A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.

An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.

A digital power distribution system includes a source sensor configured to provide feedback that includes a signal indicative of voltage across the source terminals; a source controller configured to receive the feedback from the source sensor and to generate a control signal that substantially increases or decreases impedance between the power source and the source terminals; a non-linear load configured such that the electrical current it draws from the load terminals drops by at least an order of magnitude below a non-zero voltage threshold; reduced capacitance on the load side for storing charge and discharging that charge during the sample period, wherein the reduced capacitance is reduced to a level for providing the at-least-an-order-of-magnitude-lower electrical current drawn by the non-linear load below the voltage threshold; and a source disconnect device responsive to the control signal from the source controller.

Various embodiments of the present disclosure provide an electronic device of a metal member and a method therefor. The electronic device includes: a memory; an abnormality detection circuit; and a processor functionally connected with the memory or the abnormality detection circuit, wherein the processor is configured to detect whether there is an abnormality in an electric shock prevention circuit or whether a leakage path is formed from a ground of the electronic device to the metal member by using the abnormality detection circuit, and to control charging a battery of the electronic device according to whether there is the abnormality in the electric shock prevention circuit or whether the leakage path is formed. Other embodiments are possible.

Various embodiments of the present disclosure provide an electronic device of a metal member and a method therefor. The electronic device includes: a memory; an abnormality detection circuit; and a processor functionally connected with the memory or the abnormality detection circuit, wherein the processor is configured to detect whether there is an abnormality in an electric shock prevention circuit or whether a leakage path is formed from a ground of the electronic device to the metal member by using the abnormality detection circuit, and to control charging a battery of the electronic device according to whether there is the abnormality in the electric shock prevention circuit or whether the leakage path is formed. Other embodiments are possible.

A device for detecting stray electrical currents in fluid mediums comprises at least two probes for partially disposing in a fluid medium and a control unit. The control unit comprises at least one analog-to-digital signal converter in electrical communication with at least one of the probes, at least one audio-visual alarm, and a processor operably coupled to the at least one converter and to the at least one audio-visual alarm. The processor is operable to measure an electrical potential difference between the two probes, to analyze a plurality of the measurements to determine whether a predetermined frequency is present, and to transmit an alert signal to the audio-visual alarm if the predetermined frequency is present. Advantageously, by monitoring for the frequency, the device more consistently and more reliably detects the presence of stray alternating currents.

A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

A remote power unit for providing direct current power to a remote power receiver in a direct current power system is provided. A residual current protection circuit comprises a first switch, which opens a positive voltage rail, and a second switch, which open a negative voltage rail. A first current sensor measures a first residual current between the first switch and the remote power receiver, while the first switch is closed and the second switch is opened. A second current sensor measures a second residual current between the second switch and the remote power receiver, while the second switch is closed and the first switch is open. A controller detects a residual current event, if the first residual current and/or the second residual current are above a residual current threshold.

Systems and techniques are disclosed that monitor an area adjacent to power system components and detect objects that may pose a probable risk of causing a fault, for example, making contact with the power system component. Various embodiments initiate a preventative, a corrective, and/or a mitigative action in advance of the fault. Examples of possible actions include, but are not limited to, an audible alert, a visual alert, a tactile alert, a remote notification, a limiting of machinery motion, a stopping of machinery motion, a reversing of machinery motion, de-energization of the power system component, or combinations thereof.