WO2008011842A1 - Current detection device - Google Patents
Current detection device Download PDFInfo
- Publication number
- WO2008011842A1 WO2008011842A1 PCT/DE2006/001290 DE2006001290W WO2008011842A1 WO 2008011842 A1 WO2008011842 A1 WO 2008011842A1 DE 2006001290 W DE2006001290 W DE 2006001290W WO 2008011842 A1 WO2008011842 A1 WO 2008011842A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- conductor
- field sensors
- detection device
- current detection
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
Definitions
- the invention relates to a current detection device with at least one, at least one electrical conductor associated sensor, in particular a magnetic field sensor.
- the invention generally relates to the field of potential-free detection of electrical currents on the one hand from the milliampere to the kilo-ampere range and on the other hand, from the DC case to high-frequency electrical currents.
- the sensor in a current detection device having at least one sensor assigned to at least one electrical conductor, has at least two magnetic field sensors assigned to the or each conductor, in particular in an embodiment as MR sensor, preferably as AMR, GMR or TMR sensor.
- TMR Tunnel Magnetoresistive effect
- At least two Magnetic field sensors are provided in order to eliminate or at least reduce a possible external field influence.
- Against this background is measured with two sensors at two points of the conductor, preferably "left and right" of the conductor, eg in a constellation in which the at least two magnetic field sensors on a circumferential surface of the conductor or, in the case of multiple conductors, the conductor evenly distributed are arranged.
- the or each magnetic field sensor is mounted on a magnetostriction-free layer.
- a magnetostrictive effect an interaction of magnetic and mechanical parameters of ferromagnetic materials is known, which leads to a mechanical change in length in the ferromagnetic element by aligning the so-called white areas under the influence of an external magnetic field.
- the magnetic field sensor is applied to a magnetostriction-free layer.
- a thin plastic layer is separated.
- the magnetic field sensor in particular in its embodiment as MR, GMR, AMR, or TMR sensor (hereinafter referred to as MR sensor), measures the magnetic field strength of the or each current-carrying conductor, which in turn is proportional to the current to be detected.
- the at least two magnetic field sensors are arranged in a recess formed in the electrical conductor or intended for arrangement in such a recess.
- a recess in a conductor is e.g. in a slotted bus bar in which the magnetic field sensors are provided on opposite side surfaces of the recess, e.g. of the slot in the busbar, are arranged.
- the minimum at least two magnetic field sensors are arranged on a carrier surrounding the or each conductor and in particular in a manner in which the magnetic field sensors are distributed uniformly on a ümfangs simulation the support or in which, in the case of exactly two magnetic field sensors, the two magnetic field sensors arranged opposite each other are.
- An alternative arrangement of the magnetic field sensors with respect to the or each conductor is that at least two conductors, which together form a conductor arrangement, at least two magnetic field sensors are provided, which are arranged around a center of the conductor arrangement.
- one magnetic field sensor is assigned to one of the conductors and the magnetic field sensors are arranged at a spacing from each other, just like the conductors.
- An example of such an arrangement is an arrangement in which the conductors form the vertices of an equilateral triangle and the magnetic field sensors are arranged at the center of such a conductor arrangement such that each magnetic field sensor is assigned to exactly one of the conductors, so that the magnetic field sensors also at least essentially one another to reproduce the shape of an equilateral triangle.
- the advantage of the invention and its embodiments is therefore in particular that an easily manageable current detection device is specified, which can be used even with already in operation ladders and on the one hand with respect to the circuit under test operates without feedback and on the other hand by a small design and comparatively low production costs.
- FIG. 1 shows a schematically simplified representation of a current detection device according to the invention
- FIG. 2 magnetic field sensors of such a current detection device on a round conductor
- FIG. 5 shows magnetic field sensors of such a current detection device on a carrier surrounding a conductor bundle
- FIG. 6 shows magnetic field sensors of such a current detection device on an outer conductor of a plurality of coaxial conductors
- Current detection device 10 which comprises a sensor 12, which in turn comprises at least two magnetic field sensors 14, 16 or is formed by these magnetic field sensors 14, 16.
- the sensor 12 may include an evaluation electronics 18 or it may be provided that, as shown, the sensor 12, the transmitter 18 is associated.
- the current detection device 10 is then generally a display and / or processing unit 20, by means of which either the recorded measured values are processed, displayed or converted. The latter is known in the art and will not be discussed further.
- FIG. 2 shows an embodiment in which the two magnetic field sensors 14, 16 of the sensor 12 (FIG. 1) of the current detection device 10 (FIG. 1) are assigned to an electrical conductor 22.
- the magnetic field sensors 14, 16 are designed as flat and in particular flexible current sensors, particularly preferably in one embodiment as an MR sensor, and applied directly on two opposite sides on the electrical conductor 22 designed as a round conductor.
- the opposite arrangement of the two magnetic field sensors 14, 16 is a special embodiment for exactly two magnetic field sensors 14, 16. Generally, it is provided according to the invention that in a plurality of magnetic field sensors these are arranged distributed uniformly on a peripheral surface of the conductor 22.
- FIG 3 shows a variant with an electrical conductor 22 in the form of a flat rail.
- the two magnetic field sensors 14, 16 are applied in the illustrated embodiment on the two long side surfaces of the conductor 22 and evenly distributed evenly on the circumferential surface of the conductor 22. An attachment to the short side surfaces is alternatively considered as well.
- FIG. 4 shows an embodiment in which the conductor 22 is designed in the form of a slotted rail and insofar has a recess 24.
- the recess 24 is thus the slot in the conductor 22 designed as a slotted rail.
- two magnetic field sensors 14, 16 are arranged in the recess 24 formed in the conductor 22 and on opposite side surfaces 26, 28 of the recess 24
- 5 shows an embodiment in which two magnetic field sensors 14, 16 are mounted on a carrier 30 surrounding a group of conductors 22. The attachment of the magnetic field sensors 14, 16 on such a carrier 30 takes place as the Anbringung directly on a conductor (see FIG 2), either opposite each other, namely "right and left" from the carrier 30, or uniformly on the peripheral surface of the carrier 30 distributed.
- FIG. 6 shows an embodiment with concentrically arranged conductors 22, wherein the illustrated two magnetic field sensors 14, 16 are mounted on two opposite sides of the outer conductor 22.
- FIG. 7 shows an embodiment in which the illustrated two magnetic field sensors 14, 16 surround a bundle of conductors in the same form as shown in FIG.
- 16, 16 ' are arranged around a center 32 of a conductor arrangement formed by the conductors 22.
- a magnetic field sensor 14, 16, 16 ' is assigned to one of the conductors 22 of the conductor arrangement.
- the magnetic field sensors with each other are arranged as well as the conductor 22 regularly spaced.
- the conductors 22 are arranged approximately in the region of the vertices of an imaginary equilateral triangle. Accordingly, the magnetic field sensors 14, 16, 16 'also form an equilateral triangle in their arrangement with each other, wherein in each case a magnetic field sensor 14, 16, 16' is assigned to exactly one of the conductors 22.
- Each magnetic field sensor is provided in all illustrated embodiments for measuring the magnetic field of the respective current-carrying conductor 22. Accordingly, no iron or the like, as in the in the state of Technology known solutions needed. Thus, even at high rated currents, the increase in the volume and the associated price of otherwise possible measuring devices is avoided.
- the current detection device can be easily and inexpensively mounted on the or each respective conductor 22! Due to its low weight, the current detection device is also resistant to vibration and shock.
- a differential field is detected by the group of magnetic field sensors 14, 16, 16 'used.
- the detection of the individual currents in the respective conductors 22 becomes possible. The goal is to reduce the total number of magnetic field sensors.
- a current detection device is provided with at least one sensor 12 assigned to at least one electrical conductor 22, in which the sensor 12 has at least two magnetic field sensors 14, 16, in particular assigned to the or each conductor 22 an embodiment as MR sensors includes. Since such MR sensors directly measure the magnetic field of the current-carrying conductor 22, one does not need an iron circle. Thus, even at a high rated current, there is no need for an iron circuit with the associated disadvantages in terms of a comparatively high volume and a comparatively high price.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001290 WO2008011842A1 (en) | 2006-07-26 | 2006-07-26 | Current detection device |
DE112006004039T DE112006004039A5 (en) | 2006-07-26 | 2006-07-26 | Current detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001290 WO2008011842A1 (en) | 2006-07-26 | 2006-07-26 | Current detection device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008011842A1 true WO2008011842A1 (en) | 2008-01-31 |
Family
ID=37831532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/001290 WO2008011842A1 (en) | 2006-07-26 | 2006-07-26 | Current detection device |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112006004039A5 (en) |
WO (1) | WO2008011842A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0597404A2 (en) * | 1992-11-13 | 1994-05-18 | ABBPATENT GmbH | Method and device for determining lead currents of a polyphase system |
DE19914772A1 (en) * | 1999-03-31 | 2000-10-12 | Aeg Niederspannungstech Gmbh | Current sensors |
DE10054016A1 (en) * | 2000-11-01 | 2002-05-08 | Bosch Gmbh Robert | Current amplitude measurement using magnetic field sensors inserted inside an electric cable or a comb-like conducting section placed in the cable with an adjacent magnetic sensor, with current deduced from the magnetic field |
DE10100597A1 (en) * | 2001-01-09 | 2002-07-18 | Bosch Gmbh Robert | Device, ammeter and motor vehicle |
DE10110254A1 (en) * | 2001-03-02 | 2002-09-05 | Sensitec Gmbh | Current transducer for high frequency measurement, comprises one or more current conductors, of which the resultant magnetic field due to a current flow is measured using magnetic field sensors |
DE10315532A1 (en) * | 2003-04-04 | 2004-11-11 | Infineon Technologies Ag | Current sensing integrated circuit has two magnetic field sensor chips arranged on opposing sides of framework and an evaluation unit all contained within sensor housing |
-
2006
- 2006-07-26 DE DE112006004039T patent/DE112006004039A5/en not_active Withdrawn
- 2006-07-26 WO PCT/DE2006/001290 patent/WO2008011842A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0597404A2 (en) * | 1992-11-13 | 1994-05-18 | ABBPATENT GmbH | Method and device for determining lead currents of a polyphase system |
DE19914772A1 (en) * | 1999-03-31 | 2000-10-12 | Aeg Niederspannungstech Gmbh | Current sensors |
DE10054016A1 (en) * | 2000-11-01 | 2002-05-08 | Bosch Gmbh Robert | Current amplitude measurement using magnetic field sensors inserted inside an electric cable or a comb-like conducting section placed in the cable with an adjacent magnetic sensor, with current deduced from the magnetic field |
DE10100597A1 (en) * | 2001-01-09 | 2002-07-18 | Bosch Gmbh Robert | Device, ammeter and motor vehicle |
DE10110254A1 (en) * | 2001-03-02 | 2002-09-05 | Sensitec Gmbh | Current transducer for high frequency measurement, comprises one or more current conductors, of which the resultant magnetic field due to a current flow is measured using magnetic field sensors |
DE10315532A1 (en) * | 2003-04-04 | 2004-11-11 | Infineon Technologies Ag | Current sensing integrated circuit has two magnetic field sensor chips arranged on opposing sides of framework and an evaluation unit all contained within sensor housing |
Also Published As
Publication number | Publication date |
---|---|
DE112006004039A5 (en) | 2009-07-02 |
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