WO2024175173A1 - Vorrichtung mit einem magnetfeldgenerator und verfahren zur bereitstellung einer spulenanordnung - Google Patents
Vorrichtung mit einem magnetfeldgenerator und verfahren zur bereitstellung einer spulenanordnung Download PDFInfo
- Publication number
- WO2024175173A1 WO2024175173A1 PCT/EP2023/054193 EP2023054193W WO2024175173A1 WO 2024175173 A1 WO2024175173 A1 WO 2024175173A1 EP 2023054193 W EP2023054193 W EP 2023054193W WO 2024175173 A1 WO2024175173 A1 WO 2024175173A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- magnetic field
- coil layer
- layer
- conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/003—Printed circuit coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0017—Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/373—Design optimisation
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/392—Floor-planning or layout, e.g. partitioning or placement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/042—Printed circuit coils by thin film techniques
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/18—Chip packaging
Definitions
- the invention relates to a device having at least one magnetic field generator which has a coil arrangement with a plurality of coils, each of which has a plurality of turns.
- the invention also relates to a method for providing a coil arrangement for such a device.
- the device should be particularly suitable for testing, characterizing and/or calibrating magnetic field sensors. It is known to use permanent magnets or very large coil arrangements for this purpose, such as a Helmholtz coil or a cylindrical coil that surrounds the magnet-sensitive element of a magnetic field sensor.
- the invention is based on the object of specifying an improved device with at least one magnetic field generator with which the disadvantages mentioned are overcome.
- a method for providing a coil arrangement for such a device is to be specified.
- a device comprising at least one magnetic field generator, which has a coil arrangement with a plurality of coils, each of which has a plurality of turns, wherein the coil arrangement has a first planar coil layer with at least one coil and a second planar coil layer arranged parallel thereto with at least one coil, wherein the second planar coil layer is arranged at a distance from the first planar coil layer, wherein the coil arrangement is designed to generate a parallel magnetic field when the coil arrangement is electrically energized on the side of the first coil layer facing away from the second coil layer at a distance from the first coil layer, which parallel magnetic field has magnetic field lines parallel to the first coil layer.
- the parallel magnetic field is thus a magnetic field directed tangentially to the plane of the first planar coil layer.
- the second planar coil layer can thus be arranged in a plane parallel to the plane of the first planar track layer, and thus not in the same plane.
- the coils of the first and second planar track layers can have their planar extension in the x and y coordinate directions.
- the second planar track layer is then slightly spaced from the first planar track layer in the z direction.
- the coils of the first planar track layer can be arranged so as to overlap with the tracks of the second planar track layer.
- Such a coil arrangement with a first and a second planar coil layer can be provided relatively easily and inexpensively, e.g. by means of conductor tracks in corresponding conductor track layers of a printed circuit board (PCB).
- PCB printed circuit board
- the above-mentioned design of the coil arrangement can generate a relatively homogeneous magnetic field directed in a desired direction outside the area surrounded by the coil layers, i.e. the magnetic field sensor does not have to be arranged between the coil layers.
- the desired parallel magnetic field can be generated at a distance from the first coil layer that is at least 50% of the distance between the first coil layer and the second coil layer.
- the first coil layer and the second coil layer are designed as planar coil layers, i.e. the invention creates planar coils whose coil turns are thus arranged in one plane.
- the first planar coil layer can have two coils.
- the second planar coil layer can have two coils.
- the invention allows an advantageous, relatively inexpensive generation of directed and homogeneous magnetic fields in the sensitive plane of a magnetic field sensor without the need for wire-wound coils.
- the coil arrangement of the magnetic field generator according to the invention can therefore be implemented in a relatively small design, e.g. on an electrical circuit board.
- the invention has the advantage that permanent magnets allow the magnetic field to be set as desired by controlling the current supply to the coil arrangement and can be changed as desired during operation of the device.
- the parallel magnetic field generated by the magnetic field generator can be used to characterize a magnetic field sensor, to set its operating point and/or to compensate for external fields.
- a further advantage of the invention is that the coils of the coil arrangement can be manufactured cost-effectively and reproducibly, e.g. by using existing, widespread and established manufacturing techniques, such as the manufacture of electrical circuit boards.
- a generally unused space on the circuit board can advantageously be used to accommodate the coil arrangement, with the circuit board otherwise serving as a carrier and protection for the magnetic field sensor. This makes it possible to provide a separate and stable coil system associated with the magnetic field sensor, which is suitable for system calibration and characterization.
- a device with such a magnetic field generator can be realized with a coil design that is particularly robust against external interference fields.
- the device according to the invention can be used to characterize and calibrate a magnetic field sensor. It is also possible to exert a desired influence on its behavior during operation, e.g. by influencing the sensor characteristic curve using the parallel magnetic field and its control.
- the coil arrangement can be designed with only two external connections, via which an electrical current can be fed to the coil arrangement.
- the at least one coil of the first coil layer has an opposite winding direction to the at least one coil of the second coil layer. This makes it possible to generate a parallel magnetic field outside the area surrounded by the first and second coil layers, i.e. beyond the coil arrangement, in a particularly favorable manner.
- the coils of the first coil layer and/or the second coil layer are formed by conductor tracks of a printed circuit board (PCB).
- the conductor tracks form coil-like conductor loops.
- the circuit board has several conductor track layers, the first coil layer being formed on a first conductor track layer (conductor layer) and the second coil layer being formed on a second conductor track layer spaced apart from it. In this case, it is sufficient if a circuit board with two conductor track layers is used, for example a circuit board coated on both sides with conductor track material.
- the first coil layer can then be implemented on one conductor track layer of the circuit board, and the second coil layer on the other conductor track layer.
- the distance between the first and second coil layers then essentially corresponds to the thickness of the circuit board.
- multilayer circuit boards For example, a circuit board with four conductor track layers can also be used. Then, for example, the conductor layers arranged inside the circuit board can be used to implement the coil arrangement.
- conductor tracks of the first coil layer are connected to conductor tracks of the second coil layer by one or more through-contacts (vias).
- through-contacts vias
- the first coil layer in the area covered by the parallel magnetic field has a greater distance between turns of the at least one coil than outside the area covered by the parallel magnetic field. This ensures a high level of homogeneity of the parallel magnetic field. If the turns are implemented as conductor tracks, the first coil layer in the area covered by the parallel magnetic field has a greater distance between conductor tracks than outside the area covered by the parallel magnetic field.
- the second coil layer has concavely curved windings or conductor track sections that directly border the area covered by the parallel magnetic field.
- the conductor tracks can be routed around the area of the coil arrangement covered by the parallel magnetic field. This also ensures particularly good homogeneity of the parallel magnetic field.
- the device has at least one magnetic field sensor, in particular a magnetic field sensor in thin Layer technology, with a magnet-sensitive element that is arranged in the area of the parallel magnetic field.
- a magnetic field sensor in particular a magnetic field sensor in thin Layer technology
- the magnetic field generator can be used to measure and/or calibrate the magnetic field sensor.
- the magnetic field generator can also influence the sensor properties of the magnetic field sensor while it is in operation, e.g. by changing the characteristic curve of the magnetic field sensor in a desired way by controlling the parallel magnetic field.
- the object mentioned at the outset is also achieved by a method for providing a coil arrangement of a device of the type explained above, with the following steps: a) determining the installation space available for the coil arrangement, b) determining a desired area in which the parallel magnetic field is to be generated by the coil arrangement, c) arranging the conductor tracks of the first coil layer and the second coil layer on a circuit board, special virtual arrangement of the conductor tracks in a CAD program, d) simulating the magnetic field that can be generated by the coil arrangement with checking whether the parallel magnetic field meets the requirements, e) if the requirements are not met, continuing the process in step c), otherwise terminating the process.
- this makes it possible to realize the advantages explained above.
- this makes it possible to provide a coil arrangement for a magnetic field generator, through which a very homogeneous and relatively strong parallel magnetic field can be generated in the desired area.
- step c) c1) distributing the conductor tracks in the first and second coil layers, c2) determining the coil center distance and core diameter, c3) connecting the conductor tracks to form coil-like conductor loops.
- step c) and before step d) it is checked whether the distribution of the conductor tracks in the second coil layer is sufficiently suitable for the predetermined generation of the parallel magnetic field, and if this is not the case, enlarge the defined core diameter and continue with step c2), otherwise continue with step d).
- the coil arrangement and thus the magnetic field generator can be iteratively optimized for the desired application.
- a software simulation of the expected parallel magnetic field can be carried out to carry out the method step and optimization can be carried out in one or more iterative steps on the computer during the coil design.
- FIG. 2 the magnetic field generator according to Figure 1 with a magnetic field sensor
- Figure 3 - a side sectional view through the device according to Figure 2 showing the magnetic field
- Figure 7 the sequence of a method for providing a coil arrangement according to Figure 3.
- Figure 1 shows a device 1 with a magnetic field generator 2, which has a coil arrangement with several coils 3, 4, 5, 6.
- the coils 3, 4, 5, 6 are designed as planar coils with several turns 7.
- the coils 3, 4 are located in a first planar coil layer 12, i.e. in the same plane, and the coils 5, 6 are located in a second planar coil layer 13 arranged parallel to the first coil layer 12, thus in a plane parallel to the coil layer 12.
- the coils 3, 4 are connected to one another via a line.
- the coil 3 is connected to the coil 5 via a through-hole 8.
- the coil 4 is connected to the coil 6 via a through-hole 8.
- the coil arrangement 2 has two external connections 9, via which an electrical signal can be applied to the coil arrangement 2, which flows through the coils 3, 4, 5, 6.
- a parallel magnetic field is generated in the third coil layer 12, which is spaced from the first coil layer 12 and has magnetic field lines parallel to the first coil layer 12.
- Figure 2 shows the combination of the device 1 with the coil arrangement 2 with a magnetic field sensor 10, which has a magnet-sensitive element 11.
- the magnet-sensitive element 11 is arranged in the region of the parallel magnetic field that can be generated by the coil arrangement 2.
- Figure 3 illustrates this using a side sectional view.
- the coils 3, 4 in the first coil layer 12 and the coils 5, 6 in the second coil layer 13 can be seen.
- the vias 8 can also be seen.
- the magnetic field sensor 10 with the magnet-sensitive element 11 is arranged above the first coil layer 12.
- the arrows show the course of the magnetic field lines.
- the aforementioned parallel magnetic field 14 is generated above the first coil layer 12.
- the x and y components of the magnetic field lines in the area of the parallel magnetic field 14 run relatively homogeneously and also parallel to the plane of the first coil layer 12 and accordingly also tangential to the longitudinal extension of the magnet-sensitive element 11.
- FIG. 4 illustrates an advantageous design of the coils 3, 4, 5, 6 as well as an advantageous possibility of connecting these coils.
- the coils 3, 4, 5, 6 are connected in series.
- the coil 6 is connected to the coil 4 at the connection point B via a through-hole.
- the coil 3 is connected to the coil 5 at the connection point D via a through-hole.
- the coils 3 and 4 are connected to one another at the connection points C directly or via a conductor track section in the same coil layer.
- the connection points A and E are connected to the external connections 9.
- the coils 5, 6 in the second (lower) coil layer 13 ensure the highest possible magnetic field strength and, accordingly, sensitivity.
- the coils 3, 4 in the first (upper) coil layer 12 direct the magnetic field in a tangential plane to the first coil layer or to an electrical circuit board in which the first and second coil layers are implemented, and produce a homogeneous field distribution in the area of the parallel magnetic field 14.
- Xmax maximum available installation space in the x-direction (field direction of the parallel magnetic field 14)
- ymax maximum available installation space in the y-direction
- dmin minimum radius of an inner conductor loop
- Vx coil center distance in the x-direction
- v y core diameter of a coil pair
- pmin minimum conductor track spacing to be achieved
- P distance between the inner conductor tracks of coils 3, 4 (coil top)
- pbottom distance between the inner conductor tracks of coils 5, 6 (coil bottom)
- the dimensions Xmax and ymax indicate the total installation space required by the coils. This should be as large as possible. A high number of turns that can be achieved in a large installation space is advantageous in terms of the homogeneity of the field and the maximum field strength that can be achieved.
- Vx and v y denote the coil center distance of a coil pair and the core diameter of a single coil, respectively.
- a v y that is as large as possible reduces the field gradient in the y direction. It should be selected at least large enough so that all line sections run below the desired field level without bends.
- x should correspond to at least 1.7 times the length of the desired field level.
- Vx must be > (ymax - v y ). A larger distance is advantageous in terms of homogeneity.
- dmin is the minimum diameter, or twice the minimum radius of the innermost conductor loop. This is determined by the PCB technology used and the specifications of the PCB manufacturer. The limiting factor here is usually the minimum distance between a via set to connect the upper and lower coils and a conductor track running past it. A small dmin leads to more effective use of the possible installation space.
- the track spacing pmin is determined by the design specifications of the PCB manufacturer and the selected track width.
- the track width (not specified in the drawing here) should be as large as necessary to achieve a low ohmic resistance in the coil, but also as small as possible to achieve a maximum number of turns.
- the track spacing pbottom should be equal to pmin for a maximally homogeneous magnetic field.
- a minimal increase in pbottom results in an increase in the ma- maximum achievable field in the desired field plane, with only a slight deterioration in homogeneity.
- the distance between the upper coil (coil top) and the lower coil (coil bottom) is determined by the PCB technology selected (not specified in the drawing here). However, a distance should be aimed for that approximately corresponds to that between the upper coil and the desired field plane of the parallel magnetic field 14.
- An advantageous method for providing such a coil arrangement 2 can, as shown in Figure 7, proceed as follows.
- the available installation space can first be defined.
- the installation space should be as large as possible. It has a direct influence on the number of coil turns to be implemented and thus also on the achievable field strength and field homogeneity.
- the installation space available on the circuit board must be taken into account, particularly when implementing on a circuit board.
- a target area can be defined.
- the target area is the area in which the parallel magnetic field to be generated tangentially to the circuit board surface is to be created in the coil arrangement and should be as homogeneous as possible.
- the areas 80 can be defined as the target area, which are, so to speak, a projection of the parallel magnetic field to be generated into the areas of the planar coil layers.
- a step 72 the distribution of the conductor tracks on the circuit board is then carried out in the coil levels, ie in the first coil layer and the second coil layer. It is advantageous to place the outer conductor tracks as closely as possible in the first coil layer. The inner conductor tracks should use the available space evenly. It is also advantageous to place all conductor tracks in the second coil layer so as far as possible on the outside and not to cover the target area 80 substantially.
- the coil center distance and core diameter are then determined.
- the maximum values for the coil center distance and the core diameter are defined by the conductor track width, the conductor track distance and the number of coil turns.
- areas 81 can already be reserved for the vias 8.
- the conductor tracks are connected to form conductor loops.
- the conductor loops can at least partially cover the target area 80.
- the conductor loops are formed in such a way that the target area 80 is essentially left out. In this way, for example, two eyeglass-like coils can be created in the second coil layer 13.
- the conductor tracks should be connected to form conductor loops using the shortest possible route. The connection is made using circular tracks and conductor tracks at a 45 degree angle.
- the conductor tracks are then distributed in the coil planes, i.e. the first coil layer and the second coil layer.
- the conductor loop geometry in the second coil layer can be evaluated: If there are no or only very short straight conductor tracks, so that the target area 80 is covered too much, the core diameter can be increased, for example.
- step 76 it is checked whether the geometry in the second coil layer is suitable for fulfilling the requirements of the parallel magnetic field 14 to be generated. If this is not the case, the process continues with step 73, e.g. by increasing the core diameter in the second coil layer 13.
- step 76 continues with step 77.
- the magnetic field resulting when the coil arrangement is energized, at least in the X direction can be checked by simulation.
- relevant evaluation criteria for the suitability of the resulting magnetic field can be the homogeneity of the magnetic field in the plane of the desired parallel magnetic field, ie in the target area, and the sensitivity of the coil arrangement in relation to the target area in T/A.
- the parameters determined from the simulation are checked, for example whether the homogeneity and the sensitivity reach the desired values. If this is not the case, the process branches back to step 72.
- the homogeneity of the magnetic field can then be improved there by changing the number of turns and/or the coil center distance. If the field strength is insufficient, the number of turns and/or the conductor path distance in the second coil layer can be changed, for example.
- step 78 If it is determined in step 78 that the desired criteria are met, the process continues with step 79. There, the conductor loops are connected to a coil system, i.e. to the finished coil arrangement 2 as shown in Figure 1.
- the conductor loops can, for example, be connected in such a way that the impairment of symmetry is as small as possible.
- the four individual coils are then connected in series.
- the steps mentioned can be carried out in whole or at least in part in a circuit board design program.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Architecture (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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- Magnetic Resonance Imaging Apparatus (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2023/054193 WO2024175173A1 (de) | 2023-02-20 | 2023-02-20 | Vorrichtung mit einem magnetfeldgenerator und verfahren zur bereitstellung einer spulenanordnung |
| US19/305,309 US20250372289A1 (en) | 2023-02-20 | 2025-08-20 | Device comprising a magnetic field generator, and method for providing a coil arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2023/054193 WO2024175173A1 (de) | 2023-02-20 | 2023-02-20 | Vorrichtung mit einem magnetfeldgenerator und verfahren zur bereitstellung einer spulenanordnung |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US19/305,309 Continuation US20250372289A1 (en) | 2023-02-20 | 2025-08-20 | Device comprising a magnetic field generator, and method for providing a coil arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024175173A1 true WO2024175173A1 (de) | 2024-08-29 |
Family
ID=85328756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/054193 Ceased WO2024175173A1 (de) | 2023-02-20 | 2023-02-20 | Vorrichtung mit einem magnetfeldgenerator und verfahren zur bereitstellung einer spulenanordnung |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20250372289A1 (de) |
| WO (1) | WO2024175173A1 (de) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016021260A1 (ja) * | 2014-08-07 | 2016-02-11 | アルプス・グリーンデバイス株式会社 | 磁気センサーおよびその磁気センサーを備えた電流センサー |
| US20190339306A1 (en) * | 2017-02-02 | 2019-11-07 | Alps Alpine Co., Ltd. | Balance type current sensor |
| US20210184500A1 (en) * | 2019-12-12 | 2021-06-17 | Gan Systems Inc. | High efficiency resonator coils for large gap wireless power transfer systems |
-
2023
- 2023-02-20 WO PCT/EP2023/054193 patent/WO2024175173A1/de not_active Ceased
-
2025
- 2025-08-20 US US19/305,309 patent/US20250372289A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016021260A1 (ja) * | 2014-08-07 | 2016-02-11 | アルプス・グリーンデバイス株式会社 | 磁気センサーおよびその磁気センサーを備えた電流センサー |
| US20190339306A1 (en) * | 2017-02-02 | 2019-11-07 | Alps Alpine Co., Ltd. | Balance type current sensor |
| US20210184500A1 (en) * | 2019-12-12 | 2021-06-17 | Gan Systems Inc. | High efficiency resonator coils for large gap wireless power transfer systems |
Also Published As
| Publication number | Publication date |
|---|---|
| US20250372289A1 (en) | 2025-12-04 |
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