136 results about "Electric stress" patented technology

The invention discloses a high-temperature test method for a power semiconductor device, and relates to the technical field of quantum thermal control, and the method comprises the steps: collecting a temperature field and surface conductivity data of an edge region of the power semiconductor device in real time, and synchronously applying an electric stress of a specified working voltage to the power semiconductor device; an internal thermal displacement field is reconstructed based on the temperature field, a calibration thermal displacement field is generated, and the topological number of the edge area is calculated in combination with the surface conductivity data; generating a thermal failure risk distribution map according to the spatial position of the peak value of the thermodynamic entropy yield, and locking a high-entropy variable power dense region; and the electric stress applying direction is dynamically adjusted in association with the high-entropy variable power dense area, and a thermal failure diagnosis report is output after a full-period high-temperature test is completed. According to the method, submicron-level real-time positioning of the thermodynamic entropy generation peak value under the high-temperature working condition is achieved through collaborative mapping of the quantized calibration thermal displacement field and the tensor field of the classic temperature gradient.

The invention relates to the technical field of packaging, in particular to a double-end power supply and double-face heat dissipation packaged parallel half-bridge power module, which is characterized in that a SiC MOSFET chip and a diode chip are arranged between an upper DBC board and a lower DBC board, the bottom ends of the SiC MOSFET chip and the diode chip are connected with the lower DBC board through solder layers, and the lower DBC board is connected with the lower DBC board through solder layers. The top end of the SiC MOSFET chip and the top end of the diode chip are respectively connected with a conducting strip through a solder layer, and the conducting strip is connected with the upper DBC board through the solder layer. According to the invention, the two DBC boards and the buffer conducting strip realize electrical connection of all parts in the module, so that the whole packaging structure of the module is simplified; two-sided heat dissipation of the SiC MOSFET and the diode chip is realized through the copper-clad layers arranged on the surfaces of the two DBC boards, the problem of heat flow concentration of the SiC chip under the high-frequency working condition is effectively solved, and the problem of'heat-electric stress' coupling of the module under the high-frequency working condition is solved through system coupling current balance and two-sided heat dissipation capability, so that the module has multi-unit self-current-sharing, and the service life of the module is prolonged. The high-frequency switch stress is inhibited and balanced; and the power density is improved.

The invention discloses an online early warning method and detection system for a power supply, and belongs to the technical field of power supply monitoring, and the method comprises the steps: collecting an electric stress parameter of a to-be-monitored power supply in real time based on an early warning sampling frequency, and carrying out the preprocessing; once the real-time electric stress value is greater than or equal to the early warning safety threshold value, determining that the event is a potential abnormal event, constructing an abnormal time window, carrying out abnormal feature analysis, and carrying out recessive parameter inversion in combination with a digital twinborn body to generate an abnormal feature set; and calculating a real-time health index, once a potential abnormal event is identified, correcting the health index, generating an event health index, calculating a health decline rate, predicting a health index in a future time period and carrying out health early warning by combining the abnormal feature set, so that cost increase of reversible abnormal excessive early warning is avoided, and damage caused by missed judgment and accumulation is prevented.

The invention provides a power device failure positioning method and system based on multi-physics field coupling, and the method comprises the steps: applying dynamic electric stress to a tested power device, and synchronously collecting the thermal field data, electric field data and mechanical field data of the tested power device; wherein the thermal field data is used for representing the surface temperature distribution of the to-be-measured power device, the electric field data is used for representing the electrical parameters of the to-be-measured power device, and the mechanical field data is used for representing the internal morphology of the to-be-measured power device; synchronizing the thermal field data, the electric field data and the mechanical field data through timestamps, and aligning in a preset three-dimensional coordinate system to obtain multi-dimensional alignment data; and generating a failure probability distribution diagram according to the multi-dimensional alignment data so as to determine corresponding failure point coordinates. Through multi-physics field data coupling analysis, the problem of failure point fuzzy positioning in a complex packaging structure is solved, and the detection sensitivity under a dynamic working condition is improved.

The invention relates to a power supply module, electronic equipment and a preparation method of the power supply module, the power supply module comprises a substrate, a power supply chip, a first electronic device and a second electronic device, the power supply chip is arranged in the substrate, the first electronic device is arranged on the surface of one side of the substrate along the thickness direction of the power supply module, and the second electronic device is arranged on the surface of the other side of the substrate. The first electronic device is electrically connected with the power supply chip, the side, away from the substrate, of the first electronic device is used for being electrically connected with the circuit board, the second electronic device comprises an inductor, the inductor comprises a magnetic core and a magnetic packaging part, the magnetic core is electrically connected with the power supply chip, and the magnetic core is packaged on the surface of the side, away from the first electronic device, of the substrate through the magnetic packaging part. The power supply module with the structure occupies a small area, can shorten a power routing path, reduce parasitic power routing path, reduce power loss, reduce an electric stress risk, can reduce the overall thickness of the power supply module, and improves the layout space of the first electronic device and the second electronic device, thereby facilitating the improvement of the power supply performance of the power supply module.

The invention discloses a reliability evaluation method for a conductive thermal interface material. The method comprises the following steps: manufacturing a substitute sample according to a conductive thermal interface material bonding layer structure of an actual device and a sintering process; gradually increasing the environment temperature to test an actual device, and taking the amplification of the interface thermal resistance as a failure threshold value when the performance of the device cannot meet the requirement; according to the set temperature stress and current stress conditions, thermoelectric stress tests are carried out on all the alternative samples, the tests are stopped after a period of time, and interface thermal resistance tests are carried out; when the amplification of the interface thermal resistance of the alternative sample exceeds a failure threshold value, stopping the thermoelectric stress test of the alternative sample and recording the failure life until the amplification of the interface thermal resistance of all the alternative samples exceeds the failure threshold value; and obtaining the failure life of the conductive thermal interface material according to the failure life data of all the alternative samples, thereby realizing reliability evaluation of the conductive thermal interface material. According to the method, the reliability of interface thermal resistance degradation caused by the electromigration effect can be effectively evaluated.

The invention relates to an accelerated test system and method based on a weak link of an electronic component, and belongs to the technical field of electronic product testing, and the method comprises the steps: carrying out the hierarchy analysis and modeling preparation of a whole machine structure, and carrying out the structural layering of a target whole machine system; weak link identification: identifying a key failure path influencing the reliability in the whole machine, and determining a weak component; acceleration pre-test: carrying out acceleration pre-test on the identified weak component, and obtaining degradation behavior data of the weak component through multi-stage acceleration stress loading; constructing a complete machine acceleration model, and calculating the influence of temperature stress, electric stress and vibration stress on the failure degradation rate of the product; acceleration factor calculation: calculating an acceleration factor based on the activation energy of the weak link part; and predicting the service life of the whole machine through acceleration factors, failure mode analysis and component service life data. The failure of the whole machine is converted into the failure of a weak link; the service degradation process of the whole machine can be reflected more truly, and the accuracy of a prediction result is improved.

A Radio Frequency Identification Device (RFID) tag capable of withstanding electrical stress from induction sealing arrangement and provide shielding against the metallic seal required for induction sealing includes an antenna coil partitioned into a main coil and an auxiliary coil. Both the coils are collocated on two separate overlapping or non-overlapping regions of a dielectric substrate without any galvanic connection therebetween. The main coil is operatively connected with semiconductor chip on the dielectric substrate for necessary RFID activities, while the auxiliary coil operates as a resonator tuned to a certain resonating frequency that enables the auxiliary coil to act as a virtual open circuit to induction sealing frequency and help the semiconductor chip to withstand the electrical stress from induction sealing. The auxiliary coil carries a current during interrogation of the tag by an RFID Reader which provides shielding against eddy currents on the metal seal for induction sealing.

The invention discloses a GIS metal particle defect detection test platform and a detection method, and relates to the technical field of high-voltage electrical equipment detection and fault diagnosis, and the platform comprises a GIS equipment module which is used for simulating an actual GIS equipment operation environment and an internal metal particle defect scene; the alternating current voltage module is used for applying processing frequency voltage to the GIS equipment module; the impulse voltage module is used for superposing impulse voltage on the basis of power frequency voltage to realize electric stress coupling; the physical vibration module is used for applying controllable mechanical vibration to the GIS equipment module, simulating impact disturbance generated by switch operation, and enabling internal metal particles to be in a suspended or moving state; the protection device is used for ensuring the effective superposition of the power frequency voltage and the impulse voltage and blocking the reverse voltage; and the detection equipment is used for monitoring the motion trail, the charge characteristic and the partial discharge signal of the metal particles in the GIS equipment module in real time so as to carry out defect mechanism analysis. According to the invention, complex working conditions in GIS operation can be truly simulated.

The invention relates to the technical field of cable accessories, in particular to an electret electric stress evacuation high-voltage thermal shrinkage cable accessory and a preparation method. The method includes: acquiring actual electric field intensity at a stress cone interface, and accordingly judging whether an initial stress cone thickness range needs to be adjusted; for the condition that the thickness range of the initial stress cone does not need to be adjusted, verifying the adaptability of the thickness range by simulating the maximum electric field intensity; after verification is passed, stress cone surface temperature data in a stable power transmission state are detected, and the local thickness is adjusted according to the temperature increasing rate; when verification is not passed, the temperature fluctuation abnormal value of the abnormal temperature data of the fluctuating power transmission state is detected, the adjustment value of the thickness range of the stress cone is adjusted according to the temperature fluctuation abnormal value, and the initial thickness range is set based on the historical maximum power transmission power. According to the method, the thickness of the stress cone applied to wind power generation is accurately adjusted through the abnormal change area ratio, the number of abnormal change areas and the temperature increasing rate.

The utility model discloses a converter module electrical stress test fixing tool, which comprises N voltage probe placing boxes, a main fixing shaft, a first support member and a second support member, and is characterized in that the N voltage probe placing boxes are hinged on the main fixing shaft side by side along the axial direction of the main fixing shaft and rotate along the main fixing shaft; the two ends of the main fixing shaft are connected with the first supporting component, the first supporting component is connected with the second supporting component, the second supporting component is connected with a switching fixing piece, and the first supporting component conducts fine adjustment of the rotation angle relative to the second supporting component. The second supporting component is adjusted up and down relative to the switching fixing piece. According to the tool, the voltage probe can be rapidly and firmly connected to the test point of the converter module, the probe can be rapidly removed in the test process, the position and angle of the probe can be adjusted according to actual test requirements, and accurate butt joint of the probe and the test point of the converter module is ensured.

The invention relates to a system and method for reducing electrical stress of a switching device. Methods, systems, and devices are provided for techniques for a switching device that controllably couples a first conductive line to a second conductive line or decouples the first conductive line from the second conductive line. The switching device includes a branch of a primary transistor and a branch of a circuit. At least one of the one or more branches of the primary transistor includes a plurality of primary transistors connected in series. The control terminals of the plurality of primary transistors are connected together and receive a primary control signal, and the plurality of primary transistors are controllably switched to couple the first conductive line to the second conductive line or to decouple the first conductive line from the second conductive line. A plurality of circuits are configured to provide a gradient voltage level between the first conductive line and the second conductive line such that drain-source voltages of the plurality of primary transistors are limited to a maximum allowable value.

The invention relates to a component test method and system based on pre-test degradation data, and belongs to the technical field of electronic product testing, and the method comprises the following steps: carrying out the hierarchical analysis and modeling preparation of a whole machine structure, and carrying out the structural layering of a target whole machine system; acceleration pre-test: carrying out acceleration pre-test on the component, and obtaining degradation behavior data of the component through multi-stage acceleration stress loading; constructing a complete machine acceleration model, and calculating the influence of temperature stress, electric stress and vibration stress on the failure degradation rate of the product; calculating an acceleration factor, predicting the service life of the electronic product under the actual use condition by analyzing degradation data in the acceleration pre-test, and calculating the acceleration factor; and predicting the service life of the whole machine through acceleration factors, failure mode analysis and component service life data. By identifying weak components in the whole machine, only key components are subjected to an acceleration pre-test.

An ESD circuit includes an ESD clamp device with an ESD clamp transistor. The ESD clamp transistor has two sets of one or more body contacts. One set is coupled to a supply voltage rail and the other set is coupled to a clamp activation circuit. The clamp activation circuit is coupled to a clamp device. During an electrical stress event of a sufficient severity affecting a supply voltage rail, the activation circuit makes the clamp device conductive to transfer charge between supply voltage rails.

The present application provides a method for monitoring a through fault current. The method may involve: detecting a through fault; calculating an electrical stress, peak current, and duration of the through fault; determining two sets of percentage state changes associated with the through fault; assigning a respective set of weights and criticalities to each set of percentage state changes; calculating a mechanical state change based on the first set of percentage state changes and the first set of weights and criticalities; calculating a thermal state change based on the second set of percentage state changes and the second set of weights and criticalities; calculating a cumulative state change based on the mechanical and thermal state changes; and training a machine learning model using the electrical stress, peak current, duration, two sets of percentage state changes, and mechanical, thermal, and cumulative state changes.

To provide an electronic device capable of preventing breakdowns and malfunctions from occurring.SOLUTION: The electronic device includes: a metal housing with a flat part; a connector terminal that protrudes from the inside to the outside via the through hole in the flat part of the metal housing, to which an electrical stress is input; and a component made of a static dissipative material that is surrounded by the inner periphery of the flat part of the metal housing and encloses the outer circumference of the connector terminal along the direction in which the connector terminal protrudes.SELECTED DRAWING: Figure 5A

This application discloses a fully dry, environmentally friendly rigid air-insulated cable terminal and its manufacturing method. It employs an integrated terminal block and a prefabricated bushing with pre-formed electrical stress components. During terminal installation, the cable is simply threaded through the base and then through the pre-formed bushing with electrical stress components, followed by wiring and sealing with the integrated terminal block. This rapid installation significantly improves efficiency. Furthermore, the pre-formed bushing with electrical stress components uses silicone rubber stress cones to divide the composite bushing into air-insulated and solid-insulated sections. This structure allows for the filling of the air-insulated section with atmospheric pressure air to create an air-insulated terminal, eliminating concerns about environmental pollution caused by insulation leakage.

The invention discloses an insulating part interface defect detection method and device and electronic equipment, and the detection method comprises the following steps: S1, applying mechanical stress, thermal stress and electric stress to an interface area of a test sample at the same time, so as to couple and excite measurable response related to the interface defect; s2, synchronously monitoring response signals of at least two different physical properties caused by the interface defects while applying the multiple stresses; s3, identifying and / or positioning the interface defect based on the characteristics of the at least two response signals and the relevance of the at least two response signals in time and space; wherein the loading parameters of at least two of the mechanical stress, the thermal stress and the electric stress are subjected to closed-loop adjustment on the basis of each other, so that high-sensitivity and high-reliability identification and accurate positioning of tiny and hidden interface defects which are difficult to identify by a traditional method can be realized; and the accuracy and comprehensiveness of state detection of the insulating part are effectively improved.

This invention relates to the field of industrial Internet of Things (IoT) technology, and particularly to a data fusion decision optimization method, device, and storage medium based on artificial intelligence. The method includes: identifying start-stop events and extracting mechanical impact response windows and thermal relaxation response windows; determining impact characteristic metrics based on vibration signals within the mechanical impact response windows, determining thermal relaxation characteristic metrics based on temperature decay processes within the thermal relaxation response windows, and thus determining the insulation fatigue damage degree; determining a fatigue accumulation index based on the impact characteristic metrics and thermal relaxation characteristic metrics, and thus determining the insulation fatigue damage degree; determining an electrical stress accumulation metric based on stator current harmonic characteristics; determining the health status by comprehensively considering the insulation fatigue damage degree and electrical stress accumulation metric within a management cycle, and providing maintenance prompts. This invention achieves accurate assessment and graded early warning of insulation health status, significantly improving the intelligent level and reliability of motor stator winding operation and maintenance under frequent start-stop conditions.

The invention discloses a grid-forming converter multiple current test system and method, and the system comprises a tested converter, the input side of which is connected to a power grid; the impedance conversion module is connected with the output side of the tested converter and used for changing the impedance of a loop on the output side of the tested converter so that the output current of the tested converter can be switched between the rated current and the n-time current of the rated current, and n is larger than 1; the electric stress acquisition module is connected to the tested converter and is used for acquiring an electric stress parameter when the tested converter works; and the upper computer is connected with the electric stress acquisition module and the tested converter and is used for regulating and controlling the operation of the tested converter and monitoring and recording the electric stress parameters of the tested converter. The system can effectively test the hardware stress of the multiple current of the grid-forming converter under the condition that the power grid capacity is limited, so that the electric stress condition of the converter under the multiple current is evaluated, the implementation cost is lower, and the efficiency is higher.

The invention relates to the technical field of IGBTs (Insulated Gate Bipolar Translator), in particular to a crimping type IGBT assembly, which comprises a first IGBT module, a second IGBT module and a third IGBT module, the second IGBT module is arranged at the top of the third IGBT module; the first IGBT module is arranged at the top of the second IGBT module; the crimping type IGBT assembly further comprises a first upper horizontal row, a first lower horizontal row and a first vertical row. The crimping type IGBT assembly further comprises a second upper horizontal row, a second lower horizontal row and a second vertical row. By optimizing the IGBT module stacking layout and the copper bar connecting structure, the total distance of current transmission paths from the input interface to the collector electrode of each IGBT module and from the output interface to the emitter electrode of each IGBT module is completely consistent, and the balance of parasitic resistance and parasitic inductance of each branch is ensured; therefore, the problem of current unbalance caused by path difference in an existing parallel structure is effectively solved, the current sharing coefficient is stabilized at a high level, and thermal breakdown or electric stress damage caused by long-term overload of a single IGBT module is avoided.

The invention provides a high-energy acoustoelectric physical field fracturing and permeability increasing experiment system and method. The experiment system comprises an anti-explosion and anti-explosion cavity, and a test loading system, an acoustoelectric fracturing system, a gas injection system, an extraction system and a parameter monitoring system which are mounted in the anti-explosion and anti-explosion cavity. Strong electric stress and shock waves generated by high-voltage discharge and vibration and cavitation effects caused by a high-strength sound field jointly act on a coal sample. Under the action of an electro-acoustic coupling field, microscopic cracks are generated in the coal sample and are expanded into a net, so that the permeability is improved; and meanwhile, physical field energy promotes desorption of gas molecules and accelerates the diffusion process, and finally efficient extraction of unconventional natural gas is achieved. According to the invention, breakthroughs are made in the aspects of fracturing energy, fracturing action range, in-situ observation capability and the like, a simulation experiment of fracturing and permeation enhancement of the deep ultra-low permeability reservoir under the action of a high-energy acoustoelectric physical field is realized, and an experiment platform is provided for research on a permeation enhancement transformation mechanism of the deep ultra-low permeability reservoir.

This invention provides a method for suppressing bubble defects in embedded 3D printing based on microdroplet jetting. The method proposes a novel approach using electric field induction to suppress internal bubble defects in embedded 3D printed parts. When the charge level of the charged microdroplets reaches a critical value, the electrical stress stretches the bottom of the charged microdroplets outwards, causing them to contact the flexible substrate first in the form of a Taylor cone. This fundamentally suppresses air entrapment during the microdroplet embedding process, effectively suppressing internal bubble defects in embedded printed parts. This method is expected to overcome the technical bottleneck of structural forming defects in embedded 3D printing based on microdroplet jetting, providing a feasible technical solution for fabricating high-performance functional devices with complex configurations and multiple material composites.

The invention relates to the technical field of insulation testing of high-voltage variable frequency motors, in particular to a testing structure and method for insulation breakdown or partial discharge of a variable frequency motor, and the structure comprises a hollow metal tube body which is wrapped by an insulating layer for insulation breakdown test or partial discharge test. A coaxial cylinder electrode structure for generating a radial uniform electric field is arranged in the middle of the metal tube body; the insulating layer is positioned on the surface of the coaxial cylinder electrode structure; a winding wire layer is arranged on the outer side of the coaxial cylinder electrode structure, the inner side of the winding wire layer makes contact with the coaxial cylinder electrode structure, and one end of the winding wire layer is led out to serve as an electrode to be connected with an external testing circuit. The two ends of the metal tube body serve as electrodes to be connected with an external test circuit. According to the invention, the electrical stress borne by insulation under the actual operation condition can be effectively simulated, and the comprehensive measurement of the insulation breakdown strength and the partial discharge characteristic can be realized. The structure is reasonable in design and convenient to manufacture, and has good repeatability and adaptability.

The invention provides a curve-based wiring layer GDSII optimization method and system, a medium, a program and an electronic terminal.The method comprises the steps that initial wiring is generated through a Manhattan type global wiring algorithm to serve as a base line, then the initial wiring is compared with a preset wekpoins graphic library to mark a wekpoins area in the initial wiring, only the wekpoins area is traversed, and the initial wiring is subjected to GDSII optimization; and the right-angle configuration blocks are screened out for curve replacement. Therefore, a wekpoins area is reduced under the condition that global curve wiring is not carried out, and a physical design drawing is consistent with a circuit wiring form of actual wafer photoetching; in addition, compromise among sharp corner electric stress weakening, data increment compression, calculation acceleration or template rapid replacement can be achieved by selecting different curve replacement strategies.

The invention discloses a method for evaluating the aging performance of flame-retardant insulating oil, and relates to the technical field of performance evaluation of insulating materials of power equipment, and the method comprises the following steps: S1, sample preparation; s2, a sequential coupling aging test: sequentially performing an accelerated thermal aging test and a disruptive discharge aging test on the flame-retardant insulating oil sample; s3, performance parameter testing and characteristic rule identification: testing a flash point, a breakdown voltage, a dielectric loss factor tan delta and an acid value of the sample at different stages of the sequential coupling aging test; analyzing an evolution rule of a flash point along with thermal aging time, change characteristics of a breakdown voltage in thermal aging and breakdown discharge aging processes, and change trends of a dielectric loss factor and an acid value; and S4, comprehensive performance and service life evaluation. According to the invention, through a sequential coupling aging test, a complex working condition of a thermal-electric stress synergistic effect in the transformer is comprehensively simulated, and the limitation of a traditional single aging mode is overcome.

An ESD circuit includes an ESD clamp device with an ESD clamp transistor. The ESD clamp transistor has two sets of one or more body contacts. One set is coupled to a supply voltage rail and the other set is coupled to a clamp activation circuit. The clamp activation circuit is coupled to a clamp device. During an electrical stress event of a sufficient severity affecting a supply voltage rail, the activation circuit makes the clamp device conductive to transfer charge between supply voltage rails.

The invention relates to an apparatus for protecting over-electric stress and a method of controlling the same. An apparatus for protecting over-electric stress (EOS) includes: a discharge module configured to discharge the EOS when a predetermined threshold voltage is sensed; and a controller configured to control the discharge module, in which the controller includes: at least one sensing module configured to sense the predetermined threshold voltage; and a feedback module configured to increase a response time of the discharge module when the predetermined threshold voltage is sensed.

The composite electric stress control tape is mainly composed of a backing layer and an adhesive layer, wherein the backing layer is a plasticized PVC film layer; the raw material components of the adhesive layer mainly include base rubber, dielectric filler, conductive filler, plasticizer, tackifier, reinforcing filler and antioxidant. The composite electric stress control tape has excellent mechanical and electrical properties, thereby ensuring the integrity, stability and reliability of the product during long-term use.

The invention discloses a converter transient voltage active support method based on a protection demand, and belongs to the technical field of power electronics, and the method comprises the steps: obtaining an instantaneous electric stress parameter of a converter, and obtaining a real-time thermal stress state in combination with a thermal response relation of a power semiconductor device; fusing the electric stress parameter and the thermal stress state, and combining the characteristic data of the safe working area to generate a dynamic safe working boundary; meanwhile, transient information of the power grid is detected, and an ideal transient supporting instruction is generated according to the supporting guide rule; and according to the boundary, constraining and reconstructing the instruction, and generating an adaptive transient support instruction by intelligently adjusting the amplitude or change rate of the instruction. According to the method, the electric thermal stress state of the power semiconductor device is sensed in real time to dynamically generate the safe working boundary, intelligent constraint and reconstruction are carried out on the ideal supporting instruction following the power grid guide rule according to the boundary, and the operation safety and reliability of equipment can be ensured while the transient supporting capacity of the converter can be exerted to the maximum extent.