A power management system is provided to manage internal and external power sources for an embedded electronic device. The power management system includes an internal power source and an external power source. The power management system determines when to power the internal embedded electronic device or devices from either the internal or external power source, when to recharge the internal power source, when to shut down the internal embedded electronic device so as not to over discharge and damage the internal power source when external power is not available.

Some aspects of this disclosure are directed to an automated method to check electrostatic discharge (ESD) effect on a victim device. For example, some aspects of this disclosure relate to a method, including determining a probe point, in a circuit design, for determining effective resistance between the probe point and ground, where the probe point is on an ESD path of in the circuit design. The method includes determining voltage between the probe point and the ground. The method further includes comparing, by a processing device, a resistance value of the ESD path determined based a predefined electric current value at a source point and the measured voltage with a target resistance value range. The method further includes reporting a violation upon determining that the determined resistance value of the ESD path is outside the target resistance value range.

An instrument interface method and device. Two capacitors, one capacitor has one end as input of the device, connected to live line of power output of a LISN, and has other end as output of the device, connected to one test port of an oscilloscope; the other capacitor has one end as input of the device, connected to neutral line of the power output of the LISN, and has other end as output of the device, connected to another test port of the oscilloscope; without changing the LISN design, existing LISN products can be used for conducted emission test with oscilloscope-based time-domain EMI measurement instruments by means of the method and device. Said two capacitors have a capacity of <0.09 μF, which reduced the requirements of oscilloscope's A/D conversion, making low-cost oscilloscope can also be used for EMI testing.

A ground fault detection device includes: a detection capacitor; a switch group for switching between a first charging path connecting the battery and the detection capacitor, a second charging path connecting the battery, a negative side insulation resistance and the detection capacitor, a third charging path connecting the battery, a positive side insulation resistance and the detection capacitor, and a measurement path for measuring a charging voltage of the detection capacitor; and a controller configured to calculate the insulation resistance based on a charging voltage measured value of the detection capacitor which exists after charging each of the charging paths, wherein after measurement of the charging voltage of the second charging path, the controller is configured to cause the switch group to switch to the third charging path before switching to the first charging path.

A detection and measurement unit for detecting electromagnetic interference, the detection and measurement unit being configured to receive a representative digital signal. The detection and measurement unit includes a detection subunit configured to compare the amplitude of the representative digital signal with a first triggering threshold and a second stopping threshold. The second stopping threshold corresponds to an amplitude less than that of the first triggering threshold. The detection subunit is configured to detect an electromagnetic pulse on each detection of the passage of the amplitude of the representative digital signal through the second stopping threshold in a falling edge after the amplitude of the representative digital signal.

The present invention relates to a measuring apparatus, comprising: an arbitrary waveform generator to generate, and inject to a coupling network, a combination of N test signals; the coupling network to couple the N test signals to an EUT, and the responses thereof and those signals generated by the EUT itself, to a measuring unit; the measuring unit to measure the electrical rn signals provided by the coupling network; and—a processing unit to process the N test signals and the measured electrical signals, to obtain: the electromagnetic signals, noise or EMI generated by the EUT; and—the Z, Y or S parameters of the EUT or any other meaningful set of parameters that can be computed from the aforementioned ones or from voltages and currents. The invention also relates to a measuring method adapted to perform method steps with the apparatus of the invention.

A method for measuring the hardware and operational state of a dual-circuit solenoid valve including first and second coaxial coils each associated with a circuit is disclosed. The method includes the steps of injecting a sinusoidal current into the first coil; measuring the voltage induced across the terminals of the second coil; and plotting at least one curve of a first magnitude proportional to the measured induced voltage as a function of a second magnitude proportional to the injected sinusoidal current.

The present invention discloses an in-situ monitoring method and apparatus for a power electronic device explosion. A power electronic device is excited to produce an explosion failure by using a fault excitation module. An electrical signal of the power electronic device is monitored in real time by using an electrical signal monitoring module. Gas information of a test cavity is monitored in real time by using a gas monitoring module. External pictures of the power electronic device are captured by using a high-speed image capturing module. Internal pictures of the power electronic device are captured by using a high-speed X-ray imaging module. Each module in the apparatus is triggered to work according to a predetermined time sequence and time interval by using a time sequence control module. The entire apparatus is controlled and data is acquired, stored, and displayed by using a main control module.

A method detects an electrical insulation fault between an electric power source and an electrical ground, via a circuit that includes a controllable voltage generator and an electrical measuring resistor connected in series between a terminal of the electric power source and the electrical ground. The method includes controlling the voltage generator to establish, between its terminals, a non-zero voltage value, and measuring the voltage at the terminals of the electrical measuring resistor to detect an electrical insulation fault between the electric power source and the electrical ground. The method further includes a computer determining, depending at least on the voltage measured at the terminals of the electrical measuring resistor, at least two parameters characteristic of a disturbance affecting the detection of the electrical insulation fault, and calculating a reliability level of the detection of the electrical insulation fault depending on at least one of the two parameters.

A method for discharging a vehicle high-voltage electrical system, which is galvanically isolated from a ground potential, in the presence of a residual current makes provision for the following step: determining whether a residual current flows between a first HV potential of the vehicle high-voltage electrical system and the ground potential or a residual current flows between a second HV potential of the vehicle high-voltage electrical system and the ground potential. The method furthermore makes provision to discharge only that Cy capacitance which exists between the ground potential and that HV potential from which or to which the residual current flows. The discharging is triggered by determining the existence of a residual current. Furthermore, an on-board vehicle electrical system and an insulation monitoring device which are designed for performing the method are described. In addition, a corresponding charging-station high-voltage electrical system is described.