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EP3818548A1 - Component forming at least one inductor for an electrical circuit - Google Patents

Component forming at least one inductor for an electrical circuit

Info

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
Application number
EP19759014.4A
Other languages
German (de)
French (fr)
Inventor
Nicolas ALLALI
Emmanuel Talon
Philippe Mercier
Pierre Smal
Paul Doublet
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.)
Valeo Electrification
Original Assignee
Valeo Systemes de Controle Moteur SAS
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 Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP3818548A1 publication Critical patent/EP3818548A1/en
Pending legal-status Critical Current

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

Component (1) forming at least one inductor, the component comprising: - a structure (4) made of a magnetically conductive material; - a portion (2) of printed circuit board assembled together with the structure (4) and containing at least one electrically conductive track (3); and - at least one busbar (6) that is attached to the portion (2) of printed circuit board, the busbar (6) and the electrically conductive track (3) of the portion (2) of printed circuit board being arranged in relation to one another so as to form an electrically conductive element that cooperates with the structure (4) made of magnetically conductive material in order to form the inductor.

Description

Composant formant au moins une inductance pour circuit électrique  Component forming at least one inductance for an electrical circuit

La présente invention concerne un composant formant au moins une inductance pour circuit électrique. Cette inductance est par exemple une bobine ou tout ou partie d’un transformateur. 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.

Le circuit électrique est par exemple un réseau de bord d’un véhicule automobile, par exemple un réseau 12 V, un réseau 48 V, ou encore un réseau de bord avec différentes tensions, par exemple une partie de tension 12 V et une partie de tension 48 V. Le circuit électrique peut encore avoir une tension plus élevée, par exemple lorsqu’il est utilisé au sein d’un véhicule à propulsion purement électrique. 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.

Il est connu de réaliser une bobine de lissage en faisant coopérer une ou plusieurs pistes électriquement conductrices d’une carte de circuit imprimé et une structure en un matériau magnétiquement conducteur. Ces pistes électriquement conductrices sont adaptées pour éviter les pertes aux hautes fréquences mais sont susceptibles de causer des pertes en continu.  It is known to produce a smoothing coil by making one or more electrically conductive tracks of a printed circuit board cooperate and a structure made of a magnetically conductive material. These electrically conductive tracks are adapted to avoid losses at high frequencies but are liable to cause continuous losses.

Il est par ailleurs connu de disposer dans une structure en un matériau magnétiquement conducteur une barre-bus en cuivre pour réaliser une bobine de lissage. La présence d’une telle barre-bus est susceptible de causer des pertes aux hautes fréquences mais est adaptée pour éviter les pertes en continu.  It is also known to have a copper bus bar in a structure made of a magnetically conductive material to produce a smoothing coil. The presence of such a bus bar is likely to cause losses at high frequencies but is adapted to avoid continuous losses.

On connaît par ailleurs des demandes DE 10 2016 219 790 et JP 2004-303857 des  We also know of applications DE 10 2016 219 790 and JP 2004-303857 of

transformateurs dont le primaire est formé par les pistes électriquement conductrices d’un circuit imprimé et dont le secondaire est formé par une barre-bus, ces pistes électriquement conductrices et cette barre-bus n’étant pas électriquement connectées entre elles. 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.

La présente invention vise à remédier à tout ou partie des inconvénients précités et elle y parvient, selon l’un de ses aspects, à l’aide d’un composant formant au moins une inductance pour circuit électrique, le composant comprenant :  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:

- au moins une structure en un matériau magnétiquement conducteur,  - at least one structure made of a magnetically conductive material,

- une portion de carte de circuit imprimé assemblée avec la structure et contenant au moins une piste électriquement conductrice, et  a portion of the printed circuit board assembled with the structure and containing at least one electrically conductive track, and

- au moins une barre -bus fixée sur la portion de carte de circuit imprimé,  - at least one bus bar fixed to the portion of the printed circuit board,

la barre -bus et la piste électriquement conductrice de la portion de carte de circuit imprimé étant disposées l’une par rapport à l’autre de manière à former un élément électriquement conducteur coopérant avec la structure en matériau magnétiquement conducteur pour former l’inductance.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.

La barre -bus et la piste électriquement conductrice de la portion de carte de circuit imprimé peuvent être connectées électriquement l’une à l’autre, par exemple via une ou plusieurs fixations par brasure. Cette connexion électrique peut ainsi être qualifiée de directe, n’impliquant notamment pas un circuit magnétique intermédiaire. La combinaison de la barre -bus et de la piste électriquement conductrice de la portion de carte de circuit imprimé permet de bénéficier d’un élément électriquement conducteur présentant les avantages fournis par la barre -bus en termes de pertes réduites en continu et les avantages fournis par la piste électriquement conductrice de la portion de carte de circuit imprimé en termes de pertes réduites aux hautes fréquences. 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.

Par ailleurs, la présence de la barre -bus, et notamment sa fixation sur la piste électriquement conductrice de la portion de carte de circuit imprimé, peut permettre d’améliorer la conductivité thermique dans la piste électriquement conductrice, permettant ainsi d’éviter l’apparition de températures excessives dans la portion de carte de circuit imprimé. On améliore ainsi la robustesse et l’efficacité de la portion de carte de circuit imprimé.  Furthermore, 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.

La barre-bus et la piste électriquement conductrice peuvent être disposées en parallèle, électriquement parlant. Un tel montage en parallèle peut permettre de diminuer la densité de courant dans la ou les pistes électriquement conductrices de la portion de carte de circuit imprimé. 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.

La barre -bus et la piste électriquement conductrice peuvent être superposées selon une direction perpendiculaire au plan d’extension de la portion de carte de circuit imprimé. Autrement dit, la piste électriquement conductrice et la barre -bus peuvent être disposées l’une au-dessus de l’autre, ayant notamment la même forme. 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. In other words, the electrically conductive track and the bus bar can be arranged one above the other, having in particular the same shape.

La barre-bus est par exemple fixée, notamment brasée, sur la piste électriquement conductrice de la portion de carte de circuit imprimé.  The bus bar is for example fixed, in particular brazed, to the electrically conductive track of the printed circuit board portion.

La portion de carte de circuit imprimé comprend par exemple plusieurs pistes électriquement conductrices superposées selon une direction perpendiculaire au plan d’extension de cette portion de carte de circuit imprimé, et la barre -bus est superposée avec ces pistes électriquement conductrices selon ladite direction.  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.

La portion de carte de circuit imprimé comprend par exemple :  The printed circuit board portion includes for example:

- une première piste électriquement conductrice définissant une partie d’une première surface extérieure de la portion de carte de circuit imprimé,  - a first electrically conductive track defining a part of a first external surface of the portion of the printed circuit board,

- une deuxième piste électriquement conductrice définissant une partie d’une deuxième surface extérieure de la portion de carte de circuit imprimé, la première et la deuxième surface étant opposées, et  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

- au moins une troisième piste électriquement conductrice, disposée à l’intérieur de la portion de carte de circuit imprimé.  - at least a third electrically conductive track, arranged inside the portion of the printed circuit board.

La barre -bus est par exemple fixée sur la deuxième surface de la portion de carte de circuit imprimé et possède notamment plusieurs points de contact électrique avec la deuxième piste électriquement conductrice. La barre-bus peut ainsi être montée en parallèle avec toutes les pistes électriquement conductrices de la portion de carte de circuit imprimé, des connexions électriques additionnelles existant entre la deuxième piste électriquement conductrice et cette barre-bus du fait des points de contact électrique précités. 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.

Plusieurs troisièmes pistes électriquement conductrices peuvent être présentes, par exemple deux, trois, quatre ou plus.  Several third electrically conductive tracks may be present, for example two, three, four or more.

Dans un exemple précis, la portion de carte de circuit imprimé comprend six pistes  In a specific example, the circuit board portion includes six tracks

électriquement conductrices empilées, à savoir une première piste, une deuxième piste et quatre troisièmes pistes. electrically conductive stacked, namely a first track, a second track and four third tracks.

La structure en matériau magnétiquement conducteur peut comprendre : une base, un couvercle, et une paroi de jonction entre la base et le couvercle, la base étant disposée d’un premier côté de la portion de carte de circuit imprimé et le couvercle étant disposé d’un deuxième côté de la portion de carte de circuit imprimé. La structure en matériau magnétiquement conducteur forme par exemple un boîtier. Des ouvertures peuvent être ménagées dans la portion de carte de circuit imprimé pour permettre le passage d’éléments de la paroi de jonction de la stmcture en matériau magnétiquement conducteur.  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.

Le premier côté de la portion de carte de circuit imprimé est délimité par la première surface de celle-ci tandis que le deuxième côté de la portion de carte de circuit imprimé est délimité par la deuxième surface de celle-ci.  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.

Plusieurs inductances sont par exemple formées par la coopération entre l’élément  Several inductors are for example formed by the cooperation between the element

électriquement conducteur et la stmcture en matériau magnétiquement conducteur. Ces différentes inductances sont par exemple réalisées selon l’enseignement de la demande de brevet déposé par la Demanderesse en France le 8 juin 2018 sous le numéro de dépôt 18 54988. Le contenu de cette demande de brevet français est incorporé par référence à la présente demande, notamment en ce qu’il enseigne de faire circuler le flux magnétique associé à chaque inductance dans une première jambe de la stmcture en matériau magnétiquement conducteur, cette première jambe étant dépourvue d’entrefer, et dans une deuxième jambe de cette stmcture, cette deuxième jambe étant dédiée à cette inductance et impliquant la traversée d’un entrefer. electrically conductive and the structure made of magnetically conductive material. These different inductors are for example produced according to the teaching of the patent application filed by the Applicant in France on June 8, 2018 under the filing number 18 54988. The content of this French patent application is incorporated by reference into the present application , in particular in that it teaches to circulate the magnetic flux associated with each inductor in a first leg of the structure made of magnetically conductive material, this first leg being devoid of air gap, and in a second leg of this structure, this second leg being dedicated to this inductance and involving the crossing of an air gap.

Le composant peut comprendre une seule stmcture en matériau magnétiquement conducteur avec laquelle l’élément électriquement conducteur coopère pour former la ou les inductances. The component may comprise a single structure made of magnetically conductive material with which the electrically conductive element cooperates to form the inductor (s).

En variante, le composant peut comprendre une pluralité de stmctures en matériau Alternatively, the component may include a plurality of structures of material

magnétiquement conducteur, distinctes les unes les autres, chacune de ces stmctures coopérant avec l’élément électriquement conducteur de manière à former, pour chaque coopération, une ou plusieurs inductances. Chacune de ces stmctures en matériau magnétiquement conducteur est par exemple portée par la portion de carte de circuit imprimé. magnetically conductive, distinct from each other, 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.

Le cas échéant, le composant peut comprendre un ou plusieurs condensateurs, ces derniers étant notamment portés par la portion de carte de circuit imprimé. Un condensateur est par exemple associé à une inductance de manière à former un filtre LC pour les interférences électromagnétiques. Where appropriate, 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.

Dans tout ce qui précède, la barre -bus et la piste électriquement conductrice peuvent chacune définir plusieurs tours successifs autour d’un axe perpendiculaire au plan d’extension de la portion de carte de circuit imprimé.  In all of the above, 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.

Lorsque la structure en matériau magnétiquement conducteur comprend une paroi de jonction entre la base et le couvercle, la base étant disposée d’un premier côté de la portion de carte de circuit imprimé et le couvercle étant disposé d’un deuxième côté de la portion de carte de circuit imprimé, la paroi de jonction peut comprendre au moins une jambe s’étendant sans discontinuité entre la base et le couvercle, et la barre-bus et la piste électriquement conductrice peuvent chacune définir plusieurs tours successifs autour de cette jambe. On forme par exemple ainsi une ou plusieurs bobines de lissage de courant.  When 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.

Dans ce cas, la paroi de jonction peut encore comprendre au moins une autre jambe, voire deux autres jambes s’étendant entre la base et le couvercle de manière à définir au moins un entrefer. Lorsque la coopération entre la structure en matériau magnétiquement conducteur et l’élément électriquement conducteur définit deux inductances, deux autres jambes peuvent être prévues, la jambe s’étendant sans discontinuité étant disposée entre ces deux autres jambes. Toujours dans ce cas :  In this case, 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. When 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:

- un premier flux magnétique associé à une première inductance définie par le composant peut circuler entre la base et le couvercle de la structure : à travers la jambe sans discontinuité et à travers une des autres jambes qui est dédiée à cette première inductance, et  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

- un deuxième flux magnétique associé à une deuxième inductance définie par le composant peut circuler entre la base et le couvercle de la structure : à travers la jambe sans discontinuité et à travers une autre des autres jambes, qui est dédiée à cette deuxième inductance.  - 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.

Que la paroi de jonction comprenne une ou plusieurs jambes, cette ou ces jambes peuvent être réalisées d’une seule pièce avec la base, le couvercle ayant alors une forme de plaque dépourvue de jambe.  Whether the 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.

Dans tout ce qui précède, la barre -bus peut avoir une forme de ruban. La barre -bus est par exemple aplatie, c’est-à-dire qu’elle présente dans le plan d’extension de la carte de circuit imprimé une largeur bien supérieure à la dimension de cette barre-bus perpendiculairement à ce plan d’extension, présentant par exemple une largeur au moins trois ou quatre fois supérieure à cette dimension perpendiculairement à ce plan d’extension.  In all of the above, 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.

L’inductance peut former une bobine de lissage, une bobine de filtrage CEM ou une bobine de filtrage différentiel, ou une bobine d’inductance couplée, ou encore tout ou partie d’un transformateur. Dans un exemple, certaines pistes électriquement conductrices de la portion de carte de circuit imprimé et la barre -bus forment le secondaire, respectivement primaire, du transformateur tandis que d’autres pistes électriquement conductrices de cette même portion de carte de circuit imprimé, empilées avec les pistes précitées, forment le primaire, respectivement secondaire, de ce transformateur. 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. In one example, 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.

En variante, les pistes électriquement conductrices de la portion de carte de circuit imprimé et la barre -bus ne forment qu’une partie du transformateur, par exemple que le primaire ou le secondaire de ce transformateur.  Alternatively, 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.

Dans tout ce qui précède, une extrémité de la barre -bus peut être raccordée à l’extrémité correspondante de la piste électriquement conductrice, ces extrémités raccordées entre elles étant alors connectées à un shunt de mesure du courant, ce shunt étant notamment porté par la portion de carte de circuit imprimé. Le shunt peut former une connexion électrique vers un autre composant du circuit électrique, par exemple des interrupteurs électroniques commandables, tels que des transistors à effet de champ ou bipolaire. Ce ou ces autres composants électroniques peuvent ou non être portés par la carte de circuit imprimé, pas nécessairement par ladite portion de celle-ci.  In all of the above, 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.

Le shunt formant cette connexion peut enjamber la piste électriquement conductrice de la portion de carte de circuit imprimé, cette piste électriquement conductrice enjambée étant par exemple la première piste électriquement conductrice ou la deuxième piste électriquement conductrice lorsque la portion de carte de circuit imprimé comprend plusieurs pistes  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

électriquement conductrices. electrically conductive.

Le shunt peut être monté sur la première surface de la portion de carte de circuit imprimé tandis que la barre-bus, et le ou les éventuels condensateurs, sont par exemple montés sur la deuxième surface de cette portion de carte de circuit imprimé.  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.

Plusieurs barre -bus peuvent être fixées sur la portion de carte de circuit imprimé, de sorte que l’élément électriquement conducteur selon l’invention peut être formé par plusieurs pistes électriquement conductrices de la portion de carte de circuit imprimé et par plusieurs barre -bus. Several 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 .

Dans tout ce qui précède, le composant peut ne comprendre qu’une seule portion de carte de circuit imprimé, et non plusieurs portions de carte de circuit imprimé par exemple décalées l’une par rapport à l’autre. In all of the above, 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.

Le composant comprend par exemple successivement, selon une direction perpendiculaire au plan d’extension de la portion de carte de circuit imprimé : la base de la structure en matériau magnétiquement conducteur, la portion de carte de circuit imprimé, la barre bus et le couvercle de la structure en matériau magnétiquement conducteur. Le composant est par exemple dépourvu d’ autre barre bus et/ou d’ autre portion de carte de circuit imprimé. L’invention a encore pour objet, selon un autre de ses aspects, un convertisseur de tension continue/continue, notamment convertisseur de tension continue/continue 12 V/48 V, comprenant un composant tel que défini ci-dessus. 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. Another subject of the invention is, according to another of its aspects, a DC / DC voltage converter, in particular DC / DC voltage converter 12 V / 48 V, comprising a component as defined above.

L’invention peut, plus globalement s’appliquer à tout convertisseur statique, incluant ainsi les convertisseurs continu/alternatif, encore appelés « onduleurs/redresseurs ».  The invention can, more generally, be applied to any static converter, thus including DC / AC converters, also called "inverters / rectifiers".

L’invention peut encore s’appliquer pour une inductance de circuit de charge d’une unité de stockage d’énergie électrique d’un véhicule à propulsion hybride ou purement électrique. Cette unité de stockage d’énergie électrique a par exemple une tension nominale de 48 V ou plus.  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.

L’invention a encore pour objet, selon un autre de ses aspects, un procédé de réalisation d’au moins une inductance, comprenant les étapes consistant à :  Another subject of the invention, according to another of its aspects, is a method for producing at least one inductor, comprising the steps consisting in:

- assembler une structure en matériau magnétiquement conducteur avec une portion de carte de circuit imprimé, cette portion de circuit imprimé comprenant au moins une piste électriquement conductrice,  assembling a structure of magnetically conductive material with a portion of printed circuit board, this portion of printed circuit comprising at least one electrically conductive track,

- fixer sur la portion de carte de circuit imprimé au moins une barre -bus, après avoir disposé cette barre -bus par rapport à la piste électriquement conductrice de manière à former un élément électriquement conducteur coopérant avec la structure en matériau magnétiquement conducteur pour former l’inductance.  - Attach at least one bus bar to the printed circuit board, after having placed the bus bar relative to the electrically conductive track so as to form an electrically conductive element cooperating with the structure made of magnetically conductive material to form the 'inductance.

Tout ou partie des caractéristiques précédentes s’applique encore au procédé qui vient d’être mentionné.  All or part of the above characteristics still apply to the process which has just been mentioned.

Les étapes précitées d’ assemblage et de fixation peuvent se produire successivement ou simultanément. « Simultanément » signifie que la terminaison de l’assemblage s’effectue en même temps que l’étape de fixation.  The aforementioned assembly and fixing steps can occur successively or simultaneously. "Simultaneously" means that the assembly is completed at the same time as the fixing step.

La fixation de la barre-bus sur la portion de carte de circuit imprimé s’effectue par exemple par brasure, notamment dans un four de refusion. La barre -bus est par exemple brasée sur la piste électriquement conductrice de la portion de carte de circuit imprimé. Lorsque la portion de carte de circuit imprimé comprend plusieurs pistes électriquement conductrices, la barre -bus est par exemple brasée sur l’une des pistes électriquement conductrices présentes sur une surface d’extrémité de cette portion de carte de circuit imprimé, à savoir la première piste électriquement conductrice ou la deuxième piste électriquement conductrice précitées.  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. When the portion of the printed circuit board comprises several electrically conductive tracks, 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.

Lors du procédé, on peut :  During the process, you can:

- disposer une première partie de la structure en matériau magnétiquement conducteur sur la première surface de la portion de carte de circuit imprimé, de la colle étant par exemple interposée entre cette première surface et cette première partie de la structure,  - placing a first part of the structure of magnetically conductive material on the first surface of the printed circuit board portion, glue being for example interposed between this first surface and this first part of the structure,

- disposer le cas échéant d’autres composants tels qu’un shunt sur cette première surface, de la pâte à braser étant alors interposée entre cette première surface et ce ou ces composants, - disposer l’ensemble obtenu dans un four de polymérisation en l’absence de pâte à braser, ou dans un four de refusion lorsque de la pâte à braser est également présente, - if necessary have other components such as a shunt on this first surface, 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,

- retourner ensuite la portion de carte de circuit imprimé et disposer la deuxième partie de la stmcture en matériau magnétiquement conducteur sur la deuxième surface de la portion de carte de circuit imprimé, de la colle étant par exemple interposée entre cette deuxième surface et cette deuxième partie de la structure,  - then turn over the printed circuit board portion and place the second part of the structure in magnetically conductive material on the second surface of the printed circuit board portion, glue being for example interposed between this second surface and this second part of the structure,

- disposer la barre-bus sur cette deuxième surface de la portion de carte de circuit imprimé, et le cas échéant un ou plusieurs autres composants, de la pâte à braser étant alors interposée entre cette deuxième surface et la barre -bus, et  placing the busbar on this second surface of the portion of the printed circuit board, and if necessary one or more other components, of the solder paste then being interposed between this second surface and the busbar, and

- disposer l’ensemble obtenu dans un four de refusion.  - place the assembly obtained in a reflow oven.

Dans ce qui précède, la pâte à braser est par exemple déposée par sérigraphie.  In the above, the solder paste is for example deposited by screen printing.

L’invention pourra être mieux comprise à la lecture de la description qui va suivre d’exemples non limitatifs de celle-ci et à l’examen du dessin annexé sur lequel :  The invention will be better understood on reading the description which follows of nonlimiting examples thereof and on examining the appended drawing in which:

- la figure 1 est une vue en éclaté d’un composant selon un premier exemple de mise en œuvre de l’invention,  FIG. 1 is an exploded view of a component according to a first example of implementation of the invention,

- la figure 2 représente le composant de la figure 1 à l’état assemblé, et  - Figure 2 shows the component of Figure 1 in the assembled state, and

- la figure 3 représente un composant selon un deuxième exemple de mise en œuvre de l’invention.  - Figure 3 shows a component according to a second example of implementation of the invention.

On a représenté sur la figure 1 en vue éclatée un composant 1 selon un premier exemple de mise en œuvre de l’invention. Ce composant 1 forme ici une seule inductance pour un circuit électrique de véhicule automobile. Ce circuit électrique est par exemple le réseau de bord de ce véhicule.  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.

Dans l’exemple qui va être décrit, le circuit électrique présente d’une part une partie à 12 V, d’autre part une partie à 48 V, et un convertisseur de tension continu/continu 12 V/48 V pour relier ces deux parties de circuit. L’inductance obtenue peut être une bobine de lissage de courant, une bobine de filtrage CEM, une bobine de filtrage différentiel, ou encore tout ou partie d’un transformateur, comme on le verra par la suite.  In the example which will be described, 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.

Sur la figure 1, on constate que le composant 1 comprend une portion de carte de circuit imprimé 2, qui comprend ici plusieurs pistes électriquement conductrice 3. Chacune de ces pistes 3 est ici en cuivre. Dans l’exemple considéré, les pistes électriquement conductrices 3 sont empilées entre elles selon l’épaisseur de la portion 2 de carte de circuit imprimé.  In FIG. 1, it can be seen that 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. In the example considered, the electrically conductive tracks 3 are stacked together according to the thickness of the portion 2 of the printed circuit board.

Une première piste électriquement conductrice 3 définit une partie d’une première surface extérieure 2a de la portion 2 de carte de circuit imprimé, une deuxième piste électriquement conductrice 3 définit une partie d’une deuxième surface extérieure 2b de la portion 2 de circuit imprimé, la première et la deuxième surface étant opposées. Plusieurs troisièmes pistes électriquement conductrice 3 sont disposées à l’intérieur de la portion 2 de carte de circuit imprimé. 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.

Le composant 1 comprend encore une structure 4 en un matériau magnétiquement conducteur, et une barre -bus 6.  Component 1 also comprises a structure 4 made of a magnetically conductive material, and a bus bar 6.

On constate sur la figure 1 que la structure 4 en matériau magnétiquement conducteur comprend : une base 7, un couvercle 8 et une paroi de jonction 10 entre la base 7 et le couvercle 8. Comme on peut le voir sur la figure 1, la base 7 est disposée d’un premier côté de la portion de carte de circuit imprimé 2, et le couvercle 8 est disposé d’un deuxième côté de cette portion de carte de circuit imprimé 2. La paroi de jonction 10 s’étend à travers des ouvertures 9 ménagées dans la portion 2 de carte de circuit imprimé.  It can be seen in FIG. 1 that 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. As can be seen in FIG. 1, the base 7 is arranged on a first side of the portion of printed circuit board 2, and 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.

La paroi de jonction 10 comprend ici trois jambes : une jambe interne 11 avec entrefer et deux jambes externes 12 sans entrefer qui encadrent cette jambe interne 11. On constate que chaque piste électriquement conductrice 3 est enroulée autour de la jambe interne 11, faisant près de deux tours autour de cette jambe interne 11 entre deux extrémités en courant respectivement référencées par 13 et 14. Cet enroulement se fait autour d’un axe perpendiculaire au plan d’extension de la portion 2 de carte de circuit imprimé.  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.

La structure 4 est ici coupée en deux, de sorte qu’on observe avant assemblage :  The structure 4 is here cut in half, so that we observe before assembly:

- une première partie de la structure qui comprend la base 7 et qui est disposée du premier côté de la portion de carte de circuit imprimé, et  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

- une deuxième partie de la structure qui comprend le couvercle 8 et qui est disposée du deuxième côté de la portion de carte de circuit imprimé.  - 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.

La barre -bus 6 est dans l’exemple considéré réalisée en cuivre et elle définit également deux tours autour de la jambe interne 11 autour du même axe que la piste électriquement conductrice. La barre -bus 6 s’étend entre deux extrémités respectivement référencées par 16 et 17. La barre- bus peut présenter une ou plusieurs pattes de maintien 18, la présence de ces pattes de maintien 18 étant purement optionnelle.  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.

On constate sur la figure 1 qu’un shunt 30 est porté par la portion 2 de carte de circuit imprimé, ce shunt 30 étant monté sur la première surface 2a de la portion 2 de carte de circuit imprimé pendant que la barre -bus 6 est montée sur la deuxième surface 2b de cette portion 2 de carte de circuit imprimé. L’extrémité 17 de la barre -bus 6 et chaque extrémité 14 d’une piste  It can be seen in FIG. 1 that 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

électriquement conductrice 3 sont raccordées entre elles et cette extrémité commune est reliée au shunt 30 pour permettre la connexion électrique à d’autres composants portés par la carte de circuit imprimé. Le shunt 30 enjambe par exemple la première piste électriquement conductrice 3 de la portion de carte de circuit imprimé. On constate sur la figure 1 que les pistes électriquement conductrices 3 et la barre-bus 6 sont superposées, ayant la même forme. L’extrémité 16 de cette barre-bus est électriquement connectée à chaque extrémité 13 des pistes électriquement conductrices 3 et l’extrémité 17 de cette barre -bus est électriquement connectée à chaque extrémité 14 de ces pistes électriquement conductrices. Ces pistes électriquement conductrices 3 et la barre-bus 6 sont ainsi montées en parallèle dans l’exemple considéré. Comme on le verra par la suite, la situation est particulière entre la barre-bus 6 et la deuxième piste électriquement conductrice, ces dernières présentant encore plusieurs connexions électriques intermédiaires entre elles, entre leurs extrémités. 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.

La barre -bus 6 est positionnée par rapport aux pistes électriquement conductrices 3 de manière à ce que les pistes électriquement conductrices 3 et la barre-bus 6 définissent ensemble un élément électriquement conducteur dont la coopération avec la structure 4 définit ici une inductance.  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.

La barre-bus 6 est dans l’exemple considéré fixée par brasure sur la deuxième surface 2b de la portion 2 de carte de circuit imprimé 2, comme cela va être maintenant décrit. Cette barre -bus 6 présente alors plusieurs points de contact électrique avec la deuxième piste électriquement conductrice 3 en regard de laquelle elle se trouve, définissant ainsi des connexions électriques additionnelles avec cette piste.  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.

Pour réaliser le composant 1 , on procède par exemple comme suit :  To make component 1, we proceed for example as follows:

- on dispose la première partie de la structure 4 en matériau magnétiquement conducteur sur la première surface 2a de la portion de carte de circuit imprimé, de la colle 21 se présentant sous forme de bandes étant ici interposée entre cette première surface 2a et cette première partie de la stmcture 4,  - 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,

- on dispose le shunt 30 sur cette première surface 2a, de la pâte à braser étant alors interposée entre cette première surface 2a et ce shunt 30,  the shunt 30 is placed on this first surface 2a, solder paste then being interposed between this first surface 2a and this shunt 30,

- on dispose l’ensemble obtenu dans un four de refusion,  - the assembly obtained is placed in a reflow oven,

- on retourne après cuisson la portion 2 de carte de circuit imprimé et on dispose la deuxième partie de la stmcture 4 en matériau magnétiquement conducteur sur la deuxième surface 2b de la portion 2 de carte de circuit imprimé, des bandes de colle 21 étant interposées entre cette deuxième surface et cette deuxième partie de la stmcture,  - After cooking, 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,

- on dispose la barre-bus 6 sur cette deuxième surface 2b de la portion 2 de carte de circuit, de la pâte à braser étant alors interposée sous forme de plots 20 entre cette deuxième surface 2b et la barre -bus 6, et  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

- on dispose l’ensemble obtenu dans un four de refusion.  - the assembly obtained is placed in a reflow oven.

La pâte à brasure peut être déposée par sérigraphie. La colle peut être polymérisée dans le four ou lors d’un traitement préalable. On obtient ainsi le composant selon la figure 2. Ce composant 1 forme par exemple une bobine de lissage de courant qui peut être utilisée dans le circuit électrique précité. 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.

On va maintenant décrire en référence à la figure 3 un autre exemple de mise en œuvre de l’invention. Selon cet autre exemple, le composant 1 comprend deux structures 4 en matériau magnétiquement conducteur. Chacune de ces stmctures 4 est assemblée sur la portion 2 de carte de circuit imprimé, chacune de ces structures pouvant ou non s’étendre de part et d’autre de cette portion 2 de carte de circuit imprimé.  We will now describe with reference to FIG. 3 another example of implementation of the invention. According to this other example, 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.

Similairement à ce qui a été décrit en référence aux figures 1 et 2, la barre-bus 6 est fixée sur la portion 2 de carte de circuit imprimé et elle est disposée par rapport aux pistes électriquement conductrice de cette portion de carte qui ne sont pas visibles sur cette figure 3, de manière à former un élément électriquement conducteur. Cet élément électriquement conducteur coopère avec chaque structure 4 de manière à former, pour chaque coopération, une inductance qui est ici une bobine de filtrage CEM. Dans l’exemple de la figure 3, ces deux bobines de filtrage CEM sont montées en série et la portion de carte de circuit imprimé 2 porte deux condensateurs 25. Chacun de ces condensateurs 25 est associé à une des bobines de filtrage de manière à former avec cette bobine un filtre LC.  Similar to what has been described with reference to FIGS. 1 and 2, 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. In the example of FIG. 3, these two 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.

L’invention n’est pas limitée aux exemples qui viennent d’être décrits.  The invention is not limited to the examples which have just been described.

L’invention peut par exemple être utilisée pour réaliser en tout ou partie un transformateur. On réalise par exemple un enroulement secondaire à fort courant d’un transformateur avec la combinaison d’une barre -bus et d’une ou plusieurs pistes électriquement conductrice d’une portion d’un circuit imprimé selon l’invention, tandis que l’enroulement primaire à plus faible courant de ce transformateur est réalisé à l’aide d’autres pistes électriquement conductrices, ces dernières appartenant ou non à cette même portion de carte de circuit imprimé et cet enroulement primaire étant réalisé sans ajout d’une barre -bus.  The invention can for example be used to make all or part of a transformer. For example, 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 .

Dans des variantes non décrites, plusieurs barres-bus 6 peuvent être fixées sur la portion 2 de carte de circuit imprimé, ces barres-bus 6 étant empilées les unes sur les autres avec à chaque fois interposition d’un isolant électrique. L’élément électriquement conducteur est alors formé par : les pistes électriquement conductrices de la portion 2 de carte de circuit imprimé, et les barres bus 6 empilées.  In variants not described, several 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.

Claims

Revendications claims 1. Composant (1) formant au moins une inductance, le composant comprenant :  1. Component (1) forming at least one inductor, the component comprising: - au moins une structure (4) en un matériau magnétiquement conducteur,  - at least one structure (4) made of a magnetically conductive material, - une portion (2) de carte de circuit imprimé assemblée avec la structure (4) et contenant au moins une piste électriquement conductrice (3), et  a portion (2) of printed circuit board assembled with the structure (4) and containing at least one electrically conductive track (3), and - au moins une barre -bus (6) fixée sur la portion (2) de carte de circuit imprimé,  - at least one bus bar (6) fixed to the portion (2) of the printed circuit board, la barre-bus (6) et la piste électriquement conductrice (3) de la portion (2) de carte de circuit imprimé étant disposées l’une par rapport à l’autre de manière à former un élément électriquement conducteur coopérant avec la structure (4) en matériau magnétiquement conducteur pour former l’inductance, the bus bar (6) and the electrically conductive track (3) of the portion (2) of the printed circuit board being arranged relative to each other so as to form an electrically conductive element cooperating with the structure ( 4) in magnetically conductive material to form the inductance, la barre -bus (6) et la piste électriquement conductrice (3) de la portion (2) de carte de circuit imprimé étant directement connectées l’une à l’autre. the bus bar (6) and the electrically conductive track (3) of the portion (2) of the printed circuit board being directly connected to each other. 2. Composant selon la revendication 1, la barre -bus (6) et la piste électriquement conductrice (3) étant électriquement montées en parallèle.  2. Component according to claim 1, the bus bar (6) and the electrically conductive track (3) being electrically connected in parallel. 3. Composant selon la revendication 1 ou 2, la barre-bus (6) et la piste électriquement conductrice (3) étant superposées selon une direction perpendiculaire au plan d’extension de la portion (2) de carte de circuit imprimé.  3. Component according to claim 1 or 2, the bus bar (6) and the electrically conductive track (3) being superimposed in a direction perpendicular to the extension plane of the portion (2) of the printed circuit board. 4. Composant selon la revendication 3, la portion (2) de carte de circuit imprimé comprenant plusieurs pistes électriquement conductrices superposées selon une direction perpendiculaire au plan d’extension de cette portion (2) de carte de circuit imprimé, la barre -bus (6) étant superposée avec ces pistes électriquement conductrices (3) selon ladite direction.  4. Component according to claim 3, the portion (2) of printed circuit board comprising several electrically conductive tracks superimposed in a direction perpendicular to the extension plane of this portion (2) of printed circuit board, the bus bar ( 6) being superimposed with these electrically conductive tracks (3) in said direction. 5. Composant selon l’une quelconque des revendications 1 à 4, la structure (4) en matériau magnétiquement conducteur comprenant : une base (7), un couvercle (8) et une paroi de jonction (10) entre la base (7) et le couvercle (8), la base (7) étant disposée d’un premier côté de la portion (2) de carte de circuit imprimé et le couvercle (8) étant disposé d’un deuxième côté de la portion (2) de carte de circuit imprimé.  5. Component according to any one of claims 1 to 4, the structure (4) of magnetically conductive material comprising: a base (7), a cover (8) and a junction wall (10) between the base (7) and the cover (8), the base (7) being disposed on a first side of the portion (2) of printed circuit board and the cover (8) being disposed on a second side of the portion (2) of printed circuit board. 6. Composant selon l’une quelconque des revendications précédentes, la barre-bus (6) et la piste électriquement conductrice (3) définissant chacune plusieurs tours successifs autour d’un axe perpendiculaire au plan d’extension de la portion de carte de circuit imprimé.  6. Component according to any one of the preceding claims, the bus bar (6) and the electrically conductive track (3) each defining several successive turns around an axis perpendicular to the plane of extension of the circuit board portion. printed. 7. Composant selon les revendications 5 et 6, la paroi de jonction (10) comprenant une jambe (11) s’étendant sans discontinuité entre la base (7) et le couvercle (8), et la barre -bus (6) et la piste électriquement conductrice (3) définissant chacune plusieurs tours successifs autour de cette jambe (11).  7. Component according to claims 5 and 6, the junction wall (10) comprising a leg (11) extending without discontinuity between the base (7) and the cover (8), and the bus bar (6) and the electrically conductive track (3) each defining several successive turns around this leg (11). 8. Composant selon la revendication 7, la jambe (11) étant réalisée d’une seule pièce avec la base (7). 8. Component according to claim 7, the leg (11) being made in one piece with the base (7). 9. Composant selon l’une quelconque des revendications précédentes, l’élément électriquement conducteur formé par la barre -bus (6) et la piste électriquement conductrice (3) coopérant avec la stmcture (4) en matériau magnétiquement conducteur pour former plusieurs inductances distinctes. 9. Component according to any one of the preceding claims, the electrically conductive element formed by the bus bar (6) and the electrically conductive track (3) cooperating with the structure (4) made of magnetically conductive material to form several distinct inductances. . 10. Composant selon l’une quelconque des revendications précédentes, la portion (2) de carte de circuit imprimé portant au moins un condensateur (25) coopérant avec l’inductance pour former un filtre LC. 10. Component according to any one of the preceding claims, the portion (2) of printed circuit board carrying at least one capacitor (25) cooperating with the inductor to form an LC filter. 11. Composant selon l’une quelconque des revendications précédentes, comprenant un shunt (30) de mesure du courant, une extrémité (16, 17) de la barre -bus (6) étant raccordée à l’extrémité correspondante (13, 14) de la piste électriquement conductrice (3), et ces extrémités raccordées entre elles étant connectées au shunt (30) pour former une connexion vers un autre composant du circuit électrique, le shunt (30) étant notamment porté par la portion (2) de carte de circuit imprimé.  11. Component according to any one of the preceding claims, comprising a shunt (30) for measuring the current, one end (16, 17) of the bus bar (6) being connected to the corresponding end (13, 14) of the electrically conductive track (3), and these ends connected to each other being connected to the shunt (30) to form a connection to another component of the electrical circuit, the shunt (30) being in particular carried by the card portion (2) printed circuit board. 12. Composant selon la revendication 11, le shunt (30) étant porté par la portion (2) de carte de circuit imprimé et enjambant la piste électriquement conductrice (3).  12. Component according to claim 11, the shunt (30) being carried by the portion (2) of the printed circuit board and spanning the electrically conductive track (3). 13. Procédé de réalisation d’au moins une inductance, comprenant les étapes consistant à :  13. Method for producing at least one inductor, comprising the steps consisting in: - assembler une structure (4) en matériau magnétiquement conducteur avec une portion (2) de carte de circuit imprimé, cette portion (2) de circuit imprimé comprenant au moins une piste électriquement conductrice (3),  - assembling a structure (4) of magnetically conductive material with a portion (2) of printed circuit board, this portion (2) of printed circuit comprising at least one electrically conductive track (3), - fixer sur la portion (2) de carte de circuit imprimé au moins une barre -bus (6), après avoir disposé cette barre-bus (6) par rapport à la piste électriquement conductrice (3) de manière à directement connecter électriquement la barre-bus (6) et la piste électriquement conductrice (3) pour former un élément électriquement conducteur coopérant avec la structure (4) en matériau magnétiquement conducteur pour former l’inductance. - Fix on the portion (2) of the printed circuit board at least one bus bar (6), after having arranged this bus bar (6) relative to the electrically conductive track (3) so as to directly connect the electric bus bar (6) and the electrically conductive track (3) to form an electrically conductive element cooperating with the structure (4) of magnetically conductive material to form the inductance. 14. Procédé selon la revendication 13, dans lequel on fixe, notamment on brase, la barre -bus (6) sur la piste électriquement conductrice (3) de la portion (2) de carte de circuit imprimé. 14. The method of claim 13, wherein one fixes, especially brazing, the bus bar (6) on the electrically conductive track (3) of the portion (2) of the printed circuit board.
EP19759014.4A 2018-07-02 2019-07-02 Component forming at least one inductor for an electrical circuit Pending EP3818548A1 (en)

Applications Claiming Priority (2)

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FR1856077A FR3083364B1 (en) 2018-07-02 2018-07-02 COMPONENT FORMING AT LEAST ONE INDUCTANCE FOR ELECTRIC CIRCUIT
PCT/FR2019/051639 WO2020008140A1 (en) 2018-07-02 2019-07-02 Component forming at least one inductor for an electrical circuit

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FR3083364A1 (en) 2020-01-03
FR3083364B1 (en) 2025-01-10
CN112352297A (en) 2021-02-09

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