Abstract: Provided herein is a power distribution system comprising a main power bus, sub-buses coupled to the main power bus, and a controller. The sub-buses provide power to electrical components of a vehicle. Each of the sub-buses includes an electrically programmable fuse in series with a relay. The controller is configured to detect a fault in a sub-bus of the sub-buses, determine a fault type associated with the fault, and in response to determining the fault type, generate a command to cause the relay to change a relay state.

Abstract: A virtual branch circuit system for an electric vehicle supply equipment (EVSE) can include a current sensor disposed in operative communication with circuit wires of a plurality of circuits of a virtual branch. The current sensor can be disposed between a plurality of circuit breakers and a plurality of respective loads. At least one of the plurality of loads is not an EVSE. The current sensor can be configured to sense a virtual branch total current comprising total current of all non-EVSE loads on the virtual branch. The system can include a control module operatively connected to the EVSE and configured to control a maximum EVSE current based on the virtual branch total current to maintain the virtual branch total current at or under a maximum branch current threshold.

Abstract: A feeding system that feeds power to a load includes only a single device configured to have neutral point high-resistance between a feeding line and the earth. The device functions as a ground fault overvoltage detection type of ground fault detector. The feeding system further comprises a control device. When the ground fault overvoltage detection type of ground fault detector detects a ground fault, the ground fault overvoltage detection type of ground fault detector transmits, to the control device via a signal line, a signal indicating that the ground fault has occurred. The control device instructs a breaker corresponding to the specific distributed unit in which it is determined that the ground fault has occurred to perform breaking.

Abstract: A three-output DC voltage supply for providing a positive, an intermediate, and a negative voltage supply is provided which includes a positive DC voltage bus and a negative DC voltage bus configured to be connected to a DC power source, a first voltage divider connected between the positive DC voltage bus and the negative DC voltage bus, wherein the first voltage divider includes a voltage-setting component and a resistive component, and a short-circuit protection component including first and second transistors of opposite types connected between the voltage-setting component and the resistive component, wherein a base of the first transistor is connected to a collector of the second transistor to define a first base/collector node, a base of the second transistor is connected to a collector of the first transistor to define a second base/collector node, and the intermediate voltage supply is provided by either the first or second gate/collector nodes.

Abstract: A photovoltaic power generation system includes an inverter, a controller, and at least two direct current branch circuits. The leakage current detection apparatus is configured to: detect a leakage current of the direct current branch circuit on which the leakage current detection apparatus is located and send the leakage current to the controller. The controller is further configured to: when the photovoltaic power generation system runs and a value of a leakage current of the direct current branch circuit exceeds a preset range, determine that an insulation fault occurs on the direct current branch circuit. The system can determine the direct current branch circuit on which the insulation fault occurs in the photovoltaic power generation system, so that measures are taken in time for the direct current branch circuit on which the insulation fault occurs, to eliminate a potential safety hazard.

Abstract: An electronic circuit breaker comprising: an input connected to an electric DC power supply; an output connected to a load; the input connected to the output via a switch, said switch is controlled via a switch control line between an “ON”-state and an “OFF”-state; a switch driver connected to the switch control line, said switch driver configured to control the switch; and a switch protection, a voltage detection branch configured to output a first electric potential indicative of the electrical potential difference between the input and the output; a comparator circuit configured to compare the first electrical potential with a first threshold voltage, said first threshold voltage is indicative of an over-current level flowing through the switch; and a gate controller connected to the switch disable line and configured to disable the switch by connecting the switch control line to a potential which causes the switch to enter the “OFF”-state.

Abstract: Embodiments of negative pressure wound therapy systems and methods are disclosed. In one embodiment, an apparatus includes a housing, negative pressure source, circuit board, and one or more controllers. The circuit board can be supported by the housing and include a conductive pathway extending around at least part of a perimeter of a first side of the circuit board. The conductive pathway can be electrically coupled to an electrical ground for the circuit board. The one or more controllers can be mounted on the circuit board and activate and deactivate the negative pressure source.

Abstract: An electronic ignition circuit may include a logic circuit and an ignition circuit electrically coupled to the logic circuit. The logic circuit may include a microcontroller and a switching circuit configured to switch from a first detonator or igniter to a second detonator or igniter in response to a signal from the microcontroller. The ignition circuit may include a capacitor discharging circuit configured to discharge a firing capacitor through a fuse head. The capacitor discharging circuit may include an ignition switch configured to remain actively closed after the firing capacitor is discharged through the fuse head.

Abstract: The present disclosure pertains to detection of abnormal, risky, or aberrant conditions in a power distribution network and to corresponding trip signals being used to trip open devices such as reclosers upstream of where the abnormal condition is detected. Detection of a missing broadband over power-line signal or of an open circuit between phases of a power distribution circuit may prevent severed conductors from causing a ground fault, therefore avoiding the possibility of fire and dangerous conditions.

Abstract: A liquid immersion cooler includes a metal case, a soldering layer, a heat conduction layer, and a porous structure. The metal case has a heated surface and a cooling surface disposed on back of the heated surface. The soldering layer is laid on the cooling surface. The heat conduction layer is laid on the soldering layer. The porous structure is laid on the heat conduction layer. Therefore, the waste heat from an electronic heat source may be rapidly dissipated.

Abstract: A GaN semiconductor power switching device (Qmain) comprising an integrated ESD 1protection circuit is disclosed, which is compatible with driving Qmain with a positive gate-to-source voltage Vgs for turn-on and a negative Vgs for turn-off, during normal operation. The ESD protection circuit is connected between a gate input of Qmain and a source of Qmain, and comprises a clamp transistor Q1, a positive trigger circuit and a negative trigger circuit, for turning on the gate of the clamp transistor Q1 responsive to an ESD event at the gate input of Qmain. The positive and negative trigger circuits each comprise a plurality of diode elements in series, having threshold voltages which are configured so that each of the positive trigger voltage and the negative trigger voltage can be adjusted. The ESD circuit topology requires smaller integrated resistors and can be implemented with reduced layout area compared to conventional integrated ESD circuits.

Abstract: A method, apparatus, and system for disconnecting loads from the electrical grid based on a power line frequency are disclosed. An electricity meter may monitor a power line frequency of a source power line connected to the electricity meter, and in response to determining that the power line frequency is lower than a disconnect threshold frequency, may open an internal switch and disconnect a load side output of the electricity meter from the source power line.

Abstract: Disclosed herein are systems and methods for optimizing transformer exciting current and loss test results by dynamically managing core magnetic state. In an exemplary embodiment, a method includes injecting a direct current (DC) offset voltage; adjusting at least one of a polarity and a magnitude of the DC offset voltage while monitoring a test current for one or more criteria; and bypassing a source of the DC offset voltage when the test current has satisfied the one or more criteria, whereby residual magnetism, if any, of a core of the transformer is minimized.

Abstract: Methods for configuring operation of at least one circuit protection device of a power distribution panel comprise receiving configuration instructions having associated therewith configuration data for each circuit protection device; based on the receiving the configuration instructions, configuring one or more operational functions of each circuit protection device; receiving or detecting an indication of a user-verification of the configuration data for one or more of the at least one circuit protection device; and based on the receiving or detecting the indication, configuring the respective circuit protection devices based on the corresponding configuration data.

Abstract: An arc detection device includes: a current detector that includes a magnetic core penetrated by first and second paths each connecting a DC power source and a device, and detects a current flowing through each of the first and second paths in accordance with a magnetic field generated at the magnetic core; a low impedance circuit having a lower impedance than the DC power source and the device, the low impedance circuit being connected to the first path and the second path to cause a high frequency component to bypass one of the first path or the second path; and an arc determiner that determines an occurrence of an arc based on a current detected by the current detector. In the magnetic core, a direct current flows through the first path in a direction opposite to a direction in which a direct current flows through the second path.

Abstract: Some implementations described herein provide techniques and apparatuses for a semiconductor processing tool including an electrostatic chuck having a voltage-regulation system to regulate an electrical potential throughout regions of a semiconductor substrate positioned above the electrostatic chuck. The voltage-regulation system may determine that an electrical potential within a region of the semiconductor substrate does not satisfy a threshold. The voltage-regulation system may, based on determining that the electrical potential throughout the region does not satisfy the threshold, position one or more electrically-conductive pins within the region. While positioned within the region, the one or more electrically-conductive pins may change the electrical potential of the region.

Abstract: A control device controls vehicle functions and has a largely fixed moveable object that can be actively operated by a person for the purpose of control. The object floats over a controlled magnetic field. A sensor is detects a displacement of the object by a person from its neutral position.

Abstract: The present disclosure pertains to detection of abnormal, risky, or aberrant conditions in a power distribution network and to corresponding trip signals being used to trip open devices such as reclosers upstream of where the abnormal condition is detected. Detection of open phase on a distribution circuit prevents severed conductors from causing a ground fault, therefore avoiding the possibility of fire and dangerous conditions. The voltage unbalance may be measured using an end of line relay that includes an electrical sensor or relay, a tripping mechanism, and a signal transmitter.

Abstract: An apparatus comprising a signal transformer coupled to a power line and a signal transmission, reception, or detection circuit. A sensor is configured to be responsive to the power line current or magnetic flux generated in a ferrite core of the signal transformer. When the sensor indicates that the flux generated by the power line current mat cause an attenuation of the signal strength, a second circuit generates a current through a flux cancelling winding that cancels at least some of the flux generated by the power line current.

Abstract: A switching device 1 includes a SiC semiconductor chip 11 which has a gate pad 14, a source pad 13 and a drain pad 12 and in which on-off control is performed between the source and the drain by applying a drive voltage between the gate and the source in a state where a potential difference is applied between the source and the drain, a sense source terminal 4 electrically connected to the source pad 13 for applying the drive voltage, and an external resistance (source wire 16) that is interposed in a current path between the sense source terminal 4 and the source pad 13, is separated from sense source terminal 4, and has a predetermined size.