227results about "Continuity testing" patented technology

This invention discloses a highly generalizable method for diagnosing open-circuit faults in multi-transistor converters of motor drive systems. This method addresses open-circuit faults in power devices caused by overcurrent surges, poor heat dissipation, and other factors, preventing damage to the motor and power grid equipment caused by output current distortion and increased torque ripple. The method analyzes the retention characteristics of the positive and negative regions of the three-phase stator current under steady-state operating conditions to construct a fault location function, and combines auxiliary variables to accurately distinguish between single-power and dual-power device open-circuit faults. This invention enables rapid location and accurate identification of complex open-circuit faults such as those in opposite phases on the same side or in opposite phases on opposite sides. It offers advantages such as high diagnostic accuracy, strong ability to distinguish mixed faults, and non-invasiveness, making it suitable for motor drive systems with high requirements for operational reliability and fault tolerance.

The application discloses a kind of three-phase rectifier multiple switch tube open-circuit fault diagnosis methods based on voltage deviation, belong to power electronic converter fault diagnosis technical field.Method includes: obtaining relevant signal for diagnosis;According to three-phase voltage, three-phase current, three-phase inductance value, three-phase equivalent resistance value and switching period, the actual value of three-phase line voltage is calculated;According to DC voltage and the duty cycle of switch tube on three-phase bridge arm, the expected value of three-phase line voltage is calculated;Difference is obtained between the expected value and actual value of three-phase line voltage;The deviation value of three-phase line voltage is compared with first preset threshold and second preset threshold, to determine the polarity of the deviation value of three-phase line voltage;Wherein, first preset threshold is less than second preset threshold;The polarity of the deviation value of three-phase line voltage is combined with voltage phase, to determine fault switch tube.The application can quickly diagnose for various situations of multiple switch tube fault, including single switch fault, two switch tubes in succession fault, two switch tubes simultaneous fault.

The present application relates to the field of rail train traction system circuit fault diagnosis, and discloses a kind of open-circuit fault diagnosis method and system of train traction converter, the method comprises: build orthogonal auto-encoder to construct the association between sensor sampling data Association graph, construct orthogonal projection loss function to guide the encoder to fit out orthogonal mapping, improve the explainability of encoder;Build the association relationship graph optimization model based on nearest neighbor optimization strategy, delete the neighbor node far away to accurately describe the association between data, and prevent model overfitting;Association relationship graph is converted into association relationship matrix, constructs graph convolution network, uses association relationship matrix in network forward propagation, trains graph convolution network, and carries out fault diagnosis based on the network after training is completed. Supervised association relationship graph construction can be realized, and the fault diagnosis accuracy of traction motor is improved.

This utility model relates to a low-cost, high-efficiency network BYPASS continuity testing circuit, including a first interface module and a second interface module. The first interface module is connected to a power module, and the negative terminal of the power module is connected to the first interface module. The second interface module includes an interface LAN2 and eight second signal lines connected to the interface LAN2. Each second signal line is connected to a corresponding light-emitting diode (LED), and the second signal line is connected to the negative terminal of the corresponding LED. The positive terminals of the eight LEDs are all connected to the positive terminal of the power module. When the two ends of the network cable are inserted into the interface LAN1 and the interface LAN2 respectively, if all eight LEDs light up, it indicates that the network BYPASS is normal. If any LED does not light up, then the signal line of the other lit LEDs has an abnormality. This detection circuit is simple, low-cost, and the electronic components are easy to replace, making it highly versatile.

The application discloses a kind of based on multi-sensor information fusion's wire identification and broken wire control method and system, it is related to transmission line identification and broken wire control technical field.The method includes: the two-dimensional image data and three-dimensional point cloud data of operation environment are collected;Multi-sensor fusion model based on space-time registration is constructed, the three-dimensional point cloud data is mapped to the two-dimensional image data, and the three-dimensional space pose of target wire is solved;The end trajectory of mechanical arm is planned based on the three-dimensional space pose, controls cutting execution mechanism to align and clamps target wire;Real-time monitoring the electromechanical state parameter of cutting execution mechanism in cutting process, calculates cutting impedance based on state observer model, according to the change characteristics of cutting impedance, identifies wire fracture critical point, and executes adaptive broken wire control strategy.The application is used to solve the problem of low wire identification accuracy and mechanical arm rebound instability in high tension broken wire instant under complex operation background.

Methods, apparatuses and systems for providing offset calibration and fault monitoring are disclosed herein. An example controller component may comprise: a resistance-based bridge circuit; a signal conditioning circuit configured to condition an output of the resistance-based bridge circuit; a first diagnostic circuit coupled to the signal conditioning circuit configured to monitor an output of a first branch of the resistance-based bridge circuit; and a second diagnostic circuit coupled to the signal conditioning circuit configured to monitor an output of a second branch of the resistance-based bridge circuit.

The application discloses a kind of T type three-level converter open-circuit fault diagnosis method with strong robustness, belong to the field of power electronic equipment fault diagnosis, to distinguish different switch similar open-circuit fault characteristics and accurately locate open-circuit fault tube.Considering different modulation strategies and modulation modes, the phase voltage residual is generated through the phase voltage model, so as to extract the fault characteristics of the converter under various open-circuit faults.Analyze the influence of factors such as parameter error, dead time and delay time of the system on the phase voltage vector residual, and the adaptive residual vector amplitude threshold based on uncertainty propagation theory.A hierarchical fault diagnosis scheme is proposed, which can locate the group-level open-circuit fault according to the voltage residual vector amplitude and angle, switch the three-level modulation mode of all phases of the converter to two-level mode, to further identify the specific fault switch from the fault group.A reasonable balance between robustness and speed can be achieved, and the complexity and adaptability of the diagnosis algorithm are fully considered.

The present disclosure provides a method of detecting a fault in a ground cable. The method comprises monitoring the ground cable passing through an equipment of an electric substation, wherein the equipment is connected with the device. Further, detecting the fault in the ground cable based on the monitoring of the ground cable. Moving ahead, upon detecting the fault, the method performs at least one of: generating an alarm in the electric substation and a color-coded signal in a visual indicator, by the device, wherein the visual indicator activates the color-coded signal that indicates the fault on the equipment of the electric substation, based on the fault detected, and transmitting a notification message to a control center.

The present application belongs to the technical field of joint terminal box, and discloses a diagnosis method for the wiring state of a joint terminal box and the joint terminal box, and the specific steps comprise: collecting phase voltage and current signals in situ inside the joint terminal box; performing digital signal processing on the collected signals to extract characteristic quantities, and comparing the extracted characteristic quantities with a preset wiring standard database in real time; determining the wiring state according to the comparison result, and outputting the determination result; cutting off the power supply when the determination result is an open circuit or a short circuit fault; and reading the data of an electric energy meter and checking the data with the collected data in the box. The present application embeds a judgment unit inside the joint terminal box, realizes in-situ collection and processing of voltage and current signals in the joint terminal box, and avoids installation complexity and reliability problems caused by a split structure; the present application extracts multiple characteristic quantities in the joint terminal box, and compares them with a preset wiring standard database, so that more accurate fault positioning is realized.

This system accurately detects damage such as short circuits and partial breaks in power cables that supply power to in-vehicle equipment. [Solution] The vehicle power supply system 100 supplies power from a battery 1 to a plurality of loads 3 mounted on a vehicle via a power cable 2 connected to the loads 3. The vehicle power supply system 100 includes an oscillator 6 that outputs an AC signal at a predetermined frequency, a capacitor 8 as a superimposer that superimposes the AC signal on point A, which is one end of the power cable 2, a resistor 7 as a detector that detects the voltage of the power cable 2 when the AC signal is superimposed on point A of the power cable 2 via the capacitor 8, and a diagnostic unit 10 that diagnoses whether or not there is an abnormality in the power cable 2 based on the voltage vo detected by the resistor 7.

The application discloses a photovoltaic panel parallel fault detection circuit and method, which is electrically connected with N photovoltaic panels, and comprises N plug-in parts electrically connected with the N photovoltaic panels, wherein the plug-in parts comprise a first port and a second port, the first port is electrically connected with the photovoltaic panel, and N is an integer greater than or equal to 2; a first line connected with a first pin of the second port of the plug-in part and a second line connected with another pin of the second port of the plug-in part; the other end of the first line and the second line is electrically connected with a transformer; and an analog load and a filter capacitor are connected in parallel between the first line and the second line. The beneficial effects are as follows: by arranging independent detection circuits and control switches in the loop of each photovoltaic panel, the detection blind area caused by parallel voltage clamping is overcome, open circuit, reverse connection and leakage current faults of specific photovoltaic panels can be accurately identified and located, and the accuracy and timeliness of system fault diagnosis are improved.

The embodiment of the application discloses a display device detection circuit, a board card and a test equipment. The technical scheme provided by the embodiment of the application can realize the detection of the display interface pins of the display device to be tested by connecting the video signal generating device to the second interface module, connecting the display device to be tested to the first interface module, controlling the switch switching module to connect the fixed connection end and the first movable end by the control module, and detecting the pins of the display device to be tested by the pin detection module, can accurately detect whether the display interface pins of the display device to be tested are short-circuited and / or open-circuited, the pin detection of the display device to be tested does not need to rely on the display picture, reduces the false judgment of the pin fault, and more comprehensively detects the display device to be tested, and effectively improves the display device detection effect.

The application relates to the technical field of semiconductor detection, in particular to a via open defect detection method and system, and aims to solve the problem of how to detect the open defects of redundant vias in a chip. To this end, the application determines an interest region to be detected on the chip, and identifies a pattern region meeting a preset condition in a layout region corresponding to the interest region based on a layout file used when the chip is manufactured. The preset condition is that the pattern region includes at least one group of vias, and in each group of vias, each via is connected to a ground at one end and connected to each other via the same metal trace at the other end. A defect detection region in the interest region on the chip is determined based on the pattern region. The defect detection region is scanned by an electron beam defect detection device to obtain a detection result of the open defects, and the open defects of the redundant vias can be effectively detected.

The battery system includes a battery pack, a first main relay having one end connected to a positive terminal of the battery pack and a second main relay having one end connected to a negative terminal of the battery pack, a first control relay connected between the first main relay and a positive terminal of an inverter and a second control relay connected between the second main relay and a negative terminal of the inverter, a fusion diagnosis circuit including a first resistor and a first photocoupler connected between the positive terminal of the battery pack and the negative terminal of the inverter, and a second resistor and a second photocoupler connected between the negative terminal of the inverter and the negative terminal of the battery pack, and a BMS (Battery Management System) that drives the first and second photocouplers to diagnose fusion of the second control relay.

This invention discloses a method and system for early warning of grounding wire breakage in armored shielded DC cables. The method includes: measuring the grounding current of the shielding layer and the grounding current of the armoring layer at both ends of the armored shielded DC cable; calculating the waveform similarity between the grounding current of the armoring layer and the grounding current of the shielding layer at each end; comprehensively judging whether a grounding wire breakage has occurred at each end based on the current amplitude, waveform similarity, cable operating status, and grounding grid health status; and issuing a corresponding breakage warning signal when a grounding wire breakage occurs. This invention can effectively improve the operation and maintenance level of substation secondary circuits.

The application provides a modular multilevel DC / DC converter switch device open-circuit fault diagnosis method, comprising: collecting each phase output current in the converter; comparing each phase output current in the converter with a preset threshold value in sequence, if the kth phase output current is lower than the threshold value, locking all the fully controlled switch devices of the kth phase and marking the kth phase as a fault phase, calculating the total output current of each phase of the converter, and setting a reference value; if the total output current of each phase reaches the reference value, injecting an optimal switch action sequence into each H-bridge unit in the fault phase kth phase, and outputting a fault positioning result; the application can diagnose and position the open-circuit fault of the switch device of the modular multilevel DC / DC converter on the basis of only relying on the collection of the output current of each phase of the circuit, low sampling frequency and small calculation power.

The application provides a kind of power conductor breakage fault detection equipment and use method, it is related to technical field, through the distributed high-precision acquisition of multimodal sensing module and anti-strong electromagnetic interference, anti-vibration design, combine environmental noise modeling module to utilize machine learning to construct dynamic environmental noise model and generate background interference intensity factor, effectively filter out complex environmental noise, significantly reduce false alarm rate, improve real breakage signal capture ability;The risk assessment unit of system adaptive optimization module associates fault confidence index with background interference intensity factor, fits breakage risk assessment index, realizes adaptive detection sensitivity adjustment based on real-time environmental noise;Strategy optimization unit carries out multistage risk assessment and grading disposal through evaluation threshold interval, shortens fault response time, improves the capture and early warning efficiency of non-completeness or initial weak signal, effectively guarantees the safety of railway power supply system.

A triode array reliability test circuit belongs to the field of transistor testing technology. A triode array reliability test circuit belongs to the field of transistor testing technology. The test circuit comprises an NPN triode, a B electrode voltage reference circuit, a B electrode / voltage source constant current bias circuit, a B electrode anti-reverse breakdown protection circuit, an E electrode constant current bias circuit, an open circuit / poor contact display circuit, a short circuit display circuit and an anti-interference protection circuit. The test circuit has the effects of conducting direct current aging test on the triode with constant dissipation power, monitoring normal test state, monitoring open circuit / poor contact / short circuit abnormal state and preventing aging power fluctuation. The problems of the prior art test circuit, such as inability to judge whether the triode aging power meets the standard, inability to timely screen out triodes with open circuit and short circuit, large direct current aging total current, aging power fluctuation caused by product interferences and the like are solved. The test circuit is widely applied in transistor and transistor array reliability test technology.

The utility model relates to a kind of jigs for semiconductor device detection, including horizontal moving device and detection device;Horizontal moving device includes bottom plate, support seat, tooling bottom plate and drive arrangement;Drive arrangement drives support seat linear motion along the length direction of bottom plate;The top both ends position of support seat is equipped with pin column;Tooling bottom plate is equipped with positioning hole in the position of pin column, and tooling bottom plate is detachably fixed on support seat by the cooperation of pin column and positioning hole;Several placing stations are equipped on tooling bottom plate;Detection device includes portal frame, lifting device and mounting plate;Portal frame is fixed in the one end of bottom plate;Lifting device is set in the top of portal frame, and mounting plate is detachably set on lifting device;Several groups of probes are equipped on mounting plate, and several groups of probes and the placing station on tooling bottom plate are one-to-one corresponding.The utility model changes tooling bottom plate and mounting plate by quick replacement, adapts to the semiconductor device of different structure, and carries out on-off detection to its batch.

A test system comprises a test circuit board, a test device, a lower computer, and an upper computer. The test circuit board includes a test circuit, the test circuit comprising multiple main lines arranged side by side, one end of each of the main lines being used to connect with a positive electrode or a negative electrode of each battery cell of the battery module, and the other end of each of the main lines being connected with a first branch and a second branch. The lower computer controls a first branch connected to one of the main lines to be electrically conductive to a positive electrode of the test device and a second branch connected to another one of the main lines to be electrically conductive to a negative electrode of the test device. The upper computer controls the lower computer and reads parameter information for the test device.

This utility model discloses a device for detecting open circuits and leakage current in a hot runner system. The hot runner system includes several hot runner heaters, each of which integrates an open circuit detection module and a leakage current detection module. The device includes a detection box, with a controller installed inside. The outer surface of the box has a first interface, a second interface, and several LED indicator lights, all electrically connected to the controller. The output terminals of the open circuit detection modules of each hot runner heater are electrically connected to the first interface, and the output terminals of the leakage current detection modules of each hot runner heater are electrically connected to the second interface. This utility model can simultaneously detect open circuits and leakage current in multiple hot runner heaters within a hot runner system, enabling efficient, rapid, and accurate identification of abnormal hot runner heaters, thereby effectively improving the maintenance efficiency of the hot runner system.

A battery management apparatus includes an information obtaining unit configured to obtain an open circuit voltage of a plurality of battery cells and a controller configured to calculate a first voltage of each of the plurality of battery cells, which is related to a change in open circuit voltage of the plurality of battery cells, for a preset time, calculate a second voltage that is an average of the first voltage of each of the plurality of battery cells, calculate a deviation based on a first voltage and a second voltage of each of the plurality of battery cells, and diagnose the plurality of battery cells based on a ratio of the first voltage and the second voltage of each of the plurality of battery cells and the deviation.

The application discloses a kind of monitoring system and method for safety of induced electric high voltage launch, it is related to geophysical exploration instrument technical field, the system includes: data acquisition module, DC relay, control module and monitoring end;Data acquisition module, DC relay and monitoring end are connected with control module;Data acquisition module is used to calculate the ground resistance in the induced electric launch loop of target induced electric transmitter in real time, and the ground resistance of real-time calculation is sent to control module;Control module is used to send the ground resistance received in real time to monitoring end, and when ground resistance is greater than set resistance threshold, the DC bus voltage of target induced electric transmitter is disconnected by controlling DC relay, and open-circuit fault information is sent to monitoring end by wireless communication.The application realizes the real-time safety monitoring of high induced electric transmitter, and improves production safety.

The embodiment of the present application relates to the technical field of vehicles, and discloses a kind of acquisition circuit, gear knob state recognition device, method and vehicle, the acquisition circuit includes: first circuit and acquisition device including variable resistance device;First voltage when variable resistance device is at minimum resistance value and second voltage when maximum resistance value are both constant values;Variable resistance device is physically connected with target button, and the pressing of target button drives the resistance value of variable resistance device to change;Acquisition device is used to collect the voltage of variable resistance device, so as to reflect the pressing state of target button by voltage.The technical scheme of the application can accurately identify the pressing state of the target button through a simple acquisition circuit, thereby improving the reliability and response efficiency of the key state detection.

This invention discloses a method for detecting the electrical condition of a lithium battery pack. When the conduction path between the lithium battery pack and the DC bus is broken, the open-circuit voltage of the lithium battery pack is collected as a voltage reference. The lithium battery pack is then connected to the DC bus through a first and a second conduction path with different equivalent series impedances. When the conduction current in each path reaches the same reference current value, the corresponding first and second terminal voltages of the lithium battery pack are collected. If the difference between the first and second terminal voltages exceeds a first threshold, the impedance abnormality of the lithium battery pack is determined to originate from the conduction path. If the difference between the voltage reference and the second terminal voltage exceeds a second threshold, the impedance abnormality of the lithium battery pack is determined to originate from the cell side. This invention can effectively distinguish the source of lithium battery pack impedance abnormalities, thereby providing targeted detection conclusions for equipment maintenance and safety assessment, and enhancing the practical value of electrical condition detection for outdoor energy storage power supplies.

This utility model discloses a continuity testing device for safety testing equipment, including a testing platform. A testing frame is fixedly connected to the upper surface of the testing platform, a placement plate is fixedly connected to the inner wall of the testing frame, a wire harness connector is fixedly embedded in the inner side wall of the testing frame, and a test display meter is fixedly connected to the inner side wall of the testing frame. The test display meter is electrically connected to the wire harness connector via a wire, and a slide rail groove is formed on the inner wall of the testing frame. This device, through the testing platform, testing frame, placement plate, wire harness connector, and test display meter, can connect and plug into automotive wiring harnesses, perform continuity testing on the wiring harness using the test display meter, and, through the slide rail groove, sliding block, circuit breaker sensor, LED, buzzer alarm, low-volt power supply, 8050 transistor, and sensing copper wire, can form a circuit breaker sensor to detect the location of a circuit break in the automotive wiring harness, facilitating subsequent repair work of the automotive wiring harness.

The utility model discloses a cable fault detector, including box body and the detection appearance host computer of installing in the inside of box body, the box body is hinged with the box cover, be equipped with operating panel and the connecting jack on the detection appearance host computer, the inside of box body is provided with the placing groove, the inside placing of placing groove is equipped with the connecting line, one end of connecting line is equipped with the plug that coordinates with connecting jack. The utility model discloses through setting internal thread sleeve cooperation wire clamp spare use, and wire clamp spare passes through the cooperation of external thread connector and internal thread sleeve, and the firmness of connection is ensured, and the design of elastic sleeve makes two clamp blocks can tightly hold cable inner core wire, avoids the phenomenon of poor contact due to loosening, not only has improved the reliability of equipment, also is convenient to replace the damaged component alone, thereby has reduced maintenance cost, and the whole structure is compact and reasonable, convenient operation greatly improves the efficiency and accuracy of cable fault detection advantage.

This invention proposes a method and system for diagnosing open-circuit faults in three-phase inverter IGBTs, relating to the technical field of power electronic device fault diagnosis. The method involves lightweight processing of acquired historical data to obtain feature vectors; training a pre-defined three-phase inverter IGBT open-circuit fault diagnosis model based on these feature vectors; real-time acquisition of three-phase current data to be processed, followed by bounded normalization to obtain normalized current amplitudes; and generating IGBT open-circuit fault judgment results based on these normalized current amplitudes. Real-time data related to the three-phase inverter IGBT open-circuit fault is collected based on the IGBT open-circuit fault judgment results, and this real-time data is input into the trained three-phase inverter IGBT open-circuit fault diagnosis model to output the three-phase inverter IGBT open-circuit fault diagnosis results. This invention effectively achieves lightweight, efficient, and accurate diagnosis of three-phase inverter IGBT open-circuit faults.