359results about "Capacitor testing" patented technology

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The invention discloses a capacitor multi-stage adaptive flexible aging test method and system, and belongs to the technical field of industrial process advanced control. According to the method, voltage, current and temperature response data in the aging process of the capacitor are collected in real time by defining charging and discharging time sequences and initial parameters of four stages of preheating, constant current, constant voltage and resting; and comparing real-time data based on a preset model (an internal resistance change rate model and a temperature rise curve model), and dynamically adjusting power supply parameters in the next stage or triggering a protection mechanism. According to the method, the overstress or understress problem of a traditional fixed parameter test is solved, intelligent and personalized control of the aging process is realized, the test accuracy and the capacitor reliability are improved, and the method is suitable for aging test scenes of various capacitors.

The invention provides an MLCC short-circuit product defect position analysis method, and belongs to the technical field of multilayer ceramic capacitor failure analysis. The method comprises the following steps: carrying out rapid leakage current detection on MLCC products for 0.5-2 seconds, and screening out short-circuit products of which the leakage current is greater than a first preset threshold value; products with crack defects are eliminated through an acoustic scanning microscope; gradually applying increased direct-current voltage to the screened crack-free short-circuit product, monitoring leakage current in real time, and terminating the test when the sudden change amplitude of the current exceeds a second preset threshold value; then acoustic scanning is carried out on the protective cover surface and the cutting surface, and two-dimensional coordinates of defect points on the two surfaces are extracted; and calculating the three-dimensional coordinates of the defect in the MLCC through image registration and a spatial inversion algorithm. According to the method, the internal hidden short circuit defect can be identified and positioned in a non-destructive manner, the positioning precision and the analysis efficiency are improved, and the method is suitable for batch failure analysis and manufacturing process optimization.

The invention provides a capacitor self-checking circuit, a charge pump system and a self-checking method. The capacitor self-checking circuit is characterized in that the output end of a charge pump unit is connected with an upper pole plate of a second capacitor through a current source and a first mode switching switch in sequence; the first resistor and the second mode change-over switch are connected in series between the upper pole plate and the lower pole plate of the first capacitor; the second resistor and the third mode change-over switch are connected in series between the upper pole plate of the first capacitor and the ground; the third resistor and the fourth mode change-over switch are connected in series between the upper pole plate of the second capacitor and the ground; the first comparator is connected with the upper and lower polar plates of the first capacitor and outputs a first detection result; and the second comparator is connected with the upper and lower polar plates of the second capacitor and outputs a second detection result. According to the capacitance self-checking circuit and method of the charge pump, detection items are more comprehensive, the detection time is short, the efficiency is high, the power consumption is low, and the cost is low; after the detection is completed, the system can be started immediately without an additional pre-charging link.

An electric leakage protection system includes: a first Y capacitor and a second Y capacitor connected in series; a power battery, wherein a positive electrode of the power battery is connected to a first end of the first Y capacitor and the second Y capacitor which are connected in series, and a second end of the first Y capacitor and the second Y capacitor which are connected in series is separately connected to a negative electrode of the power battery and a negative electrode of a DC charging port; and a controller configured to: when acquired electric leakage-related parameters meet preset electric leakage protection conditions, control an energy leakage loop to avoid an electric shock.

Embodiments herein provide a monitoring module (100) and method for generating a signal indicative of performance degradation of a capacitor (105) in an HVDC power converter (107). The method comprises sampling input load signals of the capacitor using a measurement circuit (101). The method further comprises calculating a capacitance value of the capacitor using small signal analysis in the frequency domain using a frequency domain unit (102) and the measured input load signals. The method further comprises calculating a power loss factor of the capacitor using small signal analysis in the time domain on the measured input load signals using a time domain unit (103). The method further comprises generating a signal indicative of performance degradation of the capacitor based on the calculated capacitance value and the calculated power loss factor using a warning unit (104).

A method for detecting an abnormal cell in an energy storage system with a plurality of energy storage cells connected in series and operatively coupled to a storage management system. The storage management system performs the following steps: a) for each energy storage cell, obtaining cell data indicative of a cell leakage current level of the respective energy storage cell, the cell data at least including balancing-on-time; b) for each energy storage cell, determining a cell leakage level based on the balancing-on-time (BOT); and for each energy storage cell, determining the energy storage cell to be an abnormal cell, when the cell leakage level resulting from step b) exceeds a predetermined threshold.

The utility model discloses a capacitor service life test clamp, and relates to the technical field of capacitor detection, the capacitor service life test clamp comprises a clamping box with one end provided with an opening, a clamping structure is arranged in the clamping box, and four corners of the upper and lower surfaces of the clamping box are fixedly connected with connecting rods. Through cooperative arrangement of the clamping box, the first clamping hole, the clamping plate, the second clamping hole, a spring and other structures, during use, the clamping plate is pushed to enable the first clamping hole and the second clamping hole to be aligned, the middle section of the capacitor penetrates through the first clamping hole and the second clamping hole, the clamping plate is loosened, the clamping plate moves under the action of the elastic force of the spring, and the capacitor is clamped. The inner walls of the first clamping hole and the second clamping hole clamp the capacitor from the two sides, the end of the capacitor is not subjected to clamping acting force, and it is avoided as much as possible that when a traditional test clamp fixes the capacitor, certain pressure is applied to the two ends of the capacitor, oxidation or falling off of a tin coating at the end of the capacitor is likely to be accelerated, weldability of the capacitor is reduced, and the service life of the capacitor is prolonged. And the reliability of the capacitor is influenced.

A system and a method for supercapacitor state-of-health (SoH) estimation. The system includes: a data detector that monitors charge-discharge data of a supercapacitor mounted in a vehicle; a vehicle controller including a data construction unit that constructs a time series data matrix for each charge / discharge cycle of the supercapacitor based on the charge-discharge data monitored by the data detector, and a neural network model that estimates SoH of the supercapacitor using the time series data matrix for each charge-discharge cycle of the supercapacitor output from the data construction unit; and a display device that displays an estimation result for the SoH of the supercapacitor estimated by the neural network model of the vehicle controller.

In order to improve ultracapacitor energy storage systems, the invention proposes a method for detecting an abnormal cell (26) in an energy storage system (10), the energy storage system (10) comprising a plurality of energy storage cells (18) that are connected in series and operatively coupled to a storage management system, the storage management system performing the steps of: a) for each energy storage cell (18), obtaining cell data that are indicative of a cell leakage current level of the respective energy storage cell (18), the cell data at least including balancing-on-time; b) for each energy storage cell (18), determining a cell leakage level based on the balancing-on-time (BOT); and c) for each energy storage cell (18), determining the energy storage cell (18) to be an abnormal cell (26), if the cell leakage level resulting from step b) exceeds a predetermined threshold.

The invention relates to the technical field of all-condition equivalent testing of flexible direct current capacitors, and discloses an all-condition equivalent testing method and system for a flexible direct current capacitor. The preset working condition voltage is adjusted according to the waveform consistency judgment result of the sample so as to equivalently simulate the alternating-current and direct-current superposed voltage and pulse power characteristics in actual operation; and collecting the surface temperature and leakage current of the sample, and finally generating an electric heating performance parameter curve through comparison and judgment with a preset threshold value. By dynamically adjusting the working condition voltage and strictly monitoring the waveform consistency, the pulse power intensity of large-current charging and discharging of the capacitor in each working period in actual operation is effectively reproduced, and the performance change under the real operation working condition is comprehensively reflected by combining environmental parameter simulation and real-time monitoring of temperature and current. The technical problems that in the prior art, the pulse power intensity of the capacitor in the continuous charging and discharging process along with large current in each work period during operation is difficult to reflect, and the real operation condition cannot be comprehensively reflected are solved.

The invention relates to the technical field of capacitor aging screening, in particular to an aging device of a capacitor for a new energy automobile, which comprises an aging box body and a bearing assembly arranged in the aging box body, an elastic clamping assembly is arranged in the columnar part and comprises an annular elastic film and a closed air chamber, the annular elastic film wraps the inner wall of the columnar part, low expansion sections and high expansion sections are alternately arranged in the circumferential direction of the annular elastic film, and the closed air chamber is formed between the annular elastic film and the inner wall of the columnar part. And gas which can expand after being heated is filled inside. The low expansion sections and the high expansion sections of the elastic material sections with different expansion coefficients are alternately arranged, and a uniform waveform contact surface is formed in the thermal expansion process, so that the wrinkle problem of a traditional elastic layer is effectively eliminated, the circumferential stress uniformity of the capacitor is improved, and the deformation of the shell is avoided; and the closed air chamber and thermal expansion cooperate with each other, so that the clamping force is automatically enhanced when the temperature rises.

The invention provides a detection system and a detection method for an exhaust fault of a super capacitor, and a vehicle. The detection system comprises a detection unit which comprises a pressure sensor, and the pressure sensor is configured to detect the pressure of the super capacitor; a determination unit configured to determine whether the pressure sensor is normal and whether the detected pressure exceeds a first threshold for a first time; and the execution unit is configured to respond to the situation that the pressure sensor is normal and the detected pressure exceeds a first threshold value for a first time, determine that the super capacitor has an exhaust fault and provide an alarm signal. According to the invention, the pressure change in the super capacitor is detected in real time through the pressure sensor, and the abnormal change of the pressure can be monitored at the initial stage of a fault, so that problems can be found as soon as possible, and more serious faults or damages can be avoided.

The invention discloses a capacitor capacitance value on-line monitoring alarm method and system, and the method comprises the steps: periodically obtaining the real-time current data of a capacitor according to a set collection period, and calculating a normal range of a three-phase current ratio based on a current ratio algorithm in combination with the number of series connection and parallel connection of capacitor units in the capacitor; calculating the current three-phase current ratio according to the actually collected current data, comparing the current three-phase current ratio with the normal range, and if the current three-phase current ratio exceeds the normal range, determining that the state of the capacitor is abnormal; when it is detected that the state of the capacitor is abnormal, a real-time alarm mechanism is triggered immediately, the established alarm rule base is called to generate detailed alarm information, and the detailed alarm information is sent to a user terminal in multiple modes. Compared with the prior art, the method breaks through the limitation of a fixed period, improves the monitoring accuracy, achieves the precise alarm, and facilitates the quick processing of a fault for a user.

The invention discloses a bus capacitor service life prediction method, power supply equipment, electronic equipment and a storage medium. The bus capacitor service life prediction method comprises the following steps: determining a maximum voltage fluctuation difference value and average output power of a bus voltage corresponding to a bus capacitor in a ripple period; determining the capacitance value of the bus capacitor based on the maximum voltage fluctuation difference value and the average output power; and determining a service life prediction value of the bus capacitor through a plurality of capacitor capacitance values obtained through detection in a plurality of ripple periods. The capacitance value of the bus capacitor is calculated based on the maximum voltage fluctuation difference value and the average output power, the detection difficulty can be reduced, the detection real-time performance can be improved, the service life prediction value of the bus capacitor is determined through the multiple capacitance values obtained through detection in the multiple ripple periods, accidental error interference can be reduced, and the service life prediction accuracy of the bus capacitor is improved. Therefore, the detection accuracy is improved and the prediction precision of the service life of the bus capacitor is improved.

The invention is for improved regulation of a switching device (2) of an inverter (1) with a filter circuit (3) and a mains relay (4), wherein the filter circuit (3) is composed of at least one filter inductance (LF) arranged in a conductor (P1, P2, P3, P4) and at least one filter capacitance (CF) connecting two conductors (P1, P2, P3, P4) to one another and for the filter circuit (3) an equivalent circuit (15) composed of an effective filter inductance (LF m ) and an effective filter capacitance (CF m ) is used, which effective filter inductance results from at least one filter inductance (LF) of the filter circuit (3) and the topology of the filter circuit (3), and which effective filter capacitance results from at least one filter capacitance (CF) of the filter circuit (3) and the topology of the filter circuit (3), wherein the effective filter inductance (LF m ) and the effective filter capacitance (CF m ) are used as object parameters. In order to determine the object parameters, a voltage pulse is applied between a first conductor output (W1, W2, W3, W4) and a second conductor output (W1, W2, W3, W4) when the mains relay (4) is open; the first conductor output (W1, W2, W3, W4) and the second conductor output (W1, W2, W3, W4) are connected by the switching device (2) to form a closed oscillation circuit (8, 8', 8"), which oscillation circuit extends from the first conductor output (W1, W2, W3, W4) and the first conductor (P1, P2, P3, P4) connected to the first conductor output (W1, W2, W3, W4) via the filter circuit (3) and the second conductor (P1, P2, P3, P4) to the second conductor output (W1, W2, W3, W4) connected to the second conductor (P1, P2, P3, P4); the current and / or voltage change curve (11, 12) in the oscillation circuit (8, 8', 8") is used to determine the current values of the effective filter inductance (LF m ) and the effective filter capacitance (CF m ) as object parameters, with which current values the switching device is regulated.

To provide an apparatus for detecting a stacking direction of internal electrodes of a multilayer capacitor and a detecting method thereof.SOLUTION: An apparatus for detecting a stacking direction of internal electrodes of a multilayer capacitor 100 includes a capacitor moving unit 1 having a supply unit 2 to which a plurality of multilayer capacitors are continuously supplied and moving the supplied multilayer capacitors in one direction, a sensor unit 10 including a coil, installed on the capacitor moving unit, and detecting inductance of the coil when each of the multilayer capacitors approaches the coil to determine a stacking direction of internal electrodes of the multilayer capacitor based on the detected inductance of the coil, and a separating unit 5 installed on the capacitor moving unit and separating a multilayer capacitor 100' selected as an unsuitable multilayer capacitor by the sensor unit.SELECTED DRAWING: Figure 3

The invention discloses an electrolytic capacitor polarity detection circuit, a detection method and a detection device. The detection circuit comprises a test interface used for connecting an electrolytic capacitor; the voltage division circuit is used for outputting sampling voltage; the voltage comparison circuit is used for comparing the sampling voltage with the reference voltage; the isolation circuit is used for outputting a level signal according to the comparison result; the judgment unit is used for judging whether the polarity of the electrolytic capacitor is reversed according to the level signal. The sampling voltage is compared with the reference voltage through the voltage comparison circuit; and meanwhile, the isolation circuit is arranged to realize electrical isolation, the circuit is protected, and a level signal is converted through the isolation circuit and transmitted to the judgment unit. The judgment unit judges whether the polarity of the electrolytic capacitor is reverse according to the level signal. Through the design, the problem of reverse connection of the electrolytic capacitor of the electric meter can be quickly identified in the production stage, and abnormal electric meters are screened out; the detection efficiency is high, the quality of outgoing products is improved, and the failure rate of the electric meter is remarkably reduced.

Disclosed techniques relate to a system for testing a capacitor. An example system includes an inverter to convert DC power from a battery to AC power to drive a motor. The inverter includes a noise filter including a first capacitor connected in series with a second capacitor and a testing circuit configured to test one or more of the first capacitor or the second capacitor. The testing circuit includes a voltage divider including resistors; a voltage detector configured to measure a voltage at the voltage divider; a switch configured to connect the noise filter to the voltage divider; and one or more controllers configured to control an operation of the switch to connect the noise filter to the voltage divider, and to determine, from an output of the voltage detector, whether one or more of the first capacitor or the second capacitor are connected to the noise filter.

The subject of the invention is capacitor health diagnosis. A capacitor health diagnostic circuit is provided that is configured to run a diagnostic test to determine a capacity of the at least one snubber capacitor. The diagnostic test includes a multi-stage discharge test performed under varying current conditions to determine a leakage current of the at least one capacitor and determine a capacitance of the at least one capacitor based at least in part on the determined leakage current.

A method includes connecting an output of a switched capacitor converter to a battery, the switched capacitor converter comprising a first switch, a second switch, a third switch and an upper circuit connected in series, and a flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the upper circuit, in a first short circuit testing step, determining whether the third switch is shorted by comparing a voltage on the common node of the third switch and the upper circuit with a first predetermined voltage reference, and in a second short circuit testing step, determining whether the first switch and the second switch are shorted by comparing a voltage on the common node of the first switch and the second switch with a second predetermined voltage reference and a third predetermined voltage reference, respectively.

The application discloses a performance evaluation method for an internal insulating medium of an oil-immersed capacitor based on a RBF neural network, and the method comprises the following steps: measuring characteristic variables of the internal insulating medium of the oil-immersed capacitor to construct training samples; constructing a RBF neural network model; optimizing initial weights and thresholds of the RBF neural network model; iteratively training the RBF neural network model by using the training samples to obtain a trained RBF neural network model; and evaluating the performance of the RBF neural network model by using the trained RBF neural network model.

The invention relates to the technical field of device testing, and discloses a vehicle super capacitor testing system, a testing method thereof and a storage medium. The super capacitor is connected with the upper computer, the storage battery and the door lock motor are connected with the super capacitor, and the storage battery is used for supplying power to the super capacitor; the acquisition device is used for acquiring a first current value and / or a first voltage value between the super capacitor and the door lock motor; wherein the upper computer is used for sending collision information to the super capacitor, controlling connection and disconnection between the storage battery and the super capacitor, and obtaining a test result according to the first current value and / or the first voltage value. Therefore, by arranging the door lock motor and sending the collision signal to the super capacitor through the upper computer, the actual collision scene can be simulated, and then the accuracy of the super capacitor test result is improved.

The application provides a frequency converter, a control method and device thereof, a motor, a power utilization equipment and a storage medium. The control method of the frequency converter comprises the following steps: determining the power-off duration of the frequency converter based on the Nth time that the frequency converter enters a power-off state; and controlling the frequency converter to work according to the comparison result of the ratio of the power-off duration and a preset duration and a preset threshold, wherein N is a positive integer greater than or equal to 2. The control method of the frequency converter provided by the application determines the power-off duration of the frequency converter when the frequency converter does not enter the power-off state for the first time, and then controls the frequency converter to work according to the comparison result of the ratio of the power-off duration and a preset duration and a preset threshold. In this way, the capacitance value decay degree of the bus capacitor in the frequency converter is monitored based on the power-off duration of the frequency converter, the convenience, timeliness and accuracy of monitoring the capacitance value decay degree of the bus capacitor are ensured, and the use safety and reliability of the frequency converter and the corresponding power utilization equipment are improved.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

A method comprises discharging electrical energy from an intermediate circuit comprised in the apparatus, measuring a direct current voltage, and inputting measured values to a parameter estimator for the intermediate circuit. The parameter estimator comprises at least a first parameter and a second parameter whose values are determined based on an equivalent capacitance value of the intermediate circuit, an equivalent resistance value of the intermediate circuit and an electrical load power value of the intermediate circuit, the parameter estimator outputting values for time constant and values for power-to-capacitance ratio of the intermediate circuit. The method further comprises storing values at least temporarily for condition monitoring.

A supercapacitor module is provided. In some implementations, the supercapacitor module may include a first supercapacitor having a first parameter value for a capacitor parameter in a first test condition. The supercapacitor module may include a second supercapacitor having a second parameter value for the capacitor parameter in about the first test condition. A ratio of the second parameter value to the first parameter value may be from about 0.8 to about 1.2. The supercapacitor module may prevent overvoltages across the first and second supercapacitors, such that the supercapacitor module may satisfactorily operate without a balancing circuit.

The invention provides a super capacitor failure early warning method and system, and relates to the technical field of failure early warning, and the method comprises the core steps: analyzing the overload condition of a vehicle based on a rolling time window, giving a label, associating reference monthly attenuation rates under different condition labels, introducing an individualized correction mechanism to a target vehicle, and carrying out the early warning of the failure of the super capacitor. And an accurate capacity attenuation curve is generated, and residual effective life prediction and multi-stage early warning are realized. The method has the advantages that the limitation that traditional static threshold early warning cannot adapt to a dynamic driving scene is overcome, actual factors such as regenerative braking frequency, charging and discharging intensity and working condition fluctuation are fully considered, and the timeliness and accuracy of early warning are remarkably improved; and through combination of knowledge base construction and individualized correction, the prediction model can be dynamically adjusted according to the use modes of different vehicles, and the adaptability and robustness of the early warning system are effectively promoted.

The invention relates to a method which allows for nuclear magnetic resonance measurements to be carried out on electrical components such as batteries or capacitors. In the process, the component is directly integrated in a resonant circuit (7) of a nuclear magnetic resonance probe head (5) in that the poles (13, 14) are electrically connected to the other elements of the resonant circuit (7), and the probe head (5) is then introduced in a temporally and spatially constant magnetic field (3). Pulsed nuclear magnetic resonance measurements are carried out, in which a spin resonance signal (25) is generated by at least one high-frequency pulse (24) and is recorded. The spectrum (26, 28, 29, 30, 33, 34, 37, 38) formed from this spin resonance signal (25) is dependent on the state of the component (11), in particular on the state of charge of a battery or on the general state of the battery or the capacitor.

To provide a self-diagnosis method and apparatus for an AC filter capacitor of an auxiliary inverter.SOLUTION: The method comprises: acquiring equivalent resistance, inductance and capacitance values of each circuit in the auxiliary inverter; based on the equivalent resistance, inductance and capacitance values of each circuit, establishing a system of equations according to circuit conditions; solving the system of equations to obtain the resistance of each phase circuit, the inductance values of inductive elements in each phase circuit, and the capacitance values of capacitive elements in each phase circuit; comparing these values with corresponding reference values; and, if differences between the corresponding reference values and the resistance, the inductance values of the inductive elements and the capacitance values of the capacitive elements in each phase circuit in any phase circuit are all within their corresponding thresholds, then determining that the auxiliary inverter is not degraded, or otherwise determining that the auxiliary inverter is degraded.SELECTED DRAWING: Figure 2