816results about "Voltage dividers" patented technology

The invention relates to the technical field of voltage acquisition, in particular to a battery string voltage acquisition system with a calibration system and a voltage acquisition method. Which comprises a multi-path voltage input end, a voltage signal adjusting end, a voltage follower, an analog-to-digital converter, a main control center and a communication circuit, and is characterized in that the voltage signal adjusting end comprises a dynamic voltage division network, consists of a digital potentiometer and a high-voltage operational amplifier, and dynamically adjusts the voltage division ratio to suppress common-mode voltage; the main control center is integrated with a multi-channel synchronous sampling calibration module and generates a global synchronous signal through the main MCU to control the ADC to perform synchronous acquisition; a temperature compensation module is arranged between the voltage follower and the ADC, and a digital temperature sensor is adopted to correct the gain drift of the operational amplifier in real time; the voltage division ratio of the dynamic voltage division network is dynamically adjusted according to the real-time common-mode voltage and a preset safety threshold value. According to the scheme, dynamic partial pressure adjustment, multi-channel self-calibration, nonlinear temperature compensation and a rapid protection mechanism can be integrated.

The invention discloses a capacitive voltage transformer for a gas insulated substation, which comprises a capacitive voltage divider and an electromagnetic unit, the capacitive voltage divider comprises a high-voltage capacitor C1 and a medium-voltage capacitor, the medium-voltage capacitor comprises a medium-voltage capacitor C21 and an externally connected medium-voltage capacitor C22, and the capacitance of the medium-voltage capacitor C22 is greater than that of the medium-voltage capacitor C21; the electromagnetic unit is connected with the capacitive voltage divider, an intermediate transformer and a compensation reactor are arranged in the electromagnetic unit, a full-shielding high-voltage shielding cover is arranged outside a high-voltage coil of the intermediate transformer, a damper and an overvoltage protector are arranged outside the electromagnetic unit, and the damper and the overvoltage protector are placed in an external junction box. The problem that in the prior art, an extra-high voltage transformer is low in lightning impulse overvoltage tolerance capacity is solved, the impulse overvoltage tolerance capacity is improved, and the breakdown risk is reduced.

Method for estimating the voltage value relating to a live element uses five capacitors, wherein a first capacitor has its first pole connected to said live element; a second capacitor has its first pole connected to said live element; a third capacitor has its first pole connected to the second pole of the first capacitor and its second pole connected to ground; a fourth capacitor has its first pole connected to the second pole of the second capacitor and its second pole connected to the first pole of a fifth capacitor. The voltage value is estimated using: 1) a voltage value relating to a first node positioned along the conducting wire that connects the first capacitor to the third capacitor 2) a voltage value relating to a second node positioned along the conducting wire that connects the fourth capacitor to the fifth capacitor; 3) a capacitance value of the third capacitor; 4) a capacitance value of the fourth capacitor; 5) a capacitance value of the fifth capacitor.

A battery system having a battery pack with a negative pole, a positive pole and a battery cell, a coupling network having a first negative terminal and a first positive terminal, a pack voltage divider, and a coupling voltage divider. The first positive terminal is connectable to the positive pole via a switch. Optionally, the first negative terminal is connectable to the negative pole via a switch. The pack voltage divider includes a two resistors connected between the positive pole and a first reference point. A negative pack measurement resistor and a negative sub-pack measurement resistor are dis-connectable from the negative pole or the first reference point via a switch. A positive coupling measurement resistor and a positive sub-coupling measurement resistor are connected between the first positive terminal and the first reference point. Two resistors are connected between the first negative terminal and the first reference point.

The invention discloses a flexible DC converter valve DC support capacitor temperature on-line monitoring method and system. The method comprises the steps of obtaining operation data of a thermistor arranged on a target capacitor wiring terminal; processing the operation data to obtain external temperature data of the target capacitor; constructing a thermal network model of the target capacitor based on the structure data and the material data of the target capacitor; performing optimization processing on the thermal network model through internal temperature data of the target capacitor acquired by the thermocouple to obtain an equivalent thermal resistance and thermal capacitance network model; inputting the obtained real-time current data of the target capacitor into the equivalent thermal resistance and thermal capacitance network model for processing to obtain internal temperature rise data of the target capacitor; and fusing the external temperature data and the internal temperature rise data to realize real-time monitoring of the temperature of the target capacitor according to a fused result. According to the method provided by the invention, real-time monitoring and accurate evaluation of the temperature of the capacitor are realized.

A method and a system for estimating the value of the voltage relating to an element under voltage ET. The system comprises alive element ET, a first capacitor C1.sx, a second capacitor 01.dx, a third capacitor 02.sx, a fourth capacitor 02.dx, a fifth capacitor CS.dx. The method involves the use of the electrical values obtained through this system.

A first insulation resistance monitoring circuit includes a first resistor connected between a positive terminal of a battery pack and a node, and connected between the positive terminal of the battery pack and a ground terminal of an external device, and has a first monitoring terminal. A second insulation resistance monitoring circuit is connected between the ground terminal and the negative terminal of the battery pack, and has a second monitoring terminal. A voltage monitoring circuit is connected between the node and the negative terminal of the battery pack, and has a third monitoring terminal. A processor measures the voltage of the battery pack.

The invention discloses an insulator-based voltage and current integrated intelligent sensing device and method.The insulator-based voltage and current integrated intelligent sensing device comprises a voltage sensing unit, a current sensing unit and an insulation fixing box, firstly, line voltage and current are detected on the basis that the insulation performance and mechanical strength of an insulator are kept sufficient; then, the voltage sensing unit realizes uniformization of an induced electric field, determination of a transfer function and relative minimization of partial discharge, and the voltage sensing unit is implanted into the insulator, so that the insulation performance of the voltage sensing unit is good; and finally, the current sensing unit improves the magnetic field measurement sensitivity by utilizing the magnetic gathering capability of the open type magnetic ring air gap and the optimization design of the magnetic ring structure parameters, and enhances the magnetic interference resistance by utilizing the optimization design of the magnetic ring structure parameters and the magnetic ring series.

The invention discloses a high-precision alternating-current voltage direct-current component detection circuit which comprises a capacitance-resistance voltage division circuit, a differential amplification circuit, a second-order RC filter circuit, a voltage following and lifting circuit and an AD voltage clamping circuit which are arranged in sequence. The invention aims to improve the detection precision of the direct-current voltage in the alternating-current output voltage of the energy storage converter and feed back the detected accurate direct-current voltage amplitude to the CPU to carry out closed-loop control on the system output voltage so as to achieve the purpose of reducing the direct-current component in the alternating-current output voltage of the energy storage converter.

The present disclosure relates to apparatus and methods for determining a transfer function of a current measurement arrangement (118), or a change in a transfer function of the current measurement arrangement. In one aspect, an apparatus is disclosed comprising: a signal source (112) configured to apply a reference signal to a first current transducer (110) such that a first transducer output signal from the first current transducer comprises: a current measurement signal indicative of the first current passing through a first conductor (104); and a reference signal component resulting from the reference signal; and signal processing circuitry (116)configured to determine the transfer function of the current measurement arrangement by: extracting the reference signal component from the first transducer output signal; and determining the transfer function of the current measurement arrangement based on the transducer output signal.

1. Capacitive voltage testing device. 2.1. The invention relates to a capacitive voltage testing device with a capacitive voltage divider comprising a primary capacitor for coupling to a voltage to be measured at the measuring point and a secondary capacitor for coupling to a reference potential at the evaluation point, and an evaluation unit having a measurement signal input coupled to a center tap of the capacitive voltage divider. 2.2.The capacitive voltage testing device according to the invention comprises a multi-core test lead (4) with a first conductor (A1) and a second conductor (A2) electrically insulated from the first conductor (A1), which together form the primary capacitor (C1), wherein one (A1) of the two conductors (A1, A2) has a measuring voltage connection (5) on the measuring point side and an insulated connection (6) on the evaluation side, and the other conductor (A2) has an insulated connection (7) on the measuring point side and a center tap connection (8) on the evaluation side. 2.3. Use e.g. for voltage testing in low-voltage systems.

A Module (MA) for a system (100.S / 200.S) suitable for estimating the value of the electric voltage comprises at least a first capacitor (C1.sx) and a second capacitor (C1.dx. The first capacitor (C1. left) comprises a first pole (C1.sx.p1) and a second pole (C1.sx.p2). The second capacitor (C1.dx) includes a first pole (C1.dx.p1) and a second pole (C1.dx.p2). The first capacitor (C1.sx) has its first pole (C1.sx.p1) connected to said live element (ET) and the second capacitor (C1.dx) has its first pole (C1.dx.p1) connected to said live element (ET).

The invention discloses a sampling circuit and a calibration method thereof, a battery management system and a power utilization device. The calibration method comprises the following steps: acquiring the voltage of a first type of sampling points and the voltage of a second type of sampling points; determining a calibration factor corresponding to the first type of sampling points according to the voltage of the first type of sampling points and the voltage of the second type of sampling points; and based on the calibration factor, correcting the voltage of the first type of sampling points to obtain the corrected voltage of the first type of sampling points. The problem that the sampling precision of the sampling points in the sampling circuit is poor can be solved.

The invention discloses a method and equipment for rapidly detecting the content of progesterone in cow and sheep milk, and the method comprises the following steps: respectively collecting an optical signal, an electrochemical signal and current and voltage data of a sample in the cow and sheep milk through an optical detection module, an electrochemical detection module and a current and voltage detection module; the physical and chemical characteristics of the sample in the cow and sheep milk can be comprehensively analyzed from multiple dimensions. The detection data can be quickly and accurately processed and transmitted by combining a signal processing system and equipment, a reliable guarantee is provided for subsequent analysis, and in addition, a progesterone mathematical model embedded into the signal processing system realizes high-precision calculation of the concentration of progesterone in milk of cattle and sheep by combining a detection signal and a standard curve. The model not only improves the accuracy of a detection result, but also remarkably shortens the analysis time, and practically meets the urgent requirements for rapid detection and efficient output in practical application.

According to the power supply system and the network equipment provided by the invention, the second detection voltage of the first connector is acquired through the first detection voltage provided by the voltage source, so that the type of a power line is identified according to the second detection voltage, the reliability of the power line is ensured, and the operation and maintenance cost of the network equipment is not increased. The power supply system may include a power supply module. The power module may include a voltage source, a sampling circuit, and a first connector, where the first connector may be configured to be connected to a power line, which may be connected to a power supply. The voltage source may be used to provide a first detection voltage for the first connector. The sampling circuit can be used for collecting a second detection voltage from the first connector and identifying the type of the power line according to the second detection voltage.

The embodiment of the invention discloses a circuit and method for measuring the average current of an electromagnetic valve, and belongs to the technical field of automotive electronics. The circuit comprises an electromagnetic valve, a first power supply, a sampling resistor, a field effect transistor driving circuit, a current acquisition circuit, an integral circuit and an integral reset circuit, the field effect transistor driving circuit is used for controlling the on-off state of the first field effect transistor based on the pulse width modulation gating signal; the first power supply is used for providing driving current for the electromagnetic valve under the condition that the first field effect transistor is in a conducting state, and the driving current flows through the sampling resistor; the current acquisition circuit is used for sampling voltage signals on two sides of the sampling resistor and outputting the voltage signals to the integrating circuit; the integral circuit is used for performing integral processing on the voltage signal and determining the average current of the electromagnetic valve based on an integral result; and the integral reset circuit is used for performing periodic reset processing on the integral circuit based on the pulse width modulation gating signal.

The utility model discloses a grading regulation and control type voltage signal detection circuit, and belongs to the technical field of voltage signal detection. The circuit comprises a multi-stage voltage division module, a voltage division adjusting module and a signal detection end, and the multi-stage voltage division module is coupled to a detected load and used for achieving multi-gear voltage division of the voltage difference between the positive electrode and the negative electrode; the voltage division adjusting module controls access of divider resistors of different gears through a switching unit, and dynamic adjustment adapting to different voltage ranges is achieved. And the signal detection end is used for detecting and outputting the processed voltage signal. The circuit can automatically switch proper voltage division coefficients according to different load voltages, realizes wide-range high-precision voltage detection, effectively improves the stability and accuracy of voltage acquisition, improves the test quality and production efficiency of a PIV curve, and is especially suitable for test application of voltage fluctuation sensitive equipment such as a laser.

Provided is a direct current voltage sampling circuit used for a medium-voltage power module. The medium-voltage power module includes two cascaded H-bridge circuits. The sampling circuit includes two sampling sub-circuits, with each connected to one H-bridge circuit. The sampling sub-circuit includes: a voltage dividing circuit connected in parallel to an output end of the H-bridge circuit, an isolation module connected to the voltage dividing circuit, a direct current isolated power supply which supplies power to the isolation module independently of the H-bridge circuit, and an amplifier conditioning module which converts an isolated voltage signal into a sampled voltage output. Parasitic capacitances of the isolation module and the direct current isolated power supply are both less than 2 pF, and the sampled voltage outputs of the two sampling sub-circuits are provided to a same local controller. The sampling circuit can suppress the impact of circulation components between two direct current buses in double cascaded bridges, making sampling results more accurate.

The invention discloses a voltage and current synchronous measurement method for a high-voltage power supply of a fusion device, which is suitable for accurately sampling and monitoring voltage and current signals of each key node of the high-voltage power supply of the fusion device. According to the method, firstly, a resistance-capacitance voltage division technology is adopted, a front-end high-voltage attenuation network is constructed by utilizing high-precision resistors and capacitors, and stable voltage division and linear attenuation of high-voltage signals are achieved; then, electrical isolation is realized through a small-signal voltage and current transformer, and multi-channel synchronous acquisition of voltage and current signals is completed respectively. Then, the ADC module adopts two multi-channel AC sampling special electric energy metering chips to realize ten-channel synchronous acquisition of high voltage and current signals. And finally, the FPGA receives, processes and analyzes the acquired data in real time, and transmits a result to an upper computer monitoring platform. According to the method, the synchronism, the precision and the anti-interference performance of a fusion power supply high-voltage measurement system are remarkably improved, and reliable data support is provided for safe and stable operation of a fusion device.

The utility model discloses a current sampling system and an energy storage device. The current sampling system comprises a control unit, a plurality of current sampling circuits and a plurality of signal processing circuits, wherein each current sampling circuit is provided with a sampling resistor and a switching device; a connecting end after the first ends of the current sampling circuits are connected is connected with the negative electrode end of the storage battery, and a connecting end after the second ends of the current sampling circuits are connected is connected with an external power device; the signal receiving end of each signal processing circuit is connected with the sampling resistor in the current sampling circuit corresponding to the signal processing circuit, and is used for collecting differential voltage at the two ends of the sampling resistor and sending the differential voltage to the control unit; the control unit is used for receiving the differential voltage and determining the battery current of the storage battery based on the differential voltage. According to the technical scheme disclosed by the utility model, the sampling precision of the battery current of the storage battery can be improved.

The invention provides a capacitor voltage transformer partial voltage capacitance measuring method based on short circuit frequency scanning, and belongs to the field of electrical insulation detection of electrical equipment, and the method comprises the steps: carrying out the first short circuit impedance test of a capacitor voltage transformer, measuring the frequency-dependent short circuit impedance containing a second capacitor, and obtaining the first frequency-dependent short circuit impedance; performing a second short-circuit impedance test, and measuring frequency-dependent short-circuit impedance including the first capacitor and the second capacitor to obtain second frequency-dependent short-circuit impedance; drawing a frequency-dependent short-circuit impedance curve according to the first frequency-dependent short-circuit impedance and the second frequency-dependent short-circuit impedance, and calculating to obtain a first capacitance reference value and a second capacitance reference value; the first capacitance reference value and the second capacitance reference value are combined with the ratio of the intermediate voltage transformer, a measured value of the voltage dividing capacitance is calculated, and measurement of the voltage dividing capacitance of the capacitor voltage transformer is completed. The problems that wiring is complex and the precision is greatly influenced by a wiring mode in an existing capacitance value measuring method are solved.

The invention discloses a slope landslide and bridge collapse disaster monitoring and early warning device, and belongs to the technical field of geological monitoring. The method comprises the following steps: under the condition of carrying out monitoring and early warning on a slope landslide disaster, a sensing line is arranged on a slope through longitude lines or latitude lines; under the condition that monitoring and early warning are carried out on bridge collapse disasters, the sensing lines are arranged around each beam piece and intersect with the beam pieces. Under the condition that the slope does not slide or the bridge does not collapse, the voltage between the first wiring terminal and the second wiring terminal is in a first state; under the condition that the slope slides or the bridge collapses, the sensing circuit breaks, and the voltage detection circuit determines that the voltage between the first wiring terminal and the second wiring terminal is in a second state; and determining the voltage between the first terminal and the second terminal as a third state through the voltage detection circuit under the condition of sensing that the circuit is short-circuited. According to the method, early warning can be carried out on the condition that the broken line may be short-circuited at the water accumulation position, and the reliability is high.

Sensored insulation plug for a medium voltage or high-voltage separable connector in a national grid, and operable to insulate a connection element of the separable connector on an elevated voltage and to simultaneously detect and sense the elevated voltage. The sensored insulation plug comprises a) a plug body formed by a solidified insulating material, b) an externally accessible detection contact, c) a primary capacitor, operable as a high-voltage capacitor in a sensing voltage divider for sensing the elevated voltage, the primary capacitor having i) a high-voltage electrode; ii) a sensing electrode embedded in the plug body; iii) a dielectric formed by a first portion of the insulating material, and d) a testpoint capacitor, operable as a high-voltage capacitor in a detection voltage divider for detecting the elevated voltage and comprising i) the high-voltage electrode, ii) a testpoint electrode, embedded in the plug body and electrically connected to the detection contact, and iii) a dielectric formed by a second portion of the insulating material.

The invention discloses a harmonic monitoring system and method for a wall bushing of a flexible direct current converter station, and relates to the technical field of harmonic monitoring of a power system, and the system comprises a capacitor voltage dividing part which is connected in series with a main capacitor of the wall bushing for voltage division; the broadband current sensing component is annularly arranged on the outer wall of the bushing between the bushing tap and the capacitance voltage dividing component and is connected with the data acquisition component; the data acquisition part is connected with the capacitance voltage division part and the broadband current sensing part, executes synchronous sampling, filtering, wavelet transformation, harmonic modeling and feature extraction, and uploads a result to a data analysis background; the data analysis background is in communication connection with the data acquisition component and is used for receiving the uploaded data frame and cooperatively displaying harmonic monitoring information with the interactive interface; according to the system, structure coupling modeling and high-frequency signal synchronous acquisition linkage are realized, a multi-channel harmonic monitoring closed-loop path is constructed, and the monitoring integrity and the system collaboration are improved.

A measuring device for has a housing, a measuring circuit board, and a communication circuit board. The measuring circuit board has a voltage connection, a voltage divider, a CT connection for connecting an external current transformer, a measuring chip connected to the voltage divider and the CT connection for determining electrical quantities and outputting as measurement data to a first part of a plug connector. The communication circuit board is connected to a second part of the plug connector, which together with the first part connects the communication circuit board and the measuring circuit board, a data communication chip connected to the second part and electrically isolated to receive the measurement data from the measuring chip, where a galvanic isolation between the measuring chip and the data communication chip is provided on the communication circuit board, a data connection connected to the data communication chip and a user interface.

One or more examples relate to methods and apparatuses for measuring a voltage node. An example method may include providing, between an input of a measurement circuit and a voltage node associated with a higher voltage domain than the measurement circuit, a circuit including decoupled capacitors, the decoupled capacitors including at least a first capacitor and a second capacitor; generating, by the measurement circuit, a first digital value representing a voltage level related to a voltage level at the voltage node at least partially responsive to performing a measurement process utilizing the circuit; and generating, by a processor, a second digital value representing the voltage level at the voltage node at least partially responsive to the first digital value and a scaling factor, the scaling factor representing a pre-specified relationship between the voltage level represented by the first digital value and the voltage level at the voltage node.

The invention provides a battery capacity detection circuit and detection method. One end of a first signal link of the battery capacity detection circuit is used for being connected with a battery to be detected, and the other end is connected with a first control unit; one end of the second signal link is connected to the first signal link, and the other end is grounded; a divider resistor is arranged on the second signal link; the second control unit is configured to disconnect the second signal link before detecting the capacity of the battery to be detected; under the condition that the capacity of the battery to be detected is detected, conducting a second signal link; the first control unit is used for acquiring a first voltage signal when the second signal link is disconnected and acquiring a second voltage signal when the second signal link is connected; the first control unit is also used for obtaining the capacity of the to-be-detected battery based on the first voltage signal and the second voltage signal; the capacity of the to-be-detected battery is calculated through the first signal and the second signal, and compared with detection of a single voltage value, the detection accuracy is higher.

An apparatus for detecting protective earth (PE) open of an electric vehicle charging controller (EVCC) according to one embodiment of the present invention comprises: a first voltage detection unit for detecting a negative voltage of a connector proximity detection line; and a control unit for determining that a PE between electric vehicle supply equipment (EVSE) and the electric vehicle charging controller is open when the voltage value detected by the first voltage detection unit is within a predetermined value.

The invention discloses an insulation detection circuit. The insulation detection circuit comprises a first sampling resistor group comprising a plurality of first sampling resistors with different resistance values; one end of the third switch is connected with the other end of the first sampling resistor, and the other end is connected with an anode of a high-voltage power supply unit or a low-voltage power supply unit of the electrical system; comprising a plurality of second sampling resistors with different resistance values; one end of the fourth switch is connected with the other end of the second sampling resistor, and the other end is connected with the cathode of the high-voltage power supply unit or the low-voltage power supply unit; the first divider resistor is connected in series with the first sampling resistor; the second divider resistor is connected in series with the second sampling resistor; and the control unit is used for determining the accessed first sampling resistor and second sampling resistor and the first voltage and the second voltage at the two ends of the sampling resistor so as to determine the insulation condition between the high-voltage power supply unit and the low-voltage power supply unit. The circuit can improve the insulation detection precision. The invention further discloses an insulation detection method.

The invention discloses a milliohm-level resistance real-time measuring circuit which comprises a power supply circuit, a voltage division circuit, an operational amplifier circuit, a lifting circuit, an ADC acquisition module, an MCU and an LED display screen which are sequentially connected in series, the MCU is connected with the power supply circuit through a relay switch circuit, and the power supply circuit is connected with the voltage division circuit through a current mutual inductance circuit. The invention also discloses a milliohm-level resistor real-time measurement method, which comprises the following steps of: utilizing the measurement circuit, performing wiring measurement on the measured resistor by adopting a four-wire method, controlling the relay by the MCU to circularly switch on power supply in real time, performing voltage division, operational amplification and lifting processing on a signal, then performing segmented acquisition, performing effective acquisition value judgment and A / D conversion by the MCU, and finally displaying a calculated resistance value on the LED display screen. The invention belongs to the technical field of circuit measurement, adopts segmented acquisition, is high in acquisition precision and high in stability, and can continuously and circularly measure in real time for a long time as a relay is switched on for power supply at regular time.