A testing method for carrier mobility of insulating polymers is provided, which is based on a testing device for carrier mobility of insulating polymers, including a first box; a second box, disposed inside the first box, provided with a partition plate, and defining a first space and a second space through the partition plate; a sample frame, configured to fix a sample, and disposed in the first space; an X-ray source, disposed in the second space, and configured to generate and emit X-rays to irradiate the sample, to excite generation of carriers in the sample; a voltage generation component, in line connection with the sample, to apply a triangular wave voltage to two ends of the sample, to thereby make the carriers generated in the sample move; and a current detection component, connected to the sample, to thereby collect current signals of the sample generated by movement of the carriers.

Techniques are provided for current collector diagnosis. In one embodiment, the techniques involve determining that a current is flowing through a current collector of the battery cell, generating a mechanical excitation to the current collector, determining an amplitude of the voltage across the battery cell based on the mechanical excitation, and determining a presence of a tear or a separation of a foil of the current collector based on the amplitude of the voltage across the battery cell.

Some embodiments describe a DC meter system that can be placed in-line between a power source and an electrical load. In some embodiments, the DC meter system includes a DC meter that has multiple inputs for receiving electricity from multiple power sources. In some embodiments, the DC meter has one or more outputs, each capable of delivering electricity to a different electrical load. In some embodiments, the DC meter can combine electricity from two or more of the multiple inputs into one of the outputs. In some embodiments, the DC meter has a controller that can enable a user to deliver electricity from a particular input to a particular output. In some embodiments, the DC meter is configured to enable transition of electricity between an input and an output in a bi-directional manner. In some embodiments, the DC meter can record an amount of electricity transmitted in either direction.

In an embodiment, an electronic circuit includes: one or more input terminals configured to receive measurement data; and a controller configured to: determine a first harmonic current based on a first current flowing through a first circuit coupled to a line node, where the measurement data includes first current data indicative of the first current, determine a filter harmonic current based on a filter current flowing through an AC filter coupled to the line node, where the measurement data includes filter current data indicative of the filter current, and generate a first flag indicative of failure, degradation or malfunction of a first capacitor or capacitor bank based on the first harmonic current and the filter harmonic current, where the AC filter includes the first capacitor or capacitor bank.

An electronic device may include an antenna, a receiver, and a transmission line path that couples the antenna to the receiver. A peak detector may receive a radio-frequency signal from the transmission line path and may output a DC voltage indicative of a peak voltage level of the signal. The peak detector may include a pair of square law transistors having source-drain terminals coupled to an output of the peak detector. The peak detector may include a differential pair of transistors coupled between a power supply voltage and the output. The peak detector may include diode-connected transistors coupled between the source-drain terminals and gate terminals of the square law transistors. The diode-connected transistors may cause noise current to flow along feedback loop paths from the source-drain terminals onto the gate terminals of the square law transistors. This may remove noise from the output of the peak detector.

A device and a method of sensing and compensating an overshoot voltage are disclosed. The device includes a power converter and an overshoot voltage compensation circuit. The overshoot voltage compensation circuit includes an overshoot voltage sensing circuit to generate a first comparison voltage by performing a filtering operation on the output voltage, and an overshoot voltage control circuit to generate a first control signal for controlling the operation of a power transistor based on the first comparison voltage. The first control signal may be a signal that controls the operation of the first power transistor to change a slope of a current flowing through an inductor included in the power converter versus time.

A magnetic field sensor for sensing a current flowing in a first direction divided in at least two conductor portions separated in a second direction, the sensor comprising at least two sensing elements for sensing the magnetic field at two positions in a region between the two conductor portions, wherein the at least two sensing elements are adapted to sense the field at the respective position with the highest sensitivity in a direction being between 20 degrees and 160 degrees from a third direction being perpendicular to both the first and second direction, wherein the two positions are separated by a predetermined distance in the third direction

A current sensor system for accurately measuring an AC electrical current having frequencies up to 2 kHz, the system comprising: an electrical conductor (e.g. busbar) for conducting said AC current thereby creating a first magnetic field; a magnetic sensor device for measuring a magnetic field component or gradient; an object (e.g. a metal plate) having an electrically conductive surface arranged in the vicinity of said conductor for allowing eddy currents to flow in said surface, thereby creating a second magnetic field which is superimposed with the first magnetic field; wherein the magnetic sensor device is configured for determining the current as a signal or value proportional to the measured component or gradient. The metal plate may have an opening. The current sensor system may further comprise a shielding.

Systems, methods, and computer program products are disclosed for cancelling a magnetic field in a passenger region of a vehicle. Cancelling a magnetic field in a passenger region of a vehicle includes a chassis, a passenger region of the vehicle, a current carrying loop (CCL) configured to carry electricity during vehicle operation, thereby generating a magnetic field configured to radiate toward the passenger region, a sensor associated with the CCL for sensing current passing through the CCL, an electrical wire loop spatially aligned with a physical path of the CCL, and a circuit configured to: receive current sensing data from the sensor, and based on the current sensing data, determine a cancellation electrical current for providing to the electrical wire loop in order to cause a cancelling magnetic field, thereby at least reducing magnetic radiation from the CCL to the passenger region.