WO2021014087A1 - Magnetic shield for a contactless charging device of a motor vehicle - Google Patents

Magnetic shield for a contactless charging device of a motor vehicle Download PDF

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Publication number
WO2021014087A1
WO2021014087A1 PCT/FR2020/051311 FR2020051311W WO2021014087A1 WO 2021014087 A1 WO2021014087 A1 WO 2021014087A1 FR 2020051311 W FR2020051311 W FR 2020051311W WO 2021014087 A1 WO2021014087 A1 WO 2021014087A1
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WO
WIPO (PCT)
Prior art keywords
magnetic shielding
shielding screen
cylinder
bottom wall
coupler
Prior art date
Application number
PCT/FR2020/051311
Other languages
French (fr)
Inventor
Salim GUERROUDJ
Leyla HABAREK ARIOUA
Habib Boulzazen
Zouheir RIAH
Original Assignee
Institut Vedecom
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 Institut Vedecom filed Critical Institut Vedecom
Publication of WO2021014087A1 publication Critical patent/WO2021014087A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2270/00—Problem solutions or means not otherwise provided for
    • B60L2270/10—Emission reduction
    • B60L2270/14—Emission reduction of noise
    • B60L2270/147—Emission reduction of noise electro magnetic [EMI]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the present invention relates to the field of "contactless" charging of an electric supply battery of an electric or hybrid traction motor vehicle. More specifically, the invention relates to a magnetic shielding screen used in a contactless charging device of a motor vehicle.
  • Some motor vehicles have an electric powertrain, such as electric vehicles or hybrid vehicles. These vehicles may be fitted with a battery pack which is recharged using a charging system when it is discharged.
  • a charging system when it is discharged.
  • So-called contact battery charging solutions already exist and are based on a direct and continuous electrical connection between the battery and a charger, the latter thus delivering an electric current through this connection.
  • Such charging systems called contact charging systems, however, have the drawback of requiring manipulation by the user and require the use of electrical components. These manipulations are then complex, in particular due to the weight and the dangerousness of handling these components which can be subjected to high electrical voltage.
  • Contactless charging systems were then developed, these having at least two couplers each composed of a magnetic shielding screen and a coil. The couplers are then placed on the motor vehicle and on a support external to the motor vehicle, and in such a way that it exchanges electrical energy by means of a magnetic field. These contactless charging systems, however, can still be improved with regard to their energy transfer efficiency. In fact, the difficulties of "contactless” charging systems lie in capturing fields. magnetic by the coil, but also in the protection of users in the vicinity of the contactless charging device against these magnetic fields.
  • the object of the invention is therefore to alleviate these drawbacks and proposes a magnetic shielding screen for a contactless charging device of a motor vehicle which comprises at least one bottom wall and a raised edge extending at the outer periphery of the motor vehicle. the bottom wall, the raised edge and the bottom wall at least partially delimiting an internal space intended to receive at least one coil, the magnetic shielding screen being characterized in that it comprises at least one internal portion extending from the back wall into the internal space.
  • the function of the magnetic shielding screen is to channel magnetic fields.
  • it is formed from a composite material resulting from a mixture of which at least one of the components has the property of blocking magnetic field lines, for example ferrite.
  • the bottom wall, the raised edge and the internal portion provide an annular cup shape to the magnetic shielding screen which optimizes the channeling or capture of magnetic fields between the internal space and an area in front of the screen of magnetic shielding.
  • the internal space includes a ring-shaped area that surrounds the internal portion of the magnetic shielding screen.
  • Such a magnetic shielding screen can be used both in a coupler forming a source of electrical energy and in a coupler which forms a receiver of electrical energy. This is why the expression "between the internal space and a zone situated in front of the magnetic shielding screen" used in this document covers both a shielding screen associated with a magnetic field emission, but also a shielding screen associated with a magnetic field reception.
  • the raised edge has an angle of inclination relative to the bottom wall of between 30 ° and 60 °. Such an angle of inclination makes it possible to optimize the channeling or the capture of magnetic fields between the internal space and a zone situated in front of the magnetic shielding screen. This prevents the peripheral dissipation of magnetic fields.
  • the raised edge may include at least one chamfered corner, the latter participating in the optimization of the channel or in the capture of the magnetic field lines.
  • the raised edge and inner portion as described then act as a concentrator which directs the magnetic field to the area in front of the magnetic shield screen.
  • the inner portion emerges from the bottom wall so that it sits in the inner space of the magnetic shielding screen.
  • the inner portion is in front of the raised edge, that is, a plane parallel to the bottom wall and which intersects the inner portion also intersects the raised edge.
  • the internal portion In addition to its function which aims to increase the channeling or capture of the magnetic field, the internal portion also has the function of maintaining, that is to say to carry the coil in the internal space.
  • the internal portion comprises at least one cylinder which surrounds a recess of the magnetic shielding screen.
  • the cylinder of the inner portion extends along a cylinder direction secant to a plane of extension of the bottom wall.
  • the cylinder direction is in particular perpendicular to the plane of extension of the bottom wall.
  • the angle between the cylinder direction and the plane of extension of the bottom wall may be obtuse or acute, without however implying that the direction of the cylinder is coincident with the plane of extension of the bottom wall. .
  • the cylinder of the internal portion is at a non-zero distance from the raised edge.
  • the distance is measured along the back wall of the magnetic shielding screen, between the raised edge and the cylinder. In other words, the distance is measured along a straight line parallel to the bottom wall, between one foot of the cylinder and one foot of the raised edge.
  • the zone formed by the foot of the cylinder, the bottom wall and the foot of the raised edge then forms a zone of concentration of the magnetic field lines emitted by the coil and a zone of return of these magnetic field lines.
  • the raised edge extends over a first height and the internal portion extends over a second height, the first height being greater than the second height. More precisely, the cylinder of the internal portion extends over the second height. The first height and the second height are measured along a straight line perpendicular to the bottom wall of the magnetic shielding screen and from said bottom wall.
  • the recess is delimited at least by a through opening of the magnetic shielding screen.
  • the recess communicates with the internal space of the magnetic shielding screen, the latter then being devoid of a bottom wall in a portion surrounded by the cylinder.
  • the through-opening reduces the cost of manufacturing the magnetic shielding screen since the area, that is, the through-opening, is material-free.
  • Such a through opening is possible because the magnetic field is mainly channeled or captured by the internal portion and the raised edge of the magnetic shielding screen in the magnetic concentration zone, the latter being peripheral to the recess.
  • the internal portion comprises a plate which closes the recess.
  • the magnetic shielding screen recess is a blind hole.
  • the inner portion of the magnetic shielding screen then comprises the cylinder and the plate, the latter being integral with one end of the cylinder.
  • the plate blocks the magnetic field lines that may pass radially inside the cylinder and thus improves the protection of users located on the periphery of the magnetic shielding screen against the harmful effects of this magnetic field.
  • the plate extends from a free end of the cylinder. It is then understood that the plate extends into the internal space of the magnetic shielding screen.
  • the invention also relates to a coupler for a contactless charging device of a motor vehicle comprising at least one coil housed in a magnetic shielding screen according to any one of the preceding characteristics.
  • the contactless charging device may include at least one transmitter coupler and one receiver coupler, at least one of these couplers and advantageously both, comprises a magnetic shielding screen formed as explained above.
  • the coil surrounds the cylinder.
  • the coil is housed in an annular shaped area which surrounds the inner portion of the magnetic shielding screen.
  • the coil can then be secured to the cylinder by any appropriate fixing means, for example by gluing or screwing or clipping.
  • the invention also relates to a contactless charging device for an electric or hybrid traction motor vehicle, composed of at least two couplers according to the characteristics mentioned above. More specifically, the contactless charging device comprises a primary coupler and a secondary coupler.
  • the primary coupler then comprises a primary magnetic shielding screen in which is housed a primary coil and the secondary coupler comprises a secondary magnetic shielding screen in which is housed a secondary coil.
  • the primary coil is then able to transfer energy by induction to the secondary coil by means of a magnetic field.
  • the primary and secondary magnetic shielding screens then have the function of channeling or capturing this magnetic field circulating between them, so that it is mainly emitted from the primary coil or directed towards the secondary coil, making it possible to optimize the efficiency of this energy transfer.
  • the primary coupler is, for example, a coupler emitting magnetic fields, otherwise called a generator coupler, and the secondary coupler may be a coupler receiving magnetic fields.
  • the invention also covers a motor vehicle comprising at least one coupler according to at least one of the coupler characteristics described above.
  • FIG 1 is a perspective view of a magnetic shielding screen according to a first embodiment of the invention, in which a coil is disposed;
  • FIG 2 is a perspective and vertical sectional view of the magnetic shielding screen of Figure 1;
  • FIG 3 is a vertical sectional view of the magnetic shielding screen of Figure 2;
  • FIG 4 is a perspective view of a magnetic shielding screen according to a second embodiment of the invention;
  • FIG 5 is a schematic view of a contactless charging device of a motor vehicle, comprising a primary coupler and a secondary coupler according to the invention.
  • the characteristics, variants and the different embodiments of the invention can be associated with each other, in various combinations, as long as they are not incompatible or exclusive to each other. It is in particular possible to imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from in the state of the prior art.
  • a contactless charging device for a motor vehicle is composed of at least one magnetic shielding screen 4 and of at least one coil 6, the assembly forming a coupler 8.
  • the coil 6 is used to generate or to receive a magnetic field
  • the shielding screen magnetic 4 has the function of channeling and capturing said magnetic field so that it is able to be sent or received in a defined area.
  • the magnetic shielding screen 4 is formed from a composite material, at least one of the components of which has the property of directing magnetic field lines, for example ferrite.
  • the magnetic shielding screen 4 then makes it possible to improve the efficiency of the contactless charging device and also makes it possible to protect users close to said contactless charging device against the harmful effects of the magnetic field.
  • the magnetic shielding screen 4 comprises at least a bottom wall 10, a raised edge 12 and an internal portion 22.
  • the bottom wall 10 extends in a plane. extension A, visible in FIG. 2, and presents by way of example the shape of a quadrilateral.
  • the raised edge 12 extends in a raised edge plane B secant to the extension plane A of the bottom wall 10 and to the outer radial periphery of the bottom wall 10. More precisely, the raised edge 12 s 'extends from the outer periphery of the bottom wall 10 and has an angle of inclination a, visible in Figure 3, between 30 ° and 60 °, with the extension plane A of the bottom wall 10.
  • the raised edge 12 may comprise at least one chamfered corner 18, and in the example illustrated, the raised edge 12 has four chamfered corners 18.
  • the parallelepipedal shape presented here is given only by way of example, and it is understood that the invention covers any form of magnetic shielding screen as long as the latter comprises a bottom, a raised edge and an internal portion which extends into the bowl delimited by the raised edge.
  • the configuration of the internal portion 22 relative to the bottom wall 10 as well as its structure, and that of the raised edge 12 relative to the bottom wall 10 as well as its structure, make it possible to channel or capture the magnetic field towards or from the magnetic shielding screen 4.
  • the raised edge 12 and the bottom wall 10 participate in partially delimiting an internal space 20.
  • the internal space 20 corresponds to the space in which the magnetic field circulates and it is understood that this space internal 20 is open to the outside of the magnetic shielding screen 4.
  • the internal portion 22 of the magnetic shielding screen 4 extends from the bottom wall 10, into the internal space 20 of the magnetic shielding screen.
  • magnetic shielding 4 and at least partially defines a recess 24 in the magnetic shielding screen 4.
  • the recess 24 is, in this first embodiment, a blind hole delimited by a cylinder 26 and a plate 28 perpendicular to a direction of revolution of cylinder 26 and say placed at one end of cylinder 26.
  • cylinder 26 takes the form of a quadrilateral which extends in the internal space 20 of the magnetic shielding screen 4.
  • the cylinder 26 extends along a direction of cylinder C passing through an axis of revolution of cylinder 26 and sequent to the extension plane A of the bottom wall 10.
  • the direction of cylinder C is perpendicular to the plane d 'extension A of the bottom wall 10, but it is understood that alternatively the angle between the cylinder direction C and the extension plane A of the bottom wall 10 can be obtuse or acute.
  • a section of the annular zone of the internal space 20 can take the form of a "V" which opens on either side of the bottom wall 10, but this section can also take the form of a "U” combined with a "V” as is the case with the representation of Figures 1 to 3.
  • This section can still take the form of a "V" where one of the branches of the V is superimposed above of the back wall 10.
  • the foot 14 of the raised edge is defined as the junction between the bottom wall 10 and the raised edge 12.
  • the distal end 16 is also understood to mean the free end of the raised edge 12 opposite the raised edge foot 14, i.e. i.e. the end of the raised edge furthest from the bottom wall 10.
  • the cylinder 26 includes a cylinder foot 30 and a cylinder end 32.
  • the foot 30 of the cylinder corresponds to the junction between the bottom wall 10 and the cylinder 26 and the end 32 of the cylinder corresponds to the end of the cylinder 26 opposite the foot of the cylinder 30, that is to say the most away from the back wall 10.
  • the raised edge 12 extends over a first height H l, measured along a straight line perpendicular to the bottom wall 10 between the foot 14 of the raised edge and the distal end 16 of the raised edge.
  • the cylinder 26 extends over a second height H2, measured along a straight line perpendicular to the bottom wall 10, between the foot 30 of the cylinder and the end 32 of the cylinder.
  • the first height H l of the raised edge 12 is then greater than the second height H2 of the cylinder 26. It is thus understood that the cylinder 26 is contained within the thickness of the internal space and does not extend outside the 'internal space 20 of the magnetic shielding screen 4.
  • the cylinder 26 is at a non-zero distance DI from the raised edge 12.
  • the distance DI is then measured along the bottom wall 10, between the foot 30 of the cylinder and the foot 14 of the cylinder. raised edge.
  • the zone surrounded by the foot 30 of the cylinder, the bottom wall 10 and the foot 13 of the raised edge then forms a concentration zone 33 of the magnetic field lines emitted or received by the coil 6.
  • concentration zone 33 is understood to mean, an area where the most magnetic activity is observed on the magnetic shielding screen 4.
  • the internal portion 22 comprises a plate 28.
  • the recess 24 of the magnetic shielding screen 4 is thus closed by the plate 28, extending at the level of the free end. 32 of the cylinder 26.
  • the plate 28 then extends into the internal space 20 of the magnetic shielding screen 4 and increases the protection of users against the magnetic field generated or received by the coil 6, by virtue of the property of permeability. magnetic provided by the ferrite.
  • the cylinder 26 comprises a radially outer face 34 facing the raised edge 12 and a radially inner face 36 facing the recess 24 and opposite to the radially outer face 34.
  • the coil 6 is then disposed against the radially outer face 34 of the cylinder 26, such that it surrounds the latter. It will therefore be understood that the coil 6 is disposed in the internal space 20 of the magnetic shielding screen 4.
  • the coil 6 can then be secured to the radially outer face 34 of the cylinder 26 by any means offering suitable fixing, for example for example by gluing, screwing or clipping.
  • the magnetic shielding screen 4 as just described, associated with the coil 6 forms what will be called the coupler 8 in the following.
  • the function of the coupler 8 is for example to generate a magnetic field, by means of the coil 6, the magnetic shielding screen 4 then making it possible to direct the magnetic field towards a determined zone situated in front of said coupler 8, by virtue of its property of magnetic permeability mentioned above.
  • the coupler 8 may have the function of receiving a magnetic field, by means of the coil 6, the magnetic shielding screen 4 then making it possible to optimize the capture of said magnetic field by concentrating it towards the coil 6 by means of the raised edge 12 and the internal portion 22.
  • FIG. 4 illustrating a perspective view of the magnetic shielding screen 4 according to this second embodiment. It should be considered that in the remainder of the description, only the characteristics of the second embodiment different from the first embodiment of the magnetic shielding screen 4 will be explained. For the common characteristics, reference should be made to Figures 1 to 3 and their description which applies mutatis mutandis to Figure 4.
  • the recess 24 of the magnetic shielding screen 4 is delimited. at least by a through opening 38.
  • through opening 38 it is understood that the recess 24 bordered by the cylinder 26 communicates with the internal space 20 of the magnetic shielding screen 4.
  • the through opening 38 completes the recess 24 and it is through this through opening 38 that one passes from the recess 24 to the internal space 20 of the magnetic shielding screen 4.
  • Such a through opening 38 is possible by the fact that the magnetic field is mainly channeled between the raised edge 12 and the cylinder 26 of the magnetic shielding screen 4, in the concentration zone 33. This allows a reduction in cost. production of the magnetic shielding screen 4 since the recess 24 of this second embodiment of the invention is devoid of material.
  • FIG. 5 showing a schematic view of the contactless charging device 1 according to the invention.
  • the contactless charging device 1 can be used for the motor vehicle 2 with electric or hybrid traction, and comprises at least two couplers 8 according to the characteristics mentioned above.
  • a primary coupler 40 and a secondary coupler 42 are then defined.
  • the primary coupler 40 comprises a primary magnetic shielding screen 4a and a primary coil 6a
  • the secondary coupler 42 comprises a secondary magnetic shielding screen 4b and a secondary coil 6b. .
  • the primary coupler 40 is arranged in a support 44 outside the motor vehicle 2, which may for example be a road or a zone dedicated to the parking of the motor vehicle 2, or any other support capable of accommodating said primary coupler 40.
  • the secondary coupler 42 is it disposed within the motor vehicle 2, and more precisely so that it is facing the outer support 44 carrying the primary coupler 40. Even more precisely, the primary coupler 40 and the secondary coupler 42 are respectively arranged in the outer support 44 and in the motor vehicle 2, such that they are facing each other, their vertical median axes being for example the same.
  • the primary coupler 40 is connected to an external electrical energy source 50, for example an urban electrical network, or any other energy source. Electrical enabling the primary coil 6a to be energized. It is then understood that the primary coil 6a is the energy emitting coil and that, on the contrary, the secondary coil 6b is the receiving coil of the energy generated by the primary coil 6a.
  • the primary coil 6a transfers electrical energy to the secondary coil 6b by means of a magnetic field. More precisely, the primary coil 6a emits a magnetic field channeled by the primary magnetic shielding screen 4a, so that it is directed in the direction of the secondary coupler 42 disposed opposite the primary coupler 40.
  • the secondary magnetic shielding screen 4b channels the magnetic field emitted by the primary coil 6a so that it is concentrated towards the secondary coil 6b. It is then understood that the transfer of energy from the primary coil 6a to the secondary coil 6b is a transfer of energy by induction and that the primary magnetic shielding screen 4a and the secondary magnetic shielding screen 4b optimize this transfer d energy by channeling the magnetic field between the primary and secondary coils 6a, 6b by virtue of their property of magnetic permeability and their particular structure.
  • the secondary coupler 42 is electrically connected for example to an electrical storage device 52 of the motor vehicle 2 in order to charge it with electrical energy, coming from the external energy source 50.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention relates to a magnetic shield (4) of a contactless charging device of a motor vehicle, comprising an inner portion (22), around which a coil is arranged (6), wherein the coupler (8) is formed by the magnetic shield (4) and the coil (6) is able to send or receive a magnetic field, said magnetic field being channeled by the magnetic shield (4).

Description

Description Description
Titre : Ecran de blindage maçpétique pour un dispositif de charge sans contact d’un véhicule automobile Title: Maspetic shielding screen for a contactless charging device of a motor vehicle
La présente invention revendique la priorité de la demande française 1908439 déposée le 25 juillet 20 19 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. The present invention claims the priority of French application 1908439 filed July 25, 19, the content of which (text, drawings and claims) is incorporated herein by reference.
La présente invention concerne le domaine de la charge « sans contact » d’une batterie d’alimentation électrique d’un véhicule automobile à traction électrique ou hybride. Plus précisément, l’invention porte sur un écran de blindage magnétique utilisé dans un dispositif de charge sans contact d’un véhicule automobile. The present invention relates to the field of "contactless" charging of an electric supply battery of an electric or hybrid traction motor vehicle. More specifically, the invention relates to a magnetic shielding screen used in a contactless charging device of a motor vehicle.
Certains véhicules automobiles disposent d’une chaîne de traction électrique, comme les véhicules électriques ou les véhicules hybrides. Ces véhicules peuvent être équipés d’une batterie d’alimentation qui est rechargée à l’aide d’un système de charge quand elle est déchargée. Des solutions de charge de batterie, dites avec contact, existent déjà et reposent sur une connexion électrique direct et continue entre la batterie et un chargeur, ce dernier délivrant ainsi un courant électrique au travers de cette connexion . De tels systèmes de charge, dit avec contact, présentent cependant l’inconvénient de nécessiter des manipulations de la part de l’utilisateur et imposent l’utilisation de composants électriques. Ces manipulations s’avèrent alors complexes notamment de par le poids et de par la dangerosité de la manipulation de ces composants qui peuvent être soumis à une tension électrique élevée. Some motor vehicles have an electric powertrain, such as electric vehicles or hybrid vehicles. These vehicles may be fitted with a battery pack which is recharged using a charging system when it is discharged. So-called contact battery charging solutions already exist and are based on a direct and continuous electrical connection between the battery and a charger, the latter thus delivering an electric current through this connection. Such charging systems, called contact charging systems, however, have the drawback of requiring manipulation by the user and require the use of electrical components. These manipulations are then complex, in particular due to the weight and the dangerousness of handling these components which can be subjected to high electrical voltage.
Des systèmes de charge « sans contact » ont alors été développés, ceux-ci présentant au moins deux coupleurs composés chacun d’un écran de blindage magnétique et d’une bobine. Les coupleurs sont alors disposés sur le véhicule automobile et sur un support extérieur au véhicule automobile, et de telle sorte qu’il échange de l’énergie électrique au moyen d’un champ magnétique. Ces systèmes de charge sans contact restent cependant perfectibles en ce qui concerne leur rendement de transfert d’énergie. En effet, les difficultés des systèmes de charge « sans contact » résident dans la captation des champs magnétiques par la bobine, mais également dans la protection des utilisateurs se trouvant à proximité du dispositif de charge sans contact contre ces champs magnétiques. “Contactless” charging systems were then developed, these having at least two couplers each composed of a magnetic shielding screen and a coil. The couplers are then placed on the motor vehicle and on a support external to the motor vehicle, and in such a way that it exchanges electrical energy by means of a magnetic field. These contactless charging systems, however, can still be improved with regard to their energy transfer efficiency. In fact, the difficulties of "contactless" charging systems lie in capturing fields. magnetic by the coil, but also in the protection of users in the vicinity of the contactless charging device against these magnetic fields.
L’invention a donc pour but de palier à ces inconvénients et propose un écran de blindage magnétique pour un dispositif de charge sans contact d’un véhicule automobile qui comprend au moins une paroi de fond et un bord relevé s’étendant en périphérie externe de la paroi de fond, le bord relevé et la paroi de fond délimitant au moins partiellement un espace interne destiné à recevoir au moins une bobine, l’écran de blindage magnétique étant caractérisé en ce qu’il comprend au moins une portion interne s’étendant depuis la paroi de fond dans l’espace interne. The object of the invention is therefore to alleviate these drawbacks and proposes a magnetic shielding screen for a contactless charging device of a motor vehicle which comprises at least one bottom wall and a raised edge extending at the outer periphery of the motor vehicle. the bottom wall, the raised edge and the bottom wall at least partially delimiting an internal space intended to receive at least one coil, the magnetic shielding screen being characterized in that it comprises at least one internal portion extending from the back wall into the internal space.
L’écran de blindage magnétique a pour fonction de canaliser les champs magnétiques. A cet effet, il est formé dans un matériau composite résultant d’un mélange dont au moins un des composants a la propriété de bloquer des lignes de champ magnétique, par exemple de la ferrite. La paroi de fond, le bord relevé et la portion interne procurent une forme de cuvette annulaire à l’écran de blindage magnétique qui optimise la canalisation ou la captation des champs magnétiques entre l’espace interne et une zone située en face de l’écran de blindage magnétique. L’espace interne comprend une zone de forme annulaire qui entoure la portion interne de l’écran de blindage magnétique. The function of the magnetic shielding screen is to channel magnetic fields. For this purpose, it is formed from a composite material resulting from a mixture of which at least one of the components has the property of blocking magnetic field lines, for example ferrite. The bottom wall, the raised edge and the internal portion provide an annular cup shape to the magnetic shielding screen which optimizes the channeling or capture of magnetic fields between the internal space and an area in front of the screen of magnetic shielding. The internal space includes a ring-shaped area that surrounds the internal portion of the magnetic shielding screen.
Un tel écran de blindage magnétique est utilisable tant dans un coupleur formant une source d’énergie électrique que dans un coupleur qui forme un récepteur d’énergie électrique. C’est pourquoi l’expression « entre l’espace interne et une zone située en face de l’écran de blindage magnétique » employée dans ce document couvre à la fois un écran de blindage associé à une émission de champ magnétique, mais aussi un écran de blindage associé à une réception de champ magnétique. Such a magnetic shielding screen can be used both in a coupler forming a source of electrical energy and in a coupler which forms a receiver of electrical energy. This is why the expression "between the internal space and a zone situated in front of the magnetic shielding screen" used in this document covers both a shielding screen associated with a magnetic field emission, but also a shielding screen associated with a magnetic field reception.
Selon un exemple de l’invention, le bord relevé présente un angle d’inclinaison par rapport à la paroi de fond compris entre 30 ° et 60 °. Un tel angle d’inclinaison permet d’optimiser la canalisation ou la captation des champs magnétiques entre l’espace interne et une zone située en face de l’écran de blindage magnétique. On empêche ainsi la dissipation périphérique des champs magnétiques. De même, le bord relevé peut comprendre au moins un coin chanfreiné, celui-ci participant à l’optimisation de la canalisation ou de la captation des lignes de champ magnétique. Le bord relevé et la portion interne tels qu’ils sont décrits agissent alors comme un concentrateur qui dirige le champ magnétique vers la zone en face de l’écran de blindage magnétique. According to an example of the invention, the raised edge has an angle of inclination relative to the bottom wall of between 30 ° and 60 °. Such an angle of inclination makes it possible to optimize the channeling or the capture of magnetic fields between the internal space and a zone situated in front of the magnetic shielding screen. This prevents the peripheral dissipation of magnetic fields. Likewise, the raised edge may include at least one chamfered corner, the latter participating in the optimization of the channel or in the capture of the magnetic field lines. The raised edge and inner portion as described then act as a concentrator which directs the magnetic field to the area in front of the magnetic shield screen.
La portion interne émerge de la paroi de fond de telle sorte qu’elle se situe dans l’espace interne de l’écran de blindage magnétique. La portion interne est en face du bord relevé, c’est-à-dire qu’un plan parallèle à la paroi de fond et qui coupe la portion interne coupe également le bord relevé. En plus de sa fonction qui vise à augmenter la canalisation ou la captation du champ magnétique, la portion interne a également pour fonction de maintenir, c’est-à-dire de porter la bobine dans l’espace interne. The inner portion emerges from the bottom wall so that it sits in the inner space of the magnetic shielding screen. The inner portion is in front of the raised edge, that is, a plane parallel to the bottom wall and which intersects the inner portion also intersects the raised edge. In addition to its function which aims to increase the channeling or capture of the magnetic field, the internal portion also has the function of maintaining, that is to say to carry the coil in the internal space.
Selon une caractéristique de l’invention, la portion interne comprend au moins un cylindre qui entoure un évidement de l’écran de blindage magnétique. According to a characteristic of the invention, the internal portion comprises at least one cylinder which surrounds a recess of the magnetic shielding screen.
Selon une caractéristique de l’invention, le cylindre de la portion interne s’étend le long d’une direction de cylindre sécante d’un plan d’extension de la paroi de fond. According to a feature of the invention, the cylinder of the inner portion extends along a cylinder direction secant to a plane of extension of the bottom wall.
La direction de cylindre est notamment perpendiculaire au plan d’extension de la paroi de fond. De manière alternative, l’angle entre la direction de cylindre et le plan d’extension de la paroi de fond peut être obtus ou aigu, sans néanmoins impliquer que la direction de cylindre soit confondue avec le plan d’extension de la paroi de fond. The cylinder direction is in particular perpendicular to the plane of extension of the bottom wall. Alternatively, the angle between the cylinder direction and the plane of extension of the bottom wall may be obtuse or acute, without however implying that the direction of the cylinder is coincident with the plane of extension of the bottom wall. .
Selon une caractéristique de l’invention, le cylindre de la portion interne est à une distance non nulle du bord relevé. La distance est mesurée le long de la paroi de fond de l’écran de blindage magnétique, entre le bord relevé et le cylindre. Dit autrement, la distance est mesurée suivant une droite parallèle à la paroi de fond, entre un pied du cylindre et un pied du bord relevé. According to a characteristic of the invention, the cylinder of the internal portion is at a non-zero distance from the raised edge. The distance is measured along the back wall of the magnetic shielding screen, between the raised edge and the cylinder. In other words, the distance is measured along a straight line parallel to the bottom wall, between one foot of the cylinder and one foot of the raised edge.
La zone formée par le pied du cylindre, la paroi de fond et le pied du bord relevé forme alors une zone de concentration des lignes de champ magnétique émises par la bobine et une zone de renvoi de ces lignes de champ magnétique. Selon une caractéristique de l’invention, le bord relevé s’étend sur une première hauteur et la portion interne s’étend sur une deuxième hauteur, la première hauteur étant supérieure à la deuxième hauteur. De manière plus précise, le cylindre de la portion interne s’étend sur la deuxième hauteur. La première hauteur et la deuxième hauteur sont mesurées suivant une droite perpendiculaire à la paroi de fond de l’écran de blindage magnétique et à partir de ladite paroi de fond. The zone formed by the foot of the cylinder, the bottom wall and the foot of the raised edge then forms a zone of concentration of the magnetic field lines emitted by the coil and a zone of return of these magnetic field lines. According to one characteristic of the invention, the raised edge extends over a first height and the internal portion extends over a second height, the first height being greater than the second height. More precisely, the cylinder of the internal portion extends over the second height. The first height and the second height are measured along a straight line perpendicular to the bottom wall of the magnetic shielding screen and from said bottom wall.
Selon une caractéristique de l’invention, l’évidement est délimité au moins par une ouverture traversante de l’écran de blindage magnétique. Dit autrement, l’évidement communique avec l’espace interne de l’écran de blindage magnétique, ce dernier étant alors dépourvue de paroi de fond dans une portion ceinturée par le cylindre. According to a feature of the invention, the recess is delimited at least by a through opening of the magnetic shielding screen. In other words, the recess communicates with the internal space of the magnetic shielding screen, the latter then being devoid of a bottom wall in a portion surrounded by the cylinder.
L’ouverture traversante permet de réduire le coût de fabrication de l’écran de blindage magnétique puisque la zone, c’est-à-dire l’ouverture traversante, est dépourvue de matière. Une telle ouverture traversante est possible du fait que le champ magnétique est majoritairement canalisé ou capté par la portion interne et le bord relevé de l’écran de blindage magnétique dans la zone de concentration magnétique, celle-ci étant périphérique de l’évidement. The through-opening reduces the cost of manufacturing the magnetic shielding screen since the area, that is, the through-opening, is material-free. Such a through opening is possible because the magnetic field is mainly channeled or captured by the internal portion and the raised edge of the magnetic shielding screen in the magnetic concentration zone, the latter being peripheral to the recess.
Selon une alternative, la portion interne comprend une plaque qui ferme l’évidement. Dit autrement, l’évidement de l’écran de blindage magnétique est un trou borgne. La portion interne de l’écran de blindage magnétique comprend alors le cylindre et la plaque, cette dernière étant solidaire d’une extrémité du cylindre. La plaque permet de bloquer les lignes de champ magnétique pouvant passer radialement à l’intérieur du cylindre et améliore ainsi la protection des usagers situés en périphérie de l’écran de blindage magnétique contre les effets néfastes de ce champ magnétique. According to an alternative, the internal portion comprises a plate which closes the recess. In other words, the magnetic shielding screen recess is a blind hole. The inner portion of the magnetic shielding screen then comprises the cylinder and the plate, the latter being integral with one end of the cylinder. The plate blocks the magnetic field lines that may pass radially inside the cylinder and thus improves the protection of users located on the periphery of the magnetic shielding screen against the harmful effects of this magnetic field.
Selon une caractéristique de l’invention, la plaque s’étend depuis une extrémité libre du cylindre. On comprend alors que la plaque s’étend dans l’espace interne de l’écran de blindage magnétique. According to a feature of the invention, the plate extends from a free end of the cylinder. It is then understood that the plate extends into the internal space of the magnetic shielding screen.
L’invention porte également sur un coupleur d’un dispositif de charge sans contact d’un véhicule automobile comprenant au moins une bobine logée dans un écran de blindage magnétique selon l’une quelconque des caractéristiques précédentes. The invention also relates to a coupler for a contactless charging device of a motor vehicle comprising at least one coil housed in a magnetic shielding screen according to any one of the preceding characteristics.
Le dispositif de charge sans contact peut comprendre au moins un coupleur émetteur et un coupleur récepteur, au moins l’un de ces coupleurs et avantageusement les deux, comprend un écran de blindage magnétique formé comme expliqué ci-dessus. The contactless charging device may include at least one transmitter coupler and one receiver coupler, at least one of these couplers and advantageously both, comprises a magnetic shielding screen formed as explained above.
Selon une caractéristique du coupleur, la bobine entoure le cylindre. En particulier, la bobine est logée dans une zone de forme annulaire qui entoure la portion interne de l’écran de blindage magnétique. La bobine peut alors être solidarisée au cylindre par tout moyen de fixation approprié, par exemple par collage ou vissage ou clipage. According to one characteristic of the coupler, the coil surrounds the cylinder. In particular, the coil is housed in an annular shaped area which surrounds the inner portion of the magnetic shielding screen. The coil can then be secured to the cylinder by any appropriate fixing means, for example by gluing or screwing or clipping.
L’invention porte également sur un dispositif de charge sans contact d’un véhicule automobile à traction électrique ou hybride, composé d’au moins deux coupleurs selon les caractéristiques évoquées ci-dessus. De manière plus précise, le dispositif de charge sans contact comprend un coupleur primaire et un coupleur secondaire. Le coupleur primaire comprend alors un écran de blindage magnétique primaire dans lequel est logée une bobine primaire et le coupleur secondaire comprend un écran de blindage magnétique secondaire dans lequel est logée une bobine secondaire. La bobine primaire est alors apte à réaliser un transfert d’énergie par induction vers la bobine secondaire au moyen d’un champ magnétique. Les écrans de blindage magnétique primaire et secondaire ont alors pour fonction de canaliser ou capter ce champ magnétique circulant entre eux, afin que celui-ci soit majoritairement émis depuis la bobine primaire ou dirigé vers la bobine secondaire, permettant d’optimiser le rendement de ce transfert d’énergie. De la sorte, on limite les pertes d’énergie et on augmente la protection des usagers situés en périphérie du dispositif de charge sans contact contre le champ magnétique. Le coupleur primaire est par exemple un coupleur émetteur des champs magnétiques, autrement appelé coupleur générateur, et le coupleur secondaire peut être un coupleur récepteur des champs magnétique. L’invention couvre également un véhicule automobile comprenant au moins un coupleur selon au moins une des caractéristiques de coupleur exposées précédemment. The invention also relates to a contactless charging device for an electric or hybrid traction motor vehicle, composed of at least two couplers according to the characteristics mentioned above. More specifically, the contactless charging device comprises a primary coupler and a secondary coupler. The primary coupler then comprises a primary magnetic shielding screen in which is housed a primary coil and the secondary coupler comprises a secondary magnetic shielding screen in which is housed a secondary coil. The primary coil is then able to transfer energy by induction to the secondary coil by means of a magnetic field. The primary and secondary magnetic shielding screens then have the function of channeling or capturing this magnetic field circulating between them, so that it is mainly emitted from the primary coil or directed towards the secondary coil, making it possible to optimize the efficiency of this energy transfer. In this way, energy losses are limited and the protection of users located on the periphery of the contactless charging device against the magnetic field is increased. The primary coupler is, for example, a coupler emitting magnetic fields, otherwise called a generator coupler, and the secondary coupler may be a coupler receiving magnetic fields. The invention also covers a motor vehicle comprising at least one coupler according to at least one of the coupler characteristics described above.
D’autres caractéristiques, détails et avantages de l’invention ressortiront plus clairement à la lecture de la description qui suit d’une part, et de plusieurs exemples de réalisation donnés à titre indicatif et non limitatif en référence aux dessins schématiques annexés d’autre part, sur lesquels : Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows, on the one hand, and several embodiments given by way of indication and not by way of limitation with reference to the appended schematic drawings on the other share, on which:
[Fig 1] est une vue en perspective d’un écran de blindage magnétique selon un premier mode de réalisation de l’invention, dans lequel est disposé une bobine ; [Fig 1] is a perspective view of a magnetic shielding screen according to a first embodiment of the invention, in which a coil is disposed;
[Fig 2] est une vue en perspective et en coupe verticale de l’écran de blindage magnétique de la figure 1 ; [Fig 2] is a perspective and vertical sectional view of the magnetic shielding screen of Figure 1;
[Fig 3] est une vue en coupe verticale de l’écran de blindage magnétique de la figure 2 ; [Fig 4] est une vue en perspective d’un écran de blindage magnétique selon un deuxième mode de réalisation de l’invention ; [Fig 3] is a vertical sectional view of the magnetic shielding screen of Figure 2; [Fig 4] is a perspective view of a magnetic shielding screen according to a second embodiment of the invention;
[Fig 5] est une vue schématique d’un dispositif de charge sans contact d’un véhicule automobile, comprenant un coupleur primaire et un coupleur secondaire selon l’invention . Les caractéristiques, variantes et les différentes formes de réalisation de l’invention peuvent être associées les unes avec les autres, selon diverses combinaisons, dans la mesure où elles ne sont pas incompatibles ou exclusives les unes aux autres. On pourra notamment imaginer des variantes de l’invention ne comprenant qu’une sélection de caractéristiques décrites par la suite de manière isolée des autres caractéristiques décrites, si cette sélection de caractéristiques est suffisante pour conférer un avantage technique ou pour différencier l’invention par rapport à l’état de la technique antérieur. [Fig 5] is a schematic view of a contactless charging device of a motor vehicle, comprising a primary coupler and a secondary coupler according to the invention. The characteristics, variants and the different embodiments of the invention can be associated with each other, in various combinations, as long as they are not incompatible or exclusive to each other. It is in particular possible to imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from in the state of the prior art.
Un dispositif de charge sans contact selon l’invention pour un véhicule automobile est composé d’au moins un écran de blindage magnétique 4 et d’au moins une bobine 6, l’ensemble formant un coupleur 8. La bobine 6 sert à générer ou à recevoir un champ magnétique, tandis que l’écran de blindage magnétique 4 a pour fonction de canaliser et de capter ledit champ magnétique afin que celui-ci soit apte à être envoyé ou reçu dans une zone définie. A cet effet, l’écran de blindage magnétique 4 est formé d’un matériau composite dont au moins un des composants présente la propriété de diriger des lignes de champ magnétique, par exemple de la ferrite. L’écran de blindage magnétique 4 permet alors d’améliorer le rendement du dispositif de charge sans contact et permet également de protéger les utilisateurs proches dudit dispositif de charge sans contact, contre les effets néfastes du champ magnétique. Deux modes de réalisation de l’écran de blindage magnétique 4 vont être exposés dans la suite de la description détaillée. Le premier mode de réalisation de l’écran de blindage magnétique 4 va être décrit en rapport avec les figures 1 à 3 et le deuxième mode de réalisation est décrit à la figure 4, l’un ou l’autre de ces modes de réalisation pouvant être incorporé dans le coupleur, et plus généralement dans le dispositif de charge sans contact illustré à la figure 5. A contactless charging device according to the invention for a motor vehicle is composed of at least one magnetic shielding screen 4 and of at least one coil 6, the assembly forming a coupler 8. The coil 6 is used to generate or to receive a magnetic field, while the shielding screen magnetic 4 has the function of channeling and capturing said magnetic field so that it is able to be sent or received in a defined area. To this end, the magnetic shielding screen 4 is formed from a composite material, at least one of the components of which has the property of directing magnetic field lines, for example ferrite. The magnetic shielding screen 4 then makes it possible to improve the efficiency of the contactless charging device and also makes it possible to protect users close to said contactless charging device against the harmful effects of the magnetic field. Two embodiments of the magnetic shielding screen 4 will be explained in the remainder of the detailed description. The first embodiment of the magnetic shielding screen 4 will be described with reference to Figures 1 to 3 and the second embodiment is described in Figure 4, either of these embodiments being able to be incorporated in the coupler, and more generally in the contactless charging device illustrated in FIG. 5.
Sur les figures 1 à 3, l’écran de blindage magnétique 4 comprend au moins une paroi de fond 10 , un bord relevé 12 et une portion interne 22. Dans l’exemple illustré, la paroi de fond 10 s’étend dans un plan d’extension A, visible à la figure 2, et présente à titre d’exemple la forme d’un quadrilatère. Le bord relevé 12 s’étend dans un plan de bord relevé B sécant au plan d’extension A de la paroi de fond 10 et à la périphérie radiale externe de la paroi de fond 10. De manière plus précise, le bord relevé 12 s’étend depuis la périphérie externe de la paroi de fond 10 et présente un angle d’inclinaison a, visible à la figure 3, compris entre 30 ° et 60 °, avec le plan d’extension A de la paroi de fond 10. Le bord relevé 12 peut comprendre au moins un coin chanfreiné 18 , et dans l’exemple illustré, le bord relevé 12 présente quatre coins chanfreinés 18. La forme parallélépipédique présentée ici n’est donnée qu’à titre d’exemple, et il est entendu que l’invention couvre toute forme d’écran de blindage magnétique tant que celui-ci comprend un fond, un bord relevé et une portion interne qui s’étend dans la cuvette délimitée par le bord relevé. La configuration de la portion interne 22 par rapport à la paroi de fond 10 ainsi que sa structure, et celle du bord relevé 12 par rapport à la paroi de fond 10 ainsi que sa structure, permettent de canaliser ou capter le champ magnétique vers ou depuis l’écran de blindage magnétique 4. Le bord relevé 12 et la paroi de fond 10 participent à délimiter en partie un espace interne 20. L’espace interne 20 correspond à l’espace dans lequel circule le champ magnétique et on comprend que cet espace interne 20 est ouvert vers l’extérieur de l’écran de blindage magnétique 4. La portion interne 22 de l’écran de blindage magnétique 4 s’étend depuis la paroi de fond 10 , dans l’espace interne 20 de l’écran de blindage magnétique 4, et délimite au moins en partie un évidement 24 dans l’écran de blindage magnétique 4. L’évidement 24 est, dans ce premier mode de réalisation, un trou borgne délimité par un cylindre 26 et une plaque 28 perpendiculaire à une direction de révolution du cylindre 26 et disposée à un bout du cylindre 26. Dans l’exemple illustré, le cylindre 26 prend la forme d’un quadrilatère qui s’étend dans l’espace interne 20 de l’écran de blindage magnétique 4. De manière plus précise, le cylindre 26 s’étend le long d’une direction de cylindre C passant par un axe de révolution du cylindre 26 et séquent au plan d’extension A de la paroi de fond 10. De préférence, la direction de cylindre C est perpendiculaire au plan d’extension A de la paroi de fond 10 , mais on comprend que de manière alternative l’angle entre la direction de cylindre C et le plan d’extension A de la paroi de fond 10 peut être obtus ou aigu. Dit autrement, une section de la zone annulaire de l’espace interne 20 peut prendre la forme d’un « V » qui s’ouvre de chaque côté de la paroi de fond 10 , mais cette section peut aussi prendre la forme d’un « U » combinée à un « V » comme c’est le cas de la représentation des figures 1 à 3. Enfin, Cette section peut encore prendre la forme d’une « V » où une des branches du V se superpose au-dessus de la paroi de fond 10. In Figures 1 to 3, the magnetic shielding screen 4 comprises at least a bottom wall 10, a raised edge 12 and an internal portion 22. In the example illustrated, the bottom wall 10 extends in a plane. extension A, visible in FIG. 2, and presents by way of example the shape of a quadrilateral. The raised edge 12 extends in a raised edge plane B secant to the extension plane A of the bottom wall 10 and to the outer radial periphery of the bottom wall 10. More precisely, the raised edge 12 s 'extends from the outer periphery of the bottom wall 10 and has an angle of inclination a, visible in Figure 3, between 30 ° and 60 °, with the extension plane A of the bottom wall 10. The raised edge 12 may comprise at least one chamfered corner 18, and in the example illustrated, the raised edge 12 has four chamfered corners 18. The parallelepipedal shape presented here is given only by way of example, and it is understood that the invention covers any form of magnetic shielding screen as long as the latter comprises a bottom, a raised edge and an internal portion which extends into the bowl delimited by the raised edge. The configuration of the internal portion 22 relative to the bottom wall 10 as well as its structure, and that of the raised edge 12 relative to the bottom wall 10 as well as its structure, make it possible to channel or capture the magnetic field towards or from the magnetic shielding screen 4. The raised edge 12 and the bottom wall 10 participate in partially delimiting an internal space 20. The internal space 20 corresponds to the space in which the magnetic field circulates and it is understood that this space internal 20 is open to the outside of the magnetic shielding screen 4. The internal portion 22 of the magnetic shielding screen 4 extends from the bottom wall 10, into the internal space 20 of the magnetic shielding screen. magnetic shielding 4, and at least partially defines a recess 24 in the magnetic shielding screen 4. The recess 24 is, in this first embodiment, a blind hole delimited by a cylinder 26 and a plate 28 perpendicular to a direction of revolution of cylinder 26 and say placed at one end of cylinder 26. In the example illustrated, cylinder 26 takes the form of a quadrilateral which extends in the internal space 20 of the magnetic shielding screen 4. More precisely, the cylinder 26 extends along a direction of cylinder C passing through an axis of revolution of cylinder 26 and sequent to the extension plane A of the bottom wall 10. Preferably, the direction of cylinder C is perpendicular to the plane d 'extension A of the bottom wall 10, but it is understood that alternatively the angle between the cylinder direction C and the extension plane A of the bottom wall 10 can be obtuse or acute. In other words, a section of the annular zone of the internal space 20 can take the form of a "V" which opens on either side of the bottom wall 10, but this section can also take the form of a "U" combined with a "V" as is the case with the representation of Figures 1 to 3. Finally, This section can still take the form of a "V" where one of the branches of the V is superimposed above of the back wall 10.
On définit par pied 14 du bord relevé, la jonction entre la paroi de fond 10 et le bord relevé 12. On entend aussi par extrémité distale 16, l’extrémité libre du bord relevé 12 opposée au pied de bord relevé 14, c’est-à-dire l’extrémité du bord relevé la plus éloignée de la paroi de fond 10. Le cylindre 26 comprend un pied 30 du cylindre et une extrémité 32 de cylindre. Le pied 30 du cylindre correspond à la jonction entre la paroi de fond 10 et le cylindre 26 et l’extrémité 32 du cylindre correspond à l’extrémité du cylindre 26 opposée au pied du cylindre 30 , c’est-à-dire la plus éloignée de la paroi de fond 10. The foot 14 of the raised edge is defined as the junction between the bottom wall 10 and the raised edge 12. The distal end 16 is also understood to mean the free end of the raised edge 12 opposite the raised edge foot 14, i.e. i.e. the end of the raised edge furthest from the bottom wall 10. The cylinder 26 includes a cylinder foot 30 and a cylinder end 32. The foot 30 of the cylinder corresponds to the junction between the bottom wall 10 and the cylinder 26 and the end 32 of the cylinder corresponds to the end of the cylinder 26 opposite the foot of the cylinder 30, that is to say the most away from the back wall 10.
Selon une caractéristique de l’invention, le bord relevé 12 s’étend sur une première hauteur H l, mesurée le long d’une droite perpendiculaire à la paroi de fond 10 entre le pied 14 du bord relevé et l’extrémité distale 16 du bord relevé. Le cylindre 26 s’étend sur une deuxième hauteur H2, mesurée le long d’une droite perpendiculaire à la paroi de fond 10 , entre le pied 30 du cylindre et l’extrémité 32 du cylindre. La première hauteur H l du bord relevé 12 est alors plus grande que la deuxième hauteur H2 du cylindre 26. On comprend ainsi que le cylindre 26 est contenu dans l’épaisseur de l’espace interne et ne s’étend pas en dehors de l’espace interne 20 de l’écran de blindage magnétique 4. According to one characteristic of the invention, the raised edge 12 extends over a first height H l, measured along a straight line perpendicular to the bottom wall 10 between the foot 14 of the raised edge and the distal end 16 of the raised edge. The cylinder 26 extends over a second height H2, measured along a straight line perpendicular to the bottom wall 10, between the foot 30 of the cylinder and the end 32 of the cylinder. The first height H l of the raised edge 12 is then greater than the second height H2 of the cylinder 26. It is thus understood that the cylinder 26 is contained within the thickness of the internal space and does not extend outside the 'internal space 20 of the magnetic shielding screen 4.
Selon une autre caractéristique de l’invention, le cylindre 26 est à une distance D I non nulle du bord relevé 12. La distance D I est alors mesurée le long de la paroi de fond 10 , entre le pied 30 du cylindre et le pied 14 du bord relevé. La zone entourée par le pied 30 du cylindre, la paroi de fond 10 et le pied 13 du bord relevé forme alors une zone de concentration 33 des lignes de champ magnétique émises ou reçues par la bobine 6. On entend par zone de concentration 33, une zone où on observe le plus d’activité magnétique sur l’écran de blindage magnétique 4. According to another characteristic of the invention, the cylinder 26 is at a non-zero distance DI from the raised edge 12. The distance DI is then measured along the bottom wall 10, between the foot 30 of the cylinder and the foot 14 of the cylinder. raised edge. The zone surrounded by the foot 30 of the cylinder, the bottom wall 10 and the foot 13 of the raised edge then forms a concentration zone 33 of the magnetic field lines emitted or received by the coil 6. The term “concentration zone 33” is understood to mean, an area where the most magnetic activity is observed on the magnetic shielding screen 4.
Selon le premier mode de réalisation de l’invention, la portion interne 22 comprend une plaque 28. L’évidement 24 de l’écran de blindage magnétique 4 est ainsi fermé par la plaque 28 , s’étendant au niveau de l’extrémité libre 32 du cylindre 26. La plaque 28 s’étend alors dans l’espace interne 20 de l’écran de blindage magnétique 4 et augmente la protection des usagers contre le champ magnétique généré ou reçu par la bobine 6, de par la propriété de perméabilité magnétique procurée par la ferrite. According to the first embodiment of the invention, the internal portion 22 comprises a plate 28. The recess 24 of the magnetic shielding screen 4 is thus closed by the plate 28, extending at the level of the free end. 32 of the cylinder 26. The plate 28 then extends into the internal space 20 of the magnetic shielding screen 4 and increases the protection of users against the magnetic field generated or received by the coil 6, by virtue of the property of permeability. magnetic provided by the ferrite.
Le cylindre 26 comprend une face radialement externe 34 en regard du bord relevé 12 et une face radialement interne 36 tournée vers l’évidement 24 et opposée à la face radialement externe 34. La bobine 6 est alors disposée contre la face radialement externe 34 du cylindre 26, de telle sorte qu’elle entoure ce dernier. On comprend donc que la bobine 6 est disposée dans l’espace interne 20 de l’écran de blindage magnétique 4. La bobine 6 peut alors être solidarisée à la face radialement externe 34 de le cylindre 26 par tout moyen offrant une fixation appropriée, par exemple par collage, vissage ou encore clipage. The cylinder 26 comprises a radially outer face 34 facing the raised edge 12 and a radially inner face 36 facing the recess 24 and opposite to the radially outer face 34. The coil 6 is then disposed against the radially outer face 34 of the cylinder 26, such that it surrounds the latter. It will therefore be understood that the coil 6 is disposed in the internal space 20 of the magnetic shielding screen 4. The coil 6 can then be secured to the radially outer face 34 of the cylinder 26 by any means offering suitable fixing, for example for example by gluing, screwing or clipping.
L’écran de blindage magnétique 4 tel qu’il vient d’être décrit, associé à la bobine 6 forme ce que l’on nommera par la suite le coupleur 8. Le coupleur 8 a par exemple pour fonction de générer un champ magnétique, au moyen de la bobine 6, l’écran de blindage magnétique 4 permettant alors de diriger le champ magnétique vers une zone déterminée située en face dudit coupleur 8 , de par sa propriété de perméabilité magnétique évoquée précédemment. The magnetic shielding screen 4 as just described, associated with the coil 6 forms what will be called the coupler 8 in the following. The function of the coupler 8 is for example to generate a magnetic field, by means of the coil 6, the magnetic shielding screen 4 then making it possible to direct the magnetic field towards a determined zone situated in front of said coupler 8, by virtue of its property of magnetic permeability mentioned above.
De manière alternative, le coupleur 8 peut avoir pour fonction de réceptionner un champ magnétique, au moyen de la bobine 6, l’écran de blindage magnétique 4 permettant alors d’optimiser la captation dudit champ magnétique en le concentrant vers la bobine 6 au moyen du bord relevé 12 et de la portion interne 22. Alternatively, the coupler 8 may have the function of receiving a magnetic field, by means of the coil 6, the magnetic shielding screen 4 then making it possible to optimize the capture of said magnetic field by concentrating it towards the coil 6 by means of the raised edge 12 and the internal portion 22.
Dans l’une ou l’autre de ces alternatives, on évite les dispersions du champ magnétique en périphérie du coupleur 8 et on diminue ainsi les pertes énergétiques et les risques pour les usagers se trouvant à proximité du coupleur 8 d’être impactés par le champ magnétique émis ou reçu. In either of these alternatives, the dispersions of the magnetic field at the periphery of the coupler 8 are avoided and the energy losses and the risks for users located near the coupler 8 of being impacted by the magnetic field emitted or received.
Un deuxième mode de réalisation de l’invention va maintenant être décrit avec la figure 4 illustrant une vue en perspective de l’écran de blindage magnétique 4 selon ce deuxième mode de réalisation. Il convient de considérer que dans la suite de la description, seules les caractéristiques du deuxième mode de réalisation différentes du premier mode de réalisation de l’écran de blindage magnétique 4 seront exposées. Pour les caractéristiques communes, il conviendra de se reporter aux figures 1 à 3 et leur description qui s’applique mutatis mutandis à la figure 4. Dans ce deuxième mode de réalisation, l’évidement 24 de l’écran de blindage magnétique 4 est délimité au moins par une ouverture traversante 38. Par ouverture traversante 38 , on comprend que l’évidement 24 bordée par le cylindre 26 communique avec l’espace interne 20 de l’écran de blindage magnétique 4. L’ouverture traversante 38 termine l’évidement 24 et c’est par cette ouverture traversante 38 que l’on passe de l’évidement 24 à l’espace interne 20 de l’écran de blindage magnétique 4. A second embodiment of the invention will now be described with FIG. 4 illustrating a perspective view of the magnetic shielding screen 4 according to this second embodiment. It should be considered that in the remainder of the description, only the characteristics of the second embodiment different from the first embodiment of the magnetic shielding screen 4 will be explained. For the common characteristics, reference should be made to Figures 1 to 3 and their description which applies mutatis mutandis to Figure 4. In this second embodiment, the recess 24 of the magnetic shielding screen 4 is delimited. at least by a through opening 38. By through opening 38, it is understood that the recess 24 bordered by the cylinder 26 communicates with the internal space 20 of the magnetic shielding screen 4. The through opening 38 completes the recess 24 and it is through this through opening 38 that one passes from the recess 24 to the internal space 20 of the magnetic shielding screen 4.
Une telle ouverture traversante 38 est possible par le fait que le champ magnétique est canalisé majoritairement entre le bord relevé 12 et le cylindre 26 de l’écran de blindage magnétique 4, dans la zone de concentration 33. On permet ainsi, une diminution du coût de production de l’écran de blindage magnétique 4 puisque l’évidement 24 de ce deuxième mode de réalisation de l’invention est dépourvu de matière. Such a through opening 38 is possible by the fact that the magnetic field is mainly channeled between the raised edge 12 and the cylinder 26 of the magnetic shielding screen 4, in the concentration zone 33. This allows a reduction in cost. production of the magnetic shielding screen 4 since the recess 24 of this second embodiment of the invention is devoid of material.
Le dispositif de charge sans contact 1 du véhicule automobile 2 va maintenant être décrit avec la figure 5 illustrant une vue schématique du dispositif de charge sans contact 1 selon l’invention. The contactless charging device 1 of the motor vehicle 2 will now be described with FIG. 5 showing a schematic view of the contactless charging device 1 according to the invention.
Le dispositif de charge sans contact 1 peut être utilisé pour le véhicule automobile 2 à traction électrique ou hybride, et comprend au moins deux coupleurs 8 selon les caractéristiques précédemment évoquées. On définit alors un coupleur primaire 40 et un coupleur secondaire 42. Le coupleur primaire 40 comprend un écran de blindage magnétique primaire 4a et une bobine primaire 6a, tandis que le coupleur secondaire 42 comprend un écran de blindage magnétique secondaire 4b et une bobine secondaire 6b. The contactless charging device 1 can be used for the motor vehicle 2 with electric or hybrid traction, and comprises at least two couplers 8 according to the characteristics mentioned above. A primary coupler 40 and a secondary coupler 42 are then defined. The primary coupler 40 comprises a primary magnetic shielding screen 4a and a primary coil 6a, while the secondary coupler 42 comprises a secondary magnetic shielding screen 4b and a secondary coil 6b. .
Le coupleur primaire 40 est disposé dans un support extérieur 44 au véhicule automobile 2, pouvant par exemple être une route ou une zone dédiée au stationnement du véhicule automobile 2, ou tout autre support apte à loger ledit coupleur primaire 40. Le coupleur secondaire 42 est lui disposé au sein du véhicule automobile 2, et plus précisément de telle sorte qu’il soit en regard du support extérieur 44 portant le coupleur primaire 40. De manière encore plus précise, le coupleur primaire 40 et le coupleur secondaire 42 sont disposés respectivement dans le support extérieur 44 et dans le véhicule automobile 2, de telle sorte qu’ils soient en regard l’un de l’autre, leurs axes médians verticaux étant par exemple confondus. The primary coupler 40 is arranged in a support 44 outside the motor vehicle 2, which may for example be a road or a zone dedicated to the parking of the motor vehicle 2, or any other support capable of accommodating said primary coupler 40. The secondary coupler 42 is it disposed within the motor vehicle 2, and more precisely so that it is facing the outer support 44 carrying the primary coupler 40. Even more precisely, the primary coupler 40 and the secondary coupler 42 are respectively arranged in the outer support 44 and in the motor vehicle 2, such that they are facing each other, their vertical median axes being for example the same.
La coupleur primaire 40 est connecté à une source d’énergie électrique externe 50 , par exemple un réseau électrique urbain, ou tout autre source d’énergie électrique permettant d’énergiser la bobine primaire 6a. On comprend alors que la bobine primaire 6a est la bobine émettrice d’énergie et qu’à contrario, la bobine secondaire 6b est la bobine réceptrice de l’énergie générée par la bobine primaire 6a. La bobine primaire 6a transfère de l’énergie électrique à la bobine secondaire 6b au moyen d’un champ magnétique. Plus précisément, la bobine primaire 6a émet un champ magnétique canalisé par l’écran de blindage magnétique primaire 4a, de telle sorte qu’il soit dirigé en direction du coupleur secondaire 42 disposé en regard du coupleur primaire 40. Additionnellement à l’écran de blindage magnétique primaire 4a, l’écran de blindage magnétique secondaire 4b canalise le champ magnétique émis par la bobine primaire 6a afin que celui- ci soit concentré vers la bobine secondaire 6b. On comprend alors que le transfert d’énergie de la bobine primaire 6a à la bobine secondaire 6b est un transfert d’énergie par induction et que l’écran de blindage magnétique primaire 4a et l’écran de blindage magnétique secondaire 4b optimisent ce transfert d’énergie en canalisant le champ magnétique entre les bobines primaire et secondaire 6a, 6b de par leur propriété de perméabilité magnétique et leur structure particulière. The primary coupler 40 is connected to an external electrical energy source 50, for example an urban electrical network, or any other energy source. electrical enabling the primary coil 6a to be energized. It is then understood that the primary coil 6a is the energy emitting coil and that, on the contrary, the secondary coil 6b is the receiving coil of the energy generated by the primary coil 6a. The primary coil 6a transfers electrical energy to the secondary coil 6b by means of a magnetic field. More precisely, the primary coil 6a emits a magnetic field channeled by the primary magnetic shielding screen 4a, so that it is directed in the direction of the secondary coupler 42 disposed opposite the primary coupler 40. Additionally to the screen of primary magnetic shielding 4a, the secondary magnetic shielding screen 4b channels the magnetic field emitted by the primary coil 6a so that it is concentrated towards the secondary coil 6b. It is then understood that the transfer of energy from the primary coil 6a to the secondary coil 6b is a transfer of energy by induction and that the primary magnetic shielding screen 4a and the secondary magnetic shielding screen 4b optimize this transfer d energy by channeling the magnetic field between the primary and secondary coils 6a, 6b by virtue of their property of magnetic permeability and their particular structure.
Du côté du véhicule automobile 2, le coupleur secondaire 42 est électriquement connecté par exemple à un dispositif de stockage électrique 52 du véhicule automobile 2 afin de le charger en énergie électrique, en provenance de la source d’énergie externe 50. On the side of the motor vehicle 2, the secondary coupler 42 is electrically connected for example to an electrical storage device 52 of the motor vehicle 2 in order to charge it with electrical energy, coming from the external energy source 50.
Le dispositif de charge sans contact 1 tel qu’il vient d’être décrit avec l’écran de blindage magnétique primaire 4a et l’écran de blindage magnétique secondaire 4b améliore le rendement du transfert d’énergie de la bobine primaire 6a à la bobine secondaire 6b. Également, le dispositif de charge sans contact 1 permet de réduire les émissions périphériques de champ magnétique pouvant impacter les usagers se trouvant à proximité du dispositif de charge sans contact 1. L’invention telle qu’elle vient d’être décrite, atteint bien les buts qu’elle s’était fixés et permet, par des moyens simples, d’optimiser la canalisation du champ magnétique du coupleur comprenant l’écran de blindage magnétique et la bobine, mais également de diminuer les risques pour les usagers en périphérie dudit coupleur, d’être impactés par le champ magnétique. The contactless charging device 1 as just described with the primary magnetic shielding screen 4a and the secondary magnetic shielding screen 4b improves the efficiency of energy transfer from the primary coil 6a to the coil. secondary 6b. Also, the contactless charging device 1 makes it possible to reduce the peripheral magnetic field emissions that may impact the users who are in the vicinity of the contactless charging device 1. The invention as it has just been described, does indeed achieve the goals. goals it had set itself and allows, by simple means, to optimize the channeling of the magnetic field of the coupler comprising the magnetic shielding screen and the coil, but also to reduce the risks for users on the periphery of said coupler, of being impacted by the magnetic field.
Il est à noter que les différentes variantes décrites ci-dessus peuvent être combinées ensemble afin de former de nouveau mode de réalisation . It should be noted that the different variants described above can be combined together in order to form a new embodiment.

Claims

REVBSI DI GATIONS REVBSI DI GATIONS
1. Ecran de blindage magnétique (4) pour un dispositif de charge sans contact ( 1) d’un véhicule automobile (2), qui comprend au moins une paroi de fond ( 10 ) et un bord relevé ( 12) s’étendant en périphérie externe de la paroi de fond ( 10 ), le bord relevé (12) et la paroi de fond ( 10) délimitant au moins partiellement un espace interne (20) destiné à recevoir au moins une bobine (6), l’écran de blindage magnétique (4) étant caractérisé en ce qu’il comprend au moins une portion interne (22) s’étendant depuis la paroi de fond ( 10 ) dans l’espace interne (20). 1. Magnetic shielding screen (4) for a contactless charging device (1) of a motor vehicle (2), which comprises at least a bottom wall (10) and a raised edge (12) extending in outer periphery of the bottom wall (10), the raised edge (12) and the bottom wall (10) at least partially delimiting an internal space (20) intended to receive at least one coil (6), the screen of magnetic shielding (4) being characterized in that it comprises at least one internal portion (22) extending from the bottom wall (10) into the internal space (20).
2. Ecran de blindage magnétique (4) selon la revendication précédente, dans lequel la portion interne (22) comprend au moins un cylindre (26) qui entoure un évidement (24) de l’écran de blindage magnétique (4). 2. Magnetic shielding screen (4) according to the preceding claim, wherein the internal portion (22) comprises at least one cylinder (26) which surrounds a recess (24) of the magnetic shielding screen (4).
3. Ecran de blindage magnétique (4) selon la revendication précédente, dans lequel le cylindre (26) de la portion interne (22) s’étend le long d’une direction de cylindre (C) sécante d’un plan d’extension (A) de la paroi de fond (10). 3. Magnetic shielding screen (4) according to the preceding claim, wherein the cylinder (26) of the internal portion (22) extends along a cylinder direction (C) intersecting an extension plane. (A) of the bottom wall (10).
4. Ecran de blindage magnétique (4) selon l’une quelconque des revendications 2 ou 3, dans lequel le cylindre (26) de la portion interne (22) est à une distance (D l) non nulle du bord relevé ( 12). 4. Magnetic shielding screen (4) according to any one of claims 2 or 3, wherein the cylinder (26) of the internal portion (22) is at a non-zero distance (D l) from the raised edge (12). .
5. Ecran de blindage magnétique (4) selon l’une quelconque des revendications 2 à 4, dans lequel le bord relevé ( 12) s’étend sur une première hauteur (H l) et la portion interne (22) s’étend sur une deuxième hauteur (H2), la première hauteur (H l) étant supérieure à la deuxième hauteur (H2). 5. Magnetic shielding screen (4) according to any one of claims 2 to 4, wherein the raised edge (12) extends over a first height (H l) and the internal portion (22) extends over a second height (H2), the first height (H l) being greater than the second height (H2).
6. Ecran de blindage magnétique (4) selon l’une quelconque des revendications 2 à 5, dans lequel l’évidement (24) est délimité au moins par une ouverture traversante (38 ) de l’écran de blindage magnétique 6. Magnetic shielding screen (4) according to any one of claims 2 to 5, wherein the recess (24) is delimited at least by a through opening (38) of the magnetic shielding screen
(4). (4).
7. Ecran de blindage magnétique (4) selon la revendication 2, dans lequel la portion interne (22) comprend une plaque (28 ) qui ferme l’évidement (24). 7. Magnetic shielding screen (4) according to claim 2, wherein the internal portion (22) comprises a plate (28) which closes the recess (24).
8. Ecran de blindage magnétique (4) selon la revendication précédente, dans lequel la plaque (28) s’étend depuis une extrémité libre (32) du cylindre (26). 8. Magnetic shielding screen (4) according to the preceding claim, wherein the plate (28) extends from a free end (32) of the cylinder (26).
9. Coupleur (8 ) d’un dispositif de charge sans contact ( 1) d’un véhicule automobile (2) comprenant au moins une bobine (6) logée dans un écran de blindage magnétique (4) selon l’une quelconque des revendications précédentes. 9. Coupler (8) of a contactless charging device (1) of a motor vehicle (2) comprising at least one coil (6) housed in a magnetic shielding screen (4) according to any one of claims previous ones.
10. Coupleur (8 ) selon la revendication précédente, dans lequel la bobine (6) entoure le cylindre (26). 10. Coupler (8) according to the preceding claim, wherein the coil (6) surrounds the cylinder (26).
11. Dispositif de charge sans contact ( 1) d’un véhicule automobile (2) à traction électrique ou hybride, composé d’au moins deux coupleurs (8 ) selon l’une quelconque des revendications 9 ou 10. 11. Contactless charging device (1) of a motor vehicle (2) with electric or hybrid traction, composed of at least two couplers (8) according to any one of claims 9 or 10.
12. Véhicule automobile (2) comprenant au moins un coupleur (8 ) selon l’une des revendications 9 ou 10. 12. Motor vehicle (2) comprising at least one coupler (8) according to one of claims 9 or 10.
PCT/FR2020/051311 2019-07-25 2020-07-20 Magnetic shield for a contactless charging device of a motor vehicle WO2021014087A1 (en)

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FR1908439A FR3099336B1 (en) 2019-07-25 2019-07-25 Magnetic shielding screen for a contactless charging device of a motor vehicle
FRFR1908439 2019-07-25

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015008547A (en) * 2011-10-28 2015-01-15 パナソニック株式会社 Non-contact power charger
US20160143194A1 (en) * 2013-07-02 2016-05-19 Yazaki Corporation Coil unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015008547A (en) * 2011-10-28 2015-01-15 パナソニック株式会社 Non-contact power charger
US20160143194A1 (en) * 2013-07-02 2016-05-19 Yazaki Corporation Coil unit

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FR3099336B1 (en) 2022-07-22

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