摘要:
Device and method for measuring electrical current, for measuring current will drastically reduce labor costs that occur during physical installation of current transformer and software configuration of current transformer type and transformation rate (on measuring device side). Protection/auto detection/communication circuit in connection with RJ12 port on both current transformer and measuring device side will zero out any potential damage to current transformer or injury to user, due to wiring error. Auto detection/communication circuit will be implemented into each current transformer. Auto detection/communication circuit will be directly connected to RJ12 port which will assure plug and play compatibility with available measuring devices. Combination of auto detection/communication circuit, RJ12 port and compatible measuring device will drastically reduce labor costs. Current transformer needs only to be connected to measuring device, using single cable with RJ12 connector, everything else is done by auto detection/communication circuit, which will provide measuring device with current transformer transformation ratio and transformer type. No other configuration is needed on measuring device side when connecting current transformer. Auto detection/communication circuit also enables factory calibration of current transformers. Factory calibration on both current transformer and measuring device drastically improves system accuracy (accuracy of both current transformer and measuring device).
摘要:
A measurement circuit is arranged to make several measurements, either at different times or in respect of different frequency components of currents measured by current sensors in respective phases of a multiphase supply system. The measurments are then used to correct for discrepencies in the transfer function of the sensors.
摘要:
Die vorliegende Erfindung betrifft das Gebiet von Vorrichtungen und Verfahren zur Strombestimmung oder -messung. Um eine Lösung vorzustellen, die hinsichtlich der eigentlichen Stromleitung, die den zu messenden bzw. zu bestimmenden Strom führt, einen geringeren apparativen Aufwand und eine verbesserte Stabilität gegen Ausfall ermöglicht, wird eine Vorrichtung zum Bestimmen eines zu bestimmenden Stromes vorgeschlagen, mit einer Stromquelle (3) für einen Messstrom, einem Widerstand (1a, 1b) und wenigstens einer Spannungsmesseinheit (5, 7), wobei der Widerstand (1a, 1b) zwei Elemente (1a, 1b) einer Steckverbindung umfasst und dazu ausgelegt ist, dass der zu bestimmenden Strom und der Messstrom durch den Widerstand (1a, 1b) fließen, wobei der Messstrom eine Charakteristik aufweist, die ihn von dem zu bestimmenden Strom unterscheidet, wobei die Vorrichtung dazu ausgestaltet ist, anhand eines den Wider- standswert des Widerstands angebenden Wertes, der von der Spannungsmesseinheit (5, 7) unter Nutzung der Charakteristik des Messstroms erhalten wird, und eines von der Spannungsmesseinheit (5, 7) erhaltenen Wertes, der einen dem zu bestimmenden Strom zugehörigen Spannungsabfall angibt, den zu bestimmenden Strom zu bestimmen.
摘要:
A holder for a current sensor having separable portions with inner surfaces forming an opening and opposing outer surfaces having a groove to accommodate a current sensing coil. The holder includes flexible members on the portions and extending toward the opening such that the flexible members can hold a power cable substantially centered within the opening and concentric with the current sensing coil. The portions are joined together with a hinge pivotally mounted between them at one end and a releasable clasp joining them together at another end, providing for ease of installation around the power cable by hand and without requiring tools or additional fasteners.
摘要:
A fuel cell power controller tracks load current and fuel cell output voltage, and alerts on excessive fuel cell ramp rate, so another power source can supplement the fuel cell and/or the load can be reduced. A power engineering process makes efficient use of available fuel cell power by ramping up power flow rapidly when power is available, while respecting the ramp rate and other power limitations of the fuel cell and safety limitations of the load. Power flow decreases after an alert indicating an electrical output limitation of the fuel cell. Permitted power flow increases in response to a power demand increase (actual or requested) from the load in the absence of the alert. Power flow may increase or decrease in a fixed amount, a proportional amount, or per a sequence. A power controller relay may trip open on a low fuel cell output voltage or high load current.
摘要:
A replica circuit (115) for a buck converter senses a replica of the current through the low-side switch transistor MLS without using a sense resistor. The replica circuit includes a replica transistor (MREP1, MREP2) and a current sense amplifier CSA, which drives the replica transistor with a first replica current, which is a scaled version of the current through the low-side switch transistor MLS, and generates a second replica current. A resistor (305) converts the second replica current into an output voltage (CSAOUT). A sample switch error amplifier integrator circuit (351) including a sample switch (S1) and an error amplifier (EA) samples the second replica current during a sampling window to generate an error signal (VERR). A controller controls the high-side and low-side switch transistors (MLS, MHS) responsive to the error signal.
摘要:
An interconnect device includes a body portion (32) with conductors (14) passing through the body portion. An energy harvesting device (12), a power controller device(24) and a rechargeable DC power source (26) are configured such that the power controller device includes instructions programmed thereon for controlling the flow of power between the energy harvesting device, the DC power source, and a microcontroller (22). Sensor devices (16,18,20) are in electrical communication with the microcontroller. The sensors are arranged to detect parameters associated with the interconnect device and communicate the parameters to the microcontroller. An output device (28) communicates data from the microcontroller associated with the at least one sensor.
摘要:
Embodiments include apparatuses, systems, and methods including a switching converter having an output stage including a power switch or first switching device to convert an input switching signal to an output switching signal and a sensor stage including a second switching device and a third switching device. In embodiments, the sensor stage may be coupled to receive the output switching signal from the first switching device and to substantially replicate a condition of the first switching device to generate a continuous signal rather than a switched signal. In embodiments, the continuous signal may allow detection of a current level. In some embodiments, the current level may indicate an overcurrent event. A digital post-processing circuit may be coupled to the switching device to count a number of overcurrent events according to various embodiments. Other embodiments may also be described and claimed.
摘要:
The invention relates to a device for measuring an electrical current flow comprising a printed circuit board (5), a sensor component (6) for detecting magnetic fields, said sensor component (6) being arranged on a surface of the printed circuit board (5), and a conducting element (1 ) for conducting the current that is to be measured, wherein at least a first portion (1 a) of the conducting element (1 ) between a first end (3) of the conducting element (1) and a second end (4) of the conducting element (1) is arranged such that the sensor component (6) is situated between the surface of the printed circuit board (5) and the first portion (1a) of the conducting element (1), such that the sensor component (6) monitors a magnetic field generated by the current flowing through the conducting element (1).