Three-phase transformer for isolated voltage converter
Patent Information
- Application Number
- EP2023817054
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-12-08
- Filing Date
- 2023-11-28
- Publication Date
- 2025-10-15
AI Technical Summary
Existing three-phase transformers for isolated voltage converters face challenges in heat dissipation and copper losses, particularly in high-power applications like vehicle electrical energy storage units with nominal voltages greater than 60V, such as 300V, 400V, 800V, or 1000V, where efficient cooling and reduced copper losses are essential.
The design incorporates a support structure with ribs extending from a wall around the electrical windings, increasing the distance between the windings and the magnetic circuit, allowing for thermally conductive resin to occupy the gap and enhance cooling, while maintaining inductive coupling between the windings. This support structure can be made in one piece from materials like polybutylene terephthalate (PBT) or polyamide (PA), and the ribs can be evenly distributed around the wall, extending continuously or discontinuously along the axis.
This configuration reduces copper losses and improves heat dissipation by creating space for thermally conductive resin, effectively cooling the magnetic circuit and balancing electrical parameters like inductances, thus enhancing the performance of the three-phase transformer.
Smart Images
Figure 1.1
Abstract
Description
[0001] Description
[0002] THREE-PHASE TRANSFORMER FOR ISOLATED VOLTAGE CONVERTER
[0003] The present invention relates to an electronic component comprising a magnetic circuit, and at least two electrical conductors each having a portion arranged around the same part of the magnetic circuit, each of said portions forming between a first and a second end a winding, these two windings being in inductively coupled with each other via the magnetic circuit.
[0004] Such an electronic component defines for example a three-phase transformer for an isolated voltage converter, such a voltage converter being for example integrated into a component for the electrical supply of a vehicle electrical energy storage unit, also called a "charger" of this electrical energy storage unit. The electrical energy storage unit is for example a battery, which may have a nominal voltage greater than 60V, for example greater than or equal to 300V, 400V, 800V, or even 1000V. The voltage converter receives for example an alternating voltage from an electrical network and supplies the battery with a direct voltage. This converter can carry a power greater than 5kW, for example greater than 7kW, for example greater than 11kW, in particular 22kW or more.
[0005] The electronic component comprises, in a known manner:
[0006] - a magnetic circuit,
[0007] - two electrical conductors each having a portion arranged around the same part of the magnetic circuit, each of said portions forming a winding between a first and a second end, these two windings being in inductively coupled with each other via the magnetic circuit, and
[0008] - a support for the two electrical windings, arranged between said electrical conductors and said portion of the magnetic circuit.
[0009] There is a need to improve heat dissipation in the magnetic circuit and reduce copper losses in such a component.
[0010] The invention aims to meet this need and achieves this, according to one of its aspects, using an electronic component, comprising:
[0011] - a magnetic circuit,
[0012] - two electrical conductors each having a portion arranged around the same part of the magnetic circuit, each of said portions forming a winding between a first and a second end, these two windings being in inductively coupled with each other via the magnetic circuit, and
[0013] - a support for the two electrical windings, arranged between said electrical conductors and said portion of the magnetic circuit, characterized in that the support comprises:
[0014] - a wall around which the electrical windings are arranged, and
[0015] - at least two ribs extending away from the wall towards the portion of the magnetic circuit.
[0016] The presence of the ribs allows the electrical windings to be further separated from the portion of the magnetic circuit around which they are arranged, thus reducing copper losses in the electronic component. Furthermore, the presence of these ribs also allows an empty space to be created between this portion of the magnetic circuit and the support in the areas without ribs, a space occupied by a thermally conductive resin, which promotes the cooling of the magnetic circuit.
[0017] The support comprises, for example, four, or six, or eight ribs, each extending away from the wall in the direction of the portion of the magnetic circuit. The invention is however not limited to a particular number of ribs.
[0018] Each rib can have the same shape. As will be seen later, the support wall can define a hollow cylinder with a circular cross-section. In this case, each rib can extend radially, that is, along a radius of this cylinder, in a plane perpendicular to its axis.
[0019] The ribs can be distributed evenly as they move around the support wall. In other words, as you move around the wall, the distance between two successive ribs can remain constant.
[0020] The support may comprise three flanges offset along the longitudinal axis of the support, such that one of the electrical windings is disposed between the first and second flanges and the other of the electrical windings is disposed between the second and third flanges. In other words, the two electrical windings carried by a support of electrical conductors may follow one another along this support, without overlapping along planes perpendicular to the longitudinal axis of this support.
[0021] All or part of the ribs may extend continuously along the axis of the support from the first rim to the third rim. Alternatively, all or part of the ribs extend discontinuously along the axis of the support from the first rim to the third rim.
[0022] All or part of the ribs may extend to the portion of the magnetic circuit in contact with this portion. In other words, in this case, the radial space existing between the wall and the magnetic circuit is locally completely filled by the rib. Alternatively, a radial clearance may remain between the rib and the magnetic circuit.
[0023] In all of the above, the wall around which the electrical windings are arranged can define a hollow cylinder of circular section.
[0024] For the purposes of this application:
[0025] - “axially” means along the axis of the wall around which the electrical windings are arranged,
[0026] - “angularly” means moving around this axis, and
[0027] - “radially” means: in a plane perpendicular to this axis, along a straight line intersecting this axis when this wall defines a hollow cylinder of circular cross-section.
[0028] Each electrical conductor is, for example, made of Litz wire.
[0029] In all of the above, the support may be made from a single piece, for example being made from plastic such as polybutylene terephthalate (PBT), or polyamide (PA).
[0030] In all the above, the electronic component can define a transformer for an isolated voltage converter.
[0031] In all of the above, no cooling chamber using a liquid is, for example, interposed between the electrical windings and the portion of the magnetic circuit on which the support is arranged.
[0032] The transformer is for example a three-phase transformer for an isolated voltage converter, comprising three supports of electrical conductors, each support being arranged around a part of the magnetic circuit and carrying two windings in inductive coupling with each other via the magnetic circuit, the supports defining in particular a geometric pattern being an equilateral triangle.
[0033] Each support thus carries two windings in inductive coupling with each other, together defining a phase of the three-phase transformer.
[0034] The arrangement of the three electrical conductor supports in an equilateral triangle can ensure a balance between electrical parameters such as the inductances of the electrical windings and reduce the magnetic volume.
[0035] The magnetic circuit can be made up of two parts, each part defining a base carrying pins, two by two superimposed when these two parts are assembled, and the superposition of two pads defines the part of the magnetic circuit on which a support of two electrical conductors is mounted. The invention also relates, according to another of its aspects, to a component for the electrical power supply of a vehicle electrical energy storage unit, comprising the transformer defined above. The electrical energy storage unit is for example a battery which can have one of the nominal voltages above.
[0036] The invention may be better understood by reading the following description of non-limiting examples of its implementation:
[0037] - [Fig.l] schematically represents part of the electrical circuit of a component for the electrical power supply of a vehicle electrical energy storage unit
[0038] - [Fig.2] shows in elevation an example of a three-phase transformer which can be used in the circuit of figure 1,
[0039] - [Fig.3] represents in isolation the magnetic circuit of the three-phase transformer of figure 2,
[0040] - [Fig.4] partially represents the three-phase transformer of figures 2 and 3 when the housing cover is removed
[0041] - [Fig.5] shows a detail of an example of a system for holding the transformer housing cover on the support,
[0042] - [Fig.6] represents the cover of the housing of figure 4,
[0043] - [Fig.7] represents in isolation the body of the terminal block visible in figure 2,
[0044] - [Fig.8] represents the body of figure 7 in which inserts are arranged,
[0045] - [Fig.9] represents the terminal block of figures 7 and 8 with electrically conductive bar and screws,
[0046] - [Fig.10] represents the face of the transformer opposite to that shown in figure 4,
[0047] - [Fig.11] is a view of the transformer electrical conductor support from the same side as Fig.10, and shows the support holding system on the magnetic circuit and the support holding system on the transformer housing body carried by this support
[0048] - [Fig.12] represents the body of the transformer housing on which the electrical conductor support of figure 11 is held,
[0049] - [Fig.13] is a view similar to Figure 11 and also shows ribs allowing the distance of this support from the portion of the magnetic circuit on which it is mounted,
[0050] - [Fig.14], [Fig.15] and [Fig.16] are views similar to that of figure 13, when the electrical conductor support is mounted on the portion of the magnetic circuit,
[0051] - [Fig.17] is a side sectional view of Figure 16,
[0052] - [Fig.18] represents three supports for electrical conductors of the transformer and their electrical conductors, in the absence of the magnetic circuit, - [Fig.19] represents in isolation one of the three supports for electrical conductors of figure 18 with its electrical conductors, and
[0053] - [Fig.20] represents the electrical conductor support of figure 19 without its electrical conductors.
[0054] Figure 1 shows a part of the electrical circuit 1 of a component for the electrical power supply of a vehicle electrical energy storage unit. This component is also called a “charger”. The electrical energy storage unit, not shown in this figure 1, is for example a battery, which may have a nominal voltage greater than 60V, for example greater than or equal to 300V, 400V, 800V, or even 1000V.
[0055] The circuit 10 receives as input an alternating voltage from a network (not shown) which is three-phase here. A rectifier for converting this alternating voltage into a direct voltage, and also performing a power factor correction function (power factor correction in English) if necessary, is arranged upstream of a direct bus 11. Downstream of this direct bus, from the electrical network, is arranged an isolated voltage converter 12, here being a DC / DC. This converter 12 comprises, in a known manner, an inverter 14, a three-phase transformer 15, and a rectifier 16 supplying the vehicle with a direct voltage isolated from the electrical network. As can be seen in FIG. 1, the three-phase transformer 15 is connected to each of the rectifier 16 and the inverter 14 by an inductor block 17 and a capacitor block 18, so as to define a CLLLC structure.Other structures are of course possible, such as an LLC, CLLC, LC or even CL structure.
[0056] As can be seen in Figure 1, each phase has a primary winding 20 and a secondary winding 21 in inductive coupling with each other, and the primary windings 20 are connected in star and the secondary windings 21 are also connected in star.
[0057] The three-phase transformer 15 comprises in the example considered a magnetic circuit 22, comprising a first part 23 and a second part 24. Each part 23, 24 comprises: a base 26 of substantially triangular outline, and three pads 27 each extending in the direction of the base 26 of the other part of the magnetic circuit 22. Each base 26 here has an outline defining an equilateral triangle.
[0058] The transformer 15 further comprises three supports 30 of electrical conductors 31, 32, each support 30 being here mounted on two facing pads 27 belonging respectively to one and the other of the parts 23, 24 of the magnetic circuit. Two electrical conductors 31, 32 associated with the same support 30 respectively have a portion defining a primary winding 20 and a portion defining a secondary winding 21. These electrical conductors 31, 32 are for example Litz wire.
[0059] As can be seen in Figure 2, the three supports 30 of electrical conductors 31, 32 are positioned so as to define an equilateral triangle.
[0060] The transformer 15 also comprises a housing 50 comprising a body 51 closed by a cover 52, which are visible in FIGS. 4 and 6. This body 51 and this cover 52 are for example made of metal, for example aluminum. The supports 30 and the magnetic circuit 22 are arranged inside the housing 50. The body 51 is filled with a resin capable of being polymerized to harden and immobilize the components arranged inside the body (“potting” in English).
[0061] As can be seen in Figures 4 and 6, the housing 50 also has a triangular outline, being more precisely here an equilateral triangle. The housing is in the example considered exclusively formed by the body 51 and the cover 52, but the invention is not limited to a housing 50 consisting of two parts.
[0062] As can be seen in Figure 3, each pad 27 defines its own air gap 28, for example via an area of the pad 27 filled with non-magnetic material such as a fiberglass-reinforced epoxy resin composite (FR4) or ceramic. This area occupied by this non-magnetic material defines, for example, an entire slice of the pad. Several sections are, for example, assembled with this area of the pad 27 to constitute this pad 27.
[0063] As can be seen in Figure 3, an additional air gap 29 is present between the opposite ends of two pads 27 belonging respectively to different parts 23, 24 of the magnetic circuit 22. Thus, in the example of magnetic circuit 22 considered, each magnetic field allowing inductive coupling between a primary winding 20 and a secondary winding 21 crosses exactly three air gaps.
[0064] Still in Figure 3, it can be seen that the magnetic circuit 22 of the example considered comprises a central leg 40 carried by one of the parts 23, 24 of the magnetic circuit 22. This central leg 40 is here made in a single piece with the part 23 of the magnetic circuit 22 which carries it.
[0065] It can be seen in Figure 3 that the central leg 40 extends in this example continuously between two ends each being in contact with one of the bases 26 of the magnetic circuit 22, so that no air gap is provided in the central leg 40.
[0066] It can also be seen in Figure 3 or in Figure 16 that the central leg 40 has a core 41 and three protrusions 42 extending from this core 41, each protrusion 42 extending between two neighboring pads 27 carried by the same part of the magnetic circuit.
[0067] As can be seen in Figure 3, in the example considered, each pad 27 has a circular outer contour, and each protrusion 42 of the central leg 40 here has a wall opposite the pads 27 of rounded shape.
[0068] As can be seen in Figure 2, the three-phase transformer 15 comprises a connection terminal block 45. This connection terminal block 45 is fixed to one side of the housing 50 of the three-phase transformer 15. As can be seen in Figure 2, the terminal block 45 here defines six terminals 60 for the connection of the three-phase transformer 15 to the rest of the electrical circuit 10, these terminals 60 being shown schematically in Figure 1. These terminals 60 here come into contact with electrical tracks of an electronic card not shown.
[0069] The connection terminal block 45 has, as can be seen in FIG. 2, an elongated shape, and the six terminals 60 are here arranged in a row.
[0070] The various elements of the terminal block 45 according to the embodiment shown will now be described with reference to figures 7 to 9
[0071] The terminal block 45 here comprises a body 61 and a plurality of electrically conductive bars 62, each terminal 60 being defined by a portion 63 of a bar. Each portion 63 is here flat, so as to come into contact with an electrical track of the electronic card mentioned above. The body 61 can be made of plastic, for example PBT, PA, etc.
[0072] Each electrically conductive bar 62 has, for example, a portion 65, opposite the portion 63 defining the terminal, which is electrically connected to one of the electrical conductors 31, 32, here via a hollow sleeve 66 inside which the conductor 31, 32 is inserted, for example fixed by crimping or welding.
[0073] Each electrically conductive bar 62 locally comprises a hole 67 and the fixing of this electrically conductive bar 62 on the body 61 is carried out by means of a screw 68 received in this hole 67. The body 61 here comprises six housings 69, and each of these housings receives an insert 70 forming a hole 71, the aforementioned screw 68 being received in an insert hole 71. Thus, the fixing of the electrically conductive bar 62 on the body 61 is carried out via the screw 68 and the insert 70 received in the housing 69. Each insert 70 can be made of metal, in particular steel. Alternatively, each insert is made of composite material. Six inserts are for example provided, and all these inserts 70 have in the example considered the same shape and the same dimensions. Each screw 68 can, in addition to ensuring the fixing of an electrically conductive bar 62 on the body 61, also ensure the fixing of the electrically conductive bar 62 on the electronic card not shown.
[0074] As can be seen in Figure 8, each insert 70 can define a positioning relief 73 of the portion 63 of the electrically conductive bar defining the hole 67. This positioning relief 73 is for example a circular-shaped flat.
[0075] As can be seen in Figures 2, 7 and 8, the outer wall of each housing 69 can provide a recess 75 capable of receiving an end portion 64 of the electrically conductive bar 62, in order to ensure correct positioning of this bar on the body 61 and to avoid any relative rotation between this bar and this body.
[0076] In another example of implementation not shown, the body 61 comprises a plurality of housings 69 which directly receive the screws 68, in the absence of an insert 70. In this other example of implementation, the fixing of the electrically conductive bar 62 on the body 61 is done directly via the screw 68, without an intermediate part.
[0077] As can be seen in Figures 4 and 5, each support 30 for electrical conductors can integrate a system 80 for holding the cover 52 on this support 30.
[0078] Each support 30 comprises, for example, a single pin 81 projecting relative to the rest of the support 30 along the longitudinal axis of the latter. Alternatively, only two of the three supports of the transformer 15 comprise a pin 81, the third support 30 being devoid of one.
[0079] Figure 5 shows in detail a pin 81, the latter being able to have a section perpendicular to the longitudinal axis of the support which is cruciform. Each pin 81 of a support 30 of electrical conductors is in the example considered force-fitted into an opening made in the cover 52, as can be seen in Figure 4. The relative arrangement of the pins 81 of the supports 30 makes it possible to immobilize the cover 52.
[0080] As can be seen in Figure 5, the holding system 80 of the cover 52 on the support 30 can extend along the longitudinal axis of the support 30 on the same side of the support 30 as a guiding system 85 of electrical conductors which will be described with reference to Figures 18 to 20.
[0081] In these figures 18 to 20, the holding system 80 is not shown, the guidance system 85 being able to be present without the holding system 80 necessarily being there.
[0082] As can be seen in Figure 18, each electrical conductor 31, 32 carried by a support 30 of the transformer 15 can be guided outside the winding 20, 21 which it defines.
[0083] In the example considered, each of these conductors 31, 32 is guided by the guiding system 85 beyond each of the ends of the electrical winding 20, 21 that it defines. As already mentioned previously, the first ends of the electrical conductors may constitute an output to the electrical circuit 10 outside the transformer 15, and three of the second ends of the electrical conductors may lead to a common point via a star connection to the primary, and three other of these second ends of the electrical conductors may lead to a common point via another star connection to the secondary.
[0084] The support 30 of the two electrical windings 31, 32 comprises:
[0085] - a wall 90 around which the electrical windings 20, 21 are arranged, and this wall 90 defines in the example considered but in a non-limiting manner a hollow cylinder of circular cross-section, and
[0086] - three flanges 92, 93, 94 offset along the longitudinal axis of the support, so that one of the electrical windings 31 is arranged between the first 92 and the second flange 92 and the other of the electrical windings 32 is arranged between the second 93 and the third 94 flange, as is clearly visible in FIG. 2 for example. The distance between two consecutive flanges 92, 93 and 93, 94 remains constant in the example considered.
[0087] The guidance system 85 acts on the electrical conductors on the one hand via clamps 97 and 98, and on the other hand via additional walls 105 and 106.
[0088] In the example of Figures 18 to 20, the guidance system 85 comprises, for each electrical conductor 31, 32, on the one hand a first clamp 97 cooperating with this electrical conductor 31, 32 beyond the first end of the electrical winding 20, 21 that it defines. Such a clamp 97 has for example two arms 99 curved so as to match an area of the contour of this end of the electrical conductor, as shown in Figure 18 or 20. This is a circular contour. Each clamp 97 is for example, but in a non-limiting manner, made in a single piece with the rest of the support 30 of electrical conductors. As already explained, each first clamp 97 cooperates for example with a portion of electrical conductor 31, 32 on the way to a connection terminal 60.
[0089] The guidance system 85 further comprises a second clamp 98 cooperating with the electrical conductor beyond the second end of the electrical winding that it defines, these first 97 and second 98 clamps succeeding one another along one of the first 92, second 93 and third 94 edges. As already explained, each second clamp 98 cooperates for example with a portion of electrical conductor 31, 32 on the way to a common point of a star connection.
[0090] More precisely, in the example considered: - the first rim 92 comprises two first clamps 97 which each cooperate respectively with one of the electrical conductors 31, 32 beyond the first end of the electrical winding 20, 21 which it defines, and two second clamps 98 which each cooperate respectively with an electrical conductor beyond the second end of this electrical winding 20, 21, and
[0091] - the second rim 93 comprises a first clamp 97, arranged under a first clamp
[0092] 97 of the first rim 92, and a second clamp 98, arranged under a second clamp 98 of the first rim. The clamps carried by the second rim 94 make it possible to guide the electrical conductor 32 outside the electrical winding arranged between the second rim 93 and the third rim 94.
[0093] It can be seen in Figures 18 to 20 that, along the edge 92, there are two pairs of clamps each formed of a first clamp 97 and a second clamp 98, and that the distance between two pairs of clamps is greater than the distance between two clamps of the same pair.
[0094] It can also be seen in these figures 19 and 20 that the clamps 97, 98 carried by the second rim 93 are aligned along the axis of the cylindrical wall 90 with clamps 97,
[0095] 98 carried by the first rim 92.
[0096] The two additional walls 105 and 106 of the guidance system 85 will now be described. These two additional walls 105 and 106 are here offset so as to define between them a guide channel 108 receiving in a stacked manner the electrical conductors 31, 32 outside the windings 20, 21 that they define. The channel 108 here has a constant dimension. These additional walls extend in the example considered on either side of an arcuate portion of the first rim 92, projecting axially beyond this first rim 92. In the overlapping zone of this first rim 92, the additional walls 105 and 106 each define an arcuate portion, the wall 106 having a radius greater than the wall 105, as is also visible in FIG. 17.
[0097] It can be seen in Figures 18 to 20 that the wall 106 comprises first openings 110 for the passage of the electrical conductors 31, 32 towards the electrical winding 20, 21 which it defines, and second openings 111 in which no electrical winding passes. It can be seen that the first openings 110 are arranged radially opposite a clamp 97, 98.
[0098] In the example of Figures 10 to 12, each support 30 of electrical conductors 31, 32 also incorporates a holding system 120 on the body 51 of the housing 50. This holding system 120 here comprises a pin 121, having in this example a section perpendicular to the longitudinal axis of the support which is cruciform. This pin 121 extends axially away from the rest of the support 30 from the third rim 94. As can be seen in Figures 10 and 12, each pin 121 is force-fitted into an opening 122 formed in the body 51 of the housing 50. This holding system can ensure immobilization of the magnetic circuit 22 on the body 51 of the housing before polymerization of the resin contained in this housing 50.
[0099] When such holding systems 120 exist, they may or may not be combined with the aforementioned holding systems 80 and guide systems 85. As can be seen in FIGS. 10 to 12, each holding system 120 may then extend axially on one side of the support 30 while the holding system 80 and the guide system 85 extend axially on the opposite side of the support 30.
[0100] We will now describe with reference to Figures 13 to 15, a functionality that can be integrated into all or part of the supports 30 of electrical conductors 31, 32. A system 130 for holding the support 30 of electrical conductors 31, 32 on the magnetic circuit 22 is thus provided. This holding system 130 is in the form of two pads 132 projecting relative to the rest of the support 30. When the holding system 120 is provided, these systems 130 and 120 can extend axially on the same side of the support, the pin 121 and a pad 132 being arranged in particular side by side as can be seen in the example of Figure 11.
[0101] Each pad 132 here defines a surface 135 coming into contact with a surface 136 of a base 26 of the magnetic circuit 22. The surfaces 135 and 136 are here flat. Each pad 132 is for example supported by a reinforcement 133, as visible in FIG. 11.
[0102] As can be deduced from Figure 15, the cooperation between the two pads 132 of a support 30 and the base 26 can ensure rotational immobilization of the support 30 on the magnetic circuit 22.
[0103] We will now describe with reference to figures 13 to 16 another functionality which can be integrated into all or part of the supports 30 of electrical conductors 31, 32. It can be seen in these figures that the cylindrical wall 90 of the support 30 comprises ribs 142 extending away from the wall 90 in the direction of the pad 27 on which this support is mounted.
[0104] In the example considered, six ribs 142 are provided, but the invention is not limited to a precise number of ribs 142. These six ribs 142 thus constitute a spacing system 140 of the cylindrical wall 90, and therefore of the electrical windings 20, 21 which it carries, of the pad 27.
[0105] It can be seen in Figures 13 to 16 that all the ribs 142 can have the same shape and be distributed uniformly around the stud 27. It can also be seen in these figures that each rib 142 can extend continuously along the axis of the support 30 from the first edge 92 to the third edge 94.
[0106] In a variant not shown, all or part of the ribs extend discontinuously along the axis of the support 30.
[0107] As can be seen in Figure 16, each rib 142 does not extend, for example, as far as the pad 27 on which the support 30 is mounted. An empty space ensuring easy mounting thus remains present between each end of a rib facing the pad 27 and this pad 27.
[0108] As already mentioned, each support 30 of electrical conductors 31, 32 can be made from a single piece.
[0109] When this support 30 integrates:
[0110] -ribs 142, and / or
[0111] - the holding system 80 of the cover 52 on the support, and / or
[0112] - the guidance system 85 of electrical conductors, and / or
[0113] - the holding system 120 of the support on the body 51 of the housing, and / or
[0114] - the system 130 for holding the support on the magnetic circuit 22, all these systems can be made in one piece or not with the rest of the support 30. In a particular example, the support 30 is thus in one piece and has all or part of the aforementioned functionalities.
[0115] The invention is not limited to the examples which have just been described.
Claims
Claims 1. Three-phase transformer (15) for isolated voltage converter (12), comprising: - a magnetic circuit (22), - three supports (30) of electrical conductors (31, 32), each support (30) being arranged around a portion (27) of the magnetic circuit (22) and carrying two windings (20, 21) in inductive coupling with each other via the magnetic circuit (22), the supports (30) defining a geometric pattern being an equilateral triangle, each support (30) comprising: - a wall (90) around which the electrical windings are arranged, and - at least two ribs (142) extending away from the wall (90) in the direction of the portion (27) of the magnetic circuit (22).
2. Transformer according to claim 1, each support comprising four, or six, or eight ribs (142), each extending away from the wall (90) in the direction of the portion (27) of the magnetic circuit.
3. Transformer according to claim 2, the ribs (142) being distributed uniformly while moving around the wall (90) of the support (30).
4. A transformer according to any preceding claim, each support (30) comprising three flanges (92, 93, 94) offset along the longitudinal axis of the support (30), such that one of the electrical windings (20, 21) is disposed between the first (92) and second (93) flanges and the other of the electrical windings (20, 21) is disposed between the second (93) and third (94) flanges.
5. Transformer according to claim 4, the two electrical windings (20, 21) carried by each support (30) following one another along this support, without overlapping along planes perpendicular to the longitudinal axis of this support (30).
6. Transformer according to claim 4 or 5, all or part of the ribs (142) extending continuously along the axis of the support (30) from the first rim (92) to the third rim (94).
7. Transformer according to any one of the preceding claims, all or part of the ribs (142) extending to the portion (27) of the magnetic circuit (22) with contact with this portion (27) or with play.
8. Transformer according to any one of the preceding claims, the wall (90) around which the electrical windings are arranged being cylindrical with a circular section.
9. Transformer according to any one of the preceding claims, each support (30) being made from a single piece. Transformer according to any one of the preceding claims, no cooling chamber using a liquid being interposed between the electrical windings (20, 21) and the portion of the magnetic circuit (22) on which the support (30) is arranged. Component (1) for the electrical power supply of a vehicle electrical energy storage unit, comprising the transformer (15) according to any one of the preceding claims.