WO2023148177A1 - Integrated magnetic device - Google Patents

Integrated magnetic device Download PDF

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Publication number
WO2023148177A1
WO2023148177A1 PCT/EP2023/052357 EP2023052357W WO2023148177A1 WO 2023148177 A1 WO2023148177 A1 WO 2023148177A1 EP 2023052357 W EP2023052357 W EP 2023052357W WO 2023148177 A1 WO2023148177 A1 WO 2023148177A1
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WO
WIPO (PCT)
Prior art keywords
transformer
ferrite
coils
central
magnetic device
Prior art date
Application number
PCT/EP2023/052357
Other languages
French (fr)
Inventor
Wendell DA CUNHA ALVES
Norbert Messi Bene Eloundou
Larbi Bendani
Nadjib BOUZIDI
Yannick SOHIER
Original Assignee
Valeo Eautomotive France Sas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2023148177A1 publication Critical patent/WO2023148177A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters

Definitions

  • the present invention relates to an integrated magnetic device, and in particular an integrated magnetic device, also called a transformer, for a three-phase resonant converter.
  • Three-phase resonant converters are electronic circuits sometimes comprising transformers.
  • Patent US10186974B2 describes a transformer comprising two branches of additional ferrites arranged on either side of the end coils. The addition of these two ferrites increases the magnetic volume of the transformer and the losses still remain high in the box.
  • the object of the present invention is therefore to overcome one or more of the drawbacks of the devices of the prior art by proposing an integrated magnetic device configured to limit the drop in the value of the inductances in the aluminum case, unbalanced currents and a frequency of non-uniform resonance, and high losses in the aluminum case.
  • This integrated magnetic device constitutes for example a three-phase transformer.
  • the present invention proposes an integrated magnetic device comprising at least three coils each formed of at least one winding around a ferrite column, the coils being arranged so as to form an equilateral triangle, the device comprising a central element in ferrite placed between the three coils.
  • This central element with branch allows a continuous flow with low ferrite losses.
  • Each column may have, in a plane perpendicular to its longitudinal axis, a section of the same shape as that of the other columns and different from that of the central element in this plane.
  • the section of the columns is for example circular and that of the central element is not circular.
  • the columns In said plane perpendicular to its longitudinal axis, the columns have for example exactly the same shape. In such a case, all the columns have for section a circle of the same radius.
  • the central element has a height H equal to the height h of a coil.
  • the phases are decoupled, this means that the flux generated by one phase is not linked by the other phases.
  • the ferrite element comprises a central part in the form of a pillar from which three branches extend.
  • the shape of the branches is adapted to be inserted between the coils.
  • Each branch can present, in a plane perpendicular to the longitudinal axes of the columns, a dimension which first decreases when one moves away from the central part, then which increases until the end of this branch.
  • the end of each branch is planar.
  • a third ferrite element of triangular shape is arranged on the underside of the central ferrite element.
  • the central element and a part of each column can be made in one piece and form the lower part of the integrated magnetic device.
  • the invention also relates to the use of the device according to the invention in a motor vehicle, in particular for the electrical supply of a vehicle electrical energy storage unit.
  • the electrical energy storage unit is for example a battery which can have a nominal voltage according to the values mentioned above.
  • FIG. 1 represents the power architecture of a CLLLC type converter
  • FIG. 3 is a schematic representation of an elevational view of the central element of the integrated magnetic device according to one embodiment of the invention.
  • FIG. 4 is a sectional representation of a device according to the invention with an aluminum case
  • FIG. 5 is a diagram of the magnetic circuit of the device according to one embodiment of the invention.
  • the magnetic device according to the invention has a triangular geometry. That is, the 3 coils are arranged to form an equilateral triangle. More precisely, each coil is arranged at the edge of a triangle.
  • the device comprises a central ferrite element 20 disposed between the three coils 11, 12, 13 visible in detail [FIG. 3]. This central element 20 has no air gap.
  • each branch 11, 12, 13 is flat. That is, each end forms a flat plane in the direction of the height H.

Abstract

The present invention relates to an integrated magnetic device (10) comprising at least three coils (11, 12, 13), each formed by at least one winding (111, 112, 113, 111', 112', 113') around a ferrite column (121, 122, 123), the coils (11, 12, 13) being arranged so as to form an equilateral triangle, the device comprising a central ferrite element (20) arranged between the three coils (11, 12, 13).

Description

Dispositif magnétique intégré Built-in magnetic device
La présente invention concerne un dispositif magnétique intégré, et notamment un dispositif magnétique intégré, également appelé transformateur, pour convertisseur résonant triphasé.The present invention relates to an integrated magnetic device, and in particular an integrated magnetic device, also called a transformer, for a three-phase resonant converter.
Plus particulièrement, l’invention trouve des applications dans le domaine des systèmes hautes tensions qui sont supérieures à 60V, par exemple supérieures à 300V, par exemple à 800V. More particularly, the invention finds applications in the field of high voltage systems which are greater than 60V, for example greater than 300V, for example 800V.
Les convertisseurs résonants triphasés sont des circuits électroniques comportant parfois des transformateurs. Three-phase resonant converters are electronic circuits sometimes comprising transformers.
Ils sont souvent utilisés dans par exemple des applications de charge de batterie en raison de leur rendement élevé, de leur large plage de tension, de leur faible ondulation de courant et de leur capacité de puissance élevée. They are often used in eg battery charging applications due to their high efficiency, wide voltage range, low current ripple and high power capability.
Les composant magnétiques, tels que les transformateurs, intégrés dans les convertisseurs sont ainsi essentiels aux performances des convertisseurs car ils définissent leur puissance.The magnetic components, such as transformers, integrated in the converters are thus essential to the performance of the converters because they define their power.
Il est déjà connu des transformateurs triphasés comportant trois bobines formées d’un enroulement autour d’une colonne ou noyau en ferrite disposés dans un même plan dans un boitier en aluminium. Ce type de transformateur présente plusieurs inconvénients limitant ces performances. Ces inconvénients sont des chutes inductances élevées lorsque le transformateur est disposé dans le boitier en aluminium, des courants déséquilibrés, une fréquence de résonance non uniforme, et des pertes élevées dans le boitier en aluminium. It is already known three-phase transformers comprising three coils formed by a winding around a ferrite column or core arranged in the same plane in an aluminum case. This type of transformer has several disadvantages limiting this performance. These drawbacks are high inductance drops when the transformer is disposed in the aluminum case, unbalanced currents, non-uniform resonant frequency, and high losses in the aluminum case.
Il existe des solutions pour essayer d’améliorer ces transformateurs. There are solutions to try to improve these transformers.
Le brevet US10186974B2 décrit un transformateur comportant deux branches de ferrites supplémentaires disposées de parts et d’autres des bobines des extrémités. L’ajout de ces deux ferrites augmentent le volume magnétique du transformateur et les pertes restent encore élevées dans le boitier. Patent US10186974B2 describes a transformer comprising two branches of additional ferrites arranged on either side of the end coils. The addition of these two ferrites increases the magnetic volume of the transformer and the losses still remain high in the box.
Le brevet CN212010657U décrit un transformateur avec des plaques magnétiques supplémentaires entourant les bobines. L’ajout de ces plaques augmentent le volume magnétique du transformateur et il reste des courants déséquilibrés. Patent CN212010657U describes a transformer with additional magnetic plates surrounding the coils. Adding these plates increases the magnetic volume of the transformer and unbalanced currents remain.
La présente invention a donc pour objet de pallier un ou plusieurs des inconvénients des dispositifs de l’art antérieur en proposant un dispositif magnétique intégré configuré pour limiter la chute de la valeur des inductances dans le boitier en aluminium, des courants déséquilibrés et une fréquence de résonance non uniforme, et des pertes élevées dans le boitier en aluminium. Ce dispositif magnétique intégré constitue par exemple un transformateur triphasé. Pour cela la présente invention propose un dispositif magnétique intégré comportant au moins trois bobines formées chacune d’au moins un enroulement autour d’une colonne en ferrite, les bobines étant disposées de façon à former un triangle équilatéral, le dispositif comportant un élément central en ferrite disposé entre les trois bobines. The object of the present invention is therefore to overcome one or more of the drawbacks of the devices of the prior art by proposing an integrated magnetic device configured to limit the drop in the value of the inductances in the aluminum case, unbalanced currents and a frequency of non-uniform resonance, and high losses in the aluminum case. This integrated magnetic device constitutes for example a three-phase transformer. For this, the present invention proposes an integrated magnetic device comprising at least three coils each formed of at least one winding around a ferrite column, the coils being arranged so as to form an equilateral triangle, the device comprising a central element in ferrite placed between the three coils.
Cet élément central avec branche permet un flux continu avec de faible pertes de ferrite.This central element with branch allows a continuous flow with low ferrite losses.
Cet élément central avec branche peut être dépourvu d’enroulement disposé autour de lui.This central element with branch can be devoid of winding arranged around it.
Chaque colonne peut présenter, dans un plan perpendiculaire à son axe longitudinal, une section de même forme que celle des autres colonnes et différente de celle de l’élément central dans ce plan. La section des colonnes est par exemple circulaire et celle de l’élément central n’est pas circulaire. Dans ledit plan perpendiculaire à son axe longitudinal, les colonnes ont par exemple exactement la même forme. Dans un tel cas, toutes les colonnes ont pour section ont cercle de même rayon. Each column may have, in a plane perpendicular to its longitudinal axis, a section of the same shape as that of the other columns and different from that of the central element in this plane. The section of the columns is for example circular and that of the central element is not circular. In said plane perpendicular to its longitudinal axis, the columns have for example exactly the same shape. In such a case, all the columns have for section a circle of the same radius.
Selon un mode de réalisation de l’invention, l’élément central a une hauteur H égale à la hauteur h d’une bobine. According to one embodiment of the invention, the central element has a height H equal to the height h of a coil.
Selon un mode de réalisation de l’invention, les trois colonnes ont chacune au moins un entrefer. According to one embodiment of the invention, the three columns each have at least one air gap.
Selon un mode de réalisation de l’invention, l’élément en ferrite n’a pas d’entrefer. According to one embodiment of the invention, the ferrite element has no air gap.
La partie centrale n’ayant pas d'entrefer, les phases sont découplées, cela signifie que le flux généré par une phase n’est pas lié par les autres phases. Since the central part does not have an air gap, the phases are decoupled, this means that the flux generated by one phase is not linked by the other phases.
Selon un mode de réalisation de l’invention, l’élément en ferrite comporte une partie centrale en forme de pilier à partir de laquelle s’entendent trois branches. According to one embodiment of the invention, the ferrite element comprises a central part in the form of a pillar from which three branches extend.
Selon un mode de réalisation de l’invention, la forme des branches est adaptée pour s’insérer entre les bobines. Chaque branche peut présenter, dans un plan perpendiculaire aux axes longitudinaux des colonnes, une dimension qui décroît d’abord lorsque l’on s’éloigne de la partie centrale, puis qui croît jusqu’à l’extrémité de cette branche. According to one embodiment of the invention, the shape of the branches is adapted to be inserted between the coils. Each branch can present, in a plane perpendicular to the longitudinal axes of the columns, a dimension which first decreases when one moves away from the central part, then which increases until the end of this branch.
Selon un mode de réalisation de l’invention, l’extrémité de chaque branche est plane. According to one embodiment of the invention, the end of each branch is planar.
Selon un mode de réalisation de l’invention, un deuxième élément en ferrite de forme triangulaire est disposé sur la face supérieure de l’élément central en ferrite. En variante, une partie de chaque colonne peut être réalisée d’une seule pièce avec la partie correspondante des autres colonnes, et cette pièce peut former la partie supérieure du dispositif magnétique intégré.According to one embodiment of the invention, a second ferrite element of triangular shape is arranged on the upper face of the central ferrite element. Alternatively, a part of each column can be made in one piece with the corresponding part of the other columns, and this part can form the upper part of the integrated magnetic device.
Selon un mode de réalisation de l’invention, un troisième élément en ferrite de forme triangulaire est disposé sur la face inférieure de l’élément central en ferrite. En variante, l’élément central et une partie de chaque colonne peuvent être réalisés d’une seule pièce et former la partie inférieure du dispositif magnétique intégré. L’invention concerne également l’utilisation du dispositif selon l’invention dans un véhicule automobile, notamment pour l’alimentation électrique d’une unité de stockage d’énergie électrique de véhicule. L’unité de stockage d’énergie électrique est par exemple une batterie pouvant présenter une tension nominale selon les valeurs mentionnées ci-dessus.According to one embodiment of the invention, a third ferrite element of triangular shape is arranged on the underside of the central ferrite element. As a variant, the central element and a part of each column can be made in one piece and form the lower part of the integrated magnetic device. The invention also relates to the use of the device according to the invention in a motor vehicle, in particular for the electrical supply of a vehicle electrical energy storage unit. The electrical energy storage unit is for example a battery which can have a nominal voltage according to the values mentioned above.
D'autres buts, caractéristiques et avantages de l'invention seront mieux compris et apparaîtront plus clairement à la lecture de la description faite, ci-après, en se référant aux figures annexées, données à titre d'exemple et dans lesquelles: Other aims, characteristics and advantages of the invention will be better understood and will appear more clearly on reading the description given below, with reference to the appended figures, given by way of example and in which:
- la [Fig. 1] représente l'architecture de puissance d'un convertisseur de type CLLLC, - the [Fig. 1] represents the power architecture of a CLLLC type converter,
- la [Fig. 2] est une représentation schématique d’une vue en élévation du dispositif magnétique intégré selon un mode de réalisation de l'invention, - the [Fig. 2] is a schematic representation of an elevational view of the integrated magnetic device according to one embodiment of the invention,
- la [Fig. 3] est une représentation schématique d’une vue en élévation de l’élément centrale du dispositif magnétique intégré selon un mode de réalisation de l'invention, - the [Fig. 3] is a schematic representation of an elevational view of the central element of the integrated magnetic device according to one embodiment of the invention,
- la [Fig. 4] est une représentation en coupe d’un dispositif selon l’invention avec un boitier aluminium, - the [Fig. 4] is a sectional representation of a device according to the invention with an aluminum case,
- la [Fig. 5] est schéma du circuit magnétique du dispositif selon un mode de réalisation de l'invention. - the [Fig. 5] is a diagram of the magnetic circuit of the device according to one embodiment of the invention.
L’invention concerne un dispositif magnétique intégré. The invention relates to an integrated magnetic device.
Selon un mode de réalisation de l ‘invention, ce dispositif magnétique est un transformateur pour convertisseur de tension résonant triphasés. Le convertisseur de de tension résonant triphasé est de type LLC, CLLC, CLLLC, LC ou CLC. L’architecture de puissance d'un convertisseur de type CLLLC est illustré sur la [Fig. 1]. According to one embodiment of the invention, this magnetic device is a transformer for a three-phase resonant voltage converter. The three-phase resonant voltage converter is of the LLC, CLLC, CLLLC, LC or CLC type. The power architecture of a CLLLC type converter is illustrated in [Fig. 1].
La [Fig. 2] illustre un dispositif magnétique 10 intégré selon l’invention. The [Fig. 2] illustrates an integrated magnetic device 10 according to the invention.
Le dispositif magnétique 10 comporte au moins trois bobines 11, 12, 13 formées chacune d’au moins un enroulement primaire 111, 112, 113 et un enroulement secondaire 111’, 112’, 113’ autour d’une colonne ou noyau 121, 122, 123 en ferrite The magnetic device 10 comprises at least three coils 11, 12, 13 each formed of at least one primary winding 111, 112, 113 and a secondary winding 111', 112', 113' around a column or core 121, 122 , 123 ferrite
Selon un mode de réalisation de l’invention, ces trois colonnes 121, 122, 123 ont chacune au moins un entrefer. According to one embodiment of the invention, these three columns 121, 122, 123 each have at least one air gap.
Le dispositif magnétique selon l’invention a une géométrie triangulaire. C’est-à-dire que les 3 bobines sont disposées de façon à former un triangle équilatéral. Plus précisément chaque bobine est disposée au niveau de l’arrête d’un triangle. The magnetic device according to the invention has a triangular geometry. That is, the 3 coils are arranged to form an equilateral triangle. More precisely, each coil is arranged at the edge of a triangle.
Le fait que la disposition soit selon un triangle équilatérale permet équilatéral permet de garantir un équilibrage entre les paramètres électriques tels que les inductances de chaque bobine et réduire le volume magnétique. Dans le cadre de l’invention le dispositif comporte un élément 20 centrale en ferrite disposé entre les trois bobines 11 12, 13 visible en détail [Fig. 3]. Cet élément 20 centrale n’a pas d’entrefer. The fact that the arrangement is according to an equilateral triangle makes it possible to guarantee balancing between the electrical parameters such as the inductances of each coil and to reduce the magnetic volume. In the context of the invention, the device comprises a central ferrite element 20 disposed between the three coils 11, 12, 13 visible in detail [FIG. 3]. This central element 20 has no air gap.
L’élément central 20 sans entrefer permet de découpler les phases et équilibrer les fuites d’inductances. Cet élément 20 permet également de concentrer le flux magnétique de fuite à l’intérieur du transformateur. The central element 20 without air gap makes it possible to decouple the phases and balance the inductance leaks. This element 20 also makes it possible to concentrate the leakage magnetic flux inside the transformer.
Selon un mode de réalisation de l’invention, l’élément 20 à une hauteur H égale à la hauteur h d’une bobine 11, 12, 13. La hauteur h d’une bobine est définie par la distance entre ses deux extrémités. According to one embodiment of the invention, the element 20 has a height H equal to the height h of a coil 11, 12, 13. The height h of a coil is defined by the distance between its two ends.
Selon un mode de réalisation de l’invention, l’élément 20 en ferrite comporte une partie centrale 24 en forme de pilier à partir de laquelle s’entendent trois branches 21, 22, 23. According to one embodiment of the invention, the ferrite element 20 comprises a central part 24 in the form of a pillar from which three branches 21, 22, 23 extend.
La forme des branches est adaptée pour s’insérer entre les bobines. C’est-à-dire que chaque branche comporte deux cotés arrondis dont les contours suivent la forme d’une bobine. Les côtés de deux branches contiguës forment une courbe 220, 230, 240 qui suit le contour d’une bobine 11, 12, 13. The shape of the branches is adapted to fit between the coils. That is to say that each branch has two rounded sides whose contours follow the shape of a coil. The sides of two contiguous branches form a curve 220, 230, 240 which follows the contour of a coil 11, 12, 13.
Cette élément central 20 avec branche permet un flux continu avec de faible pertes de ferrite. This central element 20 with branch allows a continuous flow with low ferrite losses.
Selon un mode de réalisation de l’invention, l’extrémité 211, 212, 213 de chaque branche 11, 12, 13 est plate. C’est-à-dire que chaque extrémité forme un plan plat dans le sens de la hauteur H. According to one embodiment of the invention, the end 211, 212, 213 of each branch 11, 12, 13 is flat. That is, each end forms a flat plane in the direction of the height H.
Selon un mode de réalisation de l’invention un deuxième élément 40 en ferrite de forme triangulaire est disposé sur la face supérieure de l’élément 20 en ferrite, c’est-à-dire celle disposée dans le plan de la face supérieur des bobines. According to one embodiment of the invention, a second ferrite element 40 of triangular shape is arranged on the upper face of the ferrite element 20, that is to say that arranged in the plane of the upper face of the coils. .
Selon un mode de réalisation de l’invention, un troisième élément 50 en ferrite de forme triangulaire est disposé sur la face inférieure de l’élément 20 en ferrite, c’est-à-dire celle disposée dans le plan de la face inférieure des bobines. According to one embodiment of the invention, a third ferrite element 50 of triangular shape is arranged on the lower face of the ferrite element 20, that is to say that arranged in the plane of the lower face of the coils.
Le terme supérieur est défini par opposition au terme inférieur, chacun des termes représentant respectivement une des deux extrémités des bobines. The upper term is defined in opposition to the lower term, each of the terms respectively representing one of the two ends of the coils.
Selon un mode de réalisation de l’invention, les arrêtes des deuxième 40 et troisième 50 éléments sont vives ou arrondies. According to one embodiment of the invention, the edges of the second 40 and third 50 elements are sharp or rounded.
Selon un mode de réalisation de l’invention, le dispositif magnétique 10 est disposé dans un boitier en aluminium 60 illustré [Fig. 4]. L’élément central 20 n'ayant pas d'entrefer, les phases sont découplées, cela signifie que le flux généré par une phase n’est pas lié par les autres phases. Sous cette hypothèse, il est possible d’analyser le dispositif 10 avec le circuit magnétique sur la [Fig. 5]. According to one embodiment of the invention, the magnetic device 10 is placed in an aluminum box 60 illustrated [FIG. 4]. Since the central element 20 does not have an air gap, the phases are decoupled, this means that the flux generated by one phase is not linked by the other phases. Under this assumption, it is possible to analyze the device 10 with the magnetic circuit in [FIG. 5].
Dans ce circuit Rc est le matériau magnétique, par exemple la ferrite, la réluctance, Rg est la réluctance de l'entrefer, Rw est la réluctance de la fenêtre de bobinage, Npl est le nombre de spires dans phase primaire 1, Nsi est le nombre de spires dans la phase secondaire 1, Ipl est le courant primaire dans la phase 1 et Isl est le courant secondaire dans la phase 1. In this circuit Rc is the magnetic material, for example ferrite, reluctance, Rg is the reluctance of the air gap, Rw is the reluctance of the winding window, Npl is the number of turns in primary phase 1, Nsi is the number of turns in secondary phase 1, Ipl is the primary current in phase 1 and Isl is the secondary current in phase 1.
Si l'on considère que la réluctance du matériau magnétique est négligeable, les circuits magnétiques équivalents peuvent être dérivées, on peut calculer l'inductance magnétique, la fuite d'inductance côté primaire et la fuite d’inductance côté secondaire selon les formules suivantes: Considering that the reluctance of the magnetic material is negligible, the equivalent magnetic circuits can be derived, the magnetic inductance, primary side inductance leakage and secondary side inductance leakage can be calculated according to the following formulas:
. _ Np2i. . _ Np 2 i.
Llkg-p n L lkg-p n
Kw
Figure imgf000007_0001
 K.w.
Figure imgf000007_0001
Les résultats pour un dispositif selon l’invention sont les suivants, [table 1]
Figure imgf000007_0002
The results for a device according to the invention are as follows, [table 1]
Figure imgf000007_0002
Comme l’illustre ces résultats, un dispositif magnétique intégré selon l’invention permet d’avoir des inductances avec des valeurs qui ne chute pas avec l’utilisation du boitier en aluminium. En effet, la chute d'inductance est toujours inférieure à 5% à l’intérieur du boitier en aluminium. Avec un tel dispositif, il est également observé que la densité de flux magnétique dans l’élément centrale 20 a une valeur presque continue et, par conséquent, des pertes par hystérésis très faibles. As these results illustrate, an integrated magnetic device according to the invention makes it possible to have inductors with values which do not drop with the use of the aluminum casing. Indeed, the inductance drop is always less than 5% inside the aluminum case. With such a device, it is also observed that the magnetic flux density in the central element 20 has an almost continuous value and, consequently, very low hysteresis losses.
Selon une variante de l’invention, les angles de l’élément central 20 sont agrandis pour augmenter la fuite d’inductance. According to a variant of the invention, the angles of the central element 20 are enlarged to increase the inductance leakage.
Selon une autre variante de l’invention, le dispositif comporte une quatrième bobine pour permettre une sortie basse tension, pour par exemple une utilisation dans un composant pour l’alimentation électrique d’une unité de stockage d’énergie électrique de véhicule, encore appelé « OBC/DCDC ». L’invention concerne également un convertisseur résonant triphasé comportant un dispositif magnétique selon l’invention. According to another variant of the invention, the device comprises a fourth coil to allow a low voltage output, for example for use in a component for the power supply of a vehicle electrical energy storage unit, also called “OBC/DCDC”. The invention also relates to a three-phase resonant converter comprising a magnetic device according to the invention.
L’invention concerne également l’utilisation du convertisseur résonant triphasé selon l’invention dans un véhicule thermique, électrique ou hybride. The invention also relates to the use of the three-phase resonant converter according to the invention in a thermal, electric or hybrid vehicle.
La portée de la présente invention ne se limite pas aux détails donnés ci-dessus et permet des modes de réalisation sous de nombreuses autres formes spécifiques sans s'éloigner du domaine d'application de l'invention. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration, et peuvent être modifiés sans toutefois sortir de la portée définie par les revendications. The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and can be modified without departing from the scope defined by the claims.

Claims

Revendications Claims
1. Transformateur (10) comportant au moins trois bobines (11, 12, 13) formées chacune d’au moins un enroulement (111, 112, 113, 111’, 112’, 113’) autour d’une colonne (121, 122, 123) en ferrite, les bobines (11, 12, 13) étant disposées de façon à former un triangle équilatéral, caractérisé en ce qu’il comporte un élément (20) central en ferrite disposé entre les trois bobines (11 12, 13), en que les trois colonnes (121, 122, 123) ont chacune au moins un entrefer, et en ce que l’élément central (20) en ferrite n’a pas d’entrefer.1. Transformer (10) comprising at least three coils (11, 12, 13) each formed of at least one winding (111, 112, 113, 111', 112', 113') around a column (121, 122, 123) in ferrite, the coils (11, 12, 13) being arranged so as to form an equilateral triangle, characterized in that it comprises a central element (20) in ferrite arranged between the three coils (11 12, 13), in that the three columns (121, 122, 123) each have at least one air gap, and in that the central ferrite element (20) has no air gap.
2. Transformateur selon la revendication 1, dans lequel l’élément (20) central à une hauteur H égale à la hauteur h d’une bobine (11, 12, 13). 2. Transformer according to claim 1, in which the central element (20) has a height H equal to the height h of a coil (11, 12, 13).
3. Transformateur selon la revendication 1 ou 2, dans lequel l’élément central (20) est dépourvu d’enroulement disposé autour de lui. 3. Transformer according to claim 1 or 2, wherein the central element (20) has no winding arranged around it.
4. Transformateur selon l’une quelconque des revendications précédentes, dans lequel chaque colonne (121, 122, 123) présente, dans un plan perpendiculaire à son axe longitudinal, une section de même forme que celle des autres colonnes et différente de celle de l’élément central (20) dans ce plan. 4. Transformer according to any one of the preceding claims, in which each column (121, 122, 123) has, in a plane perpendicular to its longitudinal axis, a section of the same shape as that of the other columns and different from that of the central element (20) in this plane.
5. Transformateur (10) selon une des revendication 1 à 4, dans lequel l’élément (20) en ferrite comporte une partie centrale (24) en forme de pilier à partir de laquelle s’entendent trois branches (21, 22, 23). 5. Transformer (10) according to one of claims 1 to 4, wherein the ferrite element (20) comprises a central part (24) in the form of a pillar from which three branches (21, 22, 23 ).
6. Transformateur (10) selon la revendication 5, dans lequel la forme des branches (21, 22, 23) est adaptée pour s’insérer entre les bobines (11, 12, 13). 6. Transformer (10) according to claim 5, in which the shape of the branches (21, 22, 23) is adapted to be inserted between the coils (11, 12, 13).
7. Transformateur (10) selon une des revendications 5 ou 6, dans lequel l’extrémité (211, 212, 213) de chaque branche (11, 12, 13) est plane. 7. Transformer (10) according to one of claims 5 or 6, wherein the end (211, 212, 213) of each branch (11, 12, 13) is planar.
8. Transformateur (10) selon une des revendications 1 à 7, dans lequel un deuxième élément (40) en ferrite de forme triangulaire est disposé sur la face supérieure de l’élément (20) centrale en ferrite. 8. Transformer (10) according to one of claims 1 to 7, wherein a second triangular-shaped ferrite element (40) is arranged on the upper face of the central ferrite element (20).
9. Transformateur (10) selon une des revendications 1 à 8, dans lequel un troisième élément (50) en ferrite de forme triangulaire est disposé sur la face inférieure de l’élément (20) en ferrite. 9. Transformer (10) according to one of Claims 1 to 8, in which a third ferrite element (50) of triangular shape is arranged on the underside of the ferrite element (20).
10. Utilisation du transformateur (10) selon une des revendications 1 à 9 dans un véhicule automobile pour l’alimentation électrique d’une unité de stockage d’énergie électrique. 10. Use of the transformer (10) according to one of claims 1 to 9 in a motor vehicle for the power supply of an electrical energy storage unit.
PCT/EP2023/052357 2022-02-01 2023-01-31 Integrated magnetic device WO2023148177A1 (en)

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DE102018206389A1 (en) * 2018-04-25 2019-10-31 Siemens Aktiengesellschaft Three-phase transformer
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EP1835604A1 (en) * 2006-03-16 2007-09-19 STMicroelectronics S.r.l. Magnetic core for a coupled multi coil filter inductor
EP1914868A1 (en) * 2006-10-20 2008-04-23 Vacon Oyj Filtering choke arrangement for a frequency converter
US20150102881A1 (en) * 2012-05-07 2015-04-16 Wobben Properties Gmbh Three-phase choke
US10186974B2 (en) 2013-11-07 2019-01-22 Huawei Technologies Co., Ltd. Magnetic integrated device for coupling with a three-phase parallel circuit and power conversion circuit
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