CN214588391U - Structure of transformer - Google Patents

Abstract

The utility model relates to a structure of a transformer, which comprises a magnetic core structure and a winding structure, wherein the winding structure comprises an annular tubular primary winding and a secondary winding arranged inside the primary winding; the magnetic core structure comprises a plurality of annular magnetic cores which are distributed annularly, the primary winding penetrates through the plurality of annular magnetic cores at least once, the primary winding is a hollow tubular conductor, and the secondary winding is at least one conducting wire conductor. The utility model discloses can compromise better and coordinate excitation inductance big, alternating current resistance is little, the small isoparametric requirement of leakage inductance and distributed capacitance, especially satisfy the demand under the high-pressure condition, compact structure is simple simultaneously, and is small, with low costs.

Description

Structure of transformer

The technical field is as follows:

the utility model relates to a structure of transformer.

Background art:

the transformer is a key device of an electrical device, and basic requirements are that the excitation inductance is large and the alternating current resistance is small. Under the condition of high-frequency operation, the distribution parameters, such as leakage inductance and distribution capacitance, have important influence on the performance of the high-frequency transformer, and the parameters are mutually restricted and influenced. The magnetic core structure and the winding structure of the transformer can obviously influence the size of distribution parameters, and the traditional transformer structure is difficult to meet the requirements of parameters such as excitation inductance, alternating current resistance, leakage inductance and distribution capacitance.

The utility model has the following contents:

the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a structure of transformer is provided, reasonable in design can compromise better and coordinate the distribution parameter requirement.

In order to realize the purpose, the utility model discloses a technical scheme is: a structure of a transformer comprises a magnetic core structure and a winding structure, wherein the winding structure comprises a primary winding in an annular tube shape and a secondary winding arranged in the primary winding; the magnetic core structure comprises a plurality of annular magnetic cores, and the primary winding penetrates through the annular magnetic cores at least once.

Further, the primary winding is a hollow tubular conductor, and the secondary winding is at least one wire conductor.

Further, when the secondary winding is more than one wire conductor, the wire conductors are circumferentially and uniformly distributed around the axis of the tubular conductor and are close to the inner wall of the tubular conductor.

Furthermore, the secondary winding uses a lead conductor to pass through the inside of the tubular conductor for multiple times to form multiple turns, or more than one lead conductor is connected in series at the leading-out position of the port of the tubular conductor.

Further, the primary winding is located at the center or at a symmetrical position of the annular magnetic core.

Further, the annular magnetic core is annular.

Compared with the prior art, the utility model discloses following effect has: the utility model discloses can compromise better and coordinate excitation inductance big, alternating current resistance is little, the small isoparametric requirement of leakage inductance and distributed capacitance, especially satisfy the demand under the high-pressure condition, compact structure is simple simultaneously, and is small, with low costs.

Description of the drawings:

FIG. 1 is a schematic perspective view of the magnetic core in an annular arrangement according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a winding structure in an embodiment of the invention;

fig. 3 is a schematic diagram of a port connection of a winding structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of the three-dimensional structure of the magnetic core in a racetrack arrangement according to the embodiment of the present invention;

fig. 5 shows the magnetic field distribution of the current applied by the tubular conductor when the winding and the magnetic core are concentric according to the embodiment of the present invention.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1 to 5, the structure of the transformer of the present invention includes a magnetic core structure 1 and a winding structure 2, wherein the winding structure 2 includes an annular tubular primary winding 3 and a secondary winding 4 disposed inside the primary winding 3; the magnetic core structure 1 comprises a plurality of annular magnetic cores 5, and the primary winding 3 penetrates through the plurality of annular magnetic cores 5 at least once.

In this embodiment, the primary winding 3 is a hollow tubular conductor 6, and the secondary winding 4 is at least one wire conductor 7. Preferably, when the secondary winding is a wire conductor 7, the wire conductor 7 is located at the center of the tubular conductor 6; when the secondary winding is larger than one wire conductor 7, the wire conductors 7 are circumferentially distributed around the axis of the tubular conductor 6 and close to the inner wall of the tubular conductor 6, as shown in fig. 2. Note that the tubular conductor may have a circular ring shape, a rectangular ring shape, a racetrack shape, or the like.

In this embodiment, the number of the inner wire conductors 7 is the turns ratio of the transformer. The secondary winding is formed by passing one lead conductor 7 through the inside of the tubular conductor 6 multiple times to form multiple turns, or more than one lead conductor 7 is connected in series at the outlet of the port of the tubular conductor 6, as shown in fig. 3.

In this embodiment, the thicknesses of the insulating layers of the lead conductors 7 in the turns of the transformer may be different, and the smallest thickness of the insulating layer in each turn is selected according to the withstand voltage condition, so as to reduce the leakage inductance of the secondary side as much as possible. If it is desired to reduce the distributed capacitance between the primary tubular conductor 6 and the inner secondary turns of the wire conductor 7, the distance between the tubular conductor 6 and the wire conductor 7 can be increased to reduce the distributed capacitance.

In this embodiment, the plurality of annular magnetic cores are spatially distributed in an annular shape. Preferably, as shown in fig. 1, a plurality of annular magnetic cores 5 with appropriate sizes are distributed in a circular ring shape in space, so as to meet the requirement of excitation inductance, and the adoption of the annular magnetic cores can reduce the magnetic resistance of a magnetic circuit and reduce the eddy current loss of the magnetic core. It should be noted that, several annular magnetic cores 5 may also be arranged in a rectangular ring shape, a racetrack shape or other manners, and the total cross-sectional area of the annular magnetic cores 5 is determined according to the magnitude of the excitation inductance. As shown in fig. 4, the toroidal cores 5 are arranged in a racetrack configuration.

In this embodiment, the tubular conductor 6 passes through the annular magnetic core 5 in an annular arrangement at least once, e.g. n times, corresponding to n turns of the primary winding.

In this embodiment, if the tubular conductor 6 penetrates through the plurality of annular magnetic cores 5 at a time, the tubular conductor 6 is located at the center of the annular magnetic cores 5; if the tubular conductor 6 penetrates through the annular magnetic cores 5 for multiple times, the multiple turns of the tubular conductor 6 are located at symmetrical positions of the annular magnetic cores 5, so that the generated magnetic fields are distributed symmetrically. Fig. 5 shows the distribution of the magnetic field applied by the tubular conductor when the winding and the core are concentric, and the magnetic field generated by the current on the tubular conductor 6 will be entirely linked to the wire conductor 7.

In this embodiment, the annular magnetic core 5 is annular, and the annular magnetic core has the shortest magnetic path length, the smallest magnetic resistance and the largest excitation inductance.

It should be noted that if the transformer winding needs a center tap, the terminals can be placed at appropriate positions.

In this embodiment, as shown in fig. 5, the magnetic field generated by the current on the tubular conductor is uniformly distributed and all links through the wire conductor.

The utility model has the advantages that:

(1) the magnetic core adopts a circular structure, the magnetic circuit length of the magnetic core is shortest, the magnetic resistance is minimum, and the excitation inductance is maximum;

(2) each turn of the lead conductor is wrapped inside the tubular conductor and matched with the annular magnetic core, so that the transformer has a good symmetrical structure, all magnetic fields generated by current on the tubular conductor can be linked by each turn of the lead conductor inside, and the leakage inductance on the side of the tubular conductor can be eliminated; when the tubular conductor is used as a step-up transformer, the tubular conductor forms the primary side, so that the primary side winding has no leakage inductance, and when the tubular conductor is used as a step-down transformer, the secondary side has no leakage inductance.

(3) For the traditional foil conductor, the current is not uniformly distributed on the foil conductor, and the lead is difficult to lead out; the winding in the utility model is of a tubular structure, so that the winding current is uniformly distributed on the conductor, and the lead is convenient to be led out;

(4) one winding (such as a primary winding) of the transformer adopts a tubular conductor, and the other winding (such as a secondary winding) is wrapped by the tubular conductor, so that the tubular conductor can play a good role in shielding an electric field.

The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.

The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims (6)

1. A structure of a transformer, characterized in that: the winding structure comprises an annular tubular primary winding and a secondary winding arranged inside the primary winding; the magnetic core structure comprises a plurality of annular magnetic cores, and the primary winding penetrates through the annular magnetic cores at least once.

2. A transformer structure according to claim 1, characterized in that: the primary winding is a hollow tubular conductor, and the secondary winding is at least one wire conductor.

3. A transformer structure according to claim 2, characterized in that: when the secondary winding is more than one wire conductor, the wire conductors are uniformly distributed around the axis of the tubular conductor in a circumference manner and are close to the inner wall of the tubular conductor.

4. A transformer structure according to claim 2, characterized in that: the secondary winding uses a lead conductor to penetrate through the inside of the tubular conductor for multiple times to form multiple turns, or more than one lead conductor is connected in series at the leading-out position of the port of the tubular conductor.

5. A transformer structure according to claim 1, characterized in that: the primary winding is positioned at the center or at a symmetrical position of the annular magnetic core.

6. A transformer structure according to claim 1, characterized in that: the annular magnetic core is annular.

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