85results about "Ac/dc measuring bridges" patented technology

The invention discloses a digital impedance measurement method and system, and the method comprises the steps: obtaining an excitation current and a reference current after a signal source is applied to a measured impedance and a reference impedance respectively, and enabling the excitation current and the reference current to be used for generating an unbalanced current; a data acquisition control system is used for carrying out real-variable sampling ratio mixed sampling on the unbalanced current, the measured impedance voltage and the reference impedance voltage and then carrying out digital conversion on the unbalanced current, the measured impedance voltage and the reference impedance voltage; respectively acquiring vector components of the deviation voltage, the measured impedance voltage and the reference impedance voltage by using a digital orthogonal coherent detection algorithm; adjusting the balance state of the bridge circuit according to the vector component of the deviation voltage; and after balance adjustment, vector components of the measured impedance voltage and the reference impedance voltage are transmitted to an impedance calculation unit, and a plurality of parameters of impedance are obtained. By adopting the methods of high-speed synchronous data acquisition, low-jitter sampling clock, variable-sampling-ratio mixed sampling and the like, the measurement range and the measurement efficiency of the system are improved.

The invention relates to a method and a device for determining a digital value indicative of a physical quantity to be measured. A method (1000) of providing a digital value (Dout) indicative of a physical quantity to be measured by a sensor circuit or bridge circuit having two excitation nodes (E1, E2) and at least one output node (RO1, RO2), the method comprising the steps of: a) applying (1002) a time-varying bias signal to the excitation nodes, such that at least one output node provides a time-varying output signal (Vp, Vn); b) determining (1003) a first time value (T1) or a first count value (N1) or a first index (Index1) associated with a first event (event1) at which the first output signal (Vp) exceeds the first threshold signal (Vt1); c) providing (1004) a digital value (Dout) indicative of the physical quantity to be measured based on the at least one time value (T1) or count value (N1) or index value (Index1).

The application provides a double alternating current bridge impedance separation detection circuit and a detection method. One end of a first connecting terminal of a first alternating current bridge is connected with one end of a voltage source and one end of a first connecting terminal of a second alternating current bridge; one end of a second connecting terminal of the first alternating current bridge is connected with one end of a first balance resistor R s1 ; one end of a third connecting terminal of the first alternating current bridge is connected with one end of a second balance resistor R s2 ; the other end of the first balance resistor R s1 is connected with the other end of the second balance resistor R s2 , the other end of the voltage source, one end of a third balance resistor R s3 and one end of a fourth balance resistor R s4 ; the other end of a second connecting terminal of the second alternating current bridge is connected with the other end of the third balance resistor R s3 ; and the other end of a third connecting terminal of the second alternating current bridge is connected with the other end of the fourth balance resistor R s4 . The application can accurately separate the impedance and inductance change amount of a large-range eddy current displacement sensor in a detection process, and more accurately measure the displacement size between an eddy current probe and a target.

The invention relates to a capacitive sensor arrangement (4) for detecting at least one approaching object (5), wherein the sensor arrangement (4) is designed as a touch sensor (9) and comprises a plurality of electrodes (4.1 to 4.n), each designed as a planar electrode and arranged aligned with and spaced apart from one another, wherein: - each electrode (4.1 to 4.n) has a predetermined capacitance and is connected to an evaluation unit (6) which detects changes in the capacitance of the respective electrode (4.1 to 4.n), - one of the electrodes (4.1) is a main electrode (S) and the other electrodes (4.2 to 4.n) are auxiliary electrodes (H), - the evaluation unit (6) is configured to measure all electrodes (4.1 to 4.n).n) jointly monitor such that changes in the capacitances of the multiple auxiliary electrodes (H) and changes in the capacitance of the main electrode (S) are recorded and compared with each other and / or with predetermined reference values, and - the evaluation unit (6) is set up to check the plausibility of the recorded changes (D(S)) in the capacitance of the main electrode (S) on the basis of the recorded changes (D(H)) in the capacitances of the multiple auxiliary electrodes (H) as to whether or not there has been contact with or approach to the main electrode (S).

The invention relates to a resistor layout (1) for a Wheatstone bridge comprising four electrical resistance elements (2, 3), wherein the structures of the four resistance elements are arranged concentrically around a common center point (M) and extend in a radial and a tangential direction to the center point, wherein the first resistance elements extend tangentially around the center point by a defined angle α and the second resistance elements extend tangentially around the center point by a defined angle β.

Provided is an electric current sensor comprising: a first bus bar (10A), a second bus bar (10B), and a third bus bar (10C) through which a three-phase AC current flows; a first sensor unit (20A) having a first magnetic detection element (30A) and a second magnetic detection element (30B); and a second sensor unit (20B) having a third magnetic detection element (30C) and a fourth magnetic detection element (30D), the first sensor unit (20A) being disposed between two bus bars other than one arbitrary bus bar to be measured from among the first through third bus bars, the second sensor unit (20B) having as a measurement object one of the two bus bars other than the one bus bar to be measured, and being disposed between the one bus bar to be measured and the other of the two bus bars other than the one bus bar to be measured, the distance between the first magnetic detection element (30A) and the one of the two bus bars other than the one bus bar to be measured and the distance between the second magnetic detection element (30B) and the other of the two bus bars other than the one bus bar to be measured being substantially equal, and the distance between the third magnetic detection element (30C) and the other of the two bus bars other than the one bus bar to be measured and the distance between the fourth magnetic detection element (30D) and the one bus bar to be measured being substantially equal.

Provided is a distributed insulation detection device for a multi-stage DC system. A basic insulation combination module is configured to detect a ground insulation fault of the multi-stage DC system, a sampling module is configured to collect voltage data and / or leakage current data of the multi-stage DC system, to transmit the collected voltage data and / or the leakage current data to an intelligent control module for data processing, to control a resistance value of the basic insulation combination module and a resistance value of an intelligent resistance switching network module, so as to adjust a total balance resistance of the distributed insulation detection device for the multi-stage DC system.

The invention relates to a pressure sensor and a sensor. The pressure sensor comprises a sensor element (WB) in the form of a Wheatstone bridge and having four piezoresistive resistors (R1, R2, R3, R4), and a reference element (RW) in the form of a reference Wheatstone bridge and having four piezoresistive reference resistors (R5, R6, R7, R8), the reference resistors (R5, R6, R7, R8) being arranged in the same way as the resistors (R1, R2, R3, R4), the pressure sensor being arranged on a single crystal and comprising a cavity closed on one side by a diaphragm, the resistors (R1, R2, R3, R4) being arranged at least partially on the diaphragm, the reference resistors (R5, R6, R7, R8) not being arranged on the diaphragm, the first to fourth resistors (R1, R2, R3, R4) respectively being identical to the fifth to eighth resistors (R5, R6, R7, R8) in that they are constructed in the same way, and the reference Wheatstone bridge (RW) serving as a reference noise source for subsequent signal processing.

The invention discloses an unbalanced bridge method direct current insulation detector with a compensation correction function. The detector takes a microcontroller as a core and is connected with an unbalanced bridge detection module, a key setting module, a communication module, a detection indication module and an alarm output module; the unbalanced bridge detection module comprises an unbalanced bridge circuit and a signal conditioning circuit, the unbalanced bridge circuit is used for establishing an unbalanced bridge loop between the positive electrode and the negative electrode of the detected direct current system and the ground, and when the direct current system has insulation imbalance, an unbalanced voltage signal is output; after being amplified and filtered by the signal conditioning circuit, the signals are input into the microcontroller, the microcontroller calculates to obtain positive electrode resistance to ground and negative electrode resistance to ground and compares the positive electrode resistance to ground and the negative electrode resistance to ground with a threshold value, and when a detection result is lower than the threshold value, an alarm is triggered or a fault loop is cut off. According to the invention, a hardware and software combined compensation correction technology is adopted, and the method has the advantages of fast detection speed, high precision, strong anti-interference capability and flexible communication.

A device and a method evaluate signals from one or more Wheatstone bridges. The requirements of ISO 26262 are taken into account by mixing a test signal with the measurement signal before amplification and before analog-to-digital conversion. After amplification and analog-to-digital conversion, the measurement signal and the test signal are unmixed again. If the test signal does not meet the expectation, the amplifier and / or the analog-to-digital converter is determined to be faulty.

The invention relates to a measurement system (10) for measuring energy cells (20), for example battery cells, in particular of dry monocells, wherein the measurement system (10) has an alternating voltage measuring bridge or a self-balancing measuring bridge (auto-balancing bridge) (11) and is designed to measure the electrical capacitance (C) and / or the ohmic resistance (R) of an energy cell (20) by means of a high-frequency measurement. The invention also relates to a corresponding method.

The invention relates to a device and a method for evaluating signals from one or more Wheatstone bridges. According to the invention, requirements of ISO 26262 are taken into account by mixing a test signal with the measurement signal before amplification and before analog-to-digital conversion. After amplification and after analog-to-digital conversion, the measurement signal and the test signal are separated again. If the test signal is not as expected, then the amplifier and / or the analog-to-digital converter is defective. The advantage of the method is that it can be used during, but without interfering with, normal operation.

A pre-driving stage drives one or more Field Effect Transistors in a power stage driving a load. A method for measuring current flowing in the Field Effect Transistors includes: measuring drain to source voltages of the one or more Field Effect Transistor; and measuring an operating temperature of the one or more Field Effect Transistor. The current flowing in the Field Effect Transistors is measured by: calculating the respective on drain to source resistance at the operating temperature as a function of the measured operating temperature and obtaining the current value as a ratio of the respective measured drain to source voltage over the calculated drain to source resistance at the operating temperature.

A method of providing a digital value indicative of a physical quantity to be measured by a sensor circuit or a bridge circuit that has two excitation nodes and at least one output node, comprises the steps of: a) applying a time-varying biasing signal to the excitation nodes, causing at least one output-node to provide a time-varying output signal; b) determining a first time value or a first count value or a first index related to a first event at which the first output signal passes a first threshold signal; c) providing a digital value indicative of the physical quantity to be measured based on said at least one time value or count value or index value.

A system (200) for acoustically detecting dielectric breakdown of, or partial discharge within, or on, an electrical device (102) includes at least one electroacoustic (EA) transducer (106) configured to detect an acoustic vibration of the electrical device (102), and a controller (108) electrically connected to the at least one EA transducer (106). The controller (108) is configured to receive a signal from the at least one EA transducer (106), and analyze the signal to determine whether the signal includes data associated with an acoustic vibration in a frequency range of dielectric breakdown and / or partial discharge of the electrical device (102). The applicability of such a system (200) includes, but is not limited to, electronic parts or assembly screening, life characterization testing for materials and processes, diagnostic methods or aides, augmenting testing of components, assemblies or systems, and in service monitoring to support preventative or condition based maintenance to avert an in-service issues.

The invention relates to a device and a method for evaluating signals from one or more Wheatstone bridges. Here, the requirements of ISO 26262 are taken into account by mixing a test signal with the measurement signal before amplification and before analog-digital conversion. After amplification and analog-digital conversion, the measurement signal is again unmixed from the test signal. If the test signal does not correspond to the expected value, the amplifier and / or the analog-digital converter is faulty. The process has the advantage that it can be used during regular operation without being disturbed.

A capacitive position sensor includes a capacitance bridge and a balanced bridge circuit. The capacitance bridge includes at least one first electrode, and at least two second electrodes. The balanced bridge circuit separately adjusts excitation of the at least two second electrodes to balance a signal at the at least one first electrode toward a desired target value, wherein a level of the excitation is used as input to calculate a position of the at least one first electrode relative to the at least two second electrodes.

In the case of measuring bridge amplifiers for sensors, it often seems paradoxical that the required high amplification of the tap voltages from a measuring bridge is so easily achievable with electronics on the one hand, but on the other hand, a very high amplification severely restricts the range in which the measuring bridge can be used in a real application. In the current state of the art, only one operating state is provided for a measuring bridge adapted to the respective application, and any different measuring ranges are only available nested within each other. Using the same measuring bridge in at least two measuring ranges, which may also be adjacent, mutually exclusive, and automatically transition into one another, is not possible. To use measuring bridges in different, adjacent, or at a defined distance from each other measuring ranges, the measuring voltage at one of the tap nodes can be kept constant for a selected sub-measuring range, for example, by means of current taps, thus providing a first measuring range with very high resolution. By tapping the measuring voltages from the tap nodes at least once more using additional voltage taps, the same measuring bridge can be operated in a different operating mode outside the first measuring range. Multiple high-resolution measurement ranges can be achieved with the same measuring bridge.

The present disclosure provides an interconnection structure impedance measurement circuit, in which a Wheatstone bridge structure is optimized by using three branches connected in parallel where interconnection structures to be measured in one branch are connected in series while two resistors in the other two branches are connected in series. The branch with the interconnection structures and one of the other two branches are controlled to be simultaneously closed to measure a voltage between the two branches that are closed, and an impedance of two interconnection structures is calculated according to a current introduced into the interconnection structure impedance measurement circuit, the measured voltage, and resistances in the branches. The present disclosure further provides interconnection structure impedance measurement device and method.

A system and method for acoustically detecting dielectric breakdown or partial discharge in an electrical device, the system including at least one electroacoustic (EA) transducer configured to detect acoustic vibrations of the electrical device, and a controller electrically connected to the at least one EA transducer. The controller is configured to receive a signal from the at least one EA transducer and analyze the signal to determine whether the signal includes data associated with acoustic vibrations in a frequency range of dielectric breakdown and / or partial discharge of the electrical device. The applicability of this system includes, but is not limited to, screening of electronic parts or components, lifetime characterization testing of materials and processes, diagnostic methods or aids, enhanced testing of components, assemblies or systems, and in-service monitoring to support preventive or conditional maintenance to avoid problems in service.

The present application relates to a current sensor for a printed circuit board, and provides a non-contact current sensing circuit for sensing current in a conductive line on a dielectric substrate of a printed circuit board (PCB), comprising a plurality of magnetic tunnel junction (MTJ) structures comprising first and second MTJ structures on a first side of the conductive line, and third and fourth MTJ structures on a second side of the conductive line opposite the first side. The MTJ structure is located in an H-field induced by current flowing through the wire.

Provided is an interconnected structure impedance measurement circuit. By optimizing the Wheatstone bridge structure, three parallel branches are adopted. In one of the branches, the interconnected structure to be measured is connected in series, and the two resistors in the other two branches are connected in series. Control is performed such that the branch of the interconnected structure is turned on simultaneously with one of the other two branches, the voltage between the two turned-on branches is measured, and the impedance of the two interconnected structures is calculated based on the current introduced into the interconnected structure impedance measurement circuit, the measured voltage, and the resistance in the branch. The embodiments of the present disclosure can easily and scalably measure the impedance of the interconnected structure, and can accurately monitor in real time the impedance of a single interconnected structure in a reliability experiment. The present disclosure further provides an interconnected structure impedance measurement device and a measurement method.

A circuit arrangement for operating a resistive sensor element is described. According to one embodiment, the circuit arrangement comprises a first supply terminal and a second supply terminal, between which a supply voltage is applied during operation, as well as a sensor circuit with at least one resistive sensor element. The sensor circuit has a first circuit node and a second circuit node for applying a sensor voltage, the first circuit node being connected to the first supply terminal. The circuit arrangement further comprises a sensor supply circuit configured to electrically couple a charged capacitor to the second circuit node during a measurement time interval such that the sensor voltage between the first circuit node and the second circuit node is greater than the supply voltage.

The present application discloses a DC current comparator bridge and a current source calibration method thereof, and relates to the field of measuring devices. The DC current comparator bridge includes a master / slave current source, a main circuit integer turn / fractional turn adjustable winding, an integer turn / fractional turn switch matrix, an integer turn / fractional turn drive module, a slave circuit fixed turn winding, a differential compensation module, a modulation module, a demodulation module, a conditioning module, an ADC, a control module and other structures; wherein the master and slave current sources both include a reference DAC and a transconductance amplifier; the reference DAC receives a code value from the control module, and outputs a voltage corresponding to the code value to the transconductance amplifier; the transconductance amplifier converts the voltage signal output by the reference DAC into a current signal; the control module calculates the correction value corresponding to the master and slave current sources according to the ADC sampling data, and corrects the code value received by the master and slave current sources based on the correction value, completes the self-calibration of the master and slave current sources, and can improve the accuracy of the current value output by the current source.

The invention relates to a device and a method for evaluating signals from one or more Wheatstone bridges. Here, the requirements of ISO 26262 are taken into account, a test signal is mixed with the measurement signal before amplification and before analog-digital conversion. After amplification and analog-digital conversion, the measurement signal is unmixed again with the test signal. If the test signal does not correspond to the expected value, a malfunction of the amplifier and / or the analog-digital converter is indicated. The advantage of this procedure is that it can be used during regular operation without being disturbed.

The invention discloses a low-temperature current comparator differential compensation device calibration system and method, and relates to the field of metering measurement, and the method comprises the steps: overturning the output current direction of a multifunctional calibrator, and obtaining the reading average value of a current compensation bit outputted on a standard resistor at the same time interval through a universal meter, determining a voltage effective value of the current compensation bit; determining the relative error of the current compensation position according to the voltage effective values of all the compensation positions under the current compensation gear and the corresponding compensation proportions thereof; calculating a compensation current correction value of the current compensation bit according to the relative error; and according to the compensation current correction value and an output compensation current value corresponding to the least significant bit of the digital-to-analog converter, determining a correction code value on the digital-to-analog converter corresponding to the compensation current correction value, and determining an output zero code value under the current compensation gear. The calibration cost can be reduced, and the operation is simplified.

A strain gauge assembly comprising: a strain gauge (10) comprising a plurality of resistive elements connected as a Wheatstone bridge or half Wheatstone bridge; an excitation signal generator (20) arranged to provide an excitation signal to two resistive elements of the strain gauge; phase shifting circuitry (30, 40) arranged to determine phase shifts in the excitation signal responsive to changes in resistance of the two resistive elements and an end stage (60) configured to output a measure indicative of the phase shift as an indication of strain on the assembly.