An invention that reduces an influence of dv/dt noise generated by power switching elements around a Rogowski current sensor. By separating a coil into two coils and connecting voltages generated from the two coils in series in a reverse direction, a total amount of parasitic capacitance is reduced by ?, and accordingly, Cp*dv/dt noise is reduced. The Rogowski sensor including a first coil (Coil-P) which detects a portion of a switching current passing through bus bars (20a, 20b) and includes a first end and a second end, and a second coil (Coil-N), as a coil separated from the first coil, which detects a portion of the switching current passing through the bus bar and includes a first end and a second end, wherein the second end of the first coil is connected to the second end of the second coil to form a neutral point (123).

Aspects of the present disclosure analyzing one or more signals that include both uncorrelated random signals as well as correlated information pertaining to electrochemical and/or electrodynamic processes occurring within a battery, characterizing the battery for charging, discharging, storage and other uses and/or controlling charging, discharging and other aspects of battery management based on the same.

A wearable measurement system includes a voltage measurement apparatus and a conversion coefficient acquisition apparatus, and measures a ground voltage of electromagnetic noise generated in a cable. The voltage measurement apparatus includes a lower electrode, an upper electrode arranged opposite to the lower electrode, and a voltage measurement circuit connected between the lower electrode and the upper electrode. The conversion coefficient acquisition apparatus includes a first lower electrode, a second lower electrode arranged side by side at the same height as the first lower electrode, an upper electrode arranged opposite to the lower electrodes, a voltage measurement circuit connected between the lower electrode and the upper electrode, and an oscillation circuit connected to the lower electrode and the upper electrode and outputting a signal of a predetermined frequency. The lower electrodes of the voltage measurement apparatus and the conversion coefficient acquisition apparatus have a container shape.

Differential sampling circuits may be adversely affected by changes in common mode voltage. Changes in the common mode voltage may alter the on resistance of transistor switches which it turn may mean that small signal changes are not correctly observed against a bigger common mode signal. The present disclosure relates to a way of improving the ability to resolve small differential signal changes by varying the supply or drive voltage to a component to compensate for common mode voltage changes.

A measuring apparatus is provided for electrical signals. The measuring apparatus includes an analog-to-digital (A/D) converter configured to A/D-convert an analog signal to be measured, and an integrator configured to perform integration time processing for a plurality of digital values output from the A/D converter based on an integration time. The integrator is configured to output a plurality of measured values obtained by the integration time processing. A noise level calculation unit is configured to calculate a noise level of the analog signal to be measured from the plurality of measured values obtained by the integration time processing, and a display unit is configured to display noise levels corresponding to a plurality of integration times.

By configuring low-pass filters each with a resistor and a capacitor, noise is removed. Based on a reference value of DC voltage that appears at output terminals of a battery pack circuit, a lowering portion of capacitance that arises in the respective capacitors is estimated in advance, and a compensation value is included in the resistance value of the respective resistors such that the cutoff frequencies of the low-pass filters are within an intended range. Even when a high voltage is handled, the variance in cutoff frequencies can be prevented from arising and the noise in an unnecessary frequency domain can be adequately reduced.

An apparatus and method for detecting transient voltage at an electrical component of a circuit board is provided. The apparatus including a circuit including a comparator and a latch, wherein a first input of the comparator is electrically coupled to the electrical component, and the comparator receives a threshold voltage at a second input, where the comparator outputs either a high signal or a low signal in response to both the first input and the second input, and an output of the comparator is electrically coupled to an input of the latch such that the latch outputs a high signal in response to receiving a high signal from the comparator, and an indicator electrically coupled to an output of the latch, and where the apparatus is mounted non-permanently to the circuit board to provide a non-permanent electrical coupling between the comparator and the electrical component.

A short-circuit protection and localization circuit for power devices includes a first subcircuit for detecting dv/dt of a power device at turn on, a second subcircuit for short-circuit fault localization and soft turn-off of the power device, the second subcircuit including a totem-pole driver having an upper switch and a lower switch, and a third subcircuit for detecting short-circuit faults based on the output (V.sub.dip) of the first subcircuit and the output of an upper switch (V.sub.p) of the second subcircuit. The first subcircuit outputs a voltage (V.sub.dip) having a magnitude that is proportional to dv/dt of the power device. The third subcircuit outputs a signal (V.sub.sto) to the second subcircuit that causes the second subcircuit to softly turn-off the power device. The second subcircuit outputs a voltage of the upper switch (V.sub.p) and a fault-latching signal for short-circuit localization.

A voltage sensor housing includes a top portion including a conductive top portion composed of conductive material and non-conductive top portions composed of non-conductive material, a bottom portion composed of non-conductive material, side portions composed of non-conductive material, wherein the top portion the bottom portion and the side portions define an interior area structured to hold a voltage sensor, and conductive side portions composed of conductive material and being disposed adjacent to the side portions. The conductive top portion is electrically floating and the conductive side portions are electrically grounded.

The present disclosure relates to a method and a device for reconstructing a useful signal from an acquired signal made up of a plurality of samples representing physical quantities measured. The acquired signal includes the useful signal made noisy by a noise. The method includes decomposing the acquired signal on a predetermined wavelet decomposition base according to a given number of decomposition levels, and obtaining corresponding wavelet coefficients representing the acquired signal. The method further estimates a value representing the standard deviation of the noise from at least one portion of the wavelet coefficients; and implements an iterative method for reconstructing parsimonious signals on the acquired signal with a dictionary built from the wavelet decomposition base. The iterative method has an associated stop criterion that is calculated as a function of the value representing the estimated noise.