Compensation current sensor arrangement
a current sensor and compensation technology, applied in the direction of voltage/current isolation, magnetic field magnitude/direction, measurement devices, etc., can solve the problem of brief peak currents and achieve the effect of reducing power loss
Inactive Publication Date: 2017-08-31
VACUUMSCHMELZE GMBH & CO KG
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Benefits of technology
The patent is about a current sensor that compensates for magnetic interference caused by the current being measured. The sensor has multiple secondary windings that generate magnetic fields when subjected to the current being measured. These fields are then combined to create a magnetic field that is measured by a magnetic field sensor. The sensor uses evaluation circuits to adjust the compensation currents to make the resulting magnetic field sensor measure zero. The technical effect of this design is that it reduces power loss and allows for a higher turn ratio, which is important for accurate current measurements.
Problems solved by technology
However, during the operation of such compensation current sensors, brief peak currents may occur that are significantly above the rated current (continuous current).
Method used
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[0019]FIG. 1 depicts in a schematic illustration an example of an improved compensation current sensor. The compensation current sensor has four windings 1, 2, 3, and 4, which are wound on an enclosed magnetic core 5 of soft magnetic material such as iron or an iron alloy. In the present case, magnetic core 5 has the shape of a ring core of a rectangular basic structure and a rectangular cross-section (not apparent from FIG. 1). Magnetic core 5 has due to its rectangular basic structure four arms of which two opposing arms are equipped with two of the windings 1, 2, 3, and 4. Accordingly, windings 1 and 2 are wound around one of these two arms, while windings 3 and 4 are wound around the other of these two arms. To this end, windings 1 or 3 are initially applied on the two arms in question, on which then windings 2 or 4 are wound on top of these. Windings 1 and 3 are electrically switched in series and together form a first secondary winding 21. Accordingly, windings 2 and 4 are ele...
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The current sensor arrangement according to the compensation principle has a primary conductor, designed to generate a primary magnetic field dependent on a current to be measured flowing through it, a first secondary winding, designed to generate a first secondary magnetic field dependent on a first compensation current flowing through said winding, a second secondary winding designed to generate a second secondary magnetic field dependent on a second compensation current flowing through said winding, a magnetic field sensor designed to generate a measurement signal that represents a magnetic field detected by it; a magnetic core of soft magnetic material designed and arranged to magnetically interconnect a primary conductor, a first seconding winding, a second secondary winding, and a magnetic field sensor; a first evaluation circuit; and a second evaluation circuit.
Description
[0001]This U.S. continuation application claims the benefit of U.S. application Ser. No. 14 / 258,217, filed Apr. 22, 2014, which claims benefit of the filing date of DE 10 2013 207 277.5, filed 22 Apr. 2013, the entire contents of which are incorporated herein by reference for all purpose.BACKGROUND[0002]1. Field[0003]Disclosed herein is a current sensor arrangement according to the compensation principle.[0004]2. Description of Related Art[0005]Current sensor arrangements serve to determine the electric current strength of a current to be measured and are special instrument transformers that are operated according to various principles. Current sensor arrangements operating according to the compensation principle, also known as compensation current sensor arrangements or compensation current sensors for short, generally have a magnet core of a soft magnetic material, which encloses a primary conductor carrying the current to be measured. The current to be measured flows through the ...
Claims
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IPC IPC(8): G01R19/00G01R33/02G01R15/18
CPCG01R19/0092G01R33/02G01R15/185
Inventor LENHARD, FRIEDRICH
Owner VACUUMSCHMELZE GMBH & CO KG