88results about How to "EMI suppression" patented technology

The invention relates to the technical field of semiconductor equipment, in particular to an intelligent electromagnetic interference suppression system for semiconductor equipment. The system comprises a sensor network which is installed at an electromagnetic interference key position of semiconductor equipment, monitors and collects electromagnetic data of the semiconductor equipment in real time, and sends the electromagnetic data to a central data processing module; the central data processing module is used for analyzing the received electromagnetic data, identifying and positioning an interference source based on an interference source positioning model of a machine learning algorithm, performing behavior prediction analysis on the interference source, generating a self-adaptive interference suppression strategy and sending an interference suppression instruction; and the feedback control module is used for executing a feedback control action based on the interference suppression instruction, realizing real-time suppression of multi-level electromagnetic interference of the semiconductor equipment and feeding back a suppression effect. According to the invention, real-time effective suppression of electromagnetic interference is realized, and the process stability and the control precision of semiconductor equipment are remarkably improved.

The invention provides a hovering type wireless charging control method for an electric power inspection unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicles. According to the technical scheme, firstly, modeling is conducted on a multi-transmitting-stage magnetic coupling type wireless electric energy transmission system, then directional constant-voltage output parameters of a wireless charging system in a coil offset state are determined, and control parameters of the wireless electric energy transmission system of the unmanned aerial vehicle are determined; on the basis, modeling is carried out for unmanned aerial vehicle power inspection power consumption and the charge state, and multi-source disturbance suppression parameters of the unmanned aerial vehicle and attitude track full-time-domain preset time control parameters of the unmanned aerial vehicle are determined. According to the method, a multi-transmitting-stage MCR-WPT system is adopted, a directional constant voltage output model is constructed, meanwhile, a charging system control strategy is optimized, and a wireless charging scheme based on an LCC-S type compensation network is designed. According to the invention, the transmission efficiency and stability of the wireless charging system of the electric power inspection unmanned aerial vehicle are improved, and the hovering wireless charging control precision of the electric power inspection unmanned aerial vehicle is improved.

The invention belongs to the technical field of electromagnetic interference elimination, and discloses a method and system for processing electromagnetic leakage interference of an electromagnetic vibration table, and the method comprises the steps: starting a signal collection and analysis module, monitoring an electromagnetic signal generated in the operation process of the electromagnetic vibration table in real time, and recognizing an interference frequency range; a proper filter is selected or designed based on the identified frequency range through a filter selection and design module; a filter processing unit is utilized to install filters on necessary power lines and signal lines, and interference suppression measures are executed; the test and optimization module is operated, the filtering effect is evaluated, the configuration of the filter is adjusted according to needs, and the electromagnetic interference suppression effect is optimized; and the monitoring and adjusting module is continuously executed to adapt to the change of an experimental environment, so that long-term effective electromagnetic interference control is ensured. The invention provides a solution which is more accurate, effective and flexible compared with the traditional physical shielding, and is suitable for the occasion of carrying out high-precision vibration test on the magnetic sensitive sample.

The invention relates to a super-junction semiconductor device, and relates to the technical field of semiconductors, and the device comprises a semiconductor material layer which comprises an upper surface and a lower surface which are opposite to each other; the super junction structure is located in the semiconductor material layer and comprises a plurality of first conductive type columns and second conductive type columns which are alternately arranged; the first conductive type well region is located in the semiconductor material layer and located at the top end of the first conductive type column, and the first conductive type well region comprises a first type well region and a second type well region; a gate electrode on the upper surface; the first conductive plug penetrates through the grid electrode and is conductively connected with the first type of well region; the second conductive plug is positioned on the grid electrode and is conductively connected with the grid electrode; the upper part of the second-type well region is covered by a grid electrode, and the second-type well region is insulated and isolated from the first conductive plug and the second conductive plug; the second type of well region extends from the core region to the terminal region, and the second type of well region and the first type of well region are vertically arranged in the core region and the terminal region. Therefore, the anti-electromagnetic interference capability of the device is enhanced.

The invention relates to the technical field of power supply integrated management control, in particular to a power supply integrated management control system for all modules of a thermal infrared detection system. The method comprises the following steps: a power supply conversion unit converts a direct-current power supply into multi-path voltage and detects surge current at a power supply inlet; the distribution management unit distributes multiple paths of voltage to different modules and provides multi-voltage conversion and stable output for specific modules; the protection suppression unit is used for controlling current surge, constructing a self-adaptive electromagnetic shielding layer by using a Fermi shielding effect, and suppressing electromagnetic interference in multi-module power supply; the intelligent monitoring unit calculates fractal dimensions and establishes a fault fractal graph to monitor the working state of each power supply module in real time; and the redundancy switching unit is used for providing a redundancy power supply for the thermal infrared detection system. The module power supply integrated management control system of the thermal infrared detection system realizes electromagnetic environment interference suppression through a self-adaptive electromagnetic shielding technology of a Fermi shielding effect, and constructs a fault fractal graph to monitor the operation state of each module in real time.

The invention provides an electromagnetic interference suppression method and device for a PWM signal, electronic equipment and a storage medium, and relates to the technical field of vehicles, and the method comprises the steps: obtaining a PWM signal generated by a drive circuit and an original drive frequency of the PWM signal, the original drive frequency being a higher harmonic frequency corresponding to the PWM signal; at least one first target driving frequency corresponding to the original driving frequency is determined, the first target driving frequency is different from the original driving frequency, the first target driving frequency is any driving frequency in a preset driving range, and the at least one first target driving frequency is not completely the same; and controlling the driving circuit to drive based on the at least one first target driving frequency. According to the invention, the electromagnetic interference of the PWM signal can be effectively suppressed, and the harmfulness of EMI radiation interference is reduced.

This application discloses a circuit board integrated within the rear cover of a motor, applicable to the field of electronic circuits. This circuit board integrates an electromagnetic compatibility (EMC) suppression circuit and a Hall sensor signal feedback circuit with memory function. The EMC suppression circuit, used to suppress electromagnetic interference from the motor, includes an EMC filter, a transient voltage suppression diode, a first filter capacitor, a second filter capacitor, and the motor itself. The Hall sensor signal feedback circuit includes a Hall sensor, a third filter capacitor, and a pull-up resistor. The Hall sensor is a bipolar latching type, used to output speed and position feedback signals based on the magnetic field of a bipolar magnetic ring mounted on the motor rotor. Thus, through the coordinated operation of the EMC filter, the transient voltage suppression diode, and multiple filter capacitors, the EMC of the motor is improved.

The invention discloses a shielding film installation method, shielding film installation equipment, a storage medium and a product, and relates to the technical field of electromagnetic interference, and the shielding film installation method specifically comprises the following steps: determining a shielding film material combination corresponding to a to-be-installed electronic component, the shielding film materials in the shielding film material combination are assembled to obtain a target shielding film; obtaining an electronic component size corresponding to the to-be-installed electronic component, and determining a copper exposure area corresponding to the to-be-installed electronic component according to the electronic component size; and fixing the target shielding film to the to-be-mounted electronic component based on the copper exposure area to obtain a target electronic component. According to the invention, it is ensured that the shielding film covering the electronic component can effectively absorb electromagnetic interference generated by the electronic component, so that the electromagnetic interference generated by the produced electronic component can be effectively suppressed, and the quality of the electronic component can meet user requirements.

The application belongs to the field of vehicle-mounted refrigerators, and discloses a dual-temperature cooperative acquisition circuit, an intelligent temperature measurement method and a vehicle-mounted refrigerator, which comprise: a synchronous acquisition unit, which is used for synchronously acquiring temperature signals of at least two target regions of the vehicle-mounted refrigerator and outputting corresponding temperature analog signals; an anti-interference processing unit, which is connected with the output end of the synchronous acquisition unit and is used for filtering various interference signals in the vehicle-mounted environment; an adaptive signal conditioning unit, which is connected with the output end of the anti-interference processing unit and is used for adaptively amplifying, filtering and linearizing the temperature analog signals; a main control unit, which is connected with the output end of the adaptive signal conditioning unit and is used for digitizing the temperature signals, performing algorithm operation and logical control; and a wide-adaptive power supply unit, which is connected with the synchronous acquisition unit, the anti-interference processing unit, the adaptive signal conditioning unit and the main control unit and is used for providing a stable working voltage that is adapted to the vehicle-mounted power supply.

The application relates to the technical field of LED circuit, in particular to a lamp color adjusting circuit with a thyristor light modulation module, which comprises a rectifier circuit, a multi-grade dial code color adjusting circuit, a frequency flash removing circuit, a thyristor current discharge circuit and a constant current light modulation circuit. The rectifier circuit converts an alternating current power supply into a direct current voltage to supply power to a circuit system. The multi-grade dial code color adjusting circuit adjusts the current distribution of LED lamp beads through a dial code switch and a second group of resistors, generates a color adjusting signal, carries out low-pass filtering and dynamic compensation on the color adjusting signal, and outputs a pure control signal to the thyristor current discharge circuit. The thyristor current discharge circuit adjusts a current path according to the control signal to provide a smooth and adaptive power supply for the constant current light modulation circuit. The constant current light modulation circuit realizes constant current output. The design significantly reduces the hardware cost and the complexity of the circuit system, effectively suppresses electromagnetic interference in combination with the low-frequency modulation characteristics of the thyristor, and realizes the balance between light modulation precision and the stability of the circuit system.

The utility model relates to the technical field of cables, discloses a stretchable halogen-free low-smoke cable, and solves the problem of poor stretchability of a halogen-free low-smoke cable. The safety of the cable is improved by arranging the insulating layer on the outer surface of the conductor, the physical durability of the cable is enhanced due to the high-elasticity layer on the outer surface of the insulating layer, and the electrical stability of the cable in a humid or underwater environment is ensured due to the waterproof layer on the outer surface of the high-elasticity layer. The waterproof layer is arranged on the outer surface of the cable, the flame-retardant layer on the outer surface of the waterproof layer further strengthens the flame-retardant characteristic of the cable, the shielding layer on the outer surface of the flame-retardant layer can effectively inhibit electromagnetic interference, and finally, the outer sheath on the outer surface of the shielding layer provides additional protection, so that the cable has the advantages of no halogen, low smoke and flame retardance. And the cable also has certain stretchability, so that the cable is prevented from being damaged in use, and the use safety of the cable is improved.

The utility model discloses a novel new energy automobile charging wire, including conductor layer, heat dissipation layer and insulating layer, the conductor layer is by the flattening of the flattening structure of the stranding of multiple annealed soft copper filaments, the heat dissipation layer is covered in the conductor layer outside, by silica gel BN composite material injection moulding, its inside is equipped with the micro -fine ventilation pipeline of through, the insulating layer is located the heat dissipation layer outside, the insulating layer includes inner shielding layer and outer protective layer. The utility model discloses scientific and reasonable structure design, through the flattening structure of conductor layer, compared with traditional circular structure increases the heat dissipation area, solves the problem that the inside of car is narrow because of the section of traditional charging wire and leads to the wiring difficulty of narrow space, the problem of heavy weight, through the inner shielding layer of insulating layer adopts aluminium foil mella composite layer, inhibits the electromagnetic interference of charging wire work, solves the electromagnetic compatibility problem of high -power charging wire.

The invention relates to the field of position sensors, in particular to a linear position sensor. The device comprises a shell and a support connected to the shell. The middle of the support is provided with a PCB, the bottom is provided with a magnet and a chip, and the top is provided with a metal terminal. The middle of the magnet is hollowed out, and a groove is formed in one side of the magnet for mounting the sensing unit of the chip; the chip is connected with one end of the PCB; and the metal terminal is connected with the other end of the PCB. Through collaborative innovation of a magnetic circuit, a circuit and a mechanical structure, comprehensive performance improvement of high precision, high reliability, strong anti-interference capability and wide environment adaptability is realized.

The utility model discloses a printed circuit board and an electronic product, and relates to the field of printed circuit boards, the printed circuit board comprises a first daughter board, the first daughter board is provided with a shielding hole and a signal hole which are coaxially distributed, the diameter of the signal hole is smaller than that of the shielding hole, so that an annular gap is formed between the shielding hole and the signal hole, and the first daughter board is provided with a second daughter board; a shielding filling layer and a first electroplated layer in contact with the shielding filling layer are arranged in the annular gap; the sintering layers are arranged on the upper end face and the lower end face of the first daughter board and used for achieving interconnection with the adjacent daughter boards. The double functions of electromagnetic shielding and signal transmission are achieved, the interconnection efficiency of the multilayer circuit board is effectively improved, the production cycle is shortened, the time and cost in a traditional layer-by-layer stacking process are effectively reduced, and the yield and production efficiency of products are improved.

The present invention discloses a high-reliability printed circuit board suitable for intelligent wearable devices, comprising a first power layer board (1), a signal layer board (2), a first ground layer board (3), a power layer board (4), a second ground layer board (5), an electromagnetic shielding layer board (6), an impedance layer board (7), and a third ground layer board (8) stacked in sequence from top to bottom. The present invention greatly increases the number of sensors of the intelligent wearable device electronic product by placing components on a single side of 8 layers, and at the same time reasonably arranges the sensor components of each layer board, arranges the signal line and the ground line adjacently at different levels, thereby greatly reducing electromagnetic interference, improving the accuracy, reliability and stability of the electronic signal, and making it more flexible to be applied to the intelligent wearable device electronic product.

The utility model discloses a chassis paster SiC magnetic coding integrated circuit board, which belongs to the technical field of controller circuit boards, and comprises a TOP surface, a ground layer and a BOTT0M surface which are connected in sequence, and further comprises a three-phase terminal, a paster IGBT, an isolation type grid driving chip, an MCU and a PWM control chip which are arranged on the TOP surface, and a magnetic encoder chip arranged on the BOTT0M surface, the patch IGBT is connected with the three-phase terminal and is used for controlling the output of the three-phase terminal; the input end of the PWM control chip is connected with the output end of the MCU, the output end of the PWM control chip is connected with the input end of the isolated gate driving chip, and the PWM control chip is used for generating a pulse modulation signal and sending the pulse modulation signal to the isolated gate driving chip; the output end of the isolated gate driving chip is connected with the patch IGBT and is used for controlling the patch IGBT to be switched on and off; the magnetic encoder chip is arranged at a position opposite to the axis of an external motor connected with the circuit board; according to the utility model, the accuracy and the real-time performance can be improved.

The invention provides an EMC filter circuit and electronic equipment, and the circuit comprises a DC input interface which receives an external DC input power supply; the anti-surge unit is used for limiting the surge voltage within a safe range; the anti-reverse connection unit is used for disconnecting a transmission path of the direct-current input power supply when the direct-current input power supply is reversely connected; and the filtering unit is used for filtering the output signal of the anti-reverse connection unit to obtain a direct-current output power supply so as to suppress electromagnetic interference. Electromagnetic interference can be effectively suppressed, and the reliability and the stability of the electronic equipment are improved; wherein the anti-surge unit can protect the electronic equipment from being impacted by surge voltage, so that the safety of the equipment is improved; the anti-reverse connection unit can prevent the electronic equipment from being damaged due to reverse connection of the polarity of the power supply, the usability of the equipment is improved, and meanwhile, the overall efficiency of the power supply is improved by utilizing low on-resistance of a field-effect tube; the filtering unit can filter clutters and interference signals in the power supply, pure direct-current power supply is provided for the electronic equipment, and the performance of the equipment is improved.

This utility model relates to the field of rectifier and filter circuits, and more particularly to an AC input rectifier and filter circuit, including a rectifier bridge, a transformer, an anti-interference module, and an overvoltage protection module. A second safety Y capacitor CY2 and a third safety Y capacitor CY3 are connected in series. The third safety Y capacitor CY3 is connected to the N terminal of the mains power supply, and the second safety Y capacitor CY2 is connected to the L terminal of the mains power supply. The overvoltage protection module includes a varistor MOV1. The positive input terminal of a common-mode inductor L1 is connected to the L terminal of the mains power supply. The positive and negative output terminals of the common-mode inductor L1 are connected to the input terminals of the rectifier bridge, respectively. The positive output terminal of the rectifier bridge is connected to the positive terminal of a storage capacitor C3, and the negative output terminal of the rectifier bridge is connected to the negative terminal of the storage capacitor C3. The positive terminal of the storage capacitor C3 is connected to the transformer, and the transformer outputs 12V. This circuit enhances the anti-interference capability of the circuit by optimizing the design of the rectifier and filter circuit; at the same time, the introduction of overvoltage protection components such as a varistor improves the overvoltage protection capability of the circuit.

The invention discloses a transformer rectifier electromagnetic compatibility improved structure which comprises an input line, a transformer and a rectifier bridge, a common mode inductor and a filter capacitor assembly are sequentially connected between the input line and the transformer, and the output end of the rectifier bridge is connected with a machine shell capacitor. According to the invention, electromagnetic interference in the circuit can be suppressed, the capacity of a filter capacitor between input lines which is originally used for always interfering can be reduced, the volume required by the transformer rectifier is greatly reduced, the cost is low, the economical efficiency of the transformer rectifier can be further improved, and the problems of high cost and high cost during electromagnetic compatibility of the transformer rectifier are effectively solved.

The application discloses a double-crane synchronous control device structure integrated with a laser communication module, which comprises a master control device arranged on a first crane, a slave control device arranged on a second crane, a control cabinet, a laser communication module, a process motion control PLC fixedly installed on a mounting bottom plate, a servo driver group and an integrated mounting bracket fixedly installed on the mounting bottom plate, and a heat dissipation structure arranged on the side wall of the control cabinet; the slave control device is symmetrical to the master control device structure. The application realizes quick installation of the laser communication module through a sliding clamping groove and an elastic lock buckle, realizes electromagnetic shielding through a metal partition plate, realizes partition heat dissipation through a heat dissipation fan and heat dissipation fins, and realizes vibration isolation through a damping base. The application has the advantages of high integration, convenient installation and maintenance, strong anti-electromagnetic interference capability, good heat dissipation performance and good anti-vibration performance.

This utility model discloses a multi-joint motor drive module for a bionic robot, comprising a bionic robot body, five drive units, and a main control chip. The bionic robot body has at least one waist joint and four leg joints, each equipped with a motor. The five drive units are respectively connected to the motors at the waist joint and the four leg joints. Each drive unit has a control signal interface and a power output interface. The main control chip is disposed within the bionic robot body and is used to output multiple control signals to coordinate the movement of the motors at each joint. The control signal interface is electrically connected to the control pins of the main control chip and is used to receive forward rotation, reverse rotation, stop, and braking commands. The power output interface is electrically connected to the motors at the corresponding joints to drive the motors. This utility model aims to achieve flexible joint movement and posture adjustment in bionic robots.

The utility model discloses a high -voltage connector convenient to installation, including socket assembly and plug assembly, socket assembly is connected with plug assembly. The utility model has the beneficial effects: the utility model can realize multi -angle installation through rotating plug assembly, breaks through the restriction of traditional connector only 90 or 180 cooperation mode, and the selection range of installation position is greatly expanded, and whole car wiring becomes more convenient, the utility model adopts 360 shielding structure of shielding spring, shielding outer ring and shielding inner ring, effectively avoids the problem of shielding layer loosening, fracture, and electromagnetic interference is effectively inhibited, and the stability of system signal transmission is improved, the utility model discloses through interlocking sealing washer, socket sealing pad, plug sealing washer, small O -ring, sleeve and big O -ring etc.

The application discloses an aviation piston engine redundant ignition system with an electromagnetic shielding function and an ignition method, and particularly relates to the field of engines. The system comprises a first control module and a second control module, two control modules are connected with two ignition coils through high-voltage damping lines, each ignition coil is connected with a spark plug mechanism through a high-voltage damping line, two spark plug mechanisms are arranged on a cylinder of the engine, the high-voltage damping line is coated with a shielding layer, and the spark plug mechanism is correspondingly sleeved with a shielding shell. Based on the system, redundant ignition control is adopted, two control modules are used, each control module can control two independent ignition systems at the same time, electric energy is released to two ignition coils at the same time, ignition control is performed, and electromagnetic interference can be effectively inhibited.

The invention relates to a voltage output voltage-stabilizing device of an intelligent sensor. The voltage output voltage-stabilizing device comprises a power supply module which is used for providing a stable power supply for the whole device and realizing over-current protection, EMI protection and reverse connection prevention protection of the power supply; the accelerometer and microcontroller module comprises an accelerometer and a microcontroller which communicate with each other, and is used for realizing acceleration signal acquisition and data processing, operational amplifier power supply control and voltage output control; the DAC output voltage stabilizing circuit module comprises an operational amplifier connected with the microcontroller and is used for outputting voltage signals and performing EMI protection, reverse connection protection and overcurrent protection; the output self-checking module is respectively connected with the DAC output voltage stabilizing circuit module and the microcontroller and is used for sampling an output voltage signal; and the operational amplifier power supply control module is respectively connected with the DAC output voltage stabilizing circuit module and the microcontroller and is used for controlling a power switch of the DAC output voltage stabilizing circuit module. Compared with the prior art, the system has the advantages of high stability, strong anti-interference capability, low noise and the like.

The application relates to a flexible charging module control method and device supporting V2G, comprising the following steps: determining whether there is a hard switching risk according to the comparison result of the load power value and the preset threshold value; in the case that there is a hard switching risk, adjusting the resonant frequency of the CLLL topology to the first frequency interval based on a frequency-duty cycle hybrid modulation strategy, making the resonant current phase and the switch tube voltage phase form a preset phase difference, and adjusting the drive signal duty cycle of the primary side switch tube and the secondary side switch tube, so that the conduction time difference of the primary side switch tube and the secondary side switch tube increases with the decrease of the load power value; based on an adaptive frequency spectrum expansion algorithm, the resonant frequency is periodically dithered in the first frequency interval with a preset step, and the dithering period and the switching period of the switch tube are in a nonlinear mapping relationship; the bidirectional power conversion efficiency is improved, the light load hard switching and electromagnetic interference problems are solved, and the reliable operation of the charging module in the V2G scene is ensured.

The utility model discloses a common mode inductor integrated signal distribution wire harness for a security and protection system, which comprises a signal distribution wire harness which is at least provided with a group of wire harness mounting structures. According to the utility model, the wiring harness mounting structure is mounted on the wiring harness, so that the wiring harness connected to the security equipment can be fixed, the influence of loosening and falling on the connection of the security equipment is avoided, and the wiring harness can be fixed through movement by arranging the arc-shaped clamping plates which are symmetrical up and down; the arc-shaped clamping plates can move only by rotating the rotary knobs through a tool, compared with a comparison file in the background technology, the arc-shaped clamping plates are more stable, not prone to loosening and falling off and better in practical effect, the shielding layer and the common mode inductor module are used for restraining external electromagnetic interference, and the shielding layer is made of a metal woven mesh material. High-frequency electromagnetic interference can be effectively shielded, and the stability and anti-interference capability of signal transmission are improved.

The application belongs to the technical field of pipeline ultrasonic guided wave detection, and proposes a twist mode adjustable in-pipe electromagnetic ultrasonic guided wave transducer and a working method thereof. The application comprises multiple circumferential magnet arrays arranged along the axial direction. The circumferential magnet array comprises multiple main magnets and multiple auxiliary magnets staggered along the circumferential direction. The magnetization direction of the main magnet and the magnetization direction of the auxiliary magnet are alternately orthogonal in the circumferential plane. By embedding the circumferential magnetization auxiliary magnet between the radial magnetization main magnet, the radial bias magnetic field strength of the pipe wall area is significantly enhanced, and the electromagnetic interference of the back area of the transducer is effectively suppressed. Without increasing the volume of the magnet, the electromagnetic ultrasonic conversion efficiency and the excitation amplitude of the pipeline twist guided wave are improved. By adjusting the current excitation direction of the spiral coil at different positions to change the axial distribution period of the Lorentz force at the pipe wall, the selective excitation and flexible regulation of the pipeline twist mode can be realized without changing the geometric structure of the transducer.

This invention relates to the field of switching power supply technology, specifically providing an isolated power supply circuit aimed at solving the problems of low integration, poor output consistency, and high cost and energy consumption in existing multi-channel isolated power supplies. To this end, the invention comprises: a power control and drive module, an isolation module, a rectification, filtering, and voltage regulation module, an anti-interference module, and a load module. The power control and drive module receives power, generates a drive voltage signal, and outputs the drive voltage signal to the isolation module, while simultaneously outputting a ground potential voltage signal to the anti-interference module. The isolation module achieves voltage signal isolation output through internal electromagnetic coupling, outputting the isolated voltage signal to the rectification and filtering module. The anti-interference module outputs the filtered, interference-free ground potential voltage signal to the rectification and filtering module. The rectification and filtering module performs rectification and filtering processes, outputting a stable voltage signal to the load module. This invention features high integration and high output consistency.

The utility model relates to an anti-pad structure for optimizing a PCB high-speed via hole, which comprises a via hole pile, the via hole pile penetrates through a multi-layer PCB, and two ends of the via hole pile are respectively connected with differential signal pair wires; the combined elliptical anti-bonding pads are distributed at the wire inlet and the wire outlet of the via hole pile and are composed of a large elliptical bonding pad and a small elliptical bonding pad which are tangent, the long axis length of the large ellipse is D1, the short axis length of the large ellipse is d1, the long axis length of the small ellipse is D2, and the short axis length of the small ellipse is d2; the single circle anti-bonding pad is arranged in the copper column area of the via hole pile, the diameter of the single circle anti-bonding pad is d3, and d3 is larger than the diameter d0 of the via hole and smaller than d1. According to the anti-bonding pad structure for optimizing the PCB high-speed via hole, the combined elliptical anti-bonding pad realizes impedance gradual change from differential routing to a copper column area by means of a specific size proportion, and signal reflection at the two ends of a via hole pile is reduced; a single circle anti-bonding pad optimizes impedance in a copper column area and is matched with a U-shaped shunting groove to shield electromagnetic interference, and meanwhile, a diversion groove is communicated with the U-shaped shunting groove to form a three-stage backflow path, so that crosstalk is reduced.

The application discloses a kind of high-voltage motor fault prediction method and system, to solve the problem that prior art cannot carry out high sensitivity early warning to weak, progressive early fault under the premise of not relying on fault sample.The method comprises: synchronously collecting three-phase current, three-axis vibration and stator temperature signal;Based on historical normal data, train multivariate LSTM-VAE prediction model;Real-time calculation multidimensional residual vector;Residual covariance matrix is calculated in sliding window;Generate anomaly score by structural similarity with reference covariance matrix;When anomaly score is continuously over threshold, trigger early warning.The system comprises multi-source sensor array, synchronous acquisition module, prediction model, residual calculation module, covariance analysis module and early warning decision module.The application realizes early fault high robustness early warning when signal amplitude is not over limit by monitoring multivariate residual covariance structure evolution, significantly improves predictive maintenance efficiency.