2057results about "Environmental/reliability tests" patented technology

An apparatus is described for burn-in and/or functional testing of microelectronic circuits of unsingulated wafers. A large number of power, ground, and signal connections can be made to a large number of contacts on a wafer. The apparatus has a cartridge that allows for fanning-in of electric paths. A distribution board has a plurality of interfaces that are strategically positioned to provide a dense configuration. The interfaces are connected through flexible attachments to an array of first connector modules. Each one of the first connector modules can be independently connected to a respective one of a plurality of second connector modules, thereby reducing stresses on a frame of the apparatus. Further features include for example a piston that allows for tight control of forces exerted by terminals onto contacts of a wafer.

A temperature of an electrolytic capacitor 24 incorporated in equipment is detected, a remaining lifetime in actual use is calculated based on a temperature-lifetime law, and the remaining lifetime is indicated. A thin film tape 23 is wound around a temperature sensor 22 for insulation, and the electrolytic capacitor 24 and the temperature sensor 22 are accommodated in a heat-shrinkable tube 25, the secondary temperature sensor 22 is brought into tight contact with the primary electrolytic capacitor 24.

The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.

Systems and methods for determining self-discharge currents in an energy storage cell and detecting internal shorts are disclosed. A system includes a DC voltage source configured to provide a constant test voltage selected to be less than an open-circuit voltage of an energy storage cell to the energy storage cell. The system also includes a current measuring device operably coupled between the DC voltage source and the energy storage cell, and control circuitry operably coupled to the current measuring device. A method includes applying the constant test voltage, and measuring the test current flowing between the DC voltage source and the energy storage cell until after the test current switches from a negative current to a positive current. The method also includes determining a self-discharge current of the energy storage cell by analyzing the measured test current with computational models that capture physical processes tied to the test methods.

The invention relates to a direct-current charging pile detection system comprising a direct-current simulator, a simulation charging process testing load, a charging pile on-load capacity testing load, a simulated power source, an oscillograph and a signal gating device. The direct-current simulator consists of an analog-digital converter, a digital circuit processing module and a detection system interface matching a tested direct-current charging pile interface. According to the invention, the input and output current and voltage signals can be detected and analyzed; and the charge controlcompatibility detection of the charging pile body and charging communication compatibility detection can be realized. The control compatibility tests include a pile body control guidance parameter test, a normal charging process test, and a simulated storage battery fault test; and the communication compatibility test includes communication testing of a direct-current charging pile handshake stage, a configuration stage, a charging stage, and an ending stage. The direct-current charging pile performance indexes can be detected comprehensively and thus the direct-current charging pile can workreliably.

The invention discloses a multiple state variable prediction-based voltage transformer state assessment method comprising the following processes: main fault state variables of a voltage transformer are chosen; the chosen main fault state variables of the voltage transformer are classified into four types: static parameters, dynamic parameters, quasi-dynamic parameters and external parameters; based on the classified main fault state variables of the voltage transformer, a state variable prediction algorithm is adopted for predicting a state of the voltage transformer, and a predicted state value can be obtained; a neural network prediction algorithm is adopted for determining a trend of an operation state of the voltage transformer to be assessed, and a comprehensive assessment result of a voltage transformer state is given based on a real time operation state and a real time trend of the voltage transformer. The method disclosed in the invention is advantageous in that a large amount of state information of the voltage transformer can be subjected to comprehensive analysis, and potential faults of the voltage transformer can be discovered and predicted.

The invention discloses a high-reliability pressure-adjusting automatic testing apparatus for a fingerprint module group. The automatic testing apparatus comprises a pedestal, a left support plate, a right support plate, a horizontal bridge plate, at least one horizontal objective table and a switching board installed on the horizontal objective table. The horizontal bridge plate is fixed between the respective upper ends of the left support plate and the right support plate. At least one lifting plate is arranged between the horizontal bridge plate and the horizontal bridge plate; and an inverted-T-shaped through hole is formed in the upper end of the lifting plate and is formed by a penetrating connecting hole and a rectangular through hole. A hanging plate is installed on the front end surface of the lifting plate; a plastic cavity box is installed at the lower end surface of the hanging plate; and a left cylinder, a right cylinder, and a testing pressing head seta are arranged in the cavity of the plastic cavity box respectively; and a testing pressing head for detecting an electrical performance of the fingerprint module group is fixed at the testing pressing head. According to the invention, the force applied on a product force can be adjusted and controlled; and products for testing are diversified. After testing by multiple times, the testing apparatus with the pressure applying tool can have a stable testing result; and testing results are consistent.

The invention discloses a support vector machine (SVM) based prediction method for the degradation tendency of super-capacitor capacitance value. The prediction method utilizes the regression function of the support vector machine to predict the degradation tendency of the super capacitor capacitance value and comprises: 1) pre-processing the input value and the output value; 2) carrying out trainings to the training set data for a regression estimation function; 3) using the particle swarm optimization algorithm to automatically optimize the relevant parameters of the support vector machine; 4) according to the optimization result, configuring the corresponding parameter values of the support vector machine; substituting the training set data into a correlation vector machine model to obtain a regression prediction model for the degradation tendency of the capacitance value; and 5) substituting the training set data into the regression prediction model to obtain the degradation tendency of the capacitance value. According to the invention, it is possible to conduct online prediction to the degradation tendency of the capacitance value. Through the introduction of a particle swarm optimization algorithm to modify the parameter optimization method, the prediction efficiency and accuracy of the algorithm are increased so that it can be applied in a larger scope.

The invention discloses a method for testing performance of different types of partial discharge detector mainframes based on analog voltage signal injection. A function generator with adjustable output frequency of 0-3.5 GHz and an adjustable output amplitude of 0-10 V is adopted in the method disclosed by the invention, and equivalent analog voltage signals generated by the function generator and based on partial discharge waveforms actually tested by a pulse current partial discharge detection sensor, an ultrasonic partial discharge detection sensor and an ultrahigh frequency partial discharge detection sensor are correspondingly and directly injected into the mainframes of a pulse current partial discharge detector, an ultrasonic partial discharge detector and an ultrahigh frequency partial discharge detector or through DC blocking elements with frequency bands of 10 kHz to 10 MHz. The method disclosed by the invention has the excellent advantages that the testing method is universal and standard, the testing result is reproducible and quantifiable, the range of application of testing objects is wide, the testing contents are comprehensive, and the like.

The invention discloses a car remote control key service life test system. The system is provided with a pedestal and a controller. The pedestal is provided with a clamp used for fixing a car key. A mechanical arm used for pressing a car key button is arranged above the clamp. The mechanical arm is driven by the controller. The mechanical arm is provided with a pressure sensor used for measuring a pressing degree. A pressure sensor outputs a pressure signal to the controller. The system is provided with a key signal receiver used for receiving a key signal. The key signal receiver outputs a receiving signal to the controller. The controller outputs a measurement result to a display. A parameter input port of the controller is connected to input equipment. By using the system, various problems of the car key in a service life field are solved, wherein the problems include high and low temperature endurance tests, a switch endurance test, a cell endurance test and a normal temperature endurance test.

A hand-held apparatus for analysis, testing, inspecting and/or screening a fully integrated and assembled electrically powered assets and devices for measurement of degree of device aging, degradation, condition, and/or Remaining Useful Life (RUL). The device includes an on-board antenna positioned at a distance from the electrically powered device under test and a signal receiver or sensor for examining a signal from the electrically powered device, but especially applied to electronic devices. The receiver or sensor collects unintended and/or intended RF energy components emitted by the electrically powered device and performs the above analysis in a response to the acquired signal input while the electrically powered device is active or powered.

The invention relates to a reliability analysis method in the field of accelerated degradation testing, and in particular to a method based on accelerated degradation electrical parameter for analyzing the reliability of a LED integrated driving power within a LED entire light life cycle based on luminous flux. The method aims at using an electrical parameter to analyze the reliability of the LED integrated driving power so as to obtain the result of influence on the lifecycle of the entire lamp by the driving power. The reliability research for the driving power is based on design perspective. According to the invention, the method aims at addressing the problem of reliability analysis of the integrated driving power within the entire life cycle of the LED lamp, establishes a Wiener-based statistic model in accordance with the accelerated degradation electrical parameter, and conducts model parameter identification in combination with the maximum likelihood method and the MCMC method. The improved identification method reduces sampling requirements with the proviso of better protecting the identification precision by improving the identification method. And eventually, the method can provide a reliability index of the LED integrated driving power within the life cycle of the entire lamp in accordance with the constraints of the life cycle of the entire LED lamp based on luminous flux.

The present invention relates to the technical field of transformer paper oil insulation aging test, especially to a transformer paper oil insulation multi-factor combined aging test device and a lifeprediction method thereof. The device comprises a test box body, a vibration transmission device, test sample clamping devices and an oil-way cycle device. The test box body is arranged on a bearingplatform, the test box body is internally provided with the plurality of test sample clamping devices arranged in parallel, the test sample clamping devices are connected with the vibration transmission device, a vacuum extraction opening, a cycle oil inlet and a cycle oil outlet are processed on the test box body, the cycle oil inlet and the cycle oil outlet on the test box body are connected with an oil-way cycle device through an oil-way cycle pipeline, the vacuum extraction opening on the test box body is provided with a vacuum pump through an exhaustion pipeline, and the extraction pipeline is provided with an exhaust valve. The transformer paper oil insulation multi-factor combined aging test device and the life prediction method thereof can achieve online detection of performance degradation amount of test samples, and employ a random model to combine a traditional life calculation model to predict the life of the transformer.

The invention provides a vacuum environment tester which comprises a vacuum sealing chamber, an experimental device, an experimental platform, a heating assembly and a cooling assembly. The vacuum sealing chamber internally includes an experimental space, the experimental device and the experimental platform are arranged in the vacuum sealing chamber, and the heating assembly and the cooling assembly are arranged on the experimental platform. The cooling assembly comprises a liquid nitrogen cold box, a liquid nitrogen input pipe and a nitrogen output pipe, and a liquid nitrogen volatilizationspace is formed in the liquid nitrogen cold box. The liquid nitrogen input pipe and the nitrogen output pipe are connected with the liquid nitrogen cold box, liquid nitrogen is input to the liquid nitrogen volatilization space via the liquid nitrogen input pipe, volatilized nitrogen is led out of the liquid nitrogen volatilization space via the nitrogen output pipe, and the liquid nitrogen cold box is used to cool a test element. Via technical schemes of the invention, extremely severe temperature change conditions of outer space can be simulated more effectively, and the tested element can betested more comprehensively.

The invention relates to a transformer simulative transportation testbed and application thereof. The transformer simulative transportation testbed comprises a support, a rotary device, a swinging device and a sliding device, wherein the rotary device is mounted on the swinging device, and the swinging device is mounted on the support through the sliding device. When the testbed is used, a transformer is fixedly placed on the rotary device and is driven to rotate by the rotary device, when the swinging device works, the whole rotary device swings to enable the transformer to swing, vertical movement of the transformer can be driven through vertical sliding of the sliding device on the support, and through cooperative working of the rotary device, swinging device and sliding device, various transportation conditions of the transformer in the way of transportation can be simulated. A traditional single mode of simulating transportation conditions of a transformer is changed, various transportation modes in a transportation process of the transformer are simulated to be a whole, and the transportation conditions of the transformer can be truly reflected, thereby providing data reference for design of a transformer, and quality reliability of a transformer product can also be verified.

The invention discloses a secondary equipment risk assessment method. In the method, based on a first-order hidden Markov model, a second-order hidden Markov model is provided and the second-order hidden Markov model is applied to a reliability assessment of secondary equipment, historical running state research to the secondary equipment is increased and considered factors are comprehensive. A method of adopting the second-order hidden Markov model is characterized by firstly, carrying out fault probability calculating on single secondary equipment; and then simulating a failure rate of an investment system of the equipment through Monte Carlo so that an acquired failure rate is reliable. After the secondary equipment is classified, a risk index corresponding to each type of secondary equipment is determined. Therefore, the established risk index accords with characteristics of different types of secondary equipment, and a risk assessment result possesses objectivity and accords with an actual power grid operation condition.

The invention relates to the technical field of switch cabinets and provides a switch cabinet operation monitoring and evaluating system, which comprises an online monitoring module, an operation state evaluating module and a service life predicting module, wherein the online monitoring module is used for online monitoring partial discharge of the switch cabinet and carrying out current and historical query; the operation state evaluating module is used for evaluating the operation state according to the total historical discharge amount of the switch cabinet; the service life predicting module is used for evaluating the service life of the switch cabinet; and the online monitoring module, the operation state evaluating module and the service life predicting module are all connected with a main server. The switch cabinet operation monitoring and evaluating system has the beneficial effects that an ultrahigh frequency antenna is used for acquiring partial discharge signals of the switch cabinet, through filter amplification, recognition conversion and storage, problems of discharge signal attenuation and interference are solved, and accurate online monitoring on the partial discharge of the switch cabinet can be realized; according to the discharge data and the operation state data of the switch cabinet, the switch cabinet evaluation service life under a Weibull distribution model under a statistical characteristics-based fault tree can be obtained; and the system has a reasonable structure, the efficiency is high, and the application prospect is wide.

The invention provides an automatic closed-loop detection method for relay protection. The method comprises: information of a detected relay protection device is obtained, a test item is loaded, and atest plan is generated; whether alternating current and voltage zero drifts and linearity meet the requirements is checked; whether open-in and open-out operations are normal is detected; a GOOSE command is sent and a flexible pressing plate needed by the test item is invested or withdrawn automatically; a fault analog quantity SMV is adjusted automatically to meet the setting requirements of a protection setting value; whether a detected relay protection device acts correctly is determined; a next test item is carried out until all test items are completed; all tests are completed and then atest report is generated automatically. According to the invention, an automatic closed-loop detection method for relay protection is provided to solve problems that the existing on-site relay protection device detection method is not mature, has the low efficiency, and does not meet the field maintenance-free requirement. Therefore, the efficiency, safety, and standardization degree of the relayprotection detection are improved substantially; and the maintenance and operation efficiency and safety of the entire power system are improved.

The invention relates to an over-the-air (OTA) test system for measuring a performance of a device under test (DUT). The test system comprises an over-the-air (OTA) measurement chamber provided with at least one feedthrough for at least a first air hose and a second air hose. The test system further includes a thermally isolated hollow body inside the OTA measurement chamber, in which the DUT is positioned having at least two openings for connecting a first end of each of the first and the second air hose, and at least one sensor having a connection wire, located within the thermally isolated hollow body. Advantageously, the sensor connection wire is fed through one of the two openings into the thermally isolated hollow body.

The invention relates to a portable DC charging pile detection device. The device comprises an interface socket, a load circuit, a CAN bus communication circuit, a power supply module, a connection identification circuit, an MCU, a liquid crystal display module and a keyboard, wherein the liquid crystal display module and the keyboard are connected with the MCU. The interface socket is connected with a charging gun of a charging pile; each part of a device circuit connected with the interface socket identifies reliable connection of an interface through pull-up and pull-down resistors; load resistors are switched through a relay to change load current; the MCU is communicated with a DC charging pile through a CAN bus to control charging, and meanwhile, the MCU is a master control portion of the device and controls each resistor of the device to work normally; and a liquid crystal displayer displays the detection result. The device controls current and voltage output by the charging pile and detects values of the current and voltage output by the charging pile, thereby realizing detection of the charging pile; and the device has the advantages of being small in size and portable.

The invention relates to a composite insulator artificial aging test assessment method based on thermally stimulated current (TSC) characteristics. First peak temperature of a TSC curve of a composite insulator is confirmed to be 300 to 350K; then a correlation coefficient r of aging time and trapped electric charge quantity is calculated, and a maximum trapped electric charge increment [delta]Qmax=30nC is taken as a dividing value for distinguishing effectiveness of an artificial aging test; then a comparative analysis is made, if r<0.6, the effectiveness of the aging test method is poor; if r>=0.6, but the maximum trapped electric charge increment [delta]Qmax<30nC, the aging test method is feasible, but aging time is not enough, so an aging effect is not obvious; and if r>=0.6, and the maximum trapped electric charge increment [delta]Qmax>=30nC, the effectiveness of the aging test method is high. By implementation of the composite insulator artificial aging test assessment method based on TSC characteristics, the composite insulator artificial aging test can be well evaluated, thereby improving the efficiency of composite insulator aging research.