Abstract: A system for checking the electrical insulation in converters for electric cars comprises at least one voltage generator connected to at least one line to be monitored of a high-voltage converter for electric vehicles and connected to the ground of said converter, and at least one current detection unit operatively connected to said voltage generator and configured to detect any current possibly present on the voltage generator and to generate a warning signal in the event of detection of the current.

Abstract: To enable early detection of AC insulation faults, or to permit easier, faster and more accurate measurement of small currents in inverters, a current measuring circuit for a converter is provided. The current measuring circuit has a positive supply rail, a negative supply rail, a reference potential rail and a current measuring device that contains a Y-capacitor and a current sensor connected in series therewith. The load current can be decoupled from the measurement current through the at least one Y-capacitor, so that at high load currents even small fault currents can be acquired reliably with the current sensor.

Abstract: Systems and methods for performing over-the-air verification tests for radar. A test chamber includes multiple sections, the sections separated by metal walls. The inner surfaces of the metal walls include absorbers. Each section includes defined testing devices to verify a defined function of a radar device. The defined testing devices can include a horn antenna and corner reflector. Each section has a defined number of rows. Each row has a defined testing device. Test fixtures hold a defined number of the radar devices in correspondence with the defined number of rows. The defined number of the radar devices placed on the test fixture via a placement device. A positioner to align under the sections and move the test fixtures through the sections of the test chamber and a controller to control operation of the positioner, the radar devices, and the placement device to execute over-the-air verification of the radar devices.

Abstract: The present invention relates to a method for determining a state of a capacitive voltage transformer which, on its primary side, comprises a capacitive voltage divider having a first capacitor and a second capacitor. The first capacitor has a high-voltage connection for connection to a high voltage and the second capacitor has a ground connection. A first resonant frequency is determined by way of a plurality of first short-circuit impedance measurements at different frequencies on a secondary side of the capacitive voltage transformer while the high-voltage connection is connected to earth. A second resonant frequency is determined by way of a plurality of second short-circuit impedance measurements at different frequencies on the secondary side of the capacitive voltage transformer while the high-voltage connection is open. A capacitance ratio of the capacitive voltage divider is determined on the basis of the first resonant frequency and the second resonant frequency.

Abstract: A system comprising an array of solar panels, each panel including an electronic control module, wherein the panels are all connected in electrical series with each other and to a switch and to a string inverter, may be signaled to power down each panel to a safe output at its output terminals. The method includes sensing output wave forms of a module to be the result of its own DC-DC converter output or to be at variance with the expected output. Output wave forms at variance indicate that the control module is connected in electrical series with the input capacitance of the string inverter. If the output is as expected, the control module is deemed to not be connected to the capacitance of the string inverter as a result of the electrical series switch being open. The module then immediately drives its output to a safe level.

Abstract: The present invention is directed to an electro-optical sensor for high intensity electric field measurement. The electro-optical sensor was used to measure a strong 118 MV/m narrow pulse width (˜33 ns) electric field in the magnetically insulated transmission line (MITL) of a pulsed power accelerator. Accurately measuring these high fields using conventional pulsed power diagnostics is difficult due to the strength of interfering particles and fields. The electro-optical sensor uses a free space laser beam with a dielectric crystal sensor that is highly immune to electromagnetic interference and does not require an external calibration.

Abstract: A circuit board includes an insulating substrate having a first surface and a second surface opposite to the first surface, a solid conductor located inside the insulating substrate, a first via conductor connected to the solid conductor from a side of the first surface, and a second via conductor connected to the solid conductor from a side of the second surface. The solid conductor has a cutout that intersects a line segment that connects a node of the first via conductor and a node of the second via conductor to each other.

Abstract: The present disclosure provides a method and system for creating dipole moment model. The method is applied to a tested circuit and includes: performing a near-field measurement on the tested circuit, to obtain a near-field electric field and a near-field magnetic field related to the tested circuit; performing a two-dimensional divergence calculation on the near-field electric field and the near-field magnetic field, to obtain a near-field electric divergence field and a near-field magnetic divergence field; performing a convolution calculation on the near-field electric divergence field and the near-field magnetic divergence field with a digital filter; and building a dipole moment matrix equivalent to the tested circuit according to a result of the convolution calculation.

Abstract: A display device includes a substrate in which a cut-out portion is defined, and a first conductive layer disposed on the substrate and including a first signal line and a first test line, where the first test line crosses the cut-out portion, and one end portion of the first test line includes a first pad region that is expanded.

Abstract: Described are systems and techniques for extracting frequency and voltage harmonic transients corresponding to individual load events. Such systems and techniques can be used to make electrical loads aware of the operation of other loads in an electric grid. Thus, awareness is achieved using information derived only from a utility voltage waveform at a load. Also described are systems and techniques for incorporating such awareness into load controllers which allows loads to autonomously meet system level objectives in addition to their individual requirements.

Abstract: An apparatus is provided that is implemented to enable multiple tests of different types, such as a direct current (DC) test and/or a radio frequency (RF) test of a semiconductor device. The apparatus includes a microelectromechanical systems (MEMS) switch block coupled between the semiconductor device and automatic testing equipment (ATE). The apparatus is configured to enable/disable a DC path or an RF path to switch between a DC test and an RF test without reconfiguring the connections between the semiconductor device and the ATE. The DC path is used to perform a DC contact test for one or more pins of the semiconductor device. The RF path is used to perform an RF test for the semiconductor device.

Abstract: An electronic device including a phase detector is provided. The phase detector includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a first equalizer device. The first transistor has a first input terminal configured to receive a first signal. The second transistor has a second input terminal configured to receive a second signal. The third transistor is electrically connected to the first transistor and has a first output terminal. The fourth transistor is electrically connected to the second transistor and has a second output terminal. The first equalizer device is connected between the first output terminal and the second input terminal.

Abstract: A socket for electrically connecting a first electrical component, the upper surface of which is pressed upon by a pressing member, and a second electrical component which is positioned below the first electrical component, said socket being equipped with: a socket main body which has a placement surface on which the first electrical component is placed; and a holding part which is provided to the socket main body, holds the first electrical component to the socket main body by engaging the first electrical component in a pressed state in which the first electrical component is pressed upon by the pressing member, and releases the engagement with the first electrical component when the pressing member moves a prescribed distance away from the position which corresponds to the pressed state.

Abstract: Provided are a mechanical property measuring apparatus and method that can accurately measure a mechanical property through physical quantities, etc. A mechanical property measuring apparatus (100) comprises: a physical quantity measuring unit (5) configured to measure a plurality of physical quantities of a measured object that includes a substance and a film on a surface of the substance; a calculation model generating unit (81) configured to select a plurality of pieces of learning data and generate a calculation model for calculating a mechanical property of the substance; and a mechanical property calculating unit (82) configured to calculate the mechanical property of the substance using the calculation model generated and at least two of the plurality of physical quantities, wherein the selection physical quantities include at least one physical quantity measured using a first measurement signal and at least one physical quantity measured using a second measurement signal.

Abstract: A rotor comprises a support intended to be mounted rotatable around a rotation axis in a centrifuge enclosure. The support having at least one housing for receiving the sample. At least one electrically powered sensor held by the support, configured to measure a property of the sample. A contactless power receiver, configured to receive electrical power without contact from a contactless power transmitter, the contactless power receiver being carried by the support and being jointly rotatable with the support, the contactless power receiver being electrically connected to the at least one sensor to electrically power the at least one sensor during a rotation of the support.

Abstract: Disclosed is a non-invasive online monitoring circuit for an on-state saturation voltage of a power semiconductor, including one or more basic units; each basic unit includes a normally-ON switching device, a diode, and a clamping voltage supply; a gate of the normally-ON switching device is connected to a positive electrode of the clamping voltage supply; the positive electrode of the diode is connected to a source of the normally-ON switching device, and a negative electrode of the diode is connected to the gate of the normally-ON switching device; the drain of the normally-ON switching device and the negative electrode of the clamping voltage supply serve as input terminals of the monitoring circuit for accessing the power semiconductor under test; and the source of the normally-ON switching device and the negative electrode of the clamping voltage supply serve as output terminals of the monitoring circuit.

Abstract: A semiconductor device includes a temperature sensor circuit having a sensor element, internal circuits, sensor terminals connected to the sensor element, and normal terminals connected to the internal circuits. A semiconductor inspection apparatus inspects, by using a probe card having first probes and second probes, the semiconductor device mounted on a stage in a first state in which the first probe is in contact with the sensor terminal and the second probe is not in contact with the semiconductor device and in a second state in which the first probe is in contact with the sensor terminal and the second probe is in contact with the normal terminal. The semiconductor inspection apparatus measures an output value of the sensor element in the first state to calculate temperature characteristics of the sensor element, and grasps a temperature of the sensor element in the second state based on the temperature characteristics.

Abstract: A detection system for detecting an electrical discharge in an electrical apparatus includes a first sensing device that senses an acoustic wave and an electromagnetic wave and generates a first combined signal. A signal processing device processes the first combined signal and determines the occurrence and properties of an electrical discharge.

Abstract: Embodiments of this application disclose a design of an inverter and a design of a combiner box, to reduce maintenance costs of a photovoltaic device. According to the inverter or the combiner box provided in the embodiments of this application, when electroluminescence (EL) defect detection is performed on the photovoltaic device, a reverse charging circuit integrated into the inverter or integrated into the combiner box is used to output a direct current to a to-be-tested photovoltaic string of the photovoltaic device. Whether the to-be-tested photovoltaic string has defects is determined based on a light emission status of the to-be-tested photovoltaic string. By using the foregoing designs, maintenance engineers do not need to modify wiring terminals of the photovoltaic device when performing EL defect tests on the photovoltaic device. This helps reduce maintenance costs of the photovoltaic device.

Abstract: Systems and methods for imaging properties of subterranean formations (136) in a wellbore (106) include a formation sensor (120, 200) for collecting currents (304A, 304B) injected into the subterranean formations (139) and a formation imaging unit (118). The formation imaging unit (118) includes a current management unit for collecting data from the currents injected into the subterranean formations (136) and a formation data unit (116) for determining at least one formation parameter from the collected data. The formation imaging unit (118) also includes an inversion unit for determining at least one formation property by inverting the at least one formation parameter. The inversion unit is suitable for generating an inverted standoff image and an inverted permittivity image for comparison with a composite image of the formation imaging unit.