706 results about "Electromagnetic 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 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 radio navigation and countering, and particularly discloses an unmanned aerial vehicle interference system and device based on phased array radar direction finding. The system comprises a phased array radar direction finding module, an environment electromagnetic propagation characteristic modeling module, an interference beam dynamic planning module and a digital beam forming interference module. Through constructing a three-dimensional electromagnetic propagation model and based on propagation loss and a multipath effect predicted by the model, a beamforming weight used for pre-compensating environmental influence is optimized and calculated, and finally an interference antenna array is driven to radiate an intelligent beam subjected to environmental pre-compensation, so that high-intensity interference is formed at an actual physical position of a target unmanned aerial vehicle, and the target unmanned aerial vehicle is subjected to environmental pre-compensation. Direction finding errors are overcome, and interference efficiency and electromagnetic compatibility 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 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.

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 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 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 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 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 subminiature three-coaxial differential self-locking high-temperature-resistant assembly and a connector, and relates to the technical field of radio frequency connectors, the subminiature three-coaxial differential self-locking high-temperature-resistant assembly comprises a shell, an outer shield is arranged in the shell, an outer insulator is arranged on the inner side of the outer shield, and an inner shield is arranged on the inner side of the outer insulator. According to the subminiature three-coaxial differential self-locking high-temperature-resistant assembly and the connector, efficient electromagnetic isolation is formed by the double shielding layers composed of the outer shielding layer and the inner shielding layer and the inner conductor, radio frequency leakage and signal crosstalk can be remarkably inhibited through cooperative use of the structures, the problem that a traditional double-coaxial structure is insufficient in shielding is solved, and meanwhile, the connector is high in reliability. The inner shielding layer and the outer shielding layer of the twisted pair are respectively welded with the inner shielding layer and the outer shielding layer, the continuity of the shielding effect is ensured, the connecting seat is made by sintering glass powder and is provided with a conductive silver powder sealing ring, the stability at high temperature is ensured, good grounding continuity is also provided, and the overall electromagnetic compatibility performance is further enhanced.

This invention discloses an improved Monte Carlo electromagnetic reverberation chamber electromagnetic environment modeling method and system, relating to the field of electromagnetic environment effects. The method introduces a distribution factor function to describe the distribution weight of plane electromagnetic waves on the surface of the incident sphere, combines this with Monte Carlo sampling to generate non-uniformly distributed plane electromagnetic wave parameters, calculates the electromagnetic field distribution in the simulated space based on the principle of electromagnetic superposition, and finally outputs the electromagnetic environment characteristics through post-processing. The corresponding system includes a parameter setting module, a sampling generation module, an electromagnetic calculation module, and a result processing and output module. This invention solves the problem of deviation between the simulation results and the actual reverberation chamber environment caused by the uniform distribution of electromagnetic waves in the traditional Monte Carlo method, achieving accurate simulation of electromagnetic environment non-uniformity and providing reliable support for electromagnetic compatibility testing, antenna performance evaluation, and other applications.

Embodiments of the present application provide a control system, method, device, electronic equipment and readable storage medium. The control system is applied to a server, and the control system comprises a clock generator and a detection module. In the clock generator, a plurality of clock signal output pins are connected to a plurality of corresponding control pins through lines to form a plurality of differential signal lines in the clock generator. The detection module is connected to the plurality of differential signal lines in the clock generator. The detection module is used for detecting whether the differential signal lines in the clock generator form a complete loop to obtain a detection result. According to the detection result, a result signal is returned to the clock generator. The clock generator is used for controlling whether the clock signal output pin corresponding to the differential signal line outputs the clock signal according to the received result signal. Through the control system of the embodiment, whether the clock signal is output can be automatically controlled, and the electromagnetic compatibility of the product can be improved while reducing the power consumption of the product.

The utility model relates to the technical field of electromagnetic compatibility testing, and discloses an engine controller electromagnetic compatibility experiment load box which comprises a load box shell, a working element is arranged in the load box shell, and two protection rings are fixedly connected to the outer walls of the two ends of the load box shell respectively. A plurality of heat dissipation grooves are formed in the two sides of the load box shell respectively, the top of the load box shell is detachably connected with a box cover, the inner wall of the box cover is rotationally connected with a maintenance mechanism, the close sides of the two protection rings are fixedly connected with a supporting mechanism, and the supporting mechanism comprises two connecting rods. According to the utility model, the self-adaptive support of the load box on different working table surfaces is realized, the stability of the load box when the load box is placed on a complex working table surface is ensured, the influence of vibration on internal elements caused by uneven ground is avoided, the accuracy and reliability of experimental data are ensured, and the universality and adaptability of the load box are enhanced.

The application belongs to the technical field of electromagnetic compatibility control design, and particularly relates to a marine low-ground-capacitance filter design method. The method specifically comprises the following steps: firstly, using an inductor as a main filter device, for a low-frequency band below 100 kHz, a magnetic core of the inductor uses an iron-based nanocrystalline material, for a low-frequency band from 100 kHz to 1 MHz, the magnetic core of the inductor uses MnZn magnetic material, and for a high-frequency band above 1 MHz, the magnetic core of the inductor uses NiZn magnetic material; secondly, based on the designed inductor, a multi-stage filter circuit combining low frequency and high frequency is designed; the filter circuit comprises: a plurality of common-mode inductors connected in series, a differential-mode capacitor Cx connected in parallel to both ends of the common-mode inductor, a common-mode capacitor Cy connected in parallel between a live wire and the ground, and a common-mode capacitor Cy connected in parallel between a zero wire and the ground; finally, modular packaging and glue filling are performed, so that the inductor of the filter circuit is parallel to the shell, the center position of the filter circuit is located at the center position of the shell, and overall insulation glue filling is not performed.

The invention relates to the technical field of electromagnetic compatibility (EMC) design of electronic circuits, in particular to a method suitable for a flow cytometer and capable of reducing interference of clock signals on EMC. The method comprises the steps that S100, clock circuit components are concentrated in a 5mm * 5mm area of the top layer of a PCB, routing is limited to a second layer through buried holes, and fundamental frequency is dynamically set; s200, laying copper in a key area for grounding, and adding a ground bounce suppression array to three layers; s300, arranging an upper ground copper layer and a lower ground copper layer by using a flexible circuit board; s400, covering the top circuit with a ferrite alloy cover, and welding and grounding; and S500, the flow velocity and the cell density are collected in real time, the clock frequency is dynamically adjusted, a frequency stabilization mechanism exists in an extreme scene, radiation is effectively reduced, and the detection precision and stability are improved. According to the method, the EMC interference of the clock signal of the flow cytometer is reduced from multiple dimensions of source inhibition, shielding protection, connection optimization and cooperative control.

The invention provides a three-dimensional stacked packaging substrate device and a manufacturing method, and relates to the technical field of semiconductor packaging, and the three-dimensional stacked packaging substrate device comprises a substrate which is a multi-layer stacked substrate; a drop point area corresponding to the vertical interconnection terminal is provided with a backflow channel, and the backflow channel comprises a grounding via hole array or a grounding metal ring surrounding the drop point area and is used for providing a continuous reference loop for a high-speed signal transmitted through the vertical interconnection terminal. Providing a core plate, carrying out multi-layer lamination, and manufacturing a backflow channel in a corresponding vertical interconnection terminal drop point area; manufacturing blind holes or micro holes in the substrate to realize interlayer interconnection; the substrate is divided into a high-speed digital area, an analog / radio frequency area and a power supply area according to functions for partition wiring, and the ground plane of each partition is kept continuous; a decoupling device is arranged at the near end of the vertical interconnection drop point or the chip power supply inlet. The system has the beneficial effects that low reflection, low jitter and low bit error rate of high-speed signal transmission are realized, and the electromagnetic compatibility and the working reliability of the system are improved.

An electronic cigarette radio frequency source device comprises a radio frequency function board and a shielding isolation frame fixedly connected to the radio frequency function board. The system function board is fixedly connected to the shielding isolation frame and located on the side, away from the radio frequency function board, of the shielding isolation frame; wherein an accommodating space is formed among the radio frequency function board, the shielding isolation frame and the system function board, a shielding partition plate group is integrally formed on the shielding isolation frame, and the accommodating space is divided by the shielding partition plate group. The accommodating space is divided by the shielding partition plate group, and the accommodating space in the device is divided into a plurality of areas, so that the areas in the accommodating space can effectively avoid mutual electromagnetic interference. The design that the radio frequency function board is located on the side, away from the system function board, of the shielding isolation frame, the containing space is formed among the radio frequency function board, the shielding isolation frame and the system function board, and radio frequency radiation is sealed in the containing space is adopted, so that the electromagnetic compatibility between a circuit on the radio frequency function board and a circuit on the system function board is improved.

The utility model provides a sampling circuit with high precision and strong anti-interference, which relates to the technical field of signal sampling and comprises a sensor module, an input signal of the sensor module is transmitted to a digital signal processing unit through a sampling chip, and an anti-interference circuit is arranged between the sensor module and the sampling chip; the anti-interference circuit comprises an EMC (Electro Magnetic Compatibility) device, an isolation voltage transformer and a multiple filtering loop which are connected in sequence, and the isolation voltage transformer is packaged by permalloy. According to the utility model, surge current, transient voltage and noise interference are effectively suppressed through the anti-interference circuit, signal stability is ensured, the isolation voltage transformer packaged by the slope mode alloy improves electromagnetic compatibility, common-mode voltage drift is further eliminated by combining Fourier transform, signal precision and anti-interference capability of the system are improved, and the anti-interference performance of the system is improved. And long-term stable operation is ensured.

The invention discloses a flexible circuit board and a display device. The flexible circuit board comprises a base material layer and a first conductive layer, the base material layer comprises a first bonding pad area, a second bonding pad area and a transmission line area; the first conductive layer is located on the first side of the base material layer and comprises a first bonding pad structure, a second bonding pad structure and a plurality of signal transmission lines extending in the first direction. The first bonding pad structure is located in the first bonding pad area, the second bonding pad structure is located in the second bonding pad area, the signal transmission lines are located in the transmission line area, and the transmission line area comprises a first single-layer area and a first double-layer area which are arranged in the first direction; in the first single-layer area, a first conductive layer is arranged on the first side of the base material layer, a conductive structure is not arranged on the second side of the base material layer, in the first double-layer area, a first conductive layer is arranged on the first side of the base material layer, a second conductive layer is arranged on the second side of the base material layer, and the second side and the first side are two opposite sides of the base material layer. Therefore, the flexible circuit board has relatively strong anti-electromagnetic interference capability and electromagnetic compatibility.

The utility model discloses a single foot twist break type transducing element. Including electrode plug, shell, fixed glue, solder and bridge silk. The utility model has designed single foot twist break type initiating explosive device structure in the country first, is a novel structure's transducing element for missile gyro, has higher firing reliability, twist break reliability and security, can be applicable to various gyro ignition, provides new train of thought for gyro design and structure optimization. Product adopts single foot structure electrode plug, double bridge parallel firing design, constitutes firing unit after filling detonating agent, integrates firing and working function, realizes product 700ma firing, 35MPa output pressure bearing, foot line 3.92N the twist break of cm, 59kPa vacuum ignition, damp heat, medium withstand voltage, electromagnetic compatibility, firing reliability 0.999 etc. technical index requirement. The utility model product reliability, security, versatility are high, and environmental adaptability is strong, and the technology reaches the leading level in the country, and the application prospect is wide, and military, economic benefit is remarkable.

The invention provides an emergency evacuation method for an electromagnetic compatibility test of a power battery, and the method comprises an environment monitoring module, a water tank emergency protection module, a box moving robot system module, a test wire harness cut-off module, a test room control module, a control box module, and an electromagnetic compatibility test equipment protection module. And all the modules realize safety protection in an emergency scene through signal interaction and action linkage. Through cooperation of multiple modules, the single-dimension limitation of traditional protection is broken through, personnel-equipment-environment triple guarantee is constructed, a full-chain safety closed loop is formed, a full-automatic emergency evacuation process is achieved, manual intervention is not needed from emergency situation detection to transfer of a power battery to a safety area, and the evacuation efficiency and safety are improved.

The invention discloses a direct-current busbar filtering assembly, an inverter assembly and a vehicle, and belongs to the technical field of vehicles, the direct-current busbar filtering assembly comprises an insulating shell, a high-voltage connector, a magnetic ring, a grounding piece, a plurality of Y capacitors and two busbars, the insulating shell is provided with a central through hole, a first mounting groove and a second mounting groove, the first mounting groove is wound around the outer side of the central through hole, the second mounting groove is located in the side, away from the central through hole, of the first mounting groove, the high-voltage connector penetrates through the central through hole, the magnetic ring is mounted in the first mounting groove, the grounding piece is mounted on the insulating shell, and each Y capacitor is mounted in the second mounting groove. The high-voltage connector, the magnetic ring, the grounding piece, the Y capacitors and the two busbars can be integrated and fixed on the insulating shell, the direct-current busbar filtering assembly is compact in structure and small in occupied space, meanwhile, the magnetic ring and the Y capacitors can form an efficient common-mode filter, direct current entering an inverter is filtered from the source, and good electromagnetic compatibility is achieved.