70 results about "Conducted Interference" patented technology

The invention discloses an electromagnetic compatibility testing method and an electromagnetic compatibility testing system for an industrial control power supply, which are used for evaluating conducted interference, radiated interference and immunity performance. The system comprises a load module, a signal connection module, an electromagnetic interference measurement module, an immunity test module, a data processing module and a hardware acceleration module. The load module simulates the actual working state of the industrial control power supply through resistive, inductive, capacitive and dynamic loads; the signal connection module adopts high-frequency shielding and grounding optimization design, so that external interference is reduced; the electromagnetic interference measurement module is combined with the frequency domain analysis and time domain response module to capture interference signal characteristics and power supply dynamic output; the data processing module generates an electromagnetic compatibility report through a comprehensive evaluation algorithm; and the hardware acceleration module realizes real-time processing of high-frequency sampling data by utilizing the FPGA. The method is suitable for the electromagnetic compatibility test of the industrial control power supply in the fields of industrial automation, communication equipment and power electronics, and has wide engineering application value.

The invention discloses a simulation calculation method and terminal for conducted noise, and the method comprises the steps: building a power transmission schematic diagram of a power system of to-be-analyzed target equipment, and recognizing all interference sources and coupling paths in the schematic diagram; in a frequency range to be analyzed, a discretized interference source amplitude expression is defined for each interference source, and a transfer function of a coupling path between each interference source and each electromagnetic compatibility conducted interference detection point is established; constructing a conducted noise evaluation equivalent model expression, establishing a simulation model, and based on the constructed simulation model, performing simulation operation in combination with the actual parameters of the target equipment and the full-load and no-load conducted interference test spectrums when each interference source works independently; an evaluation result can be obtained according to the simulation operation result and a preset standard limit value; and more effective electromagnetic compatibility conducted interference evaluation can be realized.

The invention provides an electromagnetic compatibility performance diagnosis system and method, relates to the field of data analysis, and adopts a data processing technology based on natural language analysis. And analyzing the radiation emission experimental data, the conducted emission experimental data, the radiation immunity experimental data and the conducted interference experimental data of the target analysis equipment to obtain an electromagnetic compatibility diagnostic report of the target analysis equipment. Therefore, comprehensive and automatic data analysis can be realized, and the accuracy and efficiency of electromagnetic compatibility diagnosis can be improved.

The present invention discloses a method, device, equipment and storage medium for simulating the conducted interference of a converter, in the field of circuit simulation technology. The method comprises: obtaining a converter conducted interference simulation circuit; utilizing a switch control module to obtain and output corresponding control signals to each switch device on each bridge arm in a first converter module; utilizing a rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module, respectively, to obtain a voltage processing signal and a current processing signal; utilizing the voltage processing signal and the current processing signal as excitations for the voltage source and the current source on each bridge arm in a second converter module, utilizing a high-frequency circuit to obtain simulation results corresponding to a load control instruction; the present invention establishes an ideal circuit and a high-frequency circuit respectively in the same simulation circuit, thereby solving the problem of incompatibility between the high-frequency circuit and the low-frequency circuit, and realizing high-precision simulation of the conducted interference of the converter.

The application discloses a kind of digital control circuit board anti-interference filter design methods under group pulse action, realize the accurate modeling of EFT noise to digital control circuit conduction interference coupling, and based on conduction interference coupling circuit model and failure threshold, the quantitative design of anti-interference filter is carried out.Compared with traditional method, the application provides a kind of method for establishing chip black box impedance model based on online test and vector matching method, solves the impedance model modeling problem of chip under no internal structure data, and establishes the conduction interference coupling model of digital control circuit under EFT noise, provides model basis for quantitative design;From the angle of quantitative design, the anti-interference filter design method of the application effectively improves the anti-interference level of digital control circuit.

The present invention relates to the technical field of electrical fire monitoring. An embodiment of the present invention discloses a method, a system and a device for identifying a fault arc. The method for identifying a fault arc includes: obtaining the ADC raw data of an arc signal, where the ADC raw data includes current raw data; respectively processing the current raw data through FFT (Fast Fourier Transform) and extracting the second-order wavelet coefficients of the current to obtain a current comparison result; and judging whether a fault arc occurs according to the current comparison result. By using a multi-domain identification method based on FFT, the present invention extracts the characteristics of the distortion of the arc current from the perspective of a multi-dimensional domain, and infers whether a real fault arc is generated or it is due to the line conduction interference of a mixed load, thereby greatly improving the accuracy of arc detection.

The invention relates to the technical field of fire detection, and discloses a multi-sensor pyrolysis particle fire detection control system and device, and the system comprises a power supply and signal coupling module, a dielectrophoresis modulation detection cavity module, a multi-dimensional environment sensing module, a central processing unit and an execution module. The power supply and signal coupling module extracts a high-frequency conducted interference signal of a power supply circuit and generates a high-voltage driving signal and a reference signal respectively; the dielectrophoresis modulation detection cavity module is used for establishing a non-uniform electric field by utilizing a high-voltage driving signal and carrying out dielectrophoresis modulation on aerosol particles passing through a detection area; the central processing unit synchronously collects the photoelectric detection signal and the reference signal, and determines the fire state by calculating a cross correlation coefficient. The device integrates the modules in a shell. According to the invention, physical and signal correlation between power supply noise and particle concentration change is established, electrical fire pyrolysis particles and environmental dust are effectively distinguished, and high-sensitivity early detection of electrical fire is realized.

This invention discloses a near-field scanning detection method based on active learning to obtain conducted coupling paths. The method includes: constructing a near-field scanning detection platform; placing the circuit board under test (PCB) in a microwave anechoic chamber; and using the near-field scanning detection platform directly above the PCB to perform detection; obtaining the detection results using an active learning-based near-field scanning method; and obtaining a near-field current distribution map on the PCB at continuous time intervals based on the detection results, thereby realizing the detection of conducted coupling paths. This invention utilizes active machine learning methods to achieve more efficient near-field scanning detection, concentrating scanning points in areas with strong currents and accurately reconstructing the actual current changes of the PCB using the scan results of sparse points, greatly improving detection efficiency. By using near-field scanning detection to reconstruct the current changes on the circuit board, the coupling paths of conducted interference currents on the PCB can be quickly analyzed, meeting the requirements for detecting electromagnetic interference in systems in practical engineering.

The invention discloses a vehicle-mounted TBOX test method, and relates to the technical field of intelligent network connection automobile communication test, and the method comprises the following steps: S1, carrying out state extraction through employing multi-scene signal data; s2, performing integrity analysis by using a signal intensity sequence; s3, performing channel quality calculation by using the data recovery capability sequence; s4, performing interference analysis by using the stability measurement sequence; s5, performing anti-interference analysis by using disturbance characteristic distribution; and S6, performing stability evaluation by using an interference response structure. By setting the anti-interference capability model based on the channel disturbance intensity, the anti-interference capability of the TBOX can be accurately quantified in a dynamic wireless communication environment, and compared with an existing fixed signal-to-noise ratio evaluation method, the method introduces a signal interference characteristic matrix and combines the real-time matching relation between the signal intensity and interference factors, so that the anti-interference capability of the TBOX can be accurately quantified. And finer interference influence evaluation is provided, so that the TBOX can maintain high communication stability in a changeable environment.

A lightning protection device of a tethered balloon communication system, comprising: a lightning protection net, a shielding layer, a protection circuit; the lightning protection net wraps the tethered balloon; the shielding layer is installed outside the communication module and the communication line of the tethered balloon and is connected with the lightning protection net; the protection circuit is connected inside the communication module and is used for protecting common mode and differential mode interference caused by lightning; the lightning protection net arranged outside the tethered balloon, the shielding layer and the protection circuit arranged inside the communication module are designed according to the characteristics of the communication system in the tethered balloon, the communication module and the communication line are treated in all directions, the damage caused by lightning to the communication module of the tethered balloon and the radiation and conduction interference in the lightning process are effectively reduced, the normal work of the communication module in the lightning process is ensured, and the accuracy and reliability of data transmission are ensured.

The invention belongs to the technical field of charging piles, and particularly relates to a power-frequency small-current leakage protection low-frequency conducted interference resistance detection system and method. The system comprises a random phase-shift frequency-conversion oscillation module for converting low-frequency conducted interference of 10kHz-150kHz into an unstable equivalent low-frequency signal by introducing random delay to control the charging overturning time of a magnetic core; the dot frequency comb filtering module is used for filtering the current signals of a plurality of preset power frequency harmonic frequency points and outputting a maximum effective value; and the power frequency current judgment module is used for judging whether the effective value continuously exceeds a threshold value (such as 5mA) and reaches stable time (such as 50ms) so as to distinguish real electric leakage and interference. The method is realized based on the system. The core advantages of the invention lie in that misoperation caused by low-frequency conducted interference can be effectively avoided, the reliability of high-sensitivity (5mA) electric leakage protection in a complex electromagnetic environment (such as electric vehicle charging) is significantly improved, and the strict safety standard requirements such as UL2231 and the like are met.

The present application relates to the technical field of aircraft testing, and discloses a radiation and conduction overlapping frequency band HIRF comprehensive sensitivity test device and a test method, the device comprising a reverberation chamber and a test control system, a grounding panel and a support seat are arranged in the reverberation chamber, the support seat is arranged on the grounding panel, a device under test is placed on the upper surface of the support seat, a stirrer is arranged at a corner of the reverberation chamber, and the test control system is in bidirectional communication with a signal generation and processing system, an adaptive delay compensation system, a radiation test system, a conduction test system, an optoelectronic conversion system and a measurement receiver. The present application aligns the arrival time of a radiation field and conduction interference at the device under test through the adaptive delay compensation system, reproduces the electromagnetic energy synchronous coupling effect in the HIRF environment, combines field strength closed-loop control and conduction current monitoring feedback, synchronously applies a radiation field strength and wire bundle injection current that meet standard levels, and realizes verification of the coupling mechanism of radiation-conduction comprehensive sensitivity.

The application discloses an electromagnetic compatibility quantitative evaluation method based on a conduction emission model, which can realize electromagnetic interference simulation prediction on the power line conduction emission result measured by equipment, evaluate the conduction interference coupling response of electromagnetic emission of the equipment, and is suitable for guiding the equipment to perform electromagnetic compatibility examination and evaluation in engineering. The application takes the power line conduction emission spectrum test data of the equipment as the input of an evaluation model, then calculates the conduction coupling response value of the power line conduction emission of the equipment at the general electrical equipment end, and evaluates and analyzes the power line conduction emission result of the equipment according to the response value, so as to guide the equipment to perform electromagnetic compatibility examination and evaluation in engineering.

The invention discloses a rapid assessment method for radio frequency conducted interference of a power supply module. The method comprises the following steps: carrying out induction and classification on the power supply module from the aspects of function application and size, and then judging the weights of differential mode interference and common mode interference in radio frequency conducted interference of the power supply module through an analytic hierarchy process; influence factors influencing radio frequency conducted interference of the power module are concluded and classified by using an electromagnetic topological structure according to an analytic hierarchy process; carrying out weight analysis on the related influence factors according to an index weight ANP algorithm; performing prediction calculation on conducted interference under each influence factor through a rapid evaluation method; and calculating the radio frequency conducted interference of the power supply module under the condition of multiple influence factors by analyzing the distributed weight. Through the conducted interference under the multi-factor coupling characteristic of the power supply module, the rapid evaluation of the conducted interference of the power supply module is realized.

This application relates to a high-frequency carrier electromagnetic protection system, method, and electronic device for power energy storage. The system includes: a high-frequency carrier detection module for acquiring high-frequency carrier digital signals; an interference suppression control module that uses an interference signal identification algorithm to obtain the interference type and intensity level of the interference signal, and uses a filtering parameter optimization algorithm to obtain the optimal filtering parameters based on the interference type and intensity level, and obtains a shielding status monitoring command through a shielding status linkage algorithm; an adaptive filtering module that controls the on / off or combination of capacitor arrays and inductor arrays according to the optimal filtering parameters to filter out conducted interference signals; and a multi-layer shielding module that responds to the shielding status monitoring command to filter out radiated interference signals. This solves the problems of insufficient protection targeting, single protection level, and poor compatibility in electromagnetic protection technologies, achieving precise and efficient protection against high-frequency carrier electromagnetic interference, while ensuring the operating efficiency and stability of the power energy storage system.

The utility model discloses an electric heat tracing control device with a main / standby switching function, and solves the problems of switching disorder and switching failure caused by conduction interference and radiation interference on a permanent magnet by an electrical element in the device when the permanent magnet of the existing device adsorbs a movable seat to drive a conductive block to move. Comprising an equipment main body, a control circuit assembly and a switching driving mechanism, the control circuit assembly comprises an output terminal, a main controller, a standby controller and a main and standby switching part; according to the embodiment of the utility model, the switching driving mechanism and the main and standby switching part are arranged, and the switching driving mechanism and the main and standby switching part are cooperated to realize stable switching of the main control circuit or the standby control circuit of the electric heat tracing; and meanwhile, the switching driving mechanism and the main and standby switching part can realize the isolation power failure of the main control circuit or the standby control circuit when the main control circuit or the standby control circuit is switched, so that the accident of electric leakage during switching is avoided.

The invention discloses an anti-interference isolation circuit of an elevator interphone. An input terminal CN1; the normal phase end of the operational amplifier unit U22 is respectively connected with one end of the input terminal CN1 and an input voltage through a resistor R27 and a capacitor C26 in sequence, and the reverse phase end of the operational amplifier unit U22 is connected with the other end of the input terminal CN1 through a resistor R32 and a capacitor C28 in sequence; the positive phase end of the operational amplifier unit U18 is connected with the output end of the operational amplifier unit U22 through a resistor R28 and a capacitor C27 in sequence, the negative phase end of the operational amplifier unit U18 is connected with the output end, and the output end is further connected with the positive electrode of the light emitting end of the optocoupler U19; the negative electrode of the light-emitting end of the optocoupler U19 is grounded, the collector of the optocoupler U19 receives a voltage, the emitter of the optocoupler U19 is grounded through a resistor R103, the emitter of the optocoupler U19 is further connected with other peripherals, and electromagnetic interference and conducted interference generated in the elevator strong current environment are thoroughly blocked from two fundamental paths of power supply and signal transmission through the dual design of power isolation and signal isolation. And complete isolation of strong current and weak current is realized.

The present invention discloses a touch screen vulnerability analysis and protection method and system, which relates to the field of electronic terminal technology. It includes: preliminarily judging whether the touch screen has vulnerability and determining the vulnerable frequency point; obtaining the touch screen drive signal, and designing the interference signal based on the drive signal to realize the false point injection; collecting the abnormal sample data of the false touch point generated by the interference signal and the normal sample data generated by the normal touch; pre-processing the sample data; establishing and training the reporting point enhancement model based on machine learning, collecting the contact point related data of the device to be tested in real time, and the touch screen does not respond to the contact points identified as abnormal, so as to realize the vulnerability protection. The present invention analyzes the vulnerability of the capacitive touch screen from the two aspects of conducted interference and radiated interference, and realizes the vulnerability defense in the software by using the reporting point enhancement model, and realizes the vulnerability defense in the hardware by combining the filtering module, which can effectively improve the anti-interference ability of the touch screen and reduce the false alarm rate of the touch screen.

The application provides a common-mode interference modeling and analysis method for an SLLC resonant converter, and belongs to the technical field of power electronics and electromagnetic compatibility; by extracting key parasitic parameters of a circuit, combining a transmission line theory and an equivalent circuit modeling technology, constructing a high-precision common-mode interference propagation path model, and introducing complex high-frequency line parasitic parameters, the application describes the propagation characteristics of common-mode currents; aiming at the calculation complexity problem caused by high-dimension modeling, the application proposes a model simplification strategy, effectively reduces the calculation complexity while ensuring the analysis accuracy through equivalent transformation and frequency domain order reduction processing; the application has the advantages of high precision, high efficiency, strong universality and the like, and is suitable for common-mode interference modeling analysis and electromagnetic compatibility design of the SLLC resonant converter and other various high-frequency power electronic devices.

The invention discloses an active suppression method for conducted interference of a charging module cluster and a related device, which are used for enabling the charging module cluster to still effectively suppress conducted interference in a high-power parallel operation scene and maintaining the output stability and reliability of a system. The method comprises the following steps: acquiring operation parameters of a plurality of charging modules working in parallel; establishing a switching noise contribution model reflecting the influence degree of each charging module on cluster conducted interference based on the operation parameters; analyzing the switching transient states of the plurality of charging modules under the current working condition by using the switching noise contribution model, and calculating the spectrum superposition relationship of the plurality of charging modules under the current working condition; determining a target relative time sequence relation according to the spectrum superposition relation; and issuing a switch parameter adjustment instruction to the plurality of charging modules according to the target relative time sequence relationship, and performing synchronous calibration on the switch control time sequence in the plurality of charging modules, so that the plurality of charging modules execute switch actions according to the calibrated relative time sequence.

The invention discloses a variable-frequency oscillation anti-interference system and an interference signal acquisition method, and belongs to the technical field of charging piles. The system comprises a fluxgate current acquisition module, an edge jump catcher unit, an upward counter unit, a random number generator unit, a data comparator unit, a high-low level state latch unit, an arithmetic unit, a digital-to-analog conversion unit and a low-pass filter circuit. Time delay controlled by a random number is introduced in the switching process of forward and reverse charging of the magnetic core, so that the sampling phase of the system is randomized, and the fixed harmonic relation between the sampling frequency and an interference signal of a specific frequency band is broken, and therefore, low-frequency conducted interference of the frequency band of 15kHz-150kHz is effectively inhibited, and misoperation caused by the fact that the low-frequency conducted interference is misjudged as a direct-current leakage signal is avoided. According to the invention, the accuracy and reliability of residual current detection in high-interference environments such as automobile charging piles and photovoltaic power generation are obviously improved.

This invention provides a method, apparatus, receiver, medium, and system for conducting interference testing of inverters, relating to the field of equipment testing technology. The method includes: for any test condition among all test conditions, controlling a first LISN to perform phase adjustment, and performing conducted interference testing on the device under test based on the phase-adjusted first LISN; after all phase tests corresponding to the first LISN are completed and without power interruption, controlling a second LISN to perform phase adjustment, and performing conducted interference testing on the device under test based on the phase-adjusted second LISN; the first LISN may be an AC LISN or a DC LISN, and the second LISN may be an AC LISN or a DC LISN, wherein the first LISN and the second LISN are of different types. This invention can significantly reduce test time, thereby improving the overall test efficiency of conducted interference testing.

The invention belongs to the field of acoustics and vibration measurement, and provides a high-frequency piezoelectric array, an operation method thereof and a noise measurement system.The high-frequency piezoelectric array comprises a supporting pipe, a signal line is arranged in a cavity of the supporting pipe, part of the area of the signal line extends out of the cavity, and the signal line is used for transmitting different types of signals; the plurality of pre-amplifiers are arranged in the cavity of the supporting tube, and the plurality of pre-amplifiers are used for receiving the array element signals and amplifying the array element signals; the array element linings are distributed on the outer sides of the supporting pipes; each array element lining is made of an insulating material, and each array element lining has a damping function; the plurality of array elements are mounted on the plurality of array element linings and are not in contact with the outer side of the supporting tube; different array elements are electrically connected with different preamplifiers; the plurality of array elements are used for generating array element signals. According to the high-frequency piezoelectric array, vibration isolation and electrical isolation of the array elements and the supporting tubes are achieved, and electromagnetic radiation interference and vibration conduction interference of the array connecting ends are weakened.

The invention discloses a wireless communication anti-interference method, system and device and a storage medium, and relates to the technical field of wireless communication. The method comprises the steps that the wireless communication anti-interference method is applied to a wireless communication system, the wireless communication system comprises a hardware layer and a software layer, index data of the hardware layer are obtained, and interference information is obtained by conducting interference identification on the index data of the hardware layer through the software layer; and adjusting parameters of the hardware layer according to the interference information. The software layer performs interference identification based on the index data of the hardware layer, determines interference information, and then directly adjusts parameters of the hardware layer according to the interference information; through cooperative work of the hardware layer and the software layer and direct adjustment of parameters of the hardware layer, the anti-interference capability and the transmission rate of the wireless communication system are improved, so that the wireless communication system can correctly receive and transmit data.

The invention discloses a filter circuit and a filter. The filter circuit comprises a first filter module, a common mode inductor and a second filter module; the first filtering module, the common mode inductor and the second filtering module are connected in sequence and are connected between the input and the output of the filtering circuit; at least one of the first filtering module and the second filtering module includes an attenuation element and a capacitor connected in series. According to the technical scheme provided by the embodiment of the invention, the resistor and the inductor in the equivalent circuit structure of the attenuation element can form a new LC filtering structure and a new RC filtering structure with the capacitor in the first filtering module or the capacitor in the second filtering module respectively; and a plurality of different cut-off frequencies are additionally generated at different frequency points, so that conducted interference and radiated interference are weakened, and the filtering effect of the filter circuit is improved.

The invention discloses an anti-electromagnetic interference method for an electronic device in an electric dragging system, which comprises the following steps of: 1, respectively analyzing conduction and radiation type interference in the electric dragging system; 2, a second-order RLC low-pass filter is adopted; 3, selecting a control strategy and an algorithm; fourthly, inductance, capacitance and resistance parameters of the conducted interference filter are calculated; 5, selecting a random switching frequency modulation strategy; and 6, designing a rotary transformer signal processing circuit and filtering an output position angle of a decoding chip of the rotary transformer. In combination with an electrical principle of a motor driving device, firstly, an interference filter is selected, then, algorithm selection operation is performed according to selection of a control strategy, and finally, anti-interference design of electronic devices related to resolver calculation is performed, so that conduction type electromagnetic interference at a power supply end is effectively inhibited, the switching frequency harmonic content is reduced, and the reliability of a resolver is improved. And the rotor position angle is accurately tracked.

The invention provides a common-mode interference modeling and analysis method for an SLLC resonant converter, and belongs to the technical field of power electronics and electromagnetic compatibility. According to the method, a high-precision common-mode interference propagation path model is constructed by extracting key parasitic parameters of a circuit and combining a transmission line theory and an equivalent circuit modeling technology, and complex high-frequency line parasitic parameters are introduced to describe propagation characteristics of common-mode current; a model simplification strategy is provided for the problem of calculation complexity caused by high-dimensional modeling, and the analysis precision is ensured while the calculation complexity is effectively reduced through equivalent transformation and frequency domain order reduction processing; the method has the advantages of high precision, high efficiency, high universality and the like, and is suitable for common-mode interference modeling analysis and electromagnetic compatibility design of the SLLC resonant converter and other various high-frequency power electronic devices.

The invention discloses a risk prediction method for high-voltage conducted emission electromagnetic interference of an electric drive system, and the method comprises the steps: injecting a double-pulse drive signal, and synchronously collecting the switching voltage waveform of an upper bridge switching tube and a lower bridge switching tube and the waveform of switching current flowing through an inductor through an oscilloscope; performing fast Fourier transform, and extracting conducted interference spectrum data; obtaining the comprehensive insertion loss of the filter to be evaluated, testing a conduction voltage method noise value, then retesting the conduction voltage method noise value, and calculating the comprehensive insertion loss; subtracting the obtained comprehensive insertion loss of the filter from the obtained conducted interference spectrum data, and outputting a conducted voltage method evaluation result; and comparing the output evaluation result with a target limit value standard, and if the evaluation result is lower than a limit value, determining that there is no EMC risk. According to the method, accurate EMC risk assessment is finally obtained through measurement analysis and calculation, the defects of other methods are overcome, the assessment result is more accurate, and the practicability is higher.

The invention provides a chip electromagnetic compatibility automatic test method and a conducted radiation interference test platform. The method comprises the following steps: receiving a test parameter set configured by a user by using a first graphical user interface; the test parameter set comprises configuration parameters for a radiated interference test and / or a conducted interference test of the tested chip; positioning and identifying interaction elements in a second graphical user interface provided by test instrument control software of the operation instrument control end based on an image identification technology; a simulation user operation instruction is generated and executed, and test instrument control software is controlled to automatically complete test parameter setting and start a radiated interference test and / or a conducted interference test; and after the test is completed, obtaining test data output by the test instrument control software, and generating an electromagnetic compatibility test result report for the tested chip. According to the invention, the problems of separation of radiation and conduction test equipment, tedious operation, lack of integrated automatic management and control and the like in an existing chip electromagnetic compatibility test can be effectively solved.