WO2022101022A2 - VORRICHTUNG ZUR BESTIMMUNG EINES DURCH EINEN STROMLEITER FLIEßENDEN STROMS SOWIE EIN ELEKTRISCHES SYSTEM MIT SOLCH EINER VORRICHTUNG - Google Patents
VORRICHTUNG ZUR BESTIMMUNG EINES DURCH EINEN STROMLEITER FLIEßENDEN STROMS SOWIE EIN ELEKTRISCHES SYSTEM MIT SOLCH EINER VORRICHTUNG Download PDFInfo
- Publication number
- WO2022101022A2 WO2022101022A2 PCT/EP2021/079939 EP2021079939W WO2022101022A2 WO 2022101022 A2 WO2022101022 A2 WO 2022101022A2 EP 2021079939 W EP2021079939 W EP 2021079939W WO 2022101022 A2 WO2022101022 A2 WO 2022101022A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor element
- conductor
- current conductor
- current
- magnetic field
- Prior art date
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 87
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000000691 measurement method Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- G01R15/207—Constructional details independent of the type of device used
Definitions
- the invention is based on a device for determining a current flowing through a current conductor, the device having a magnetic field sensor unit with at least a first sensor element and a second sensor element for detecting a magnetic field strength along a detection direction, and the device being set up to do so depending on to determine the current from the magnetic field strengths detected by means of the first sensor element and the second sensor element.
- the sensor elements are designed as vertical magnetic field sensors and are arranged on opposite sides of the current conductor in such a way that the magnetic field can be detected in the vertical direction to the main plane of extension.
- the magnetic field generated circularly around the current conductor due to the current flowing through the current conductor acts on the sensor elements in the opposite direction due to their corresponding arrangement, for example upwards on the first sensor element and downwards on the second sensor element.
- external interference fields typically act on both sensors in the same direction, since these interference fields have a certain degree of homogeneity. These stray fields can then be calculated out by means of a differential evaluation when actually determining the current. The difference quotient is understood as the gradient of the magnetic field. Disclosure of Invention
- the invention is based on a device for determining a current flowing through a current conductor, the device having a magnetic field sensor unit with at least a first sensor element and a second sensor element for detecting a magnetic field strength along a detection direction, and the device being set up to do so depending on to determine the current from the magnetic field strengths detected by means of the first sensor element and the second sensor element.
- the current conductor has a constriction transversely to the longitudinal direction of the current conductor, with the magnetic field sensor unit being arranged on the current conductor in such a way that the first sensor element is offset parallel to the main plane of extension of the current conductor and above a first region of the current conductor and that the second sensor element is offset parallel to the main extension plane of the current conductor and is arranged above a second area of the current conductor, the first area and the second area having a different width to one another transversely to the longitudinal direction due to the constriction, and the first sensor element and the second sensor element each having one use planar measurement methods and each have a detection direction parallel to the main extension plane of the conductor and to one another.
- the sensor elements can use a planar measuring method due to the appropriate arrangement of the sensor elements and configuration of the current conductor, in order to enable a differential evaluation of the magnetic field strengths for determining the current.
- the current conductor Due to its corresponding design, the current conductor has a higher current density in the area of the constriction than outside the constriction, whereby a corresponding magnetic field gradient is formed in the direction of the main extension plane of the current conductor, which is recorded using the planar measuring method of the sensor elements and used to determine the current can. In this way, external interference fields can be eliminated when determining the current.
- the planar measurement method also has the advantage of an improved signal-to-noise ratio, increased accuracy, higher sensitivity and a larger bandwidth.
- the conductor can be designed, for example, as an electrical cable or as a busbar. If the current conductor is designed to be round or square, the main extension plane can be defined as desired, taking into account the corresponding geometry. Arranged above an area of the current conductor means in this case that the sensor element is arranged at a distance perpendicular to the main plane of extension in the respective area.
- the current flowing through this current conductor generates a magnetic field, which forms essentially in a circle around the current conductor.
- Determination of the current is to be understood here as meaning that the electrical current strength is determined, which corresponds to the charge flowing through the current conductor.
- the longitudinal direction is typically to be understood as meaning the direction along which the current essentially flows.
- the sensor elements of the magnetic field sensor can be designed, for example, as a Hall sensor, as an AMR sensor, as a GMR sensor or as a TMR sensor. Depending on the detected magnetic field strengths, the current flowing through the current conductor can then be inferred, since this flowing current generates a corresponding magnetic field.
- a constriction is to be understood as meaning a recess in the current conductor transversely to the longitudinal direction of the current conductor, which reduces the cross-sectional area of the current conductor in the longitudinal direction. Such a reduction in the cross-sectional area in turn results in an increase in the current density in this region.
- the constriction is designed in a stepped manner in such a way that the current conductor additionally has at least one further area with a different width than the first area and second area transverse to the longitudinal direction.
- the advantage here is that the skin effect in the current conductor can be reduced. This in turn results in increased frequency stability when determining the current.
- the further area has a greater width than the first and second area on which the first sensor element and second sensor element are arranged.
- a further embodiment of the invention provides that the constriction is designed in such a way that a ratio between the maximum and minimum cross-sectional area of the current conductor in the longitudinal direction is less than two.
- the advantage here is that the heat loss generated due to the higher current density within the constriction is limited.
- the constriction is formed from both sides transversely to the longitudinal direction of the current conductor.
- the constriction is formed from only one side transverse to the longitudinal direction of the current conductor.
- the first sensor element and the second sensor element are aligned in such a way that the respective detection direction of the first sensor element and the second sensor element runs parallel to the longitudinal direction of the current conductor.
- the first sensor element and the second sensor element are aligned in such a way that the respective detection direction of the first sensor element and the second sensor element runs transversely to the longitudinal direction of the current conductor. It is advantageous here that the magnetic field also runs in this direction.
- the invention also relates to an electrical system with a device according to the invention.
- Such an electrical system can, for example, be an electrical machine, for example a synchronous machine, with an inverter.
- the current conductor can be designed, for example, as a phase of the inverter, as a result of which the corresponding phase current which flows through this phase can be measured.
- FIG. 1 shows a device for determining a current flowing through a current conductor according to the prior art in a perspective view.
- FIG. 2 shows a perspective view of a first exemplary embodiment of a device according to the invention for determining a current flowing through a current conductor.
- FIG 3 shows a perspective view of a second exemplary embodiment of a device according to the invention for determining a current flowing through a current conductor.
- FIG. 1 shows a device for determining a current flowing through a current conductor according to the prior art in a sectional view.
- a device is shown.
- the device has a magnetic field sensor unit 20 which is arranged on a conductor 100 .
- the magnetic field sensor unit 20 in turn has at least one first sensor element 21 and one second sensor element 22 for detecting a respective magnetic field strength along a detection direction 25 .
- the magnetic field sensor unit 20 is arranged on a conductor 100 in such a way that the first sensor element 21 and the second sensor element 22 are arranged laterally above the main plane of extension of the conductor 100 on opposite sides of the conductor 100 and each have a detection direction 25 vertical to the plane of the main extension.
- the first sensor element 21 and the second sensor element 22 correspondingly use a vertical measuring method.
- the device is set up to detect a magnetic field strength using the first sensor element 21 and the second sensor element 22 and to determine the current flowing through the current conductor 100 as a function of the magnetic field strengths detected using the first sensor element 21 and the second sensor element 22.
- FIG. 2 shows a perspective view of a first exemplary embodiment of a device according to the invention for determining a current flowing through a current conductor.
- a device 10 for determining a current flowing through a current conductor 100 is shown, which differs from the device according to FIG.
- the constriction 110 is here formed from both sides transversely to the longitudinal direction 102 of the current conductor 100 .
- the magnetic field sensor unit 20 is arranged on the current conductor 100 in such a way that the first sensor element 21 is parallel to the main extension plane of the Current conductor 100 is offset and above a first area 121 of the current conductor 100 and that the second sensor element 22 is offset parallel to the main extension plane of the current conductor and is arranged above a second area 122 of the current conductor 100, with the first area 121 and the second area 122 due to the Constriction 110 have a different width 130 transverse to the longitudinal direction 102 to each other.
- first sensor element 21 and the second sensor element 22 each use a planar measuring method and each have a detection direction 25 parallel to the main extension plane of the current conductor 100 and to one another.
- first sensor element 21 and the second sensor element 22 are aligned in such a way that the respective detection direction 25 of the first sensor element 21 and the second sensor element 22 runs transversely to the longitudinal direction 102 of the current conductor 100, with the magnetic field also running in this direction, which runs through a current flowing in the longitudinal direction 102 is formed and which has a corresponding gradient through the constriction 100 with the thereby changed current density within the current conductor 100 .
- the constriction 110 is configured in a stepped manner such that the current conductor 100 additionally has at least one further region 123 with a different width 130 than the first region 121 and second region 122 transversely to the longitudinal direction 102 .
- constriction 110 is designed such that a ratio between the maximum and minimum cross-sectional area of the current conductor 100 in the longitudinal direction 102 is less than two, i.e. the cross-sectional area of the current conductor 100 is halved at most due to the constriction 110 .
- FIG 3 shows a perspective view of a second exemplary embodiment of a device according to the invention for determining a current flowing through a current conductor.
- a device 11 for determining a current flowing through a current conductor 100 is shown, the device 11 differing from the device 10 according to FIG is also designed only in one stage, so that only a first area 121 and a second area 122 with mutually different widths 130 are formed, on which the first sensor element 21 and the second sensor element 22 are arranged.
- device 11 Another difference from device 10 is that in device 11 the first sensor element 21 and the second sensor element 22 are aligned in such a way that the respective detection direction 25 of the first sensor element 21 and the second sensor element 22 runs parallel to the longitudinal direction 102 of the current conductor 100, in which due to the constriction and the corresponding current flow, a gradient field can also be detected.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/252,265 US20240012034A1 (en) | 2020-11-10 | 2021-10-28 | Device for Determining a Current Flowing Through a Current Conductor, and an Electrical System having such a Device |
EP21802262.2A EP4244636A2 (de) | 2020-11-10 | 2021-10-28 | VORRICHTUNG ZUR BESTIMMUNG EINES DURCH EINEN STROMLEITER FLIEßENDEN STROMS SOWIE EIN ELEKTRISCHES SYSTEM MIT SOLCH EINER VORRICHTUNG |
CN202180075708.1A CN116569048A (zh) | 2020-11-10 | 2021-10-28 | 用于确定流动通过导电体的电流的装置以及具有这样的装置的电系统 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020214072.3A DE102020214072A1 (de) | 2020-11-10 | 2020-11-10 | Vorrichtung zur Bestimmung eines durch einen Stromleiter fließenden Stroms sowie ein elektrisches System mit solch einer Vorrichtung |
DE102020214072.3 | 2020-11-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2022101022A2 true WO2022101022A2 (de) | 2022-05-19 |
WO2022101022A3 WO2022101022A3 (de) | 2022-07-07 |
Family
ID=78516800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/079939 WO2022101022A2 (de) | 2020-11-10 | 2021-10-28 | VORRICHTUNG ZUR BESTIMMUNG EINES DURCH EINEN STROMLEITER FLIEßENDEN STROMS SOWIE EIN ELEKTRISCHES SYSTEM MIT SOLCH EINER VORRICHTUNG |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240012034A1 (de) |
EP (1) | EP4244636A2 (de) |
CN (1) | CN116569048A (de) |
DE (1) | DE102020214072A1 (de) |
WO (1) | WO2022101022A2 (de) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5041780A (en) * | 1988-09-13 | 1991-08-20 | California Institute Of Technology | Integrable current sensors |
IT201600131871A1 (it) * | 2016-12-28 | 2018-06-28 | St Microelectronics Srl | Dispositivo sensore di corrente integrato e relativo dispositivo elettronico |
-
2020
- 2020-11-10 DE DE102020214072.3A patent/DE102020214072A1/de active Pending
-
2021
- 2021-10-28 WO PCT/EP2021/079939 patent/WO2022101022A2/de active Application Filing
- 2021-10-28 US US18/252,265 patent/US20240012034A1/en active Pending
- 2021-10-28 CN CN202180075708.1A patent/CN116569048A/zh active Pending
- 2021-10-28 EP EP21802262.2A patent/EP4244636A2/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN116569048A (zh) | 2023-08-08 |
WO2022101022A3 (de) | 2022-07-07 |
EP4244636A2 (de) | 2023-09-20 |
US20240012034A1 (en) | 2024-01-11 |
DE102020214072A1 (de) | 2022-05-12 |
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