903 results about "Electro magnetic compatibility" patented technology

The invention discloses an electromagnetic emission test method of an intelligent household electrical appliance, which simulates a dynamic interaction process by controlling multiple modules to run simultaneously according to a preset logic, and comprises the following steps: acquiring electromagnetic signals in real time and performing frequency domain conversion to obtain frequency spectrum distribution; identifying a target frequency band which generates energy convergence due to non-linear superposition and peak intensity of the target frequency band; obtaining a superposition waveform sequence and classifying a nonlinear superposition mode; identifying an abnormal interference mode by combining the peak intensity and a mode classification result; associating the abnormal frequency band with the module operation log, and analyzing an interaction time sequence and logic to determine a cause; a filtering or regulation strategy is applied based on the cause, whether the peak value is reduced is verified and a report is generated. According to the invention, through energy convergence frequency band identification, non-linear superposition mode classification, interference cause tracing, directional regulation and closed-loop verification, accurate diagnosis and root positioning of hidden transient interference are realized, so that the test depth is improved, the rectification efficiency is optimized, and the predictability of product electromagnetic compatibility design is enhanced.

The invention provides an electrocardiograph electromagnetic compatibility test data diagnosis method based on an intelligent sensor, and relates to the technical field of electrocardiograph electromagnetic compatibility test. The method includes generating structured test data. And calculating a theoretical interference reference threshold. And generating an initial interference judgment atlas arranged according to the interference time sequence. And constructing a dynamic compensation coefficient matrix, and injecting the dynamic compensation coefficient matrix into the initial interference determination map to obtain a dynamic interference determination map. And calculating the characteristic similarity between the real-time test data in each interference time sequence window and the dynamic interference judgment map, and diagnosing the electromagnetic compatibility state of the electrocardiograph. According to the invention, through multi-dimensional data acquisition and interference identification, through a dynamic reference threshold and a compensation mechanism, environment and equipment state changes are adapted, the diagnosis stability of a complex scene is improved, through real-time data comparison and traceability, the equipment state is rapidly judged, the interference source is positioned, the debugging time is shortened, and finally the measurement accuracy of the electrocardiograph is guaranteed.

The invention relates to the technical field of electromagnetic compatibility and signal processing, and discloses a multi-dimensional feature fusion-based electromagnetic leakage signal classification and identification method, which comprises the following steps of: preprocessing an original electromagnetic signal to obtain standardized data, extracting time domain, frequency domain and space domain features to construct a nine-dimensional feature vector, and extracting a three-dimensional feature vector; constructing an initial feature library and completing the initial feature library through a self-supervision verification mechanism, training the initial feature library through a CNN-LSTM fusion model with an attention mechanism to obtain a classification model, classifying signals to be identified, starting a self-supervision reinforcement learning mechanism optimization model according to an F1 score, and dynamically optimizing the feature library each month; the method solves the defects of the traditional technology, improves the recognition accuracy and the system adaptability, and can be used for cable information safety leakage protection.

The invention relates to the technical field of electromagnetic compatibility, in particular to a new energy automobile electronic part EMC (Electro Magnetic Compatibility) multi-dimensional simulation verification method, which comprises the following steps of: based on a geometric structure and material attributes of a new energy automobile electronic part, identifying an abnormal field intensity region, extracting a signal path and an electromagnetic wave incident direction, and analyzing an overlapping relationship between the signal path and the electromagnetic wave incident direction; according to the method, the electromagnetic field distribution and the interference source of the parts are accurately modeled and analyzed, the shielding and filtering design is optimized, the electromagnetic compatibility is improved, the interference coupling point is identified, the shielding effectiveness and the filtering effect are evaluated, the optimization policy is identified, the electromagnetic field distribution after optimization is analyzed, the fluctuation data of the external electromagnetic field is captured, and the influence evaluation list of the external electromagnetic field is generated. The reliability of the design under actual working conditions is ensured, electromagnetic interference is prevented, stable work of parts in a variable electromagnetic environment is ensured, the electromagnetic compatibility of the whole automobile is improved, the influence of electromagnetic interference on the functions of the new energy automobile is reduced, the design effect is optimized, and the performance and safety are improved.

The invention discloses a high-performance ship cable and a preparation process thereof, relates to the technical field of cables, and aims to solve the problem that an existing cable is insufficient in environmental adaptability, safety, electromagnetic compatibility and the like, the cable comprises a conductor, an insulating layer, a longitudinal waterproof structure, a shielding layer and a sheath layer from inside to outside, the conductor is of a multi-strand soft copper wire stranded structure, and the copper content of the multi-strand soft copper wire stranded structure is larger than or equal to 99.95%; the DC resistance at 20 DEG C is less than or equal to 0.01724 omega mm / m; the insulating layer is made of cross-linked polyethylene or polytetrafluoroethylene and can resist 1.5 times of rated voltage for 1 minute without breakdown; the longitudinal waterproof structure comprises a water-blocking tape and water-blocking paste; the shielding layer is of a double-layer structure, and the shielding effectiveness is larger than or equal to 60 dB The sheath layer is made of a low-smoke halogen-free flame-retardant material and contains an antioxidant and an ultraviolet light absorber, the preparation process comprises six steps of conductor preparation, insulating layer forming and the like, parameters are accurately controlled, the cable can work at the temperature of-40 DEG C to 85 DEG C, is salt-fog-resistant, waterproof and flame-retardant, is adaptive to the complex environment of ships and warships, and the operation reliability and safety are improved.

The invention relates to an electromagnetic compatibility and radio frequency coexistence framework, and belongs to the technical field of vehicle-mounted display and electromagnetic compatibility. The device comprises a display module and a control system which are arranged outside a vehicle body, the control system is provided with a cooperative control unit, an electromagnetic interference suppression module and a running state monitoring and adjusting module to form a closed-loop framework, and the closed-loop framework is used for dynamically managing display signals, power and a time sequence in the running process of the vehicle, suppressing conduction and radiation interference and controlling the running state of the vehicle. And the coexistence performance of the external display and the vehicle-mounted radio frequency system is ensured, and the electromagnetic compatibility regulations are met. Further, the system comprises an integrated topology unit, a coexistence monitoring unit and a strategy execution unit, driving time sequence shaping, backflow path constraint and power supply ripple shaping are achieved, and when interference exceeds a threshold value, the system is switched to a controlled display state. A shielding-grounding-filtering three-in-one layout and a driving time sequence shaping unit can be adopted. According to the invention, the safety and reliability of external display in the aspects of electromagnetic compatibility, radio frequency coexistence and service life management are ensured.

The invention discloses an intelligent switching control method and system for a double-voltage automobile generator, and relates to the technical field of automobile electrical control, and the method comprises the following steps: S001, constructing a frequency response baseline of an automobile power distribution network, and calibrating an inductance parameter of a wiring harness and a capacitance parameter of a filter based on frequency response measurement data; and generating an inherent frequency distribution diagram for reflecting the dynamic electrical characteristics. According to the method, the frequency response base line and the harmonic characteristic spectrum are constructed, so that accurate identification and dynamic prediction of the resonance risk are realized; avoiding the inherent frequency by adopting a multi-level control frequency planning strategy; virtual impedance and an active damping mechanism are introduced to improve the switching stability; and closed-loop optimization control is constructed in combination with residual signal feedback, and continuous convergence of the control performance is realized. According to the overall scheme, the stability, robustness and electromagnetic compatibility of the voltage switching process are improved, and safe operation of the double-voltage architecture under complex working conditions is guaranteed.

The invention provides a miniaturized broadband non-reflection filtering antenna and communication equipment, and relates to the field of communication antennas. The antenna comprises a hybrid coupling resonance system and a matched absorption network, wherein the hybrid coupling resonance system comprises a main radiation groove which is formed in a metal floor and is of a split ring structure, and two parasitic radiation grooves which are of a U-shaped structure and are located on the two sides of the main radiation groove respectively; the matching absorption network comprises an absorption resistor connected with the feed microstrip line in parallel and an absorption microstrip line connected with the absorption resistor in series. According to the embodiment of the invention, the absorption circuit is integrated on the structure, so that the antenna has the non-reflection characteristic in the range of 1.27-2.31 GHz far beyond the radiation bandwidth, the defect that the radio frequency front-end performance is deteriorated due to in-band reflection and out-of-band energy reflection back to a transmitting channel of a traditional antenna is effectively overcome, and the electromagnetic compatibility and the linear characteristic of the whole system are remarkably improved.

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

The application relates to the technical field of high-voltage switch cabinets, in particular to a high-voltage switch cabinet convenient to maintain, which comprises a cabinet body and a cabinet door arranged on the cabinet body, a through hole extending along the arrangement direction of the cabinet door and the cabinet body is arranged on the cabinet door, an observation window, a shielding plate with mesh holes and a shielding net are arranged on the cabinet door, the mesh holes of the shielding plate and the shielding net are different in size, the observation window, the shielding net and the shielding plate are sequentially arranged along the arrangement direction of the cabinet door and the cabinet body, and the observation window, the shielding plate and the shielding net are all located on the surface of the cabinet door close to the cabinet body and cover the through hole. The shielding plate with mesh holes and the shielding net are arranged to form a multilayer electromagnetic shielding structure, the shielding plate and the shielding net can filter electromagnetic interference of different frequencies in a synergistic manner, and the electromagnetic compatibility is significantly improved.

The invention discloses an electromobile electromagnetic compatibility testing device, and relates to the technical field of electromagnetic compatibility testing, the electromobile electromagnetic compatibility testing device comprises a shielding box, the upper side of the shielding box is fixedly connected with a control box, and one side of the control box is provided with a manipulator used for clamping an electromobile motor to go in and out of the shielding box; one side of the manipulator is provided with an opening and closing mechanism used for opening and closing the entrance, the lower side of the control box is slidably connected with a load simulation circuit box used for regulating and controlling a power supply and emitting high-energy pulses through a circuit, and one side of the load simulation circuit box is fixedly connected with a second handle. One side of the second handle is provided with a wiring terminal, and the wiring terminal is fixedly connected with the load simulation circuit box. A dynamic test platform capable of highly simulating a real world complex scene is created, and the tested motor is driven to move along a U-shaped track in the shielding box through a precise mechanical structure; and working conditions such as straight running, steering and backing of the vehicle can be accurately reproduced.

A battery pack with electromagnetic compatibility (EMC) for an electric vehicle is presented that includes a battery pack housing, at least one battery module enclosed within the battery pack housing, and an electronics assembly enclosed within the battery pack housing, in which the electronics assembly comprises a DC-DC converter and an electronics assembly casing, wherein at least one of the electronics assembly and battery pack housing includes an electromagnetic interference (EMI) shield to enable EMC. The electronics assembly includes a battery management system (BMS) circuit board and a DC-DC converter control circuit board and a DC-DC converter power electronics board. The electronics assembly is of substantially a same dimension of a battery module, in which the EMI shield comprises at least one of a metallic screen, metallic wires, a metallic tape, a metallic sheet, a metallic coating, paramagnetic materials, carbon based materials and metallic and / or carbon particle-infused composites.

The invention provides an integrated antenna integrating Beidou, low-orbit and Tiantong satellite communication and high-precision navigation positioning. A low-orbit satellite microstrip antenna, a GNSS high-precision microstrip antenna, a Tiantong microstrip antenna and a Beidou short message microstrip antenna are sequentially stacked on the upper surface of a PCB in a conical mode. A shielding cover is arranged on the lower side of the PCB; antenna radiation patches of the low-orbit satellite microstrip antenna are arranged on the outer edges of the upper surface and the lower surface of the low-orbit satellite antenna substrate and are not covered by the GNSS high-precision microstrip antenna; circuits of the low-orbit satellite microstrip antenna and the sky-pass microstrip antenna are arranged on the upper surface of the PCB circuit substrate. And circuits of the GNSS high-precision microstrip antenna and the Beidou short message microstrip antenna are arranged on the lower surface of the PCB. According to the invention, the four-in-one combined design of the antenna, the low-orbit satellite antenna, the Beidou short message antenna and the high-precision navigation antenna is adopted, so that the problem of performance insufficiency when each antenna is used independently is solved, complementation among the antenna, the low-orbit satellite antenna, the Beidou short message antenna and the high-precision navigation antenna is realized, and the cost is reduced; the electromagnetic compatibility between the antennas is improved through frequency band and polarization isolation design, and the stability of a communication link is guaranteed through interference resistance of the peripheral low-orbit satellite antenna.

The invention discloses a circuit board testing and quality screening automation method and system, and aims to solve the problems of low efficiency, insufficient precision and imperfect quality control of traditional circuit board testing. Precise positioning of the circuit board is achieved through the high-precision X / Y / Z three-dimensional positioning mechanical arm, parallel testing is conducted in combination with equipment such as a multi-channel oscilloscope, a signal source and a spectrum analyzer, and the testing efficiency is improved. Temperature and humidity control testing is carried out through the environment simulation bin, the thermal imager scans temperature distribution of the circuit board, a high-precision instrument is used for detecting signal integrity and analyzing electromagnetic compatibility, and the performance of the high-speed circuit board is ensured. A machine learning algorithm predicts potential faults, a test process is optimized, an automatic sorting system is adopted to separate qualified and unqualified circuit boards, and high consistency and high reliability of product quality are ensured. Through the automatic and intelligent testing process, the production efficiency, the quality control capability and the testing precision are greatly improved, and the labor cost and the production risk are reduced.

The invention discloses an electromagnetic compatibility detection method and device of a rail transit signal system and electronic equipment, and relates to the technical field of electromagnetic safety. Determining an actual electromagnetic compatibility area corresponding to the equipment according to the actual distance between the actual installation positions of the multiple pieces of equipment of the rail transit signal system and a target reference line on a rail; and determining the electromagnetic interference risk condition between the relation pairs based on the electromagnetic interference information of the actual electromagnetic compatibility area corresponding to the equipment. According to the method, the electromagnetic interference scene of the actual rail transit signal system is analyzed to cover the random and coexisting electromagnetic interference combination of the field, so that the confidence coefficient of the risk assessment result in the complex electromagnetic environment of the field is improved, and the analysis is ensured to cover the random and composite scene which cannot be reproduced by the standard test; moreover, the electromagnetic interference risk condition between a relation pair formed by a plurality of devices in the rail transit signal system is determined, that is, systematic evaluation of complex electromagnetic interaction is realized through system-level analysis.

The invention relates to the technical field of interference suppression, in particular to an electromagnetic compatibility optimization method and system for a ship shaft frequency converter, and the method comprises the steps: carrying out the term-by-term judgment of sensitive interference energy, current errors and switching loss after the discretization and jump limitation based on a frequency sequence, and screening out a boundary-crossing sequence, the genetic algorithm executes cross combination and amplitude superposition in the residual sequence, a new frequency set is formed through transformation and rearrangement, frequency points are distributed in a plurality of intervals to be reorganized, the switch state is predicted and updated one by one through Kalman filtering, observation residual errors are corrected in real time, and the frequency points are reorganized. The harmonic distortion rate, the radiation intensity and the instruction change amplitude are synchronously output by taking the time index as a sequence, the deviation is compensated at the amplitude and phase level, the harmonic index and the radiation index are controlled in an agreed range, the switching loss and the instruction change are within threshold values, and a complete closed loop covering frequency generation, harmonic correction and sequence updating is formed.

The invention is applicable to the field of millimeter wave equipment monitoring, and provides a 5G millimeter wave equipment monitoring method and system in an extreme electromagnetic environment, and the method comprises the steps: collecting real-time parameter data; synchronous acquisition of multi-source data is realized by adopting a distributed sensor network; constructing a multi-dimensional data association model, and associating a coupling relationship among the electromagnetic compatibility parameter, the radio frequency performance parameter, the equipment state parameter and the environmental adaptability parameter through a machine learning algorithm; based on a preset typical scene feature library, scene classification identification is carried out on the real-time parameter data through a deep learning model; dynamically generating a differential monitoring strategy according to a scene classification recognition result; feeding back the differential monitoring strategy to a control module corresponding to the equipment, and triggering a self-adaptive regulation and control measure; through multi-dimensional cooperative monitoring and dynamic regulation and control, accurate state perception and intelligent response of 5G millimeter wave equipment in an extreme electromagnetic environment are realized, a parameter coupling relationship is effectively mined, and multi-scene complex requirements are met.

The invention relates to the technical field of electromagnetic compatibility automatic testing, in particular to a power line audio conduction sensitivity automatic testing and switching system which comprises a multi-mode testing module, a data recording module, a testing analysis module, a testing control module and a result dividing module. Three test modes of high sensitivity, conventional sensitivity and low sensitivity are set, and a programmed switch group is utilized to automatically switch the connection relation between a capacitor and a coupling transformer, so that automatic configuration of different interference intensity test environments is realized. And the system automatically determines a subsequent test direction by analyzing conduction fluctuation characteristics of the transmission subsystem, and intelligently grades the anti-interference capability of the equipment based on a final test result. The problems that manual wiring is complex, efficiency is low and errors are prone to occurring in traditional testing are solved, automation and intellectualization of the testing process are achieved, testing efficiency and accuracy are remarkably improved, and meanwhile a reliable basis is provided for applicability evaluation of equipment in different electromagnetic environments.

The invention provides a method and system for detecting electromagnetic compatibility efficiency of a wave-absorbing material and a storage medium, and relates to the technical field of electromagnetic compatibility efficiency detection. The method comprises the following steps: firstly, carrying out first electromagnetic measurement on a target area of the electronic equipment when a wave-absorbing material is not laid to obtain a first near-field scattering parameter set; and carrying out local minimum detection and amplitude and space distribution threshold presetting on the parameter set to screen out problem resonance frequency points. And laying the to-be-measured wave-absorbing material in the target area, and carrying out second electromagnetic measurement according to the same measurement condition to obtain a second near-field scattering parameter set. And comparing the two measurement data, calculating the local variable quantity, the space average suppression degree and the peak suppression ratio of each problem resonance frequency point, and constructing a comprehensive efficiency index on the basis of the local variable quantity, the space average suppression degree and the peak suppression ratio, thereby realizing quantitative evaluation on the overall efficiency and the local hot spot suppression capability of the wave-absorbing material. And finally, judging whether the electromagnetic compatibility efficiency of the material reaches the standard or not according to the space average suppression degree and the comprehensive efficiency index. Accurate evaluation of the electromagnetic compatibility efficiency of the wave-absorbing material is realized.

The invention discloses an electromagnetic compatibility integrated protection system for an electric driving system of an electric vehicle, which relates to the technical field of electromagnetic compatibility protection and comprises a multi-dimensional parameter synchronous sampling module for acquiring an operation condition characteristic sequence of a target electric driving system in a preset time window; the space-time diagram isomorphic prediction module outputs a predicted interference frequency domain feature vector corresponding to the current control period; the collaborative anti-interference resolving module is used for respectively calculating a carrier frequency band spread spectrum instruction aiming at a bottom microcontroller and a reverse compensation injection current aiming at an active filtering loop; and the bottom hardware reconstruction execution module is used for updating a carrier frequency register of a pulse width modulation generator in the target electric driving system according to the carrier frequency band spread spectrum instruction and synchronously controlling the active filtering loop to output the reverse compensation injection current. According to the invention, the accurate pre-judgment capability of electromagnetic interference of the electric driving system of the electric vehicle and the long-term stability of full-life-cycle electromagnetic compatibility protection are improved.

The invention discloses a ground plane segmentation method and device for a hybrid PCB, and belongs to the field of PCB design, and the method comprises the steps: inputting the characteristic parameters of the hybrid PCB into a land division decision model, enabling the land division decision model to carry out the layer-by-layer judgment according to the characteristic parameters, and outputting a first land division strategy; constructing an electromagnetic simulation model based on the first land division strategy, executing predefined simulation analysis according to the electromagnetic simulation model, and optimizing the first land division strategy through a preset optimization rule base when a simulation analysis result does not meet a preset requirement to generate a second land division strategy; and based on the first land division strategy or the second land division strategy, automatically generating a segmentation line through PCB design software, and placing a connection bridge and a compensation element so as to complete the ground plane segmentation of the hybrid PCB. Therefore, by implementing the method, the targeted ground plane segmentation design can be performed according to the related parameters of the hybrid PCB, so as to ensure the signal integrity and electromagnetic compatibility of various hybrid PCBs.

The invention provides a power grid interference monitoring and auxiliary diagnosis system. Based on a preset intelligent threshold value, when parameter fluctuation continuously exceeds 6dB, a data abnormity alarm is triggered, and hardware abnormity such as a sensor or a board card fault can be identified; calculating the total risk score of the power grid by quantitatively analyzing a plurality of parameters such as a voltage effective value, a frequency, a harmonic effective value, THD, low-frequency / radio-frequency conducted emission and a peak, and dividing the risk grades into'normal ', 'high risk' and'high risk '; the upper computer supports dynamic query, visual display and Excel export of historical data; an integrated interference auxiliary diagnosis function is combined with a typical database and a high-power equipment working condition information base, so that interference source equipment and abnormal frequency points can be automatically identified, and a diagnosis report is generated; the system is suitable for complex platforms such as ships and aircrafts, full-life-cycle electromagnetic compatibility management of a power grid is achieved, and the stability and safety of the system are improved.

The invention relates to the technical field of schematic diagram processing, and provides an electromagnetic compatibility analysis method and device for a circuit schematic diagram, equipment and a medium, and the method comprises the steps: obtaining an electromagnetic compatibility design rule of the circuit schematic diagram and a training data set of the circuit schematic diagram; training a preset deep neural network model by using the electromagnetic compatibility design rule and the training data set to obtain a schematic diagram analysis model; obtaining a schematic diagram of a circuit to be analyzed; analyzing the schematic diagram of the circuit to be analyzed by using the schematic diagram analysis model to determine whether the schematic diagram of the circuit to be analyzed accords with an electromagnetic compatibility design rule; outputting the schematic diagram of the circuit to be analyzed in response to the condition that the schematic diagram of the circuit to be analyzed accords with the electromagnetic compatibility design rule; and outputting corresponding analysis and review result information and optimization scheme information in response to the condition that the electromagnetic compatibility design rule is not met. Through the technical scheme, the efficiency is greatly improved, the cost is reduced, and the capability level difference between different engineers is eliminated to a great extent.

The invention provides an electromagnetic compatibility calibration method and system for portable unmanned aerial vehicle navigation decoy equipment. According to the method, firstly, a portable unmanned aerial vehicle navigation decoy device is used for sensing space electromagnetic field distribution, meanwhile, satellite navigation multi-path interference signal characteristics are captured, then coupling analysis is conducted on the space electromagnetic field distribution and the satellite navigation multi-path interference signal characteristics, and a dynamic electromagnetic compatibility disturbance atlas is generated; then, a radio frequency emission waveform of the handheld unmanned aerial vehicle navigation decoy device is dynamically reconstructed by adopting a bionic immune optimization principle, and finally, the radio frequency emission waveform and the outdoor electromagnetic environment which changes in real time are adaptively matched through an iterative feedback mechanism, so that online calibration is completed; according to the technical scheme provided by the invention, the equipment can automatically adapt to a complex and changeable outdoor electromagnetic environment through a cooperation mechanism of multi-source environment perception and dynamic waveform reconstruction, and continuous effectiveness and electromagnetic compatibility of navigation decoy operation in a real-time changing environment are ensured.

The invention discloses a chip radiation emission test method, device and equipment and a storage medium, and relates to the technical field of chip electromagnetic compatibility design and simulation, and the method comprises the steps: constructing a target packaging body model corresponding to a to-be-tested chip; constructing a target test circuit board model corresponding to the to-be-tested chip; determining a target scattering parameter corresponding to the target to-be-measured electromagnetic structure; based on the target scattering parameters, the target to-be-tested electromagnetic structure is connected to the first simulation model, the second simulation model and a voltage source model and a current source model matched with the target to-be-tested electromagnetic structure, and a test link of the target to-be-tested electromagnetic structure is constructed; performing frequency response analysis on the test link, and determining radiation emission energy data of an output port of the transverse electromagnetic wave cell model; and generating a corresponding amplitude-frequency characteristic curve based on the radiation emission energy data. According to the method, the early simulation test of the radiation emission characteristic of the chip can be realized, and the research and development efficiency of the chip is remarkably improved.

The invention belongs to the technical field of semiconductors and packaging of the semiconductors, and particularly relates to a directional liquid cooling-graded rollback dual-band radio frequency receiving and transmitting integrated component, which realizes integrated integration of devices, heat dissipation and wiring through a multi-layer glass-based packaging substrate and is matched with a closed grounding TGV fence to improve dual-band electromagnetic compatibility. The first temperature-sensitive TGV, the second temperature-sensitive TGV and the first power supply branch current sampling resistor are utilized to form a combined heat and power monitoring system, and a directional gradient type copper-filled heat-conducting TGV is combined to realize directional dredging of heat flow. The double-acting-element micro-jet liquid cooling structure controls the main jet impact cavity and the offset auxiliary jet cavity through the adjustable micro throttle valve, and targeted cooling and thermal migration interception are achieved. And the controller is used for judging the over-drive thermal migration of the driving stage, the overheating of the final stage and the overload working condition of the full link based on the temperature, the current and the gain compression amount, adjusting the cooling flow in a linkage manner, and executing graded power back-off and smooth recovery on the first power supply branch and the second power supply branch, so that the radio frequency performance is ensured, and the reliability and the working condition adaptability of the high-power component are improved at the same time.

The invention discloses a printed circuit board, a layout method thereof and a vehicle, and relates to the technical field of printed circuit board layout. The method comprises the following steps: connecting a capacitor in series on a differential signal line of a physical layer chip; carrying out hollowing processing on the adjacent layer corresponding to the pin bonding pad based on a preset hollowing strategy; carrying out region division on the inner layer of the printed circuit board so as to divide the inner layer into a plurality of different regions; a plurality of backflow via holes are formed beside layer changing via holes of a circuit of the printed circuit board based on a preset setting strategy, and the backflow via holes are used for providing layer changing channels for backflow currents of the circuit on a reference plane when layers of the circuit are changed. By implementing the PCB design measures of capacitor series filtering, pad adjacent layer hollowing, inner layer segmentation and isolation and backflow via hole optimization, the problem that electromagnetic compatibility radiation and conducted emission exceed the standard due to PHY circuit filtering loss, impedance mismatch, power ground noise coupling and unreasonable high-speed signal backflow path in the traditional TBOX design is effectively solved.

The invention discloses an active noise reduction method and device for an automobile electromagnetic compatibility test. The method comprises the following steps: acquiring an original interference noise signal through a pre-arranged reference sensor array; processing the original interference noise signal through a pre-constructed intelligent noise reduction model to obtain a noise reduction control signal; a noise reduction signal is emitted according to the noise reduction control signal, and an electromagnetic field counteracting the original interference noise signal is formed; detecting the offset resultant field intensity signal in real time through a pre-arranged error sensor; and performing parameter optimization on the intelligent noise reduction model according to the synthesized field intensity signal. According to the method, the problem that the test accuracy is seriously influenced by environmental background noise and electromagnetic interference generated by test equipment in an automobile electromagnetic compatibility test can be solved.

The present disclosure relates to the technical field of electromagnetic compatibility test and evaluation, and particularly relates to a method and system for predicting electromagnetic radiation intensity of an integrated isolation chip. The method comprises: converting a first electromagnetic field model of a transformer into an equivalent circuit model, and obtaining simulated parasitic electrical parameters; comparing the measured parasitic electrical parameters with the simulated parasitic electrical parameters to adjust the equivalent circuit model; inputting the common-mode current of the adjusted equivalent circuit model as an excitation signal into a second electromagnetic field model of a PCB evaluation board to obtain an electromagnetic radiation intensity simulation result of the integrated isolation chip, wherein the common-mode current is determined as the main radiation source of the integrated isolation chip; comparing the electromagnetic radiation intensity simulation result with an electromagnetic radiation intensity measurement result to adjust the second electromagnetic field model, and obtaining an electromagnetic radiation intensity prediction model of the integrated isolation chip. The present disclosure can accurately predict the radiation intensity of the isolation chip, reduce the necessity of multiple rounds of sampling and testing, and improve the reliability and stability of chip design.

The invention discloses a wave-absorbing box structure based on center expansion and a use method thereof, and relates to the technical field of electromagnetic shielding and electromagnetic compatibility test equipment, the wave-absorbing box structure comprises a supporting column, a top plate and a bottom plate, the top plate and the bottom plate are sequentially and fixedly arranged at the upper end and the lower end of the supporting column, and the supporting column, the top plate and the bottom plate form a wave-absorbing box core frame; compared with a traditional integrated wave-absorbing box, the wave-absorbing box has the advantages that a center unfolding type structure is constructed among the supporting columns, the top plate and the bottom plate, so that the vertical plates can be unfolded from a vertical state to a horizontal state under the action of the synchronous unfolding mechanism, four vertical surfaces of the whole wave-absorbing box are all in an open state when a to-be-tested sample is replaced, and the to-be-tested sample is replaced; the actions of unloading an old large object sample from the whole wave-absorbing box and feeding a new object sample to be tested into the inner cavity of the wave-absorbing box can be synchronously carried out, so that the old object sample does not need to be completely moved away and then the new object sample does not need to be moved into the inner cavity of the wave-absorbing box, the replacement process time is greatly shortened, and the overall operation efficiency is improved.