A bidirectional carrier communication module

Abstract

The utility model discloses a kind of two-way carrier communication module, belong to power line carrier communication technical field.The module is connected between main station and terminal by power line, including control module, carrier communication module and interface module;Among them, carrier communication module and interface module are connected with control module respectively;Carrier communication module includes receiving demodulation unit and sending modulation unit;High-frequency carrier signal from main station is received by receiving demodulation unit and is demodulated as digital signal and then transmitted to control module, again by control module and interface module is sent to terminal;Response data from terminal is transmitted to sending modulation unit by interface module and control module, and sending modulation unit modulates response data as high-frequency carrier signal, and is returned to main station by power line.The module breaks through traditional one-way communication limit, realizes strong two-way interaction ability, and is suitable for power monitoring and other main station and terminal data interaction scene.

Description

Technical Field

[0001] This utility model relates to the field of power line carrier communication technology, and in particular to a bidirectional carrier communication module. Background Technology

[0002] In fields such as remote monitoring of power systems and condition monitoring of industrial equipment, carrier communication technology has been widely used because it can directly utilize existing lines as the transmission medium without the need for additional wiring. Its technological foundation stems from early power line carrier communication (PLC) and one-way radio broadcasting technology. PLC achieves data transmission by loading high-frequency carrier signals onto power lines, initially primarily used in scenarios such as remote meter reading in the power grid (e.g., electricity meter reading acquisition). One-way broadcasting systems, typified by radio broadcasting and aviation navigation beacons, maintain high reliability in specific fields due to their characteristic of transmitting fixed information in only one direction and requiring no feedback from the receiving end. Simultaneously, the demand for low-cost, low-power remote signal transmission in industrial control scenarios such as oil pipeline monitoring and power grid fault alarms has further driven the application of this type of carrier communication technology.

[0003] However, existing carrier communication technologies still have significant limitations. On the one hand, traditional solutions are mostly one-way transmission modes, only enabling the master station to send fixed commands to the terminal or the terminal to send data to the master station. They cannot achieve bidirectional interaction between the master station and the terminal, making it difficult to meet the needs of complex scenarios requiring command confirmation and dynamic parameter adjustment. On the other hand, due to issues such as load changes and noise interference in power lines, the channel environment is relatively complex. Existing technologies have insufficient anti-interference capabilities, which can easily lead to signal attenuation or distortion, thereby affecting the transmission distance and data transmission stability. This limits their application in complex environments such as rural areas and areas with difficult wiring, and there is an urgent need to improve the technology to optimize noise resistance and overcome the limitations of one-way transmission. Utility Model Content

[0004] The purpose of this invention is to provide a bidirectional carrier communication module to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides a two-way carrier communication module, which is connected between the master station and the terminal via a power line, and includes a control module, a carrier communication module, and an interface module; wherein the carrier communication module and the interface module are respectively connected to the control module;

[0006] The carrier communication module includes a receiving demodulation unit and a transmitting modulation unit. The high-frequency carrier signal from the master station is received by the receiving demodulation unit, demodulated into a digital signal, and then transmitted to the control module. The control module and the interface module then transmit the signal to the terminal. The response data from the terminal is transmitted to the transmitting modulation unit through the interface module and the control module. The transmitting modulation unit modulates the response data into a high-frequency carrier signal and transmits it back to the master station via the power line.

[0007] Furthermore, the bidirectional carrier communication module also includes a storage module and a power supply module; the storage module is used to store interactive data and operating parameters, and the power supply module supplies power to the control module, carrier communication module, interface module and storage module.

[0008] Furthermore, in the bidirectional carrier communication module, the interface module includes an uplink channel interface circuit and a meter reading and data collection circuit; the uplink channel interface circuit is used to realize signal transmission between the control module and the master station; the meter reading and data collection circuit is used to connect the terminal and transmit data including collected data and status information.

[0009] Furthermore, in the bidirectional carrier communication module, the storage module is a FLASH memory circuit used to store various data, operating parameters, and communication protocol information processed by the control module.

[0010] Furthermore, the bidirectional carrier communication module also includes an AC sampling module connected to the control module, which is used to collect AC parameters of the power line and transmit them to the control module.

[0011] Furthermore, the bidirectional carrier communication module also includes a button driving circuit and a display unit, which are respectively connected to the control module; the button driving circuit is used to receive external input commands and transmit them to the control module, and the display unit is used to display data information.

[0012] Furthermore, the bidirectional carrier communication module also includes a GPRS module connected to the control module, which is used to realize wireless data interaction with external devices.

[0013] Furthermore, in the bidirectional carrier communication module, the protocol conversion function of the control module includes converting the communication protocol of the master station into a protocol adapted to the terminal, or converting the communication protocol of the terminal into a protocol adapted to the master station.

[0014] Furthermore, in the bidirectional carrier communication module, the control unit integrates an anti-interference mechanism, including data error correction and retransmission functions, to ensure data integrity when power line noise causes signal distortion.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] By cooperating with the receiving and demodulation unit and the transmitting and modulation unit of the carrier communication module, and combined with the signal processing and data interaction logic control of the control module, bidirectional data transmission between the master station and the terminal based on power lines can be achieved, meeting the closed-loop requirements of command issuance and response feedback. Simultaneously, the newly added button drive circuit and display unit provide convenient local human-machine interaction functions, facilitating on-site personnel to input commands and view data information, thus solving the problem of traditional systems lacking on-site operation and status visualization. The protocol conversion function of the control module improves compatibility with different communication protocols, and the reliable storage of interactive data and operating parameters by the storage module ensures data continuity. Furthermore, the stable power supply of the power module and the collaborative work of each module enhance the stability of system operation, and by utilizing the existing power line network directly without additional wiring, infrastructure investment is reduced. Significant improvements are made in interactive capabilities, on-site operability, compatibility, and economy, making it more suitable for complex scenarios such as power monitoring and industrial monitoring. Attached Figure Description

[0017] Figure 1 This is a logic flowchart of a bidirectional carrier communication module between a master station and a terminal in one embodiment of this utility model;

[0018] Figure 2 This is a functional block diagram of a bidirectional carrier communication module in one embodiment of this utility model. Detailed Implementation

[0019] The following is a more detailed description of a bidirectional carrier communication module of the present invention with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0020] For clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not detailed in detail, as they would confuse the present invention with unnecessary detail. It should be understood that in the development of any actual embodiment, numerous implementation details must be made to achieve the developer's specific goals, such as changes from one embodiment to another according to limitations related to the system or business. Furthermore, it should be understood that such development work may be complex and time-consuming, but is merely routine work for those skilled in the art.

[0021] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0022] Based on the teachings of this specification, those skilled in the art can form new technical solutions by combining different implementation methods without creating technical contradictions. Such variations should be considered to fall within the protection scope of this application.

[0023] like Figure 1 As shown, this embodiment proposes a bidirectional carrier communication module to solve the above-mentioned problems. The module includes a control module, a carrier communication module, and an interface module. The carrier communication module and the interface module are respectively connected to the control module.

[0024] The carrier communication module includes a receiving demodulation unit and a transmitting modulation unit. This embodiment uses the PLCS1643 chip as an example. The high-frequency carrier signal from the master station is received by the receiving demodulation unit, demodulated into a digital signal, and then transmitted to the control module. The control module and the interface module then transmit the signal to the terminal. In this embodiment, the receiving demodulation unit includes a signal receiving circuit, a preamplifier, a bandpass filter, and a demodulation circuit. During operation, it receives a 40-500kHz high-frequency carrier signal from the power line through a coupling capacitor. After amplification by the preamplifier, noise interference is filtered out by the bandpass filter, and the high-frequency signal is converted into a digital signal by the demodulation circuit. Response data from the terminal is transmitted to the transmitting modulation unit through the interface module and the control module. The transmitting modulation unit modulates the response data into a high-frequency carrier signal and transmits it back to the master station via the power line. In this embodiment, the transmission modulation unit comprises a modulation circuit, a power amplifier, and a signal transmission circuit. It can convert digital signals such as meter readings and equipment status information output by the control module into high-frequency carrier signals through ASK or FSK modulation, amplify them through the power amplifier, and then transmit them back to the main station to realize a two-way carrier communication closed loop.

[0025] The control module uses a high-performance MCU (such as STMicroelectronics' STM32F103 series microcontroller) as its core processor for signal processing, control data interaction logic, and protocol conversion. The MCU integrates multiple communication interfaces to efficiently process digital signals transmitted by the carrier communication module. Specific functions of the control module include: receiving and processing digital signals transmitted by the receiving demodulation unit, and sending the processed signal to the terminal through the interface module; receiving response data from the terminal through the interface module, processing the response data, and transmitting it to the transmitting modulation unit to achieve bidirectional data communication between the master station and the terminal. Additionally, its built-in protocol conversion logic can convert the DL / T 645 protocol used by the master station to a protocol supported by the terminal (such as Modbus), or convert the terminal's communication protocol to a protocol adapted to the master station. Simultaneously, the control module integrates an anti-interference mechanism, including data error correction and retransmission functions. When power line noise causes signal distortion, it can automatically detect errors and trigger retransmission to ensure data integrity.

[0026] Furthermore, the interface module is used to connect to the terminal and realize data transmission between the control module and the terminal. Specifically, the interface module includes an uplink channel interface circuit and a meter reading and data acquisition circuit. The uplink channel interface circuit adopts an RS-485 circuit to assist in the signal transmission between the control module and the master station. The meter reading and data acquisition circuit is also based on the RS-485 standard, connecting terminals such as electricity meters and data acquisition devices, and transmitting the terminal's collected data (such as electricity consumption, voltage, current, and power) and status information (such as switch position and fault codes).

[0027] The storage module uses a FLASH memory circuit (such as the W25Q64 chip) to store various key information required for the module's operation, including operating parameters (communication frequency, baud rate, power settings, etc.), historical meter reading records, protocol conversion rules, and device operation logs (system startup time, abnormal events, etc.), ensuring that data is not lost when power is off.

[0028] like Figure 2 As shown, this module includes an AC sampling module connected to the control module. The AC sampling module collects AC parameters of the power line and transmits them to the control module. In this embodiment, the AC sampling module uses a voltage transformer, a current sensor, and a 16-bit ADC chip to collect parameters such as voltage, current, and power of the power line in real time. It updates these parameters every predetermined time interval (e.g., 100ms) and transmits them to the control module for the main station to monitor power quality.

[0029] Furthermore, the module includes a key drive circuit and a display unit connected to the control module; the key drive circuit receives external input commands and transmits them to the control module, while the display unit displays data information. In this embodiment, the key drive circuit uses a 4×4 matrix keypad to receive debugging commands from on-site personnel (such as manually triggering meter reading) and send them to the control module. The display unit is equipped with a 128×64 dot matrix OLED screen to display the current communication status, power parameters, and terminal data in real time, enabling local human-computer interaction.

[0030] Furthermore, the module includes a GPRS module connected to the control module, which is used to realize wireless data interaction with external devices. The GPRS module serves as a backup communication channel, automatically switching to wireless transmission when the power line carrier signal is severely interfered with (e.g., the bit error rate exceeds 5%), ensuring reliable transmission of emergency data (such as fault alarms).

[0031] When the module is working, the process is as follows: The master station's commands are transmitted to the carrier communication module via the power line. After being demodulated by the receiving demodulation unit, they are sent to the control module for processing. The control module converts the protocol and sends the data to the terminal through the interface module. The terminal's response data is transmitted back to the control module through the interface module. After processing, it is modulated into a carrier signal by the transmitting modulation unit and transmitted back to the master station. At the same time, the data is recorded by the storage module. The power parameters of the AC sampling module and the commands input by the buttons are all processed by the control module. When necessary, they are displayed through the display unit or transmitted through the GPRS module. The anti-interference mechanism of the control module ensures the accuracy of the data throughout the process, and finally realizes efficient two-way communication between the master station and the terminal.

[0032] Specifically, in the master station command issuance phase: the master station (such as a power company server) generates commands based on monitoring needs (such as real-time meter reading and parameter configuration) and transmits the commands to the terminal via the power line. The receiving and demodulation unit of the carrier communication module captures the high-frequency carrier signal through a coupling circuit. It first filters out low-frequency noise (such as motor starting interference) in the power line using a bandpass filter, then amplifies the weak signal using a preamplifier, and finally demodulates it into a binary digital signal, which is then transmitted to the control module (STM32 series MCU). The control module first performs a CRC check on the digital signal. If the check passes, it parses the command content; if the check fails (due to signal distortion caused by noise), it immediately triggers a retransmission mechanism, sending a retransmission request to the master station until the complete command is received. After parsing, the control module initiates a protocol conversion function, converting the DL / T 645 protocol command into the Modbus protocol supported by the terminal, and then sends it to the terminal through the meter reading and data acquisition circuit (RS-485 interface) of the interface module. During command transmission, the storage module (FLASH memory) synchronously records the command content, transmission time, and target terminal address for subsequent traceability.

[0033] Terminal Response and Feedback Phase: After receiving the instruction, the terminal executes the corresponding operation (such as collecting current electricity consumption and checking its own operating status), generating response data containing meter readings and device status codes (e.g., "00" for normal operation and "01" for fault). This data is then transmitted back to the control module via the meter reading and data collection circuit. The control module verifies the format of the response data, confirms its integrity, converts it from the Modbus protocol to the DL / T 645 protocol, and supplements metadata such as the terminal address and collection time to form a complete feedback data packet. Subsequently, the data packet is sent to the transmission modulation unit of the carrier communication module. This unit loads the data packet into a high-frequency carrier signal using FSK modulation and dynamically adjusts the transmission power based on the real-time load of the power line (determined by the current parameters synchronously fed back from the AC sampling module). Finally, after being amplified by a power amplifier, the data packet is transmitted back to the master station via the power line. After receiving the signal, the master station completes demodulation and verification. If the parsing is successful, it sends a "receive confirmation" to the control module. The control module stores the confirmation information and the terminal response data in the FLASH memory. If the master station reports parsing failure, the control module triggers retransmission, with a maximum of 3 retries to ensure the reliability of the returned data.

[0034] Furthermore, during the aforementioned bidirectional transmission process, the AC sampling module collects the voltage (0-380V), current (0-50A), and power parameters of the power line every 100ms. This data is converted into digital signals by a 16-bit ADC and transmitted to the control module. The control module uses these parameters to determine the power line channel quality (e.g., voltage fluctuations exceeding ±10% indicate channel instability) and automatically adjusts the operating frequency of the carrier communication module (e.g., switching from 200kHz to 300kHz to avoid interference). If on-site maintenance personnel need to temporarily query data, they can input a query command (e.g., "Query electricity consumption for the past 3 days") via the key-driven circuit (4×4 matrix keypad). After receiving the command, the control module retrieves the corresponding data from the FLASH memory and displays it intuitively on the display unit (e.g., "Electricity consumption on July 15, 2025: 12.5kWh"). When a sudden strong interference occurs on the power line (such as a lightning strike causing a carrier signal interruption), the control module detects three consecutive communication failures and automatically switches to the GPRS module to send the terminal response data or alarm information (such as "terminal failure") to the main station via the wireless cellular network, ensuring that critical data is not lost.

[0035] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A bidirectional carrier communication module, connected between a master station and a terminal via a power line, characterized in that, It includes a control module, a carrier communication module, and an interface module; wherein the carrier communication module and the interface module are respectively connected to the control module; The carrier communication module includes a receiving demodulation unit and a transmitting modulation unit. The high-frequency carrier signal from the master station is received by the receiving demodulation unit, demodulated into a digital signal, and then transmitted to the control module. The control module and the interface module then transmit the signal to the terminal. The response data from the terminal is transmitted to the transmitting modulation unit through the interface module and the control module. The transmitting modulation unit modulates the response data into a high-frequency carrier signal and transmits it back to the master station via the power line.

2. The bidirectional carrier communication module according to claim 1, characterized in that, It also includes a storage module and a power module; the storage module is used to store interactive data and operating parameters, and the power module supplies power to the control module, carrier communication module, interface module and storage module.

3. The bidirectional carrier communication module according to claim 1, characterized in that, The interface module includes an uplink channel interface circuit and a meter reading and data collection circuit; the uplink channel interface circuit is used to realize signal transmission between the control module and the master station; the meter reading and data collection circuit is used to connect the terminal and transmit data including collected data and status information.

4. The bidirectional carrier communication module according to claim 2, characterized in that, The storage module is a FLASH memory circuit, used to store various types of data, operating parameters, and communication protocol information processed by the control module.

5. The bidirectional carrier communication module according to claim 1, characterized in that, It also includes an AC sampling module connected to the control module, which is used to collect AC parameters of the power line and transmit them to the control module.

6. The bidirectional carrier communication module according to claim 1, characterized in that, It also includes a button driving circuit and a display unit, which are respectively connected to the control module; the button driving circuit is used to receive external input commands and transmit them to the control module, and the display unit is used to display data information.

7. The bidirectional carrier communication module according to claim 1, characterized in that, It also includes a GPRS module connected to the control module, which is used to enable wireless data interaction with external devices.

8. The bidirectional carrier communication module according to claim 1, characterized in that, The protocol conversion function of the control module includes converting the communication protocol of the master station into a protocol adapted to the terminal, or converting the communication protocol of the terminal into a protocol adapted to the master station.

9. The bidirectional carrier communication module according to claim 1, characterized in that, The control module integrates an anti-interference mechanism, including data error correction and retransmission functions, to ensure data integrity when power line noise causes signal distortion.

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