CN114783739A - Integrated multi-port high-frequency transformer - Google Patents

Abstract

The invention discloses an integrated multiport high-frequency transformer, which comprises: all the first secondary coils are wound on different sides of the polygonal iron core respectively, a primary coil is wound outside each first secondary coil, and all the second secondary coils are wound on different sides of the polygonal iron core respectively; two output ends of each primary coil form a port; two output ends of all the first secondary coils form at least one port; the two outputs of all the second secondary windings constitute at least one port. According to the embodiment of the invention, the port configuration can be flexibly adjusted according to external requirements, the high-frequency transformer and the external reactor device are integrally designed, the floor area is reduced, the manufacturing cost is reduced, the power density of the whole device is improved, and the compact design of the device is realized.

Description

Integrated multiport high-frequency transformer

Technical Field

The invention relates to the technical field of high-frequency transformers, in particular to an integrated multi-port high-frequency transformer.

Background

With the wide access of direct current power supplies and direct current loads such as distributed power supplies, novel energy storage devices, fuel cells, hydrogen energy and data centers, the power distribution network is required to have the power supply capacity of alternating current power supply access, direct current power supply access and alternating current/direct current loads. The multi-port and multi-voltage class converter has wide application prospect in an alternating current-direct current hybrid system, can ensure the power supply quality of a power system, and fully meets the requirements of power users on power supply reliability, safety, flexibility and economy. The integrated high-frequency transformer provides important support for realizing multi-port alternating current and direct current power supply and electrical isolation.

In the existing multi-port converter, different ports are constructed by adopting single-phase double-winding high-frequency transformers, the number of the required high-frequency transformers is increased, so that the device is large in size, large in occupied area, complex in external wiring and complex in operation and maintenance of a junction box; in order to meet the requirement of the external converter on the port inductor, an external connection inductor is required to be configured, and the size and the complexity of the device are further increased.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the number of required high-frequency transformers is increased because different ports are constructed by adopting single-phase double-winding high-frequency transformers in the conventional multi-port converter, so that the integrated multi-port high-frequency transformer is provided.

In order to achieve the purpose, the invention provides the following technical scheme:

the embodiment of the invention provides an integrated multiport high-frequency transformer, which comprises: the transformer comprises a polygonal iron core, a plurality of primary coils, a plurality of first secondary coils and a plurality of second secondary coils, wherein all the first secondary coils are wound on different sides of the polygonal iron core respectively, one primary coil is wound outside each first secondary coil, and all the second secondary coils are independently and respectively wound on different sides of the polygonal iron core; two output ends of each primary coil form a port; two output ends of all the first secondary coils form at least one port; the two outputs of all the second secondary windings constitute at least one port.

In one embodiment, the primary coil and the first secondary coil are both cylindrical structures and are wound concentrically.

In one embodiment, each first secondary coil is uniformly spaced from the iron core; each first secondary coil is uniformly spaced from the externally wound primary coil.

In one embodiment, the primary coil, the first secondary coil and the polygonal iron core are symmetrically arranged relative to the second secondary coil.

In an embodiment, the second secondary coil is arranged away from the high potential.

In one embodiment, the primary coil and the first secondary coil both adopt Poisson windings.

In one embodiment, the second secondary coil is made of litz wire material.

In one embodiment, two ends of all the first secondary coils are connected in parallel or in series to form a medium-voltage port; the medium voltage ports are connected in parallel to a medium voltage common bus through an external circuit.

In one embodiment, two ends of all the second secondary coils are connected in parallel or in series to form a low-voltage port; or, two ends of each second secondary coil separately form a low-voltage port; the low voltage ports are connected in parallel to a low voltage common bus through an external circuit.

In one embodiment, both ends of each primary coil form a high voltage port; the high voltage port is connected to the high voltage bus bar in a cascade fashion by an external circuit.

The technical scheme of the invention has the following advantages:

1. according to the integrated multi-port high-frequency transformer provided by the invention, all the first secondary coils are wound on different edges of the polygonal iron core respectively, one primary coil is wound outside each first secondary coil, and all the second secondary coils are wound on different edges of the polygonal iron core respectively; two output ends of each primary coil form a port; two output ends of all the first secondary coils form at least one port; the two outputs of all the second secondary windings constitute at least one port. The port configuration of the embodiment of the invention can be flexibly adjusted according to external requirements, the high-frequency transformer and the external reactor device are integrally designed, the floor area is reduced, the manufacturing cost is reduced, the power density of the whole device is improved, and the compact design of the device is realized.

2. According to the integrated multi-port high-frequency transformer provided by the invention, the primary coil and the first secondary coil are both of cylindrical structures and are wound concentrically, and through the concentric/non-concentric winding structure and layout, the differentiated strong coupling or weak coupling among the windings is realized, so that the requirements of different ports on the impedance of the high-frequency transformer are met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1(a) and fig. 1(b) are schematic diagrams respectively illustrating a specific example of an integrated multiport high-frequency transformer according to an embodiment of the present invention;

fig. 2(a) to fig. 3(d) are schematic electrical connection diagrams of the integrated multiport high-frequency transformer according to the embodiment of the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

An embodiment of the present invention provides an integrated multi-port high-frequency transformer, as shown in fig. 1(a) and 1(b), including: the polygonal core, the plurality of primary coils, the plurality of first secondary coils, and the plurality of second secondary coils, and the configurations shown in fig. 1(a) and 1(b) are a triangular core five-coil high-frequency transformer and a rectangular core six-coil high-frequency transformer, respectively, where the polygonal core #11 in fig. 1(a) is triangular and the polygonal core #12 in fig. 1(b) is rectangular, which is only for example and not intended to be limiting.

As shown in fig. 1(a) and 1(b), all the first secondary coils are respectively wound on different sides of the polygonal iron core, one primary coil is wound outside each first secondary coil, and all the second secondary coils are respectively and independently wound on different sides of the polygonal iron core.

Specifically, in fig. 1(a), a first secondary coil #31 and a first secondary coil #32 are wound on different sides of a polygonal iron core #11, respectively, the first secondary coil #31 is wound on a primary coil #21 and the first secondary coil #32 is wound on a primary coil #22, and a second secondary coil #41 is wound on one side of the polygonal iron core #11, respectively, i.e., the primary coil does not need to be wound outside the second secondary coil # 41; similarly, in fig. 1(b), the first secondary winding #33 and the first secondary winding #34 are wound on different sides of the polygonal core #12, the first secondary winding #33 and the first secondary winding #34 are wound on the outer sides thereof respectively around the primary winding #23 and the primary winding #24, and the second secondary winding #42 and the second secondary winding #43 are wound on different sides of the polygonal core #12 respectively, i.e., the second secondary winding #42 and the second secondary winding #43 are wound on the outer sides thereof without winding the primary winding.

According to the invention, the second secondary coil is independently wound on the polygonal iron core, so that the coupling degree of the second secondary coil and the first secondary coil/primary coil can be reduced, the port inductance of the second secondary coil is increased, the maximum value of current pulse in an external topological structure is reduced, and meanwhile, the increase of the inductance can completely omit an inductance device required by a low-voltage adjustable port and reduce the occupied area of the whole device. Furthermore, the second secondary winding is arranged away from the high potential, thereby reducing the insulation requirements.

Furthermore, two output ends of each primary coil form a port; two output ends of all the first secondary coils form at least one port; the two outputs of all the second secondary windings constitute at least one port.

Specifically, two ends of each primary coil of the embodiment of the invention form a high-voltage port; the high voltage port is connected to the high voltage bus bar in a cascade fashion by an external circuit. Two ends of all the first secondary coils are connected in parallel or in series to form a medium-voltage port; the medium voltage ports are connected in parallel to a medium voltage common bus through an external circuit. Two ends of all the second secondary coils are connected in parallel or in series to form a low-voltage port; or, two ends of each second secondary coil independently form a low-voltage port; the low voltage ports are connected in parallel to a low voltage common bus through an external circuit. The embodiment of the invention can flexibly access various energy sources and various loads by arranging the multi-port winding, and meets the requirements on ports and voltage in different scenes.

For example, with respect to the structure shown in fig. 1(a), the multi-port high-frequency transformer according to the embodiment of the present invention may be a four-port high-frequency transformer, the electrical wiring diagram of the four-port high-frequency transformer is shown in fig. 2(a) and fig. 2(b), in fig. 2(a), two ends of a primary coil #21 and a primary coil #22 respectively form a high-voltage port, two ends of a first secondary coil #31 and a first secondary coil #32 are connected in parallel to form a medium-voltage port, and two ends of a second secondary coil #41 separately form a low-voltage port; in fig. 2(b), two ends of the primary coil #21 and the primary coil #22 form a high-voltage port, two ends of the first secondary coil #31 and the first secondary coil #32 are connected in series to form a medium-voltage port, and two ends of the second secondary coil #41 form a low-voltage port.

For example, with respect to the structure shown in fig. 1(b), the electrical wiring diagrams of the multi-port high-frequency transformer according to the embodiment of the present invention are shown in fig. 3(a) to 3(d), in fig. 3(a), two ends of the primary coil #23 and the primary coil #24 respectively form a high-voltage port, two ends of the first secondary coil #33 and the first secondary coil #34 are connected in parallel to form a medium-voltage port, and two ends of the second secondary coil #42 and the second secondary coil #43 are connected in parallel to form a low-voltage port; in fig. 3(b), two ends of the primary coil #23 and the primary coil #24 respectively form a high-voltage port, two ends of the first secondary coil #33 and the first secondary coil #34 are connected in parallel to form a medium-voltage port, and two ends of the second secondary coil #42 and the second secondary coil #43 respectively form a low-voltage port; in fig. 3(c), two ends of the primary coil #23 and the primary coil #24 respectively form a high-voltage port, two ends of the first secondary coil #33 and the first secondary coil #34 are connected in series to form a medium-voltage port, and two ends of the second secondary coil #42 and the second secondary coil #43 respectively form a low-voltage port; in fig. 3(d), both ends of the primary coil #23 and the primary coil #24 form a high-voltage port, both ends of the first secondary coil #33 and the first secondary coil #34 are connected in series to form a medium-voltage port, and both ends of the second secondary coil #42 and the second secondary coil #43 are connected in parallel to form a low-voltage port.

In a specific embodiment, the first secondary coil and the second secondary coil are both wound with the polygonal iron core in a close-fitting manner, all the primary coils adopt the same structural parameters (including the number of turns, the shape and the like), all the first secondary coils adopt the same structural parameters (including the number of turns, the shape and the like), and in addition, the primary coils and the first secondary coils are both in a cylindrical structure and are wound concentrically, so that the magnetic leakage is further reduced, and the coupling degree of the coils is increased.

Specifically, the primary coil and the first secondary coil are concentrically wound, and the second secondary coil, the primary coil and the first secondary coil are not concentrically wound, so that different impedance difference design requirements among windings are met by adopting a mode of combining a concentric structure with a non-concentric structure.

In a specific embodiment, the interval between each first secondary coil and the iron core is kept consistent; each first secondary winding is uniformly spaced from the externally wound primary winding. According to the embodiment of the invention, leakage inductance differentiation design among different ports is realized through integrated multi-port winding arrangement, the ports can be connected in series, in parallel or independently through an external interface circuit, and the number of the ports can be flexibly configured.

Exemplarily, taking fig. 1(b) as an example, the interval between the first secondary coil #33 and the primary coil #23, and the interval between the first secondary coil #34 and the primary coil #24 are kept coincident; the interval between the first secondary winding #33 and the core, and the interval between the first secondary winding #34 and the core are kept uniform.

Specifically, the interval between the second secondary coil and the iron core is not limited, and is specifically set according to a connection manner of two ends of the second secondary coil. For example: as shown in fig. 3(a) and 3(d), when the second secondary coil #42 and the second secondary coil #43 are connected in parallel at both ends thereof to form one low voltage port, the interval between the second secondary coil #42 and the polygonal core #12 and the interval between the second secondary coil #43 and the polygonal core #12 are maintained to be identical, and as shown in fig. 3(b) and 3(c), when both ends of the second secondary coil #42 and the second secondary coil #43 are separately formed to be one low voltage port, the interval between the second secondary coil #42 and the polygonal core #12 and the interval between the second secondary coil #43 and the polygonal core #12 are not necessarily maintained to be identical. In one embodiment, the primary coil, the first secondary coil and the polygonal iron core are symmetrically arranged relative to the second secondary coil, and the high symmetry structure enables impedance symmetry degrees between the primary coil and the first secondary coil and between the second secondary coil and other coils to be consistent, and reduces impedance difference.

Exemplarily, taking fig. 1(a) as an example, the first secondary coil #31 and the primary coil #21 are symmetrically arranged with respect to the second secondary coil #41 with respect to the first secondary coil #32 and the primary coil #22, respectively, and three sides of the polygonal core #11 are symmetrically arranged with respect to the second secondary coil # 41; taking fig. 1(b) as an example, the first secondary coil #33 and the first secondary coil #23 are respectively arranged symmetrically with respect to the first secondary coil #34 and the first secondary coil #24 with respect to the second secondary coil #42 and the second secondary coil #43, and the four sides of the polygonal core #12 are arranged symmetrically with respect to the second secondary coil #42 and the second secondary coil # 43.

In one embodiment, the primary coil and the first secondary coil both adopt Poisson windings, so that the compactness of the high-frequency transformer is increased, the volume of the device is reduced, and the power density is increased. The second secondary coil is made of a litz wire material, so that the loss of the device can be reduced and the efficiency can be improved through high-frequency large current.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (10)

1. An integrated multiport high frequency transformer, comprising: a polygonal iron core, a plurality of primary coils, a plurality of first secondary coils, a plurality of second secondary coils, wherein,

all the first secondary coils are wound on different sides of the polygonal iron core respectively, a primary coil is wound outside each first secondary coil, and all the second secondary coils are wound on different sides of the polygonal iron core respectively;

two output ends of each primary coil form a port;

two output ends of all the first secondary coils form at least one port;

the two outputs of all the second secondary windings constitute at least one port.

2. The integrated multiport high-frequency transformer according to claim 1, characterized in that the primary coil and the first secondary coil are both of cylindrical structure and are wound concentrically.

3. The integrated multiport high frequency transformer according to claim 2,

the interval between each first secondary coil and the iron core is kept consistent;

the interval between each first secondary coil and the externally wound primary coil is kept consistent.

4. The integrated multiport high-frequency transformer according to claim 3,

the primary coil, the first secondary coil and the polygonal iron core are symmetrically arranged relative to the second secondary coil.

5. The integrated multiport high-frequency transformer according to claim 4,

the second secondary coil is arranged away from the high potential.

6. The integrated multiport high-frequency transformer according to claim 4,

the primary coil and the first secondary coil both adopt Poisson windings.

7. The integrated multiport high-frequency transformer according to claim 4,

the second secondary coil is made of litz wire materials.

8. The integrated multiport high frequency transformer according to any of claims 1 to 7,

two ends of all the first secondary coils are connected in parallel or in series to form a medium-voltage port;

the medium voltage port is connected in parallel to a medium voltage common bus through an external circuit.

9. The integrated multiport high-frequency transformer according to any of claims 1 to 7,

two ends of all the second secondary coils are connected in parallel or in series to form a low-voltage port;

or, two ends of each second secondary coil separately form a low-voltage port;

the low voltage port is connected in parallel to a low voltage common bus by an external circuit.

10. The integrated multiport high-frequency transformer according to any of claims 1 to 7,

two ends of each primary coil form a high-voltage port;

the high voltage port is connected to a high voltage bus in a cascade fashion by an external circuit.

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