800 results about "Pulse current" patented technology

The invention provides a single-tube boost PFC circuit control method and system for single-cycle control, and relates to the technical field of data processing, and the method comprises the steps: generating a self-adaptive PWM control signal according to a duty ratio adjustment amount and a frequency compensation factor, and dynamically limiting the pulse current amplitude of a power switch tube through a peak current prediction algorithm, a load current change rate is generated based on the real-time relevance between the pulse current amplitude and the load current; setting a first monitoring point in a dynamic duty ratio change path of the PWM control signal, and extracting a duty ratio change rate and a switching frequency fluctuation parameter in real time; setting a second monitoring point in a feedback path of a load current change rate, and extracting a load current slope characteristic and a transient change amplitude in real time; and based on the parameters of the first monitoring point and the second monitoring point, generating a correction factor through a dynamic response correlation model. According to the invention, a high power factor can be realized under wide input voltage and load fluctuation.

A driving method of a transcranial magnetic stimulation 3D coil device is disclosed, which includes: determining first and second signal peaks corresponding to a specified rotating magnetic field direction, in which the first and second signal peaks respectively correspond to first and second coils in multiple coils; providing a first pulse current having the first signal peak to the first coil, in which the first pulse current signal stimulates the first coil to provide a first magnetic field; providing a second pulse current signal having a second signal peak to the second coil, in which the second pulse current signal stimulates the second coil to provide a second magnetic field, in which the first magnetic field and the second magnetic field form a rotating magnetic field having the specified rotating magnetic field direction.

The invention discloses a transformer partial discharge detection method and system based on multi-modal feature combination, and relates to the technical field of transformer detection, and the key points of the technical scheme are that the method comprises the steps: collecting an electromagnetic wave signal, a pulse current signal and a sound wave signal of a target transformer; respectively extracting an electromagnetic wave time-frequency matrix, a pulse current waveform parameter and a sound wave space coordinate; performing multi-modal feature fusion on the electromagnetic wave time-frequency matrix, the pulse current waveform parameters and the sound wave space coordinates based on a dynamic weighting strategy to generate a joint feature tensor; and inputting the joint feature tensor into a pre-constructed neural network model, identifying a discharge type and optimizing a positioning coordinate. According to the method, multi-modal features are subjected to tensor fusion, cross-modal correlation learning is realized through the neural network model, information islands can be eliminated, and the misjudgment rate is effectively reduced; and electromagnetic wave-current-sound wave signal adaptive fusion is realized through a dynamic weight coefficient, and the signal-to-noise ratio is obviously improved through characteristic complementation in an oil paper insulation discharge scene.

The present invention relates to the field of defect detection technology, and in particular to an OLED screen defect detection method based on optical-magnetic multimodal fusion, comprising the following steps: S1: synchronous excitation and data acquisition based on pulsed current drive; S2: cross-modal spatial calibration and noise suppression; S3: polarization-magnetic field coupling feature extraction; S4: dynamic correlation decision-making and closed-loop feedback, including realizing defect classification determination through correlation analysis of multimodal data, and verifying the authenticity of defects through current overload testing. This method effectively solves the problems of ambient light interference, missed detection, high cost, low resolution, etc. existing in the prior art, has significant beneficial effects, can improve detection accuracy, efficiency and reliability, meet the needs of large-scale production lines, and can efficiently locate and reduce errors and redundant steps in the detection process.

The invention relates to the technical field of integrated circuit manufacturing, in particular to a precise electroplating control system and method for an electroplated layer of a double-layer circuit board, and the method comprises the steps: building a multi-physical field coupling simulation model, and simulating the internal current density and ion concentration distribution of a via hole; constructing a mapping relation between the current density and the side wall electroplating thickness based on a simulation result, and predicting the electroplating thickness; through thickness prediction feedback, a time sequence adjustable pulse current control strategy is designed, the pulse amplitude, the duty ratio and the on-off period are dynamically adjusted, and current distribution optimization is guided; the state of the electroplating process is sensed in combination with real-time monitoring and analysis of multi-source parameters of electrode potential, conductivity and fluid velocity; and based on the prediction model and the real-time parameters, adjusting the pulse waveform and the time sequence through closed-loop compensation. According to the method, the uniformity and controllability of the thickness of the electroplated layer on the side wall of the via hole can be remarkably improved.

The invention discloses a power supply rapid charging pulse current regulation and control system and method based on current monitoring, and particularly relates to the technical field of power supply management. The method comprises the following steps: acquiring a pulse current signal in a battery charging process, performing nonlinear decoupling analysis, and decomposing the pulse current signal into a first characteristic sub-vector representing a real charging state of the battery and a second characteristic sub-vector representing a high-frequency harmonic interference state; predicting the change trend of the electrochemical impedance of the battery based on the first feature sub-vector to form an instant charging acceptance evaluation index, and evaluating the harmonic interference degree based on the second feature sub-vector to form a charging state misjudgment risk level index; based on the battery instant charging acceptance assessment index and the battery charging state misjudgment risk grade index, the optimal pulse current regulation and control strategy is determined, the power output parameters are adjusted in real time, the state misjudgment problem caused by high-frequency harmonic interference and electrochemical impedance coupling is effectively solved, and the battery charging performance and the long-term reliability are improved.

The invention provides a blade lightning protection channel online test method and system based on a pulse current method, and belongs to the technical field of blade lightning protection detection.The method comprises the steps that a pulse waveform is generated through a pulse current generator to simulate lightning impulse, and the lightning impulse is injected into the surface of a lightning arrester of a blade lightning protection system; measuring channel currents at different positions of the surface of the lightning arrester in the length direction by using a distributed sensor; a high-voltage differential probe is used for collecting and measuring the waveform of an incident wave and the waveform of a reflected wave of an injection point; detecting blade surface potential distribution by using a capacitive coupling sensor; comparing the waveform of the incident wave, the waveform of the reflected wave and the theoretical waveform, determining a time domain reflection coefficient and a frequency domain impedance spectrum, and determining a fault type; after the fault type is determined, the fault point is positioned based on the channel current and the blade surface potential distribution, the lightning impulse is simulated through the pulse waveform, the lightning protection channel is further tested, shutdown is not needed, the testing efficiency of the blade lightning protection channel is effectively improved, and the power generation efficiency is ensured.

The invention discloses an insulation resistance and capacitance measuring circuit and method based on monopulse double-edge analysis, and relates to the related field of the electrical insulation online monitoring technology, and the circuit comprises a detected object and an insulation detection circuit. The insulation detection circuit comprises a controlled pulse voltage source, a coupling resistance network, a current sensor, a switch control module, a signal modulation circuit and a processor. The measurement method implemented based on the circuit comprises the following steps: injecting a common-mode voltage pulse into a transmission line of the power transmission system by adopting a pulse transmitter; pulse current response is collected in real time, a current oscillogram is drawn, and a three-point sampling method is introduced to record a current value for insulation impedance parameter calculation; according to a load condition, a double-edge verification method is applied based on a pulse current attenuation characteristic, and insulation impedance parameters including a resistive component and a capacitive component are independently calculated by analyzing a pulse current rising edge and a pulse current falling edge. According to the invention, non-intrusive synchronous monitoring of resistive and capacitive components of line-to-ground impedance is realized, and the detection precision is improved.

The present invention discloses an auxiliary pet training apparatus, where pet bark is received by a microphone, amplified through an amplification circuit, subjected to signal filtering, and transmitted to a micro-processing module; the micro-processing module receives a corresponding electrical signal, and transmits a control signal to a pulse generating device and a vibration module; a pulse module outputs a pulse current to be transmitted to a conductive sleeve via a vibration head sleeve; and a vibration motor in the vibration module is started to transmit vibration to the vibration head sleeve. The present invention provides an auxiliary pet training apparatus providing stimulation for pets using low-voltage pulse current in combination with mechanical vibration, thereby achieving training for the pets, avoiding occurrence of electric arcs to damage fur of the pets, and preventing injury to a user due to touch by mistake.

According to the cable multi-parameter fusion sensor and method, in the cable multi-parameter fusion sensor, a shielding shell is of an open-close type metal annular structure; the zero-flux sensor module is arranged on the inner layer of the shielding shell so as to detect a cable sheath ring current signal; the pulse current sensor module is arranged on the outer side of the zero-flux sensor module so as to detect a cable partial discharge pulse current signal and an overvoltage impact current signal; the magnetic shielding layer is arranged between the zero-flux sensor module and the pulse current sensor module to shield low-frequency magnetic field interference; the zero magnetic flux sensor module and the pulse current sensor module share the shielding shell to form an electromagnetic shielding structure.

The invention discloses an electro-optical-acoustic cooperative partial discharge detection device and method, and belongs to the field of equipment discharge fault detection. The device integrates a high-frequency current detection module, a photoelectric coupling detection module and an acoustic emission detection module; a high-frequency pulse current signal of a cable grounding loop, a pulse electric field of an insulating surface and an ultrasonic signal in a solid medium can be collected at the same time; all the collected signals are sent to the signal integrated processing module for alignment, noise reduction and multi-signal homologous conformity test; after detection, the signal integration processing module extracts combined feature vectors from the signals and inputs the combined feature vectors to the classification discriminator; finally, the discriminator outputs the probability of partial discharge, and if the probability exceeds a preset threshold value, it is judged that partial discharge exists in the cable. Therefore, by implementing the method and the device, the problems that single-mode detection in the prior art is poor in anti-interference capability in a complex field environment, and false alarm or missing alarm is easy to occur can be solved.

The present invention discloses a pulse generator and a pulse rod, which relate to the field of pulse circuit technology. The pulse generator includes a frequency control unit, a dual closed-loop pulse amplification unit, a digital signal processing unit and an adaptive power management unit. The frequency control unit includes an environmental sensor and a microcontroller. The microcontroller can calculate a preset pulse frequency based on information transmitted by the environmental sensor. The input end of the dual closed-loop pulse amplification unit can receive a pulse signal transmitted by the microcontroller, amplify it to a preset pulse frequency, and provide a pulse current to an electrostatic elimination needle. The digital signal processing unit can digitize the pulse signal to enhance the anti-interference ability of the pulse signal. The adaptive power management unit includes a dynamic voltage regulation module electrically connected to an external power supply, and the dynamic voltage regulation module can dynamically adjust the output voltage. The technical solution provided by the present invention can provide a pulse generator with high stability, a wide adjustment range and strong anti-interference ability.

The invention discloses a cable operation environment optimization method based on cable trench collection information, and relates to the technical field of intelligent operation and maintenance of a power system, and the method comprises the steps: collecting an original parameter data set in a cable trench; a pulse current signal is collected at a cable grounding wire connection point, and a standard pulse discharge capacity sequence is generated through band-pass filtering and amplitude integral conversion; based on the original relative humidity measurement value and the environment temperature value, calculating a compensated relative humidity value through a multi-scale heat conduction-diffusion coupling equation; calculating a cable insulation risk index through a quantum annealing algorithm by using the compensated relative humidity value and the standard pulse discharge capacity sequence; the dynamic measurement deviation of the temperature and humidity sensor is subjected to double compensation of thermal radiation and molecular adsorption by constructing a multi-scale heat conduction-diffusion coupling equation, so that the reliability of environmental state sensing is greatly improved, and the operation safety, stability and intelligent operation and maintenance level of a power cable system are effectively enhanced.

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 relates to the technical field of intelligent control, and discloses an ultra-low power consumption miniature LED visible light intensity self-adaptive regulation and control method and system, and the method comprises the steps: obtaining an analog light intensity signal, and carrying out the smoothing processing of the analog light intensity signal, and obtaining an environment light intensity value; calculating a light intensity change rate, and if the light intensity change rate exceeds a dynamic threshold value, marking an environment state and outputting a light intensity difference value; generating a preliminary adjustment instruction according to the state matching control parameter and the difference value quantization mapping, and calculating target light intensity in combination with the basic brightness; after executing the instruction, calculating actual and target deviation, and iteratively correcting to obtain a light intensity control signal; if the power consumption exceeds the limit, optimizing the signal amplitude; the input driving circuit analyzes the synthesized pulse current, excites pixels to emit light and gathers to obtain adjustment data; and if the visual contrast is lower than a threshold value, the change rate is adjusted again to realize closed-loop refining, and the light intensity adjustment accuracy is improved. The method can improve the real-time sensing capability of ambient light.

The invention is suitable for the technical field of grounding grid defect evaluation, and provides a transient electromagnetism-based grounding grid corrosion defect evaluation method and system, and the method comprises the steps: placing a sensor of a transient electromagnetic detection device above a to-be-detected region of a grounding grid, injecting a pulse current excitation signal into a conical focusing excitation coil, and carrying out the detection of the to-be-detected region of the grounding grid; acquiring an induced voltage time sequence signal through a receiving coil; extracting at least one characteristic parameter from the induced voltage time sequence signal, wherein the characteristic parameter comprises a signal peak value, peak value time, an attenuation rate or a signal integral quantity; inputting the characteristic parameters into a preset corrosion evaluation model, and performing inversion to obtain a residual thickness value or a corrosion depth value of the grounding grid in the to-be-detected area; generating and outputting a quantitative evaluation result containing the residual thickness value or the corrosion depth value; the method can be implemented in a non-stop state of the grounding grid, and an efficient and reliable decision basis is provided for safe operation and state maintenance of a power system.

The invention provides a wind power tower drum defect detection surface wave sensor and a detection method thereof. The sensor comprises a shell, a magnetic attraction part and a transmitting and receiving integrated signal part. The magnetic attraction component adopts a U-shaped structure and is formed by connecting two ends of a strip-shaped magnet with a magnetizer respectively; and the receiving and transmitting integrated signal component is positioned at the opening end of the U-shaped structure of the magnetic component. The sensor is adsorbed on the surface of the outer wall of a tower drum, meanwhile, a near surface layer of the outer wall of the tower drum presents a strong bias magnetic field, radio frequency pulse current is introduced into a transmitting and receiving integrated signal component, a high-frequency dynamic magnetic field is induced on the near surface, surface waves in any direction are excited and received under the action of the two fields, and echo signals of the surface waves are analyzed. And judging whether the outer wall of the tower drum has defects. The sensor disclosed by the invention is small in size and capable of meeting mobile scanning, the propagation distance of the excited surface wave is long, the recognition precision is high, the working difficulty of tower drum defect detection is reduced, circumferential and axial defect detection is realized, and the detection efficiency is improved.

The invention belongs to the technical field of equipment state monitoring and fault diagnosis, and relates to a pole-mounted switch damp defect diagnosis method and system based on multi-source information fusion, and the method comprises the steps: collecting a leakage current signal and a high-frequency pulse current signal flowing through a grounding wire in real time, and environment parameters around a target pole-mounted switch; preprocessing the leakage current signal and the high-frequency pulse current signal, and performing feature extraction based on the preprocessed leakage current signal, the preprocessed high-frequency pulse current signal and environmental parameters to obtain a leakage current feature quantity, a high-frequency discharge feature quantity and an environmental coupling factor; and based on the leakage current characteristic quantity, the high-frequency discharge characteristic quantity and the environment coupling factor, judging a damp fault of the target pole-mounted switch, and combining a D-S evidence theory and fusing multi-source information confidence to complete damp defect diagnosis of the target pole-mounted switch. According to the invention, complementarity between different information sources can be fully utilized, and the damp state of the pole-mounted switch can be accurately judged.

The invention discloses a light-sensing external trigger signal output device for laser far-field parameter analysis, comprising: a light signal detector, used for collecting laser signals irradiated on a target plate and outputting a pulse current signal; a signal primary amplification module, used for converting the pulse current signal into a pulse voltage signal and amplifying the pulse voltage signal; a signal superposition amplification module, used for amplifying the pulse voltage amplification signal output by the signal primary amplification module again; a laser pulse signal judgment module, comprising a comparator, used for setting a signal judgment threshold value, the comparator being connected to a monostable trigger, and the monostable trigger sending a trigger signal when the pulse signal is greater than the signal judgment threshold value set by the comparator; an MCU main control module, used for interrupt processing, trigger signal delay and output frequency setting, trigger signal output and transmitting a timing control signal to an imaging camera; a power management module, connected to an external power supply and supplying power to the remaining modules.

The invention discloses a self-adaptive cable grounding resistance detector and a self-checking method, the self-adaptive cable grounding resistance detector comprises a shell, the shell is provided with an indicating lamp, a charging socket, a power switch and a single-ended grounding and cross-connected wiring socket, the shell is internally provided with a main control unit, and the algorithm of the main control unit has functions of function calibration, compensation calibration, power supply self-checking and the like. The main control unit is integrated on a circuit board, and can adapt to various grounding detections without replacing hardware by controlling automatic switching of a relay, so that the universality and the economical efficiency are improved. The device is controlled by an integrated circuit chip, has high precision and high environmental adaptability, and is suitable for single-end grounding and cross interconnection grounding resistance detection of a high-voltage cable. According to the invention, the self-checking process is completed before starting up, and through pulse current and standard resistance simulation detection, the measurement accuracy is improved, and personal errors are reduced.

The invention relates to an electrically-assisted biaxial stretching forming limit testing system and method for a plated plate, and belongs to the technical field of bipolar plate testing.The testing method comprises the following steps that a bipolar plate sample is heated through pulse current and then stretched; and meanwhile, temperature, displacement, load and surface deformation images of the bipolar plate sample during stretching are collected, ultrasonic detection is carried out, and a basic forming limit curve is established based on a plastic instability criterion and is dynamically corrected. Dynamic evolution of necking initiation, expansion and interface failure in the stretching process can be synchronously tracked, actual working condition requirements can be better met, interface thermal mismatch aggravated by Joule heat is avoided, and the influence of insufficient sensitivity of a general ultrasonic algorithm can be made up through multi-physics field detection. The failure criterion is redefined as the critical state of plating-substrate interface separation, and the error of the critical failure point predicted by the forming limit curve is further reduced.

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.

The invention relates to the technical field of water electrolysis hydrogen production, and discloses a pulse current regulation and control method for water electrolysis hydrogen production, which comprises the following steps: S1, inputting parameter information acquired in real time and basic parameters acquired by initialization into a preset control algorithm model; s2, the control algorithm model calculates the frequency, the duty ratio and the peak current of the pulse current according to the input data; s3, the pulse power supply controller generates a corresponding pulse current signal according to the received parameters and outputs the pulse current signal to an electrode of the electrolytic bath; s4, the operation state of the water electrolysis hydrogen production process is evaluated every certain time interval, deviation data is fed back to the control algorithm model, and the calculation rule of pulse current parameters is optimized and adjusted; the hydrogen generation rate is remarkably increased, so that the hydrogen production efficiency is improved, the energy consumption in the water electrolysis hydrogen production process is effectively reduced, and the hydrogen production cost is reduced.

The invention provides a battery charging and discharging pulse frequency detection method and system, and the method comprises the steps: dividing a pulse current signal of a target battery during charging and discharging into a plurality of pulse signal segments, and determining the static deviation of the current of the target battery during charging and discharging based on the local current characteristics of each pulse signal segment; determining the time domain positioning error of the time interval through the static offset and the pulse width of the pulse current signal; monitoring the surface temperature of the target battery during charging and discharging, and determining the disturbance characteristics of the temperature of the target battery during charging and discharging to the current according to all the monitored temperatures and the pulse current signal; and performing pulse identification on the pulse current signal according to all the time domain positioning errors and disturbance characteristics to obtain an effective pulse time mark sequence of the target battery during charging and discharging, and determining an effective pulse frequency of the target battery during charging and discharging based on the effective pulse time mark sequence. According to the scheme, the influence of current signal drift on pulse frequency detection in the battery charging and discharging process can be reduced.

The invention provides a switch cabinet partial discharge detection device and method based on pulse current and ultrahigh frequency, and belongs to the field of switch cabinet partial discharge detection. The detection device comprises an acquisition unit, an analog signal processing unit and a digital signal processing unit. The digital signal processing unit comprises a demodulation module, a digital filter, a signal mixing module and a partial discharge identification module. The acquisition unit acquires an ultrahigh frequency signal and a pulse current signal; the analog signal processing unit processes the ultrahigh frequency signal and then transmits the ultrahigh frequency signal to the demodulation module, and processes the pulse current signal and then transmits the pulse current signal to the digital filter; the demodulation module is used for performing orthogonal down-conversion on a signal and then transmitting the signal to the signal mixing module; the digital filter is used for performing passband filtering on the received signal and then transmitting the signal to the signal mixing module; the mixing module is used for fusing the two paths of signals and then transmitting the signals to the partial discharge identification module; and the partial discharge identification module is used for carrying out partial discharge identification according to the received data. According to the invention, the early partial discharge phenomenon can be detected on line.

The invention discloses a partial discharge monitoring system, method, equipment and medium for a switch cabinet, and belongs to the technical field of insulation state monitoring of high-voltage electrical equipment, and the partial discharge monitoring system comprises an NO2 gas detection module, a pulse current signal acquisition module, a signal processing module, a data transmission module, a data analysis and diagnosis module and a user display and alarm module. According to the invention, by integrating dual monitoring technologies of NO2 gas detection and transient current signal acquisition and combining signal processing, data transmission, data analysis and diagnosis and a user display and alarm module, high-precision and high-reliability online monitoring of partial discharge of the high-voltage switch cabinet is realized; the defects that a traditional single method is prone to electromagnetic interference, low in sensitivity and not suitable for long-term online monitoring are overcome, and the anti-interference capacity, diagnosis accuracy and operation stability of a monitoring system are improved.

The invention discloses a PCB wiring design method and system considering a pulse current fusing effect, and relates to the technical field of PCB design. The method comprises the following steps: based on a differential impedance design principle, including design rules of a differential microstrip line and a differential strip line, determining parameters such as the width, the thickness, the line spacing and the medium thickness of a wire so as to meet the impedance value requirement; based on the heat balance equation of the current-carrying conductor, a current conductor heating model and a current-carrying conductor heat dissipation model are established; on the basis of differential impedance design and in combination with the proposed binary particle swarm optimization algorithm, the electromagnetic compatibility factor can be comprehensively considered, the problems of low efficiency and electromagnetic compatibility existing in large-scale wiring design are effectively solved, rapid and accurate design of large-scale wiring can be achieved through an efficient calculation process, and the method is suitable for large-scale wiring design. The design efficiency and quality are remarkably improved, and the design requirement for the routing pulse fusing effect of a high-speed PCB signal is met.

The invention discloses a transformer partial discharge mode identification method and system based on multi-source data fusion, and relates to the technical field of transformer maintenance, the transformer partial discharge mode identification system comprises an identification execution module, a multi-source data fusion module and a discharge identification module, the identification execution module is used for collecting ultrahigh frequency electromagnetic wave, ultrasonic wave and high frequency pulse current partial discharge signals; and the multi-source data fusion module is used for carrying out unified time reference and intensity normalization processing on a detection period and a sampling resolution ratio, carrying out dynamic adjustment on two output parameter characteristics according to a subsequent detection result, carrying out multi-source data fusion processing, and carrying out multi-source data fusion processing on the two output parameter characteristics. The discharge identification module is used for comprehensively judging a partial discharge mode according to the processed data, and the identification execution module comprises a UHF detection unit, an AE detection unit, an HFCT detection unit, a gas component detection unit and an ultrahigh frequency electromagnetic wave analysis module.

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 a dynamic thermal characteristic characterization method for a GaN HEMT (High Electron Mobility Transistor) radio frequency device. The method comprises the following steps: acquiring structural parameters of the GaN HEMT radio frequency device Establishing a three-dimensional finite element thermal model according to the structure parameters of the GaN HEMT radio frequency device; adjusting material parameters of the three-dimensional finite element thermal model according to an infrared thermal imaging test result of the GaN HEMT radio frequency device; based on the three-dimensional finite element thermal model, simulation is carried out under different environment temperatures and dissipation powers, thermal resistance of the GaN HEMT radio frequency device is obtained, and the relation between the thermal resistance and the environment temperatures and the dissipation powers is obtained; and establishing a Foster-form third-order RC heater network model of the GaN HEMT radio frequency device on the basis of the relationship between the thermal resistance and the ambient temperature as well as between the thermal resistance and the dissipated power and in combination with the transient pulse current response of the GaN HEMT radio frequency device. According to the invention, the transient thermal characteristics of the device under different working conditions can be rapidly represented.