current loop


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current loop

[′kər·ənt ‚lüp]
(electricity)

Current loop

In electrical wiring, a situation in which separation of hot and neutral leads results in higher than normal electromagnetic fields.

current loop

A serial transmission method that uses a closed loop. It originated with teletype machines that transmitted 20 mA (milliamperes) of current for a 1 bit and the absence of current for a 0 bit. A 60 mA loop is also used for digital signals. A common analog current loop is 4-20 mA (4 to 20 mA), which is widely used for process automation. Current loops provide a better signal-to-noise ratio (SNR) than voltage-based systems. Contrast with RS-232. See 4-20 mA.
References in periodicals archive ?
1 and with the conditions that the current loop is properly closed and its bandwidth is considerably higher than the voltage loop bandwidth, perfect current tracking may be presumed
In general, the d-q vector control has four PI controllers, two at inner current loop and the remaining at outer voltage loop.
Generally, the reference [i.sub.d.sup.*] in the d current loop is set to be zero to maintain a constant flux operating condition, and the reference current [i.sub.q.sup.*] is determined by the subsystem [S.sub.1].
When L is constant, the bigger [K.sub.p0] is, the bigger bandwidth [omega] is, which represents that the response speed of current loop is faster; when [K.sub.p0] is constant, the bigger L is, the bigger bandwidth [omega] is, which represents that the response speed of current loop is slower.
The proposed controller uses a cascaded loop: an outer voltage loop and an inner current loop. The former compares the sensing DC bus voltage in the link capacitor with the given reference, whereas the latter uses sliding-mode controller to regulate the grid current allowing the synchronization of the currents [i.sub.g] with utility grid voltages [v.sub.g].
For two specific field configurations, the large current loop and the dipole, the system is simplified, obtaining a leading order model.
The company says based on the trusted measurement capabilities of the Fluke 87 DMM, the 787B adds the ability to measure, source and simulate mA with the accuracy and resolution you would expect from a Fluke mA loop calibrator, giving the ideal tool for troubleshooting and calibrating current loop applications.
In this paper, a novel IARC controller in current loop for minimizing torque ripples in PMSM systems is proposed.
The inner current loop controllers are designed to achieve 300Hz bandwidth while the outer loop controller gains are selected based on the worst case operating point (4krpm with 5A DC load).
The RD2X4 quad remote display has the capability to interface to RS-232 or 20mA current loop. The display's Auto Learn mode adapts to the data output for your indicator and is compatible with Cardinal Scale's U.S.-made 225 Navigator or 825 Spectrum weight indicators with multi-scale option cards.
The AKD platform is one of the highest performing on the market, with a 0.67 ps current loop: Approximately 100x the industry-standard speeds of 62.5 ps.
This strategy led to the development of the reverse geometry low-inductance chip capacitor (LICC), which, when compared to an equal case size MLCC, has an effective current loop with a smaller area and greater span that reduces inductance by approximately 3 to 4 times.