Power converter having segmented windings - Patents.com

Abstract

A power converter with segmented windings is provided. The power converter includes a transformer or autotransformer including a magnetic core (3) and at least one primary winding (51) and at least one secondary winding (52) arranged around the magnetic core (3). The primary winding and / or secondary winding, each having at least one full turn, are connected in series and include at least one power switch (10) and at least one capacitor (12), which are arranged opposite each other and face opposite sides of the magnetic core, defining cells (4) divided into four segments: a first segment (23) including the at least one switch, a second opposing segment (24) including the at least one capacitor, and two other connecting segments (21, 22) providing electrical connection between the first and second segments, each of the two other connecting segments having opposite electrical polarities.

Description

[Technical field]

[0001] The present invention relates to the field of power converters comprising a transformer or autotransformer (or Autotransformer) intended to connect a primary port to a secondary port, the primary port containing a DC or AC energy source and the secondary port containing a DC or AC load, power can flow in both directions simply by swapping the energy source and the load.

[0002] The present invention is based on the integration of at least one turn of a winding wound around a magnetic core of a transformer or autotransformer, at least one switch and at least one capacitor arranged oppositely, thereby dividing or isolating the at least one turn into four distinct segments, i.e. providing a segmented winding.

[0003] The load is further integrated and housed within a magnetic core, which is surrounded by a segmented winding having at least one switch and at least one capacitor on at least two sides.

[0004] In the present invention, the term "cell" is used to refer to a complete / full turn of a winding / coil of a transformer or autotransformer incorporating at least one power switch and at least one capacitor connected in series, positioned opposite each other, facing both sides of a magnetic core. The winding may be either a primary winding or a secondary winding.

[0005] In the present invention, the conductor element can be any kind of conductive material, such as Cu, Cu alloy, and so on. [Background technology]

[0006] EP 1 536 435 A1 discloses a circuit board having openings. Each separate magnetic flux path passes through at least one of the openings to form a closed loop surrounding an interior space. The magnetic flux paths include a portion located within a magnetically permeable core piece. At least two magnetic flux paths are oriented such that there is a straight line in the circuit board, which passes through the interior space of the two magnetic flux paths without passing through any of the openings contained therein. An electrically conductive primary winding has a first segment that passes through the interior space of the magnetically permeable paths and a second segment that is located outside the interior space. There are two or more electrically conductive secondary windings.

[0007] Ionel Dan Jitaru of Rompower Energy Systems Inc., in his technical paper “GaN Technology as an enabler for Higher Efficiency Magnetics”, discloses several switching topologies and, referring to leakage inductance in transformers, indicates on page 9 that “in some applications, an additional inductive element is placed in series with the primary winding to add to the leakage inductance” but does not provide any hint about including switches or capacitors within the turns of the primary or secondary windings.

[0008] US Patent Application Publication No. 2020 / 0350117 refers to a transformer comprising a magnetic core including a plurality of core legs and a leakage core leg, the leakage core leg being disposed between the plurality of core legs to control the leakage inductance of the transformer, and a planar winding structure including a primary winding and a plurality of secondary windings, the primary winding and the plurality of secondary windings extending with a number of turns around the plurality of core legs to further control the leakage inductance of the matrix transformer, and the planar winding structure having no turns around the leakage core leg. In the example of FIG. 2, the matrix transformer can be integrated into a single magnetic core. Transformers is an element Transformers Including the secondary Winding Each of the rectifier and Capacitor Includes.

[0009] US Patent Publication No. 2015 / 0256087 discloses a soft-switching transformer with a double (or dual) transformer and at least two primary switching devices and at least two synchronous rectifiers on the secondary side, each of the primary switching devices being turned off when the corresponding synchronous rectifier is turned on. The use of a large leakage inductance in the zero voltage switching of the prior art topology avoids having soft switching in the primary and also in the secondary, turning off the rectifier means at zero current and turning on the primary switch at zero voltage, without additional magnetic elements. The magnetic core is arranged around the rectifier means. Transformers The secondary windings of either switch and Capacitor (See Figure 3B)

[0010] US Patent Application Publication No. 2018 / 0027817 discloses a power conversion device including a first primary circuit having a first primary winding, a second primary circuit having a second primary winding, an inductor having an inductor winding coupled in series with the first primary winding and the second primary winding, a first secondary circuit corresponding to the first primary circuit and having first and second secondary windings coupled in series, a second secondary circuit corresponding to the second primary circuit and having third and fourth secondary windings coupled in series, and a magnetic core structure, the magnetic core having a one turn flat conductor winding (see FIG. 11) disposed around the magnetic core. Secondary Winding (See Figure 2) operates according to the corresponding switching control signal. switch (which may be a transistor, for example) and an output connected by splitting the turns in series in at least two segments. Capacitor (See FIG. 11).

[0011] The invention proposes a segmentation of a winding surrounding a magnetic core, the winding being part of a transformer or autotransformer of a power converter, the winding comprising at least one full turn defining a cell, at least one cell incorporating at least one switch and at least one capacitor connected in series and positioned opposite each other and facing both sides of the magnetic core. In this way, the cell is divided into four segments, two of which integrate the at least one switch and the at least one capacitor, positioned opposite each other and mounted thereon, and the other two segments have opposite electrical polarity and act as electrical connection elements of the segments with mounted components.

[0012] Such an arrangement in a cell having one or more switches and one or more capacitors on opposite sides, each with two connection segments facing each other with opposite electrical polarity connected in series and surrounding a magnetic core, allows: - inserting a load into an opening in the magnetic core surrounded by at least one cell and supplying said load from opposite polarity segments of said at least one cell; - generating a compact 2D or 3D spatial structure comprising a plurality of interconnected cells; - Creating a compact 2D or 3D spatial structure comprising a compact plurality of interconnected cells, where at least some of the cells share a magnetic path or share a primary winding that energizes the cells.

[0013] The winding according to the invention may include several cells, each cell including at least one switch and at least one capacitor, furthermore the cells are connected in parallel, whereby the current capability of the power converter can be adjusted, i.e. tunable.

[0014] In certain preferred embodiments, a power converter includes a magnetic core grid associated with a plurality of interconnected cells, with different cells enclosing different magnetic paths. The magnetic core grid includes a plurality of openings, some of which include a capacitor associated with one of the interconnected cells, the capacitor being located on a side of the opening (wherein the opening may include one or more capacitors), and these openings having the capacitor(s) further accommodate a load. The magnetic core grid further includes a power switch for the cell having the capacitor in another adjacent opening, the power switch being located on a side of the other adjacent opening.

[0015] The cited load, housed within the opening having at least one capacitor on one of the sides of the opening, receives energy from conductive plates disposed above and below the magnetic grid core.

[0016] The invention also relates to several structural embodiments for at least a part of the power converter. In an exemplary embodiment, one segment of said at least one cell, including at least one switch, is integrated on a first electronic substrate, a second segment of the cell, including at least one capacitor, is integrated on a second electronic substrate, and a segment of the cell providing an electrical connection of the two cited segments is located at least partially on either of the electronic substrates or as an independent component.

[0017] Other features of the invention are explained in the following description of the invention with reference to particular embodiments. [Brief description of the drawings]

[0018] FIG. 1 is a schematic diagram of a magnetic core showing magnetic flux paths according to the prior art. FIG. 2 is a schematic diagram of the magnetic core of FIG. 1, showing the magnetic flux and several cells, each containing one full turn, arranged around a portion of the magnetic path surrounding the magnetic core. 3 illustrates one embodiment having a magnetic core including two windings according to the teachings of the present invention, each of the windings including at least one cell with a power switch and a capacitor arranged oppositely, and two other windings that do not or do not have a power switch and a capacitor, one of the windings including one cell of the present invention surrounds one of the windings that does not have a power switch and a capacitor. 4 is a schematic diagram of an embodiment of a power converter with a planar winding structure, for example a transformer winding surrounded by an E-shaped magnetic core, where the winding containing the segments integrating the switches is placed on one side of the magnetic core, the segments containing the capacitors are placed on the other side of the magnetic core, and the connecting segments provide the electrical connection between said segments containing the switches and the capacitors, respectively. FIG. 5 shows a schematic embodiment of a cell A composed of four connection segments, including a first lateral segment including at least one switch, an upper segment composed of a conductor element, a second lateral segment opposite the first lateral segment including at least one capacitor, and a lower segment composed of a conductor element, each of the upper and lower connection segments having conductor elements of opposite electrical polarity. FIG. 6 shows diagrammatically another cell embodiment, where a second cell surrounds both the magnetic path and, for example, the previous cell A. FIG. 7 shows diagrammatically another cell embodiment like that of FIG. 5, further including conductor elements enabling connections between adjacent cells, this cell embodiment enclosing the conductor elements and the magnetic paths. FIG. 8 shows diagrammatically a magnetic core surrounded by a winding in the form of a coil associated with a primary winding and several cells associated with a secondary winding of a power converter, connected in parallel by electrical conductor elements. FIG. 9A is a schematic diagram of a prior art electrical circuit for a power converter. FIG. 9B shows diagrammatically how the proposal of the present invention is achieved by starting from the prior art right-hand circuit and splitting the secondary winding of the transformer into two connected segments and, in the two remaining segments, having switches and capacitors, on the contrary, directly opposite each other. FIG. 9C is a schematic diagram of a cell surrounding a magnetic core associated with a load, and FIG. 9D is a diagram showing two cells connected in parallel by a conductive plate, as shown in the previous embodiment. FIG. 10 shows diagrammatically an embodiment having only one cell 4, including four connected segments, namely a first lateral segment including a switch, a connection segment formed by a conductor element, a second lateral segment opposite the first lateral segment including a capacitor, and a connection segment formed by a conductor element, each of said connection segments having opposite electrical polarity. FIG. 11 illustrates a schematic diagram of an arrangement implementing the principles of the present invention to form a spatial structure having a plurality of switches and capacitors, and in which conductor elements as embodied in this embodiment are implemented by upper and lower conductive plates. FIG. 12 shows an embodiment such as the embodiment disclosed in FIG. 10 in a perspective simplified exploded view. FIG. 13 shows a schematic of an embodiment using the configuration of the embodiment of FIG. 11, in which multiple cells surround a magnetic core, the cells being connected by conductive plates having opposite electrical polarity. FIG. 14 is another embodiment of one winding of a transformer of a power converter of the present invention, having several cells around a magnetic core and a winding that has no switches and no capacitors. 15A-15E show, in perspective and schematic form, portions of an embodiment in which a magnetic core surrounds conductor elements that provide connecting segments that share a central portion. FIG. 16A is a perspective view of a magnetic core in the form of a magnetic core grid. FIG. 16B shows the referenced magnetic core grid having several cells surrounding some sides of the openings in the magnetic core grid and providing at least one capacitor or at least one switch on those opening sides. FIG. 16C corresponds to FIG. 16B and shows several loads housed inside some of the openings in the magnetic core grid (not all openings house a load) and further including upper and lower conductive plates to allow electrical connection between the components (cells and loads). FIG. 16D corresponds to FIG. 16C and shows a further arrangement of multiple switches and capacitors, with an enlarged portion of the magnetic core grid showing the interrelationships between the load, the switches and the capacitors, the latter surrounding the load. 17A and 17B show perspective views of a possible configuration of a power converter that includes one cell (e.g., a secondary winding and output of a converter) that is surrounded by a primary winding having multiple turns and is energized by the cell, which includes multiple switches and another multiple capacitors. FIG. 17C shows in a perspective view a possible configuration of a power converter including two independent setups as described in FIGS. 17A and 17B. FIG. 17D shows in a perspective view a possible construction structure, such as that described in FIG. 17C, in which the primary winding is shared by the two setups and therefore there is a common primary current that energizes both setups simultaneously. FIG. 17E shows in a perspective view a number of setups as described in FIGS. 17A-17D, which can be arranged in a 2D matrix or even in a 3D cube, sharing a primary winding and therefore having the potential to be energized by the same common current. DETAILED DESCRIPTION OF SEVERAL EMBODIMENTS DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The principles of the present invention can be better understood with reference to Figures 10, 11 and 12, which illustrate a primary winding 51 or a secondary winding 52 of a power converter 2 (a possible circuit arrangement of such a power converter 2 is shown in Figure 9B, which implements it). One such power converter includes a transformer or autotransformer including a magnetic core 3 and a primary winding 51 and a secondary winding 52 arranged around the magnetic core 3, with both the at least one primary winding 51 and the at least one secondary winding 52 having at least one cell 4 including one full turn. According to the invention, at least one cell 4 of the primary winding 51 and / or the secondary winding 52 is arranged opposite each other and comprises at least one capacitor 12 and at least one power switch 10 facing opposite (or both) sides of the magnetic core 3, whereby the cell 4 is divided into four segments, namely a first segment 23 comprising said at least one switch 10, a second directly opposite segment 24 comprising said at least one capacitor 12, the first segment 23 and the second segment 24 and other connection segments 21, 22 intended to provide an electrical connection between the first segment 23 and the second segment 24, each of the other connection segments 21, 22 having an opposite electrical polarity (see in this respect the diagram in FIG. 10).

[0020] In a general embodiment of the invention, the primary winding 51 and / or secondary winding 52 of the transformer or autotransformer of the power converter 2 comprises several cells 4 (see FIG. 2 ), each cell 4 comprising one or more capacitors 12 and one or several switches 10 spatially arranged as shown, the cells 4 belonging to (or related to) the same winding 51, 52 being connected in parallel, whereby the current capability of the power converter 2 is adjustable. The number of switches 10 or capacitors 12 integrated in one cell 4 may be any number and may not be equal.

[0021] Such an arrangement of switches 10 and capacitors 12 is opposite each other on either side of the magnetic core 3 so that a load 41 can be inserted between and adjacent to the magnetic core 3 and can be supplied from connection segments 21, 22 having different electrical polarities.

[0022] As shown in FIGS. 17A to 17C, the magnetic core 3 can adopt different configurations such that in the embodiment shown, the magnetic core 3 surrounds one segment 23 which includes several switches 10.

[0023] In an alternative embodiment, the magnetic core extends around one segment 24 that comprises several capacitors 12 .

[0024] In yet another embodiment, the magnetic core may surround connecting segments 21, 22 that provide an electrical connection between segments 23 and 24 that contain switch 10 and capacitor 12, respectively, as in the embodiment of Figures 15A-15E described below.

[0025] In the embodiment shown in FIG. 3, the magnetic core 3 further comprises an additional winding 60 without the power switch 10 and the capacitor 12 .

[0026] FIG. 4 shows an embodiment of a power converter 2 having a segment 23 including a switch 10 surrounded by an E-shaped magnetic core 3, and a segment 24 including a capacitor 12 also surrounded by the E-shaped magnetic core 3 and positioned opposite the switch 10, with the segment 23 including the switch 10 and the segment 24 including the capacitor 12 being connected to conductors passing through the spaces in each window of the magnetic core 3.

[0027] FIG. 5 shows diagrammatically an embodiment of a cell 4, in which the cell 4 is composed of four segments 21, 22, 23 and 24, including a first lateral segment 23 integrating at least one switch 10 and a second lateral segment 24 integrating at least one capacitor 12, these two segments 23, 24 facing each other and arranged on either side of the magnetic core 3, the upper segment 21 and the lower segment 22 being constituted by conductor elements providing an electrical connection between the first segment 23 and the second segment 24.

[0028] FIG. 6 shows diagrammatically a particular spatial arrangement in which cells 4 associated with (or belonging to) either the primary winding 51 or the secondary winding 52 of the power converter 2 surround cells 4 of another winding, whereby the leakage energy and leakage inductance of the magnetic elements are adjustable.

[0029] Figure 7 shows diagrammatically another cell 4 embodiment like that of the cell of Figure 5, further comprising a conductor element 11 enabling an electrical connection between adjacent cells 4 (see Figure 8). This cell 4 embodiment includes the conductor element 11 and the magnetic path of the magnetic core 3.

[0030] Figure 8 shows diagrammatically a magnetic core 3 surrounded by a primary winding 60 (in the form of a coil) and several cells 4 connected in parallel and forming a secondary part 52 of a transformer or autotransformer of a power converter 2. The cells 4 are electrically connected by conductor elements 11 (as shown in Figure 7). In this embodiment, the turns of the different windings 60 and 52 are interleaved, whereby the leakage energy and leakage inductance of the magnetic element are adjustable.

[0031] Figure 9B shows an embodiment of the invention in which, with respect to the prior art (Figure 9A), the secondary winding 52 of the transformer is split into two parts and the switches 10 and the capacitors 12 of the circuit are arranged oppositely to provide a cell 4 and a load 41 fed from the two split windings. In Figure 9C, a magnetic core 3 is shown surrounded by four segments 21, 22, 23 and 24 of a cell 4. A further development of the structure appears in Figure 9D, where two cells 4 are connected in parallel by two conductive plates 42 and 43.

[0032] Figures 15B and 15C show in perspective view the different parts of an embodiment in which the magnetic core 3 (see Figure 15A) is arranged surrounding an inner elongated connecting portion providing two attached connection segments 22 opposite a corresponding outer connection segment 21, each of which (connection segments 22) is also made by an elongated connecting portion. Each of the cited elongated portions includes a passage 75 through which an electrical connection piece 76 extends so that a winding 51, 52 is formed, oppositely including a switch 10 and a capacitor 12 according to the invention (see Figure 15E).

[0033] 16A-16D show an embodiment in which several interconnected cells 4 encompass different magnetic paths. According to FIG. 16D, in a magnified view, the magnetic core 3 comprises a magnetic core grid 13 with a number of openings 40, some of which contain a capacitor 12 associated with one of said interconnected cells 4, the capacitor 12 being arranged on the side of the opening 40 (which may contain one or more capacitors 12). The opening 40 with the capacitor 12 further accommodates a load 41 (which may be an electronic semiconductor circuit), the magnetic core grid 13 further comprising a power switch 10 of said interconnected cell 4 arranged in another adjacent opening 40 on the side of the other adjacent opening 40. As shown in FIG. 16D, the load 41 receives energy from conductive plates 42, 43 with opposite electrical polarity, forming an assembly of magnetic core grids 13 sandwiched between said conductive plates 42, 43. This assembly of magnetic core grids 13 is integrated in an electronic board or a multi-layer electronic stack. In an alternative embodiment, the assembly of magnetic core grids 13 is integrated in an electronic semiconductor circuit.

[0034] 17A and 17B show in perspective and schematic view one constructive embodiment in which a number of switches 10 of a cell 4 are integrated on a first electronic board 71, a number of capacitors 12 of the same cell 4 are integrated on a second electronic board 72, and the cell 4 of the winding includes a separate independent winding 60 included on one of the electronic boards 71, 72 or between them (as previously shown in FIG. 6).

[0035] 17C and 17D show perspective views of a portion of a power converter 2 including multiple cells 4 of a secondary winding connected in parallel, the secondary winding being arranged in a configuration in which some or all of the cells 4 are energized by each of the primary windings, as indicated by reference numeral 60.

[0036] In the alternative embodiment of FIG. 17D, several or all of the cells 4 are energized simultaneously by a common current of a single primary winding, indicated by reference numeral 60, which creates current loops perpendicular or parallel to the induced currents in the secondary windings of the cells 4.

[0037] Fig. 17E shows another embodiment having multiple cells 4 of secondary windings connected in parallel arranged in a 3D configuration at several relative positions in space. As with the previous embodiment of Fig. 17D, the cells 4 may be energized by one primary winding associated with each of them or may be energized simultaneously by a common current of a single primary winding, indicated by reference numeral 60, which creates a current loop perpendicular or parallel to the induced current in the secondary windings of the cells 4. The following is an invention described at the beginning of the present application. <Claim 1> A power converter (2) comprising a transformer or autotransformer including a magnetic core (3) and at least one primary winding (51) and at least one secondary winding (52) arranged around the magnetic core (3), the primary winding (51) and / or the secondary winding (52) are connected in series and each have at least one full turn arranged opposite each other and including at least one power switch (10) and at least one capacitor (12) facing opposite sides of a magnetic core (3), defining a cell (4) that is divided into four segments, the four segments being a first segment (23) including the at least one switch (10), a second opposing segment (24) including the at least one capacitor (12), and two other connection segments (21, 22) providing an electrical connection between the first segment (23) and the second segment (24), each of the two other connection segments (21, 22) having an opposite electrical polarity. <Claim 2> 2. The power converter (2) of claim 1, wherein the magnetic core (3) surrounds one segment (23) comprising at least one switch (10), surrounds one segment (24) comprising at least one capacitor (12), or surrounds one of the connection segments (21, 22) and provides electrical connection of the at least one cell (4). <Claim 3> 2. The power converter (2) of claim 1, wherein the primary winding (51) and / or the secondary winding (52) comprises several cells (4), each cell (4) comprising at least one switch (10) and at least one capacitor (12), and wherein the cells (4) belonging to the same winding are connected in parallel. <Claim 4> 4. The power converter (2) according to any one of claims 1 to 3, wherein the magnetic core (3) further comprises at least another winding (60) having no power switch (10) and no capacitor (12). <Claim 5> 4. The power converter (2) of claim 3, wherein the at least one switch (10) and the at least one capacitor (12) of the several cells (4) are connected by at least two conductive plates (42, 43) surrounding a magnetic core (3), the conductive plates (42, 43) providing the connection segments (21, 22). <Claim 6> 6. A power converter (2) according to any one of claims 1 to 5, embodied as a DC / DC or AC / AC or AC / DC power converter. <Claim 7> 7. A power converter (2) according to any of the preceding claims, wherein the turns of the different windings (51, 52, 60) are interleaved, whereby the leakage energy and leakage inductance of the magnetic elements are adjustable. <Claim 8> 8. A power converter (2) as claimed in any one of claims 1 to 7, wherein a cell (4) of either the primary winding (51) or the secondary winding (52) surrounds a cell (4) of another winding, thereby making it possible to adjust leakage energy and leakage inductance of magnetic elements. <Claim 9> 6. The power converter (2) of claim 5, further comprising several interconnected cells (4), different cells (4) enclosing different magnetic paths (7). <Claim 10> 10. The power converter (2) of claim 9, wherein the magnetic core (3) includes a magnetic core grid (13) having a plurality of openings (40), some of which include capacitors (12) belonging to one of the interconnected cells (4), the capacitors (12) being arranged on a side of the openings (40), the openings (40) having these capacitors (12) further housing a load (41), and the magnetic core grid (13) further includes in another adjacent opening (40) a power switch (10) of a cell (4) having the capacitor (12), arranged on the side of the other adjacent opening (40). <Claim 11> 11. The power converter (2) of claim 10, wherein the load (41) receives energy from the conductive plates (42, 43) having opposite electrical polarity and forming an assembly of a magnetic core-grid (13) sandwiched between the conductive plates (42, 43). <Claim 12> 12. The power converter (2) of claim 11, wherein the magnetic core-grid (13) assembly is integrated into an electronic board or a multi-layer electronic stack. <Claim 13> 12. The power converter (2) of claim 11, wherein the magnetic core-grid (13) assembly is integrated into an electronic semiconductor circuit. <Claim 14> The power converter (2) of claim 10, wherein the load (41) comprises an electronic semiconductor circuit. <Claim 15> 15. A power converter (2) according to any one of claims 1 to 14, wherein the segment (23) of the at least one cell (4) comprising at least one switch (10) is integrated on a first electronic board (71), the second segment (24) of the at least one cell (4) comprising at least one capacitor (12) is integrated on a second electronic board (72), and the connection segments (21, 22) of the cell (4) are at least partially arranged on one of the electronic boards (71, 72) or as independent components. <Claim 16> 16. A power converter (2) according to any one of claims 1 to 15, wherein a plurality of cells (4) of at least one secondary winding (52) are arranged in a 2D or 3D structure at several relative positions in space, at least some of them being driven and simultaneously energized or energized by a respective one primary winding (51) by a common current of a single primary winding (51) generating a current loop perpendicular or parallel to the induced current in the secondary winding (52) of the cell (4).

Claims

1. A power converter (2) comprising a transformer or autotransformer including a magnetic core (3) and at least one primary winding (51) and at least one secondary winding (52) arranged around the magnetic core (3), the primary winding (51) and / or the secondary winding (52) are connected in series and each have at least one full turn arranged opposite each other and including at least one power switch (10) and at least one capacitor (12) facing opposite sides of a magnetic core (3), defining a cell (4) that is divided into four segments, the four segments being a first segment (23) including the at least one switch (10), a second opposing segment (24) including the at least one capacitor (12), and two other connection segments (21, 22) providing an electrical connection between the first segment (23) and the second segment (24), each of the two other connection segments (21, 22) having an opposite electrical polarity.

2. 2. The power converter (2) of claim 1, wherein the magnetic core (3) surrounds one segment (23) comprising at least one switch (10), surrounds one segment (24) comprising at least one capacitor (12), or surrounds one of the connection segments (21, 22) and provides electrical connection of the at least one cell (4).

3. 2. The power converter (2) of claim 1, wherein the primary winding (51) and / or the secondary winding (52) comprises several cells (4), each cell (4) comprising at least one switch (10) and at least one capacitor (12), and wherein the cells (4) belonging to the same winding are connected in parallel.

4. The power converter (2) according to any one of claims 1 to 3, wherein the magnetic core (3) further comprises at least another winding (60) without a power switch (10) and a capacitor (12).

5. 4. The power converter (2) of claim 3, wherein the at least one switch (10) and the at least one capacitor (12) of the several cells (4) are connected by at least two conductive plates (42, 43) surrounding a magnetic core (3), the conductive plates (42, 43) providing the connection segments (21, 22).

6. A power converter (2) according to any of the preceding claims, embodied as a DC / DC or AC / AC or AC / DC power converter.

7. A power converter (2) according to any of the preceding claims, wherein the turns of the different windings (51, 52, 60) are interleaved, whereby the leakage energy and leakage inductance of the magnetic elements are adjustable.

8. A power converter (2) according to any one of claims 1 to 7, wherein a cell (4) of either the primary winding (51) or the secondary winding (52) surrounds a cell (4) of another winding, whereby leakage energy and leakage inductance of magnetic elements are adjustable.

9. 6. The power converter (2) according to claim 5, further comprising several interconnected cells (4), different cells (4) enclosing different magnetic paths (7).

10. 10. The power converter of claim 9, wherein the magnetic core (3) comprises a magnetic core grid (13) having a plurality of openings (40), some of which contain capacitors (12) belonging to one of the interconnected cells (4), the capacitors (12) being arranged on a side of the openings (40), the openings (40) with these capacitors (12) further housing a load (41) including an electric semiconductor circuit, and the magnetic core grid (13) further comprises in another adjacent opening (40) a power switch (10) of a cell (4) having the capacitor (12), arranged on the side of the other adjacent opening (40).

11. 11. The power converter (2) of claim 10, wherein the load (41) receives energy from the conductive plates (42, 43) having opposite electrical polarity and forming an assembly of a magnetic core-grid (13) sandwiched between the conductive plates (42, 43).

12. The power converter (2) of claim 11, wherein the magnetic core-grid (13) assembly is integrated into an electronic board or a multi-layer electronic stack.

13. The power converter (2) of claim 11, wherein the magnetic core-grid (13) assembly is integrated into an electronic semiconductor circuit.

14. A power converter (2) according to any one of claims 1 to 13, wherein the segment (23) of the at least one cell (4) comprising at least one switch (10) is integrated on a first electronic board (71), the second segment (24) of the at least one cell (4) comprising at least one capacitor (12) is integrated on a second electronic board (72), and the connection segments (21, 22) of the cell (4) are at least partially arranged on one of the electronic boards (71, 72) or as independent components.

15. A power converter (2) according to any one of claims 1 to 14, wherein a plurality of cells (4) of at least one secondary winding (52) are arranged in a 2D or 3D structure at several relative positions in space, at least some of them being driven, simultaneously energized or energized by a respective one primary winding (51), by a common current of a single primary winding (51) generating a current loop perpendicular or parallel to the induced current in the secondary winding (52) of the cell (4).

Images