30results about "Unbalanced current interference reduction" patented technology

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 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 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.

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).

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.

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 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.

The invention belongs to the technical field of carrier communication, and discloses an HPLC (High Performance Liquid Chromatography) anti-interference and dual-mode switching method and system based on channel state prediction, and the method comprises the steps: firstly, based on HPLC frame-level communication data, calculating frame-level statistical characteristics such as a frame bit error rate and average retransmission times, and constructing a time sequence; predicting the deterioration probability of a carrier channel based on the time sequence, and synchronously evaluating the prediction credibility; and finally, according to the deterioration probability and the prediction credibility, controlling the communication system to migrate among three communication states of carrier enhancement, double-link parallel and wireless primary use. The method can identify the channel degradation trend in advance, reduces frequent switching, improves the stability and reliability of a communication system, adapts to the existing dual-mode communication equipment, and has a remarkable practical value.

In the described examples, a device contains a bias circuit, an output circuit, and several current source circuits. A first plurality of current source circuits is coupled between a first output of the bias circuit and a first input of the output circuit. A second plurality of current source circuits is coupled between a second output of the bias circuit and a second input of the output circuit. Each of the current source circuits has a first and second resistor, a first and second switch, and a transistor. The first switch is coupled between a gate of the transistor and the bias circuit. The second switch is coupled between the gate of the transistor and a first terminal of the transistor. The second terminal of the transistor is coupled to the output circuit.

The present application relates to the field of data processing, more particularly, the present application relates to a smart meter signal enhancement method and system based on reinforcement learning, the method comprising: collecting the history and current noisy carrier signal of the meter and the history noise-free reference signal; based on the adaptive division of the frequency band of the signal spectrum difference; for each frequency band, calculate the reward participation; the candidate filter action is applied to the current signal, and the time domain and frequency domain enhancement effect value of each frequency band is calculated; based on the reward participation, the two-dimensional effect value is weighted and summed and the action complexity penalty is deducted to obtain the adaptive reward function value; combined with the discounted reward obtained by the future state prediction model, the comprehensive return value is calculated to determine the optimal filter action vector, and finally the signal enhancement is realized. The present application effectively avoids the signal distortion problem caused by the traditional overall signal-to-noise ratio evaluation, and significantly improves the reliability and signal fidelity of the power line carrier communication.

The utility model discloses a current loop transmission circuit, which comprises a transmitting circuit, the transmitting circuit comprises a first optocoupler module, a first switch driving module, a selection protection module and a current limiting module, the input end of the first optocoupler module is used for receiving signals, and the output end of the first optocoupler module is connected with the input end of the first switch driving module; the output end of the first switch driving module is connected with the input end of the selection protection module, the protection output end of the selection protection module is connected with a first ground end, the signal output end of the selection protection module is connected with the input end of the current limiting module, and the output end of the current limiting module is used for outputting signals. The selection protection module is arranged in the circuit, when pulse voltage or high voltage signals appear in the circuit, the pulse voltage or high voltage signals are connected to the ground end through the selection protection module, elements in the circuit are protected, the accuracy and stability of signal transmission of the circuit are guaranteed, the service life is prolonged, and the cost is reduced.

The invention relates to the field of data processing, in particular to an intelligent electric meter signal enhancement method and system based on reinforcement learning, and the method comprises the steps: collecting historical and current noisy carrier signals and historical noise-free reference signals of an electric meter; frequency bands are adaptively divided based on historical signal spectrum differences; for each frequency band, calculating a reward participation degree; acting the candidate filtering action on the current signal, and calculating enhancement effect values of the time domain and the frequency domain of each frequency band; performing weighted summation on the two-dimensional effect value based on the reward participation degree, and deducting action complexity penalty to obtain a self-adaptive reward function value; and in combination with a discount reward obtained by a future state prediction model, a comprehensive return value is calculated to determine an optimal filtering action vector, and finally signal enhancement is realized. According to the method, the problem of signal distortion caused by traditional overall signal-to-noise ratio evaluation is effectively avoided, and the reliability and signal fidelity of power line carrier communication are remarkably improved.

The invention relates to an electric power communication prevention system based on Beidou and optical fiber sensing, belongs to the technical field of electric power communication, and is used for solving the problem that positioning points of communication interruption, delay or misinformation in a high-attention area are easily ignored. The method comprises the following steps: acquiring a regional concern point number difference value, a regional concern level change value, a regional highest temperature and lowest temperature difference change value, a regional concern point strain value average difference and a vibration risk coefficient to obtain a regional current monitoring coefficient and a regional actual risk coefficient, and formulating a group of fuzzy rules according to the regional current monitoring coefficient and the regional actual risk coefficient to perform fuzzy reasoning. The method comprises the following steps: determining a focus point adjustment ratio result of a prevention area, establishing a time sequence model for prediction, determining a prevention area range distribution scheme according to a prediction result, reducing monitoring interference in the area, and timely discovering a positioning point with communication interruption, delay or misinformation in the prevention area.

A signal transmission device according to one aspect of the present invention is a signal transmission device that performs differential transmission, and includes an information processing circuit that performs processing of various types of information, and a power supply circuit that includes a voltage output circuit outputting a first applied voltage to a first signal wiring and outputting a second applied voltage to a second signal wiring. The information processing circuit includes an output voltage determination unit that determines an instruction value of at least one of the first applied voltage or the second applied voltage applied by the power supply circuit and that sends the determined instruction value to the power supply circuit. The power supply circuit has an output voltage adjustment function of adjusting a parameter of the voltage output circuit such that the first applied voltage or the second applied voltage reflecting the received instruction value are output to the first signal wiring and the second signal wiring.

This invention relates to a power line carrier signal modulation method based on channel measurements. In this method, the source node transmits a first signal covering the entire target spectrum, then receives the signal-to-noise ratio (SNR) data for each resource group transmitted by the destination node. Finally, the modulation mode is configured according to the SNR of each resource group, thereby achieving dynamic configuration of the resource group modulation mode. This allows for adaptation to complex and variable power line channel environments. The dynamic SNR-based modulation mode configuration, on the one hand, fully utilizes actual channel quality measurement information to achieve maximum transmission rate; on the other hand, the modulation mode matches the channel quality, resulting in strong noise immunity and improved signal transmission reliability and accuracy.

The application discloses a communication method, device and system based on PLC technology, relates to the technical field of communication, and can realize accurate and timely transmission of signals in a PLC scene and improve the success rate of signal transmission.In the scheme, the PLC host can negotiate with the master nodes of multiple PLC loops to make the multiple PLC loops work in different frequency bands (such as non-overlapping frequency bands), so as to prevent problems such as data packet errors and bit errors caused by mutual interference between the PLC loops, avoid the problem of incorrect loop entry of PLC sub-devices, and improve the reliability of communication of the PLC sub-devices in each PLC loop.In addition, since the working frequency bands of the multiple PLC loops are determined through negotiation, the scheme can support flexible allocation of the working frequency bands of the PLC loops, especially in the case that the number of PLC sub-devices is large and the network is complex, can maximally avoid the problem of spatial crosstalk, and guarantees the accuracy and timeliness of signal transmission.

The application relates to the technical field of power line carrier communication, and discloses a power line carrier communication device, a power line carrier communication method and a power line carrier communication system. The device comprises a power line carrier communication chip and a controller. The power line carrier communication chip comprises a sending module, a receiving module and a multiplexer. The controller is used for sending a first control signal to the multiplexer to configure the multiplexer into a first state in which a first input end and a first output end are in communication. The receiving module is used for receiving a first carrier signal from the sending module, processing the first carrier signal, and obtaining characteristic information of the first carrier signal. The controller is further used for determining the power spectral density of the first carrier signal according to the characteristic information, and adjusting the sending power of the sending module when the sending module sends a second carrier signal to a target communication device according to the power spectral density. The application can make the actually emitted signal always meet the requirements of the HPLC communication protocol under the condition that the actual power line load changes greatly.

The invention relates to the technical field of electric power communication, in particular to a long-term maintenance method for a dual-mode network of a low-voltage power line carrier communication system, which comprises the following steps of: calculating the proxy priority of a current routing period by using a formula by collecting parameters such as communication success rate and signal-to-noise ratio of neighbor nodes; recording a plurality of routing cycle historical parameters, calculating a statistical value after a sample reaches the standard, and estimating a future priority to perform long-term agent evaluation; in the network access stage, a beacon frame parameter is extracted to select a link, and an association request is sent to retry to access the network; in the agent change stage, parameters are stored, the current agent is compared after nodes are screened by using statistical values, and the agent is changed if conditions are met. The method solves the problem that long-term stability of a network is difficult to be guaranteed by a traditional scheme under complex interference, can remarkably enhance the anti-interference capability, and greatly improves the service stability.

An electronic control device includes: a circuit board disposed in a housing and having a communication circuit capable of receiving or transmitting a differential signal via a pair of signal pins; a connector electrically connected to the circuit board and inputting a signal transmitted by single-end transmission from an electronic device outside the housing to the communication circuit; and a noise cancellation signal output circuit outputting a noise cancellation signal corresponding to noise superimposed on the signal in the connector, one of the pair of signal pins of the communication circuit being connected to the connector and the other being connected to the noise cancellation signal output circuit.

The application provides a single firewire communication method based on current detection and thyristor modulation, comprising: calibrating zero-crossing timing reference and reference current; establishing mapping of data symbols and thyristor conduction angle and dynamically adjusting according to loop current size, encoding to-be-transmitted data to generate encoding sequence; converting the encoding sequence into a thyristor trigger signal to drive the conduction angle to conduct at the corresponding moment, generating stable current fluctuation through conduction angle modulation and transmitting to the receiving end; the receiving end collects loop current fluctuation signals in real time and processes them through multi-stage filtering to obtain effective current signals, initializes decoding threshold according to the reference current, identifies the conduction angle change corresponding to the effective current signals to restore the symbols, and outputs after checking the symbols. The thyristor specific conduction angle is used for data encoding, the small change of the detected loop current is used for data decoding, and the problems of unstable communication and high decoding error rate in the single firewire small current scene are solved.

To provide systems and methods for signal boosting in serial interfaces.SOLUTION: A system for boosting signals comprises boosting circuitry. The boosting circuitry is operatively coupled to a voltage supply 304 during a charging phase and is operatively coupled to the at least one data line 306 of signal transmission lines DP, DM during a discharging phase 308. During the discharging phase 310, at least one boosting capacitor 302 boosts voltage of one or more signals transmitted on the at least one line. The boosting circuitry also comprises switching circuitry that switches a state of the at least one boosting capacitor 302 from a state of being operatively coupled to the voltage supply 304 to a state of being operatively coupled to the at least one line of the signal transmission lines.SELECTED DRAWING: Figure 3

The invention provides an impulse noise suppression method and system based on power line carrier communication and a terminal, and relates to the technical field of impulse noise suppression. Controlling a preset power communication system to receive and transmit preset power line carrier data according to the subcarrier signal-to-noise ratio so as to determine actual received data; performing filtering processing on the actually received data to determine filtering processing data; analyzing the actually received data and the filtered data to determine a data processing interval; and performing data normalization processing on the filtering processing data according to the data processing interval to generate noise suppression data. The method and the device have the effect of improving the suppression effect of the pulse noise.

This invention discloses an anti-interference communication device and method. A constant current circuit is set between the master and slave devices. This circuit converts voltage or digital signals into a constant current signal, which is transmitted between the master and slave devices via a communication line. Utilizing constant current for transmission between the master and slave devices overcomes the problems of poor anti-interference capability, impedance mismatch, and signal instability in existing data transmission methods, thus reducing interference in the communication circuit. The current control scheme proposed in this invention uses inexpensive components, and the effective stabilization of the current in the communication circuit through circuit structure construction achieves stable signal transmission between the master and slave devices.

The present application relates to the technical field of power signal, in particular to a kind of power line broadband carrier signal adaptive enhancement and noise reduction method and system.The present application can reduce the influence of environmental interference in the initial stage of signal transmission by obtaining the multi-dimensional interference characteristics of power line transmission environment and pre-adjusting initial modulation parameters, improve signal transmission quality, by real-time acquisition of the multiple path delay difference and channel attenuation coefficient of aggregated signal and combined with dynamic channel regulation, signal components can be dynamically adjusted and optimized according to the real-time changes of power line channel, improve the adaptability of the system, by using real-time transmission quality monitoring and optimization means of enhanced carrier signal, signal can be optimized in real time, avoid the lag effect of signal quality, ensure that power line communication system has good adaptive enhancement and noise reduction ability, improve the overall performance of communication system, which can effectively overcome the influence of multipath effect, electromagnetic interference and attenuation and other factors on channel estimation in traditional technology.