CN216957676U - Pulse transformer and electronic equipment - Google Patents

Abstract

The application discloses a pulse transformer and electronic equipment. The pulse transformer comprises a drum-shaped magnetic core, a plate-shaped magnetic core and a winding, wherein the drum-shaped magnetic core comprises a winding core part and two side core parts, the winding is wound on the winding core part, the two side core parts are respectively arranged at two ends of the winding core part, which are oppositely arranged along a first direction, and the side core parts protrude out of the winding core part after winding along a third direction; the third direction is vertical to the first direction; in the third direction, the plate-type magnetic core is disposed at one end of the two side core portions protruding from the winding core portion, and a magnetic path sectional area of the plate-type magnetic core is smaller than or equal to that of the winding core portion. The magnetic circuit is beneficial to increasing the sectional area of the magnetic circuit, so that the resistance of the magnetic circuit is reduced, and high inductance and small-size design are considered.

Description

Pulse transformer and electronic equipment

Technical Field

The application relates to the technical field of transformers, in particular to a pulse transformer and electronic equipment.

Background

The pulse transformer not only plays an insulation role at the network port, but also is used for filtering common-mode noise in the differential signal. At present, the transmission rate of the network port is mainly giga, and when the transmission rate is increased to 2.5Gbps and 5Gbps, the corresponding pass band is required to be increased continuously. In order to meet the demand for higher transmission rates, surface mount type pulse transformers suitable for high density mounting have been used in large numbers in recent years, and high inductance has been sought in pulse transformers. Since the inductance of the pulse transformer is inversely proportional to the reluctance of the magnetic circuit, the smaller the reluctance, the higher the inductance, and the simplest method for reducing the reluctance of the magnetic circuit is to increase the size of the magnet, thereby increasing the cross-sectional area of the magnetic circuit. However, the large-size pulse transformer is difficult to meet the miniaturization requirement.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a pulse transformer and electronic equipment, which are used for solving the problem that the pulse transformer is difficult to give consideration to high inductance and small-size design.

In a first aspect, an embodiment of the present application provides a pulse transformer, including a drum-shaped magnetic core, a plate-shaped magnetic core, and a winding, where the drum-shaped magnetic core includes a winding core portion and two side core portions, the winding is wound on the winding core portion, the two side core portions are respectively disposed at two ends of the winding core portion, which are oppositely disposed along a first direction, and the side core portions protrude from the winding core portion after winding along a third direction; the third direction is vertical to the first direction; in the third direction, the plate-type magnetic core is disposed at one end of the two side core portions protruding from the winding core portion, and a magnetic path sectional area of the plate-type magnetic core is smaller than or equal to that of the winding core portion.

Optionally, the magnetic path cross-sectional area of the winding core is S₁The magnetic circuit of the plate-shaped magnetic core has a sectional area S₂，S₂＝k₁*S₁And k is₁≥0.5。

Optionally, the distance between the two side cores is D₁The length of the roll core part along the second direction is D₂The first direction, the second direction and the third direction are pairwise perpendicular, D₂＝k₂*D₁And 1 < k₂≤1.5。

Optionally, the distance between the slab core and the side core is D₃And 0 < D₃≤10μm。

Alternatively, the plate-shaped magnetic core and the side core are bonded by glue.

Optionally, the center of the roll core is located on a central axis of the roll core in the first direction.

Optionally, in the third direction, a distance between a center of the roll core and a first end of the side core is greater than a distance between the center and a second end of the side core, the first end and the second end being disposed opposite to each other in the third direction.

Optionally, the winding core is any one of a rectangular body, a cylindrical body, and a prism body.

Optionally, an electrode is disposed at an end of at least one of the two side cores facing away from the plate-shaped magnetic core, and the winding is connected to the electrode.

In a second aspect, an embodiment of the present application provides an electronic device, including any one of the pulse transformers described above.

As described above, the pulse transformer according to the embodiment of the present application includes the drum-shaped magnetic core and the plate-shaped magnetic core, the magnetic path sectional area of the plate-shaped magnetic core is smaller than or equal to the magnetic path sectional area of the winding core portion, and the magnetic path sectional area of the pulse transformer is advantageously increased, so that the resistance of the magnetic path is reduced, and the high inductance and the small size design are both considered.

Drawings

Fig. 1 is a schematic perspective view of a pulse transformer according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the assembly of the drum-type core and the plate-type core shown in FIG. 1;

FIG. 3 is a schematic view of the drum core of FIG. 1;

fig. 4 is a schematic perspective view of the plate-shaped magnetic core shown in fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below in detail with reference to specific embodiments and accompanying drawings. It should be apparent that the embodiments described below are only some embodiments of the present application, and not all embodiments. In the following embodiments and technical features thereof, all of which are described below may be combined with each other without conflict, and also belong to the technical solutions of the present application.

It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

Referring to fig. 1 to 4 together, a pulse transformer 10 according to an embodiment of the present invention includes a drum core 11, a plate core 12, and a winding 13.

The drum-type magnetic core 11 includes a winding core portion 111 and two side core portions 112, the winding 13 is wound around the winding core portion 111, the two side core portions 112 are respectively disposed at opposite ends of the winding core portion 111 in the first direction x, and the side core portions 112 protrude from the winding core portion 111 after winding in the third direction z. In the orientation shown in fig. 1, the third direction z may be regarded as the height direction of the pulse transformer 10, the first direction x may be regarded as the length direction of the pulse transformer 10, the width direction of the pulse transformer 10 may be regarded as the second direction y, and the first direction x, the second direction y, and the third direction z are perpendicular to each other in pairs.

The plate-shaped magnetic core 12 is a plate-shaped magnetic member, and the plate-shaped magnetic core 12 is disposed at one end of the two side core portions 112 protruding from the winding core portion 111 in the third direction z, and the plate-shaped magnetic core 12 and the drum-shaped magnetic core 11 are connected to form a closed magnetic path. The plate-shaped core 12 has a magnetic path sectional area smaller than or equal to that of the winding core 111.

The magnetic circuit sectional area of the pulse transformer 10 can be regarded as the area of the section of the pulse transformer 10 in the second direction y and the third direction z, the magnetic circuit sectional area of the winding core 111 is larger, the area of the section of the winding 13 in the second direction y and the third direction z is larger, that is, the continuous uninterrupted magnetic circuit sectional area is larger, and the influence of the resistance between the magnetic circuit of the plate-type magnetic core 12 and the magnetic circuit of the drum-type magnetic core 11 (equivalent to open circuit) on the magnetic circuit resistance of the whole pulse transformer 10 is reduced, so that for the whole pulse transformer 10, the magnetic circuit sectional area of the pulse transformer 10 is increased, the resistance of the magnetic circuit is reduced, and the pulse transformer 10 has higher inductance under the design of limited height, thereby realizing the consideration of high inductance and small-size design.

Alternatively, the magnetic path cross-sectional area of the winding core 111 is S₁The cross-sectional area of the magnetic path of the plate-shaped core 12 is S₂，S₂＝k₁*S₁And k is₁Not less than 0.5. The sectional area of the magnetic path of the plate-shaped magnetic core 12 is 0.5 times or more of the sectional area of the magnetic path of the winding core 111, so that the plate-shaped magnetic core 12 has a predetermined sectional area of the magnetic path under the condition of reducing the resistance of the magnetic path, and the design of the magnetic path of the traditional surface-mounted pulse transformer is satisfied.

In some embodiments, the distance between the two side cores 112 is D₁The length of the winding core 111 in the second direction is D₂，D₂＝k₂*D₁And 1 < k₂Less than or equal to 1.5. By setting the threshold value, the width of the winding core 111 is larger than the distance between the two side cores 112, which is advantageous in that the winding core 111 has a larger sectional area, thereby allowing the winding core 111 to have a larger magnetic path sectional area.

The winding core portion 111, the side core portion 112, and the plate-shaped magnetic core 12 may be made of a sintered body of a magnetic material having a high magnetic permeability, including, but not limited to, at least one of nickel-zinc-based ferrite and manganese-zinc-based ferrite. These magnetic materials not only have a high magnetic permeability but also have a low intrinsic resistance.

Alternatively, in order to easily design the magnetic path sectional area of the winding core portion 111, the center of the winding core portion 111 is located on the central axis of the winding core portion 111 in the first direction x. That is, the core portion 111 is a structural element that is symmetrical as a whole. The winding core 111 may have a rod-like structure, for example, any one of a rectangular body, a cylindrical body, and a prism body. The side core portion 112 may be of an integrally molded structure with the core portion 111.

In some embodiments, the distance H between the center of the roll core 111 and the first end of the side core 112 in the third direction z₁Is greater than the distance H between the center of the winding core 111 and the second end of the side core 112₂The first end and the second end are oppositely arranged along the third direction z. That is, the core portion 111 is closer to the plate-shaped magnetic core 12, and here, the distance between the core portion 111 and the first end of the side core portion 112 is larger, so that it is possible to prevent other solders (e.g., solders when the winding 13 and the side core portion 112 are soldered) from adhering to the winding 13, and it is also possible to reduce the magnetic path length of the pulse transformer 10 in the third direction z.

Optionally, the plate-shaped magnetic core 12 and the side core portion 112 are bonded by glue, and the distance between the two is D₃And 0 < D₃Less than or equal to 10 mu m. The gap between the plate-shaped core 12 and the drum-shaped core 11 is controlled to be 10 μm or less, and a smaller gap is advantageous for reducing the magnetic resistance of the magnetic circuit. In some scenarios, a smaller particle size adhesive may be used to bond the second end of the side core portion 112 to the slab core 12.

Referring to fig. 1, optionally, an electrode 113 is disposed at an end (i.e., a first end) of the two side core portions 112 facing away from the slab core, and the winding 13 is correspondingly connected to the electrode 113. Other embodiments may provide that only one electrode 113 of the side core portion 112 is connected to the winding wire 13. It should be understood that the winding manner of the winding wire 13 on the winding core portion 111 should be set according to the actual required adaptability, and the embodiment of the present application is not limited thereto.

In some scenarios, the wire 13 and the electrode 113 may be bonded by thermocompression. The electrode 113 and the side core 112 may be made of different materials, for example, a layer structure formed of a material such as nickel zinc.

The embodiment of the present application further provides an electronic device, which includes the pulse transformer 10 of any one of the foregoing embodiments, and therefore, the electronic device can produce the beneficial effects of the pulse transformer 10 of the corresponding embodiment.

The pulse transformer 10 is provided in a circuit of an electronic device. Electronic devices can be implemented in various specific forms, for example, electronic products such as smart phones, wearable devices, unmanned aerial vehicles, electric cleaning tools, energy storage products, electric vehicles, electric bicycles, electric navigation tools, and the like. It will be understood by those skilled in the art that the configuration according to the embodiment of the present application can be applied to a fixed type of electronic device, in addition to elements particularly for moving purposes.

It should be understood that the above-mentioned embodiments are only some examples of the present application, and not intended to limit the scope of the present application, and all structural equivalents made by those skilled in the art using the contents of the present specification and the accompanying drawings are also included in the scope of the present application.

Although the terms "first, second, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Although step numbers such as S12 and S13 are used herein, the purpose is to briefly describe the corresponding content more clearly, and not to constitute a substantial limitation on the sequence, and in the specific implementation, S13 may be executed first, then S11 may be executed, and these steps are all within the protection scope of the present application.

Claims (10)

1. A pulse transformer is characterized by comprising a drum-shaped magnetic core, a plate-shaped magnetic core and a winding,

the drum-type magnetic core comprises a winding core part and two side core parts, the winding is wound on the winding core part, the two side core parts are respectively arranged at two ends of the winding core part, which are oppositely arranged along a first direction, and the side core parts protrude out of the winding core part after winding along a third direction; the third direction is perpendicular to the first direction;

and the slab magnetic core is arranged at one end of the two side core parts, which protrudes out of the winding core part, along the third direction, and the magnetic path sectional area of the slab magnetic core is smaller than or equal to that of the winding core part.

2. The pulse transformer according to claim 1, wherein the magnetic path cross-sectional area of the winding core portion is S₁The magnetic circuit of the plate-shaped magnetic core has a cross-sectional area S₂，S₂＝k₁*S₁And k is₁≥0.5。

3. Pulse transformer according to claim 1, characterized in that the distance between the two side cores is D₁The length of the roll core part along the second direction is D₂The first direction, the second direction and the third direction are perpendicular to each other, D₂＝k₂*D₁And 1 < k₂≤1.5。

4. The pulse transformer according to claim 1, wherein a distance between the slab core and the side core is D₃And 0 < D₃≤10μm。

5. The pulse transformer of claim 4, wherein said slab core and said side core are adhesively bonded therebetween.

6. The pulse transformer of claim 1, wherein a center of the roll core is located on a central axis of the roll core in the first direction.

7. The pulse transformer of claim 6, wherein, in the third direction, a distance between a center of the roll core and the side core first end is greater than a distance between the center and the side core second end, the first end and the second end being disposed opposite in the third direction.

8. The pulse transformer according to claim 6, wherein the winding core is any one of a rectangular body and a cylindrical body.

9. The pulse transformer according to claim 1, wherein an end of at least one of the two side cores facing away from the slab core is provided with an electrode, and the wire is connected to the electrode.

10. An electronic device, characterized in that the electronic device comprises a pulse transformer according to any one of claims 1 to 9.

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