620results 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.

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.

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.

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.

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).

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 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.

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 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.

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 a frequency converter, a current sampling circuit thereof and a three-phase current sampling method of a motor, the frequency converter is suitable for driving the motor in a compressor, and the current sampling circuit comprises a single-resistance sampling unit configured to perform current sampling at a voltage effective vector moment so as to obtain three-phase current of the motor; the multi-resistance sampling unit is configured to perform current sampling at a voltage zero vector moment so as to obtain three-phase current of the motor; and the switching control unit is configured to acquire parameters of the motor, determine a switching index according to the parameters of the motor, and select one of the single-resistor sampling unit and the multi-resistor sampling unit to perform current sampling based on the switching index. The current sampling circuit can solve the problems that the noise of the motor is large due to single-resistor sampling and the performance of the motor is reduced due to multi-resistor sampling, so that the performance of the motor is improved.

A test circuit (11) comprises a supply terminal (12), a reference potential terminal (13), a first number N of digital terminals (14 - 16) and a first number N of switches (17 – 19), a supply input terminal (35), and a support resistor (37). The support resistor (37) is coupled to the supply terminal (12) and to the supply input terminal (35). A switch (17) is coupled to the supply terminal (12) and to a digital terminal (14). An industrial device (50) comprises a supply line (51), a reference potential line (73), a control circuit (52), a second number M of device terminals (53 – 55) and a presence detector (83) coupled to the supply line (51) and to the reference potential line (73). The presence detector (83) is configured to detect a first value of a supply voltage (US1) at the supply line (51) when the presence detector (83) is in a high resistive state, and a second value of the supply voltage (US1) when the presence detector (83) is not in a high resistive state.

A system for cell balancing includes: a current measurement circuit to measure a current of a power consumption circuit configured to consume power of a first set of battery cells; a control signal generation circuit to generate a control signal based on the current measured by the current measurement circuit; and a discharge circuit electrically isolated from the control signal generation circuit, and to discharge a second set of battery cells based on the control signal.

The embodiment of the utility model provides a range switching circuit and a formation and capacity grading system, and belongs to the technical field of electronic circuits. The range switching circuit comprises: a reactor circuit comprising a plurality of reactors; a sampling circuit coupled to the reactor circuit to detect a current flowing through the reactor circuit; the range switching module comprises a switch control circuit and at least one bypass switch module, the bypass switch module is connected with the at least one electric reactor in parallel, a switch control pin of the bypass switch module is connected with the switch control circuit, and the rate of a switch signal output by the switch control circuit is larger than the sampling rate of the sampling circuit; and the current compensation module is connected with the sampling loop of the sampling circuit and is used for performing current compensation under the condition that the current of the sampling loop changes suddenly. According to the embodiment of the invention, the current measurement precision of the battery in the formation and capacity grading process is improved.

The invention provides an implementation method for measuring the ignition resistance of an industrial electronic detonator, which belongs to the technical field of resistance measurement, and comprises the following steps: the measurement of the ignition resistance of the industrial electronic detonator is realized based on a detection circuit, the detection circuit comprises an MCU microcontroller U1, a single-pole double-throw physical relay U2, a relay change-over switch triode Q1, a divider resistor R1 and a divider resistor R2 of the measurement circuit, and a dual-path integrated operational amplifier. The test state of the ignition resistor is switched based on a single-pole double-throw physical relay U2 and a relay change-over switch triode Q1; a millivolt-level weak signal is output to a measuring circuit based on the MCU microcontroller U1, and specific voltage values of a point A and a point B corresponding to the divider resistor R1 and the divider resistor R2 in different test states are controlled; the specific voltage values of the point A and the point B are amplified by the same multiple based on the integrated operational amplifier of the two paths, so that the current value flowing through the measuring circuit is calculated, the ignition resistance value is calculated, and the measuring precision is effectively guaranteed.

The utility model provides an energy storage confluence cabinet and an energy storage system, and the energy storage confluence cabinet comprises a cabinet body; the primary side loop is arranged in the cabinet body, the first end of the primary side loop is connected with the charging and discharging end of the battery, and the second end of the primary side loop is connected with the direct current end of the energy storage converter; and the detection device comprises a direct current voltmeter, the detection end of the direct current voltmeter is connected with the second end of the primary side loop, and the direct current voltmeter is arranged on the outer surface of the cabinet body. In the energy storage confluence cabinet and the energy storage system disclosed by the invention, the direct current voltmeter can read the voltage of the primary side loop and visually display the voltage on the outer surface of the cabinet body, so that the operation of frequently opening the cabinet body by an operator due to voltage detection is omitted, the efficiency of monitoring the voltage of the primary side loop is effectively improved, and the cost is reduced. And the electric shock risk of operators is reduced, so that the safety of primary side loop voltage monitoring is effectively improved.

A system for estimating the value of the electrical voltage relating to a live n element ET. The system comprises a first capacitor C1.sx, a second capacitor C1.dx, a third capacitor C2.sx, a fourth capacitor C2.dx, a fifth capacitor C3.dx. The System may include a modular structure.

The utility model provides a detection device and a frequency converter structure, and the device comprises a sampling module which is electrically connected with a first phase of a to-be-detected circuit, and is electrically connected with a second phase of the to-be-detected circuit; the sampling module outputs a sampling electric signal according to the electric signal of the first phase and the electric signal of the second phase; and the detection module is connected with the sampling module so as to receive the sampling electric signals, and the sampling module compares the sampling electric signals so as to output square wave signals according to the sampling electric signals. The detection device provided by the utility model solves the technical problem that the detected frequency of the frequency converter is inaccurate in the prior art.

The invention relates to a method for contactlessly providing a function in a motorized vehicle, the method comprising the steps of: a) recognizing (S2) the approach of a person towards the motorized vehicle; b) recognizing (S4) a gesture of the person; and c) providing (S5) a function in response to the recognition by steps a) and b), wherein ultrasonic signals are transmitted and received for the recognition in steps a) and b), and (i) the signal repetition rate of the transmitted ultrasonic signals is higher in step b) than in step a), and / or (ii) the repetition rate for receiving the ultrasonic signals is higher in step b) than in step a).

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.

A measuring system comprises a voltage converter circuit that converts and outputs a voltage between a first terminal and a second terminal, and a computing device that detects anomalies in the voltage converter circuit. The voltage converter circuit comprises: a first output circuit that outputs a first output voltage obtained by multiplying a potential of the first terminal with respect to a predetermined reference potential by a conversion gain; a second output circuit that outputs a second output voltage obtained by multiplying a potential of the second terminal with respect to the reference potential by a conversion gain; and a third output circuit that outputs a third output voltage obtained by multiplying a voltage between the first terminal and the second terminal by a conversion gain.The conversion gains of the first output circuit, the second output circuit, and the third output circuit can be set to values ​​of at least one first group and one second group, and the ratio between a first group conversion gain and a second group conversion gain set in the third output circuit differs from the ratio between a first group conversion gain and a second group conversion gain set in the first output circuit or the second output circuit.The computing device comprises the following: a voltmeter which measures the first output voltage, the second output voltage and the third output voltage, and a diagnostic unit which, using conversion gains of a selected group, which is one of the first group and the second group, calculates a first conversion value, a second conversion value and a third conversion value corresponding to input voltages of the first output circuit, the second output circuit and the third output circuit, based on the first output voltage, the second output voltage and the third output voltage, and determines that an anomaly exists if the sum of the first conversion value and the second conversion value deviates from the third conversion value by at least one predetermined value.

The invention discloses a self-adaptive high-precision voltage detection device and method for a high-voltage bushing end screen, the device comprises a high-voltage arm unit, a low-voltage arm unit, a signal acquisition unit, a control unit and a power supply unit, and the high-voltage arm unit takes the capacitance characteristic of a high-voltage bushing as a high-voltage arm; the high-voltage arm unit is connected with the low-voltage arm in parallel, the low-voltage arm is connected with the signal acquisition unit, and the signal acquisition unit is connected with the control unit; the power supply unit is connected with the low-voltage arm unit and the control unit. Wherein the signal acquisition unit is used for monitoring partial voltage and current signals of the low-voltage arm unit, the partial voltage and current signals are fed back to the control unit for processing, parameters of the low-voltage arm unit are dynamically adjusted to maintain a stable partial voltage ratio, and the capacitance value of the high-voltage bushing is measured and monitored. By means of the device, the influence of high-frequency parameter changes on the high-voltage bushing can be quantified, and more accurate and stable online monitoring is achieved.

The present invention discloses a DC voltage transformer, comprising: a resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit; the primary converter comprising a resistor-capacitor matching adjustment unit and a signal processing unit; the resistor-capacitor matching adjustment unit being configured to calculate the value ranges of an adjustable resistor and an adjustable capacitor based on stray capacitance parameters obtained by electric field simulation of the resistor-capacitor voltage divider when the resistor-capacitor matching relationship in the resistor-capacitor voltage divider is disrupted, and to adjust the adjustable resistor and the adjustable capacitor respectively; the signal processing unit being electrically connected to the resistor-capacitor matching adjustment unit and performing buffering, amplification, and low-pass filtering on a voltage signal passing through the resistor-capacitor matching adjustment unit, thereby converting the processed voltage signal into an optical signal, which is then transmitted to the secondary photoelectric conversion unit via an optical fiber. The present invention solves the technical problems in the prior art in that the stray capacitance of the resistor-capacitor voltage divider has a significant impact on frequency characteristics and that the analog signal transmission process is easily interfered with.

An image forming apparatus including a fixer, a print medium detection sensor adjacent to the fixer and to detect movement of a print medium, a fan adjacent to the fixer and to the print medium sensor, and a processor to control the image forming apparatus to heat the fixer for an image forming job, and based on a voltage value of an output signal of the print medium detection sensor not being in a predetermined range, to drive the fan to remove a foreign body on a surface of the print medium detection sensor so that the voltage value of the output signal of the print medium detection sensor is in the predetermined range.

The utility model provides a voltage sampling circuit based on electric field coupling and a radio frequency matcher. The voltage sampling circuit based on electric field coupling comprises a voltage sampling probe and an adjustable voltage dividing unit. The voltage sampling probe is used for acquiring a high-frequency high-voltage signal output by the radio frequency matcher through electric field coupling based on a distributed capacitor formed by the voltage sampling probe and sampling points of the radio frequency matcher, and outputting the acquired high-frequency high-voltage signal to the adjustable voltage dividing unit; and the adjustable voltage division unit is used for performing voltage division on the high-frequency and high-voltage signal by using the adjusted voltage division multiple after being triggered and adjusted, and outputting the high-frequency and high-voltage signal after voltage division to the processing module. According to the utility model, based on a distributed capacitor formed by the voltage sampling probe and the sampling points of the radio frequency matcher, an output voltage signal is obtained through electric field coupling, voltage sampling with electrical isolation is realized, and the problem of long installation and debugging time of the voltage sampling probe and the radio frequency matcher is solved by adjusting the voltage division multiple of the adjustable voltage division unit.

The semiconductor device includes: an insulating layer provided on a semiconductor substrate; a first resistor embedded in the insulating layer and electrically connected to a node on a first potential side; a second resistor embedded in the insulating layer; a third resistor embedded in the insulating layer; and a reference electrode electrically connected to a node on a second potential side of the third resistor. An absolute value of the first potential is greater than an absolute value of the second potential. The first resistor, the second resistor, and the third resistor are connected in series. The first resistor is formed by connecting N resistors in parallel, the second resistor is formed by connecting M resistors in parallel, and the third resistor is formed by connecting L resistors in parallel, with N<L and M<L satisfied.