Abstract: According to one embodiment, the power circuit includes a first feedback loop which feedbacks information on an output voltage and a second feedback loop which feedbacks information on a load current. When the load current is smaller than a predetermined threshold value, the second feedback loop is blocked and a PWM signal is generated using data of a feedback current signal which is stored before blocking the second feedback loop.

Abstract: System and method for adaptively altering a power supply's dead time. A method comprises detecting a start of a dead time, detecting an ending condition of the dead time, and ending the dead time. The detecting of the ending condition is based on a first current flowing through a lower portion of the power supply or a second current flowing through a gate driver of a lower switching element in the power supply.

Abstract: A circuit for DC-DC conversion with current limitation comprises a DC-DC converter (100) with a coil (110) and a controllable switch (120) that can be switched into a low-impedance and a high-impedance state, and a current limiter (300a, 300b) for generating a control signal (IOC) for controlling the state of the controllable switch in the DC-DC converter (100). The current limiter (300a, 300b) is constructed such that the current (IL) through the coil at which the current limitation takes place is nearly independent of the ratio of the on-times and off-times of the controllable switch in the DC-DC converter (100).

Abstract: A reference voltage generating circuit comprising a first bandgap voltage source arranged to output a first bandgap voltage exhibiting a first type deviation in response to a strain applied at die level in a given direction; a second bandgap voltage source arranged to output a second bandgap voltage exhibiting a second type deviation in response to a strain applied at die level in the given direction, said second type deviation being opposite to the first type deviation of the first bandgap voltage; and an adding circuit arranged to add the first bandgap voltage and the second bandgap voltage, and to output a temperature drift and strain drift compensated reference voltage.

Abstract: According to one embodiment, there is provided a power-supply circuit including a substrate, a chopper circuit, a conductive member, first capacitative elements, and second capacitative elements. The substrate includes a mounting surface. The chopper circuit is provided on the mounting surface, includes input ends, output ends, and a switching element, and converts a voltage input from the input ends and outputs the voltage from the output ends according to switching driving of the switching element. The conductive member is adjacent to at least a part of the chopper circuit. The first capacitative elements are electrically connected between the input ends and the conductive member and capacitively couple the input ends and the conductive member. The second capacitative elements are electrically connected between the output ends and the conductive member and capacitively couple the output ends and the conductive member.

Abstract: A mobile current measurement apparatus, a current measurement terminal, and a current measurement method are provided. More particularly, the present disclosure provides a mobile current measurement apparatus, a current measurement terminal, and a current measurement method capable of measuring a current of a Device-Under-Test (DUT) by using a wireless short distance communication. The method of measuring a current by a current measurement apparatus includes detecting a voltage converted from a current of a device-under-test, compensating the detected voltage by using a voltage offset generated by an amplifier of the current measurement apparatus, and measuring the current of the device-under-test based on the compensated voltage.

Abstract: A current sensor to be connected in series with a power semiconductor device between a voltage supply terminal and ground. The current sensor includes a first terminal to be coupled to the power semiconductor device, a second terminal to be coupled to one of the voltage supply terminal and ground, and a current mirror. The current mirror includes a first MOSFET and a second MOSFET each having a source, a drain, and a gate. The source of the first MOSFET is connected to the source of the second MOSFET and to the second terminal, the drain of the first MOSFET is connected to the first terminal, and the gate of the first MOSFET is connected to the gate of the second MOSFET.

Abstract: A method and a control system for a multiphase-phase inverter system, the control system comprising an electric current detection circuit and a processor, wherein each phase of an electrical cycle is separated into a plurality of sections, inputs from the electric current detection circuit are received, each input indicating a measured phase current, and a phase current is calculated in each section, wherein the phase current calculation in at least one of the sections is determined from a changing ratio of the value of the phase current calculated from the measured values of the other phase currents in the multiphase system and the measured value of the phase.

Abstract: An improved measurement circuit includes a current transformer and an active feedback circuit operated as a negative resistance that matches the value of the winding resistance of the current transformer. An amplifier in the feedback circuit provides power to drive a secondary current through a sense resistor and the transformer winding resistance, reducing the most significant error source in a current transformer circuit by presenting a negative impedance to the current transformer. Combined with the positive resistance of the transformer's winding, the negative impedance results in a net burden of zero on the current transformer, which eliminates the need for the transformer having to provide power to drive the secondary current. This facilitates the use of smaller transformers while achieving reduced measurement errors. Thus, a single, compact measurement device may be used in a wide range of applications with high measurement performance.

Abstract: A system may include two input terminals, e.g., HI and LO, and a floating circuit that is physically separate from the input terminals and includes a gain amplifier. The floating circuit can be surrounded by a conductive enclosure that is electrically connected to the second input terminal. The floating circuit can further switch between input signals received from the first and second input terminals to the gain amplifier and the floating circuit ground.

Abstract: The invention provides a handheld digital voltmeter approximately the size and shape of a ballpoint pen. When its tip is placed on a live electrical wire, the Accu Volt Meter digitally displays a voltage reading on a small LCD screen and audibly states the voltage reading through an incorporated data to voice software program and a tiny incorporated speaker.

Abstract: A self-calibrating magnetic field monitor is disclosed. In one embodiment, a magnetic field sensor repeatedly generates an electronic signal related to the magnetic field. In addition, a calibration module generates a relative baseline signal based on an average value of the electronic signals for a given time period. A comparator compares the electronic signal with the relative baseline signal and generating an output signal if a difference in the comparing is greater than or equal to a threshold.

Abstract: An apparatus for measuring displacement is disclosed. The disclosed displacement measurement apparatus may include a magnet unit having magnet sub-units arranged repeatedly in a particular pitch (p) to generate a sine-wave magnetic flux density; a sensor unit including a sensor array for measuring the sine-wave magnetic flux density; and a measurement part configured to measure a displacement of the magnet unit and the sensor unit displaced relatively to each other, based on the measured value of the sine-wave magnetic flux density, where the sensor array comprises two or more sensors arranged separated by a gap of p/k in-between (where k is 2n, n is an integer greater than or equal to 1) along an arrangement direction of the magnet sub-units.

Abstract: The invention relates to a method for detecting changes of position of a shaftless spinning rotor (1) of an open-end spinning machine in a cavity of an active magnetic bearing, in which the position of the spinning rotor (1) is detected by a system of sensors (A, B) and on basis of the detected changes in the position of the spinning rotor (1) is adjusted controlling of the active magnetic bearing in order to eliminate undesirable changes in the position of the spinning rotor (1) in the cavity of the active magnetic bearing. Continuously is detected radial shifting of the spinning rotor (1) and simultaneously is continuously detected inclination of the spinning rotor (1), whereupon according to the detected changes in the position of the spinning rotor (1) is determined shifting and/or inclination of the spinning rotor (1) which is used for subsequent adjustment of the controlling of position of the spinning rotor (1) in the active magnetic bearing.

Abstract: A device for detecting position of a rotating working means in an active magnetic bearing which comprises sensors (A, B) of the position of a rotating working means, detectors (D) of an output signal of the sensors (A, B) and evaluation circuits connected to control system of the active magnetic bearing. The sensors (A, B) of the position are composed of high frequency transformers, each of which is directly connected to the detector (D) of its output signal and the detectors (D) are composed of an electrical quadrupole with a non-linear transfer characteristic.

Abstract: To make the magnetic field lines straighter and more parallel to one another, the present disclosure makes use of substantially square magnets with through-holes therein. It will be appreciated that “substantially square” magnets include magnets that are precisely square as well as magnets that are approximately square (e.g., have rounded corners or other small deviations from being square.) By providing straighter and more parallel magnetic field lines, such substantially square magnets tend to enable greater precision and accuracy when rotational angles of a shaft are measured.

Abstract: Detection of the rotation angle of a magnetic field using a magnetic sensor in which two sensor units are arranged at a predetermined angle with respect to each other is performed with a resolution of an angle smaller than 45° with a simple circuit configuration. A detection circuit is connectable to a magnetic sensor in which first and second sensor units are arranged, at a predetermined angle with respect to each other, each sensor unit having a bridge circuit of magnetoresistance elements. The detection circuit includes a first comparison circuit that compares output signals of the first or second sensor unit, a second comparison circuit that compares an output signal of the first sensor unit with an output signal of second sensor unit, and a rotation angle calculation circuit that calculates a rotation angle of a magnetic field based on the comparison results of the first and second comparison circuits.

Abstract: A fluxgate sensor including a magnetic-to-digital converter (MDC) can be adapted to measure an external magnetic field BEXT with a bandwidth fB. The MDC forward path can include: (a) converting an analog sense signal from the fluxgate sense coil to corresponding oversampled digital data using an oversampling data converter with an oversampling frequency fS greater than fB; and (b) loop filtering the oversampled digital data, synchronous with the oversampling frequency fS, to generate the loop output digital data. The MDC feedback path can include: (a) generating the feedback compensation current ICOMP from the loop output digital data, synchronous with a feedback path frequency fFB equal to ((M/N)×fS), where, M and N are integers; and (b) injecting the feedback compensation current ICOMP into the fluxgate compensation coil to induce the compensation field BCOMP, such that the induced compensation field BCOMP nulls the external field BEXT.

Abstract: A petrophysically regularized time domain nuclear magnetic resonance (NMR) inversion includes using an NMR tool to acquire NMR data and inverting the acquired NMR data in a time domain using petrophysical constraints. The inverted NMR data is analyzed. The petrophysical constraints may be identified by: determining a number of porobodons to seek, defining a plurality of zones in which only a subset of porobodon sets is present, and stacking all NMR echoes in each zone satisfying discriminators. The number of porobodons to seek may be based on knowledge of core samples, logs, and NMR sensitivity. The discriminator logs may be logs sensitive to porosity partitioning. A computing system having a processor, a memory, and a program stored in memory may be configured to perform the method. The system may be conveyed downhole on a wireline, a while-drilling drill string, a coiled tubing, a slickline, or a wired drill pipe.

Abstract: The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

Abstract: The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

Abstract: In an RF excitation method and device for a magnetic resonance imaging system, the RF pulses are emitted in a STEAM sequence, the STEAM sequence including, in time order, a first 90-degree excitation pulse, a second 90-degree excitation pulse and a third 90-degree excitation pulse. Gradient pulses are activated that act in cooperation with the STEAM sequence, the gradient pulses including, in time order, a first gradient pulse, a second gradient pulse and a third gradient pulse. Each of the gradient pulses is activated simultaneously with the corresponding RF pulse. The direction of each of the gradient pulses is the vector sum of multiple gradient pulses in different directions, the directions of any two of the gradient pulses being the same and intersecting with the direction of another of the gradient pulses.

Abstract: In a method and apparatus for time-resolved phase-contrast magnetic resonance (MR) imaging with speed encoding, MR signals are detected with multiple receivers in each of numerous time segments in order to acquire raw data in each of the time segments, in each case for numerous MR images with different speed encodings. Stationary image points and/or non-stationary image points are identified, dependent on the detected MR signals. A mask is defined, dependent on the identified stationary image points and/or the non-stationary image points, wherein the mask is locally variable. The numerous MR images for the numerous time segments are reconstructed from the acquired raw data, wherein the reconstruction occurs in an iterative process and with a temporal regularization, which is dependent on the mask.

Abstract: In a method and magnetic resonance system to determine multiple magnetic resonance images for respective different echo points in time, k-space is scanned on a segment-by-segment basis with at least two rectangular k-space segments, these being scanned line by line with respective k-space lines oriented parallel to one another. A short side of the rectangular k-space segments is oriented parallel to the k-space lines. First and second gradient echoes are respectively produced by a radio-frequency pulse radiated for each k-space line.

Abstract: The present invention relates to a constant gradient field nuclear magnetic resonance (NMR) rock sample analysis method and instrument.

Abstract: In magnetic resonance (MR) thermometry, first and second magnetic resonance data that are acquired sequentially, from which a phase shift is determined between a measurement phase and a reference phase. In a first region of an examined person, the measurement phase is determined from the second magnetic resonance data and the reference phase is determined from the first magnetic resonance data. In a second region of the examined person, both the reference phase and measurement phase are determined from the second magnetic resonance data. Techniques for reference-based magnetic resonance thermometry and reference-free magnetic resonance thermometry can be applied.

Abstract: The present invention provides an apparatus and a corresponding method useful for electron paramagnetic resonance imaging, in situ and in vivo, using high-isolation transmit/receive (TX/RX) coils, which, in some embodiments, provide microenvironmental images that are representative of particular internal structures in the human body and spatially resolved images of tissue/cell protein signals responding to conditions (such as hypoxia) that show the temporal sequence of certain biological processes, and, in some embodiments, that distinguish malignant tissue from healthy tissue. In some embodiments, the TX/RX coils are in a surface, volume or surface-volume configuration.

Abstract: A signal analyzer for nuclear magnetic flowmeters is provided. The signal analyzer can be placed in a power signal path between a signal generator that generates an electric excitation signal and an electrical load. The signal analyzer includes a power signal line in the power signal path for the transmission of electrical signals. The signal analyzer also includes a decoupling circuit for decoupling a first signal characterizing the excitation signal occurring in the load and for decoupling of a second signal characterizing the part of the excitation signal reflected at the load. The signal analyzer further includes a first attenuator and a second attenuator. Additionally, the signal analyzer includes a detector for determining the ratio of the magnitude of the first signal to the magnitude of the second signal and for determining the phase difference between the first signal and the second signal.

Abstract: An apparatus (100) protects a device (80) which has a ferrous electromechanical component which saturates in a high magnetic field (40) and draws a dangerously high electric current. A current sensor (110) senses current in excess of safe operating conditions of the protected device (80) in or near the magnetic field (40). A current switch (120) is controlled by the current sensor (110) and interposed between a power supply (90) and the device (80) to interrupt the current flow to the protected device (80) when the current sensor (110) senses current flow above a threshold due to the saturation.

Abstract: A gradient coil system has a cylindrical section in a central region, which contains no conductor elements and has a maximum outer radius that is larger than a minimum inner radius of conductor elements of a main gradient coil. An outer radius of this cylindrical section is only insubstantially smaller or equal in size to a minimum inner radius of a shielding coil in this axial range. The free space in the center of the gradient coil system is used to insert a passive RF shield, whose radius in a central region becomes larger over a certain length than its radius in outer regions. The RF shield is constructed from at least three partial sections, which are electrically interconnected. The actively shielded gradient coil system maximizes the volume of the RF region without loss of gradient coil system performance.

Abstract: A shielding for a magnetic resonance tomography device, in the form of a shell of a cylinder, for arrangement radially between a radially outer gradient coil system for generating a magnetic field gradient in an examination space of the MRT device and a radially inner RF coil system for sending and/or receiving RF signals into the examination space and from the examination space, is provided. The shielding includes strips that are arranged on a shielding surface, are electrically conductive and are separated from one another by slits. The strips have respectively angled and/or rounded profile segments to create a two-dimensional pattern of shielding rings on the shielding surface.

Abstract: A ground tracking system including a ground follower assembly for use with a locator or other device for determining position, motion, and/or orientation information is disclosed. The ground follower assembly may include a wheel assembly coupled to a locator and configured to swivel and/or pivot relative to an antenna node of the locator to generate signals for use in determining position information during a locate operation, such as from a sonde array.

Abstract: An apparatus includes a sub with recesses along an exterior wall to receive inserts, an antennae case including a coil surrounded by a sacrificial wear portion of a material through which signals between the coil and a formation of interest may pass. An eroded outer wall of the sacrificial wear portion is restorable by application of an uncured restorative material to the antennae case. A method includes securing an antennae case having a coil there within onto a sub, surrounding the coil with a metal sleeve shield, and radially receiving and securing a multi-piece sacrificial wear member intermediate the antennae case and a retainer ring having a threaded bore. The multi-piece sacrificial wear member is replaceable after use by unthreading the retainer ring to release the sacrificial wear member for radial removal from the sub.

Abstract: A system and apparatus for configuring a well logging assembly having an elongate sub with a bore therethrough, a leading end connection and a trailing end connection, a plurality of sets of recesses in an exterior wall of the sub to receive a plurality of sets of inserts, each having a threaded exterior surface, a plurality of internally threaded retainer rings, and a plurality of well logging devices securable to the exterior wall of the sub using the retainer rings to threadably engage the inserts received in the recesses. The system enables convenient configuration and reconfiguration of the well logging assembly by enabling convenient securing of a first well logging instrument to the sub at a variety of spacings from a second well logging instrument to provide a variety of depths of investigation into a geologic formation penetrated by a drill string containing the well logging assembly.

Abstract: A method and apparatus is provided for bucking a magnetic field of known geometry and time variation by means of a plurality of bucking loops. It utilizes multiple loops, each of which is energized by an electric current that creates a magnetic field of the known time variation. The multi-loop field forms a bucking magnetic field that better opposes the spatial variation in the known magnetic field over a volume than can the magnetic field from a single loop. The present invention is useful in electromagnetic measurements, where the magnetic field of a controlled source transmitter must be annulled at a magnetic field sensor. It is particularly useful for cases where the magnetic sensor may move relative to the transmitter, such as in certain airborne electromagnetic measurements.

Abstract: This application relates a method and a control circuit for determining a charge current of a battery connected to a modulated load, wherein a current limited power source is connected in parallel to the modulated load and the battery for supplying a load dependent current up to a predetermined current limit to the modulated load and the battery. The control circuit comprises means for measuring a current flowing through the battery; means for indicating an overload condition of the current limited power source; and means for determining the charge current of the battery. The means for indicating an overload condition are configured to indicate an overload condition when a sum of a current drawn by the modulated load and a current flowing into the battery exceeds the predetermined current limit of the current limited power source.

Abstract: A method for inspecting a battery, comprising: a first withstanding voltage determination step of housing an electrode laminate within a package and applying a first voltage between a positive electrode terminal and a negative electrode terminal to perform a first withstanding voltage determination in a state in which an electrolyte solution is not poured in the package; and a second withstanding voltage determination step of applying a second voltage which is higher than the first voltage between the positive electrode terminal or the negative electrode terminal and metallic layers of pair of laminate films to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package.

Abstract: A method for checking a control pilot, referred to below as CP, line of a charging socket of an electrically drivable transportation means. The method includes closing the charging socket, as a result of which an electrical, in particular galvanic, connection is closed between the CP line and a line of the charging socket providing electrical energy, and checking a signal received via the CP line in response to the closing. Also disclosed is a corresponding apparatus.

Abstract: After turning on a switching element by receiving a discharge command from a motor ECU via a control circuit, a drive circuit of a discharge device causes, upon receipt of an overheat protection command from an overheat protection circuit, the switching element to turn off and keeps the resulting state thereof. And, the motor ECU sends the discharge command, after establishment of a diagnostic condition, to the control circuit of the discharge device and determines that the discharge device is abnormal if an electric current will not flow through a discharge resistor and the switching element.

Abstract: A built-in self test (BIST) circuit and method is provided to test a first and a second DLL. The first DLL has a first delay input, a first clock input disposed to receive a clock input signal, and a first clock output that provides a first clock output signal delayed in comparison with the clock input signal. The second DLL has a second delay input, a second clock input disposed to receive the clock input signal, and a second clock output signal delayed in comparison with the clock input signal. The BIST circuitry provides a first delay amount over the first delay input creating a start offset between the first and second clock output signals. If the first DLL is functioning properly the start offset between the output signals should remain unchanged even after the BIST circuitry provides an additional common delay amount to the first and second delay inputs.

Abstract: A method of preventive detection of a fault in at least one device under surveillance of a group comprising at least two devices, the device under surveillance having at least one first parameter correlated with at least one second parameter of at least one second device in the group, said parameters representing state variables of said devices. The method includes the following steps: predicting a value of the first parameter from a measured value of the second parameter; comparing the predicted value of the first parameter and a measured value of the first parameter; and analyzing the result of the comparison effected in the comparison step to detect a potential fault. The invention also relates to a computer program, an installation, and a module for preventive detection of a fault in a device.

Abstract: In a component-embedded circuit substrate having a plurality of capacitors embedded therein, the capacitors are connected in parallel, inspection electrodes are formed, and the inspection electrodes connect to respective terminal electrodes of the capacitor through via conductors. At the terminal electrodes of the capacitor, the connection position of the via conductors for connecting the inspection electrodes differs from the connection position of via conductors for connecting respective terminal electrodes of the capacitor.

Abstract: An electrical insulating property tester includes a guaranteed voltage applying unit for applying a guaranteed voltage to a running line provided with an electrical insulating layer around an electrical conducting wire, a grounding unit arranged downstream of the guaranteed voltage applying unit, for grounding the running line to thereby remove electric charge electrostatically induced on the running line, and a test voltage applying unit arranged downstream of the grounding unit, for applying a test voltage lower than the guaranteed voltage to the running line, to thereby detect a leakage current value.

Abstract: Systems, apparatus and methods for designing and operating a cell-electrode impedance sensor to detect chemical and biological samples, including biological cells. In one implementation, a method of designing a cell-electrode impedance sensor includes determining a cell free cell-electrode impedance and a cell covered cell-electrode impedance based on a design model for the cell-electrode impedance sensor, wherein the design model is based on one or more factors, the factors including properties and elements of a cell-electrode impedance measurement system, using the cell free cell-electrode impedance and the cell covered cell-electrode impedance to obtain a sensor sensitivity of the cell-electrode impedance measurement system, and choosing one or more design parameters of the cell-electrode impedance sensor in the cell-electrode impedance measurement system to maximize the sensor sensitivity.

Abstract: A system may include at least one sensor configured to detect at least one vital signal, wherein the sensor is positioned proximate to a driver within a vehicle seat. At least one contact element may be configured to detect at least one reference signal, wherein the contact element surrounds a vehicle steering wheel. At least one resistor may be coupled to the at least one sensor and configured to receive the reference signal from the contact element.

Abstract: A sensor array for detecting the approach and movement gestures of a user at a motor vehicle includes a capacitive sensor array and at least one control device that is coupled to the sensor array and detects a change in the capacitance of the sensor array. The sensor array includes at least two sensor electrode arrays which are arranged at spatially offset positions on the motor vehicle. The sensor electrodes are configured as elongate electrode arrays and are arranged with the same spatial orientation. The control and evaluation device is designed for cyclical activation and evaluation of the sensor electrodes with changeable, electrode-specific, different cycle rates.

Abstract: A socket capable of detecting an approaching object, which is used to be electrically connected to a mains supply and comprises a relay (200), a socket base (300), a capacitance sensing circuit (400), and a detection electrode (500). The relay (200) is electrically connected to the mains supply. The socket base (300) is electrically connected to the relay (200) and provided with two insertion holes (320) having strip shapes and arranged in parallel. The capacitance sensing circuit (400) is electrically connected to the relay (200). The detection electrode (500) is electrically connected to the capacitance sensing circuit (400). Thus, the approaching object can be detected and the power supply from the mains supply for the insertion holes (320) can be stopped.

Abstract: A capacitive detection type electro-mechanical transducer comprises; a cell formed by a first electrode arranged on a substrate and a second electrode arranged on a vibration film, and a detection circuit for detecting a displacement of the vibration film, based on a capacity change between the first and second electrodes, wherein a plurality of the cells are classified into a plurality of groups, each one includes at least two cells, and the first electrodes or the second electrodes of the cells of the same one group are commonly connected to the same one detection circuit, and an addition circuit for adding, into single information, signals from the plurality of detection circuits corresponding to the plurality of groups, and for outputting the information, and a capacitive load for each one of the detectors are formulated to be dispersedly arranged.

Abstract: An integrated circuit compensates for parasitic capacitance in a capacitive measuring apparatus wherein a capacitance measurement is done by repeatedly transferring charge from a capacitor to be measured to a reference capacitor.

Abstract: The invention refers to a chamber for measurements of electrical properties of reactive powder or liquid samples, allowing the measurement of various electrical parameters to be carried out. The present invention provides the chamber in two variants of embodiment: the multiple use chamber and the single use chamber. The construction of the chamber provides the possibility of carrying out the measurements with the sample placed directly between parallel active surfaces of the electrodes placed coaxially and sliding in a precise manner in to a thin-walled cylinder made of insulating material providing electric insulation. Elements remaining in contact with the sample are made of chemically inert materials. Additionally, a module containing a pair of the electrodes and the cylinder made of insulating material is detachable from the rest of device elements, that enables its loading and hermetic closure in a glovebox filled with inert gas.