Lt component with shared winding

Abstract

The invention relates to a component (1) comprising a planar transformer (3) formed on a PCB (2) by the interleaving of a primary winding (33) and a secondary winding (34) in a winding window formed by a first magnetic core (31, 32). It also comprises a planar inductor (4) formed by the extension of at least one of the windings by two connection tracks (340) forming connection terminals (53, 54) and by the arrangement of a second magnetic core (41, 42) around a portion (44) of each of the two connection tracks. Preferably, the planar inductor (4) is formed at the terminals of the low-voltage winding. The connection tracks (340) are formed on the same PCB to obtain a one-piece planar component, or formed on a separate PCB to obtain a rigid-flex component, wherein the flexible portion consists of a portion (60) of the connection tracks (340).

Description

[0001] DESCRIPTION

[0002] TITLE: LT COMPONENT WITH SHARED WINDING

[0003] Technical field

[0004] The present invention relates to passive electrical components incorporating a planar transformer which are used to interface a primary network and a secondary direct current network, which can equip certain on-board systems of aircraft as well as spacecraft.

[0005] The present invention aims to efficiently integrate a line inductance necessary for the proper operation of the planar transformer.

[0006] Previous techniques

[0007] It is known to use planar transformers in power converters, when galvanic isolation is required.

[0008] This is particularly the case for aircraft or even space systems, when the converter is used to connect a high voltage electrical network, for example an aeronautical high voltage direct current (HVDC) network operating at two hundred and seventy volts, to a low voltage and high current electrical network, for example a low voltage direct current (LVDC) network operating at twenty-eight volts. More generally, the invention applies to the distribution of HVDC power.

[0009] Silicon carbide or gallium nitride components, known as "Large Gap" components, are used in power converters on board aircraft and space systems, enabling high switching frequencies with lower losses, which allows a significant gain in terms of mass and volume of these on-board converters, particularly in spacecraft where optimization of weight and energy efficiency is essential.

[0010] Planar transformers, such as the one described in application FR3 129244, are designed without an inductive function in order to minimize copper losses. These planar transformers use a primary winding and a secondary winding made in a printed circuit board (or PCB), which are interlaced in a winding window formed by a magnetic core, to ensure a quasi-uniform distribution of currents.

[0011] The inductive function absent from the planar transformer but necessary for power transfer in the DC / DC converter is implemented using a discrete component.

[0012] In practice, a Litz wire wound inductor is often used, positioned at the terminals of the high voltage winding, where the stresses are the least severe.

[0013] However, this configuration introduces parasitic resonances, mainly due to the larger parasitic capacitances in a planar transformer than in a conventional wound transformer. Voltage oscillations are critical for some non-resonant converters, particularly those with a high voltage ratio, such as the Dual Active Bridge (DAB), which can interface electrical networks, for example HVDC 270 V and LVDC 28 V aeronautical networks.

[0014] These resonances can lead in particular to a drop in conversion efficiency, to overvoltages on the transformer insulation and to a risk of partial discharge.

[0015] This is why it may be possible to consider placing a line inductance on the low voltage side of the transformer. However, this solution is difficult to design and has poor performance, particularly due to the very high circulating current and the copper losses that can result, but also due to a complex interconnection to implement, for example with the low voltage (LV) bridge of the converter.

[0016] There is therefore a need to improve the integration of inductors with a planar transformer.

[0017] Statement of the invention

[0018] The invention aims to overcome at least some of the aforementioned drawbacks and to propose a dual-function passive component which effectively integrates the planar transformation and induction functions, capable of combining the advantages of compactness, performance and simplicity of design / assembly.

[0019] In view of the above, one aspect of the invention relates to a component comprising a planar transformer formed on a printed circuit board by interlacing a primary winding and a secondary winding in a winding window formed by a first magnetic core, at least one of the windings extending by two connection tracks forming connection terminals.

[0020] The component comprises a second magnetic core arranged around a portion of each of the two connection tracks, so as to form a planar inductance at the terminals of said winding.

[0021] Thus, each connection track contributes to an additional induction function, in particular by forming a half-turn in the winding window of the second magnetic core. By pooling the windings of the transformer and the inductor, the design of the two functions is facilitated by eliminating the need for coil heads and connections (terminations and electrical connectors) between the transformer and the inductor. Compactness is improved.

[0022] The result is a compact passive cell of the LT type (inductance L, transformer T).

[0023] Optional features of embodiments are defined in the appended claims. Some of these features are explained below with reference to a system, while they can be translated into method features.

[0024] In one embodiment, the two connection tracks forming connection terminals are extended onto the same printed circuit board as the primary and secondary windings. A single-piece planar LT component is thus obtained. "On the same printed circuit board" means that the windings and the two connection tracks are made up of conductive tracks formed on the same insulating support, and separated from each other by an insulating layer. The resulting assembly forms a monolithic block.

[0025] In a variant, the two connection tracks forming connection terminals are extended onto a printed circuit board separate from that of the primary and secondary windings. The resulting component is of the flex-rigid type. The connection tracks can form the mechanical connection elements, typically pivot, between the two PCBs (the planar transformer and the planar inductor). Their flexibility makes it possible to adjust the positioning of one PCB relative to the other. This configuration therefore has the advantage of easier integration of the planar component into equipment, for example of an aircraft or spacecraft.

[0026] In one embodiment, the portions of the two connection tracks are arranged on either side of a central branch of the second magnetic core. This arrangement makes it possible to design relatively simple connection track portions, for example rectilinear or curved depending on the shape of the second magnetic core.

[0027] In one embodiment, the ends of the two connection tracks extending the winding form connection terminals of the planar component, in particular for connecting a bridge in a DC / DC converter.

[0028] In one embodiment, the winding at the terminals of which the planar inductance is formed is a low voltage winding. A transformer component thus has reduced or even eliminated parasitic oscillations.

[0029] Alternatively, the winding at the terminals of which the planar inductance is formed is a high-voltage winding. This eliminates the need for a conventional Litz wire winding.

[0030] In a variant combining these two configurations, the component comprises a third magnetic core arranged around a portion of each of two connection tracks extending the other winding and forming connection terminals, so as to form a planar inductance at the terminals of said other winding. As mentioned above, the two connection tracks forming connection terminals can be provided on the same PCB or on a separate PCB in which case they can act as mechanical connection elements between the two PCBs.

[0031] In one embodiment, the connection tracks comprise a plurality of conductive tracks which are respectively formed on a plurality of layers composing the corresponding winding. This configuration facilitates the design since the layers in the winding and in the inductor can be made at the same time.

[0032] Preferably, the layers of said corresponding winding comprise single conductive turns connected in parallel with each other, the ends of each single turn of a layer being extended to form a layer of the two connection tracks.

[0033] In one embodiment, the second magnetic core is formed from a magnetic material with low relative permeability, between 10 and 100, without an air gap. This configuration limits iron losses without fringing effect.

[0034] In one variant, the second magnetic core is formed of a half-core in E with high relative permeability, between 20 and 5000 and a half-core in E or I with low relative permeability, between 10 and 100, without an air gap. This configuration allows the use of off-the-shelf magnetic elements.

[0035] According to another variant, the second magnetic core is formed from a magnetic material with high relative permeability, between 20 and 5000, with an air gap perpendicular to a main plane of the two connection tracks, i.e. perpendicular to the main plane of the printed circuit board and to the plane of the layers forming the windings. One or more air gaps may be provided.

[0036] The invention also relates to a bidirectional DC-DC electrical converter comprising a component as above. The invention also relates to an aircraft or spacecraft comprising such an electrical converter or a component as described above.

[0037] A second aspect of the invention relates to a method of manufacturing a component comprising a step of forming a planar transformer on a printed circuit board, the planar transformer comprising the interlacing of a primary winding and a secondary winding in a winding window formed by a first magnetic core, at least one of the windings extending by two connection tracks forming connection terminals.

[0038] The method further comprises a step of arranging a second magnetic core around a portion of each of the two connection tracks, so as to form a planar inductance at the terminals of said winding.

[0039] Brief description of the drawings

[0040] The invention will be better understood from a detailed study of two embodiments taken as non-limiting examples and illustrated by the appended drawings, in which:

[0041] [Fig 1] represents a single-piece planar component;

[0042] [Fig 2] shows the single-piece planar component without the upper element of the magnetic cores;

[0043] [Fig 3a] [Fig 3b] [Fig 3c] [Fig 3d] [Fig 3e] shows different layer configurations in a planar transformer;

[0044] [Fig 4] illustrates, in top view, the primary and secondary windings of the single-piece planar component according to one embodiment;

[0045] [Fig 5a] [Fig 5b] [Fig 5c] represent several sections of the single-piece planar component according to one embodiment;

[0046] [Fig 6a] [Fig 6b] [Fig 6c] represent magnetic cores of the planar inductance according to several embodiments;

[0047] [Fig 7] illustrates, in top view, a secondary winding of the single-piece planar component according to another embodiment;

[0048] [Fig 8] illustrates a flex-rigid component according to another embodiment; and

[0049] [Fig 9] represents the single-block planar component integrated into a “dual active bridge” type electrical circuit.

[0050] For the sake of clarity, the same elements are designated by the same references in the different figures. Furthermore, the various figures are not drawn to scale, as is customary in the representation of integrated circuits.

[0051] Detailed Description Figure 1 is a general perspective view of a single-piece passive planar component 1, in a completed state.

[0052] It comprises, on the same support or printed circuit board 2 (also known as PCB), a planar transformer 3, a planar inductor 4 and terminals or connection pads 53, 54 of the planar component with external circuits. Such a component integrating the functions of transformer and inductor can be called "LT component".

[0053] Figure 2 illustrates, in caval perspective, the same single-piece planar component without the upper element of the magnetic cores forming the planar transformer 3 and the planar inductor 4.

[0054] Figure 3a, Figure 3b, Figure 3c, Figure 3d and Figure 3e illustrate, in cross-section, different planar transformer configurations usable for planar transformer 3. In these figures, only the left winding window is shown, the right one being identical.

[0055] The planar transformer 3 conventionally comprises a magnetic core 31 forming a winding window and surrounded by a winding. The core 31 may comprise aluminum and ferrite comprising a zinc manganese alloy suitable for operating between one hundred and five hundred kilohertz, such as those known under the references “3C95”, “N87” and “N49”.

[0056] The shape defined by the core 31 can be of the “El”, “EE”, “EQ” or “ER” type, with typically a central branch 32 surrounded by the winding.

[0057] The winding is formed by a stack of primary layers 33 along the X axis, dedicated to the highest voltage, and secondary layers 34 still along the X axis, dedicated to the lowest voltage, separated by a dielectric 39.

[0058] The primary layers winding around the central branch 32, the whole of these is also called "primary winding", and is designated by the same reference 33 to simplify the description. Similarly, a secondary winding 34 is made up of the secondary layers. Typically, the primary and secondary windings comprise the same number of layers. For illustrative purposes only, five layers are provided in the figures, to form said primary and secondary windings.

[0059] The primary layers 33 and the secondary layers 34 respectively comprise primary conductive turns and secondary conductive turns, that is to say windings of conductive material, typically copper deposited in a thickness of between seventy and three hundred micrometers, preferably of the order of one hundred and seventy-five micrometers.

[0060] The primary layers 33 and the secondary layers 34 are covered with an insulating dielectric material 39 which separates them from each other.

[0061] In one embodiment, the primary layers 33 are superimposed and electrically connected in series.

[0062] In one embodiment, the secondary layers 34 are superimposed and electrically connected in series. Alternatively, the secondary layers are electrically connected in parallel.

[0063] Figure 3a shows a so-called “non-interlaced” configuration where the two windings are superimposed, without interlacing layers.

[0064] Figure 3b illustrates a so-called “full interleaving” configuration. The interleaving is such that a primary layer 33 is successively alternated with a secondary layer 34 in their stack along the X axis.

[0065] Figure 3c illustrates a so-called “partial interleaving” configuration. The interleaving is such that two (or another number) primary layers 33 are successively alternated with two (or another number) secondary layers 34 in their stack along the X axis, with the exception of the two extreme layers.

[0066] The schematic representation of the tracks in these figures indicates that each primary or secondary layer may comprise one or more conductive turns.

[0067] Figure 3d illustrates a fully interlaced configuration described in application FR3129244 where each primary layer 33 comprises two conductive turns in series while each secondary layer 34 comprises a single conductive turn.

[0068] Similarly, Figure 3e illustrates a partially interlaced configuration described in application FR3129244 where each primary layer 33 also comprises two conductive turns in series and each secondary layer 34 comprises a single conductive turn.

[0069] The number of layers, the number of turns per layer as well as the interlacing of the primary and secondary windings can be determined according to the desired characteristics of the converter.

[0070] The primary winding 33 is electrically connected to the primary terminals 53, typically by extending the tracks of the first and last layers of this winding onto the PCB support, to form the primary terminals 53.

[0071] The secondary winding 34 is also electrically connected to the secondary terminals 54, typically by extending the track of each of the layers of this winding into connection tracks 340. The end of the connection tracks 340 form the secondary connection terminals 54.

[0072] As illustrated in Figure 1 and Figure 2, a second magnetic core 41 is arranged around a portion 44 of each of the two connection tracks 340, so as to form the planar inductance 4 at the terminals 54 of the secondary winding 34.

[0073] The portion 44 of the connection tracks 340 devoted to the planar inductance 4 extends between the planar transformer 3 and the secondary connection terminals 54 formed by the ends of the connection tracks 340.

[0074] The shape defined by the core 41 can be of various types, including, but not limited to, the types “El”, “EE”, “EQ”, “ER”, “PM”, “RM”, with typically a central branch 42 surrounded by the portion 44 of the connection tracks 340, thus forming a winding in the winding window defined by the core 41. The stacking of the portions 44 of connection tracks 340 (illustrated for example in Figure 5b described below) forms an induction winding, also referenced 44 to simplify the explanations. The portion 44 has a width D, corresponding to the width of the core 41 constituting the planar inductance 4.

[0075] The width D can be determined, by simulation methods, taking into account the desired inductance value as well as the number of layers in the inductor winding 4.

[0076] The tracks of the secondary winding 34 are extended by a length at least equal to the sum of D and the desired length of the secondary terminals 54, so as to form the induction winding 44 in addition to the connection terminals. Compared to conventional methods of designing a planar transformer, the connection tracks 340 are extended by a distance D (and the PCB 2 as well). Minor modifications are therefore only necessary to enable the planar LT component 1 to be produced.

[0077] Figure 4 illustrates a top view of the primary and secondary windings. The primary winding 33 of the transformer 3 is wound in the winding window of the magnetic core 31 of the transformer only. The secondary winding 34 is, in turn, wound in the winding window of the magnetic core 31 of the transformer and its connection tracks 340 pass in the winding window defined by the magnetic core 41 of the inductor 4 over a length D, thus creating the induction winding 44 and the inductive function.

[0078] The secondary layers 34 each comprise a single conductive turn.

[0079] The secondary winding may comprise only conductive turns mounted (connected) in parallel with each other, for example using vias allowing the passage of conductive materials from one secondary layer to the next.

[0080] The connection tracks 340 terminating the single turns of the secondary layers are in the example formed rectilinear and parallel on the PCB 2, for a simplified design. The magnetic core 41 can advantageously be placed perpendicular to the main axis Y of the connection tracks.

[0081] The portions 44 of these two connection tracks 340 are arranged on either side of the central branch 42 of the magnetic core 41. This produces a coupled inductance which benefits from two half-turns corresponding to the two elongated connection tracks 340.

[0082] The pooling of the winding of the planar transformer 3 and the planar inductance 4 makes it possible to do without coil heads and connections between the transformer and the inductance.

[0083] Figure 5a is a view along section AA of the planar transformer 3, illustrating another example of a fully interlaced configuration with a single turn for each of the four primary layers and four secondary layers. Of course, any other configuration as discussed above can be used as an alternative.

[0084] Figure 5b is a view along section BB of the planar inductor 4, comprising an induction winding 44 also formed from four layers of conductive tracks.

[0085] Figure 5c is a view along the CC section of the single-piece planar LT component 1, illustrating the mutualization of layers between the planar transformer 3 and the planar inductance 4. By this mutualization, the connection tracks 340 comprise a plurality of conductive tracks which are formed respectively on a plurality of layers composing the secondary winding 34. The secondary winding 34 and the induction winding 44 therefore share the same layers separated by the dielectric insulator 39.

[0086] When designing the planar LT component 1, each layer 44 of the planar inductance 4 can therefore be deposited at the same time as the corresponding layer of the secondary winding 34. As shown in Figure 4, a single deposition of the same track is possible to simultaneously produce a secondary layer of the transformer 3 and a layer of the planar inductance 4.

[0087] Figure 5c also illustrates the elongation of the connection traces 340 over a length D compared to a planar transformer alone.

[0088] In particular, the two connection tracks 340 are extended on the same PCB 2 as the primary and secondary windings 33, 34, so as to obtain a single-piece planar LT component 1.

[0089] In design variants, some secondary layers of the transformer 3 are not extended into connection tracks 340. This results in an induction winding 44 formed of fewer layers than the secondary winding 34 of the transformer, while retaining the pooling of layers in the manufacturing process.

[0090] Figure 6a illustrates a magnetic core 41 according to a first embodiment.

[0091] The magnetic core 41 is made of a magnetic material with low relative permeability, between 10 and 100, without an air gap, making it possible to limit iron losses and eliminate any fringe effect causing copper losses.

[0092] Figure 6b illustrates a magnetic core 41 according to a second embodiment in which the core is partially low permeability.

[0093] In this example, the element carrying the central branch 42 (here the half-core in E) of the core 41 is formed from a magnetic material with high relative permeability, between 20 and 5000 and the other element of the core (here the half-core in I) is formed from a magnetic material with low relative permeability, between 10 and 100. Again, the magnetic core 41 is formed without an air gap, making it possible to eliminate any fringe effect.

[0094] Figure 6c illustrates a magnetic core 41 according to a third embodiment.

[0095] The magnetic core 41 is here made of a magnetic material with high relative permeability, between 20 and 5000, with air gaps 43. These air gaps 43 are arranged perpendicular to the layers of the induction winding 44, and therefore perpendicular to a main plane of the PCB 2.

[0096] The air gaps allow the magnetic field spreading there to be tangent to the conductive turns and thus to induce a current in the direction of the power current circulating in the primary and secondary windings, the fringe effect is limited.

[0097] If these figures represent a magnetic core of type “El”, they also apply to any other form of magnetic core having a central branch 42, the portions 44 of the two connection tracks 340 being arranged on either side of said central branch 42. For example, Figure 7 illustrates a planar inductance 4 whose shape defined by the second magnetic core 41 is of type “PM”, “RM” or “TS”.

[0098] In this Figure 7, the size of the PM pot has been deliberately enlarged to better illustrate that in this example, the connection tracks 340 terminating the turns of the secondary layers are no longer formed rectilinear and parallel on the PCB 2, but curved in the “PM” pot. In practice, the transverse width (along the AA axis) of the central branch 32 is greater than the transverse width of the central branch 42 of the PM pot.

[0099] This example also shows an induction winding 44 formed of turns electrically mounted (connected) in parallel. Only one end of the lower layer is extended into a connection track 340 to form one of the secondary terminals 54, the opposite end of the upper layer is extended into a connection track 340 to form the other secondary terminal 54.

[0100] Figure 8 illustrates a planar flex-rigid LT component 1' in which the primary 33 and secondary 34 windings are made on a first PCB 2, the secondary winding tracks being extended into connection tracks 340 on a second separate PCB 2'.

[0101] Section 60 of the extension of the tracks between the planar transformer 3 and the inductor 4 is produced using flexible or "flex" PCB technology. The flex section 60 thus constitutes a mechanical connection between the two PCBs 2, 2', offering at least one degree of freedom, such as that of a pivot connection.

[0102] The flex-rigid planar LT component 1' can thus be positioned in non-rectilinear locations, with constrained geometry.

[0103] As illustrated by Figure 9, the planar LT component 1 can be integrated into a bidirectional DC-DC electrical converter, such as the "dual active bridge" type electrical circuit. A transformation ratio of approximately ten is obtained between an aircraft circuit 90 (or spacecraft) accommodating a high voltage (HV) bridge 91 and the primary winding 33, and a secondary winding 34 combined with the induction winding 44 which are connected to a low voltage (LV) bridge 92.

[0104] The low voltage secondary winding 34 formed of turns in parallel makes it possible to obtain an efficiency greater than ninety-eight percent, by exploiting a larger equivalent section of copper to carry the high current to which this winding is subjected, and by improving the distribution and amplitude of the magnetic field in the winding window which limits the proximity effects between the different layers of copper.

[0105] The proposed planar LT component 1 optimizes the size, weight and efficiency because the inductance 4 results from the coupling between two half-turns extending the turns of the secondary winding 34, which makes it possible to eliminate any possible coil heads and connections between the transformer and the inductance. This therefore reduces losses and size.

[0106] This sharing of layers between transformer 3 and inductor 4 simplifies the design and manufacturing process, contributing to a reduction in manufacturing and assembly costs.

[0107] Finally, such a planar LT component 1 integrating the inductance 4 on the low voltage side makes it possible to reduce or even eliminate parasitic oscillations at the terminals of the transformer 3.

[0108] As previously indicated, the manufacturing process remains simple. The layers of the primary and secondary windings 33, 34 are produced in a conventional manner on a PCB 2 which is extended by the distance D (for a single-piece version) and which already has an opening to receive the central branch 42 of the magnetic core 41. Specifically, the tracks of the secondary winding 34 are extended into connection tracks 340. Their electrical connection in series or in parallel is carried out. Then the magnetic core 41 is positioned perpendicular to the Y axis, its central branch 42 being introduced into the opening provided for this purpose.

[0109] The passive planar component according to the invention finds application in the aeronautical field, for example within the planar transformers of converters between HVDC electrical network and LVDC electrical network, but also in the space field, in particular for the power supply of thrusters used in satellites and space probes. For example, plasma thrusters (stationary plasma) require efficient conversion of electrical energy from the high voltage network of the space vehicle to voltage and current levels optimized for the operation of the thruster.

[0110] Of course, the present invention is not limited to the embodiments described above as examples; it extends to other variants.

[0111] If, in the examples above, the winding at the terminals of which the planar inductance 4 is located is the low voltage winding, variants may provide for the planar inductance 4 to be formed at the terminals of the high voltage winding according to the preceding teachings.

[0112] The line inductance required for the converter to operate correctly can also be divided between a planar inductance on the high voltage side and a planar inductance on the low voltage side. In this configuration, the LT 1 component comprises a third magnetic core arranged around a portion of each of two connection tracks extending the other winding and forming connection terminals, so as to form a planar inductance at the terminals of said other winding.

[0113] The assembly can be made in a single piece, i.e. the planar transformer 3 and the two planar inductors on the same PCB 2. Alternatively, the planar LT component 1 can be flex-rigid in two PCBs (one comprising the planar transformer 3 and one of the two planar inductors, the other comprising the other planar inductor) or three PCBs (one for each element).

Claims

CLAIMS 1. Component (1) comprising a planar transformer (3) formed on a printed circuit board (2) by interlacing a primary winding (33) and a secondary winding (34) in a winding window formed by a first magnetic core (31, 32), at least one of the windings extending by two connection tracks (340) forming connection terminals (53, 54), characterized in that the component (1) comprises a second magnetic core (41, 42) arranged around a portion (44) of each of the two connection tracks, so as to form a planar inductance (4) at the terminals of said winding.

2. Component (1) according to claim 1, in which the two connection tracks (340) forming connection terminals are extended on the same printed circuit board (2) as the primary and secondary windings.

3. Component (1) according to claim 1, in which the two connection tracks forming connection terminals are extended onto a printed circuit board separate from that of the primary and secondary windings.

4. Component (1) according to one of claims 1 to 3, in which the portions (44) of the two connection tracks (340) are arranged on either side of a central branch (42) of the second magnetic core (41).

5. Component (1) according to one of claims 1 to 4, in which the ends of the two connection tracks (340) extending the winding form connection terminals (53, 54) of the planar component.

6. Component (1) according to one of claims 1 to 5, in which the winding (33, 34) at the terminals of which the planar inductance (4) is formed is a low voltage winding.

7. Component (1) according to one of claims 1 to 6, in which the connection tracks (340) comprise a plurality of conductive tracks (44) which are formed respectively on a plurality of layers composing the corresponding winding.

8. Component (1) according to claim 7, wherein the layers of said corresponding winding comprise single conductive turns connected in parallel with each other, the ends of each single turn of a layer being extended to form a layer of the two connection tracks.

9. Component (1) according to one of claims 1 to 8, in which the second magnetic core is one of: - a magnetic core formed from a magnetic material with low relative permeability, between 10 and 100, without an air gap, - a magnetic core formed of a half-core in E with high relative permeability, between 20 and 5000 and a half-core in E or in I with low relative permeability, between 10 and 100, without air gap, and - a magnetic core formed from a magnetic material with high relative permeability, between 20 and 5000, with an air gap perpendicular to a main plane of the two connection tracks.

10. Bidirectional DC-DC electrical converter (29) comprising a component (1) according to any one of the preceding claims. 1 1. Aircraft or spacecraft comprising at least one of a component (1) according to any one of claims 1 to 9 or a converter according to claim 10.

12. A method of manufacturing a component (1) comprising a step of forming a planar transformer (3) on a printed circuit board (2), the planar transformer comprising the interlacing of a primary winding (33) and a secondary winding (34) in a winding window formed by a first magnetic core (31, 32), at least one of the windings extending by two connection tracks (340) forming connection terminals (53, 54), characterized in that it further comprises a step of arranging a second magnetic core (41, 42) around a portion (44) of each of the two connection tracks (340), so as to form a planar inductance (4) at the terminals of said winding.

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