4166results about "Voltage-current phase angle" patented technology

A battery pack has a charge and discharge count measuring part (131) configured to measure the number of times of charges and discharges of a secondary battery based on the summed value of the charge current for the secondary battery, and a decay rate output part (132) configured to compute a decay rate that indicates a degree of decay of the secondary battery based on the number of times of charges and discharges measured by the charge and discharge count measuring part (131) and to output it to a device being a discharge load. For example, the charge and discharge count measuring part (131) repeatedly sums the detected values of the charge current to a predetermined threshold, and counts up the number of times of charges and discharges every time when the summed value reaches the threshold. Accordingly, even though charges and discharges are repeated at finer steps in a relatively narrow voltage range, the number of times of charges and discharges can be counted accurately, and the computing accuracy of the decay rate is improved. In the battery pack in which the secondary battery is accommodated, parameters for detecting the remaining amount of the battery are detected more accurately.

A system for determining service outages and restorations includes an outage management server (OMS) that generates reports of outages and restoration information for metering endpoints. The outages may be caused by faults at various locations in the distribution network. The metering endpoint may include a transmitter having a battery backup that transmits the outage information upon a failure to detect a voltage at the endpoint. The transmission of the information may be filtered based on configurable criteria. The metering endpoints may also inform the OMS when power is restored.

A monitoring device (1) for monitoring the electrical properties of a medium voltage overhead line (3) in a medium voltage network comprises three separate measurement sensors (2a, 2b, 2c), each being adapted for direct connection onto a medium voltage overhead line. Each of the measurement sensors has means to draw operating power from the medium voltage overhead line. The measurement sensors measured results may be combined for accurate measurement analysis.

The invention disclosed herein provides methods and materials for observing the state of a sensor, for example those used by diabetic patients to monitor blood glucose levels. Typically a voltage such as a voltage pulse is applied to the sensor in order to solicit a current response from which for example, factors such as impedance values can be derived. Such values can then be used as indicators of a sensor's state, for example the state of sensor hydration, sensor noise, sensor offset, sensor drift or the like.

The apparatus reduces the amount of correction for noise value error, so as to reduce work needed for correction to ensure error avoidance, and to improve the freedom of layout design, and to reduce load on DA. Based on a timing chart of signal transfer on each wire, the last edge appearance timing in the signal waveform of a victim whose noise value exceeds a limit value is compared with the last edge appearance timing in the signal waveform of an aggressor, to evaluate the noise value error in the victim. The apparatus is used in static noise checking of cell arrangement and inter-cell wiring after such cell arrangement and inter-cell wiring are performed at design of integrated circuits such as LSIs.

An event occurrence graph for display of events from a monitoring device or set of devices has a time-series of recorded events as a timeline, each event having a separate marker. Different event groups in the time-series occur at different levels, and the markers for the events in each event group may be distinctive from markers for the events in other event groups. Also lines may be drawn connecting start and stop events within an event group. The timeline may be zoomed, and the time scale adjusted automatically accordingly.

An electro-optical, automatic meter reader for enabling a consumer to view and manage power consumption through a browser. A sensor attached to a bracket is mounted to the outside cover of a utility meter without modification of the meter or removal of its housing. A data-collector stores data obtained from the sensor via a serial port which may also provide power for the sensor, thus avoiding use of a dedicated power supply. The data-collector connects to a computer which provides a centralized object through which to view and manage power consumption. The real-time and combined historic data can be used to forecast whether usage will fall above or below a predetermined usage level at the end of a given period of time. In response to a forecast exceeding the level, the computer displays the appropriate graph in a red colored bar within a quantity vs. time chart. The computer may control power consuming devices. A communication system may be established to the system for remote management by the consumer or by the utility company for its own billing and management purposes.

A method of displaying signals containing a spatial and a temporal aspect, where multiple signals are received by multiple sensors. The received signals are decomposed into separate signal components within one or more distinct frequency bands. Signal components are isolated within each frequency band based on differences between the signal components within the same frequency band, and the signal components are displayed. The signal components may be analyzed to determine a time course of activity and a location of the associated source. Representations of the source may also be generated and displayed to aid in monitoring the signals.

The invention provides a method of apparatus for testing circuit boards which does not require any inner wide power plane so as to detect an open circuit defect and / or a short circuit defect in a conductor path network formed in the circuit board quickly and accurately. An apparatus for testing a circuit board according to the present invention includes a transmission unit (2) for transmitting electromagnetic (radio) wave signal by way of an antenna (1) to a circuit board (3) to be tested, a detecting unit (3) for detecting signal received by a conductor path (4) of the circuit board (3) by using the conductor path (4) as a receiving antenna, and compare unit (8) for determining whether or not there is an open circuit defect or a short circuit defect in the conductor path (4) by comparing the detected signal with reference data of corresponding to a conductor path not including any defect.