the method includes:

[0021] Obtaining a receiving end signal and performing power attenuation on the receiving end signal; performing power attenuation on the receiving end signal according to a power attenuation coefficient; wherein the receiving end signal includes a noise signal and a signal to be transmitted;

[0022] A signal to be transmitted is separated from the receiving end signal.

[0023] Based on this scheme, the useful signal to be transmitted is amplified before, and the noise signal is not amplified at this time; and on the receiving node side, the receiving end signal (including the noise signal and the useful signal to be transmitted) is attenuated, so that the noise signal becomes smaller than the useful signal to be transmitted, or even zero, which can further improve the reliability of transmission.

[0024] In one implementation of the first aspect of the present invention, attenuating the power of the receiving end signal includes:

[0025] The power attenuation coefficient of the receiving end signal is determined according to the signal amplification factor, wherein the signal amplification factor is used when the signal to be transmitted is amplified to a predetermined voltage.

[0026] In one implementation of the first aspect of the present invention, attenuating the signal power of the receiving end signal includes:

[0027] When the signal power of the receiving end signal is attenuated, the power is attenuated with the signal power that can be recognized by the receiving node as the lower limit.

[0028] A second aspect of the present invention provides a power line data transmission system, comprising:

[0029] A first signal amplifier, used to amplify the acquired signal to be transmitted to a predetermined voltage and then couple it to the power line for transmission;

[0030] A first coupler, used for coupling the amplified signal to be transmitted to the power line for transmission;

[0031] A second coupler, used for coupling and receiving a signal to be transmitted;

[0032] A power detector, used for detecting the signal power of the signal to be transmitted;

[0033] A judgment unit, configured to send a power adjustment signal to the power adjuster if the signal power of the signal to be transmitted does not meet the signal power recognizable by the receiving node;

[0034] The power adjuster is used to adjust the signal power of the signal to be transmitted to the signal power recognizable by the receiving node according to the power adjustment signal, and then transmit it to the receiving node.

[0035] Based on the above scheme, during the data transmission process of the IoT node, the signal to be transmitted of the sending node is amplified to a predetermined voltage and then coupled to the power line for transmission. By amplifying the signal and then transmitting it, the transmission distance can be increased and the signal interference in the network can be reduced. At the same time, on the receiving node side, the amplified signal to be transmitted is coupled from the power line to receive the signal to be transmitted, and dynamic power control is performed to avoid excessive signal power, which affects the power safety of the receiving node, or to avoid too low signal power, which causes the receiving node to be unable to effectively identify the signal to be transmitted. That is, through this scheme, the reliability of data transmission is improved.

[0036] In one implementation of the second aspect of the present invention, the power line data transmission system further includes a sending node and a receiving node, wherein the sending node is used to send a signal to be transmitted; and the receiving node is used to receive the signal to be transmitted after power adjustment.

[0037] A third aspect of the present invention provides an Internet of Things system, comprising: using the power line data transmission method of the first aspect and various embodiments of the present invention to perform data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present invention, a brief introduction is given below to the drawings required for use in the embodiments or descriptions 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 any creative work.

[0039] Figure 1 is a schematic flow chart of a power line data transmission method according to the present invention.

[0040] Figure 2 is a schematic diagram of an embodiment of a method for power line data transmission according to the present invention;

[0041] Figure 3 is a schematic diagram of another embodiment of a method for power line data transmission according to the present invention;

[0042] Figure 4 is a schematic block diagram of a power line data transmission system according to the present invention;

[0043] Figure 5is another schematic block diagram of a power line data transmission system according to the present invention. DETAILED DESCRIPTION

[0044] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one or more (including two). The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0045] References to "one embodiment" or "some embodiments" etc. described in this specification mean that the specific features, structures or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. The term "connected" includes direct and indirect connections, unless otherwise specified.

[0046] In the following, the terms "first", "second" are used only for descriptive purposes and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly include one or more of the features.

[0047] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0048] A power line data transmission method, system and Internet of Things system according to the present invention are described in detail below with reference to the accompanying drawings.

[0049] First, refer to Figure 1 According to a first aspect of the present invention, a power line data transmission method is provided, comprising:

[0050] S101, amplifying a signal to be transmitted of a sending node to a predetermined voltage;

[0051] Among them, on the sending node side, the signal to be transmitted is amplified to a predetermined voltage, such as amplifying the voltage of the signal to be transmitted to 50V. The present invention does not limit the specific amplified voltage value, and customized amplification can be performed according to specific needs, but it should be performed under the condition of ensuring safety.

[0052] S102, coupling the amplified signal to be transmitted to the power line for transmission;

[0053] The signal to be transmitted after voltage amplification is coupled to the power line for transmission.

[0054] S103, performing power detection on the received signal to be transmitted;

[0055] At the receiving node side, the signal to be transmitted on the power line is coupled and received, and signal power detection is performed before the signal to be transmitted is input to the receiving node.

[0056] S104. Determine whether the received signal power of the signal to be transmitted satisfies the signal power recognizable by the receiving node; if the signal power of the signal to be transmitted satisfies the signal power recognizable by the receiving node, proceed to step S105; if the signal power of the signal to be transmitted does not satisfy the signal power recognizable by the receiving node, proceed to step S106; wherein, it can be understood that the signal power recognizable by the receiving node can be a power range, which can be understood as the signal receiving sensitivity of the receiving node.

[0057] S105, transmitting the signal to be transmitted to the receiving node;

[0058] S106: Adjust the signal power of the signal to be transmitted to a signal power recognizable by the receiving node and then transmit the signal to the receiving node.

[0059] Based on the above scheme, during the data transmission process of the IoT node, the signal to be transmitted of the sending node is amplified to a predetermined voltage and then coupled to the power line for transmission. By amplifying the signal and then transmitting it, the transmission distance can be increased and the signal interference in the network can be reduced. At the same time, on the receiving node side, the amplified signal to be transmitted is coupled from the power line to receive the signal to be transmitted, and dynamic power control is performed to avoid excessive signal power, which affects the power safety of the receiving node, or to avoid too low signal power, which causes the receiving node to be unable to effectively identify the signal to be transmitted. That is, through this scheme, the reliability of data transmission is improved.

[0060] In one implementation of the first aspect of the present invention, the step S106 of adjusting the signal power of the signal to be transmitted to a signal power recognizable by the receiving node includes:

[0061] S1061. If the signal power of the signal to be transmitted is less than the signal power recognizable by the receiving node, amplify the signal power of the signal to be transmitted to a signal power recognizable by the receiving node;

[0062] S1062: If the signal power of the signal to be transmitted is greater than the signal power recognizable by the receiving node, reduce the signal power of the signal to be transmitted to a signal power recognizable by the receiving node.

[0063] It can be understood that when the signal power recognizable by the receiving node is a power range, in this embodiment, in step S1061, 'signal power recognizable by the receiving node' refers to the lower limit value of the power range recognizable by the receiving node; in step S1062, 'signal power recognizable by the receiving node' refers to the upper limit value of the power range recognizable by the receiving node.

[0064] Based on the above scheme, the specific power can be adjusted according to the signal power that the receiving node can identify before transmitting to the receiving node. When making specific adjustments, the tolerable voltage and tolerable current of the receiving node need to be considered, and the signal power is adjusted under the condition of ensuring the safety of the equipment.

[0065] In one embodiment of the first aspect of the present invention, if the distance between the sending node and the receiving node exceeds a preset distance, the power of the signal to be transmitted is relayed and amplified at a predetermined position between the sending node and the receiving node, and then coupled to the power line for transmission. In some embodiments, a plurality of signal relay amplification points may be set according to the distance between the sending node and the receiving node. The specific signal amplification position may be determined according to actual needs.

[0066] Based on the above scheme, when the sending node is far away from the receiving node, signal amplification can be performed at a predetermined position of the transmission path between the sending node and the receiving node to ensure the signal transmission distance and reduce signal interference during signal transmission.

[0067] In one implementation of the first aspect of the present invention, before adjusting the signal power of the signal to be transmitted to the signal power recognizable by the receiving node in step S106, the method further includes the step of acquiring the signal power recognizable by the receiving node from the receiving node in real time.

[0068] In step S106, if the signal power of the signal to be transmitted does not meet the signal power identifiable by the receiving node obtained in real time, the signal power of the signal to be transmitted is adjusted to the signal power identifiable by the receiving node obtained in real time and then transmitted to the receiving node.

[0069] Based on the above scheme, the specific power adjustment can be performed in real time according to the signal power that the receiving node can identify before transmitting to the receiving node. Instead of adapting the receiving node and the power adjustment parameter according to the pre-configured power adjustment parameter, it can be more flexible and more applicable.

[0070] In one embodiment, before performing power detection on the received signal to be transmitted in S103, the following steps are included:

[0071] S1031, obtaining a receiving end signal, and performing power attenuation on the receiving end signal; wherein the receiving end signal includes a noise signal and a signal to be transmitted;

[0072] S1032, performing power attenuation on the receiving end signal according to the power attenuation coefficient;

[0073] S1033, separating the signal to be transmitted from the receiving end signal. Then proceed to S103.

[0074] Based on this scheme, the useful signal to be transmitted is amplified before, and the noise signal is not amplified at this time; and on the receiving node side, the receiving end signal (including the noise signal and the useful signal to be transmitted) is attenuated, so that the noise signal becomes smaller than the useful signal to be transmitted, or even zero, which can further improve the reliability of transmission.

[0075] In one implementation, in S1031, power attenuating the receiving end signal includes:

[0076] The power attenuation coefficient of the receiving end signal is determined according to the signal amplification factor, wherein the signal amplification factor is used when the signal to be transmitted is amplified to a predetermined voltage.

[0077] In one implementation, in S1031, power attenuating the receiving end signal includes:

[0078] When the signal power of the receiving end signal is attenuated, the power is attenuated within the range of the lower limit value and the upper limit value of the signal power that can be recognized by the receiving node.

[0079] In an example, the signal amplification factor is 3, and the power attenuation factor of the receiving end signal is determined to be 3 based on the signal amplification factor. When the receiving end signal is power attenuated, it is attenuated according to the power attenuation factor of 3, and at the same time, the attenuated power is within the range of the lower limit value Pmin and the upper limit value Pma× of the signal power that can be recognized by the receiving node.

[0080] refer to Figure 2In an embodiment of the present invention, it includes a PLC gateway, a first signal amplifier, and a second signal coupler; when the PLC gateway acts as a sending node, the signal to be transmitted sent by the PLC gateway is amplified to a predetermined voltage by the first signal amplifier, and then the second signal coupler couples the amplified signal to be transmitted to the power line for transmission.

[0081] In this embodiment, the PLC gateway side also includes a first power adjustment unit, a first signal coupler, a first control unit, and a first power detector. When the PLC gateway acts as a receiving node, the first signal coupler receives the amplified signal to be transmitted from the power line coupling, and the first power detector detects the signal power of the amplified signal to be transmitted. In this embodiment, the PLC gateway has a processor function, and the first power detector notifies the PLC gateway of the detected signal power. The PLC gateway determines whether the received signal power of the signal to be transmitted meets the recognizable signal power of the PLC gateway, and then notifies the first control unit to control the first power adjustment unit to adjust the power of the signal to be transmitted.

[0082] This embodiment also includes a number of PLC terminal nodes, and each PLC terminal node side also includes a second signal amplifier and a third signal coupler; when the PLC terminal node acts as a sending node, the signal to be transmitted sent by the PLC terminal node is amplified to a predetermined voltage by the second signal amplifier, and then the third signal coupler couples the amplified signal to be transmitted to the power line for transmission.

[0083] On each PLC terminal node side, it also includes a fourth signal coupler, a second power adjustment unit, a second power detector, and a second control unit;

[0084] When the PLC terminal node acts as a receiving node, the fourth signal coupler couples the received signal to be transmitted after amplification from the power line, and the second power detector detects the signal power of the amplified signal to be transmitted. In this embodiment, the PLC terminal node has a processor function, and the second power detector notifies the PLC terminal node of the detected signal power. The PLC terminal node determines whether the power of the received signal to be transmitted meets the signal power recognizable by the PLC terminal node, and then notifies the second control unit to control the second power adjustment unit to adjust the power of the signal to be transmitted.

[0085] exist Figure 2 In an embodiment, when the PLC gateway acts as a receiving node, the signal power of the signal to be transmitted detected by the first power detector is compared with the identifiable signal power of the PLC gateway acquired in real time, so as to determine how to adjust the signal power of the signal to be transmitted input to the PLC gateway.

[0086] When the PLC terminal node acts as a receiving node, the signal power of the signal to be transmitted detected by the second power detector is compared with the identifiable signal power of the PLC terminal node acquired in real time, so as to decide how to adjust the signal power of the signal to be transmitted input to the PLC terminal node.

[0087] refer to Figure 3 In an embodiment of the present invention, it includes a PLC gateway, a first signal amplifier, and a second signal coupler; when the PLC gateway acts as a sending node, the signal to be transmitted sent by the PLC gateway is amplified to a predetermined voltage by the first signal amplifier, and then the second signal coupler couples the amplified signal to be transmitted to the power line for transmission.

[0088] In this embodiment, the PLC gateway side also includes a first automatic gain controller and a first signal coupler. When the PLC gateway acts as a receiving node, the first signal coupler receives the signal to be transmitted after amplification from the power line coupling, and the first automatic gain controller automatically controls the power of the received signal to be transmitted, and outputs a constant power signal to the PLC gateway. Among them, the first automatic gain controller is pre-selected according to demand, and its output is in a fixed power range, which will not change adaptively with the replacement of the connected PLC gateway, that is, it outputs constant power.

[0089] This embodiment also includes a number of PLC terminal nodes, and each PLC terminal node side also includes a second signal amplifier and a third signal coupler; when the PLC terminal node acts as a sending node, the signal to be transmitted sent by the PLC terminal node is amplified to a predetermined voltage by the second signal amplifier, and then the third signal coupler couples the amplified signal to be transmitted to the power line for transmission.

[0090] On each PLC terminal node side, it also includes a fourth signal coupler and a second automatic gain controller; when the PLC terminal node is used as a receiving node, the fourth signal coupler receives the amplified signal to be transmitted from the power line, and the second automatic gain controller performs automatic power control on the received signal to be transmitted, and outputs a constant power signal to the PLC terminal node. The second automatic gain controller is pre-selected according to demand, and its output is in a fixed power range, which will not change adaptively with the change of the connected PLC terminal node, that is, it outputs constant power.

[0091] refer to Figure 4 In a second aspect of the present invention, a power line data transmission system is provided, comprising:

[0092] A first signal amplifier, used to amplify the acquired signal to be transmitted to a predetermined voltage and then couple it to the power line for transmission;

[0093] A first coupler, used for coupling the amplified signal to be transmitted to the power line for transmission;

[0094] A second coupler, used for coupling and receiving a signal to be transmitted;

[0095] A power detector, used for detecting the signal power of the signal to be transmitted;

[0096] A judgment unit, configured to send a power adjustment signal to the power adjuster if the power of the signal to be transmitted does not meet the signal power recognizable by the receiving node;

[0097] The power adjuster is used to adjust the signal power of the signal to be transmitted to the signal power recognizable by the receiving node according to the power adjustment signal, and then transmit it to the receiving node.

[0098] Based on the above scheme, during the data transmission process of the IoT node, the signal to be transmitted of the sending node is amplified to a predetermined voltage and then coupled to the power line for transmission. By amplifying the signal and then transmitting it, the transmission distance can be increased and the signal interference in the network can be reduced. At the same time, on the receiving node side, the amplified signal to be transmitted is coupled from the power line to receive the signal to be transmitted, and dynamic power control is performed to avoid excessive signal power, which affects the power safety of the receiving node, or to avoid too low signal power, which causes the receiving node to be unable to effectively identify the signal to be transmitted. That is, through this scheme, the reliability of data transmission is improved.

[0099] In one implementation of the second aspect of the present invention, if the determination unit determines that the signal power of the signal to be transmitted is less than the signal power recognizable by the receiving node, a signal is sent to the power adjuster to amplify the signal power of the signal to be transmitted to the signal power recognizable by the receiving node;

[0100] If the determination unit determines that the signal power of the signal to be transmitted is greater than the signal power recognizable by the receiving node, a signal is sent to the power adjuster to reduce the signal power of the signal to be transmitted to the signal power recognizable by the receiving node.

[0101] In one embodiment of the second aspect of the present invention, it also includes a second signal amplifier, which is used to relay and amplify the signal to be transmitted at a predetermined position between the sending node and the receiving node before transmitting it through the power line if the distance between the sending node and the receiving node exceeds a preset distance.

[0102] Based on this solution, the communication transmission distance of this system can be improved.

[0103] In one implementation of the second aspect of the present invention, the determination unit is further configured to obtain, from the receiving node in real time, a signal power recognizable by the receiving node;

[0104] The power adjuster adjusts the signal power of the signal to be transmitted to the signal power that is identifiable by the receiving node and is obtained in real time according to the power adjustment signal, and then transmits the signal to the receiving node.

[0105] refer to Figure 5 In one embodiment of the second aspect of the present invention, the power line data transmission system also includes a sending node and a receiving node, wherein the sending node is used to send a signal to be transmitted; and the receiving node is used to receive the signal to be transmitted after power adjustment.

[0106] The third aspect of the present invention provides an Internet of Things system, including: using the power line data transmission method of the first aspect and each embodiment of the present invention to perform data transmission.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0108] 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 data transmission method, characterized in that: include: Obtain the signal to be transmitted from the sending node; Amplifying the signal to be transmitted to a predetermined voltage and coupling it to the power line for transmission; The power of the received signal to be transmitted is detected. If the signal power of the signal to be transmitted does not meet the signal power recognizable by the receiving node, the signal power of the signal to be transmitted is adjusted to the signal power recognizable by the receiving node and then transmitted to the receiving node.

2. The power line data transmission method according to claim 1, characterized in that: The step of adjusting the signal power of the signal to be transmitted to a signal power recognizable by the receiving node includes: If the signal power of the signal to be transmitted is less than the signal power recognizable by the receiving node, amplify the signal power of the signal to be transmitted to the signal power recognizable by the receiving node; If the signal power of the signal to be transmitted is greater than the signal power recognizable by the receiving node, the signal power of the signal to be transmitted is reduced to the signal power recognizable by the receiving node.

3. The power line data transmission method according to claim 1, characterized in that: include: If the distance between the sending node and the receiving node exceeds the preset distance, the power of the signal to be transmitted is relayed and amplified at a predetermined position between the sending node and the receiving node, and then coupled to the power line for transmission.

4. The power line data transmission method according to any one of claims 1 to 3, characterized in that: Before adjusting the signal power of the signal to be transmitted to the signal power recognizable by the receiving node, the step further includes: acquiring the signal power recognizable by the receiving node from the receiving node in real time; If the signal power of the signal to be transmitted does not meet the signal power identifiable by the receiving node obtained in real time, the signal power of the signal to be transmitted is adjusted to the signal power identifiable by the receiving node obtained in real time and then transmitted to the receiving node.

5. The power line data transmission method according to claim 4, characterized in that: Before performing power detection on the received signal to be transmitted, the method includes: Obtaining a receiving end signal and performing power attenuation on the receiving end signal; wherein the receiving end signal includes a noise signal and a signal to be transmitted; A signal to be transmitted is separated from the receiving end signal.

6. The power line data transmission method according to claim 5, characterized in that: The power attenuation of the receiving end signal comprises: The power attenuation coefficient of the receiving end signal is determined according to the signal amplification coefficient, and the power of the receiving end signal is attenuated according to the power attenuation coefficient; wherein the signal amplification coefficient is used when the signal to be transmitted is amplified to a predetermined voltage.

7. The power line data transmission method according to claim 6, characterized in that: The attenuating the signal power of the receiving end signal comprises: When the signal power of the receiving end signal is attenuated, the power is attenuated within the range of the lower limit value and the upper limit value of the signal power that can be recognized by the receiving node.

8. A power line data transmission system, characterized in that: include: A first signal amplifier, used to amplify the acquired signal to be transmitted to a predetermined voltage and then couple it to the power line for transmission; A first coupler, used for coupling the amplified signal to be transmitted to the power line for transmission; A second coupler, used for coupling and receiving a signal to be transmitted; A power detector, used for detecting the signal power of the signal to be transmitted; A judgment unit, configured to send a power adjustment signal to the power adjuster if the signal power of the signal to be transmitted does not meet the signal power recognizable by the receiving node; The power adjuster is used to adjust the signal power of the signal to be transmitted to the signal power recognizable by the receiving node according to the power adjustment signal, and then transmit it to the receiving node.

9. The power line data transmission system according to claim 8, characterized in that: Also includes: A sending node, used to send a signal to be transmitted; The receiving node is used to receive the signal to be transmitted after power adjustment.

10. An Internet of Things system, characterized in that: include: Data transmission is performed using the power line data transmission method according to any one of claims 1 to 4.

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