EP3818548A1 - Composant formant au moins une inductance pour circuit electrique - Google Patents
Composant formant au moins une inductance pour circuit electriqueInfo
- Publication number
- EP3818548A1 EP3818548A1 EP19759014.4A EP19759014A EP3818548A1 EP 3818548 A1 EP3818548 A1 EP 3818548A1 EP 19759014 A EP19759014 A EP 19759014A EP 3818548 A1 EP3818548 A1 EP 3818548A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrically conductive
- circuit board
- printed circuit
- bus bar
- conductive track
- 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
Links
Classifications
-
- 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
- H01F27/2804—Printed windings
-
- 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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- 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
- H01F27/2804—Printed windings
- H01F2027/2814—Printed windings with only part of the coil or of the winding in the printed circuit board, e.g. the remaining coil or winding sections can be made of wires or sheets
-
- 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
- H01F27/2804—Printed windings
- H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
Definitions
- Component forming at least one inductance for an electrical circuit
- the present invention relates to a component forming at least one inductance for an electrical circuit.
- This inductance is for example a coil or all or part of a transformer.
- the electrical circuit is for example an on-board network of a motor vehicle, for example a 12 V network, a 48 V network, or even an on-board network with different voltages, for example a 12 V voltage part and a part of voltage 48 V.
- the electrical circuit can still have a higher voltage, for example when it is used in a vehicle with purely electric propulsion.
- transformers whose primary is formed by the electrically conductive tracks of a printed circuit and whose secondary is formed by a bus bar, these electrically conductive tracks and this bus bar not being electrically connected to each other.
- the present invention aims to remedy all or part of the aforementioned drawbacks and it achieves this, according to one of its aspects, using a component forming at least one inductance for an electrical circuit, the component comprising:
- the bus bar and the electrically conductive track of the printed circuit board portion being arranged relative to one another so as to form an electrically conductive element cooperating with the structure made of magnetically conductive material to form the inductance.
- the bus bar and the electrically conductive track of the portion of the printed circuit board can be electrically connected to each other, for example via one or more fixings by soldering. This electrical connection can thus be qualified as direct, in particular not involving an intermediate magnetic circuit.
- the combination of the bus bar and the electrically conductive track of the printed circuit board portion makes it possible to benefit from an electrically conductive element having the advantages provided by the bus bar in terms of continuously reduced losses and the advantages provided. by the electrically conductive track of the portion of the printed circuit board in terms of reduced losses at high frequencies.
- the presence of the bus bar, and in particular its attachment to the electrically conductive track of the printed circuit board portion, can make it possible to improve the thermal conductivity in the electrically conductive track, thus making it possible to avoid the excessive temperatures appear in the portion of the printed circuit board. This improves the robustness and efficiency of the printed circuit board portion.
- the bus bar and the electrically conductive track can be arranged in parallel, electrically speaking. Such a parallel mounting can make it possible to reduce the current density in the electrically conductive track or tracks of the portion of the printed circuit board.
- the bus bar and the electrically conductive track can be superimposed in a direction perpendicular to the extension plane of the printed circuit board portion.
- the electrically conductive track and the bus bar can be arranged one above the other, having in particular the same shape.
- the bus bar is for example fixed, in particular brazed, to the electrically conductive track of the printed circuit board portion.
- the printed circuit board portion comprises for example several electrically conductive tracks superimposed in a direction perpendicular to the extension plane of this printed circuit board portion, and the bus bar is superimposed with these electrically conductive tracks in said direction.
- the printed circuit board portion includes for example:
- a second electrically conductive track defining a part of a second external surface of the portion of the printed circuit board, the first and the second surface being opposite, and
- the bus bar is for example fixed on the second surface of the printed circuit board portion and in particular has several points of electrical contact with the second electrically conductive track.
- the bus bar can thus be mounted in parallel with all the electrically conductive tracks of the printed circuit board portion, of the electrical connections. additional existing between the second electrically conductive track and this bus bar due to the aforementioned electrical contact points.
- third electrically conductive tracks may be present, for example two, three, four or more.
- the circuit board portion includes six tracks
- electrically conductive stacked namely a first track, a second track and four third tracks.
- the structure of magnetically conductive material may comprise: a base, a cover, and a junction wall between the base and the cover, the base being disposed on a first side of the portion of the printed circuit board and the cover being disposed of a second side of the printed circuit board portion.
- the structure of magnetically conductive material forms for example a housing. Openings can be made in the portion of the printed circuit board to allow the passage of elements of the junction wall of the structure made of magnetically conductive material.
- the first side of the printed circuit board portion is bounded by the first surface thereof while the second side of the printed circuit board portion is bounded by the second surface thereof.
- the component may comprise a single structure made of magnetically conductive material with which the electrically conductive element cooperates to form the inductor (s).
- the component may include a plurality of structures of material
- each of these structures cooperating with the electrically conductive element so as to form, for each cooperation, one or more inductors.
- Each of these structures made of magnetically conductive material is for example carried by the portion of the printed circuit board.
- the component may comprise one or more capacitors, the latter being in particular carried by the portion of the printed circuit board.
- a capacitor is by example associated with an inductor so as to form an LC filter for electromagnetic interference.
- the bus bar and the electrically conductive track can each define several successive turns around an axis perpendicular to the extension plane of the printed circuit board portion.
- the structure of magnetically conductive material comprises a junction wall between the base and the cover, the base being disposed on a first side of the printed circuit board portion and the cover being disposed on a second side of the portion of printed circuit board
- the junction wall can comprise at least one leg extending without discontinuity between the base and the cover, and the bus bar and the electrically conductive track can each define several successive turns around this leg. For example, one or more current smoothing coils are thus formed.
- the junction wall may also include at least one other leg, or even two other legs extending between the base and the cover so as to define at least one air gap.
- the cooperation between the structure of magnetically conductive material and the electrically conductive element defines two inductors, two other legs can be provided, the leg extending without discontinuity being disposed between these two other legs. Still in this case:
- a first magnetic flux associated with a first inductance defined by the component can circulate between the base and the cover of the structure: through the leg without discontinuity and through one of the other legs which is dedicated to this first inductance, and
- a second magnetic flux associated with a second inductance defined by the component can circulate between the base and the cover of the structure: through the leg without discontinuity and through another of the other legs, which is dedicated to this second inductance.
- junction wall includes one or more legs, this or these legs can be made in a single piece with the base, the cover then having a plate shape without a leg.
- the -bus bar can have a ribbon shape.
- the bus bar is for example flattened, that is to say that it has in the plane of extension of the printed circuit board a width much greater than the dimension of this bus bar perpendicular to this plane of extension, for example having a width at least three or four times greater than this dimension perpendicular to this extension plane.
- the inductance can form a smoothing coil, an EMC filter coil or a differential filter coil, or a coupled inductor coil, or even all or part of a transformer.
- certain electrically conductive tracks of the printed circuit board portion and the bus bar form the secondary, respectively primary, of the transformer while other electrically conductive tracks of this same printed circuit board portion, stacked with the aforementioned tracks form the primary, respectively secondary, of this transformer.
- the electrically conductive tracks of the portion of the printed circuit board and the bus bar form only part of the transformer, for example only the primary or secondary of this transformer.
- one end of the bus bar can be connected to the corresponding end of the electrically conductive track, these ends connected to each other then being connected to a shunt for measuring the current, this shunt being in particular carried by the portion of printed circuit board.
- the shunt can form an electrical connection to another component of the electrical circuit, for example controllable electronic switches, such as field effect or bipolar transistors. This or these other electronic components may or may not be carried by the printed circuit board, not necessarily by said portion thereof.
- the shunt forming this connection can span the electrically conductive track of the printed circuit board portion, this electrically conductive track spanned being for example the first electrically conductive track or the second electrically conductive track when the printed circuit board portion comprises several tracks
- the shunt can be mounted on the first surface of the printed circuit board portion while the bus bar, and the capacitor (s), if any, are mounted on the second surface of this portion of the printed circuit board.
- bus bars can be fixed on the printed circuit board portion, so that the electrically conductive element according to the invention can be formed by several electrically conductive tracks of the printed circuit board portion and by several bus bars .
- the component may comprise only a single portion of printed circuit board, and not several portions of printed circuit board, for example offset from one another.
- the component comprises, for example successively, in a direction perpendicular to the plane of extension of the portion of printed circuit board: the base of the structure of magnetically conductive material, the portion of printed circuit board, the bus bar and the cover of the structure of magnetically conductive material.
- the component is for example devoid of any other bus bar and / or of any other portion of printed circuit board.
- a DC / DC voltage converter in particular DC / DC voltage converter 12 V / 48 V, comprising a component as defined above.
- the invention can, more generally, be applied to any static converter, thus including DC / AC converters, also called “inverters / rectifiers”.
- the invention can also be applied to a charging circuit inductor of an electric energy storage unit of a hybrid or purely electric propulsion vehicle.
- This electrical energy storage unit has for example a nominal voltage of 48 V or more.
- Another subject of the invention is a method for producing at least one inductor, comprising the steps consisting in:
- the busbar is fixed to the portion of the printed circuit board, for example by soldering, in particular in a reflow oven.
- the bus bar is for example brazed on the electrically conductive track of the printed circuit board portion.
- the bus bar is for example brazed on one of the electrically conductive tracks present on an end surface of this portion of the printed circuit board, namely the first electrically conductive track or the aforementioned second electrically conductive track.
- solder paste then being interposed between this first surface and this or these components, - place the assembly obtained in a polymerization oven in the absence of solder paste, or in a reflow oven when solder paste is also present,
- solder paste is for example deposited by screen printing.
- FIG. 1 is an exploded view of a component according to a first example of implementation of the invention
- Figure 2 shows the component of Figure 1 in the assembled state
- FIG. 3 shows a component according to a second example of implementation of the invention.
- FIG. 1 shows an exploded view of a component 1 according to a first example of implementation of the invention.
- This component 1 here forms a single inductor for an electric circuit of a motor vehicle.
- This electrical circuit is for example the on-board network of this vehicle.
- the electrical circuit has on the one hand a 12 V part, on the other hand a 48 V part, and a DC / DC voltage converter 12 V / 48 V to connect these two circuit parts.
- the inductance obtained can be a current smoothing coil, an EMC filtering coil, a differential filtering coil, or all or part of a transformer, as will be seen below.
- the component 1 comprises a portion of printed circuit board 2, which here comprises several electrically conductive tracks 3.
- Each of these tracks 3 is here made of copper.
- the electrically conductive tracks 3 are stacked together according to the thickness of the portion 2 of the printed circuit board.
- a first electrically conductive track 3 defines a part of a first external surface 2a of the portion 2 of printed circuit board
- a second electrically conductive track 3 defines a part of a second external surface 2b of the portion 2 of printed circuit, the first and second surfaces being opposite.
- Several third tracks electrically conductive 3 are arranged inside the portion 2 of the printed circuit board.
- Component 1 also comprises a structure 4 made of a magnetically conductive material, and a bus bar 6.
- the structure 4 made of magnetically conductive material comprises: a base 7, a cover 8 and a junction wall 10 between the base 7 and the cover 8.
- the base 7 is arranged on a first side of the portion of printed circuit board 2
- the cover 8 is disposed on a second side of this portion of printed circuit board 2.
- the junction wall 10 extends through openings 9 in the portion 2 of the printed circuit board.
- the junction wall 10 here comprises three legs: an internal leg 11 with air gap and two external legs 12 without air gap which frame this internal leg 11. It can be seen that each electrically conductive track 3 is wound around the internal leg 11, making nearly two turns around this internal leg 11 between two current ends respectively referenced by 13 and 14. This winding takes place around an axis perpendicular to the plane of extension of the portion 2 of the printed circuit board.
- the structure 4 is here cut in half, so that we observe before assembly:
- a first part of the structure which comprises the base 7 and which is disposed on the first side of the portion of the printed circuit board, and
- a second part of the structure which includes the cover 8 and which is arranged on the second side of the printed circuit board portion.
- the bus bar 6 is in the example considered made of copper and it also defines two turns around the inner leg 11 around the same axis as the electrically conductive track.
- the bus bar 6 extends between two ends respectively referenced by 16 and 17.
- the bus bar may have one or more retaining tabs 18, the presence of these retaining tabs 18 being purely optional.
- a shunt 30 is carried by the portion 2 of the printed circuit board, this shunt 30 being mounted on the first surface 2a of the portion 2 of the printed circuit board while the bus bar 6 is mounted on the second surface 2b of this portion 2 of the printed circuit board.
- the end 17 of the bus bar 6 and each end 14 of a track is carried by the portion 2 of the printed circuit board, this shunt 30 being mounted on the first surface 2a of the portion 2 of the printed circuit board while the bus bar 6 is mounted on the second surface 2b of this portion 2 of the printed circuit board.
- electrically conductive 3 are connected together and this common end is connected to the shunt 30 to allow electrical connection to other components carried by the printed circuit board.
- the shunt 30 spans, for example, the first electrically conductive track 3 of the printed circuit board portion. It can be seen in FIG. 1 that the electrically conductive tracks 3 and the bus bar 6 are superimposed, having the same shape.
- the end 16 of this bus bar is electrically connected to each end 13 of the electrically conductive tracks 3 and the end 17 of this bus bar is electrically connected to each end 14 of these electrically conductive tracks.
- These electrically conductive tracks 3 and the bus bar 6 are thus mounted in parallel in the example considered. As will be seen below, the situation is special between the bus bar 6 and the second electrically conductive track, the latter still having several intermediate electrical connections between them, between their ends.
- the bus bar 6 is positioned with respect to the electrically conductive tracks 3 so that the electrically conductive tracks 3 and the bus bar 6 together define an electrically conductive element whose cooperation with the structure 4 here defines an inductance.
- the busbar 6 is in the example considered fixed by soldering on the second surface 2b of the portion 2 of the printed circuit board 2, as will now be described. This bus bar 6 then has several points of electrical contact with the second electrically conductive track 3 opposite which it is located, thus defining additional electrical connections with this track.
- the first part of the structure 4 is made of magnetically conductive material on the first surface 2a of the printed circuit board portion, glue 21 in the form of strips being here interposed between this first surface 2a and this first part from structure 4,
- the shunt 30 is placed on this first surface 2a, solder paste then being interposed between this first surface 2a and this shunt 30,
- the portion 2 of the printed circuit board is turned over and the second part of the structure 4 made of magnetically conductive material is placed on the second surface 2b of the portion 2 of the printed circuit board, strips of glue 21 being interposed between this second surface and this second part of the structure,
- the bus bar 6 is placed on this second surface 2b of the portion 2 of the circuit board, the solder paste then being interposed in the form of studs 20 between this second surface 2b and the bus bar 6, and
- the solder paste can be deposited by screen printing.
- the adhesive can be polymerized in the oven or during a preliminary treatment.
- the component according to FIG. 2 is thus obtained.
- This component 1 forms, for example, a current smoothing coil which can be used in the above-mentioned electrical circuit.
- the component 1 comprises two structures 4 made of magnetically conductive material.
- Each of these structures 4 is assembled on the portion 2 of the printed circuit board, each of these structures may or may not extend on either side of this portion 2 of the printed circuit board.
- the bus bar 6 is fixed to the portion 2 of the printed circuit board and it is arranged relative to the electrically conductive tracks of this portion of the board which are not visible in this figure 3, so as to form an electrically conductive element.
- This electrically conductive element cooperates with each structure 4 so as to form, for each cooperation, an inductance which is here an EMC filter coil.
- EMC filter coils are connected in series and the portion of printed circuit board 2 carries two capacitors 25. Each of these capacitors 25 is associated with one of the filter coils so as to form with this coil an LC filter.
- the invention can for example be used to make all or part of a transformer.
- a high current secondary winding of a transformer is produced with the combination of a bus bar and one or more electrically conductive tracks of a portion of a printed circuit according to the invention, while the lower current primary winding of this transformer is produced using other electrically conductive tracks, the latter belonging or not belonging to this same portion of printed circuit board and this primary winding being produced without adding a bus bar .
- busbars 6 can be fixed on the portion 2 of the printed circuit board, these busbars 6 being stacked on top of each other with each time interposition of an electrical insulator.
- the electrically conductive element is then formed by: the electrically conductive tracks of the portion 2 of the printed circuit board, and the stacked bus bars 6.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1856077A FR3083364B1 (fr) | 2018-07-02 | 2018-07-02 | Composant formant au moins une inductance pour circuit electrique |
| PCT/FR2019/051639 WO2020008140A1 (fr) | 2018-07-02 | 2019-07-02 | Composant formant au moins une inductance pour circuit electrique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3818548A1 true EP3818548A1 (fr) | 2021-05-12 |
Family
ID=65200894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19759014.4A Pending EP3818548A1 (fr) | 2018-07-02 | 2019-07-02 | Composant formant au moins une inductance pour circuit electrique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3818548A1 (fr) |
| CN (1) | CN112352297A (fr) |
| FR (1) | FR3083364B1 (fr) |
| WO (1) | WO2020008140A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020214311A1 (de) * | 2020-11-13 | 2022-05-19 | Zf Friedrichshafen Ag | Leiterplattenanordnung, Inverter sowie Kraftfahrzeug |
| CN116453832B (zh) * | 2023-03-31 | 2025-11-28 | 泉州市三安集成电路有限公司 | 一种空气桥电感结构及制作方法和应用 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225971A (en) * | 1992-01-08 | 1993-07-06 | International Business Machines Corporation | Three coil bridge transformer |
| US7352269B2 (en) * | 2002-12-13 | 2008-04-01 | Volterra Semiconductor Corporation | Method for making magnetic components with N-phase coupling, and related inductor structures |
| US8299885B2 (en) * | 2002-12-13 | 2012-10-30 | Volterra Semiconductor Corporation | Method for making magnetic components with M-phase coupling, and related inductor structures |
| JP4059396B2 (ja) * | 2003-03-31 | 2008-03-12 | Tdk株式会社 | 薄型大電流トランス |
| US7123123B2 (en) * | 2005-01-12 | 2006-10-17 | Vanner, Inc. | High-frequency power transformer |
| CN100536294C (zh) * | 2005-01-21 | 2009-09-02 | 株式会社日立制作所 | 电源装置、使用该电源装置的电源系统及电子装置 |
| JP2007336761A (ja) * | 2006-06-19 | 2007-12-27 | Hitachi Ltd | 電力変換装置 |
| KR101365393B1 (ko) * | 2013-03-13 | 2014-02-20 | 엘에스산전 주식회사 | 전기 자동차용 변압기 모듈 |
| US9696349B2 (en) * | 2014-06-26 | 2017-07-04 | General Electric Company | Current sensing system |
| WO2016028451A1 (fr) * | 2014-08-20 | 2016-02-25 | Halliburton Energy Services, Inc. | Ensembles à carte de circuit imprimé |
| DE102016219790A1 (de) * | 2016-10-12 | 2018-04-12 | Siemens Aktiengesellschaft | Verfahren zur Herstellung eines Leiterplattenstromwandlers |
| JP2018074128A (ja) * | 2016-11-04 | 2018-05-10 | 住友電気工業株式会社 | コイル構造体 |
-
2018
- 2018-07-02 FR FR1856077A patent/FR3083364B1/fr active Active
-
2019
- 2019-07-02 WO PCT/FR2019/051639 patent/WO2020008140A1/fr not_active Ceased
- 2019-07-02 EP EP19759014.4A patent/EP3818548A1/fr active Pending
- 2019-07-02 CN CN201980044408.XA patent/CN112352297A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3083364A1 (fr) | 2020-01-03 |
| WO2020008140A1 (fr) | 2020-01-09 |
| CN112352297A (zh) | 2021-02-09 |
| FR3083364B1 (fr) | 2025-01-10 |
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Owner name: VALEO ELECTRIFICATION |