A data transmission control method and system applied to an alternating current power supply line

Abstract

The application relates to a data transmission control method and system applied to an alternating current power supply line, wherein a data sending module and a data receiving module are added in an existing alternating current power supply line, a near-zero-point cut-off voltage value is set according to power supply quality requirements, when data needs to be sent, alternating current voltage is detected, when the voltage is lower than the set near-zero-point cut-off voltage, the power supply input in the alternating current line is cut off, data is transmitted to the alternating current power supply line without power supply input by the data sending module through a set data modulation mode, and data communication transmission is realized. The application can guarantee that data is cut off and transmitted in the line under the condition of meeting the power supply quality, can reduce data transmission cost, improve data transmission speed, simultaneously reduce power loss, and improve the safety effect when data is transmitted by using an alternating current power supply system.

Description

Technical Field

[0001] This application relates to the field of power electronics and communication technology, and in particular to a data transmission control method and system for AC power supply lines. Background Technology

[0002] AC power supply systems are widely used in production and daily life. In situations where AC power supply systems are used, there are often needs to transmit data for remote monitoring and control, especially with the gradual promotion of IoT applications, leading to an explosive growth in such application scenarios.

[0003] Currently, the most common way to implement power supply systems and data transmission systems is to exist independently. Data transmission systems are implemented using wired, wireless, or a combination of both. In some cases, power lines are used as the carrier for data transmission. Common implementation methods include power line carrier (PLC) and power frequency distortion (TWAC).

[0004] Currently, for power line data transmission, patent document CN106448122A discloses a system and method for directly using power lines to realize data transmission. This patent document controls the conduction or disconnection of the first switch module and the second switch module through an intelligent controller to cut off the alternating current, and realizes data transmission by transmitting a positive half-wave representing 0 and a negative half-wave representing 1.

[0005] Regarding the aforementioned technologies, the inventors believe that the existing data transmission methods, due to limitations in their underlying principles, significantly impact power quality during the data transmission phase and suffer substantial power loss, causing some electrical devices to malfunction. Therefore, further improvements are needed. Summary of the Invention

[0006] In order to achieve a good balance between data transmission performance and cost by reducing power loss while ensuring safe and reliable data transmission, this application provides a data transmission control method and system for AC power supply lines.

[0007] In the first aspect, this application provides a data transmission control method for AC power supply lines, which adopts the following technical solution.

[0008] A data transmission control method for AC power supply lines, the method being applied in AC lines connected to a data transmission module and a data reception module, the method comprising the following steps: The near-zero cutoff voltage value is set according to the power supply quality requirements. By comparing the DC voltage value after rectification and voltage division with the near-zero cutoff voltage value, the time period when the DC voltage value is lower than the near-zero cutoff voltage value is taken as the time period that can be used to transmit data during AC power transmission. When data needs to be sent, disconnect the live wire between the power input terminal and the data transmission module in the AC line during the time period that can be used to transmit data. Based on a preset data modulation method, the raw data to be transmitted is encoded to obtain encoded data; Since the live wire in the AC line is in a cut-off state, the data transmission module transmits the encoded data to the live wire. Since the live wire in the AC line is cut off, the data receiving module acquires the encoded data, decodes the encoded data to obtain the original data, and restores the live wire conduction after the encoded data transmission is completed.

[0009] By adopting the above technical solution, in the AC line connecting the data transmission module and the data reception module, a pre-set near-zero cutoff voltage value is used. When the sampled voltage value is higher than the near-zero cutoff voltage value, the AC power supply line remains in a conducting state to ensure that the power supply quality in the AC line meets the power supply requirements and maintains the working needs of the downstream load. When the sampled voltage value is lower than the near-zero cutoff voltage value, the AC power supply line on the input side is cut off. At this time, the data transmission module relies on the original AC circuit to encode and transmit the original data, and the data reception module decodes the received encoded data to obtain the original data. After the encoded data transmission is completed, the live wire is restored to conduction. The data transmission method adopted in this application does not require a separate data transmission line, has low data transmission and reception costs, can build a data transmission network through existing AC power supply lines, and can easily obtain a high data transmission rate, effectively balancing the significant issue between data transmission and cost.

[0010] Optionally, the step of setting the near-zero cutoff voltage value according to power quality requirements includes: Based on the preset power factor influence value, determine the phase value when the live wire is cut off; Based on the phase value, calculate the cutoff voltage value under different supply voltages; Based on the set power supply voltage fluctuation range, the lowest cutoff voltage value is set as the near-zero cutoff voltage value.

[0011] By adopting the above technical solution, the power output of the AC power used in the AC power supply system changes with the phase of the cutoff point after the power supply is cut off near zero, thus affecting the power quality. By calculating the proportion of the power output power affected by power cutoff at different phases, the power factor impact value caused by the cutoff at different phases can be obtained. After selecting a reasonable power factor impact value for power quality corresponding to data transmission, the allowable phase value for power cutoff can be determined. Once the phase value for power transmission cutoff is determined, the voltage at the cutoff point for lines using different supply voltages is also determined. Combining this with the allowable fluctuation range of the supply voltage, selecting the minimum cutoff voltage value when determining the zero-point cutoff voltage ensures that the output power in lines using various supply voltage types can be effectively controlled to prevent the expected power factor impact value, while also providing time for data transmission.

[0012] Optionally, the step of encoding the original data to be transmitted based on a preset data modulation method to obtain encoded data includes: dividing the original data into groups to obtain multiple data combinations, wherein the data combination includes unit data or multi-bit data.

[0013] By adopting the above technical solution, the original data is grouped and divided during data transmission to ensure data stability during transmission, thereby enabling efficient data transmission.

[0014] Optionally, when the live wire in the AC line is in a cut-off state, the specific method for the data transmission module to transmit the encoded data to the live wire includes: after the live wire enters the cut-off state from the conducting state each time, the data transmission module transmits a set of encoded data to the live wire.

[0015] By adopting the above technical solution, during each time period when the AC voltage is lower than the selected near-zero cutoff voltage value, the AC live wire enters the cutoff state. The data transmission module then sends the raw data to be transmitted in groups to ensure the accuracy of data transmission.

[0016] Optionally, after the live wire transitions from the on state to the off state each time, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is amplitude modulation. Based on the amplitude modulation mapping table, determine the amplitude-coded data set corresponding to the original data; Once the live wire re-enters the cutoff state, the data transmission module transmits a set of amplitude-encoded data to the live wire.

[0017] By adopting the above technical solution, when using amplitude modulation, the original data is mapped into a set of amplitude-coded data composed of different amplitude levels according to the amplitude modulation mapping table. During the data transmission process, when the fire line re-enters the truncation state, the data transmission module transmits a set of amplitude-coded data to the fire line, thereby realizing the encoded transmission of the original data.

[0018] Optionally, after the live wire transitions from the on state to the off state each time, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is time modulation. Based on the time modulation mapping table, determine the time-coded data set corresponding to the original data; Once the fireline re-enters the cutoff state, the data transmission module transmits a set of time-coded data to the fireline.

[0019] By adopting the above technical solution, when using time modulation, the original data is mapped into a time-coded data set composed of signal values ​​of different time lengths according to the time modulation mapping table. During the data transmission process, when the fire line re-enters the truncation state, the data transmission module transmits a set of time-coded data to the fire line, thereby realizing the encoded transmission of the original data.

[0020] Optionally, after the live wire transitions from the on state to the off state each time, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is amplitude-time combined modulation. Based on the amplitude-time joint modulation mapping table, determine the amplitude-time encoded data set corresponding to the original data; Once the fire line is confirmed to have re-entered the cutoff state, the data transmission module will transmit a set of amplitude time-coded data to the fire line.

[0021] By adopting the above technical solution, when using amplitude-time joint modulation, the original data is mapped into an amplitude-time coded data set composed of different amplitudes and time lengths according to the amplitude-time joint modulation mapping table. During data transmission, when the live wire re-enters the truncation state, the data transmission module transmits a set of amplitude-time coded data to the live wire, thereby realizing the encoded transmission of the original data. In the amplitude-time joint modulation process, the number of amplitude-time combinations is large, making it more suitable for situations with a large amount of data.

[0022] Optionally, when the live wire in the AC line is cut off, the data receiving module acquires the encoded data and decodes it to obtain the original data, which includes: Determine the data modulation method selected when sending data; Based on the selected data debugging method, determine the data decoding method; Based on the decoding method, the received encoded data is decoded to obtain the original data.

[0023] By adopting the above technical solution, after the data receiving module receives the encoded data, it uses the data modulation method selected before data encoding to determine the corresponding data decoding method, thereby realizing the fast decoding of the encoded data and obtaining the original data.

[0024] Secondly, this application provides a system that adopts the following technical solution.

[0025] A system comprising: A data center node, which is connected in series to the AC power supply side, is configured to control the on / off of the live wire between the input and output sides of the data center node, and to send raw data in an encoded format when the live wire is cut off. A data terminal node, at least one of which is connected in parallel to the AC power supply line where the data center node is located, is configured to sample the voltage of the power supply line and receive encoded data during the cutoff time, and decode the encoded data in a decoding method corresponding to the encoding.

[0026] By adopting the above technical solution, a one-to-many data transmission network is formed by connecting a data center node in series on the AC power supply side and connecting data terminal nodes in parallel at each required location, eliminating the need for separate data transmission lines and thus reducing costs. After the data center node is connected in series on the AC power supply side, it samples the AC voltage and, based on voltage changes, controls the AC live wire to be cut off when the voltage value is below the near-zero cutoff voltage value. At this time, the original data is transmitted to the live wire for data communication using an encoded format. The data terminal nodes also sample the voltage value on the AC power supply circuit, using the sampled voltage to determine whether the cutoff occurs during a period suitable for data transmission. Simultaneously, they decode the received encoded data on the AC line with the cutoff live wire. By modulating the digital signal output, the data transmission rate is significantly improved.

[0027] Optionally, the data center node includes a first data transmission module, which includes a sampling trigger unit, a first processing unit, a first switching unit, N constant voltage units, and N+1 second switching units. The sampling trigger unit is connected to the AC power supply side and outputs a sampling trigger signal. The first processing unit is connected to the sampling trigger unit. The N+1 second switching units are all connected to the live wire located on the output side of the data center node, and the N+1 second switching units are also connected to the first processing unit. The N constant voltage units are each connected to one of the second switching units, and the N+1 second switching units are connected to the ground wire. The first switching unit is connected in series in the live wire and is connected to the first processing unit. The first processing unit is configured to control the first switching unit to turn off after receiving a low-level active sampling trigger signal, and to transmit data to the live wire using the N+1 second switching units, where N is a positive integer.

[0028] By adopting the above technical solution, before data is transmitted at the data center node, the sampling trigger unit samples the voltage signal. When the voltage is lower than the near-zero cutoff voltage value, the first processing unit controls the first switching unit to cut off the input live wire. After the live wire is cut off, the first processing unit controls N+1 second switching units to control the level and / or duration of the signal input to the AC line, thereby completing the data encoding and transmission.

[0029] Optionally, the first data transmission module further includes a bypass conduction unit, which is connected to the first processing unit and is connected in parallel with the first switching unit; the first processing unit is configured to control the bypass conduction unit to conduct when the first switching unit is turned on.

[0030] By adopting the above technical solution, a bypass conduction unit is connected in parallel between the input and output sides of the first switching unit. When the first processing unit controls the first switching unit to conduct by outputting high and low levels through its port, it also simultaneously controls the bypass conduction unit to switch on, so that most of the current flows through the bypass conduction unit, reducing the power loss caused by the data center node. During periods when data transmission and reception are not required, the bypass module remains in the conducting state, while when data transmission is required, the bypass conduction unit is also in the off state, and it resumes the conducting state after data transmission and reception are completed.

[0031] Optionally, the first data transmission module further includes a discharge unit, which is connected to the first processing unit. The discharge unit is connected in series between the neutral wire and the live wire on the output side of the data center node. The first processing unit is configured to control the discharge unit to maintain conduction for a preset time period after receiving a low-level valid sampling trigger signal.

[0032] By adopting the above technical solution, after the input live wire in front of the data center node is cut off, the live wire and neutral wire of the AC power supply are connected in series by the discharge unit to conduct discharge in the AC line, so as to quickly release the residual electrical energy in the capacitive and inductive loads in the back-end load, reduce the impact on data transmission, and improve the accuracy of data transmission.

[0033] Optionally, the data terminal node includes a first data receiving module, which includes a second processing unit and N sampling comparison units; each of the N sampling comparison units is connected to an AC power supply line and also to the second processing unit; the N sampling comparison units are configured to identify coded data in the AC power supply line, and the second processing unit is configured to decode the coded data to obtain the original data after receiving the coded data identified by the sampling comparison units.

[0034] By adopting the above technical solution, when the data terminal node receives encoded data, N sampling comparison units collect the voltage on the AC power supply line to determine whether data transmission is in progress. After confirming that the live wire in the AC power supply line has been cut off and data transmission has begun, the N sampling comparison units identify the level and duration of the digital signal sent by the receiving data center node, and then uniformly send them to the second processing unit for decoding. This yields the original data. Disconnecting from the AC power supply during the reception process reduces data transmission costs.

[0035] Optionally, the data center node further includes a second data receiving module, and the data terminal node further includes a second data sending module. Both the second data sending module and the second data receiving module are connected to an AC power supply line, and the second data sending module and the second data receiving module are communicatively connected.

[0036] By adopting the above technical solution, a second data receiving module is set up at the data center node, and a second data sending module is set up at the data terminal node, so that a two-way data transmission network is formed between the data center node and the data terminal node on the AC power supply line, increasing the data transmission methods.

[0037] In summary, this application includes at least one of the following beneficial technical effects: 1. The data transmission method adopted in this application does not require a separate data transmission line, has low data transmission and reception costs, can build a data transmission network through existing AC power supply lines, and can easily obtain a high data transmission rate, effectively balancing the significant issues between data transmission and cost.

[0038] 2. Employing multiple data modulation methods makes it easier to achieve higher data transmission rates.

[0039] 3. By connecting a data center node in series on the AC power supply side and connecting data terminal nodes in parallel at each required location, a one-to-many unidirectional or bidirectional data transmission network can be formed, eliminating the need for separate data transmission lines and thus reducing costs.

[0040] 4. It can reduce various interference factors in the line during data transmission, effectively improving the accuracy of data transmission. Attached Figure Description

[0041] Figure 1 This is a system block diagram of a data transmission system applied to an AC power supply line according to an embodiment of this application.

[0042] Figure 2 This is a schematic diagram of a data transmission system applied to an AC power supply line according to an embodiment of this application.

[0043] Figure 3 This is a schematic diagram of a first data transmission module in a data transmission system applied to an AC power supply line, according to an embodiment of this application.

[0044] Figure 4 This is an example circuit diagram of a data transmission system applied to an AC power supply line to implement a voltage sampling trigger function, according to an embodiment of this application.

[0045] Figure 5 This is an example circuit diagram of a data transmission system applied to an AC power supply line according to an embodiment of this application, which realizes the functions of input cutoff, bypass conduction and loop discharge.

[0046] Figure 6 This is an example circuit diagram of a data transmission system applied to an AC power supply line to implement voltage regulation, according to an embodiment of this application.

[0047] Figure 7 This is a schematic diagram of a first data receiving module in a data transmission system applied to an AC power supply line, according to an embodiment of this application.

[0048] Figure 8 This is an example circuit diagram of a data transmission system applied to an AC power supply line according to an embodiment of this application, which implements the data identification and reception function.

[0049] Figure 9 This is a flowchart of a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0050] Figure 10 This is a flowchart illustrating the determination of the near-zero cutoff voltage value in a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0051] Figure 11 This is a diagram showing the relationship between the angle of the cut-off point and the influencing factors of AC power transmission in a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0052] Figure 12 This is a diagram showing the relationship between the angle of the cutoff point and the influencing factor of AC system power transmission when the cutoff is made before 30° in a data transmission method applied to AC power supply lines according to an embodiment of this application.

[0053] Figure 13 This is a schematic diagram of data modulation using amplitude modulation in a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0054] Figure 14 This is a schematic diagram of data modulation using time modulation in a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0055] Figure 15 This is a schematic diagram of data modulation using amplitude-time joint modulation in a data transmission method applied to an AC power supply line according to an embodiment of this application.

[0056] Explanation of reference numerals in the attached figures: 1. Data center node; 11. First data transmission module; 111. Sampling trigger unit; 112. First processing unit; 113. First isolation drive unit; 114. First switching unit; 115. Bypass conduction unit; 116. Second isolation drive unit; 117. Discharge unit; 118. Constant voltage unit; 119. Second switching unit; 12. Second data receiving module; 2. Data terminal node; 21. First data receiving module; 211. Second processing unit; 212. Sampling comparison unit; 22. Second data transmission module. Detailed Implementation

[0057] The following is in conjunction with the appendix Figure 1 -Appendix Figure 15 This application will be described in further detail.

[0058] In the description of this embodiment, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0059] This application discloses a data transmission system applied to AC power supply lines. (Refer to...) Figure 1This system is applied in an AC power supply line and includes a data center node 1 and a data terminal node 2. Data center node 1 is connected in series on the AC power supply side and transmits various data information to the AC power supply line in an encoded manner. The data terminal node is connected in parallel to the AC power supply line where data center node 1 is located. Data terminal node 2 can be configured as one or multiple nodes, depending on the number of AC electrical devices connected to the AC power supply line. Data terminal node 2 identifies and receives the encoded data transmitted by data center node 1 in the AC power supply line, and then decodes the encoded data to obtain the original data.

[0060] In this system, data center node 1 monitors the AC power supply line and, if the set power supply capacity is met, cuts off the live wire on the AC power supply side. During the period when the live wire is cut off, both data center node 1 and data terminal node 2 rely on the cut-off AC input power line for data transmission. The overall system cost is low, and no separate data transmission line is required.

[0061] Reference Figure 2 In constructing a unidirectional data transmission network, data center node 1 includes a first data sending module 11, while data terminal node 2 includes a first data receiving module 21. The first data sending module 11 and the first data receiving module 21 constitute the unidirectional data transmission network. When there are multiple data terminal nodes 2, a one-to-many unidirectional data transmission network is formed.

[0062] When constructing a bidirectional data transmission network, data center node 1 also needs to act as a data receiving terminal, while data terminal node 2 needs to act as a data sending terminal. Therefore, data center node 1 also includes a second data receiving module 12, and data terminal node 2 also includes a second data sending module 22. The second data sending module 22 and the second data receiving module 12 establish a data communication connection, working in conjunction with the unidirectional data transmission network formed by the first data sending module 11 and the first data receiving module 21 to form a bidirectional data transmission network.

[0063] Reference Figure 3The first data transmission module 11 includes a sampling trigger unit 111, a first processing unit 112, a first isolation drive unit 113, a first switching unit 114, a bypass conduction unit 115, a second isolation drive unit 116, a discharge unit 117, a constant voltage unit 118, a second switching unit 119, and a first power processing unit. The sampling trigger unit 111 is connected in series between the live wire and the neutral wire on the AC power supply side. The sampling trigger unit 111 compares the collected voltage value with a preset voltage value inside the sampling trigger unit 111. When the sampled voltage value is lower than a preset near-zero cutoff voltage value, it outputs a sampling trigger signal. The sampling trigger unit 111 is also connected to the first processing unit 112, transmitting the sampling trigger signal to the first processing unit 112.

[0064] The specific working process of the first data transmission module 11 is as follows: the sampling trigger unit 111 compares the collected voltage value with the preset near-zero cutoff voltage value and outputs a low-level valid sampling trigger signal. At this time, the first processing unit 112 controls the first switching unit 114 and the bypass conduction unit 115 to turn off. Then, the first processing unit 112 controls the discharge unit 117 to discharge the AC power supply line. After that, the first processing unit 112 controls the second switching unit 119 to realize the encoded transmission of data.

[0065] Reference Figure 4 ,by Figure 4 Taking the circuit shown as an example: the sampling trigger unit 111 consists of the sixth rectifier bridge D6, the seventeenth comparator U17, the sixteenth optocoupler isolator U16, the fourth Zener diode D4, the eighth Zener diode D8, the Zener chip U18, and multiple resistors.

[0066] The specific working process is as follows: Resistor R20 and resistor R21 are connected in series to form a sampling voltage divider circuit, and resistor R22 and resistor R23 are connected in series to form a reference voltage circuit. After connecting the live wire and neutral wire to the input terminal of the sixth rectifier bridge D6, the sixth rectifier bridge D6 rectifies and outputs DC power. At this time, the sampling voltage divider circuit outputs the sampling voltage value, that is, the sampling voltage value is output at the connection node between resistor R22 and resistor R23.

[0067] The eighth Zener diode D8 regulates and limits the rectified DC voltage, stabilizing the input voltage of the voltage regulator chip U18. The voltage regulator chip U18 then outputs the regulated voltage value. The reference voltage circuit is connected between the output terminal of the voltage regulator chip U18 and the DC negative terminal, and the reference voltage value is output through the connection node between the twenty-second resistor R22 and the twenty-third resistor R23.

[0068] The sampled voltage value is input to one input terminal of the seventeenth comparator U17, while the reference voltage value is input to the other input terminal of the seventeenth comparator U17. The seventeenth comparator U17 outputs a high / low level signal ZCD0 based on the high / low level of the input voltage signal. The high / low level signal ZCD0 output by the seventeenth comparator U17 is electrically isolated by the sixteenth optocoupler U16, and then synchronously forms a high / low signal ZCD. The high / low level signal ZCD is input to the first processing unit 112 for processing. By comparing the high and low levels of the sampled ZCD0 signal, it is determined whether the absolute value of the instantaneous AC voltage is lower than the set near-zero cutoff voltage value. In this embodiment, the near-zero cutoff voltage value is determined by the resistance values ​​of the twentieth resistor R20 and the twenty-first resistor R21.

[0069] In this circuit, the fourth Zener diode D4 and the twenty-first resistor R21 are connected in parallel. When the AC voltage is too high, the fourth Zener diode D4 ensures that the voltage input to the seventeenth comparator U17 is not too large, thus protecting the seventeenth comparator U17. When the AC voltage is lower than the Zener diode D4's regulated voltage, the twentieth resistor R20 and the twenty-first resistor R21 begin to divide the voltage.

[0070] Continue to refer to Figure 3 The first switching unit 114 is connected in series in the live wire, and the bypass conducting unit 115 is connected in parallel with the first switching unit 114. The first isolation driving unit 113 is connected between the first switching unit 114 and the first processing unit 112. Simultaneously, the bypass conducting unit 115 is also connected to the first processing unit 112. When the first processing unit 112 determines that the absolute value of the instantaneous AC voltage is lower than the voltage value set internally by the sampling trigger unit 111, the first processing unit 112 controls the first isolation driving unit 113 to drive the first switching unit 114 to open, and simultaneously controls the bypass conducting unit 115 to open. At this time, the live wire between the input and output sides of data center node 1 is disconnected, meaning there is no AC power input to the AC power supply line at the back end of data center node 1. In this embodiment, the first processing unit 112 is a processing chip with processing capabilities; the specific model of the processing chip is not limited here.

[0071] Discharge unit 117 is connected between the neutral wire and the live wire on the output side of the first switching unit 114, and the second isolation drive unit 116 is connected between discharge unit 117 and the first processing unit 112. When the live wire of the input of data center node 1 is cut off by the first switching unit 114, the first processing unit 112 controls the second isolation unit 116 to drive discharge unit 117 to conduct, thereby realizing the conduction of the live wire and neutral wire on the output side of the first switching unit 114, and discharging the capacitive and inductive loads in the AC power supply line at the back end. Before data transmission, it ensures that there is no residual voltage in the line, improving the accuracy of data transmission.

[0072] Reference Figure 5 ,by Figure 5 Taking the circuit shown as an example: The first isolation drive unit 113 consists of a voltage regulator chip U2, an optocoupler isolator U4, and a MOSFET driver chip U6. The first switching unit 114 consists of a first MOSFET Q1 and a second MOSFET Q2 connected in reverse series. The bypass conduction unit 115 consists of a relay K1 and an eighth MOSFET Q8, where relay K1 is a normally open relay. The second isolation drive unit 116 consists of a voltage regulator chip U3, an optocoupler isolator U5, and a MOSFET driver chip U7. The discharge unit 117 consists of a third MOSFET Q3, a fourth MOSFET Q4, a seventh resistor R7, and a fourth capacitor C4.

[0073] The specific working process is as follows: After the first processing unit 112 determines that the absolute value of the instantaneous voltage in the AC power supply line is lower than the voltage value set by the sampling trigger unit 111, the first processing unit 112 sends a control signal PLMosCtrl to control the first switching unit 114 to turn off, and a control signal RelayBypass to control the bypass conduction unit 115 to turn off. At this time, the PLMosCtrl control signal is isolated by the optocoupler U4, and the isolated signal is transmitted to the MOS transistor driver chip U6. The MOS transistor driver chip U6 controls the first MOS transistor Q1 to turn on, thereby disconnecting the live wire terminal AC_Li connected to the input side of data center node 1 and the live wire terminal AC_Lo connected to the output side of data center node 1. After receiving the low-level RelayBypass control signal, the gate of the eighth MOS transistor enters the off state, the relay K1 stops working and returns to the off state, and finally completely disconnects the live wire terminal AC_Li on the input side of data center node 1 and the live wire terminal AC_Lo on the output side of data center node 1, realizing the cutoff of the live wire input in the AC power supply line.

[0074] After the live wire is cut off, the first processing unit 112 controls the neutral wire AC_No and the live wire AC_Lo at the output side of the first switching unit 114 to conduct and discharge. The first processing unit 112 sends a control signal DLMosCtrl to control the discharge unit 117 to conduct. The control signal DLMosCtrl is isolated by the optocoupler U5 and then transmitted to the MOSFET driver chip U7. The MOSFET driver chip U7 controls the third MOSFET Q3 to conduct, thereby making the live wire AC_Lo and the neutral wire AC_No at the output side of the first switching unit 114 conduct. The seventh resistor R7 and the fourth capacitor C4 form an RC circuit, which is connected in series with the third MOSFET Q3 between the live wire AC_Lo and the neutral wire AC_No. When the live wire AC_Lo and the neutral wire AC_No are conducting, the RC circuit discharges the downstream AC power supply line for a preset time period, thereby achieving rapid discharge of the load in the downstream AC power supply line.

[0075] Continue to refer to Figure 3 There are N constant voltage units 118 and N+1 second switching units 119, where N is a positive integer. Each constant voltage unit 118 is connected to one second switching unit 119, and the (N+1)th second switching unit 119 is connected to the ground wire. The output terminals of the N+1 second switching units 119 are all connected to the live wire located on the output side of the first switching unit 114, and are also connected to the first processing unit 112. The first power processing unit is connected to the AC input side to obtain electrical energy. The first power processing unit outputs DC power and provides energy to the first processing unit 112 and the N constant voltage units 118. The N constant voltage units 118 are used to ensure the stability of the DC voltage input to the live wire. The voltage value output by each constant voltage unit 118 can be the same or different.

[0076] Reference Figure 6 ,by Figure 6 Taking the circuit shown as an example: The constant voltage unit 118 consists of a controllable precision voltage regulator U10, a voltage regulator chip LDO, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The input terminal of the voltage regulator chip LDO is connected to the DC voltage output by the first power processing unit. The controllable precision voltage regulator U10 samples the voltage value between the eleventh resistor R11 and the twelfth resistor R12. The controllable precision voltage regulator U10 outputs different currents to control the final output voltage Vo to a stable state, thus achieving voltage regulation.

[0077] In this embodiment, both the first switching unit 114 and the second switching unit 119 use power switching devices, including but not limited to transistors, MOSFETs, IGBTs, IPM modules, and other similar devices. The first switching unit 114 is controlled by the first processing unit 112 to be in either an on or off state. For the second switching unit 119, the first processing unit 112 outputs PWM control signals with different duty cycles according to a preset control method, thereby controlling different second switching units 119 to have different conduction effects.

[0078] Reference Figure 7 The first data receiving module 21 includes a second processing unit 211 and a sampling comparison unit 212. N sampling comparison units 212 are provided, and each of the N sampling comparison units 212 is connected to an AC power supply line. Simultaneously, the N sampling comparison units 212 are also connected to the second processing unit 211. The sampling comparison units 212 are configured to identify coded data in the AC power supply line. After identifying the coded data, the second processing unit 211 decodes the coded data to obtain the original data.

[0079] Reference Figure 8 ,by Figure 8 Taking the circuit shown as an example: the sampling and comparison unit 212 includes a first rectifier bridge D1, a fifth Zener diode D5, a second comparator U2, a twenty-first optocoupler U21, a Zener chip U1, and multiple resistors, and the second processing unit 211 is a processing chip U20.

[0080] The specific working process is as follows: After the first rectifier bridge D1 rectifies the received AC power, it is divided by resistors R31 and R32, and the divided voltage value is input to one input terminal of the second comparator U2. A stable voltage value is output by the voltage regulator chip U1, and after reference voltage division by resistors R33 and R34, the resulting reference voltage value is input to the other input terminal of the second comparator U2. The second comparator U2 outputs high and low level signals to identify the digital signals in the AC line. The digital signals are input to the second processing unit 211 for data decoding to obtain the original data.

[0081] In this circuit, the fifth Zener diode D5 and the thirty-second resistor R32 are connected in parallel. When the AC voltage is too high, the fifth Zener diode D5 ensures that the voltage input to the second comparator U2 is not too large, thus protecting the second comparator U2. The high and low level signals output by the second comparator U2 are electrically isolated by the third optocoupler isolator U3 before being input to the first processing unit 112 for analysis and processing.

[0082] In this embodiment, the same modules are used for both the first data sending module 11 and the second data sending module 22. Similarly, the same modules are used for both the first data receiving module 21 and the second data receiving module 12, and will not be described in detail here.

[0083] The implementation principle of this application embodiment is as follows: The first data transmission module 11 in data center node 1 includes a sampling trigger unit 111, a first processing unit 112, a first switching unit 114, N constant voltage units 118, and N+1 second switching units 119. The first processing unit 112 controls the power supply line through controllable semiconductor power devices to connect the first switching unit 114 on the live wire of the power supply line when data transmission is not required, so that AC power is input. When data needs to be transmitted, the sampling trigger unit 111 detects the input AC voltage. When the voltage difference between the live wire and the neutral wire is less than the selected near-zero cutoff voltage value, the first switching unit 114 is controlled to disconnect the live wire input during the period when the voltage difference is less than the near-zero cutoff voltage value. The first processing unit 112 controls the N+1 second switching units 119 to be turned on or off, so that the voltage sources connected to the live wire are different in time, forming digital signals for transmission. When the voltage difference between the input live wire and the neutral wire rises back to a value greater than the near-zero cutoff voltage value, the connection between the input live wire and the output live wire is restored, realizing normal power supply.

[0084] This application also discloses a data transmission control method applied to AC power supply lines. (Refer to...) Figure 9 The method includes the following steps.

[0085] S1. Set the near-zero cutoff voltage value according to the power supply quality requirements. By comparing the DC voltage value after rectification and voltage division with the near-zero cutoff voltage value, the time period when the DC voltage value is lower than the near-zero cutoff voltage value is taken as the time period that can be used to transmit data during AC power transmission.

[0086] The near-zero cutoff voltage value is the DC voltage value that causes the sampling trigger unit 111 to output a sampling trigger signal when the input AC power is cut off by data center node 1. After the AC power is rectified by the sampling trigger unit 111 of data center node 1, the set near-zero cutoff voltage value and the sampled real-time voltage value are compared, and the time interval after the AC power is cut off is obtained using the high and low level signals output by the sampling trigger unit 111.

[0087] Reference Figure 10 Step S1 includes the following steps.

[0088] S11. Based on the preset power factor influence value, determine the phase value when the live wire is cut off.

[0089] When the live wire in an AC power supply line is cut off, the entire AC power supply line's function of providing AC power is hindered. Therefore, when a power device cuts off the live wire, it will inevitably have a certain impact on the power supply quality at the downstream end of the power supply line.

[0090] Choosing different near-zero cutoff voltage values ​​will alter the turn-off time of power devices in the live wire, thus affecting power quality. An important metric for measuring power quality is the power factor (PF). In AC power lines, the power output... For the power factor, U p Here, R is the unidirectional peak voltage, and R is the equivalent load resistance at the downstream end. When the live wire is cut off at any phase ω (0 < ω < π), the final total output power is...

[0091] For an ideal sinusoidal power supply with a power factor of 1, i.e. If the value is 1, then the total output power is...

[0092] Since the alternating current is rectified to form direct current, two symmetrical sinusoidal half-waves are formed in the 0–2π interval. When the 0–ω interval is truncated, the π–ω interval is also truncated. Energy transfer between, or from 0 to Energy transfer between them. Therefore, when analyzing the rectified voltage after it is cut off, it can be done according to four... The analysis is performed within the interval (at this time). When less than The power factor effect caused by power transmission when the voltage of a certain phase ω is cut off. Simplify the integral result as follows:

[0093] The graph showing the relationship between the power factor influence value α and the angle corresponding to the phase ω is as follows: Figure 11 As shown in the figure. The horizontal axis represents angle, and the vertical axis represents the power factor influence value. Combined with... Figure 12 It can be seen that as the angle corresponding to phase ω increases, the power factor influence value α gradually increases.

[0094] For example, such as Figure 12 As shown, when the preset power factor influence value is 1%, the determined angle is 16.5°, or the phase is 0.09167π. When the preset power factor influence value is 0.5%, the determined angle is 13.08°, or the phase is 0.07257π. Therefore, after determining a suitable power factor influence value, the phase value when the live wire is cut off can be determined.

[0095] S12. Based on the phase value, calculate the cutoff voltage value under different supply voltages.

[0096] In AC power supply lines, different supply voltage values ​​may be used. Different supply voltage values ​​require different voltages to trigger the cutting off of the live wire when sampled by the sampling trigger unit 111. Table 1 shows the cutoff voltages corresponding to a power factor influence of 1% and 0.5% for sinusoidal supply voltages with effective values ​​of 100V, 110V, 120V, 220V, 230V, and 240V.

[0097] Table 1 Cutoff voltages for different effective supply voltages under different power factor influence values 100V 40.1V 32.0V 110V 44.1V 35.2V 120V 48.2V 38.4V 220V 88.3V 70.4V 230V 92.3V 73.6V 240V 96.3V 76.8V S13. Based on the set power supply voltage fluctuation range, set the lowest cutoff voltage value as the near-zero cutoff voltage value.

[0098] Considering the potential voltage fluctuation range in the AC power supply system, the near-zero cutoff voltage value must be set such that triggering can occur even when the sampled voltage is below the specified value. Therefore, the selected cutoff voltage is the lowest voltage value. Taking Table 1 as an example, at a cutoff phase of 0.07267π (i.e., 13.08°), the selected voltage value is 32.0V. Under the influence of a voltage fluctuation range of ±20%, the final determined near-zero cutoff voltage value is 32*(1-20%) = 25.6V.

[0099] S2. When data needs to be sent, disconnect the live wire between the power input terminal and the data transmission module in the AC line during the time period available for data transmission.

[0100] When the sampled DC voltage value is lower than the near-zero cutoff voltage value, it means that the power factor impact caused by cutting off the AC power does not exceed the preset power factor impact value. Cutting off the AC power at this time can maximize the quality of AC power supply.

[0101] S3. Based on the preset data modulation method, the original data to be transmitted is encoded to obtain encoded data.

[0102] Before transmitting the raw data, the raw data is grouped and divided into multiple data combinations, each including a single data unit or multiple bits of data. The encoded data processed by the first processing unit 112 is binary data. When the live wire of the AC power supply line is cut off, the encoded data combinations are transmitted by N constant voltage units 118 and N+1 second switching units 119 using the area where the live wire is cut off.

[0103] Step S3 includes the following steps.

[0104] S31. Determine that the selected data modulation method is amplitude modulation.

[0105] S32. Based on the amplitude modulation mapping table, determine the amplitude coded data set corresponding to the original data.

[0106] S33. Confirm that the live wire has re-entered the cutoff state, and the data transmission module will transmit a set of amplitude encoded data to the live wire.

[0107] During the time interval when the live wire is cut off, the voltage on the live wire drops to zero after the AC power supply line is discharged. Therefore, during the time interval when the live wire is cut off, the first processing unit 112 can control N+1 second switching units 119 to be turned on or off, thereby outputting high / low level signals. By mapping the high and low levels of the level signals to binary logic data, the encoded data is transmitted to the live wire in the form of digital signal amplitude.

[0108] Specifically, the correspondence between level signals and logic data is shown in Table 2 below.

[0109] Table 2 Amplitude Modulation Mapping Table 0 0 T1 1 V1 T1 In Table 2, the value of T1 is limited by the equivalent capacitance and equivalent inductance that the power supply output line needs to drive in the actual application circuit, and it is necessary to ensure that all changes in the level can be accurately detected by the first data receiving module 21. At the same time, T1 should not exceed the length of time that the first data transmitting module 11 disconnects the input live wire.

[0110] Reference Figure 13 For the first data receiving module 21, the voltage on the AC power supply line is sampled by the sampling comparison unit 212, and the voltage is analyzed and processed. When the live wire in the AC power supply line is not cut off, the voltage value collected by the sampling comparison unit 212 is higher than the set comparison voltage value, and the sampling comparison unit 212 outputs a high level.

[0111] When the live wire in the AC power supply line is cut off, if the output of the second switch unit 119 is a low-level signal, the signal value collected by the sampling comparison unit 212 will also be low-level. If the output of the second switch unit 119 is a high-level signal, the signal value collected by the sampling comparison unit 212 will be high-level, thus identifying the logic data corresponding to the original data during transmission.

[0112] S34. Determine that the selected data modulation method is time modulation.

[0113] S35. Based on the time modulation mapping table, determine the time-coded data set corresponding to the original data.

[0114] S36. Confirm that the fire line has re-entered the cut-off state, and the data transmission module will transmit a set of time-coded data to the fire line.

[0115] Similarly, during the time interval when the live wire is cut off, the duration of the time that the first processing unit 112 controls the N+1 second switching units 119 to be turned on or off can be matched with binary logic data, thereby transmitting the encoded data to the live wire in the form of digital signal amplitude.

[0116] Specifically, the correspondence between the duration of the signal and the logic data is shown in Table 3 below.

[0117] Table 3 Time Modulation Mapping Table 00 0 T1 01 0 T0+T1 10 0 T0+2*T1 11 0 T0+3*T1 In Table 3, the durations T0 to T0+3*T1 must also ensure that the 0 level can be accurately detected by the first data receiving module 21. At the same time, the duration difference T1 should be ensured to be accurately detected and distinguished by the first data receiving module 21.

[0118] Reference Figure 14 For the first data receiving module 21, the voltage on the AC power supply line is sampled by the sampling comparison unit 212, and the voltage level is identified and triggered. When the live wire in the AC power supply line is not cut off, the voltage value collected by the sampling comparison unit 212 is higher than the set comparison voltage value, and the sampling comparison unit 212 outputs a high level, which can determine that no data transmission is being performed at this time.

[0119] After the live wire in the AC power supply line is cut off, a low-level signal is output through the second switching unit 119. The signal value collected by the sampling and comparison unit 212 is also low, thus identifying the data transmission process. After identifying the data transmission, the duration of the low-level signal is used to determine the logic data corresponding to signals of different durations.

[0120] S37. The selected data modulation method is amplitude-time combined modulation. S38. Based on the amplitude-time joint modulation mapping table, determine the amplitude-time encoded data set corresponding to the original data; S39. Confirm that the live wire has re-entered the cutoff state, and the data transmission module will transmit a set of amplitude time-coded data to the live wire.

[0121] Similarly, during the time interval when the live wire is cut off, the first processing unit 112 can control the on or off states of N+1 second switching units 119, as well as the duration of the state, to perform joint modulation and form a joint modulation signal. The joint modulation signal is then mapped to binary logic data, thereby transmitting the encoded data to the live wire in the form of a digital signal amplitude.

[0122] Specifically, the correspondence between the joint modulation signal and the logic data is shown in Table 4 below.

[0123] Table 4 Amplitude-Time Joint Modulation Mapping Table 00 0 T0 01 0 T0+T1 10 V1 T0 11 V1 T0+T1 In Table 4, the durations T0 to T0+T1 must also ensure that the 0 level and V1 can be accurately detected by the first data receiving module 21, V1 is less than the high level value V0, and V1 is greater than 0, and can be accurately distinguished by the first receiving module. At the same time, the duration difference T1 should be ensured to be accurately detected and distinguished by the first data receiving module 21.

[0124] Reference Figure 15 For the first data receiving module 21, two sampling comparison units 212 sample the voltage and duration values ​​on the AC power supply line respectively, and identify and trigger the logic value. When the live wire in the AC power supply line is not cut off, the voltage value collected by the sampling comparison unit 212 is higher than the set comparison voltage value. The sampling comparison unit 212 outputs a high level and there is no sampling time, indicating that there is no data transmission.

[0125] When there is a sampling time, the logical value data is determined by combining the sampling time and the amplitude determined during sampling.

[0126] In this embodiment, when the control accuracy of the level and duration of the digital signal transmitted by the first data transmission module 11 is satisfied, and when the detection accuracy of the level and duration of the digital signal received by the first data receiving module 21 is satisfied, the above three modulation methods can be used to achieve higher data transmission and reception speed with more symbol combinations during each time interval when the absolute level of the AC power supply is less than the near-zero cutoff voltage value.

[0127] S4. Since the live wire in the AC line is in a cut-off state, the data transmission module transmits the encoded data to the live wire.

[0128] Specifically, after the fire line transitions from the conducting state to the cut-off state each time, the data sending module transmits a set of coded data to the fire line.

[0129] S5. Based on the fact that the live wire in the AC line is cut off, the data receiving module obtains the encoded data, decodes the encoded data to obtain the original data, and restores the live wire conduction after the encoded data transmission is completed.

[0130] S51. Determine the data modulation method to be selected when transmitting data.

[0131] S52. Based on the selected data debugging method, determine the data decoding method.

[0132] S53. Based on the decoding method, decode the received encoded data to obtain the original data.

[0133] The data decoding process uses a method corresponding to the modulation method used in the data encoding process, thereby decoding the received and identified logical data to form the original data. After the encoded data transmission is completed, the AC power supply line can continue to transmit power by restoring the live wire, thus meeting the power quality requirements.

[0134] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A data transmission control method applied to AC power supply lines, characterized in that, The method is applied in an AC line connected to a data transmission module and a data reception module, and the method includes the following steps: The near-zero cutoff voltage value is set according to the power quality requirements. The maximum allowable cutoff phase angle ω is determined by integrating the preset power factor influence value α. Then, based on ω, the DC voltage value after rectification and voltage division is compared with the near-zero cutoff voltage value. The time period when the DC voltage value is lower than the near-zero cutoff voltage value is used as the time period that can be used to transmit data during AC power transmission. When data needs to be sent, disconnect the live wire between the power input terminal and the data transmission module in the AC line during the time period that can be used to transmit data. Based on a preset data modulation method, the raw data to be transmitted is encoded to obtain encoded data; Since the live wire in the AC line is in a cut-off state, the data transmission module transmits the encoded data to the live wire. The data transmission module injects at least two voltage signals of different amplitudes into the live wire through at least one constant voltage unit to form an encoded signal containing two dimensions of amplitude and duration on the live wire. Since the live wire in the AC line is cut off, the data receiving module acquires the encoded data, decodes the encoded data to obtain the original data, and restores the live wire conduction after the encoded data transmission is completed.

2. The data transmission control method according to claim 1, characterized in that, The step of setting the near-zero cutoff voltage value according to power quality requirements includes: Based on the preset power factor influence value, determine the phase value when the live wire is cut off; Based on the phase value, calculate the cutoff voltage value under different supply voltages; Based on the set power supply voltage fluctuation range, the lowest cutoff voltage value is set as the near-zero cutoff voltage value.

3. The data transmission control method according to claim 1, characterized in that, The step of encoding the raw data to be transmitted based on a preset data modulation method to obtain encoded data includes: dividing the raw data into groups to obtain multiple data combinations, wherein the data combination includes unit data or multi-bit data.

4. The data transmission control method according to claim 3, characterized in that, The specific method for transmitting encoded data to the live wire in an AC line when the live wire is in a cut-off state includes: after the live wire changes from a conducting state to a cut-off state each time, the data transmitting module transmits a set of encoded data to the live wire.

5. The data transmission control method according to claim 4, characterized in that, Each time the live wire transitions from the on state to the off state, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is amplitude modulation. Based on the amplitude modulation mapping table, determine the amplitude-coded data set corresponding to the original data; Once the live wire re-enters the cutoff state, the data transmission module transmits a set of amplitude-encoded data to the live wire.

6. The data transmission control method according to claim 4, characterized in that, Each time the live wire transitions from the on state to the off state, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is time modulation. Based on the time modulation mapping table, determine the time-coded data set corresponding to the original data; Once the fireline re-enters the cutoff state, the data transmission module transmits a set of time-coded data to the fireline.

7. The data transmission control method according to claim 4, characterized in that, Each time the live wire transitions from the on state to the off state, the data transmission module transmits a set of coded data to the live wire, specifically including: The selected data modulation method is amplitude-time combined modulation. Based on the amplitude-time joint modulation mapping table, determine the amplitude-time encoded data set corresponding to the original data; Once the fire line is confirmed to have re-entered the cutoff state, the data transmission module will transmit a set of amplitude time-coded data to the fire line.

8. The data transmission control method according to claim 1, characterized in that, When the live wire in the AC line is cut off, the data receiving module acquires the encoded data and decodes it to obtain the original data, which includes: Determine the data modulation method selected when sending data; Based on the selected data debugging method, determine the data decoding method; Based on the decoding method, the received encoded data is decoded to obtain the original data.

9. A system applied to AC power supply lines, characterized in that, A data transmission control method for an AC power supply line as described in any one of claims 1-8, the system comprising: A data center node (1) is connected in series to the AC power supply side. The data center node (1) is configured to: set a near-zero cutoff voltage value V0 according to power quality requirements, wherein the near-zero cutoff voltage value V0 is determined by integrating a preset power factor influence value α to determine the maximum allowable cutoff phase angle ω, and then determined according to ω; compare the rectified DC voltage value with the near-zero cutoff voltage value V0, and use the time period when the DC voltage value is lower than the near-zero cutoff voltage value V0 as the time period that can be used for data transmission during AC power transmission, and control the connection between the input side and the output side of the data center node (1). The live wire is switched on and off, and the original data is sent in an encoded format when the live wire is cut off. At least two voltage signals of different amplitudes are injected into the live wire through at least one constant voltage unit to form an encoded signal containing two dimensions of amplitude and duration on the live wire, thereby sending the original data in an encoded format; data terminal node (2), at least one data terminal node (2), the data terminal node (2) is connected in parallel to the AC power supply line where the data center node (1) is located, the data terminal node (2) is configured to sample the voltage of the power supply line, receive encoded data during the cut-off time of the live wire, and decode the encoded data in a decoding method corresponding to the encoding.

10. The system according to claim 9, characterized in that: The data center node (1) includes a first data transmission module (11), which includes a sampling trigger unit (111), a first processing unit (112), a first isolation drive unit (113), a first switching unit (114), N constant voltage units (118), and N+1 second switching units (119). The sampling trigger unit (111) is connected to the AC power supply side and outputs a sampling trigger signal. The first processing unit (112) is connected to the sampling trigger unit (111). The first switching unit (114) is connected in series in the live wire, and the first isolation drive unit (113) is connected between the first switching unit (114) and the first... The processing unit (112) is connected to the first processing unit (112); N+1 second switching units (119) are all connected to the live wire located on the output side of the first switching unit (114), and N+1 second switching units (119) are also connected to the first processing unit (112); N constant voltage units (118) are respectively connected to one second switching unit (119), and the N+1th second switching unit (119) is connected to the ground wire; the first processing unit (112) is configured to control the first switching unit (114) to turn off after receiving a low-level valid sampling trigger signal, and use N+1 second switching units (119) to transmit data to the live wire, where N is a positive integer.

11. The system according to claim 10, characterized in that: The first data transmission module (11) further includes a bypass conduction unit (115), which is connected to the first processing unit (112) and is connected in parallel with the first switching unit (114); the first processing unit (112) is configured to control the bypass conduction unit (115) to conduct when the first switching unit (114) is turned on.

12. The system according to claim 10, characterized in that: The first data transmission module (11) further includes a second isolation drive unit (116) and a discharge unit (117). The second isolation drive unit (116) is connected between the discharge unit (117) and the first processing unit (112). The discharge unit (117) is connected in series between the neutral line and the live line on the output side of the first switching unit (114). The first processing unit (112) is configured to control the discharge unit (117) to maintain conduction for a preset time period after receiving a low-level valid sampling trigger signal.

13. The system according to claim 10, characterized in that: The data terminal node (2) includes a first data receiving module (21), which includes a second processing unit (211) and N sampling comparison units (212). The N sampling comparison units (212) are all connected to the AC power supply line and are also connected to the second processing unit (211). The N sampling comparison units (212) are configured to identify coded data in the AC power supply line. The second processing unit (211) is configured to decode the coded data after receiving the coded data identified by the sampling comparison unit (212) to obtain the original data.

14. The system according to claim 9, characterized in that: The data center node (1) further includes a second data receiving module (12), and the data terminal node (2) further includes a second data sending module (22). Both the second data sending module (22) and the second data receiving module (12) are connected to the AC power supply line, and the second data sending module (22) and the second data receiving module (12) are communicatively connected.

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