An electrical measurement device for monitoring the current and power taken by a plurality of electrical loads that may be powered by a selected one of multiple AC power sources comprises sampling the voltage of said sources and the current taken by said loads at a integral number of samples per cycle at sample times determined by an independent processor clock. The integral number of samples of each measured parameter for each cycle are processed to determine a complex number for each parameter representative of the amplitude and the phase relative to the independent processor clock. The phase drift of the substantially constant source voltages may be determined as a measure of frequency of the sources, and may be used to cancel drift of the current measurement to enable averaging. When the source feeding a load is changed, the phase drift is removed from its current measurement by selecting the voltage samples of the source now feeding it to use for drift cancellation or for average power computation and cumulative energy computation.

A current measurement circuit is disclosed. The current measurement circuit includes first and second circuit branches coupled to a circuit node through which current is to be measured. During a first period, the first circuit branch converts the current into a first voltage. During a second period, the second circuit branch converter the current into a second voltage. An analog-to-digital converter is configured to convert the first and second voltages into digital values indicative of the measured current. A control circuit is configured to alternately select one of the first and second branches during the generation of the digital values.

An electrical current measurement circuit is provided. The electrical current measurement circuit is configured to receive a sense current proportionally related to an electrical current of interest to continuously charge a capacitor to a sense voltage. The electrical current measurement circuit is configured to determine whether the sense voltage reaches a predefined voltage threshold and reduce the sense voltage to below the predefined voltage threshold in response to the sense voltage reaching the predefined voltage threshold. The electrical current measurement circuit counts each occurrence of the sense voltage reaching the predefined voltage threshold and quantifies the electrical current based on a total count of the sense voltage reaching the predefined voltage threshold during the predefined measurement period. By incorporating the electrical current measurement circuit in an electronic device, it may be possible to accurately monitor and thus help to optimize power consumption and battery life of the electronic device.

A protection circuit for an automotive wiring harness includes an input node receiving a sensing signal indicating intensity of current in a conductor, an output node emitting a current control output signal to reduce the current and/or emitting a warning signal indicating the current intensity having reached a limit value. Signal processing circuitry coupled to the input node compares the current intensity with a reference value, and produces a comparison signal indicating whether the current intensity exceeds the reference value. A counting circuitry driven by the comparison signal counts in a first count direction as a result of the comparison signal indicating that the current intensity exceeds the reference value. Latching circuitry coupled to the counter circuitry generates the output signal at the output node as a result of the count value of the counter circuitry reaching a limit value.

A method for analyzing effects of electrical perturbations on equipment in an electrical system includes processing energy-related signals from at least one intelligent electronic device in the electrical system to identify an electrical perturbation in the electrical system. An end time of the electrical perturbation may be determined, and electrical measurement data from prior to, during and/or after the end time of the electrical perturbation may be analyzed to identify and quantify the effects of the electrical perturbation on equipment in the electrical system. The effects may include, for example, equipment restarts/re-energizations due to the electrical perturbation. One or more actions may be taken or performed to reduce the effects of the electrical perturbation and extend the life of the equipment. The actions may include, for example, at least one of communicating the equipment restarts/re-energizations and controlling at least one component in the electrical system.

A stand-alone remote sensor arrangement (2) for monitoring parameter activity in a cable (4), the arrangement comprises a sensor unit (6) and a power source unit (8) connected to each other by a connecting cable (10), and a control unit (12), the power source unit (8) is configured to supply energy to said sensor unit (6), the sensor unit (6) comprises a shielded housing (14) enclosing a toroid-shaped core (16) configured to be fixed around the cable (4) to be monitored, and the toroid-shaped core (16) is provided with at least one gap where a Hall sensor element (18) is arranged. The remote sensor arrangement (2) is configured to be operated in a low current consumption mode and in a measurement mode, in which measurement mode said Hall sensor element (18) is configured to sense a predetermined parameter activity, e.g. flowing current, of said cable (4), and that said control unit (12) is configured to change the mode of operation of said sensor arrangement (2). The sensor unit (6) further comprises a sensor activation unit (20) arranged and structured to sense parameters related to magnetic field variations in said core (16) caused by said parameter activity of said cable (2), and to generate a sensor activation signal (22) including parameter values dependent on said sensed parameters, wherein the control unit (12) is configured to receive said sensor activation signal (22) and to evaluate said parameter values in relation to predetermined mode changing criteria, and to change mode of operation of said sensor arrangement (2) dependent on the result of said evaluation.

An electronic power connector including a contact configured to electrically connect a power supply to a load. The electronic power connector further including a contact core configured to receive the contact, the contact core including a transformer winding wrapped around the contact core, the transformer winding configured to sense a current

Described herein is a method including measuring a current in a wire, normalizing the measured current, and comparing the normalized measured current to a control curve. The control curve is a function of a series of normalized current magnitudes and reaction times for corresponding ones of that series of normalized current magnitudes. The method further includes limiting the current in the wire based upon the comparison. The reaction times for ones of the series of normalized current magnitudes are times at which current limitation would occur if the normalized current remained at an associated normalized current magnitude.

A system includes a two-conductor loop in which the loop current or current signal is controlled by a loop current controller to be proportional to a signal output from a sensor. The system further includes energy harvesting circuity in electrical connection with the two-conductor loop which includes a second current controller in parallel electrical connection with the loop current controller and a power converter in electrical connection with the second current controller. The second current controls a portion of current drawn from the two-conductor loop and delivered to the power converter from an output port thereof. The portion of the current drawn from the two-conductor loop is returned to the loop current controller from the energy harvesting circuit. Noise in the portion of the current drawn from the two-conductor loop by the second current controller is controlled by the second current controller to be below a predetermined threshold.

A circuitry is configured to calculate a measured average value based on measured current values obtained in a target period for determination, and determine whether a memory device is an authorized or an unauthorized product, based on a comparison result between a measured average value and a reference average value.