73 results about "Impulse testing" patented technology

The invention relates to a power device dynamic on-resistance detection method, system and equipment, a storage medium and a program product, and is applied to a power device dynamic on-resistance detection system, and the power device dynamic on-resistance detection system comprises an upper computer, a controller, a double-pulse test circuit and a signal collector, the double-pulse test circuit is provided with a tested gallium nitride power device. The method comprises the following steps: under the condition that the test temperature of a tested gallium nitride power device meets a preset test condition, sending multiple groups of double-pulse test signals to a double-pulse test circuit through a controller; collecting multiple groups of electrical test parameters of the tested gallium nitride power device under the multiple groups of double-pulse test signals through a signal collector; and detecting the on-resistance of the tested gallium nitride power device through the upper computer based on the plurality of groups of electrical test parameters. By adopting the method, the detection accuracy of the dynamic on-resistance detection of the power device is improved.

The invention belongs to the field of battery management systems, and particularly relates to a battery model off-line identification method based on time-frequency domain combination, which comprises the following steps: acquiring an impedance spectrum through EIS test, extracting omega max, and directly calculating R1 and C1; performing a short-time direct-current pulse test, applying a short-time constant-current pulse to the battery, and collecting voltage response data; taking the frequency domain parameter as a constraint, and fitting a large time parameter by using time domain data; and model verification: integrating parameters and verifying the dynamic response precision of the full time scale. Small time constants are accurately captured through frequency domain analysis, and large time parameters are optimized through time domain fitting, so that dynamic errors of the model are reduced; frequency domain rapid decoupling reduces the time domain test duration, and the comprehensive test time is shortened; high-frequency and high-precision time domain acquisition equipment is not needed, and only a conventional EIS instrument and a pulse testing device are needed; the method is suitable for electric vehicles, energy storage systems and other scenes with high requirements for real-time performance and precision.

The invention discloses a double-pulse test protection circuit, relates to the field of power electronics, and is characterized in that a third switch, a current detection device and a control module are additionally arranged on the basis of an original double-pulse test circuit, and the purpose of the scheme is to collect the current value of a loop where an inductor is located through the current detection device; when the current value of the loop where the inductor is located is larger than a preset current threshold value (the current value of the loop is too high), the first switch is automatically switched off through the control module, and then the whole double-pulse test protection circuit is switched off. The current value in the double-pulse test protection circuit is not increased any more, and the reliability and safety of the scheme are ensured.

The invention discloses a pressure pulse testing method, system and device and a storage medium, and relates to the technical field of pressure testing, and the method comprises the steps: configuring a cyclic delay relay and a counting relay based on the pressure maintaining duration, the pressure releasing duration and the pulse frequency of a pressure pulse testing task; the circulating delay relay controls the water inlet electromagnetic valve to be continuously opened and the water return electromagnetic valve to be continuously closed, so that the water inlet module injects water and applies pressure to the to-be-tested pipeline; after the pressure maintaining duration is reached, controlling the water inlet electromagnetic valve to be continuously closed and the water return electromagnetic valve to be continuously opened through a circulating delay relay so as to release the pressure applied to the to-be-detected pipeline, and returning to the step of controlling the water inlet electromagnetic valve to be continuously opened and the water return electromagnetic valve to be continuously closed; and the return execution times are accumulated through a counting relay, and after the return execution times reach the pulse times, execution of the pressure pulse test task is stopped. According to the invention, accurate, controllable and repeatable pressure pulse testing of the cooling system is realized.

The invention discloses a power semiconductor device dipulse test system and method integrated with a temperature control module, the test system is small in size and portable, is integrated with a temperature control heater, can measure the dynamic parameters of a power semiconductor device from room temperature to the maximum junction temperature of a chip, and can determine the temperature of the power semiconductor device through the comparison of the dynamic parameters in the temperature range. The method can guide an engineer to perform reasonable device model selection, helps the engineer to deeply understand the influence of the temperature on the device performance, can optimize the system design, improves the reliability and efficiency of the device in practical application, and meets the industrial standard requirements at the same time. Moreover, the test method is simple, the potential of the power semiconductor device can be known to the greatest extent through the tests, and the stable operation of the power semiconductor device under various environmental conditions is ensured.

The present application provides a double-pulse test method, circuit and system. The double-pulse test method controls the inductance of the load inductor connected to the module to be tested to be less than the first threshold value during the first pulse of controlling the conduction of the switch tube to be tested. That is, even if the module to be tested adopts a load inductor with a smaller inductance during the first pulse, the energy transmitted from the DC bus capacitor to the load inductor can be reduced, and the degree of bus voltage drop of the high-power module when performing double-pulse testing can be reduced; no external capacitor pool is required, thereby avoiding the problem of low accuracy of test results caused by the external capacitor pool in the prior art. In addition, after the end of the first pulse, the present application can adopt a load inductor with a larger inductance. Therefore, during the double-pulse interval, the energy consumption of the load inductor is slow, and the current difference between the load inductor at the beginning of the second pulse and the end of the first pulse is small, thereby ensuring the accuracy of the test results.

The application discloses a kind of fresh stewed bird's nest cold chain transport process temperature field monitoring method and system, belong to cold chain monitoring technical field.Through heat inertia pulse test, heat capacity and thermal resistance are obtained, which are respectively taken as node attribute and edge attribute;Optimize sensor distribution based on the principle of random walk entropy minimization;Construct a dynamically updated directed weighted heat propagation path graph;Using sparse deconvolution combined with system impulse response function matrix, separate event excitation and identify abnormal events;Linearize the heat balance inverse problem in the rolling time domain, reconstruct the product temperature sequence and heat flow vector, calculate the equivalent heat damage dose, and generate the solidified causal directed acyclic graph evidence chain.The above scheme integrates heat inertia into the graph model, realizes event and heat response separation, risk quantification and full-process traceability, effectively improves the accuracy and reliability of cold chain temperature monitoring.

A series Z-source circuit breaker including a semiconductor switch that breaks source power being provided to a load in response to overcurrent. An electromechanical switch is electrically coupled in parallel with the semiconductor switch, a first capacitor is electrically coupled to an output side of the semiconductor switch, a second capacitor is electrically coupled in parallel with the semiconductor switch, and a delay circuit is electrically coupled in series with the first capacitor. The semiconductor switch is in an open position and the electromechanical switch is in a closed position when overcurrent is not present. Upon detection of overcurrent the semiconductor switch is closed, the electromechanical switch is opened and the delay circuit is controlled to delay when reverse bias current is provided from the first capacitor to the semiconductor switch to prevent source power from being provided to the load to give the electromechanical switch time to open.

The present invention discloses a dual-pulse test system, which is configured to include: a load inductor, a test power supply is connected to a power device under test through the load inductor; a first freewheeling device, after the power device under test is tested, it forms a freewheeling loop with the load inductor; a pulse generator, which is used to provide the dual pulses required for testing the power device under test; and a failure protection circuit, when the power device under test is in a failure state, it cuts off the test power supply and constructs a freewheeling loop to make the loop current no longer increase. The present invention is configured with a failure protection circuit, which can timely cut off the power supply when the power device under test is in a failure state, and can form a freewheeling loop to realize that the loop current no longer increases, preventing the device from being burned out due to the failure of the power device under test, and playing a protective role.

The invention relates to the technical field of semiconductor device testing, in particular to a semiconductor device switching time double-pulse testing device and system capable of improving the precision, and the device comprises an air chamber lower shell and an air chamber upper shell which can move up and down relative to the air chamber lower shell. When the air chamber upper shell descends and is closed and matched with the air chamber lower shell, a closed cavity can be formed, the semiconductor device is arranged in the closed cavity, and a pin of the semiconductor device is in conduction contact with the test conductor under the pressure of the air chamber upper shell; the closed cavity is formed by the air chamber lower shell and the air chamber upper shell, and the air supply pipe and the constant-temperature fan are matched, so that the temperature can be kept more stable when a semiconductor device is subjected to a switching time double-pulse test, and the test precision is improved.

The invention discloses a pulse testing device for an electromagnet, and the device comprises an oil inlet plate which is internally provided with a three-way oil channel; the oil inlet joint is mounted on the oil inlet plate; an oil duct in the oil inlet joint is communicated with a first end of the three-way oil duct; the rail pressure sensor is mounted on the oil inlet plate; an oil duct in the rail pressure sensor is communicated with a second end in the three-way oil duct; an electromagnet; the electromagnetic valve further comprises a sealing base plate, the electromagnet is installed on the electromagnetic valve installation face in the oil inlet plate through a fastener and presses the sealing base plate on the electromagnetic valve installation face in the oil inlet plate, an oil cavity is formed in the sealing base plate, and the oil cavity is communicated with the third end in the three-way oil way. The liquid medium can carry out pulse testing on the electromagnet in the oil cavity through different pressures. The device is simple and compact in structure, the strength of the electromagnet can be tested according to different rail pressure pulses, a more impact-resistant electromagnetic material is selected to meet the reliability requirement according to the pulse test result, and a scientific basis is provided for fuel system electromagnet material selection.

The invention relates to a double-pulse test method and a test circuit. The method comprises the following steps: providing a double-pulse test circuit; the double-pulse test circuit comprises an energy charging circuit and a resonance circuit, the resonance circuit is a half-bridge LC resonance circuit or a full-bridge LC resonance circuit, and the energy charging circuit comprises a power supply and a bus capacitor; the bus capacitor is charged through the power supply; in response to charging the bus capacitor to the target voltage, disconnecting the power supply from the bus capacitor and the resonant circuit; and applying a control voltage to the control ends of the upper bridge and the lower bridge in the resonant circuit, obtaining a gate-source voltage, a drain-source voltage and a drain-source current of each switching tube in the resonant circuit under the control voltage, and obtaining a test result according to the gate-source voltage, the drain-source voltage and the drain-source current. According to the invention, the characteristics of the MOS tube in the LLC converter during actual work can be analyzed. Based on the test result obtained by the method, an important reference basis can be provided for model selection of the primary MOS transistor of the LLC converter, and poor products caused by design errors and improper model selection are avoided.

Systems may include a hot solution supply and a cold solution supply utilizing flow controllers, temperature control units, valve systems, various temperature and pressure sensors, an inspection zone and recirculation systems. A method for thermal management and thermal impulse testing may include configuring a hot and cold solution system and monitoring temperature profiles in each system and alternating the flow of the hot and cold cycles then monitoring the components tested in the inspection zone.

The utility model relates to the technical field of oil cylinder pulse testing, in particular to a cylinder body fixing device for servo pulse testing, which comprises a plurality of supporting blocks. The device further comprises two guide rails which are arranged in parallel; the base plate is fixed at one end of the guide rail; the at least one adjusting plate can slide in the length direction of the guide rail; the middle section of the driving rod is rotationally connected with the base plate; the number of the swing rods is at least one, and each swing rod is hinged to the center of the corresponding adjusting plate; the end, closest to the driving rod, of the swing rod is hinged to the driving rod. Only one end part of each oscillating rod is rotationally connected with one end part of the adjacent oscillating rod; every two adjacent swing rods form a V-shaped structure; the device is simple in structure, can rapidly and conveniently adjust the distance between the supporting blocks, is suitable for testing oil cylinders of various sizes, and improves the testing efficiency.

The invention discloses an intelligent decision-making fast sorting method and sorting system for retired power batteries, and relates to the technical field of battery recycling. The method comprises the following specific steps: measuring the open-circuit voltage of a battery monomer, dynamically adjusting a screening threshold according to a temperature compensation algorithm, comparing the open-circuit voltage value with a preset range subjected to temperature correction, and screening out a first batch of candidate battery monomers; applying a multi-order pulse test working condition to the first batch of candidate battery monomers to obtain dynamic response parameters, and screening out a second batch of candidate battery monomers according to the dynamic response parameters; carrying out extended frequency band impedance spectrum test on the second batch of candidate battery monomers to obtain an impedance characteristic matrix; and inputting the open-circuit voltage, the dynamic response parameter and the impedance characteristic matrix into a fuzzy neural network decision model, outputting a sorting decision result, and finally grading the single batteries. According to the method, the consistency and the safety of the cascade utilization battery pack are remarkably improved, and meanwhile, the efficiency and the sorting precision are improved on the basis of reducing the sorting cost.

This invention discloses a gas cylinder pressure pulse testing system, belonging to the technical field of testing equipment. It includes a first heat exchanger, a second heat exchanger, and a first integrated heating and cooling unit. The test medium output from the pressure pulse generating device sequentially passes through the first and second test medium channels and enters the gas cylinder. The heat exchange medium within the first integrated heating and cooling unit sequentially passes through the outlet end of the first integrated heating and cooling unit, the inlet end of the second heat exchange medium, the outlet end of the second heat exchange medium, the inlet end of the first heat exchange medium, the outlet end of the first heat exchange medium, and the inlet end of the first integrated heating and cooling unit, forming a heat exchange cycle. The test medium flowing through the second test medium channel can exchange heat with the heat exchange medium flowing through the second heat exchange medium channel, and the test medium flowing through the first test medium channel can exchange heat with the heat exchange medium flowing through the first heat exchange medium channel. This invention has high temperature regulation efficiency, improving the temperature control effect of the test medium.

The invention relates to the technical field of semiconductors and power converters, and particularly discloses a multifunctional analysis system for electrical characteristics of a gallium nitride switching device, which is characterized in that a GUI interface implementation module comprises a double-pulse test circuit diagram displayed in a main interface, a software function selection button and a software closing button; the double-pulse test circuit diagram shows a test circuit schematic diagram of the gallium nitride switching device, the software function selection button is used for selecting different prediction analysis functions, and the software closing button is used for closing the system; and the Simulink model implementation module constructs a double-pulse test simulation circuit based on a Simscape model converted by using a Spice model, calculates simulation data, operates simulation and outputs the simulation data. According to the method, the voltage oscillation waveform and the crosstalk waveform of the gallium nitride switching device can be accurately predicted, a user can select device manufacturers and models and set parameters of a circuit used for simulation, and the voltage oscillation and crosstalk conditions of the gallium nitride switching device can be visually observed.

The invention relates to the technical field of electronics, and discloses a double-pulse test method, device and equipment and a storage medium, and the method comprises the steps: obtaining multi-source feature information of a tested device to generate a device feature code; performing a double-pulse test based on the device feature code, and collecting time-frequency domain data of the tested device in the test process; performing oscillation feature recognition on the time-frequency domain data to obtain oscillation feature data; adjusting the operation state of the double-pulse test based on the oscillation characteristic data, and terminating the test until a preset suppression target is met or a preset repeated test threshold value is reached, so as to obtain a final test result; according to the invention, on the basis of feature recognition and data acquisition, continuous oscillation adjustment is realized, the optimal test operation state adaptive to the tested device is generated, the core problems of much manual intervention, long test period and poor oscillation suppression effect of the existing double-pulse test are solved, and the stability of the double-pulse test is improved.

The invention relates to the technical field of power supply performance optimization, and discloses a power supply performance optimization method and system based on a high-voltage pulse technology. The method comprises the steps of obtaining an original electrical parameter set of to-be-optimized power supply equipment, extracting high-voltage pulse response characteristics and constructing a power supply dynamic response model; comparing the model with a standard power supply reference model, generating a performance difference feature set to screen key optimization indexes, monitoring real-time operation parameters of equipment, and calculating an association degree matrix of the key optimization indexes and the real-time operation parameters; determining an optimization priority sequence based on the correlation degree matrix, positioning a core optimization node, and executing a high-voltage pulse test to generate a node test data set; and extracting an optimized feature vector from the data set to formulate a high-voltage pulse adjustment strategy, analyzing an adjustment parameter combination in the strategy, and matching a corresponding standard adjustment specification. The method can accurately capture the dynamic performance characteristics of the power supply, and improves the optimization pertinence and normalization.

The utility model discloses a double-pulse test platform capable of preventing connection wires from falling off, and particularly relates to the technical field of double-pulse test platforms, which comprises an experiment table and a plurality of current clamps, and is characterized in that the right part of the upper end of the experiment table is fixedly connected with a control cabinet body, and the left part of the upper end of the experiment table is fixedly connected with an external inductor body; a plurality of bearing plates are fixedly connected to the middle of the upper end of the external inductor body in a linear array distribution mode, the current clamps and the bearing plates are movably installed in a one-to-one correspondence mode, and a plurality of anti-disengaging assemblies are arranged in the middle of the upper end of the external inductor body in a linear array distribution mode. Reset assemblies are symmetrically arranged on the left portion and the right portion of the upper side of each bearing plate, and limiting assemblies and clamping assemblies are symmetrically arranged on the left side and the right side of each reset assembly. According to the double-pulse test platform capable of preventing the connection wire from falling off, the anti-falling assembly is arranged, and after the current clamp is inserted into the slot arranged in the anti-falling assembly, the plug part of the current clamp is pressed.

The embodiment of the invention discloses a power device high-temperature reverse bias test temperature determination method, which comprises the following steps of: fixing a power device sample in a heating device, and short-circuiting a grid electrode and a source electrode of the power device sample; performing pulse testing on the power device sample to obtain a temperature and leakage current relation curve; and placing the power device sample on a radiator, and carrying out staged temperature rise and stabilization to record leakage current so as to determine the test temperature. By implementing the method provided by the embodiment of the invention, the junction temperature of the chip can be accurately measured, and the reliability and accuracy of the high-temperature reverse bias test are ensured.

The application provides a low-temperature double-pulse test platform and method, and relates to the technical field of power device testing.The platform comprises a refrigeration compressor, a cooling platform, an enclosure, an air extraction unit, a temperature acquisition unit, a parameter acquisition unit and a control unit.The control unit is used for acquiring surface temperature information of the power device to be tested, platform temperature information of the cooling platform and thermistor parameters under the action of a calibration pulse during the cooling process, determining the corrected equivalent junction temperature parameters of the power device to be tested, and controlling the double-pulse test loop to perform double-pulse testing when the corrected equivalent junction temperature parameters enter a target test temperature window.The method introduces a calibration pulse and thermistor parameters on the basis of a low-temperature environment, corrects and characterizes the actual thermal state of the power device to be tested, and controls the double-pulse testing time in combination with the target test temperature window, so as to improve the accuracy, consistency and repeatability of low-temperature double-pulse testing.

The invention provides a batch detection device and method for the residual capacity of disposable batteries in a high-altitude environment, and belongs to the technical field of lithium thionyl chloride battery detection. The device comprises a detection device main body and an upper computer, wherein the device main body comprises a power supply unit, a temperature monitoring unit, a control unit, an indication unit, a switching unit, a battery test unit and a parameter acquisition unit; the power supply unit comprises a power interface, a power switch, a switching power supply and a step-down circuit; the temperature monitoring unit comprises a temperature measuring module and a thermocouple. The control unit comprises a controller MCU. The indicating unit comprises a loudspeaker, a switching indicating lamp and a three-color indicating lamp; the switching unit comprises a depassivation switching circuit, a multi-channel switching circuit and a pulse switching circuit; the battery test unit comprises a battery socket and a resistive load; the parameter acquisition unit comprises a pulse test and reference voltage acquisition module. According to the method, the problem that the residual capacity of the disposable battery cannot be accurately detected due to a continuous passivation phenomenon is solved, and accurate prediction of the residual capacity of the disposable battery can be realized.

The invention provides a power battery equivalent circuit model parameter identification method and device and a storage medium, and relates to the technical field of power batteries. The method comprises the following steps: acquiring pulse test data of a power battery under a preset working condition, wherein the pulse test data comprises test current time sequence data and terminal voltage time sequence data; based on the pulse test data and the open-circuit voltage of the corresponding working condition, calculating voltage difference time sequence data used for representing the polarization dynamic state of the battery; taking the test current time sequence data as an input signal, taking the voltage difference time sequence data as an output signal, and obtaining a transfer function model for describing the dynamic characteristics of the battery and parameters of the transfer function model through system identification; and based on a parameter conversion relationship between the physical structure of the equivalent circuit model and the transfer function model, mapping parameters of the transfer function model into polarization resistance and polarization capacitance parameters of the power battery equivalent circuit model.

Provided are a charging method and apparatus, and an electronic device, a computer-readable storage medium, a computer program product and a computer program. The method comprises: a charging device outputting a pulse test voltage to a transmitting coil of the charging device; if pulse test information corresponding to the pulse test voltage meets a test pass condition, outputting a charging test voltage to the transmitting coil and a resonant capacitor; at least on the basis of a transmission quality factor corresponding to the charging test voltage, determining whether to enter reduced-power charging; if reduced-power charging is entered, sending power reduction information to a charged device; the charged device receiving the power reduction information sent by the charging device, and on the basis of the power reduction information, determining target charging power for the charged device; and reducing charging power of the charged device by using the target charging power as a target, and then performing charging.

The utility model provides a lightning impulse testing device for a high-power high-voltage resistor, which is used for solving the technical problem that the conventional lightning impulse testing device can only carry out lightning impulse testing on a high-resistance high-power high-voltage resistor and cannot carry out lightning impulse testing on a low-resistance high-power high-voltage resistor below dozens of ohms. According to the lightning impulse testing device of the high-power high-voltage resistor provided by the utility model, the pulse capacitor is arranged in the power supply module, and the pulse capacitor is composed of a plurality of pulse capacitors; the lightning impulse test of the high-power high-voltage resistor with different resistance values can be realized by simply adjusting the connection mode of the plurality of pulse capacitors in the pulse capacitor or increasing or decreasing the number of the pulse capacitors, and a rapid and efficient lightning impulse measurement mode is provided for the high-power high-voltage resistor with a wide resistance value range.

The invention discloses a double-pulse test platform optimization method and device, and the method comprises the steps: building a double-pulse test platform simulation model according to the actual structure of each element in a test loop; elements in the test loop comprise an IGCT, a diode and a clamping capacitor. And taking the stray inductance value as a target function, and optimizing spatial layout parameters of each element in the double-pulse test platform simulation model by adopting a PSO algorithm to obtain an optimal double-pulse test platform spatial layout. According to the invention, the spatial layout of the platform can be effectively optimized, the stray inductance of a loop is reduced, the overvoltage borne by the IGCT at the turn-off moment in the dipulse test process is suppressed, and the problems of large voltage overshoot and easy damage of devices in the dipulse test are solved.

The invention discloses an inductance control system, a pulse test circuit and a power semiconductor. The control system comprises an inductance control circuit. A first voltage sampling point is arranged on a switch branch connected with the load to be tested; a second voltage sampling point is arranged on a switch branch connected with a load inductor, and meanwhile a current monitoring device is arranged on the branch; a voltage monitoring device is arranged, and branch voltage is obtained according to the potential difference between the first voltage sampling point and the second voltage sampling point; the control platform is connected with the current monitoring device and the voltage monitoring device; the control platform receives a switch control instruction when the voltage monitoring device and the current monitoring device monitor that the voltage and the current are both zero; controlling the switches on the two branches to be closed, and executing a pulse test process for the to-be-tested load; and after the execution is finished, the control platform controls the switches on the two branches to be switched off, and the inductor switching efficiency is improved.

The utility model discloses a temperature alternating and pressure pulse testing device suitable for a new energy automobile heat exchange system, and relates to the technical field of testing devices. The device comprises a supporting frame, a hot water tank is arranged on the supporting frame, a transition water tank is connected to the supporting frame, a cold water tank is connected to the supporting frame, an electric box is arranged on the supporting frame, a water pump is fixedly arranged on the upper surface of the supporting frame, and a pipeline is connected to the water pump. Through an advanced temperature and pressure control system, the device can accurately simulate extreme temperature and pressure changes in actual working conditions, so that the performance and the reliability of parts are evaluated more accurately. The device also has high flexibility and applicability, can be applied to tests of various different types of heat exchange system components, and meets the requirements of different test conditions. Meanwhile, the test efficiency can be remarkably improved through the efficient test process, and rapid research and development and quality control are supported.

The invention discloses a double-pulse test method, which relates to the technical field of power module test, and comprises the following steps: S1, building a double-pulse test platform; s2, setting parameters; s3, executing a double-pulse test; s4, exporting test parameters; and S5, parameter verification. According to the double-pulse test method, by optimizing the design of a test platform, electromagnetic interference is effectively reduced, the accuracy of waveform and parameter measurement is ensured, the width of the first pulse and the test inductance are quantitatively calculated through a formula, it is guaranteed that the test current accurately reaches a target value, and a foundation is laid for switch parameter extraction; moreover, a test voltage increasing criterion, waveform monitoring key points and a verification process after driving parameter adjustment are defined, consistency and reliability of test results are ensured, finally parameters such as switching loss, voltage spike and delay time are comprehensively extracted, actual characteristics of the power module are directly reflected, and the test accuracy is improved. And a key reference is provided for converter design such as drive circuit optimization and heat dissipation design.