WO2023203016A1 - Magnetic coupling device and process for manufacturing such a magnetic coupling device - Google Patents

Abstract

The invention relates to a magnetic coupling device (1) for connecting to each other first and second circuits (2, 3). The magnetic coupling device (1) comprises: respective first and second sets (10, 20) of first and second coils (12a, 12b, 12c, 22a, 22b, 22c...). Each first and second coil (12a, 12b, 12c, 22a, 22b, 22c...) is provided in the form of an individual module (11a, 11b, 11c, 22a, 22b, 22c...). The first and second coils (12a, 12b, 12c...,22a, 22b, 22c...) are distributed along a curved closed line (30) with their winding axes extending along bisectors of said closed curved line (30), two successive first coils (12a, 12b, 12c...) along the closed curved line (30) being separated from each other by at least one second coil (22a, 22b, 22c...).

Description

Magnetic coupling device and method of manufacturing such a magnetic coupling device

Technical area

[0001] The invention relates to the field of connection by magnetic coupling of electrical circuits.

[0002] The subject of the invention is thus a magnetic coupling device and a method of manufacturing such a magnetic coupling device.

State of the prior art

[0003] It is known to connect electrical circuits by means of magnetic coupling devices in order to provide galvanic isolation between the two electrical circuits, provide impedance adaptation and possibly voltage adaptation.

[0004] Such a magnetic coupling device is generally based on the use of a first inductance, in the form of at least a first coil, connected to the first circuit, and a second inductance, in the form of at least a second coil, connected to the second circuit. The first and second inductances are arranged in such a way as to be magnetically coupled, usually, but not necessarily, by the use of a ferromagnetic material acting as a magnetic core between these two coils.

[0005] However, such magnetic coupling devices have the disadvantage of presenting either complicated maintenance due to a necessarily intimate arrangement between them and with the magnetic core, or of presenting energy transfer efficiency between the two electrical circuits weak linked to a magnetic coupling between the two weak inductances (this particularly in the case where there is no magnetic core). Presentation of the invention

[0006] The invention aims to remedy at least in part the above drawbacks and thus aims to provide a magnetic coupling device providing both good energy efficiency and easy maintenance.

[0007] To this end, the invention relates to a magnetic coupling device for connecting a first and a second circuit to each other, the magnetic coupling device comprising:

- a first set of first coils intended to be connected to the first circuit,

- a second set of second coils intended to be connected to the second circuit, each first coil being provided in the form of a first individual module having a winding axis, the second coils each being provided in the form of a second individual module having a winding axis, in which the first and second coils are distributed along a closed curved line with their winding axes extending along bisectors of said closed curved line, two first successive coils along the curved line closed being separated from each other by at least a second coil.

[0008] The magnetic coupling device further comprises:

- for each first coil, a first winding support around which said first coil is wound and for each second coil a second winding support around which said second coil is wound,

- at least a first base on which the first winding supports are mounted and at least a second base on which the second winding supports are mounted.

[0009] With such a magnetic coupling device, such an individual module arrangement of the first and second coils makes it possible to provide easy maintenance of the device, since it is easy to access each of the coils individually without necessarily needing to disassemble the other coils. Moreover, with such an arrangement along a closed curved line with the first coils separated from each other by at least a second coil makes it possible to have good magnetic coupling between the coils since they are arranged directly next to each other while limiting field leaks by this arrangement around a closed curved line. As a result, this “modular” aspect is not detrimental to energy transfer efficiency.

[0010] Furthermore, with such an arrangement, the magnetic confinement being ensured by the arrangement of the coils with respect to the closed line, it is not necessary to provide shielding even in the case where the device would be devoid of a magnetic core.

[0011] Similarly, such an arrangement with a first and a second base respectively supporting the first coils and the second coils, intervention on the primary circuit, i.e. that of the first coils, and/or on the secondary circuit, i.e. that of the second reels, is made easier.

[0012] Here and in the rest of this document, coil means a conductive wire wound so as to form a set of turns arranged close to each other. The winding of the wire is generally done around an axis which is called the winding axis and can be done on the basis of different shapes of turns, such as circular, square or hexagonal turns.

[0013] The invention also relates to a method of manufacturing a magnetic coupling device for connecting a first and a second circuit to each other, the method comprising the following steps:

- supply of a first set of first coils, each first coil being supplied in the form of an individual module having a winding axis,

- supply of a second set of second coils, each second coil being supplied in the form of an individual module having a winding axis,

- arrangement of the first and second coils distributed along a closed curved line with their winding axis extending along bisectors of said closed curved line, two first successive coils along the closed curved line being separated one on the other by at least a second coil, the first set first coils being intended to be connected to the first circuit, the second set of second coils being intended to be connected to the second circuit.

[0014] Such a method allows the manufacture of a magnetic coupling device according to the invention and to benefit, therefore, from the advantages associated with it and which have been explained above.

[0015] According to a possibility compatible with the invention, a galvanically isolated connector is perhaps provided intended to form with a first complementary connector a first electrical connection offering galvanic isolation, the galvanically isolated connector comprises a first set of first coils each having a winding axis and being distributed along a curved closed line with their winding axes extending along bisectors of said closed line, two first successive coils along said closed line having a space capable of accommodate a second coil of the at least one complementary connector. [0016] It will be noted that such a possibility of a connector with galvanic isolation makes it possible to provide a connector system presenting little risk of wear, even at high power since the energy transmission is carried out by induction. In addition, it is particularly secure since it provides galvanic isolation. Finally, this secure connection does not come at the expense of efficiency since the configuration of such a connector allows good magnetic coupling between the connector and the complementary connector.

According to this possibility compatible with the invention, the closed line can be an ellipse and is preferably a circle.

[0018] According to this same possibility, the turns of each first coil can extend in a predefined shape, for example in a “D” with the vertical part of the “D”, corresponding to a portion internal to the closed curved line, parallel to an axis of said closed curved line, and the curved part of the “D” corresponding to a portion of the turns exterior to the closed curved line.

According to this possibility compatible with the invention, the connector can be free of magnetic core. [0020] Such an absence of magnetic core is particularly advantageous in the context of the invention since with such an absence: there is no gap between different portions of magnetic core which would each be associated with a respective coil, thus avoiding the heating which would then take place at the level of these gaps and which would be necessary to cool, the center of each coil being free of magnetic core, such an absence of magnetic core can be used in the context of the integration of a cooling circuit of the device. Of course, taking into account the configuration used in the context of the invention, these advantages are not obtained to the detriment of the energy efficiency of the device.

[0021] According to this possibility compatible with the invention, the galvanically isolated connector can also be intended to form with a second complementary connector, and simultaneously with the first connection, a second electrical connection offering galvanic isolation, two first successive coils the along the closed line presenting a space capable of further housing a third coil of the second complementary connector.

This same possibility compatible with the invention concerns a set of galvanically isolated connectors intended for the formation of a first electrical connection, comprising:

- a first connector with galvanic isolation according to the possibility compatible with the invention,

- a second galvanically isolated connector according to the possibility compatible with the invention, the second connector thus comprising a set of second coils as a set of coils, the second galvanically isolated connector, complementary to the first galvanically isolated connector being said complementary connector, the second connector being arranged in such a way that when it is fitted into the first connector, each second coil is housed in a respective space presented by two successive first coils along said closed line Brief description of the drawings

[0023] The present invention will be better understood on reading the description of exemplary embodiments, given for purely indicative purposes and in no way limiting, with reference to the appended drawings in which: Figure 1 illustrates the principle of a device for magnetic coupling according to the principle of the invention, Figure 2 illustrates an example of practical implementation of a magnetic coupling device according to the invention, Figure 3 illustrates the arrangement as a first connector of a first assembly first coils of the magnetic coupling device illustrated in Figure 2, Figure 4 illustrates a first base of the first connector illustrated in Figure 3, said first base being configured to accommodate first individual modules each comprising a first respective coil Figures 5a to 5d illustrate a first individual module of a first set of coils illustrated in Figure 3, respectively in a front view, a first side view, a second side view and a three-quarter top view, the first module individual comprising a winding support and a first coil and Figures 5b, 5c and 5d respectively showing the stack of turns of the first coil at the level of a first internal portion of the latter, the spreading of the turns of the first coil at the level of a second external portion of the latter and the threaded rods equipping the winding support to allow its installation on the first base.

Identical, similar or equivalent parts of the different figures bear the same numerical references so as to facilitate the transition from one figure to another.

The different parts represented in the figures are not necessarily on a uniform scale, to make the figures more readable.

The different possibilities (variants and embodiments) must be understood as not being exclusive of each other and can be combined with each other. Detailed presentation of particular embodiments

[0027] Figure 1 illustrates the principle of a magnetic coupling device 1 according to the invention for connecting a first circuit 2, here a single-phase alternating power source, to a second circuit 3, here a device to be powered 3 shown in the form of a charge.

[0028] It will be noted that the invention aims in particular, and not exclusively, at the transfer of high-power electrical energy, whether of the pulsed (hence intermittent) or medium (i.e. continuously). It will be noted that in the context of such a transfer, the magnetic coupling device 1 according to the invention can also and optionally provide a transformation function and thus allow a rise or fall in voltage.

[0029] It will also be noted that in the configuration described in the context of the exemplary embodiment which will be described in connection with Figures 2 to 5c, the coupling device 1 allows a particularly efficient transfer of electrical energy even at high frequency, that is to say above 25 kHz, even 100 kHz and preferably of the order of 200 kHz.

Such a coupling device 1 according to the invention comprises:

- a first set 10 of first coils 12a, 12b, 12c... connected to the first circuit 2, here in parallel with each other,

- a second set 20 of second coils 22a, 22b, 22c... connected to the second circuit 3, here in parallel with each other.

Of course, if the first coils 12a, 12b, 12c... are connected to the first circuit parallel to each other and the second coils 22a, 22b, 22c... are connected to the second circuit parallel to each other , all types of connection are possible without departing from the scope of the invention. Thus, a configuration in which the first coils 12a, 12b, 12c... would be connected in series and the second coils 22a, 22b, 22c... in parallel, or even a hybrid configuration for one or both sets 10, 20 of coils 12a, 12b, 12c, 22a, 22b, 22c.... These different connection configurations of the first coils 12a, 12b, 12c... to the first circuit and the second coils 22a, 22b, 22c... are usual practices for those skilled in the art and they are able to move from one to the other.

[0032] As shown in Figure 1, each first coil 12a, 12b, 12c... is provided in the form of a first individual module 11a, 11b, 11c... presenting a winding axis of said first coil 12a, 12b, 12c..., the second coils 22a, 22b, 22c... each also being provided in the form of a second individual module 21a, 21b, 21c... having a winding axis of said second coil 22a, 22b, 22c....

The first and second coils 12a, 12b, 12c, 22a, 22b, 22c... are distributed along a closed curved line 30 with their winding axes extending along bisectors of said closed curved line 30, two first coils 12a, 12b, 12c... successively along the closed curved line 30 being separated from one another by at least one second coil 22a, 22b, 22c....

[0034] It will be noted that in the context of the present illustration of the principle of the invention provided by Figure 1, two first coils 12a, 12b, 12c... successive along the closed curved line 30 are separated one on the other by a single second coil 22a, 22b, 22c..., the device thus comprising as many first coils 12a, 12b, 12c... as second coils 22a, 22b, 22c...

[0035] As a variant not illustrated, in particular in the case where it is planned that the magnetic coupling device 1 can make it possible to connect the first circuit 2 to two second circuits 3, two first coils 12a, 12b, 12c... successively on along the closed curved line 30 can be perfectly separated by two second coils 22a, 22b, 22c..., one connected to one of the two second circuits 3, the other being connected to the other of the two second circuits 3.

The closed curved line 30 is preferably elliptical and is, in the context of the present principle of production and the exemplary embodiment which is described below, circular.

[0037] Thus with such a closed curved line 30 in the shape of a circle, the first and second coils 12a, 12b, 12c, 22a, 22b, 22c... are arranged in a toroidal configuration around the closed circular curved line 30. [0038] In the context of the present principle of the invention, each first and second coil 12a, 12b, 12c, 22a, 22b, 22c, etc. has a circular shape. Of course, the first and second coils 12a, 12b, 12c, 22a, 22b, 22c... can have other shapes without departing from the scope of the invention, as is discussed in particular below in link with an exemplary embodiment and Figures 5a to 5c.

[0039] Figure 2 illustrates the exemplary embodiment of a magnetic coupling device 1 according to the invention. In such a magnetic coupling device 1, each first individual module 11a, 11b, 11c, etc. comprises:

- a first winding support 14a, 14b, 14c... around which said first coil 12a, 12b, 12c... is wound,

- the first respective coil 12a, 12b, 12c....

In the same way, each second individual module 21a, 21b, 21c... comprises:

- a second winding support 24a, 24b, 24c... around which said second coil 22a, 22b, 22c... is wound,

- the second respective coil 22a, 22b, 22c....

[0040] The magnetic coupling device 1 further comprises a first base 15, illustrated in Figure 4, on which the first individual modules lia, 11b, 11c, etc. are mounted. In a particularly advantageous manner, the first individual modules lia, 11b, 11c... are mounted on the base 15 in a removable manner. Such a removable assembly can in particular be produced by complementarity of shape, by means of screws and nuts, by elastic interlocking or by any other assembly system accessible to those skilled in the art.

It can be seen in Figure 4 that in the context of this exemplary embodiment, the first base 15 has a disk shape and comprises 10 locations 155 distributed circumferentially equidistant from each other. Each location 155 is configured to receive a respective first individual module lia, 11b, 11c... and has three nuts 151 and two passages 152 in order to connect the first module lia, 11b, 11c... corresponding to a circuit cooling. The base 15 also has 10 complementary locations 156 each arranged to receive a second respective individual module 21a, 21b, 21c... and has for this purpose an opening 153 intended to cooperate with said second individual module 21a, 21b, 21c... [0042] The second base 25 has an identical configuration, or symmetrical with respect to a median plane, to that of the first base 15 with the difference that the locations, not referenced, are adapted to receive the second individual modules 21a, 21b, 21c... and that the complementary locations, not referenced, are each arranged to receive a first individual module lia, 11b, 11c... respective. [0043] Figures 5a to 5d illustrate the configuration of a first individual module 11a, 11b, 11c according to this first embodiment. It can be seen in these figures that the first winding support 14a comprises:

- a foot 141 capable of being mounted on the first base and having three threaded orifices, not referenced, to allow mounting on the first base 15 from threaded rods 146 which are targeted there, and the three nuts 151 of the base 15 shown in Figure 4,

- an upright 142 extending from the foot and having a winding footprint 143, capable of receiving the corresponding first coil 12a and giving it its shape when it is wound around said footprint, and a wire passage 145 to allow a passage of the wires forming the coil 12a to allow connection to the first circuit.

[0044] Furthermore, the foot 141 and the amount 142 of each first support 14a, 14b, 14c... include a heat transfer liquid circuit, of which only the input and output connectors 144a, 144b are shown, in order to allow the cooling of the corresponding first coil 12a, 12b, 12c.... Such a heat transfer liquid circuit forms a heat dissipation system.

[0045] It will be noted that such a heat transfer liquid circuit is an example of a particularly advantageous heat dissipation system in the context of the present embodiment of the invention. Of course other types of heat dissipation system than a heat transfer liquid circuit are possible without departing from the scope of the invention. The system can thus, for example, include, instead of the circuit of heat transfer liquid, a metal heatsink/radiator with fins possibly coupled to a fan.

According to this exemplary embodiment, such a heat transfer liquid circuit is intended to be connected to a water cooling system, the water of said circuit then forming the heat transfer liquid. To allow such a connection, the heat transfer liquid circuit can include the input and output connectors 144a, 144b passing through the two passages 152 of the first base 15, as illustrated in Figure 4.

As indicated above, the impression is shaped to give the shape to the first coil 12a when it is wound on the winding support 14a. It can thus be seen in Figures 5a to 5c that the winding pattern 143 of each first support 14a is arranged so that during winding, the first coil 12a which is wound there comprises a plurality of turns 13, said turns 13 being arranged with, on a first portion 13a internal to the closed curved line 30, a stack of turns 13 in a direction substantially perpendicular to the bisector of the closed curved line 30, and on a second portion 13b external to the closed line, a spread of turns 13 along the closed curved line 30.

[0048] With such an arrangement, the part of the turns included in the first internal portion 13a allows optimized magnetic coupling while the part of the turns 13 included in the second external portion 13b participates in the confinement of the magnetic field. As a result and in order to optimize the transfer and confinement of the magnetic field, the turns 13 of each first coil 12a, 12b, 12c, etc. can:

- extend over the first portion 13a in a direction substantially perpendicular to a plane of the closed curved line 30, and

- extend, on their second portion 13b and advantageously, along a curved line, preferably in an arc of a circle, around the closed curved line. [0049] Thus the turns 13 of each of the first coils 12a, 12b, 12c... can have a "D" shape with the vertical part of the "D," corresponding to the first internal portion 13a, parallel to an axis of the closed curved line 30 (here at the axis of the circle), and the curved part of the D corresponding to the first exterior portion 13b of the turns 13. With such a configuration, a particularly optimized transfer is obtained with a arrangement of the particularly compact magnetic coupling device 1. We can in fact see in Figure 2 that the first and second coils 12a, 12b, 12c, 22a, 22b, 22c... are arranged in a spherical shape. In such a configuration, the first internal portions 13a of the first coils 12a, 12b, 12c... and the second internal portions, not referenced, of the second coils 22a, 22b, 22c... extend along an axis of said sphere, and the first external portions 13a of the first coils 12a, 12b, 12c... and the second external portions, not referenced, of the second coils 22a, 22b, 22c... define the circumference of said sphere.

[0050] In order to optimize energy transfer, the first coils 12a, 12b, 12c..., like the second coils 22a, 22b, 22c... can be wound with a litz wire whose configuration is adapted to the electrical energy transfer conditions envisaged between the first and second circuits 2, 3 and in particular the voltage modulation frequency used in the context of this transfer.

[0051] The second individual modules 21a, 21b, 21c... therefore each comprising a second winding support 24a, 24b, 24c and a second coil 22a, 22b, 22c..., for the same reasons as the first individual modules lia, 11b, 11c... and to optimize the magnetic coupling between the first and second coils 12a, 12b, 12c, 22a, 22b, 22c..., have a shape similar to that of the first individual modules lia, 11b, lie ....

[0052] Thus and in particular, in the context of the present exemplary embodiment, the turns of each of the second coils 22a, 22b, 22c... can have a "D" shape with the vertical part of the "D," corresponding to the internal portion, parallel to an axis of the closed curved line 30 (here to the axis of the circle), and the curved part of the D corresponding to the external portion of the turns 13.

[0053] It will be noted that in the context of the present exemplary embodiment, the first set 10 of first coils 12a, 12b, 12c... and the second set 20 of second coils 22a, 22b, 22c... are arranged nested 'one in the other. In this way, according to an advantageous possibility compatible with the invention, the first set 10 of first coils 12a, 12b, 12c... forms a first connector and the second set 20 of second coils 22a, 22b, 22c... forms a second connector capable of being fitted into the first connector.

[0054] It is therefore possible, in the context of the invention and this possibility compatible with the invention, that a magnetic coupling device is supplied in two parts. According to this possibility, the first part, comprising the first set 10 of first coils 12a, 12b, 12c..., can be arranged in a charging location, such as a warehouse or a parking area for a vehicle to be recharged, and the second set 20 of second coils 22a, 22b, 22c... can equip the vehicle to be recharged. In such a configuration, the first assembly 10 is connected to a recharging circuit and the vehicle to be recharged is an electrically powered vehicle, such as an electric car, an aerial or underwater drone, or even an aircraft.

[0055] Thus, when parking such a vehicle, the second assembly 20 can be fitted into the first assembly 10 so as to allow magnetic coupling between the first coils 12a, 12b, 12c, etc. and the second coils 22a , 22b, 22c... It will be noted that as shown in Figure 4, in order to facilitate such placement of the second set 20 nested in the first set 10, the first set 10 and/or the second set 20 may comprise a system d helps with alignment. As shown in Figure 4, in the context of this exemplary embodiment, the alignment assistance system is provided by a conformation of the first and second base 15, 25. In fact, the first and second base 15, 25 both include alignment stops 154 and openings 153 intended to cooperate with the individual modules 21a, 21b, 21c... of the other assembly 20, 10.

The present magnetic coupling device 1 according to the invention can be manufactured using a manufacturing process comprising the following steps:

- supply of a first set 10 of first coils 12a, 12b, 12c..., each first coil 12a, 12b, 12c... being supplied in the form of an individual module having a winding axis, - supply of a second set 20 of second coils 22a, 22b,

22c..., each second coil 22a, 22b, 22c... being supplied in the form of an individual module having a winding axis,

- arrangement of the first and second coils 12a, 12b, 12c, 22a, 22b, 22c... distributed along a closed curved line 30 with their winding axes extending along bisectors of said closed curved line 30, two first coils 12a, 12b, 12c... successive along the closed curved line 30 being separated from one another by at least one second coil 22a, 22b, 22c..., the first set 10 of first coils 12a, 12b, 12c... being intended to be connected to the first circuit 2, the second set 20 of second coils 22a, 22b, 22c... being intended to be connected to the second circuit 3.

[0057] It will be noted that, according to the present exemplary embodiment, in the case where the first and second sets 10, 20 respectively form a connector and a complementary connector, the arrangement can be done in three steps:

- arrangement of the first coils 12a, 12b, 12c... distributed along a closed curved line 30 with their winding axes extending along bisectors of said closed curved line 30, two first coils 12a, 12b, 12c. .. successive along the closed curved line 30 being separated from each other by a space intended to receive at least one second coil 22a, 22b, 22c..., said first coils 12a, 12b, 12c.. forming a first set 10 of first coils 12a, 12b, 12c...,

- arrangement of second coils 22a, 22b, 22c... distributed along a closed curved line 30 with their winding axes extending along bisectors of said closed curved line 30, each second coil 22a, 22b, 22c. .. being arranged along the closed curved line 30 in such a way as to be accommodated in a space separating two first coils 12a, 12b, 12c..., said second coils 22a, 22b, 22c... forming a second set 20 second coils 22a, 22b, 22c...,

- connection of the first and the second set to respectively the first and the second circuit 2, 3 so as to form the magnetic coupling device 1 connecting a first and a second circuit 2, 3 to each other. Of course, if in the embodiment described above, a first base is provided on which the first coils are mounted, and a second base on which the second coils are mounted, it is also possible, without having to outside the scope of the invention, to provide two or more first bases and/or two or more second bases respectively supporting the first and second coils without departing from the scope of the invention.

Claims

Claims 1. Magnetic coupling device (1) for connecting a first and a second circuit (2, 3) to each other, the magnetic coupling device (1) comprising: a first set (10) of first coils ( 12a, 12b, 12c...) intended to be connected to the first circuit (2), a second set (20) of second coils (22a, 22b, 22c...) intended to be connected to the second circuit (3), the magnetic coupling device (1) being characterized in that each first coil (12a, 12b, 12c...) is provided in the form of a first individual module (11a, 11b, 11c...) having an axis of winding, the second coils (22a, 22b, 22c...) each also being provided in the form of a second individual module (21a, 21b, 21c...) having a winding axis, in which the first and second coils (12a, 12b, 12c..., 22a, 22b, 22c...) are distributed along a closed curved line (30) with their winding axes extending along bisectors of said closed curved line ( 30), two first coils (12a, 12b, 12c...) successive along the closed curved line (30) being separated from each other by at least one second coil (22a, 22b, 22c.. .), in which the magnetic coupling device further comprises: - for each first coil (12a, 12b, 12c...) a first winding support (14a, 14b, 14c...) around which said first coil (12a, 12b, 12c...) is wound and for each second coil (22a, 22b, 22c) a second winding support (24a, 24b, 24c...) around which said second coil (22a, 22b, 22c...) is wound, - at least a first base (15) on which the first winding supports (14a, 14b, 14c...) are mounted and at least a second base (25) on which the second winding supports (24a, 24b) are mounted , 24c...). 2. Magnetic coupling device (1) according to claim 1, wherein the closed line (30) is an ellipse and is preferably a circle. 3. Magnetic coupling device (1) according to claim 1 or 2, wherein the first and second coils (12a, 12b, 12c..., 22a, 22b, 22c...) each comprise a plurality of turns (13), the turns (13) of each first coil (12a, 12b, 12c...) being arranged with, on a first internal portion (13a) at the closed curved line (30), a stack of turns (13). ) in a direction substantially perpendicular to the bisector of the closed curved line (30), and on a first portion external (13b) to the closed line, a spread of turns (13) along the closed curved line (30), the turns (13) of each second coil (22a, 22b, 22c...) being arranged with, on a second portion internal to the closed curved line (30), a stack of turns (13) in a direction substantially perpendicular to the bisector of the closed curved line (30), and on a second portion (13b) external to the closed curved line (30), a spreading of turns along the closed curved line (30). 4. Magnetic coupling device (1) according to claim 3, in which the turns (13) of each first coil (12a, 12b, 12c...) extend over the first portion (13a) in a substantially perpendicular direction at a plane of the closed curved line (30), the turns (13) of each second coil (22a, 22b, 22c...) extend over the second portion (13b) in the direction substantially perpendicular to the plane of the closed curved line (30), in which the turns (13) of each first and second coil extend, on their second portion (13b) and advantageously, along a curved line, preferably in an arc of a circle, around the closed curved line. 5. Magnetic coupling device (1) according to any one of claims 1 to 4 in which at least part of the first winding supports (14a, 14b, 14c...) comprise a heat dissipation system, the system of heat dissipation preferably comprising a heat transfer fluid circuit. 6. Magnetic coupling device (1) according to any one of claims 1 to 5, in which the second set (20) of second coils (22a, 22b, 22c...) is arranged nested with the first set (10). ) of coils (12a, 12b, 12c...) in a removable manner. 7. Magnetic coupling device (1) according to any one of claims 1 to 6, wherein the magnetic coupling device (1) does not have a magnetic core. 8. Method for manufacturing a magnetic coupling device (1) for connecting a first and a second circuit (2, 3) to each other, the method comprising the following steps: providing a first assembly ( 10) first coils (12a, 12b, 12c...), each first coil (12a, 12b, 12c...) being supplied in the form of an individual module having a winding axis, during this supply of first coils, there is provided for each first coil (12a, 12b, 12c...) a first winding support (14a, 14b, 14c...) around which said first coil (12a, 12b, 12c...) is wound. ), provision of a second set (20) of second coils (22a, 22b, 22c...), each second coil (22a, 22b, 22c...) being provided in the form of an individual module having an axis winding, during this supply of second coils, there is provided for each second coil (22a, 22b, 22c) a second winding support (24a, 24b, 24c...) around which said second coil (22a) is wound , 22b, 22c...), arrangement of the first and second coils (12a, 12b, 12c..., 22a, 22b, 22c...) distributed along a curved closed line (30) with their winding axes extending along bisectors of said closed curved line (30), two first coils (12a, 12b, 12c...) successive along the closed curved line (30) being separated from each other by at least one second coil (22a, 22b, 22c...), the first set (10) of first coils (12a, 12b, 12c...) being intended to be connected to the first circuit (2), the second set (20) of second coils (22a , 22b, 22c...) being intended to be connected to the second circuit (3), this arrangement of the first and second coils (12a, 12b, 12c..., 22a, 22b, 22c...) being made from at least a first base (15) on which the first winding supports (14a, 14b, 14c...) are mounted and from at least a second base (25) on which the second winding supports are mounted (24a, 24b, 24c...).