39results about "Ac/dc measuring bridges" patented technology

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 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.

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.

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.

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.

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.

Circuitry 1000 for characterising the impedance of a test load 402, e.g. the human skin, coupled between a sense node NS and a first driver node ND1, the circuitry comprising: a driver circuit 406 to

A contactless current sensing circuit for sensing current in a conductive wire on a dielectric substrate of a printed circuit board (PCB) includes a plurality of magnetic tunneling junction (MTJ) structures including first and second MTJ structures on a first side of the conductive wire, and third and fourth MTJ structures on a second side of the conductive wire opposite to the first side. The MTJ structures are located within the H-field induced by a current flowing through the conductive wire.

A current sensor includes a first busbar, a second busbar, and a third busbar, a first sensor unit, a second sensor unit and a calculating unit. The first, second and third busbars extend in a first direction apart from each other and are arranged in a second direction orthogonal to the first direction. Three-phase alternating currents flow through the first, second and third busbars. The first sensor unit is located between remaining two busbars other than one busbar to be measured among the first, second and third busbars. The second sensor unit measures one of the remaining two busbars other than the one busbar to be measured and is located between the one busbar to be measured and the other one of the remaining two busbars. The calculating unit calculates current values of the first, second and third busbars from output values of the first and second sensor units.

A high current source (200) for a test system for testing an electric power device (30) comprises a first plurality of first switchable half-bridges (212) and a second plurality of second switchable half-bridges (222), which are connected in parallel and by means of which a test current is redundantly distributed. A control device (280) is designed to control the first and second half-bridges (212, 222) on the basis of an input signal in such a way that an output signal for the test current, which corresponds to the input signal, is applied across a bridge branch (230) between the first switchable half-bridges (212) and the second switchable half-bridges (222).

Electronic device comprising a Wheatstone bridge circuit (PW) and a correction circuit (CC) coupled to the Wheatstone bridge circuit (PW), configured to correct a shift in the output voltage of the Wheatstone bridge (PW), characterized in that the correction circuit (CC) has an input interface (7) for receiving a first voltage, a supply module (1) configured to supply the Wheatstone bridge circuit (PW) with a second voltage derived from the first voltage and with a first current (11) regulated based on the current value of the resistors of the Wheatstone bridge circuit (PW), and to generate a second current (12) proportional to the first current (I1), and a digital-to-analog current converter (CNA) configured to provide a correction current at the outputs (2,3) to supply the Wheatstone bridge circuit (PW) from a digital correction signal (SNC) and the second current (12).

The invention discloses an impedance measurement device and method based on weak signal processing. The impedance measurement device comprises an impedance measurement bridge and a weak signal detection module. The impedance measurement bridge comprises an excitation source module, a range resistance module and a balance adjustment module; the weak signal detection module comprises a vector ratio acquisition unit, a multi-stage signal amplification unit, a clock synchronization unit and a plurality of analog-to-digital conversion units; the vector ratio acquisition unit is used for acquiring first analog voltage signals of to-be-measured impedances of different phases and second analog voltage signals of the range resistance module; the clock synchronization unit outputs a plurality of synchronous clock signals at equal intervals to the plurality of analog-to-digital conversion units; the plurality of analog-to-digital conversion units convert an analog voltage signal into a plurality of digital signals based on a plurality of equally spaced synchronous clock signals and output the digital signals. In the embodiment of the invention, signal extraction of the balanced bridge and noise suppression of multi-stage amplification are combined, and fidelity detection of weak voltage signals in strong noise is realized.

Device comprising the following: a switch (11, 40, 51) with a control terminal (14), a first load connection (12) and a second load connection (13), a magnetoresistive sensor (15, 25, 26, 35, 41, 515, 516, 534, 67) configured to measure a current flowing between the first load terminal (12) and the second load terminal (13), and a current mirror-based sensor (16, 52, 53, 533) for measuring the current between the first load terminal (12) and the second load terminal (13).

The invention discloses an impedance measurement device and method. The impedance measurement device comprises a signal source module, a range resistance module, an unbalance detection module and a measurement module, the signal source module comprises a first signal generation unit, a second signal generation unit, a first clock synchronization unit, a plurality of first digital-to-analog conversion units, a plurality of second digital-to-analog conversion units, a first signal output unit and a second signal output unit; the first clock synchronization unit is used for respectively outputting a plurality of synchronous clock signals at equal intervals; the plurality of first digital-to-analog conversion units are used for converting the digital signal output by the first signal generation unit into a plurality of first analog signals based on a synchronous clock signal; the first signal output unit is used for synthesizing the plurality of first analog signals into a first signal source; the measurement module is used for detecting voltage signals of the impedance and range resistance module to be measured, two paths of synchronous and consistent signal sources are generated through the signal source module with the first clock synchronization unit, and the excitation precision of the balanced bridge is improved.

A magnetic sensor comprises at least one bridge circuit and a plurality of magnetoresistive elements. The at least one bridge circuit comprises a first resistance section, a second resistance section, and a third resistance section. Each of the magnetoresistive elements comprises a magnetization-fixed layer with a magnetization whose direction is defined. The plurality of magnetoresistive elements comprises first, second, and third magnetoresistive elements, each forming first, second, and third resistance sections, respectively. The magnetization directions of the magnetization-fixed layer of the first magnetoresistive element, the magnetization directions of the magnetization-fixed layer of the second magnetoresistive element, and the magnetization directions of the magnetization-fixed layer of the third magnetoresistive element intersect at angles other than 0 degrees and 180 degrees.

The application discloses an improved device for conductor online measurement of direct current resistance, and relates to the technical field of electrical measurement, comprising a digital display bridge and a clamp mechanism, wherein the clamp mechanism comprises a linear slide rail, a moving seat is arranged on the linear slide rail, a clamp arm mechanism is arranged at the top end position of the moving seat, a locking mechanism is arranged between the moving seat and the linear slide rail, a locking driving mechanism is arranged at the bottom of the inner cavity of the moving seat, and a blocking mechanism is arranged at the top of the inner cavity of the moving seat and is driven to move up and down by the locking driving mechanism. The locking driving mechanism and the blocking mechanism are arranged between the locking mechanism and the clamp arm mechanism on the moving seat, so that the clamp arm mechanism can clamp the conductor, the sequential control between the locking mechanism and the clamp arm mechanism is established, the damage of the conductor caused by misoperation is avoided, and the accuracy of the positioning of the conductor measurement position is ensured.

Method for determining a load current (Iload) which comprises the following steps: - Passing the load current (Iload) through a first branch of a measuring resistor group and simultaneously through a second branch of the measuring resistor group parallel to the first branch, wherein the first branch has a first measuring resistor (R1) and a second measuring resistor (R2) in series with it, and the second branch has a third measuring resistor (R3) and a fourth measuring resistor (R4) in series with it, - simultaneous measurement of a first voltage (Utot) and a second voltage (Uy) across the entire measuring resistor group with only a load current (Iload) flowing through it, and - Calculating a correction value (a) based on the first voltage (Utot) and the second voltage (Uy), - the procedure consists of the following steps exclusively during the respective calibration periods: - Introducing a calibration current (Iref) with a known current strength into the measuring resistor group at a first point (P1) which is located between the first measuring resistor (R1) and the second measuring resistor (R2), and - Measuring a third voltage (Uy) between the first point (P1) and a second point (P2), wherein the second point (P2) is located between the third measuring resistor (R3) and the fourth measuring resistor (R4), while the calibration current (Iref) flows through it, - where the load current (Iload) is calculated based on the first voltage (Utot), the third voltage (Uy), the current of the calibration current (Iref) and the correction value (a).

This disclosure provides an interconnect structure impedance measurement circuit. By optimizing the Wheatstone bridge structure, it employs three parallel branches. In one branch, the interconnect structure to be measured is connected in series. In the other two branches, two resistors are connected in series. By controlling the branch containing the interconnect structure and one of the other two branches to be simultaneously turned on, the voltage between the two turned-on branches is measured. The impedance of the two interconnect structures is calculated based on the current flowing into the interconnect structure impedance measurement circuit, the measured voltage, and the resistance in the branches. This disclosure allows for convenient, large-scale, and accurate measurement of interconnect structure impedance, and enables real-time and accurate monitoring of the impedance of a single interconnect structure in reliability experiments. This disclosure also provides an interconnect structure impedance measurement device and method.

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.

Amplifying the tap voltage from a measuring bridge is readily achievable electronically, but resolution and measuring range width are somewhat contradictory: the wider the measuring range required for a measurement project, the lower the achievable resolution. Conversely, the higher the desired resolution, the smaller the measuring range within which it can be achieved. Therefore, there is often a need to extend measuring ranges without sacrificing resolution. Voltage dividers can be used as extensions to measuring bridges, creating half-measuring bridges that—like the voltage dividers alone—represent functional halves of the sensor measuring bridge. This allows the task of the sensor measuring bridge to be divided into several subtasks. If partial measuring ranges are then located side-by-side on this basis, measuring range extensions can be achieved while maintaining high resolution. This results in a total measuring range, which is characterized by the measuring range widths of the partial measuring ranges and by the number of partial measuring ranges. In this way, it is possible to divide a larger measuring range into small, adjacent sub-measuring ranges or to combine large measuring ranges with high resolution.