77results about "Unbalanced current interference reduction" patented technology

The invention relates to the technical field of power line communication, in particular to a signal noise reduction method and system for improving power line communication quality, and the method comprises the steps: carrying out the filtering of a power line communication signal at different synchronization lengths; analyzing the volatility of the local range of each power line communication signal value; comparing the distances between the original extreme value signal sequences before and after filtering to obtain a filtering effect of each power line communication signal value based on different synchronization lengths; obtaining a denoising selection weight of each power line communication signal value; based on the prediction result of the filtering weight of a preset number of signal values before each power line communication signal value, combining the signal distribution similarity in the window corresponding to the power line communication signal values and the denoising selection weight to obtain the filtering weight of each power line communication signal value, and weighting the filtered signals to obtain the power line communication signal value. And obtaining a final filtering value of each power line communication signal value. The invention aims to improve the de-noising quality of the power line communication signal.

The invention relates to the technical field of communication transmission, in particular to a power line carrier signal transmission method and device applied to a direct current lighting system, and the method comprises the steps: obtaining the current of each street lamp controlled by each concentrator in the direct current lighting system, constructing a current difference index and a noise interference index between any two adjacent street lamps, the voltage drop difference and the distance difference of any two adjacent street lamps are analyzed, and the signal influence index of a power line between any two adjacent street lamps is calculated by combining the control signal amplitude difference; according to the time domain difference and the frequency domain difference between a control signal issued by a concentrator and a control signal received by a terminal street lamp, an overall damage index is constructed by combining the control signal issued by the concentrator and the change of the timestamp of the control signal received by each street lamp, and the overall damage index is calculated based on a noise interference index, a signal influence index and the overall damage index. And obtaining the optimal routing forwarding path of each concentrator by using an optimization algorithm. The transmission effect of the carrier signal can be improved.

The invention relates to the technical field of power signals, in particular to a power line broadband carrier signal adaptive enhancement and noise reduction method and system. According to the method, the multi-dimensional interference characteristics of the power line transmission environment are acquired and the initial modulation parameters are pre-adjusted, so that the influence of environmental interference can be reduced at the initial stage of signal transmission, the signal transmission quality is improved, and the multi-path delay inequality of the aggregated signal and the channel attenuation coefficient are acquired in real time and are combined with dynamic channel adjustment, so that the signal transmission efficiency is improved. Signal components can be dynamically adjusted and optimized according to real-time changes of a power line channel, the adaptive capacity of a system is improved, signals can be optimized in real time by means of real-time transmission quality monitoring and optimization of enhanced carrier signals, the lagging influence of signal quality is avoided, and the system performance is improved. The method ensures that the power line communication system has good adaptive enhancement and noise reduction capabilities, improves the overall performance of the communication system, and can effectively overcome the influence of multipath effect, electromagnetic interference, attenuation and other factors on channel estimation in the prior art.

The utility model provides a signal processing circuit, electronic equipment and a communication system, and relates to the technical field of communication. The signal processing circuit comprises a differential conversion module, a synthesis module and a decoding module, the differential conversion module is connected with the synthesis module, and the synthesis module is further connected with the decoding module through a pair of differential signal lines. The differential conversion module is used for respectively converting the plurality of original signals into a plurality of original differential signal pairs and sending the original differential signal pairs to the synthesis module; wherein the amplitudes of the original differential signal pairs are the same. The synthesis module is used for converting the plurality of original differential signal pairs into a plurality of differential signal pairs with different amplitudes, and synthesizing the plurality of differential signal pairs into a composite differential signal pair. And the decoding module is used for decoding one composite differential signal pair into a plurality of original signals and sending the original signals to a signal receiving end. According to the signal processing circuit, the electronic equipment and the communication system, the number of signal lines can be reduced, and the cost is reduced.

The invention relates to a power line carrier signal modulation method based on channel measurement. In the method, a source node sends a full-band signal first signal covering a target spectral range, then receives signal-to-noise ratio data of each resource group sent by a destination node, and finally configures a modulation mode according to the signal-to-noise ratio of each resource group, thereby realizing dynamic configuration of the modulation mode of the resource group. And the method can adapt to a complex and changeable power line channel environment. According to the dynamic configuration modulation mode based on the signal-to-noise ratio, on one hand, actual channel quality measurement information can be fully utilized to realize maximum-rate transmission, and on the other hand, the modulation mode is matched with the channel quality, so that the anti-noise capability is high, and the reliability and accuracy of signal transmission are improved.

The invention discloses a communication method and system for on-line monitoring data of a power transmission line. Relates to a signal processing method and device. In order to overcome the problem of data loss or transmission errors caused by the fact that existing power transmission line data are transmitted through a power line, the method comprises the following steps: collecting power transmission line state data, modulating the power transmission line state data to a power transmission line state carrier signal, and transmitting the power transmission line state carrier signal through the power line; detecting the real-time state of the power line at the moment t; taking the real-time state of the power line at the t moment as input, and predicting an estimated state of the power line at the t + 1 moment through a power line state prediction model; and according to the estimated state of the power line at the t + 1 moment, selecting a corresponding signal processing strategy at the t + 1 moment to process the state carrier signal of the power transmission line.

The invention relates to the field of communication network fault prediction, in particular to a wired communication network fault prediction system, which comprises a data acquisition module used for acquiring first electromagnetic interference influence information of each electromagnetic source; the data preprocessing module is used for preprocessing the first electromagnetic interference influence information to generate second electromagnetic interference influence information; the data correction module is used for calculating the induced electromotive force of each position of the target section according to the mutual influence between the electromagnetic sources at different positions; according to the method, when whether the cable of the wired communication network breaks down is calculated, the possibility that due to the fact that the distances between different test sections and electromagnetic sources are different, the values of induced currents generated by the different test sections are different, and the possibility that the cable of the wired communication network breaks down is influenced is considered; compared with other wired communication network fault prediction methods, the method is higher in prediction precision, and is convenient for workers to carry out maintenance and other operations according to the method.

The invention relates to a backflow cable anti-theft method and system based on power line carrier noise suppression, and belongs to the technical field of power system security, and various noise components in a signal are effectively separated by performing sliding window preprocessing and empirical mode decomposition on the carrier communication signal collected by multiple monitoring nodes; then, intelligent suppression and future trend prediction of noise are realized by adopting a mode of combining classification weighting and LSTM network prediction; through the synergistic effect of a dynamic threshold mechanism and an unscented Kalman filtering algorithm, the system can adaptively adjust the noise suppression intensity, and interference components are eliminated to the maximum extent while the signal integrity is ensured; and finally, based on double criteria of short-time energy and zero-crossing rate characteristics and in combination with a multi-node delay inequality positioning algorithm, accurate identification and accurate positioning of theft events are realized.

The application relates to a backflow cable anti-theft method and system based on power carrier noise suppression, and belongs to the technical field of power system security and protection. Through sliding window preprocessing and empirical mode decomposition of carrier communication signals collected by multiple monitoring nodes, various noise components in the signals are effectively separated. Then, a combination of classification weighting and LSTM network prediction is adopted to realize intelligent noise suppression and future trend prediction. Through the synergistic effect of a dynamic threshold mechanism and an unscented Kalman filtering algorithm, the system can adaptively adjust the noise suppression strength, maximize the elimination of interference components while ensuring signal integrity. Finally, based on the double criteria of short-time energy and zero-crossing rate characteristics, combined with a multi-node time delay difference positioning algorithm, accurate identification and precise positioning of the theft event are realized.

The invention relates to a ground wire control method, device and system, a storage medium and a program product. The ground wire control method comprises the steps that ground wire impedance of equipment is obtained, the equipment is connected with a ground wire network of the equipment, and the ground wire network of the equipment is connected with a ground network of the equipment; acquiring a common-mode current on a power line of a ground wire network of the equipment; determining compensation current of the equipment according to the common-mode current and the ground wire impedance; and controlling the compensation current to be injected into a ground wire network of the equipment. The compensation current of the equipment can be determined according to the common-mode current and the ground wire impedance, so that ground loop coupling is effectively eliminated, noise interference in system operation is remarkably reduced, the problem of system instability caused by ground potential difference and common-mode coupling is reduced, and the reliability of the system is improved. And long-term stable operation of equipment in a complex and changeable electromagnetic environment is ensured.

An electronic control device includes: a circuit board configured to be provided in a frame and to have a communication circuit capable of receiving or transmitting differential signals via a pair of signal pins; a connector configured to be electrically connected to the circuit board and to input signals transmitted from an electronic device outside the frame by single-end transmission to the communication circuit; and a noise cancellation signal output circuit configured to output noise cancellation signals corresponding to noise superimposed on the signals in the connector, wherein one signal pin of the pair of signal pins of the communication circuit is connected to the connector, and the other signal pin is connected to the noise cancellation signal output circuit.

The application relates to a power line carrier target data modulation method and device, a storage medium and a chip. The method corrects the signal-to-noise ratio of each resource group based on a preset diversity number, then determines the bit number of each to-be-transmitted symbol sent based on the corrected signal-to-noise ratio, then calculates the to-be-transmitted symbol number according to the bit number of target data and the preset diversity number, and finally modulates the target data based on the modulation mode corresponding to the minimum to-be-transmitted symbol number and the preset diversity number by comparing the to-be-transmitted symbol numbers under different preset diversity numbers. The application dynamically adjusts the resource group configuration parameters according to the signal-to-noise ratio of each resource group, thereby adapting to the change of a channel condition, improving a communication rate and a communication success rate.

The invention relates to a power line carrier target data modulation method and device, a storage medium and a chip. According to the method, the signal-to-noise ratio of each resource group is corrected based on preset diversity times, then the bit number sent by each to-be-transmitted symbol is determined through the corrected signal-to-noise ratio, then the number of the to-be-transmitted symbols is calculated according to the bit number of target data and the preset diversity times, and finally the number of the to-be-transmitted symbols under different preset diversity times is compared. And modulating the target data based on the modulation mode corresponding to the minimum number of symbols to be transmitted and the preset diversity times. The resource group configuration parameters are dynamically adjusted according to the signal-to-noise ratio of each resource group, so that the method can adapt to the change of channel conditions, and the communication rate and the communication success rate are improved.

The present invention provides an active inductive impedance enhancement circuit applied to a power line path. It utilizes a closed-loop control technique to detect residual high-frequency signals on the power line and generates a compensation current injected into the secondary side of the main inductor accordingly. The invention actively suppresses high-frequency current flowing through the main inductor, thereby significantly enhancing its impedance against high-frequency noise.

To suppress increase of mode conversion loss due to variability in electric characteristics of electronic components mounted on a P side and an N side when different bias voltages are applied.SOLUTION: A signal transmission device that performs differential transmission comprises: an information processing circuit 9 that performs processing of various kinds of information related to differential transmission; and a power supply circuit 30 including a voltage output circuit that outputs a first application voltage to a first signal wire and outputs a second application voltage to a second signal wire. The information processing circuit 9 includes an output voltage determination unit 41 that determines an instruction value for at least one of the first application voltage and the second application voltage applied by the power supply circuit 30, and delivers the determined instruction value to the power supply circuit 30. The power supply circuit 30 has an output voltage adjustment function 42 for adjusting a parameter of the voltage output circuit so that the first application voltage and the second application voltage reflecting the received instruction value are output to the first signal wire and the second signal wire.SELECTED DRAWING: Figure 1

To more effectively reduces noise generated in a transmission path.SOLUTION: A transmission line structure includes a first transmission line and a second transmission line electrically connecting two devices, a first shield covering at least a portion of the first transmission line in the direction of a current flowing through the first transmission line, a second shield covering at least a portion of the second transmission line in the direction of a current flowing through the second transmission line, and a first conductor and a second conductor electrically connecting between the first shield and the second shield.SELECTED DRAWING: Figure 1

The invention relates to a ground wire control method, device and system, a storage medium and a program product. The ground wire control method comprises the following steps: for each device in a plurality of devices, controlling each device to be connected with a ground wire network of the device, and controlling the ground wire network of each device to be connected with a ground network of the device; acquiring the ground wire impedance of each device; taking the earth network with the minimum earth wire impedance as a target earth network; and controlling the ground wire network of each device to be connected to the target ground network. By measuring the ground wire impedance, the ground wire network with the minimum interference can be accurately identified, and the dynamic switching of the ground wire network can be completed, so that the optimal connection of the ground wire network is realized, and the reliability of system communication is improved.

The application discloses a method and system for improving the anti-interference of dual-mode communication, which comprises the following steps: when a source communication device sends service data to a target communication device, the source communication device respectively embeds a first wireless radio frequency probe sequence in power line carrier service data and a first power line carrier probe sequence in wireless radio frequency service data, and sends the data through corresponding channels; after the target communication device receives a mixed signal, the target communication device extracts an interference component corresponding to the probe sequence of the opposite end from the mixed signal; based on the interference component, the target communication device respectively estimates the self-interference channel coefficients of wireless radio frequency to power line carrier and power line carrier to wireless radio frequency; finally, the target communication device uses the estimated channel coefficients to perform digital domain interference cancellation on the mixed signal, thereby recovering the original power line carrier and wireless radio frequency service data. The application can actively and in real time cancel the inherent interference of dual-mode devices, thereby significantly improving the communication reliability and dual-mode cooperation efficiency.

In the case of the method and the subscribers and the communication bus system for transmitting data, in addition to the possibility from the bus master to the subscribers using differential electrical signals, a binary data transmission from the subscribers to the bus master is implemented by analysing the effect of changes to the common-mode level. For this purpose, a data transmission current is fed in or drawn at the input (12) of a subscriber (10), this being identified at the output (16) of a neighbouring subscriber (10), specifically based on the draw or the infeed of a compensation current in order to keep the common-mode level at the target value. A data transmission from the bus master (28) to the subscribers (10) using non-differential signals may take place in addition to the data transmission using differential electrical signals through a deliberate change in the common-mode level made by the bus master (28), this being identified at the input (12) of the first subscriber (10). This change in the common-mode level at the input (12) of a subscriber (10) is conveyed to a reference voltage source (42) at the output (16) of the subscriber (10), such that the same common-mode level shift as was sensed at the input (12) of the subscriber (10) is then generated at the output (16) of the subscriber (10).

To suppress the effect of common-mode noise signals superimposed on differential communication signals on communication.SOLUTION: A transmitting / receiving circuit 11 includes an attenuator 26 that attenuates a differential communication signal input via an insulation circuit 8 and supplies the attenuated signal to a receiving circuit 25, and a common mode signal suppression circuit 28 that suppresses a common mode noise signal superimposed on the differential communication signal based on an output signal of the attenuator 26. The common mode signal suppression circuit 28 includes a common mode signal detection circuit that detects a common mode voltage in the output signal of the attenuator 26, a first current generation circuit that generates a first correction current proportional to a first different voltage when the first different voltage obtained by subtracting a first reference voltage from the detected common mode voltage is a negative voltage, and supplies the first correction current to an input / output terminal of the transmitting / receiving circuit 11, and a second current generation circuit that generates a second correction current proportional to a second different voltage when the second different voltage obtained by subtracting the detected common mode voltage from a second reference voltage is a positive voltage, and supplies the second correction current to the input / output terminal of the transmitting / receiving circuit 11.SELECTED DRAWING: Figure 3

The invention provides an inverter communication data acquisition anti-interference method and system, and belongs to the technical field of power electronic communication. The method comprises the following steps: acquiring an original communication frame sequence in a communication bus in the operation process of the inverter, and synchronously acquiring interference sensing data representing the electromagnetic environment state of the inverter; constructing a communication-interference coupling feature set, and performing joint mapping to generate a multi-dimensional interference feature tensor; performing structural analysis on the multi-dimensional interference feature tensor to generate interference feature description parameters; constructing a communication frame disturbance prediction model, and calculating the frame structure offset and the data field disturbance quantity of each communication frame in the current interference environment; and when the communication frames meet the gate control detection abnormity, executing reverse compensation reconstruction of the corresponding communication frames, and outputting an anti-interference data set. According to the invention, the interference characteristics are accurately represented, reverse compensation reconstruction is carried out on the interfered communication frame, and the communication data acquisition reliability and the anti-interference capability are improved.

The invention discloses a method and system for improving dual-mode communication immunity, and the method comprises the steps: enabling a source communication device to respectively embed a first wireless radio frequency probe sequence in power line carrier service data, embed a first power line carrier probe sequence in wireless radio frequency service data, and embed a second wireless radio frequency probe sequence in wireless radio frequency service data when the source communication device transmits service data to a target communication device; and sending through a corresponding channel. After the target communication equipment receives the mixed signal, an interference component corresponding to the opposite-end probe sequence is extracted from the mixed signal; respectively estimating self-interference channel coefficients of the wireless radio frequency to the power line carrier and the power line carrier to the wireless radio frequency based on the interference component; and finally, performing digital domain interference cancellation on the mixed signal by using the estimated channel coefficient, thereby recovering the original power line carrier and wireless radio frequency service data. According to the invention, the inherent interference in the dual-mode equipment can be actively offset in real time, so that the communication reliability and the dual-mode cooperation efficiency are remarkably improved.

This application provides a power line communication system, a power electronic apparatus, and an interference suppression method. The power line communication PLC system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. According to embodiments of this application, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.

The invention provides a large-current HPLC (High Performance Liquid Chromatography) signal isolation device applied to an intelligent fusion terminal power distribution area network. The large-current HPLC signal isolation device comprises an input filtering module and a signal isolation attenuation module which are connected in sequence. The input filtering module is used for filtering common-mode and differential-mode interference of a power supply; the signal isolation attenuation module is used for electrically isolating and attenuating HPLC communication frequency band components while bearing heavy load current by utilizing an iron-silicon-aluminum magnetic core isolation inductor group connected in series on a transmission path to be matched with a filter capacitor group; impedance matching optimization is carried out on an LC network formed by a final-stage inductor and a capacitor of the signal isolation attenuation module. The technical problems that an existing HPLC signal isolation device cannot bear the working current of high-power equipment, so that magnetic saturation failure is caused, signal crosstalk is caused between adjacent local area networks in a power distribution area, and communication signals are submerged by broadband noise can be solved.

This application relates to signal correction for serial interfaces. A signal correction circuitry is described that improves the integrity of data transmitted over a serial data interface without interrupting communication between connected devices. The signal correction circuitry includes edge correction circuitry that accelerates rising and falling edges of a data signal. The signal correction circuitry also includes DC compensation circuitry that boosts the level of the data signal.

The invention discloses a low-voltage direct current power line communication system, comprising a pair of low-voltage direct current power lines V+ and V‑, wherein the power lines V+ and V‑ are connected with a core control unit / functional unit; the core control unit / functional unit comprises a power supply unit B01, wherein the power supply unit B01 is connected with a filter inductor L01 and a filter capacitor C01, and is respectively connected with the power lines V+ and V‑; the power supply unit B01 is also connected with a processing unit B02 for processing communication data and executing the main functions of the machine, wherein the processing unit B02 is connected with an amplitude modulation unit B03, and adopts amplitude modulation to meet the communication reliability requirements of the control system in a large noise environment; the circuit is simple, and the components are all conventional components that are easy to obtain, easy to mass produce, and low in cost; when the communication logic is at a high level, the output unit is in a high impedance state, and the high level corresponds to an idle state of the communication, so in the idle state, the communication circuit has no interference with the control system.

The present application relates to the technical field of mobile communications, and provides an MIMO communication system based on a cross-polarized leaky coaxial cable, applicable to coverage of 2G / 3G / 4G / 5G / 6G signals. By receiving signals of different standards from different operators, it is determined whether adjacent channel interference and intermodulation interference occur in the combination of the signals. The signals of different standards in the combination of the signals of different standards which produce interferences are respectively fed into different leaky coaxial cables, so that on one hand, adjacent channel interference between adjacent channel signals in a same leaky coaxial cable can be avoided, or intermodulation interference among different signals can be avoided, and the interferences between the signals are reduced, thereby improving the communication quality; and on the other hand, the radiation polarization directions of every two adjacent leaky coaxial cables are different, so that the coherence of leaky coaxial cable signals is reduced, thereby improving the communication quality.

The invention relates to the technical field of electric power operation and maintenance, in particular to an acquisition beacon monitoring device based on the Internet of Things. The acquisition beacon monitoring device comprises a shell, a power supply system, a power line coupling and protection module, a carrier transceiving module, a core processing module, a frequency band analysis module, an intelligent analysis module, an Internet of Things access module and a man-machine interaction unit. The power line coupling and protection module is connected with a low-voltage transformer area power line, the carrier wave receiving and transmitting module modulates and demodulates signals and outputs and collects beacon messages, and the core processing module analyzes the messages, calls the intelligent analysis module to carry out abnormity diagnosis and can trigger the frequency band analysis module to carry out noise detection and interference identification at the same time; the processed result is visually presented through a liquid crystal display screen and voice prompt, and can be uploaded to a remote platform through an Internet of Things module, thereby realizing centralized analysis and management. The device is portable in structure, has the visual, intelligent and remote characteristics, and can effectively improve the collection success rate and the field operation and maintenance efficiency of the electric energy meter.

The application relates to the technical field of power line carrier communication, and discloses a power line carrier signal pulse noise processing method and device and communication equipment, the method comprising the following steps: slidingly buffering a time domain signal collected at a current sampling point into a first buffer window; judging whether there are continuous target time domain signals of a first preset number on any side of a first target buffer position, the target time domain signal being a time domain signal with a signal intensity greater than or equal to a preset threshold; according to a first judgment result, determining whether to slide the time domain signal output by the first target buffer position into a second buffer window, the length of the second buffer window being smaller than the length of the second buffer window; judging whether there are continuous target time domain signals of a second preset number on any side of a second target buffer position, the second preset number being smaller than the first preset number; and according to a second judgment result, processing the time domain signal output by the second target buffer position. The application can reduce misjudgment and improve signal quality.

The invention provides an anti-attenuation and anti-interference circuit for long-distance transmission of voltage signals. The anti-attenuation and anti-interference circuit comprises a first measuring range adjusting circuit, a zero setting circuit, an isolation amplifying circuit, a U / I conversion circuit, a dynamic feedback compensating circuit, an I / U conversion circuit, a differential sampling circuit, a zero taking circuit and a second measuring range adjusting circuit. According to the invention, attenuation and interference can be effectively resisted in the long-distance transmission process of voltage signals, the accuracy and stability of signal transmission are ensured, meanwhile, a broken line detection function is provided, the fault of a signal transmission line can be found in time, and the strict requirements on high-reliability and low-bit error rate signal transmission in the manufacturing of communication system equipment are met.