EP4042456A1 - Gleichtaktdrossel - Google Patents
GleichtaktdrosselInfo
- Publication number
- EP4042456A1 EP4042456A1 EP20785721.0A EP20785721A EP4042456A1 EP 4042456 A1 EP4042456 A1 EP 4042456A1 EP 20785721 A EP20785721 A EP 20785721A EP 4042456 A1 EP4042456 A1 EP 4042456A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mode choke
- common mode
- coil
- circuit carrier
- toroidal core
- 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.)
- Granted
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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F2017/0093—Common mode choke coil
-
- 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
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
- H01F2027/065—Mounting on printed circuit boards
Definitions
- the invention relates to a common mode choke.
- the common mode choke has an in particular magnetically permeable toroidal core, in particular a ferrite core, and at least one coil and one further coil.
- the coil and the further coil are each arranged in the area of the toroidal core in such a way that a magnetic flux penetrating the coils detects the toroidal core.
- EMC electro-magnetic compatibility
- common-mode chokes have at least two or only two coils, which can interact magnetically via a toroidal core.
- the coil current in the two coils is preferably conducted in mutually different directions, so that EMC disturbances in the toroidal core magnetically cancel each other out.
- the toroidal core of the common mode choke of the type mentioned at the beginning encloses an in particular cylindrical or angular, in particular cuboid, opening.
- the coils each have at least one or only one electrical inner conductor, in particular a busbar, for each coil turn.
- the inner conductor is arranged in the opening, the inner conductors arranged in the opening - in particular in cross section - jointly forming a shape corresponding to the opening, and thus jointly filling the opening.
- the coils each have at least two or only two coil turns.
- the coil turn comprises an inner conductor and an outer conductor, which are electrically connected to one another.
- the outer conductor is preferably designed, the coil current from the inner conductor lead away and around the toroidal core.
- the common-mode choke preferably has a connecting element, an electrical connection of the inner conductor of a coil turn to an outer conductor of the further coil turn being formed by the electrical connecting element, which in particular extends flatly.
- the coil turns formed in this way are preferably formed by a plurality of electrically connected, in particular soldered or welded, current-conducting elements.
- the coil can thus advantageously be made conductive for large currents, assembled in a modular manner from individual modules or parts.
- the inner conductor which is decisive for the coil inductance, can furthermore advantageously be embodied as compactly as possible in the center, in particular in the cavity, with the other inner conductors arranged in a sealed manner.
- the coil can thus advantageously form the greatest possible inductance in the smallest possible installation space. This is because it was recognized that the impedance of a common mode choke can be effectively increased if the cross-sectional area of the opening can be fully energized by the inner conductors.
- the connecting element and / or the outer conductor is formed by a piece of sheet metal, in particular a stamped grid, also called a lead frame.
- the connecting element and / or the outer conductor can thus advantageously be provided with little effort.
- electrical connections of the coils are connected to a circuit carrier, the connecting element being spaced from the circuit carrier.
- the connecting element can thus advantageously be arranged at a distance from the circuit carrier.
- the connecting element can thus advantageously form a small capacitance with the circuit carrier, provided that a gap, in particular an air gap, is formed between the connecting element and the circuit carrier.
- IMS insulated metal substrate
- AMB active metal brazed
- DCB direct copper bonded
- LTCC substrate Low-Temperature- Cofired-Ceramics
- HTTC substrate High-Temperature-Cofired-Ceramics.
- the circuit carrier is part of the common mode choke.
- the inner conductors each have a cross-section in the shape of a segment of a circle.
- the opening of the toroidal core is preferably designed to be cylindrical.
- the inner conductors which contribute to a large extent to the formation of inductance in the coil, can be arranged in the opening in such a compact manner, in particular completely filling the opening together.
- the opening is also preferably cylindrical.
- the opening is cuboid or cube-shaped.
- the inner conductors are preferably square, rectangular in cross section, or square. In this way, the common-mode choke can advantageously be provided with inner conductors, which can be provided at low cost by means of roll forming.
- the inner conductors are preferably each designed as a straight rod, in particular. In this way, the inner conductors can advantageously be provided with little effort by an extruded profile or a rolled profile and by being separated from a rod.
- the common mode choke has an electrically insulating insulating body which at least partially encloses the inner conductors and insulates them from one another.
- the inner conductors can advantageously be electrically isolated from one another and from the toroidal core.
- the insulating body preferably forms an electrically insulating sheath which encloses the toroidal core.
- the outer conductors can also advantageously be insulated from the toroidal core.
- the common mode choke comprises a circuit carrier.
- the circuit carrier has an electrically insulating layer, and at least one electrically conductive layer.
- the electrically insulating layer is preferably a ceramic layer and the electrically conductive layer is preferably a copper layer.
- the inner conductor is connected to an electrically conductive layer of the circuit carrier in the area of an end face of the inner conductor.
- the outer conductor is connected to an electrically conductive layer of the circuit carrier in the area of a soldering foot of the outer conductor.
- the inner conductor and the outer conductor are preferably connected by means of a connecting element which is spaced apart from the circuit carrier and which is materially connected, in particular soldered or welded, to the electrically conductive layers of the circuit carrier.
- the connecting element is thus spaced from the circuit carrier by a gap, in particular an air gap, and thus cannot form any parasitic capacitance with the circuit carrier, in particular an electrically conductive rear side layer of the circuit carrier.
- the coil turns of the coil which end in the area of the circuit carrier on the inner conductor or on the outer conductor, are thus electrically connected to one another via the connecting element. Due to the spacing from the circuit carrier, this electrical connection can advantageously only form a small parasitic capacitance.
- an electrically insulating support element is arranged between the connecting element and the circuit carrier.
- the support element is, for example, a ceramic element or a plastic element.
- the soldered connections of the common-mode choke can thus advantageously be relieved when the common-mode choke vibrates.
- the connecting element is materially connected to the inner conductor and the outer conductor, in particular welded or soldered.
- an end section of the connecting element is preferably connected to an end face of the inner conductor, and an opposite end section of the connecting element to the outer conductor, preferably welded, in particular spot-welded, or soldered or sintered.
- the connecting element is preferably formed by a piece of sheet metal, in particular a stamped grid or lead frame. The connecting element can thus be provided at low cost.
- the connecting element has a thickness dimension which is made smaller than a thickness dimension of the, in particular, outer, electrically conductive layers of the circuit carrier. In this way, a gap can advantageously be produced between the connecting element and the circuit carrier, as a result of which parasitic capacitances are reduced.
- FIG. 1 shows an exemplary embodiment for a common mode choke, of which winding parts are shown in a V-shaped sectional illustration through the inner conductors of a coil winding;
- FIG. 2 shows the common mode choke shown in FIG. 1 in a plan view
- FIG. 3 shows part of a common mode choke in which part of an electrical connection between coil windings is spaced from a substrate;
- FIG. 4 shows an example of a common mode choke with a square toroidal core.
- FIG. 1 shows - schematically - an exemplary embodiment for a common mode choke 1.
- the common mode choke 1 comprises a toroidal core 5 which encloses a cavity 4 which is designed as a breakthrough in the toroidal core 5.
- the common-mode choke 1 also comprises a rod-shaped inner conductor 2 and a rod-shaped inner conductor 3.
- the inner conductors 2 and 3 are each part of mutually different coil turns of the same coil of the common-mode choke 1.
- the inner conductors 2 and 3 fill the hollow space 4 in this cross-section Embodiment half off.
- the remaining half of the cavity is filled by two further inner conductors, which are shown in FIG. 2 below.
- a gap 29 is arranged between the inner conductors 2 and 3.
- the gap 29 can be filled, for example, with an insulator, in particular made of plastic or ceramic.
- the cavity 4 is designed as a hollow cylinder.
- the inner conductor 2 has an end face 6 which is electrically connected, in particular welded, to an end section 10 of an outer conductor 8.
- the outer conductor 8 is angled and encloses the toroidal core 5.
- the outer conductor 8 has an end section which is opposite to the end section 10 and which is designed as a soldering foot 12. Together with the inner conductor 2, the outer conductor 8 forms part of a coil winding which surrounds the toroidal core 5.
- the inner conductor 3 is connected to an end section 11 of an outer conductor 9.
- the outer conductor 9 has a soldering foot 13 which is formed on an end of the outer conductor 9 opposite to the end section 11.
- the outer conductors 8 and 9 are designed as a lead frame or lead frame.
- FIG. 1 also shows a circuit carrier 39, comprising an electrically insulating ceramic layer 19, an electrically conductive back layer 20, in particular a copper layer, and electrically conductive layers which are formed on a side of the ceramic layer 19 opposite the electrically conductive back layer 20.
- the electrically conductive layers thus form conductor tracks and can be part of a circuit arrangement for rewiring.
- the circuit carrier 39 comprises an electrically conductive layer 28, in particular a rewiring layer, which is connected to the inner conductor 2, and there the end face of the inner conductor 2, by means of a solder 22.
- the soldering foot 12 is connected to a connecting element 18 by means of a soldering agent 22 connected, which is formed in this embodiment as a sheet metal piece, in particular a lead frame or lead frame.
- the connecting element 18 is spaced apart from the ceramic layer 19, and thus from the circuit carrier 39, by means of a gap 21, in particular an air gap.
- the circuit substrate 39 comprises the electrically insulating ceramic layer 19, the electrically conductive rear side layer 20 and the electrically conductive layer 28.
- the circuit substrate 39 is part of a contact arrangement, comprising the circuit substrate 39 and the common mode choke 1
- a support element 23, in particular a plastic element, is arranged between the common mode choke 1 and the circuit carrier 39 in an area of the common mode choke 1 in which the connecting element 18 is arranged.
- the common mode choke 1 can thus support against the circuit carrier 39.
- the connecting element 18 thus forms a part of the coil which connects the coil turns of the coil to one another.
- the soldering foot 13 is soldered to an electrically conductive layer 27 of the circuit carrier 39 by means of solder 22.
- the soldering foot 13 thus forms an external electrical connection of the coil winding of the common mode choke 1.
- the coil current through the coil can now run as follows:
- a coil current can thus be introduced from the electrically conductive layer 27 into the soldering foot 13 of the coil, and there - as indicated by the arrows - flow via the outer conductor, the end section 11 of the outer conductor, the end face 7 of the inner conductor 3, through the inner conductor 3 , and there a magnetic field generate, which can be reinforced by the toroidal core 5.
- the current then continues to flow via the end face 41 to the connecting element 18 and is passed through the connecting element 18 to the soldering foot 12 of the outer conductor 8.
- the current can then be conducted further through the outer conductor 8 to the end section 10 of the outer conductor 8, and from there via the end face 6 of the inner conductor 2 through the inner conductor 2, in order to then reach the electrically conductive layer 28 via the end face 42.
- FIG. 2 shows the common mode choke 1 already shown in FIG. 1 in a plan view of the inner conductors and the toroidal core 5.
- the toroidal core 5 encloses a cylindrical opening 4 in which the inner conductors 2 and 3 are arranged.
- FIG. 2 also shows a V-shaped section line 46 for the section shown in FIG. 1 through the coil in the area of the inner conductors 2 and 3.
- Two further inner conductors 14 and 15 are arranged in the opening 4, each of which is part of a further coil.
- the inner conductors 2, 3, 14 and 15 are each formed in cross section in the shape of a segment of a circle, in particular a segment of a circle. The inner conductors 2, 3, 14 and 15 thus completely fill the opening 4 - with the exception of an insulation distance between the inner conductors.
- FIG. 2 also shows the outer conductors 8 and 9 already shown in FIG. 1, the outer conductor 8 being welded with an end section 10 to the inner conductor 2, and the outer conductor 9 being welded to the end section 11 with the inner conductor 3.
- the common mode choke shown in Figure 2 also includes an outer conductor 16, which is electrically connected to the inner conductor 14, in particular welded or soldered, and an outer conductor 17, which is electrically connected to the inner conductor 15, in particular welded or soldered.
- the outer conductors 8, 9, 16 and 17 each form a type of wing, which extends from the connection point with the respective inner conductor transversely to the longitudinal extension of the inner conductor enclosing the toroidal core 5, and thus forms a type of seagull wing.
- the gap in the opening 4, which extends between the inner conductors and between the inner conductors and the toroidal core 5, can be filled, for example, by means of a plastic compound, a potting compound or a plastic element which is designed to be electrically insulating.
- the inner conductors are electrically isolated from one another and from the toroidal core 4.
- a plastic body 43 shown in dashed lines as an insulator is shown in FIG. 2, which fills the already mentioned gap in the opening 4.
- the plastic body 43 thus forms an insulating body which is designed to electrically isolate the inner conductors from one another.
- FIG. 3 shows a variant of the common mode choke 1 already shown in FIG. 1. Elements shown in FIG. 3 with the same reference numerals as in FIG. 1 have the same properties as the elements in FIG.
- the common mode choke 45 shown in FIG. 3 comprises a circuit carrier 44 which has an electrically insulating ceramic layer 19, an electrically conductive rear side layer 20 and electrically conductive layers 24 and 26.
- the outer conductor 8 is soldered to the electrically conductive layer 24 with its solder foot 13 by means of a solder 22.
- the inner conductor 3 is soldered with its end face 41 to the electrically conductive layer 26 by means of the solder 22.
- the common mode choke 45 also comprises a connecting element 25 which - unlike the connecting element 18 shown in FIG. 1 - with an end section on an edge area of the electrically conductive layer 24 and an end section opposite thereto with an edge area of the electrically conductive layer 26 by means of the solder 22 is soldered.
- the connecting element 25 thus forms a type of bridge which is supported with its ends on the electrically conductive layers 24 and 26.
- the cavity 21, and thus an air gap, which extends between the connecting element 25 and the circuit carrier 44, can thus reduce a parasitic capacitance which extends between the connecting element 25 and the rear-side layer 20 can train.
- the connecting element 25 is arranged in the area of the toroidal core 5, and thus forms an electrical connecting member which connects one coil turn of the coil with a further coil turn of the same coil.
- FIG. 4 shows an exemplary embodiment for a common mode choke with a rectangular, in particular square, toroidal core 31.
- the toroidal core 31 has an opening 32 with a square section, in which each cuboidal inner conductor is arranged.
- Two each cuboid inner conductors 35 and 36 are each part of a first one
- the opposite current directions in the inner conductors of the different coils are marked in Figure 4 by crosses and dots. High-frequency electromagnetic interference can thus cancel each other out in the toroidal core 31 via a magnetic field induced in the toroidal core 31.
- the inner conductors 34, 33, 35 and 36 each have a square cross-section and together fill the opening 32 of the toroidal core 31 - with the exception of an insulation distance between the inner conductors and the toroidal core - completely.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019215525.1A DE102019215525A1 (de) | 2019-10-10 | 2019-10-10 | Gleichtaktdrossel |
| PCT/EP2020/077283 WO2021069268A1 (de) | 2019-10-10 | 2020-09-30 | Gleichtaktdrossel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4042456A1 true EP4042456A1 (de) | 2022-08-17 |
| EP4042456B1 EP4042456B1 (de) | 2024-09-04 |
Family
ID=72717864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20785721.0A Active EP4042456B1 (de) | 2019-10-10 | 2020-09-30 | Gleichtaktdrossel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4042456B1 (de) |
| DE (1) | DE102019215525A1 (de) |
| WO (1) | WO2021069268A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12094639B2 (en) | 2020-05-14 | 2024-09-17 | Tdk Corporation | Coil device |
| JP7538622B2 (ja) | 2020-05-14 | 2024-08-22 | Tdk株式会社 | コイル装置 |
| CN114141499B (zh) * | 2020-08-17 | 2025-05-16 | Tdk株式会社 | 线圈装置 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4221769C1 (de) * | 1992-07-02 | 1994-01-27 | Abb Patent Gmbh | Verfahren zur Herstellung eines induktiven Bauelements |
| US20040130428A1 (en) * | 2002-10-31 | 2004-07-08 | Peter Mignano | Surface mount magnetic core winding structure |
| US7961071B2 (en) * | 2008-10-20 | 2011-06-14 | Eaton Corporation | Multiphase inductor and filter assemblies using bundled bus bars with magnetic core material rings |
| GB2538459B (en) * | 2014-03-04 | 2020-09-23 | Murata Manufacturing Co | Coil component, coil module, and method for manufacturing coil component |
| DE102016223195A1 (de) * | 2016-11-23 | 2018-05-24 | Robert Bosch Gmbh | Transformatorvorrichtung, Transformator und Verfahren zur Herstellung einer Transformatorvorrichtung |
| EP3483905B1 (de) * | 2017-11-10 | 2020-07-15 | ABB Schweiz AG | Drossel |
| DE112018006472T5 (de) * | 2017-12-22 | 2020-09-03 | Tritium Pty Ltd | Eine spulenanordnung zur verwendung in einer gleichtaktdrossel |
-
2019
- 2019-10-10 DE DE102019215525.1A patent/DE102019215525A1/de active Pending
-
2020
- 2020-09-30 WO PCT/EP2020/077283 patent/WO2021069268A1/de not_active Ceased
- 2020-09-30 EP EP20785721.0A patent/EP4042456B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019215525A1 (de) | 2021-04-15 |
| EP4042456B1 (de) | 2024-09-04 |
| WO2021069268A1 (de) | 2021-04-15 |
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