210results 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 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 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.

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.

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 discloses a measuring circuit and a measuring method for a variable capacitor array, and belongs to the technical field of capacitance measuring circuits, the measuring circuit comprises a controller MCU, a DAC chip, a first logic switch, a capacitance sensor array, a second logic switch, an alternating current amplification circuit and an ADC chip, the controller MCU sends a first alternating current signal through the DAC chip, and the first logic switch sends a second alternating current signal through the ADC chip; a first alternating current signal enters the capacitive sensor array after being switched by the first logic switch, is output to the capacitive sensor array after being switched by the second logic switch, and is converted into a second alternating current signal after passing through the capacitive sensor array. The output second alternating current signal is converted into a voltage signal after passing through the alternating current amplification circuit, the voltage signal is sent back to the controller MCU after being subjected to digital-to-analog conversion through the ADC chip, the controller MCU outputs a measured voltage value, and the capacitance value of the capacitive sensor array is obtained according to the measured voltage value. And through the arrangement of the controller MCU and the logic switch, circuit chips are saved, and the manufacturing cost is reduced.

The invention discloses a self-healing parallel capacitor aging test device and method for an AC power system. The method comprises the following steps: S1, preparation before test; s2, carrying out a first-stage aging test; s3, carrying out a charge-discharge cycle test; s4, performing a second-stage aging test; and S5, detecting after the test. According to the self-healing parallel capacitor aging test device and method for the alternating-current power system, automatic control over the whole test process is achieved, it is guaranteed that test conditions meet the national standard requirement, the influence and closing impact on a power grid in the test process are eliminated, the accuracy and reliability of a test result are improved, and the test efficiency is improved. A standardized method is provided for performance evaluation of the capacitor, and the problems that an existing test device is low in integration and automation degree, poor in test precision, large in power grid influence and insufficient in safety protection are solved.

The application discloses a kind of based on DC side pre-charging's MMC submodule capacitor monitoring method, the capacitor monitoring method includes the following steps;All submodule capacitors in bridge arm are discharged to zero voltage;Charging is carried out to each submodule in turn;The time constant of RC charging loop is calculated to obtain submodule capacitor capacity value;Distinguish whether each submodule capacitor capacity value is less than threshold value, decide whether the submodule capacitor needs to be replaced, until the pre-charging and capacitor monitoring of all submodules are completed.The application can carry out submodule capacitor monitoring synchronously in the pre-charging link before MMC is put into use, so as to effectively monitor the state of each submodule capacitor and replace the fault capacitor in time.Compared with conventional capacitor monitoring method, the application does not involve additional measurement circuit, sensor and complex control algorithm, avoids heavy calculation burden, and can reduce the influence of measurement error, improve capacitor monitoring precision.

This system detects short-circuit faults in series-connected capacitors while suppressing increases in circuit size and area. [Solution] The electronic circuit includes a plurality of diode circuits, each including a first circuit containing a plurality of capacitors connected in series, one or more resistors, and one or more diodes connected in series, and a second circuit containing one or more diodes connected in series and connected in antiparallel to the first circuit. One end of one capacitor on one side of the plurality of capacitors is electrically connected to the first terminal, and the other end of one capacitor on the other side of the plurality of capacitors is electrically connected to the second terminal. One or more resistors are electrically connected in parallel to each of the remaining capacitors, excluding one capacitor on the other side of the plurality of capacitors. One end of each of the plurality of diode circuits is electrically connected to one end of each of the plurality of capacitors, and the other end of each of the plurality of diode circuits is electrically connected to the second terminal.

A converter includes at least one switching module with an energy store and semiconductor switches to allow and block current flow through the energy store. A method of operating the converter includes the steps of measuring a voltage present across the energy store and measuring a current flowing through the energy store. A capacitance of the energy store is determined by minimizing an objective function of the voltage, the current, the capacitance and a time over the minimization parameters capacitance and time. There is also described a converter with a converter control that is configured to operate the converter in accordance with the method.

The invention relates to a power converter arrangement having power modules (1, 2, 3) of a power converter and a control device (4) for power modules, an intermediate circuit capacitor arrangement (5) in the intermediate circuit of the power converter and a monitoring device (6, 7, 8, 14) for determining the state of elements of the power converter, in particular for determining the state of the intermediate circuit capacitor arrangement, wherein the monitoring device has a monitoring AC voltage source (6) which can be controlled independently of the intermediate circuit voltage, is electrically conductively connected to the terminals (13, 14) of the intermediate circuit by means of a coupling capacitor (7) and connecting lines (11, 12) and applies a monitoring AC voltage to the intermediate circuit, wherein the following elements are provided for efficient monitoring: a voltage detection device (8a) for detecting the time-dependent monitoring AC voltage created, a current detection device (8b) for detecting a time-dependent monitoring current which is created when the monitoring AC voltage is applied, a voltage threshold detector (8c) for detecting the times of threshold crossings, in particular voltage zero crossings, of the monitoring AC voltage, a current threshold detector (8d) for detecting the times of threshold crossings, in particular current zero crossings, of the monitoring current, and a timing device (9) for determining the phase shift between the monitoring voltage and the monitoring current on the basis of the detected times of the threshold crossings, in particular the zero crossings, of the monitoring voltage and monitoring current, and a processing device (10) which assigns an age state to the determined phase shift on the basis of a comparison with reference values.

The invention discloses a characteristic parameter identification method and device of a capacitor, equipment and a storage medium. The method comprises the following steps: collecting multi-round charging and discharging data of the capacitor; on the basis of first-round charging and discharging data in the multi-round charging and discharging data, parameter initial values and parameter search intervals of first-round charging and discharging are determined, and parameters are characteristic parameters extracted from the charging and discharging data; and utilizing a genetic algorithm and a Kalman filtering algorithm to perform characteristic parameter inversion based on the parameter initial value and the parameter search interval of the first round of charging and discharging and the multi-round charging and discharging data to obtain the characteristic parameters of the capacitor. According to the method, the Kalman filtering algorithm is utilized, the parameter prior dynamic convergence is realized according to the parameter initial value and the parameter search interval of the first round of charging and discharging, so that the characteristic parameters of the capacitor are identified more quickly and accurately, and the health state of the capacitor is determined based on the characteristic parameters of the capacitor. And the identification efficiency and accuracy of the health condition of the capacitor are improved.

An Ising machine system comprises a plurality of capacitors, a plurality of resistors having first and second terminals, wherein each capacitor is electrically connected to the first or second terminal of at least one resistor of the plurality of resistors via each of its positive and negative terminals, a power supply having positive and negative rails, a switching network configured to initialize each of the plurality of capacitors with a positive or negative voltage from the power supply, then disconnect all of the plurality of capacitors from the power supply, allowing the capacitor voltages to float, and at least one voltage measuring device configured to measure a voltage across the positive and negative terminals of a capacitor of the plurality of capacitors. A method of running an Ising machine system is also disclosed.

A capacitance sensing circuit and method uses a current pulse to charge an external capacitor. A first voltage associated with the external capacitor is converted to current to charge an internal capacitor. A second voltage, which is associated with the internal capacitor that corresponds to the first voltage, is compared with an adjustable threshold voltage to generate a toggle signal. The adjustable threshold voltage is changed in response to the toggle signal, which is associated with a capacitance of the external capacitor.

The present application relates to air conditioner detection technical field, propose a kind of air conditioner electrolytic capacitor health on-line detection method and system, the air conditioner electrolytic capacitor health on-line detection method includes collecting the voltage ripple signal of DC-DC step-down converter output in air conditioner, and detects the zero-crossing time of first time through direct current average voltage in a switching cycle, obtains first zero-crossing time;At the switching on starting moment or switching off moment of switching cycle, single sampling is carried out to output voltage ripple signal, and sampling voltage value is obtained;According to the running state of DC-DC step-down converter, it is judged that DC-DC step-down converter is currently in continuous conduction mode or discontinuous conduction mode;Based on the judgment result, corresponding capacitor parameter calculation model is selected, and the capacitance value and equivalent series resistance of output capacitor are calculated;The capacitance value and equivalent series resistance calculated are compared with preset threshold value, and if exceed threshold value, then trigger capacitor health state early warning.

The present invention is directed at a method for evaluating the degradation level of capacitors of a power filter connected to an adjustable speed drive (ASD) or a power converter. The invention is also directed at an adjustable speed drive and a power converter provided for performing the method.

A mechanical switch includes a mechanical contact, and a coil that receives supply of a drive current from a drive power supply and opens or closes the mechanical contact. The drive power supply includes a capacitor, and a switch connected between the capacitor and the coil. The switch is temporarily turned on in order to turn on / off the mechanical switch, and supplies the drive current from the capacitor to the coil. The drive power supply further includes a charging circuit that charges the capacitor in an OFF period of the switch, a detection circuit that detects a charging current and a voltage of the capacitor, and a diagnosis circuit that diagnoses a degradation state of the capacitor from the detected charging current and voltage.

A method of determining a lifetime parameter of a capacitor in a failsafe device includes measuring an amount of energy required to return the failsafe device to a failsafe position, measuring an effective capacitance of the capacitor, and comparing the amount of energy to the effective capacitance to determine the lifetime parameter of the capacitor.

The utility model discloses a capacitor antipole detection device, and belongs to the technical field of capacitor detection. The capacitor antipole detection device comprises a bottom frame, a conveying frame is installed at the top end of the bottom frame, belt rollers are rotationally connected to the two ends of the inner side of the conveying frame, a conveying belt sleeves the outer sides of the pair of belt rollers, a motor is installed on one side of the conveying frame, the output end of the motor is connected with one ends of the belt rollers, and a plurality of capacitor fixing bases are installed outside the conveying belt. A capacitor body is arranged on the inner side of the capacitor fixing base, an anti-pole detection mechanism is installed on the other side of the bottom frame, an alarm mechanism is installed on the other side of the bottom frame, the anti-pole detection mechanism comprises a first fixing plate, one side of the first fixing plate is fixedly connected with the other side of the conveying frame, and a vertical rod is installed at the top end of the first fixing plate. According to the utility model, the non-contact detection can be effectively realized, the pins of the capacitor are prevented from being bent, and the high practical value is realized.

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.

An electronic device is disclosed that includes a display layer, a display driving unit, a sensor layer, a power driving unit, and a stabilization capacitor. The display layer includes a first electrode, a light emitting layer, and a second electrode. The display driving unit drives the display layer. The sensor layer is disposed on the display layer and includes a sensing electrode. The sensor driving unit drives the sensor layer. The power driving unit provides a power supply voltage to the second electrode. The stabilization capacitor controls the power supply voltage. The sensor driving unit operates in a detection mode to sense voltage data obtained by measuring a voltage between the second electrode and the sensing electrode.

A method of monitoring the condition of energy storage device assemblies of a modular multi-level converter (MMC) is described. The MMC comprises a plurality of seriesconnected submodules which may have a full-bridge or half-bridge topology, for example. Each submodule include can energy storage device assembly with one or more individual energy storage devices electrically connected in parallel. The MMC further comprises at least one alternating current AC terminal electrically connectable to an AC power source by means of a pre-charge circuit. During two or more pre-charge processes where the individual energy storage device assemblies of the MMC are initially charged to a rated voltage by an AC pre-charge current supplied to the at least one AC terminal from the AC power source, one or more measurements (e.g., vi) of the direct current DC voltage across each energy storage device assembly are obtained at one or more times (e.g., at time ti) between a start and an end of each pre-charge process. The one or more DC voltage measurements obtained during each pre-charge process are compared to determine the health or condition of each energy storage device assembly of the MMC.