651 results about "Current pulse" patented technology

The invention discloses a wiring harness dynamic load and electromagnetic interference coupling test method, and relates to the technical field of wiring harness testing, and the method comprises the steps: S1, defining a plurality of environment parameter groups, and constructing a test platform; s2, dynamic current pulse and multi-axis vibration excitation are synchronously loaded; s3, applying broadband electromagnetic interference signals and monitoring signal crosstalk amplitude and bit error rate changes; s4, the sensor nodes are dynamically configured according to the topological structure of the wire harness; s5, generating a feature vector; s6, outputting a wire harness performance index; s7, outputting a wire harness fault probability prediction value; s8, obtaining prediction data; s9, triggering a high-speed data recording mode, and storing original sensor data 60 seconds before the fault; and dynamically adjusting the gradient step length and the loading sequence in the environment parameter group. Performance evaluation, fault prediction and service life management can be carried out on the wire harness under complex working conditions, and the reliability and safety of an automobile electrical system are improved.

The invention provides a multi-parameter MIMO (Multiple Input Multiple Output) aviation time-frequency detection system and method, which can be applied to the technical field of underground medium detection. The system comprises a flying platform, a transmitting subsystem, a receiving subsystem and a measurement and control subsystem, and the transmitting subsystem is configured to load a first current pulse into a transmitting coil through a first current transmitter to achieve primary electromagnetic field excitation and load a second current pulse into a compensation coil through a second current transmitter to achieve secondary electromagnetic field excitation. Compensation electromagnetic field excitation is realized; the receiving subsystem is configured to be used for sampling the first current pulse and the second current pulse and collecting secondary electromagnetic field response to obtain underground medium electrical information of the target detection area; and the measurement and control subsystem is configured to send a control instruction to the transmitting subsystem and the receiving subsystem according to a sampling result and set detection parameters and monitor the working state of the detection system, and the measurement and control subsystem adjusts the first current pulse and the second current pulse in real time.

The invention belongs to the technical field of fault positioning, and particularly relates to a power cable fault positioning method and system, and the method comprises the steps: obtaining real-time cable current pulse waveform data, fault current pulse waveform data and historical cable operation data; through Haar wavelet and Symlets wavelet analysis, gathering the signal mutation points into a signal mutation point feature set; constructing a threshold intelligent optimization model, and calculating to obtain a current pulse wave head time difference; wave head time is identified by using an RNN-CNN architecture, and a unit distance wave head time transformation value of the whole cable is obtained through fitting; and calculating and correcting a fault distance, and combining the corrected fault distance with the position information of the initial end of the cable, thereby determining the position of a fault point. According to the invention, through deep combination of multi-stage wavelet analysis, the threshold intelligent optimization model and the RNN-CNN architecture, rapid and accurate positioning of the power cable fault is realized, and the fault diagnosis efficiency and accuracy are significantly improved.

The invention discloses a high-voltage cable operation state on-line monitoring, intelligent early warning and fault positioning system, particularly relates to the technical field of power equipment insulation monitoring, and is used for solving the problems that transient discharge signals generated in the cable insulation degradation process are difficult to effectively capture and accurate fault positioning cannot be realized in the prior art. The method comprises the following steps: collecting transient leakage current signals and traveling wave propagation characteristic parameters, performing phase correlation analysis on leakage current pulses and power frequency voltage to identify discharge types, and performing variational mode decomposition and Hilbert-Huang transform on the signals to respectively extract complexity characteristics and energy distribution characteristics; signal logic conflicts are judged by analyzing similarity and statistical distance among characteristics of a plurality of monitoring points, and collaborative diagnosis is started or traveling wave distance measurement is directly utilized to carry out insulation state evaluation and fault location. And finally, differential early warning levels are generated according to the diagnosis result, and fault line selection and positioning information is output to realize real-time monitoring, intelligent early warning and accurate positioning of the operation state of the high-voltage cable.

A power converting apparatus includes a rectifier unit that rectifies first alternating-current power supplied from a commercial power supply, a capacitor connected to an output end of the rectifier unit, an inverter connected across the capacitor to generate second alternating-current power and output the second alternating-current power to a motor, and a control unit that controls an operation of the inverter and an operation of the motor using a dq-rotational coordinate system rotating in synchronization with a rotor position of the motor. The control unit extracts multiple frequency components from a q-axis current pulsation, which is a pulsatile component of a q-axis current, and limits the amplitude value of each of the extracted frequency components to control the amplitude of the q-axis current pulsation.

The invention provides a power semiconductor junction temperature calibration device suitable for inverter power topology and an online junction temperature measurement system. The calibration device comprises an inverter power topology structure, a first inductor, a pulse generation device, an on-state voltage acquisition module, a current acquisition module and a thermostat. The inverter power topological structure comprises a power device for calibration and an auxiliary power device, the first inductor is used for generating on-state current of the power device for calibration, the pulse generation device is used for controlling on-off of the power device for calibration, and the on-state voltage acquisition module is used for acquiring on-state voltage of the power device for calibration; the current acquisition module is used for acquiring the on-state current of the power device for calibration, and the constant temperature box is used for keeping the temperature of the power device for calibration at a specified value. By constructing the power topological structure which is the same as the actual working state of the inverter, the conformity degree of the junction temperature calibration result and the actual working condition is effectively improved, and the online junction temperature measurement accuracy of the power device is improved.

The invention provides an anti-radiation obtaining method and system of a strong current pulse measurement system, and belongs to the technical field of pulse power, and the method comprises the steps: analyzing the influence of each device parameter in the strong current pulse measurement system on the output characteristics of the strong current pulse measurement system, and recognizing a key device; inputting the irradiation sensitivity error distribution proportionality function of the key device into a deep convolutional neural network, and performing global collaborative optimization distribution on the irradiation sensitivity error distribution proportionality coefficient of the key device by taking the minimum comprehensive error of a strong electric pulse measurement system as a target function; and performing modular hierarchical redundancy setting on the key device by taking the consistency of the irradiation sensitivity error distribution proportionality coefficients of the actually and optimally distributed key device as a target, and performing irradiation hierarchical shielding according to the hierarchical redundancy setting of the key device. The radiation-proof requirement of the system can be met, and meanwhile, the radiation-proof setting cost and the size of the measurement system are remarkably reduced.

The invention discloses an oil-immersed transformer active defense method and system based on pulse current characteristics. The acquisition device is used for acquiring output signals of high-frequency pulse current sensors mounted at a high-voltage bushing end screen grounding position, a high-voltage bushing position and an iron core grounding position to obtain digital pulse current signals; whether active defense is started or not is judged according to whether the instantaneous value of the pulse current signal at the iron core grounding position reaches a protection starting threshold or not; judging whether the current pulse cluster is a discharge pulse cluster with abnormal internal discharge or not based on the three groups of pulse current signal characteristics; and judging whether protection acts or not according to the number of abnormal discharge pulse clusters in a set period. According to the method, serious partial discharge in the large oil-immersed transformer can be identified, protection measures are actively taken, and the situation that serious discharge defects are further developed into arc breakdown faults is effectively avoided.

The invention discloses a cable defect detection device and method. The detection device comprises a high-frequency current sensor, a signal acquisition module, an algorithm analysis module, a high-frequency pulse detection module and a fault diagnosis module, the high-frequency current sensor is used for detecting a current pulse signal on a cable grounding wire, converting the current pulse signal into a voltage signal and transmitting the voltage signal to the signal acquisition module; the signal acquisition module is used for amplifying, filtering and detecting the voltage signal; the algorithm analysis module is used for carrying out feature extraction and analysis on the processed voltage signals and carrying out feature classification and clustering on the voltage signals; the high-frequency pulse detection module is used for carrying out noise reduction processing on the voltage signal and extracting the voltage signal representing the partial discharge defect of the cable; and the fault diagnosis module is used for determining the type and degree of the cable defect according to the voltage signal representing the partial discharge defect of the cable and historical data. Cable line faults are rapidly judged, and the reliability of a power supply system is improved.

A level shifter includes: a low voltage domain configured to output non-overlapping first and second current pulses based on opposite edges of a logic input signal; and a high voltage domain comprising a latch and a current mirror circuit configured to mirror the non-overlapping first and second current pulses such that the latch is set when the first current pulse is active and reset when the second current pulse is active. The current mirror circuit includes a first mirroring path for the first current pulse and a second mirroring path for the second current pulse. The level shifter has a common mode slew current that is added to the non-overlapping first and second current pulses. The first mirroring path and the second mirroring path are cross-coupled such that the common mode slew current is reduced or cancelled before the non-overlapping first and second current pulses are input to the latch.

The present disclosure concerns a method for measuring a degradation of thermal characteristics of a power module comprising sequences of: - injecting current pulses (Pinj), having a voltage-clamped constant amplitude (IInj), between an emitter and a gate of a power semiconductor of such power module, a duration of said voltage-clamped constant amplitude (Iinj) current pulses (Pinj) being modulated periodically with a modulation frequency (Fmod), said current pulses causing losses modulated with said modulation frequency (Fmod), - measuring a parameter (k.Tj) dependent of a junction temperature (Tj) of such power semiconductor at the beginning of said current pulses, - measuring a phase shift (Δφ) between said modulation frequency (Fmod) and said parameter (k.Tj), said phase shift (Δφ) providing a health indicator for the power module.　

The invention discloses a direct current B code wave recording alarm analysis device and method based on an FPGA, and relates to the technical field of power system automation and signal analysis, and the device comprises an FPGA collection module which is used for collecting a TTL level signal of a direct current B code in real time at a preset sampling frequency, recording a high-precision timestamp of each sampling point, and carrying out the subsequent pulse parameter calculation; the pulse width measurement module is connected with the FPGA acquisition module, is used for calculating the pulse width of the current pulse based on the rising edge timestamp and the falling edge timestamp of the signal, triggering a wave recording module, and is used for starting wave recording operation when the pulse width is detected to exceed a preset threshold range or abnormity occurs for a plurality of times continuously; collecting complete waveform data before and after the fault; the DC B code wave recording alarm analysis device and method based on the FPGA improve the intelligent level, response speed and fault visualization capability of a B code monitoring system, and are especially suitable for high-reliability monitoring and management scenes of key synchronization signals in a DC system.

The present application relates to a device and method for surveying a power line-buried path, wherein the device includes a transmitter which selects a balanced / unbalanced voltage to output input and rectified output power as a current pulse in the form of an unmodulated pulse or a frequency-modulated signal when a current pulse signal is transmitted to a conductor (power line) of a public distribution network, and a receiver in which a plurality of magnetic field sensors inductively couple the pulse or the frequency-modulated signal within a near magnetic field distance to obtain a difference value in each direction to obtain a depth.

The utility model provides an energy spectrum data reading circuit and an X-ray detector. The energy spectrum data reading circuit comprises an acquisition circuit, the acquisition circuit comprises a plurality of sub-channels, and each sub-channel is used for receiving a current pulse signal generated based on X-rays and generating a detection signal based on the current pulse signal; the trigger circuit is connected with the plurality of sub-channels and is used for responding to an over-threshold channel in the plurality of sub-channels, generating a global trigger signal and a channel gating signal and outputting the address of the over-threshold channel, and the over-threshold channel is the sub-channel of which the amplitude of the generated detection signal exceeds a preset threshold value; the multiplexer is connected with the plurality of sub-channels and the trigger circuit, and is used for selecting an over-threshold channel from the plurality of sub-channels according to a channel gating signal provided by the trigger circuit to output a detection signal; and the control circuit is connected with the trigger circuit of the acquisition circuit and the multiplexer, and is used for reading the detection signal output by the multiplexer and the address output by the trigger circuit in response to the global trigger signal from the trigger circuit.

The technology disclosed relates to a pulsed power drilling system and methods for measuring properties of a mineral substrate by using at least one of the electrodes of the drill head of the pulsed power drilling system for measurement purposes. In particular, at least one of the electrodes of the drill head that is configured to be connected to a first electrical circuit for generating high voltage current pulses is also configured to be connected to a second circuit used for the purpose of measuring properties of the mineral substrate. At least one of the plurality of electrodes of the drill head that is configured to be used for passing a high voltage current pulse between two electrodes of the drill head via the mineral substrate for the purpose of breaking the mineral substrate may thereby also configured to function as a measurement electrode. The disclosed pulsed power drilling system and method may for example be applied in rock drilling, concrete processing, mineral processing, and continuous mining. The present disclosure further relates to a drill rig comprising a pulsed power drilling system and the use of a pulsed power drilling system.

The invention provides a temperature error compensation method and system for a strong current pulse measurement system, and belongs to the technical field of pulse power, and the method comprises the steps: analyzing the influence of a device on the output comprehensive error of a to-be-compensated strong current pulse measurement system according to a device temperature coefficient function and interference weight ratio recognition, and recognizing a system key device; taking the temperature coefficient function of the key device as the input, taking the goal that the root mean square of the temperature coefficient in the system operation domain reaches the minimum, and adopting a first deep convolutional neural network to carry out optimal distribution of the temperature coefficient of the key device; according to the distributed optimal temperature coefficient of the key device, adjusting the actual temperature coefficient of the key device through a second deep convolutional neural network by using a temperature sensor and a programmable device; and based on the difference value between the actual temperature coefficient of the key device and the distributed optimal temperature coefficient of the key device, compensating the output overall temperature of the measurement system. According to the invention, effective compensation of the temperature coefficient of the full-temperature operation domain of the measurement system is realized.

The invention relates to a power distribution cable line fault positioning device, and the device comprises a control unit which comprises a system host and is responsible for receiving data of each module and carrying out the comprehensive analysis and processing; the data acquisition unit provides basic data for fault positioning through a cable path instrument, measures the broadband impedance change of the cable through a broadband impedance tester, and assists in judging the fault type and position; the preliminary positioning unit is used for transmitting a high-voltage pulse signal through a pulse current generator, accurately receiving a current pulse waveform generated during discharging or breakdown through a current coupler, and preliminarily positioning a fault point; a time domain reflection measuring instrument of the accurate positioning unit accurately determines the fault position by measuring the propagation time of the high-voltage pulse signal in the cable; and the artificial intelligence processing unit performs intelligent analysis on the data by integrating machine learning and a deep learning algorithm. According to the fault positioning device and the diagnosis method, the fault of the distribution cable line can be quickly and accurately positioned, the operation is convenient, and the implementation is easy.

A method for plasma processing a substrate, where the method includes generating a plasma in a plasma chamber within which the substrate is held during processing, where generating the plasma includes: flowing a discharge gas through the plasma chamber; coupling a radio frequency (RF) source signal to a first RF electrode, where the coupling ionizes the discharge gas; and coupling a bias signal to a second RF electrode, the bias signal being a periodic series of bias pulses, each period having a bias-ON time and a bias-OFF time, where a bias voltage waveform is applied during the bias-ON time; generating a pulsed DC magnetic field in the plasma chamber, by coupling a magnetizing signal to an electromagnet, the magnetizing signal being a periodic series of current pulses; and prior to coupling the magnetizing signal, synchronizing the periodic series of current pulses with the bias signal to flow a DC magnetizing current during the bias-ON time.

The invention provides a leakage current testing method and system based on a low-frequency EIS and a transverse current pulse, and relates to the technical field of leakage current testing. The method comprises the following steps: firstly, determining use information and low-frequency EIS test parameters of a target battery to be tested, then testing the battery by using electrochemical working equipment according to the parameters, obtaining impedance data under different frequencies, and further obtaining first dynamic capacitance information. And controlling the power supply equipment to apply a preset transverse pulse current to the battery, determining a voltage variation cut-off condition, continuously monitoring the voltage variation, and recording the test time variation when the cut-off condition is reached. And finally, the leakage current value of the battery is determined by integrating the first dynamic capacitance information, the transverse current pulse current, the test time variation and the voltage variation. Compared with a traditional method, the leakage current value can be obtained only by applying the direct current once after the low-frequency EIS test without changing the magnitude and the duration time of the current for many times, the test process is simplified, the test efficiency is improved, and the leakage current value can be determined more accurately.

The invention relates to the technical field of beam measurement, and provides a beam integration device, which comprises a logic control module and a plurality of integration modules, each integration module is used for being correspondingly connected with one output channel of a dose distribution detector, and each integration module comprises a current gear selection circuit, an integration circuit and a polarity discrimination circuit, the current gear selection circuit comprises a plurality of current gear channels; the current gear selection circuit is used for selecting a target current gear channel to be connected with an output channel corresponding to the dose distribution detector under the control of the logic control module, and converting a current pulse signal output by the output channel corresponding to the dose distribution detector into a voltage signal; the polarity discrimination circuit discriminates the polarity of the voltage signal and converts the voltage signal into the polarity required by the integrating circuit. According to the beam current integration device, simultaneous integration of multi-channel bipolar current pulse signals is realized, and the integration range is automatically switched according to the change of the current pulse signals.

The invention relates to the technical field of capacitor charging and discharging control, in particular to a super-capacitor charging and discharging control method and system, and the method comprises the steps: transmitting a preset low-current pulse test signal to a super-capacitor, and recognizing the characteristics of the capacitor; according to the capacitance characteristics, selecting a target charging path from the preset charging paths for staged charging; a charging stage verification model is set for charging stage verification, and whether a charging stage switching condition is met or not is judged by combining real-time monitoring of the internal resistance change rate and the voltage climb rate; a parallel state monitor is designed, and the optimal control parameters of the next charging stage are calculated in parallel based on the target charging path while the control of the current charging stage is executed; when the charging stage switching condition is met, the optimal control parameters are loaded immediately for charging stage switching; monitoring the state of the capacitor in the charging process in real time, and returning to the previous stable charging stage and re-identifying the characteristics of the capacitor when an abnormal state is detected; and when the retry times exceed a preset upper limit, switching to a safety protection mode.

The invention discloses an energy-saving control method for a new-energy high-low-voltage direct-current relay. The energy-saving control method comprises the steps of analyzing a mapping relation between a silicon steel sheet stacking angle and a magnetic flux path deviation, calculating magnetic domain wall moving resistance according to magnetic domain boundary stress, determining a magnetic domain overturning speed by combining a magnetic field change rate, and measuring a hysteresis loop width parameter. Adjusting the width and frequency of the excitation current pulse according to the magnetic domain overturning frequency and the hysteresis loop offset and width to obtain an optimized excitation current pulse sequence, and determining the hysteresis loop expansion speed according to the hysteresis loop area change rate; the local high-temperature area temperature is analyzed through the iron core temperature rise rate, the local high-temperature area distribution and the magnetic domain energy dissipation data, if the local high-temperature area temperature exceeds the preset threshold value, the excitation current pulse is adjusted, stable iron core temperature rise control data is obtained, the coercive force change amplitude is determined, the magnetic hysteresis loss and the temperature rise are reduced, the stability of the relay under high-frequency switching is improved, and the reliability of the relay is improved. And the operation efficiency and reliability of the system are greatly improved.

The invention provides a diesel-storage hybrid power anti-overload system and device based on a network-forming inverter, and a medium. A pre-synchronization module realizes seamless switching between a VSG mode and a PQ mode based on dynamic voltage amplitude matching, phase-locked loop frequency synchronization and phase real-time alignment technologies; the hardware current limiting module adopts high-speed current monitoring and hardware-level protection logic to cut off an overcurrent pulse in real time and prevent a power device from failing due to transient impact; the power suppression module optimizes the power distribution of the diesel generator and the energy storage by judging an overload threshold value and a steady state recovery condition in real time; the logic judgment module coordinates the diesel generator dynamic frequency modulation and energy storage mode switching, the diesel generator preferentially bears the transient power difference when the load suddenly changes, and the energy storage mode is seamlessly switched to the network construction mode after the system recovers the steady state; according to the system, through software and hardware full-link collaborative design, the problems of transient overload and mode switching instability of the diesel storage system are solved, and the stability and energy efficiency of the diesel storage hybrid power system are improved.

The invention provides an aviation transient electromagnetic constant-amplitude in-phase parallel transmitter system, and the system comprises a power management unit which is used for supplying power; the full-bridge inverter circuit unit comprises a plurality of MOSFET full-bridge inverter modules which are arranged in parallel, each MOSFET full-bridge inverter module sends out a constant-amplitude in-phase bipolar parallel current pulse to a transmitting load connected with the MOSFET full-bridge inverter module, so that each transmitting load generates a constant-amplitude in-phase electromagnetic field, and the constant-amplitude in-phase electromagnetic fields are superposed and jointly act on a to-be-detected target; the active self-adaptive voltage-adjustable double-clamping unit is connected with the full-bridge inverter circuit unit and is used for clamping the rising edge and the falling edge of each sub-pulse in the equal-amplitude in-phase bipolar parallel current pulse; the control unit is used for generating a PWM (Pulse Width Modulation) sequential logic control signal to control the full-bridge inverter circuit unit, so that each MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) full-bridge inverter module outputs a constant-amplitude in-phase bipolar parallel current pulse; and the detection unit is used for detecting the emission current, the clamping current and the clamping voltage respectively and feeding back detection results to the control unit.

The invention discloses a current pulse generator noise reduction method and device, and relates to the technical field of current pulse generator noise reduction, and the method specifically comprises the following steps: removing a main pulse waveform from a filter response sequence, extracting filter residual response segments of a plurality of periods, carrying out the time alignment and overlapping processing of the residual response segments of the plurality of periods, and carrying out the noise reduction of the current pulse generator. Constructing a residual energy superposition trend line; based on the residual energy superposition trend line, a Savitzky-Golay sliding window polynomial fitting derivative algorithm is adopted to calculate a trend offset rate parameter, and a wavelet packet decomposition and Shannon entropy calculation algorithm is adopted to generate a disturbance frequency domain diffusivity parameter so as to reflect whether the residual energy superposition behavior of the filter is evolved into self-excitation background noise. According to the method, the problem that residual energy superposition of the filter is difficult to recognize under continuous narrow pulses is solved, precise recognition and dynamic intervention control of self-excitation background noise are realized, and the system stability is improved.

The invention relates to an electrochemical impedance spectroscopy on-line measurement method and device, electronic equipment and a storage medium, and the electrochemical impedance spectroscopy on-line measurement method can collect time domain signals of a lithium battery under the excitation of a large-current pulse, such as voltage signals and current signals of the lithium battery in a large-current pulse charging state. During large-current pulse charging, a to-be-measured curve based on a time domain signal is converted into frequency domain information with the deviation of an electrochemical station reference curve smaller than a preset deviation through wavelet transform, impedance information is determined according to parameter information of a wavelet basis function in the conversion process, and an electrochemical impedance spectrum of the lithium battery is determined according to all the impedance information. Due to the fact that time-frequency analysis of the lithium battery under large-current pulse excitation can be completed, large-current pulse charging is achieved, and meanwhile online electrochemical impedance spectroscopy measurement is conducted on the lithium battery.

The invention relates to the technical field of power equipment detection, and particularly discloses a cable partial discharge detection method and system under high noise, and the method comprises the steps: dividing a cable into a plurality of monitoring regions, employing a current sensor to collect a current pulse signal of each region in real time, and enabling the current pulse signal to comprise the current pulse frequency and repetition rate; current pulse frequency fluctuation characteristics and current pulse repetition rate characteristics are extracted, and corresponding characteristic indexes are generated; then, by comprehensively analyzing the characteristic index of each region, calculating a comprehensive index and comparing the comprehensive index with a preset threshold value, whether the partial discharge phenomenon exists in the region or not is judged; further analyzing the deviation between the real-time discharge frequency and the historical normal discharge data of the region which is judged to be partial discharge, performing anomaly detection by using an isolated forest model, and judging whether the discharge is abnormal or not; when abnormal discharge is detected, the system automatically starts an early warning and regulation and control mechanism to carry out voltage regulation or temperature control so as to avoid equipment damage or faults.

The invention discloses an array type electromagnetic detection emission synthesis excitation system and method, and the system comprises an emission coil module which is formed by arranging a plurality of emission coils at certain intervals into a square, a circle or other structures; the emission control module is used for dynamically adjusting parameters of emission current according to detection requirements and environmental conditions and controlling the working state of the emission coil module; the time reference synchronization module is used for receiving time and position signals provided by a satellite, calibrating a clock and a position through a satellite positioning signal, and realizing synchronous emission of a plurality of coils; the time reference synchronization module sends satellite time and position signals to the emission control module; the emission control module generates an emission instruction according to a time reference and sends the emission instruction to each emission coil module; and each transmitting coil module simultaneously transmits a current pulse according to the received transmitting instruction to generate a stable electromagnetic field. Flexible arrangement modes such as unmanned aerial vehicle carrying or single-person carrying can be achieved.

The invention discloses a manufacturing process of a COB (Chip On Board) process circuit board for photoelectric display. The manufacturing process comprises the following steps: performing constant-amplitude direct-current driving on a light-emitting chip array before injection of packaging glue to obtain full-board light field baseline data; the refractive index distribution of the packaging adhesive is regulated and controlled through multi-phase current pulses after the packaging adhesive is injected; forming a composite structure of a high-refractive-index chip interconnection interface and a low-refractive-index packaging surface by using Joule heat in a packaging adhesive crosslinking stage; the metal surface roughness is adjusted through nanosecond cosine pulses so as to control the plasma resonance characteristic; and finally, carrying out fine adjustment on the local refractive index by utilizing the interaction of the moving ions and the polar side chain. According to the technical scheme, stable refractive index distribution can be formed in the chip packaging structure through multi-physics field coupling regulation and control, formation of sub-wavelength stray light waveguides is effectively restrained, the problems of dynamic color cast and brightness flicker in an ultra-small pixel pitch COB display device are solved, and the optical performance consistency of the device is improved.

The present invention discloses a gas overflow detection method and a diaphragm gas meter, belonging to the technical field of gas meters. The method comprises: using a first timer with a first timing step to measure the pulse time interval of the diaphragm gas meter; when the count value of the first timer corresponding to the current pulse time interval is less than or equal to the first counting threshold, using a second timer with a second timing step to measure the subsequent pulse time interval of the diaphragm gas meter; the second timing step is less than the first timing step; when the count values ​​of the second timer in the pulse time intervals of a preset number of consecutive times are all less than or equal to the second counting threshold, confirming that an overflow anomaly occurs; the first or second counting threshold is the count value corresponding to the pulse time interval corresponding to the overflow threshold when the first or second timing step is used for measurement; the preset number is less than the number of complete pulse time intervals that pass within the detection time limit when gas is leaking at the overflow threshold. The present invention can timely and accurately detect gas overflow anomalies.