EP4094278A1 - Noyau magnétique d'ensemble électronique - Google Patents

Noyau magnétique d'ensemble électronique

Info

Publication number
EP4094278A1
EP4094278A1 EP20839088.0A EP20839088A EP4094278A1 EP 4094278 A1 EP4094278 A1 EP 4094278A1 EP 20839088 A EP20839088 A EP 20839088A EP 4094278 A1 EP4094278 A1 EP 4094278A1
Authority
EP
European Patent Office
Prior art keywords
magnetic core
cover
base
central region
central
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.)
Pending
Application number
EP20839088.0A
Other languages
German (de)
English (en)
Inventor
Jan Hansen
Konstantin Spanos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4094278A1 publication Critical patent/EP4094278A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/067—Core with two or more holes to lead through conductor

Definitions

  • the present invention relates to a magnetic core of an electronic arrangement with optimized space utilization, as well as an electronic arrangement comprising such a magnetic core.
  • U-shaped or E-shaped magnetic cores are known, as described, for example, in DE 3333460 A1.
  • Such magnetic cores usually take up a lot of space compared to other electronic components, which means that the magnetic cores are largely responsible for the space required for the power electronic components.
  • the magnetic core according to the invention with the features of claim 1 offers the advantage of a geometry that is optimized with regard to space requirements.
  • a high inductance of the magnetic core is made possible with an overall low height and length of the magnetic core.
  • this is achieved by a magnetic core which comprises a central area, a base and a cover.
  • the bottom is in the form of a flat plate.
  • An essentially plate-shaped part is regarded as a flat plate, which part has at least one flat upper side, the upper side pointing in particular in the direction of the central region.
  • the bottom is preferably designed as a cuboid. In principle, however, other geometric shapes of the bottom are also possible, for example as curved plate, or as a segment of a circle, with at least part of the top of the floor being flat.
  • the central area is arranged between the base and the cover.
  • a through opening is formed which has a center line.
  • the through opening is in particular formed completely in the central area.
  • the through opening preferably has a rectangular or square cross section.
  • a first cross-sectional area of the central region in a first cutting plane is essentially the same as a second cross-sectional area of the magnet core in a second cutting plane.
  • the first cutting plane is parallel to the ground and is arranged in such a way that the center line lies in the first cutting plane.
  • Half of the first cross-sectional area thus corresponds to a magnetic cross-sectional area of the central region.
  • the second cutting plane is perpendicular to the first cutting plane and is also arranged in such a way that the center line lies in the second cutting plane.
  • half of the second cross-sectional area corresponds to a magnetic cross-sectional area of the base and the lid.
  • the size of these first and second cross-sectional areas and thus the magnetic cross-sectional areas are largely responsible for the inductance of the magnetic core.
  • the first cross-sectional area and the second cross-sectional area are preferably exactly the same size.
  • the base and the cover protrude over the central area on at least two mutually opposite sides in the direction of the center line.
  • a first length of the central region of the magnetic core in the direction of the center line is smaller than a second length of each of the bottom and the cover in the direction of the center line.
  • the base and the cover each form a type of canopy that protrudes over the central area.
  • the present magnetic core allows a length of an apparatus in which the magnetic core is used to be shortened while maintaining a height of the magnetic core.
  • a printed circuit board is arranged in the through opening.
  • the design of the bottom and the cover so that they protrude in the direction of the center line the advantage that they can each have a smaller dimension in the direction of a Z-axis perpendicular to the first cutting plane, while still ensuring the required size of the first cross-sectional area can be.
  • a magnetic core with high inductance with a particularly low overall height in the direction of the Z-axis can be provided. That is to say, in particular, the special geometry of the magnetic core while maintaining the inductance allows the length of the magnetic core to be shortened in the central area, the overall height not having to be increased. In order to ensure the required cross-sectional area of the central region in the first cutting plane, it can be widened in the transverse direction, for example.
  • the magnetic core is preferably formed from a material which has a ferrite and / or an iron powder material.
  • Magnetic cores of this type are produced, for example, by means of sintering or pressing, in particular in a mold, as a result of which particularly simple and inexpensive production is possible with flexible shaping.
  • the base and the cover each protrude by at least 5%, preferably at least 10%, particularly preferably a maximum of 50%, of a length of the central region in order to enable a particularly compact geometry of the magnetic core with regard to a longitudinal extension of the central region.
  • the central region particularly preferably has a first height in a direction perpendicular to the floor, the first height being at least 10%, preferably at least 20%, preferably at most 40% and particularly preferably 30% Total height of the magnetic core in the direction perpendicular to the floor. This ensures an optimal geometry of the magnetic core with regard to the height of the magnetic core, in particular in order to achieve a low overall height with a high desired inductance and sufficient space for further electronic components.
  • the base and the cover preferably protrude over the central area on both sides in the direction of the center line.
  • the base and the cover protrude symmetrically over the central area, that is, the magnetic core preferably has a symmetrical geometry with respect to a transverse plane perpendicular to the center line.
  • the magnetic core When viewed from the side, the magnetic core has a T-shape.
  • the through opening extends from the bottom to the cover. That is to say, the through opening divides the central area in particular into two separate areas.
  • the central area thus preferably comprises a first wall and a second wall.
  • the two walls are, for example, each arranged at a predefined distance from the center line.
  • the walls can have any cross-section.
  • Each of the walls particularly preferably has a rectangular cross section. A particularly simple and inexpensive manufacture of the magnetic core is possible as a result.
  • the base and the cover are preferably designed in the form of two cuboid plates.
  • the two plates preferably have an identical geometry.
  • the two plates can also have different geometries, for example different widths, as long as the cross-sectional areas remain the same.
  • the two plates are preferably arranged parallel to one another, and in particular perpendicular to the two walls.
  • the magnetic core is particularly easy to manufacture and enables a large magnetic cross-sectional area in the area of the base and cover.
  • the magnetic core is advantageously designed in two parts.
  • the base is preferably provided separately from the central area, which is in particular formed in one piece with the cover.
  • the bottom and the central area can preferably be connected to one another, for example by means of a Adhesive connection or by means of a plug connection, the plug connection being made possible in particular by means of a plug element made of plastic into which the bottom and central area are plugged.
  • the bottom and the central area can be disconnected.
  • a gap is preferably formed between the central region and the base. That is, the magnetic core consists of two separate parts, which are arranged at a predefined minimum distance from one another, so that the gap is formed between them.
  • a first part here comprises the central region and the cover, the central region and the cover preferably being formed in one piece with one another.
  • a second part of the magnetic core is preferably the base, which is arranged in such a way that the gap is present between it and the central region.
  • the construction with a gap can prevent core saturation at high currents.
  • the magnetic core preferably comprises a spacer in order to ensure the gap between the two parts of the magnetic core.
  • the spacer is preferably formed from a magnetically non-conductive material, for example plastic.
  • the two parts can be connected to one another by a plug connection by means of a plug element, the plug element in particular forming the spacer.
  • the middle area, base and cover are designed in one piece. This means that when viewed in the direction of the center line, a one-piece, essentially O-shaped magnetic core that is closed in the circumferential direction, in particular without a gap, is obtained.
  • the magnetic core preferably comprises two central areas, each with a through opening.
  • the two central areas are arranged directly adjacent to one another in a direction perpendicular to the second sectional plane.
  • the two through openings are preferably parallel to one another.
  • the magnetic core is thus in particular E-shaped.
  • a part of the circuit board can be arranged in each of the two through openings.
  • the two middle areas are preferably designed in one piece, that is, a middle wall is preferably arranged between the two through openings, which is formed in particular from the two adjoining walls of the two middle areas.
  • the central wall thus preferably has twice the cross-sectional area of one of the walls of the central areas.
  • the first cross-sectional areas of the two central regions are considered separately. That is to say, each of the two central regions has a separate first cross-sectional area which is essentially the same as the second cross-sectional area in the second cutting plane.
  • a gap is provided between the central wall and the floor, with the outer walls in particular resting against the floor without a gap.
  • a gap can preferably also be provided between the outer walls and the floor.
  • the invention leads to an electronic arrangement which comprises a magnetic core as described above and a printed circuit board.
  • the electronic arrangement can be a power electronic component, in particular for use in a vehicle, such as, for example, in a control unit of a vehicle.
  • the circuit board protrudes through the through opening of the magnetic core and is arranged parallel to the bottom of the magnetic core.
  • the magnetic core enables, in particular, a current smoothing or a filtering of line-bound interference in the operation of the electronic arrangement.
  • the electronic arrangement can preferably further comprise a housing within which the printed circuit board and the magnetic core are arranged.
  • the electronic arrangement preferably further comprises at least one electronic component which is arranged on the circuit board.
  • the electronic component is arranged at least partially covered by the base and cover of the magnetic core, whereby the electronic arrangement is kept particularly compact. That is to say, the electronic component is preferably arranged at least partially within a space defined by the cover and the base.
  • the electronic component can, for example, be a capacitor or another surface-mounted component, also called a surface-mounted device, or SMD for short. Due to the special Geometry of the magnetic core with the shortened axial length in the area of the printed circuit board, particularly in the direction of the center line, a particularly small dimension of the electronic arrangement can be achieved, with the overall height of the magnetic core and the electronic arrangement being maintained.
  • the electronic arrangement is therefore preferably suitable in applications with limited installation space, such as in control units in a vehicle.
  • Figure 1 is a perspective view of an electronic arrangement with a magnetic core according to a first embodiment of the invention
  • Figure 2 is a sectional view of Figure 1
  • Figure 3 is a further sectional view of Figure 1,
  • FIG. 4 shows an electronic arrangement with a magnetic core in accordance with a second exemplary embodiment of the invention
  • FIG. 5 shows an electronic arrangement with a magnetic core in accordance with a third exemplary embodiment of the invention.
  • Figures 1 to 3 show an electronic arrangement 10 with a magnetic core 1 according to a first embodiment of the invention.
  • an X-axis, a Y-axis and a Z-axis are drawn in perpendicular to one another.
  • FIG. 1 shows a perspective view of the electronic arrangement 10.
  • FIG. 2 shows a sectional view of FIG second cutting plane 7 is defined by the X-axis and the Z-axis.
  • FIG. 3 shows a further sectional view of FIG. 1 with an alternative first cutting plane 6 which is defined by the X-axis and the Y-axis.
  • a first section line 6 'corresponding to the section in the first section plane 6 and a second section line 7' corresponding to the section in the second section plane 7 are each indicated by dashed lines on the magnet core 1.
  • the electronic arrangement 10 is arranged in particular within a housing, a housing base 11 of the housing being indicated schematically in FIGS. 1 to 3.
  • the electronic arrangement 10 comprises the magnetic core 1 and a printed circuit board 20.
  • the printed circuit board 20 extends along the X axis and is in particular arranged in the first sectional plane 6 defined by the X axis and the Y axis.
  • the magnetic core 1 has a through opening 2 with a center line X, the center line X corresponding to the X axis.
  • the circuit board 20 extends through the through opening 2.
  • the through opening 2 has a rectangular cross section and is formed in a central region 3 of the magnet core 1.
  • the through opening 2 separates the central area 3 into two separate walls 31, 32, as can be seen in particular in FIG.
  • the two walls 31, 32 are preferably connected to one another by means of a connecting region 49, for example in order to optimally utilize the available installation space and / or to facilitate production.
  • the two walls 31, 32 are designed symmetrically to the center line X, that is, the two walls 31, 32 are each arranged at a predefined distance 36 from the center line X, each extend parallel to the Z axis and each have the same in the first sectional plane , substantially rectangular, wall cross-sectional area 91, 92.
  • the magnetic core 1 comprises a base 4a and a cover 4b, which are each designed as essentially cuboid, flat plates. Between the bottom 4a and the cover 4b, in particular in the direction of Z-axis, the central area 3 is arranged.
  • the cover 4b and the central region 3 are formed in one piece, as a result of which a U-shaped solid body results when viewed in the direction of the center line X.
  • the bottom 4a and the central region 3 are arranged directly adjacent to one another, that is to say without gaps.
  • the middle area 3 and the cover 4b have the same second width 70 in the direction of the Y-axis.
  • a first width 42 of the base 4 a is slightly larger, but can alternatively also be equal to the second width 70.
  • the central region 3 has a first length 30 that is different from the base 4a and cover 4b.
  • the first length 30 of the central region 3 is 30% smaller than a second length 40 of each of the bottom 4a and the cover 4b.
  • the central area 3 and the base 4a and the cover 4b are arranged in such a way that the base 4a and cover 4b each protrude in the direction of the central line X over the central area 3 in a manner similar to a canopy.
  • electronic components 60 are generally significantly smaller than the magnetic core 1, as a result of which they can be arranged on the circuit board 20 in such a way that they are at least partially covered by the base 4a and the cover 4b. That is to say, the electronic components 60 are in this case at least partially arranged within a space which is defined by the base 4a and cover 4b.
  • a particularly space-saving overall size of the electronic arrangement 10 can be made possible, which is particularly advantageous when used, for example, in a control unit of a motor vehicle, where there is usually very limited space.
  • the installation space is usually limited, in particular in the direction of the center line and / or the Z-axis, the special construction with center area 3, base 4a and cover 4b enabling optimal use of the space and thus enabling a high inductance of the particularly compact magnetic core 1 .
  • the magnetic core 1 is specially designed so that it has a very high inductance despite the particularly compact geometry in order to ensure a high level of effectiveness, for example for filtering electrical and / or magnetic interference.
  • the middle area 3, the base 4a and the cover 4b are designed in such a way that the same cross-sectional areas 8, 9 are present, which in each case optimally use the available installation space.
  • a second cross-sectional area 8 corresponds to the entire sectional area shown in FIG. 2 in the second cutting plane 7, which is defined by the X-axis and the Z-axis. That is, the second cross-sectional area 8 corresponds to the sum of the two cross-sectional areas 81, 82 of the base 4a and cover 4b.
  • the two cross-sectional areas 81, 82 of base 4a and cover 4b each correspond to the magnetic cross-sectional area of cover 4b and base 4a, respectively.
  • a first cross-sectional area 9 also corresponds to the total cut area shown in FIG. 3 in the first cutting plane 6. That is, the first cross-sectional area 9 corresponds to the sum of the two cross-sectional areas 91, 92 of the two walls 31, 32 the two walls 31, 32 each correspond to the magnetic cross-sectional area of the central region 3.
  • FIG. 4 shows an electronic arrangement 10 with a magnetic core 1 according to a second exemplary embodiment of the invention.
  • the second embodiment essentially corresponds to the first embodiment of Figures 1 to 3, with the difference that the cover 4b has a larger second axial length 40 ', and that between the Central region 3 and the bottom 4a a gap 15 is formed.
  • the second axial length 40 ' is at least 10% greater than the first axial length 40 of the base 4a.
  • the cover 4b which is longer in the direction of the center line, nevertheless ensures a sufficiently large second cross-sectional area 8 of the cover 4b in order to ensure a high inductance of the magnetic core 1.
  • the gap 15 can be ensured, for example, by a spacer (not shown) made of a magnetically non-conductive material.
  • the bottom 4a and the middle area 3 can each be inserted into a plug-in element in order to preferably ensure a plug-in connection between the bottom 4a and the middle area 3, wherein the plug-in element can for example form the spacer.
  • FIG. 5 shows an electronic arrangement 10 with a magnetic core 1 according to a third exemplary embodiment of the invention.
  • the third exemplary embodiment essentially corresponds to the first exemplary embodiment in FIGS. 1 to 3, with the difference that two central areas 3a, 3b are provided, each with a through opening 2a, 2b.
  • the two central regions 3a, 3b are each arranged between the base 4a and the cover 3 and directly adjoining one another along a direction perpendicular to the second sectional plane 7a, 7b.
  • a virtual interface 45 is identified between the two central regions 3a, 3b.
  • a second wall 32 of the first central region 3a and a first wall 31 of the second central region 3b are formed in one piece as a central wall 3c.
  • the middle wall 3c thus has twice the cross-sectional area of the individual walls 31, 32.
  • the cross-sectional areas of the two central regions 3a, 3b are considered separately in the third exemplary embodiment. That is, the whole Cross-sectional area of the magnetic core 1 in the first cutting plane 6 is twice the first cross-sectional area 8 of each of the central areas 3a, 3b, the second cutting plane 7a, 7b being defined separately for each central area 3a, 3b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un noyau magnétique (1) d'un ensemble électronique, le noyau comprenant une région centrale (3), une base (4a) prenant la forme d'un panneau plat, et un couvercle (4b), la région centrale (3) étant disposée entre la base (4a) et le couvercle (4b) ; une ouverture traversante (2), dotée d'une ligne centrale (X), est formée dans la région centrale (3) ; une première superficie en section transversale (9) du noyau magnétique (1), sur un premier plan de coupe (6) parallèle à la base (4a) et sur lequel se trouve la ligne centrale (X), est sensiblement égale à une seconde superficie en section transversale (8) du noyau magnétique (1) sur un second plan de coupe (7) perpendiculaire au premier plan de coupe (6) et sur lequel se trouve la ligne centrale (X) ; et la base (4a) et le couvercle (4b) font saillie au-delà de la région centrale (3) dans la direction de la ligne centrale (X) au niveau d'au moins deux faces situées à l'opposé l'une de l'autre.
EP20839088.0A 2020-01-21 2020-12-23 Noyau magnétique d'ensemble électronique Pending EP4094278A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020200619.9A DE102020200619A1 (de) 2020-01-21 2020-01-21 Magnetkern einer elektronischen Anordnung
PCT/EP2020/087746 WO2021148219A1 (fr) 2020-01-21 2020-12-23 Noyau magnétique d'ensemble électronique

Publications (1)

Publication Number Publication Date
EP4094278A1 true EP4094278A1 (fr) 2022-11-30

Family

ID=74175850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20839088.0A Pending EP4094278A1 (fr) 2020-01-21 2020-12-23 Noyau magnétique d'ensemble électronique

Country Status (6)

Country Link
US (1) US20230050004A1 (fr)
EP (1) EP4094278A1 (fr)
JP (1) JP2023511355A (fr)
CN (1) CN114930475A (fr)
DE (1) DE102020200619A1 (fr)
WO (1) WO2021148219A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333460A1 (de) 1983-09-16 1985-04-04 Brown, Boveri & Cie Ag, 6800 Mannheim Magnetkern
JP2005286117A (ja) * 2004-03-30 2005-10-13 Tdk Corp プレーナー型フェライトコア
CN204680522U (zh) * 2015-05-13 2015-09-30 遂宁普思电子有限公司 电感器
CN106571732B (zh) * 2015-10-09 2019-03-05 台达电子工业股份有限公司 电源变换装置

Also Published As

Publication number Publication date
CN114930475A (zh) 2022-08-19
JP2023511355A (ja) 2023-03-17
WO2021148219A1 (fr) 2021-07-29
US20230050004A1 (en) 2023-02-16
DE102020200619A1 (de) 2021-07-22

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