A multi-winding transformer and multi-port power converter

Abstract

The application discloses a multi-winding transformer and a multi-port power converter, and relates to the technical field of power electronics. The magnetic core structure of the multi-winding transformer comprises a plurality of magnetic columns, and each magnetic column is wound with the following: part of a coil of a main port winding, and at least part of a coil of at least one secondary port winding, so that the power coupling relationship between the main port winding and each secondary port winding is good; and the magnetic flux generated by any secondary port winding on other secondary port windings is less than a preset threshold, so that coupling between each secondary port winding is avoided as much as possible, the power coupling degree between each secondary port winding is reduced, power loss is reduced, the working efficiency of the multi-winding transformer is improved, and the volume of the multi-winding transformer is reduced. In addition, the multi-winding transformer adopting hardware decoupling can reduce the software control difficulty of the multi-port power converter.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a multi-winding transformer and a multi-port power converter. Background Technology

[0002] In recent years, with the popularization of new energy sources, the research on multi-winding transformers has received widespread attention. Multi-winding transformers have advantages such as high power density, electrical isolation, flexible energy dispatch, and wide range of applications. However, when a multi-winding transformer is working, due to the common magnetic core of each winding, there is a power coupling problem between the port circuits connected to each winding.

[0003] In related technologies, power coupling problems are solved by using external compensation resonant inductors and capacitors or by employing complex software phase-shifting control schemes. However, as the number of port circuits increases, system parameter design becomes more complex, decoupling control becomes more difficult, and it becomes hard to achieve power decoupling between multiple port circuits, which in turn leads to unnecessary power loss. Summary of the Invention

[0004] In view of the above problems, this application provides a multi-winding transformer and a multi-port power converter to reduce power coupling and power loss through hardware settings. The specific solution is as follows:

[0005] The first aspect of this application provides a multi-winding transformer, comprising: a magnetic core structure and multiple windings; wherein...

[0006] The magnetic core structure includes multiple magnetic pillars; each magnetic pillar is connected by an upper yoke core and a lower yoke core, or each magnetic pillar independently forms a magnetic flux loop;

[0007] The plurality of windings includes: a primary port winding, and at least two secondary port windings;

[0008] Each of the magnetic pillars is wound with: a portion of the main port winding, and at least a portion of the secondary port winding;

[0009] The magnetic flux generated by any of the secondary port windings to the other secondary port windings is less than a preset threshold.

[0010] In one possible implementation, the magnetic flux generated by any of the secondary port windings to the other secondary port windings is zero.

[0011] In one possible implementation, the main port winding includes: at least two sub-windings connected in parallel; and at least a portion of the coil of one of the sub-windings is wound on each of the magnetic posts.

[0012] In one possible implementation, the magnetic pillars are connected together, then:

[0013] Each of the magnetic pillars is wound with at least a portion of the coil of one of the sub-windings, and at least a portion of the coil of one of the secondary port windings;

[0014] The number of magnetic pillars is even, and each magnetic pillar has another magnetic pillar that is symmetrical about the central axis; or the number of magnetic pillars is odd, wherein there is at least one pair of magnetic pillars that are symmetrical about the central plane, and a magnetic pillar that is itself symmetrical about the central plane.

[0015] In one possible implementation, the same winding has the same number of turns wound on the magnetic post symmetrical about the central axis or the central plane, and the ratio of the number of turns of different windings wound on each magnetic post is equal to the ratio of the number of turns of the corresponding two windings.

[0016] In one possible implementation, there are at least two magnetic pillars, on which the number of turns of each winding is half the number of turns of the corresponding winding.

[0017] In one possible implementation, there is at least one of the secondary port windings, with half of the coil turns and the other half of the coil turns wound on the magnetic pillars on both sides of the central axis or the central plane, and the winding directions of the coils on the two symmetrical magnetic pillars are symmetrical.

[0018] The main port winding includes at least two parallel sub-windings, and there is at least one sub-winding in which half of the turns of the coil and the other half of the turns of the coil are wound on the magnetic pillars on both sides of the central axis or the central plane, and the winding directions of the coils on the two symmetrical magnetic pillars are symmetrical.

[0019] In one possible implementation, the entire coil of the secondary port winding is wound on the magnetic post, which is symmetrical about the central plane.

[0020] The main port winding includes at least two parallel-connected sub-windings, and all the coils of one of the sub-windings are wound on the magnetic post symmetrical about the central plane.

[0021] In one possible implementation, there is also at least one pair of magnetic posts symmetrical about the central axis or the central plane, on which all the coils of the secondary port winding and all the coils of the sub-winding are wound together.

[0022] In one possible implementation, each of the magnetic pillars independently forms a magnetic flux loop, the number of magnetic pillars is even, the main port winding includes at least two parallel-connected sub-windings, each of the sub-windings is wound with a corresponding secondary port winding in the same winding direction on at least one pair of magnetic pillars, and: the winding directions of different secondary port windings are the same on at least one magnetic pillar, and the winding directions are opposite on the same number of other magnetic pillars.

[0023] A second aspect of this application provides a multi-port power converter, characterized in that it includes: a controller, multiple port circuits, and a multi-winding transformer as described in the first aspect or any implementation thereof; wherein...

[0024] Each winding of the multi-winding transformer is connected to a first side corresponding to the port circuit;

[0025] The second side of each of the aforementioned port circuits is used to connect a power source or a load;

[0026] Each of the port circuits is controlled by the controller.

[0027] In one possible implementation, each of the port circuits is: a main port circuit, and at least two secondary port circuits;

[0028] The first side of the main port circuit is connected to the main port winding in the multi-winding transformer.

[0029] The first side of the secondary port circuit is connected to the secondary port winding of the multi-winding transformer.

[0030] In one possible implementation, the controller is used to adjust the first-side voltage phase difference between any of the secondary port circuits and the primary port circuit to achieve power transfer between them.

[0031] In one possible implementation, the controller is used to adjust the first-side voltage phase difference between the two secondary port circuits and the main port circuit, respectively, to achieve power transfer between the two secondary port circuits.

[0032] In one possible implementation, when the controller controls the power transfer between the two secondary port circuits, it is specifically configured to: adjust the first-side voltage phase of one of the secondary port circuits to lead the first-side voltage phase of the main port circuit, and adjust the first-side voltage phase of the other secondary port circuit to lag the first-side voltage phase of the main port circuit, so that the power transferred by the two secondary port circuits to the main port circuit is the same in magnitude and opposite in direction.

[0033] In one possible implementation, the port circuit includes an AC / DC conversion circuit; the AC side of the AC / DC conversion circuit serves as the first side of the port circuit, and the DC side of the AC / DC conversion circuit serves as the second side of the port circuit.

[0034] In one possible implementation, the port circuit further includes: a DC / AC conversion circuit or a DC / DC conversion circuit;

[0035] The DC side of the DC / AC conversion circuit is connected to the DC side of the AC / DC conversion circuit, and the AC side of the DC / AC conversion circuit serves as the second side of the port circuit.

[0036] The DC / DC converter circuit is connected between the DC side of the AC / DC converter circuit and the second side of the port circuit.

[0037] By means of the above technical solution, the multi-winding transformer provided in this application has a core structure including multiple magnetic pillars, each magnetic pillar having a portion of the coil of the main port winding and at least a portion of the coil of at least one secondary port winding wound on it, so that the power coupling relationship between the main port winding and each secondary port winding is good; and the magnetic flux generated by any primary port winding to other secondary port windings is less than a preset threshold, so that there is as little coupling as possible between the secondary port windings, reducing the power coupling degree between the secondary port windings, reducing power loss, and improving the working efficiency of the multi-winding transformer. Attached Figure Description

[0038] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0039] Figure 1 A schematic diagram of a multi-port power converter provided for related technologies;

[0040] Figure 2 This is a schematic diagram of a multi-winding transformer provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the core structure in a multi-winding transformer provided in an embodiment of this application;

[0042] Figure 4 Another structural schematic diagram of a multi-winding transformer provided in an embodiment of this application;

[0043] Figure 5 Another structural schematic diagram of a multi-winding transformer provided in an embodiment of this application;

[0044] Figure 6 Another structural schematic diagram of a multi-winding transformer provided in an embodiment of this application;

[0045] Figure 7 Another structural schematic diagram of a multi-winding transformer provided in an embodiment of this application;

[0046] Figure 8 A schematic diagram of a multi-port power converter provided in an embodiment of this application;

[0047] Figure 9 A circuit diagram of a multiport power converter provided in an embodiment of this application. Detailed Implementation

[0048] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0049] The embodiments of this application are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Those skilled in the art will understand that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0050] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0051] Multi-winding transformers, suitable for AC / DC hybrid distribution networks, are often connected to multiple port circuits; such as Figure 1 As shown, m port circuits are coupled together through a multi-winding transformer T, which serves as both an isolation mechanism and a bidirectional power coupling element. Figure 1In the structure shown, port circuits #1 to #m are respectively connected to one of the corresponding windings in the multi-winding transformer T, where m is a positive integer greater than 1. For Figure 1 The structure shown allows power to be transferred between any port circuits; however, because all windings share a common core, power coupling exists between the port circuits, leading to unnecessary power losses. To achieve power decoupling, compensating resonant inductors and capacitors can be connected between the windings and the port circuits, or a complex software phase-shifting control scheme can be used. However, the larger the value of m, the more complex the coupling relationship between the port circuits becomes, making hardware-based power decoupling difficult to achieve at present; furthermore, power coupling also affects the dynamic and steady-state performance of the control system, thus a larger value of m also makes the control system more complex.

[0052] This application provides a multi-winding transformer to reduce power coupling and power loss through hardware settings. The specific solution is as follows:

[0053] This multi-winding transformer includes: a magnetic core structure and multiple windings; wherein:

[0054] like Figure 2 As shown, the magnetic core structure includes: multiple magnetic pillars (101, 102, and 103 as shown in the figure); each magnetic pillar is connected to... Figure 2 The upper yoke core 201 and the lower yoke core 202 shown are connected, that is, the upper and lower yoke cores 201 and 202 are used to connect all the magnetic pillars so that each magnetic pillar can form a complete magnetic flux loop; or, each magnetic pillar can form a magnetic flux loop independently, for example, each magnetic pillar can be a square-shaped magnetic pillar, but it is not limited to this.

[0055] The multi-winding transformer may include: one primary port winding, and at least two secondary port windings. This embodiment does not limit the number of windings m. Figure 2 The example shown uses m=3. Figure 2 As shown, the windings are: main port winding N1 (including N11 and N12 in the figure) and two secondary port windings N2 and N3; wherein, the two sub-windings N11 and N12 included in the main port winding N1 are connected in parallel.

[0056] Each magnetic post is wound with: a portion of the main port winding, and at least a portion of the secondary port winding; wherein, the portion of the main port winding can be a portion or all of the windings of any sub-winding within that winding; the at least a portion of the secondary port winding can be a portion or all of the windings of that winding. For example, each magnetic post can be wound with: at least a portion of the sub-winding, and at least a portion of the winding corresponding to a secondary port winding; see details [link to relevant documentation]. Figure 2 , Figure 2The windings are arranged from left to right. The first magnetic post 101 has half of the sub-winding N11 of the main port winding N1, coil N11 / 2, and half of the corresponding secondary port winding N2, coil N2 / 2, wound on it. The second magnetic post 102 has the sub-winding N12 of the main port winding N1 and all of the coils of the corresponding secondary port winding N3 wound on it. The third magnetic post 103 has the other half of the sub-winding N11 of the main port winding N1, coil N11 / 2, and the other half of the corresponding secondary port winding N2, coil N2 / 2, wound on it.

[0057] Furthermore, the magnetic flux generated by any one secondary port winding to the other secondary port windings is less than a preset threshold. The value of this preset threshold is not limited, as long as it minimizes the magnetic flux generated by any one secondary port winding to the other secondary port windings. In practical applications, the smaller the magnetic flux generated by any one secondary port winding to the other secondary port windings, the worse the power coupling relationship between them. For example, in practical applications, the magnetic flux generated by any one secondary port winding to the other secondary port windings can be set to zero.

[0058] by Figure 2 Taking the winding configuration shown as an example, the secondary port winding N2 is divided into two coils connected in series: one half, N2 / 2, wound on the first magnetic post 101, and the other half, N2 / 2, wound on the third magnetic post 103. The winding directions of the two coils on their respective magnetic posts are symmetrical. Assuming that the winding direction of the secondary port winding N3 is the same as that of the coil N2 / 2 on the first magnetic post 101, the direction of the magnetic field generated when there is a current in the secondary port winding N3 with the same winding direction will be as shown by the dashed line with arrows in the figure. If the first magnetic post 101 and the third magnetic post 103 are perfectly symmetrical in the magnetic core structure, the magnetic flux generated by the coil N2 / 2 on the third magnetic post 103 of the secondary port winding N3 is positive ΔΦ, and the magnetic flux generated by the coil N2 / 2 on the first magnetic post 101 is negative ΔΦ. Therefore, it can be concluded that the magnetic flux generated by the secondary port winding N3 is zero for the entire secondary port winding N2, which is less than the preset threshold. Conversely, if the winding direction of the secondary port winding N3 is the same as that of the coil N2 / 2 on the third magnetic post 103, the direction of the magnetic field generated when a current flows through the secondary port winding N3 in the same direction as the winding will be as shown by the solid line with arrows in the figure; however, based on the same principle, the magnetic flux generated by the secondary port winding N3 is still zero for the entire secondary port winding N2. Similarly, the magnetic flux generated by the two half-coils N2 / 2 on the first magnetic post 101 and the third magnetic post 103 on the secondary port winding N3 will cancel each other out; therefore, it can be concluded that there is no coupling between the two secondary port windings N2 and N3.

[0059] In practical applications, the magnetic pillars wound with different parts of the same winding are not necessarily arranged symmetrically in the core structure; the number of turns of the coil wound on the symmetrical magnetic pillars is not necessarily half the number of turns of the same winding, for example, it can be 1 / 4 or 1 / 6 of the number of turns of the same winding, etc. In addition to allowing process errors, it is also allowed for the secondary port winding to be divided into even-numbered coils such as four or six segments connected in series, and even for odd-numbered coils such as three or five segments connected in series, with each segment wound on a different magnetic pillar, and the number of turns of each segment is not limited; as long as the winding directions of each segment are not exactly the same, so that the magnetic flux generated by any primary port winding to other secondary port windings is less than the preset threshold, the power coupling relationship between the secondary port windings can be ensured to be poor, thereby reducing unnecessary power loss.

[0060] In addition, such as Figure 2 As shown, the sub-winding N11 is also divided into two series-connected coils with the same number of turns and symmetrical winding direction. This sub-winding N11 is connected in parallel with the sub-winding N12 on the middle second magnetic post 102 to form the main port winding N1. Although based on the above principle, it can be concluded that there is no coupling between the sub-winding N11 and the secondary port winding N3, there is a good coupling relationship between the sub-winding N12 and the secondary port winding N3. Therefore, the overall coupling relationship between the main port winding N1 and the secondary port winding N3 is good. Similarly, the overall coupling relationship between the main port winding N1 and the secondary port winding N2 is also good. Therefore, in practical applications, the main port winding of the multi-winding transformer can be set to include at least two parallel-connected sub-windings, so that the secondary port winding coils on each magnetic post can be equipped with corresponding main port winding N1 coils.

[0061] From the above analysis, we can conclude that Figure 2 The coupling relationship between the main port winding N1 and the two secondary port windings N2 and N3 is good, while the coupling relationship between the two secondary port windings N2 and N3 is poor, which can achieve power decoupling of this three-winding transformer. When the value of m is larger, the same conclusion can be obtained based on the same principle, as illustrated in the examples below.

[0062] The multi-winding transformer provided in this embodiment, through the above-described principle, achieves good power coupling between the main port winding and each secondary port winding, and minimizes coupling between the secondary port windings, thereby reducing the power coupling degree between the secondary port windings, reducing power loss, and improving the working efficiency of the multi-winding transformer. In addition, compared with multi-winding transformers that cannot achieve hardware decoupling, this embodiment can also reduce the size of the multi-winding transformer and increase the power density.

[0063] Moreover, this embodiment uses hardware to achieve power decoupling, which can also reduce the difficulty of software control of the system.

[0064] Based on the previous embodiment, this embodiment provides some optional examples of the specific structural configuration of the multi-winding transformer, such as:

[0065] When the magnetic pillars are connected, each magnetic pillar may be wound with at least a portion of the coil of a sub-winding and at least a portion of the coil of a corresponding secondary port winding; moreover, the number of magnetic pillars n can be an odd number, wherein there is at least one pair of magnetic pillars symmetrical about the central plane, and a magnetic pillar that is itself symmetrical about the central plane.

[0066] Figure 2 The demonstration uses an example of 3 magnetic pillars (n=3). Additionally... Figure 2 The magnetic pillars in the core are all in the same plane, so the core structure is not only symmetrical about a central plane, but also about the central axis shown in the figure.

[0067] Figure 3 We will also use n=3 as an example for demonstration, but Figure 3 The three magnetic pillars 101 to 103 are located in different planes, making the overall magnetic core structure more three-dimensional; assuming Figure 3 The winding distribution method of each winding to the magnetic post and Figure 2 The same applies to the following: a set of coils N11 / 2 and N2 / 2 are wound on the first magnetic post 101, a sub-winding N12 and a secondary port winding N3 are wound on the second magnetic post 102, and another set of coils N11 / 2 and N2 / 2 are wound on the third magnetic post 103. Then the first magnetic post 101 and the third magnetic post 103 are symmetrical about the central plane, and the second magnetic post 102 itself is also symmetrical about the central plane.

[0068] Figure 4 The example shown uses n=5 magnetic pillars all lying in the same plane. Each magnetic pillar is symmetrical about the central axis shown in the diagram, and also about the central plane that passes through this central axis and is perpendicular to the plane containing each magnetic pillar. In practical applications, when n=5, the structure of each magnetic pillar can also adopt other more three-dimensional forms, such as a cube including four side pillars and one central pillar, which will not be shown here.

[0069] The structure settings for n taking larger odd numbers can be deduced similarly, and will not be shown one by one.

[0070] In addition, among the n magnetic pillars, two magnetic pillars that are symmetrical about the central plane or central axis have the same structure and material, that is, the same magnetic resistance; at least part of the coil of the secondary port winding and part of the coil of the primary port winding are wound on the two symmetrical magnetic pillars, and the winding direction of the coils on the corresponding two magnetic pillars is also symmetrical about the central plane or central axis.

[0071] In one example, there is at least one secondary port winding, where half of the turns of the coil and the other half of the turns are wound on magnetic pillars on either side of the central axis or central plane, respectively. The coils wound on the two symmetrical magnetic pillars have the same number of turns and are wound in symmetrical directions. For example, Figure 2 The secondary port winding N2 shown has half of its turns, N2 / 2, wound on symmetrical first magnetic post 101 and third magnetic post 103, respectively; for example, Figure 4 The secondary port winding N2 shown has half of its turns, coil N2 / 2, and the other half of its turns, coil N2 / 2, wound on symmetrical first magnetic post 101 and fifth magnetic post 105, respectively; while Figure 4 The secondary port winding N3 shown has half of its turns, coil N3 / 2, wound on symmetrical second magnetic post 102 and fourth magnetic post 104, respectively. The two halves of the same winding are connected in series.

[0072] Furthermore, there exists at least one sub-winding, in which half of the coil's turns are wound on magnetic pillars on either side of the central axis or central plane, and the coils wound on the two symmetrical magnetic pillars have the same number of turns and are wound in symmetrical directions. For example, Figure 2 The sub-winding N11 shown has half-turn coil N11 / 2 and the other half-turn coil N11 / 2 wound on symmetrical first magnetic post 101 and third magnetic post 103, respectively; for example, Figure 4 The sub-winding N11 shown has half-turn coil N11 / 2 and the other half-turn coil N11 / 2 wound on symmetrical first magnetic post 101 and fifth magnetic post 105, respectively; while Figure 4 The sub-winding N12 shown has half of its turns, coil N12 / 2, and the other half of its turns, coil N12 / 2, wound on symmetrical second magnetic post 102 and fourth magnetic post 104, respectively.

[0073] Additionally, on a magnetic post symmetrical about its center plane, all the coils of a secondary port winding and all the coils of a sub-winding are wound. For example, Figure 2 The second magnetic post 102 shown is wound with all the coils of the secondary port winding N3 and all the coils of the sub-winding N12; for example, Figure 4 The third magnetic post 103 shown has all the coils of the secondary port winding N4 and all the coils of the sub-winding N13 wound on it.

[0074] Under the above configuration, the number of turns of each winding on at least two magnetic pillars is half the number of turns of the corresponding winding. Specifically, on two magnetic pillars symmetrical about the central plane or central axis in the core structure, half of the same winding is wound on each. It can be obtained that when the number of magnetic pillars n is odd, the number of windings in this multi-winding transformer is m = (n-1) / 2 + 2.

[0075] In practical applications, the same number of turns of the coil wound on magnetic posts symmetrical about the central axis or central plane ensures that the magnetic flux generated by other windings cancels each other out by symmetrical winding directions. Based on this, to avoid affecting the voltage ratio between windings, it is best to set the ratio of the number of turns of different windings wound on each magnetic post to be equal to the ratio of the number of turns of the corresponding two windings. For example, 1 / 4 turns of the same winding can be wound on symmetrical magnetic posts, in which case two pairs of symmetrically arranged magnetic posts are needed for the corresponding winding, that is, a total of four magnetic posts are required. The smaller the ratio of the number of turns of the same winding wound on symmetrical magnetic posts, the more symmetrical magnetic posts are needed; therefore, the above-mentioned setting of winding half the number of turns of the same winding on symmetrical magnetic posts not only meets the voltage ratio requirements between windings, but also minimizes the number of magnetic posts n.

[0076] by Figure 2 The structure shown illustrates the principle of a three-winding transformer: (e.g.) Figure 2 As shown, the left and right side posts, namely the first magnetic post 101 and the third magnetic post 103, are symmetrical about the central axis. The secondary port winding N2 is divided into two parts, wound on the two side posts respectively, with the same number of turns, symmetrical winding direction, and connected in series. The secondary port winding N3 is wound on the central post, namely the second magnetic post 102 passing through the central axis, with arbitrary winding direction. The magnetic flux generated by the two coils N2 / 2 in the figure cancels out on the central post. Assuming that the secondary port winding N3 has the same winding direction as the left coil N2 / 2, the magnetic flux generated by the secondary port winding N3 on the right coil N2 / 2 is positive ΔΦ, and the magnetic flux generated on the left coil N2 / 2 is negative ΔΦ. That is, the magnetic flux generated by the secondary port winding N3 has no coupling to the entire secondary port winding N2. The sub-winding N11 is connected in series with the same number of turns and symmetrical winding direction on the left and right sides, and is connected in parallel with the middle sub-winding N32. The coupling relationship between the main port winding N1 and the secondary port windings N2 and N3 is good, while the coupling relationship between the secondary port windings N2 and N3 is poor, thus achieving decoupling of the three-winding transformer.

[0077] for Figure 4The five-winding transformer shown has its magnetic posts from left to right as follows: first magnetic post 101, second magnetic post 102, third magnetic post 103, fourth magnetic post 104, and fifth magnetic post 105. The first magnetic post 101 has half of the sub-winding N11 (N11 / 2) and half of the secondary-port winding N2 (N2 / 2) wound on it. The second magnetic post 102 has half of the sub-winding N12 (N12 / 2) and half of the secondary-port winding N3 (N3 / 2) wound on it. The third magnetic post 103 has sub-winding N13 and secondary-port winding N4 wound on it. The fourth magnetic post 104 has the remaining half of the sub-winding N12 (N12 / 2) and the remaining half of the secondary-port winding N3 (N3 / 2) wound on it. The fifth magnetic post 105 has the remaining half of the sub-winding N11 (N11 / 2) and the remaining half of the secondary-port winding N2 (N2 / 2) wound on it. Figure 4 As shown, the magnetic core structure is symmetrical about the central axis, and there is no coupling between the secondary port windings N2, N3, and N4; the main port winding N1 has a good coupling relationship with the secondary port windings N2, N3, and N4 respectively.

[0078] In addition, when the magnetic pillars are connected, the number n of magnetic pillars in the magnetic core structure can also be an even number. In this case, each magnetic pillar has another magnetic pillar that is symmetrical about the central axis.

[0079] Figure 5 Taking n=4 as an example, the magnetic pillars from left to right are: first magnetic pillar 101, second magnetic pillar 102, third magnetic pillar 103 and fourth magnetic pillar 104; among them, the first magnetic pillar 101 and the fourth magnetic pillar 104 are symmetrical about the central axis, and the second magnetic pillar 102 and the third magnetic pillar 103 are symmetrical about the central axis.

[0080] In one example, when the number of magnetic pillars n is even, for each secondary port winding, it can be set such that half of its turns are wound on magnetic pillars on either side of the central axis or central plane, and the number of turns on the two symmetrical magnetic pillars is the same and the winding direction is symmetrical. For example, Figure 5 In the case where n=4, half of the secondary port winding N2, coil N2 / 2, is wound on the leftmost first magnetic post 101, and the other half of the secondary port winding N2, coil N2 / 2, is wound on the rightmost fourth magnetic post 104. The number of turns of both half coils N2 / 2 is half that of the secondary port winding N2. The two half coils N2 / 2 are connected in series and their winding directions are symmetrical about the central axis. Half of the secondary port winding N3, coil N3 / 2, is wound on the left-middle second magnetic post 102, and the other half of the secondary port winding N3, coil N3 / 2, is wound on the right-middle third magnetic post 103. The number of turns of both half coils N3 / 2 is half that of the secondary port winding N3. The two half coils N3 / 2 are connected in series and their winding directions are symmetrical about the central axis.

[0081] Furthermore, there exists at least one sub-winding, in which half of the coil's turns are wound on magnetic pillars on either side of the central axis or central plane, and the coils wound on the two symmetrical magnetic pillars have the same number of turns and are wound in symmetrical directions. For example, Figure 5 In the case where n=4, half of the sub-winding N11, coil N11 / 2, is wound on the leftmost first magnetic post 101, and the other half of the sub-winding N11, coil N11 / 2, is wound on the rightmost fourth magnetic post 104. The number of turns of both half-coils N11 / 2 is half that of the sub-winding N11. The two half-coils N11 / 2 are connected in series and their winding direction is symmetrical about the central axis. Half of the sub-winding N12, coil N12 / 2, is wound on the left-middle second magnetic post 102, and the other half of the sub-winding N12, coil N12 / 2, is wound on the right-middle third magnetic post 103. The number of turns of both half-coils N12 / 2 is half that of the sub-winding N12. The two half-coils N12 / 2 are connected in series and their winding direction is symmetrical about the central axis.

[0082] That is, for a magnetic core structure with an even number of magnetic pillars (n), both magnetic pillars symmetrical about the central axis or central plane have a portion of the main port winding and at least a portion of the secondary port winding. The portions of the same winding on the two symmetrical magnetic pillars are connected in series and have the same number of turns, with the winding direction symmetrical about the central axis or central plane. Moreover, the two symmetrical magnetic pillars maintain the same structure and material, i.e., the same magnetic reluctance.

[0083] Furthermore, when the number of magnetic pillars n is even, and the number of turns of each winding wound on each magnetic pillar is half the number of turns of the corresponding winding, the number of windings in this multi-winding transformer is m = n / 2 + 1. In practical applications, it is not limited to winding half the number of turns of the same winding on symmetrical magnetic pillars. For example, it is possible to simply set the ratio of the number of turns of different windings wound on each magnetic pillar to be equal to the ratio of the number of turns of the corresponding two windings. However, setting up winding half the number of turns of the same winding on symmetrical magnetic pillars can minimize the number of magnetic pillars n.

[0084] In addition, a four-column core structure can be Figure 5 The flat structure shown can also be a more three-dimensional structure, such as a cube with each magnetic pillar as a side pillar. This is not limited here; it depends on the specific application environment. For Figure 5The four-winding transformer shown has a core structure that is symmetrical about the central axis. The left and right half-coils N2 / 2 are connected in series, the left and right half-coils N3 / 2 are connected in series, the left and right half-coils N11 / 2 are connected in series, and the left and right half-coils N12 / 2 are connected in series. The two sub-windings N11 and N12 are connected in parallel to form the main port winding N1. The coil N2 / 2 on the first magnetic post 101 generates a negative magnetic flux ΔΦ1 on the second magnetic post 102 and a positive magnetic flux ΔΦ2 on the third magnetic post 103. The coil N2 / 2 on the fourth magnetic post 104 generates a positive magnetic flux ΔΦ2 on the second magnetic post 102 and a negative magnetic flux ΔΦ1 on the third magnetic post 103. Therefore, the magnetic flux generated by the entire secondary port winding N2 to the other secondary port winding N3 is 0, and there is no coupling. Similarly, the magnetic flux generated by the secondary port winding N3 to the secondary port winding N2 is also 0, that is, there is no coupling between the two secondary port windings N2 and N3. The main port winding N1 has a good coupling relationship with the two secondary port windings N2 and N3, respectively.

[0085] In another example, when the number of magnetic pillars n is even, the winding method on each magnetic pillar can also be different. For example, when n is odd, the coils wound on magnetic pillars that are symmetrical about the central axis or central plane can be changed to be wound together on a pair of symmetrical magnetic pillars. That is, in addition to having at least one pair of magnetic pillars symmetrical about the central axis or central plane, where each magnetic pillar has a portion of a secondary port winding and a portion of a sub-winding wound on it at the same time, there will also be at least one pair of magnetic pillars symmetrical about the central axis or central plane, where each pair of magnetic pillars has all the coils of a secondary port winding and all the coils of a sub-winding wound on it.

[0086] For example, when n=4, the winding method of each winding can also be different. Figure 5 As shown in the figure, please refer to the details. Figure 6 The first magnetic post 101 and the fourth magnetic post 104 are symmetrical about the central axis, and the second magnetic post 102 and the third magnetic post 103 are symmetrical about the central axis. Among them, the first magnetic post 101 has a set of coils N11 / 2 and N2 / 2 wound on it, the second magnetic post 102 and the third magnetic post 103 have a sub-winding N12 and a secondary port winding N3 wound on them together, and the fourth magnetic post 104 has another set of coils N11 / 2 and N2 / 2 wound on it. Figure 6 and Figure 2 The difference lies in the fact that each turn of the sub-winding N12 and the secondary port winding N3 needs to pass around the second magnetic post 102 and the third magnetic post 103. Figure 6 and Figure 5 The difference is that the sub-winding N12 and the secondary port winding N3 no longer need to be divided into two series-connected coils. Figure 6 The working principle of the structure shown can be found in [reference needed]. Figure 2 I will not go into details.

[0087] Furthermore, the cases where the number of magnetic pillars n is a larger even number such as 6 or 8 can be deduced by analogy from the above content, and will not be elaborated further.

[0088] Furthermore, when each magnetic post independently forms a magnetic flux loop, the number of magnetic posts n can be set to an even number. The main port winding includes at least two parallel-connected sub-windings, wherein each sub-winding is wound with a corresponding secondary port winding in the same winding direction on at least one pair of magnetic posts, and: the winding directions of different secondary port windings on at least one magnetic post are the same, and the winding directions on the same number of other magnetic posts are opposite.

[0089] That is, for any given secondary port winding, it will have at least one pair of magnetic posts with a symmetrical winding direction, and other secondary port windings will have the same winding direction as the secondary port winding on half of these magnetic posts, and the opposite winding direction on the other half of these magnetic posts. As a result, the magnetic flux generated by the secondary port winding can cancel each other out, resulting in poor power coupling between them.

[0090] Figure 7 Taking an example with n=m=4, a top view of the magnetic core structure is shown. The four magnetic pillars 101 to 104 are all U-shaped pillars, and each winding is wound on the portion of each pillar that is close to it. Each winding consists of: one main port winding N1 and three secondary port windings N2 to N4; wherein, the main port winding N1 includes three parallel-connected sub-windings N11 to N13. Figure 7 As shown, the secondary port winding N2 is wound on four magnetic posts 101 to 104. The secondary port winding N3 is wound in an α-shape, first around the two left magnetic posts 101 and 102, and then around the two right magnetic posts 103 and 104. The secondary port winding N4 is wound in an α-shape, first around the two bottom magnetic posts 102 and 103, and then around the two top magnetic posts 104 and 101. In addition, the sub-winding N11 is wound in the same way as the secondary port winding N2, the sub-winding N12 is wound in the same way as the secondary port winding N3, and the sub-winding N13 is wound in the same way as the secondary port winding N4.

[0091] for Figure 7In the structure shown, the secondary port windings N2 and N3 are wound in the same direction on the two left magnetic posts 101 and 102, and in opposite directions on the two right magnetic posts 101 and 102. Therefore, when there is current in the secondary port winding N2, the magnetic flux generated on the secondary port winding N3 on the left and right magnetic posts will cancel each other out, and vice versa. Thus, the coupling relationship between the secondary port windings N2 and N3 is relatively poor. Similarly, the magnetic flux generated on each other by the secondary port windings N2 and N4 on the upper and lower magnetic posts will cancel each other out, thus the coupling relationship between the secondary port windings N2 and N4 is relatively poor. The magnetic flux generated on each other by the secondary port windings N3 and N4 on magnetic posts 101 and 104 will cancel each other out with the magnetic flux generated on each other on magnetic posts 102 and 103, thus the coupling relationship between the secondary port windings N3 and N4 is relatively poor. Each port winding is equipped with a sub-winding with the same winding method, which makes the coupling relationship between each port winding and the main port winding better.

[0092] in addition, Figure 7 Each arrowed line segment in the diagram represents the winding direction of the corresponding winding. In practical applications, each winding can be wound multiple times in the direction shown in the diagram to achieve the required number of turns for the corresponding winding. Alternatively, when winding each winding in the direction shown in the diagram, it can also be wound multiple times around the corresponding magnetic post, and then continue winding around the next magnetic post in the direction shown in the diagram. The number of turns of the coil wound on each magnetic post can be determined according to actual needs. As long as the magnetic flux generated by one secondary port winding on another secondary port winding can be canceled out by the above symmetrical winding, power decoupling between the secondary port windings can be achieved.

[0093] The multi-winding transformer provided in this embodiment utilizes a structure in which the winding coils are symmetrically arranged so that the magnetic flux generated between different secondary port windings cancels out at symmetrical positions, thereby achieving a decoupling effect.

[0094] The number of magnetic pillars n, the number of windings m, and the ratio of turns allocated to a single winding on each magnetic pillar can all take other values, and are not limited to the examples mentioned above; the shape of the magnetic core structure is also not limited to... Figures 2 to 6 As shown, any scheme that utilizes the above principle to achieve poor coupling between secondary port windings and good coupling between the main port winding and each secondary port winding is within the protection scope of this application.

[0095] Another embodiment of this application also provides a multi-port power converter, such as... Figure 8 The diagram shows: a controller (not shown), multiple port circuits 10, and a multi-winding transformer T as described in any of the above embodiments; wherein:

[0096] Each winding of the multi-winding transformer T is connected to the first side of a corresponding port circuit 10; such as Figure 8 As shown, winding N1 is connected to port circuit #1, winding N2 is connected to port circuit #2, winding Nm-1 is connected to port circuit #m-1, and winding Nm is connected to port circuit #m. The number of windings m can be determined according to the specific application environment, and is not limited here.

[0097] That is, the m port circuits 10 are coupled together through the multi-winding transformer T, which serves as both isolation and bidirectional power coupling. The structure and principle of the multi-winding transformer T can be found in the above embodiment and will not be repeated here. Using this multi-winding transformer T not only achieves hardware decoupling, but also, compared to multi-winding transformers that cannot achieve hardware decoupling, this embodiment can reduce the size of the multi-winding transformer and increase power density.

[0098] In one example, each port circuit 10 can be: a main port circuit, and at least two secondary port circuits; wherein, the main port circuit (e.g., Figure 8 The first side of the port circuit #1 shown is connected to the main port winding (e.g., in the multi-winding transformer T) of the multi-winding transformer T. Figure 8 N1 as shown is connected; the secondary port circuit (e.g., Figure 8 The first side of any one of the port circuits #2 to #m shown is connected to the secondary port winding of the multi-winding transformer T (e.g., Figure 8 (The corresponding one of N2 to Nm shown in the diagram) is connected.

[0099] Assumption Figure 8 Port circuit #1 shown is the main port circuit, with its first side connected to the main port winding N1 of the multi-winding transformer T. Port circuits #2 to #m are all secondary port circuits, with their first sides connected to the corresponding secondary port windings (N2 to Nm) of the multi-winding transformer T. For this multi-winding transformer T, the coupling relationship between its main port winding N1 and each of the secondary port windings N2 to Nm is good, while the coupling relationship between each of the secondary port windings N2 to Nm is poor.

[0100] In practical applications, a corresponding impedance element 20 can also be provided between each winding and the first side of the corresponding port circuit 10. The impedance element 20 can be a capacitor or an inductor, or a series branch of a capacitor and an inductor, depending on the specific application environment, and all are within the protection scope of this application.

[0101] In addition, the second side of each port circuit 10 is used to connect a power source or a load; for example, the second side of the port circuit 10 may be connected to a DC power source such as a battery unit or a photovoltaic unit, or it may be connected to an AC power source such as a wind turbine, or it may be connected to a DC grid or an AC grid, or it may be connected to a DC or AC load; moreover, the second side of each port circuit 10 may be connected to different devices, which is not limited here, but depends on the specific application environment, and all are within the protection scope of this application.

[0102] In practical applications, in order to increase voltage or power, the port circuits 10 can also be connected in series or in parallel. For example, in order to adapt to a power supply or load with a higher voltage, at least two port circuits 10 can be connected in series on their second sides. In order to increase the power transmission between the power supply or load, at least two port circuits 10 can be connected in parallel on their second sides. It depends on the specific application environment, and all of them are within the protection scope of this application.

[0103] Each port circuit 10 can have various optional circuit structures. For example, port circuit 10 may include an AC / DC conversion circuit; the AC side of the AC / DC conversion circuit serves as the first side of port circuit 10, and the DC side of the AC / DC conversion circuit serves as the second side of port circuit 10. This AC / DC conversion circuit can employ various topologies found in the prior art. Figure 9 The H-bridge is used as an example for demonstration.

[0104] In practical applications, the port circuit 10 may also include a DC / AC conversion circuit or a DC / DC conversion circuit; for the DC / AC conversion circuit, its DC side is connected to the DC side of the AC / DC conversion circuit, and its AC side serves as the second side of the port circuit; for the DC / DC conversion circuit, it is specifically connected between the DC side of the AC / DC conversion circuit and the second side of the port circuit.

[0105] The multi-port power converter can adopt various topologies such as MAB (multi-active bridge) or MABSRC (Series resonance circuit) in the existing technology, and no limitation is made here.

[0106] Regardless of the circuit structure adopted by each port circuit 10, each port circuit 10 is controlled by the controller.

[0107] Under the control of the controller, power can be transmitted between any of the port circuits 10. The controller can achieve power control by adjusting the phase shift angle between the port circuits 10; for example, by adjusting the phase angle of port circuit #2 relative to the phase angle of port circuit #1, power transmission occurs between port circuits #1 and #2. If the multi-winding transformer T provided in the above embodiment is not used to achieve hardware decoupling, port circuits #3, #4 to #m will all have a phase difference with respect to port circuit #2, requiring the controller to use very complex control logic to achieve decoupling.

[0108] After hardware decoupling is achieved by using the multi-winding transformer T provided in the above embodiment, the controller can realize power transmission between the two by adjusting the first-side voltage phase difference between any primary port circuit and the main port circuit.

[0109] by Figure 9 Taking the three-port power converter shown as an example, each winding N1 to N3 of its three-winding transformer T is connected to the corresponding port circuit 10, and the port circuit 10 adopts an H-bridge (its second-side voltages are V... dc1 To V dc3 The impedance element 20 uses inductors (L1 to L3 as shown in the figure), which can then form a TAB (Three-phase dual-active bridge) converter. At this time, the controller can control the phase difference between the first-side voltages Uab, Ucd, and Uef of each port circuit 10 by controlling the switching of the power devices in each port circuit 10 to achieve power control.

[0110] If the three-winding transformer T fails to achieve power decoupling, assuming the output power of port circuit #3 is adjusted, when the phase difference between the first-side voltage Uef and Uab is moved, the first-side voltage Uef will also have a phase difference relative to Ucd. At this time, power will flow from port circuit #1 and port circuit #2 to port circuit #3, and the power between port circuit #1 and port circuit #2 will also be affected.

[0111] After adopting the multi-winding transformer T provided in the above embodiments, for example, using... Figure 2 The three-winding transformer shown achieves hardware decoupling. At this point, there is no coupling between port circuit #2 and port circuit #3, and no direct power transfer. The controller can use the first-side voltage Uab of port circuit #1 as a reference and move the phase difference of port transformer Uef relative to Uab. The power transfer formula is:

[0112]

[0113] in, Let Uab be the phase difference between port transformers Uab and Uef, L be the inductance between port circuit #1 and port circuit #3, n be the turns ratio between windings N1 and N3, and V1 be the voltage V on the second side of port circuit #1. dc1 V2 is the second-side voltage V of port circuit #3. dc3 f s Let U be the switching frequency of each power device in port circuit 10. The phase of the first-side voltage Ucd remains unchanged, so the power between port circuit #1 and port circuit #2 remains constant. The phase difference between the first-side voltage Ucd and Uef changes, but there is no coupling; therefore, the power between port circuit #1 and port circuit #3 remains unchanged. Similarly, to achieve power transfer between port circuit #1 and port circuit #2, it is only necessary to adjust the phase difference of the first-side voltage Ucd relative to Uab.

[0114] In addition, the controller can also be used to adjust the phase difference of the first-side voltage between the two secondary port circuits and the main port circuit, thereby realizing power transmission between the two secondary port circuits.

[0115] Specifically, the controller can adjust the first-side voltage phase of one of the secondary port circuits to lead the first-side voltage phase of the main port circuit, and adjust the first-side voltage phase of the other secondary port circuit to lag behind the first-side voltage phase of the main port circuit, so that the power transmitted by the two secondary port circuits to the main port circuit is the same in magnitude and opposite in direction.

[0116] Still with Figure 9 Taking the structure shown as an example, when controlling the power between port circuit #2 and port circuit #3, for example, by increasing the power P0 flowing from port circuit #2 to port circuit #3, the first-side voltage Ucd of port circuit #2 can lead the first-side voltage Uab of port circuit #1, while the first-side voltage Uef of port circuit #3 lags behind the first-side voltage Uab of port circuit #1. This makes the power P13 transmitted from port circuit #1 to port circuit #3 equal to the power P21 transmitted from port circuit #2 to port circuit #1. In other words, the power P0 can be controlled to flow from port circuit #2 to port circuit #3, thus achieving power decoupling of the three-winding transformer.

[0117] The cases where the number of windings m takes other values ​​can be deduced similarly, and will not be elaborated on one by one.

[0118] Regardless of the value of the number of windings m, when any secondary port circuit is loaded or unloaded, it is only necessary to control the power flowing from the main port circuit to that secondary port circuit, or to individually control other secondary port circuits to direct their power to the main port circuit, and then from the main port circuit to the secondary port circuit where the load is being loaded or unloaded. It can be seen that by using a multi-winding transformer with hardware decoupling, the controller's control logic becomes simpler and easier to implement, reducing the controller's control complexity.

[0119] Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0120] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0121] The features described above regarding the disclosed embodiments can be substituted for or combined with each other to enable those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-winding transformer, characterized in that, include: The magnetic core structure and multiple windings; among them, The magnetic core structure includes multiple magnetic pillars; each magnetic pillar is connected by an upper yoke core and a lower yoke core, or each magnetic pillar independently forms a magnetic flux loop; The plurality of windings includes: a primary port winding, and at least two secondary port windings; Each of the magnetic pillars is wound with: a portion of the main port winding, and at least a portion of the secondary port winding; The magnetic flux generated by any of the secondary port windings to the other secondary port windings is less than a preset threshold.

2. The multi-winding transformer according to claim 1, characterized in that, The magnetic flux generated by any of the secondary port windings to the other secondary port windings is zero.

3. The multi-winding transformer according to claim 1, characterized in that, The main port winding includes: at least two sub-windings connected in parallel; and at least a portion of the coil of one of the sub-windings is wound on each of the magnetic posts.

4. The multi-winding transformer according to any one of claims 1 to 3, characterized in that, If all the magnetic pillars are connected, then: Each of the magnetic pillars is wound with at least a portion of the coil of one of the sub-windings, and at least a portion of the coil of one of the secondary port windings; The number of magnetic pillars is even, and each magnetic pillar has another magnetic pillar that is symmetrical about the central axis; or the number of magnetic pillars is odd, wherein there is at least one pair of magnetic pillars that are symmetrical about the central plane, and a magnetic pillar that is itself symmetrical about the central plane.

5. The multi-winding transformer according to claim 4, characterized in that, The number of turns of the coil wound on the magnetic post symmetrical about the central axis or the central plane is the same for the same winding, and the ratio of the number of turns of the coils of different windings wound on each magnetic post is equal to the ratio of the number of turns of the corresponding two windings.

6. The multi-winding transformer according to claim 5, characterized in that, There are at least two magnetic pillars, on which the number of turns of each winding is half the number of turns of the corresponding winding.

7. The multi-winding transformer according to claim 4, characterized in that, There is at least one of the secondary port windings, with half of its turns and the other half of its turns wound on the magnetic pillars on both sides of the central axis or the central plane, and the winding directions of the coils on the two symmetrical magnetic pillars are symmetrical. The main port winding includes at least two parallel sub-windings, and there is at least one sub-winding in which half of the turns of the coil and the other half of the turns of the coil are wound on the magnetic pillars on both sides of the central axis or the central plane, and the winding directions of the coils on the two symmetrical magnetic pillars are symmetrical.

8. The multi-winding transformer according to claim 4, characterized in that, All the coils of the secondary port winding are wound on the magnetic column that is symmetrical about the central plane. The main port winding includes at least two parallel-connected sub-windings, and all the coils of one of the sub-windings are wound on the magnetic post symmetrical about the central plane.

9. The multi-winding transformer according to claim 7, characterized in that, There is also at least one pair of magnetic pillars symmetrical about the central axis or the central plane, on which all the coils of the secondary port winding and all the coils of the sub-winding are wound together.

10. The multi-winding transformer according to any one of claims 1 to 3, characterized in that, Each of the magnetic pillars independently forms a magnetic flux loop, and the number of magnetic pillars is even. The main port winding includes at least two sub-windings connected in parallel. Each sub-winding is wound with a corresponding secondary port winding in the same winding direction on at least one pair of magnetic pillars. Furthermore, the winding directions of different secondary port windings on at least one magnetic pillar are the same, while the winding directions on the same number of other magnetic pillars are opposite.

11. A multi-port power converter, characterized in that, include: A controller, multiple port circuits, and a multi-winding transformer as described in any one of claims 1 to 10; wherein, Each winding of the multi-winding transformer is connected to a first side corresponding to the port circuit; The second side of each of the aforementioned port circuits is used to connect a power source or a load; Each of the port circuits is controlled by the controller.

12. The multi-port power converter according to claim 11, characterized in that, Each of the aforementioned port circuits comprises: one main port circuit, and at least two secondary port circuits; The first side of the main port circuit is connected to the main port winding in the multi-winding transformer. The first side of the secondary port circuit is connected to the secondary port winding of the multi-winding transformer.

13. The multi-port power converter according to claim 12, characterized in that, The controller is used to adjust the first-side voltage phase difference between any of the secondary port circuits and the main port circuit to achieve power transmission between them.

14. The multi-port power converter according to claim 12, characterized in that, The controller is used to adjust the first-side voltage phase difference between the two secondary port circuits and the main port circuit, respectively, to realize power transmission between the two secondary port circuits.

15. The multi-port power converter according to claim 14, characterized in that, When the controller is used to control the power transmission between the two secondary port circuits, it is specifically used to: adjust the first-side voltage phase of one of the secondary port circuits to lead the first-side voltage phase of the main port circuit, and adjust the first-side voltage phase of the other secondary port circuit to lag the first-side voltage phase of the main port circuit, so that the power transmitted by the two secondary port circuits to the main port circuit is the same in magnitude and opposite in direction.

16. The multi-port power converter according to any one of claims 11 to 15, characterized in that, The port circuit includes an AC / DC conversion circuit; the AC side of the AC / DC conversion circuit serves as the first side of the port circuit, and the DC side of the AC / DC conversion circuit serves as the second side of the port circuit.

17. The multi-port power converter according to claim 16, characterized in that, The port circuit also includes: a DC / AC conversion circuit or a DC / DC conversion circuit; The DC side of the DC / AC conversion circuit is connected to the DC side of the AC / DC conversion circuit, and the AC side of the DC / AC conversion circuit serves as the second side of the port circuit. The DC / DC converter circuit is connected between the DC side of the AC / DC converter circuit and the second side of the port circuit.

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