CN219202919U - Winding transformer - Google Patents

Abstract

The application provides a wire winding transformer relates to transformer technical field, includes: the coil is wound on a middle column of the I-shaped magnetic core, and two ends of the coil are respectively connected with pin electrodes at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic chip, and the I-shaped magnetic core and the magnetic chip form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the middle column, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the middle column, is an ineffective magnetic circuit; the effective magnetic circuit part forms a U-shaped magnetic core, and the ineffective magnetic circuit part is an insulating base. Adopt the U type magnetic core of higher permeability, can effectively promote the product inductance volume, can also reduce resistance and wire winding number of turns, promote the high frequency ability of Insertion Loss and Return Loss to the anti saturation capacity of magnetic core B max, and then promote the whole electrical property of product.

Description

Winding transformer

Technical Field

The application relates to the technical field of transformers, in particular to a winding transformer.

Background

At present, the magnetic core selected by the common high-speed winding transformer is required to have extremely high resistivity rho for insulation with the terminal electrode, usually a nickel zinc ferrite magnetic core with the magnetic conductivity mu i of more than 10 cm < 6 > omega.m is selected, the magnetic conductivity mu i is only selected from 0 to 3000, and the improvement of inductance index is greatly limited. Therefore, the inductance index is improved by increasing the winding turns. However, after the number of windings is increased, the dc resistance DCR becomes large, the winding space becomes insufficient, and the high-frequency transmission characteristics are degraded.

Disclosure of Invention

An object of the embodiment of the application is to provide a winding transformer, which can improve the magnetic permeability of an effective magnetic circuit part and improve the inductance of a product.

In one aspect of the embodiment of the application, a winding transformer is provided, which comprises an I-shaped magnetic core, wherein a coil is wound on a center post of the I-shaped magnetic core, and two ends of the coil are respectively connected with pin electrodes at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic chip, and the I-shaped magnetic core and the magnetic chip form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the middle column, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the middle column, is an ineffective magnetic circuit; the effective magnetic circuit part forms a U-shaped magnetic core, and the ineffective magnetic circuit part is an insulating base.

Optionally, the insulation base and the U-shaped magnetic core are clamped by a clamping structure.

Optionally, the clamping structure includes set up respectively in the boss on two tops of U type magnetic core, and set up respectively in the recess of two bottoms of insulating base, the recess with the boss matches.

Optionally, an adhesive is filled between the boss and the groove.

Optionally, a plurality of positioning slots are formed on two top ends of the insulating base respectively, and each positioning slot is formed with at least a first mounting position and a second mounting position for connecting different pin electrodes.

Optionally, the pin electrode includes a first pin electrode, two opposite side walls of the positioning notch are recessed toward a center of the positioning notch, so that a clamping groove is formed on the side walls as the first mounting position, and the clamping groove is used for clamping the first pin electrode.

Optionally, the pin electrode includes a second pin electrode, and the positioning notch is provided with a pin port as the second installation position, where the pin port is used for plugging the second pin electrode.

Optionally, the pin electrode and the positioning notch are fixed by injection molding, plugging or bonding.

Optionally, the material of U type magnetic core is ferrite, insulating base's material includes electric timber, pottery, FR4 at least.

The winding transformer provided by the embodiment of the application adopts the I-shaped magnetic core, the coil is wound on the middle column of the I-shaped magnetic core, and two ends of the coil are respectively connected with the pin electrodes at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic core piece, and the I-shaped magnetic core and the magnetic core piece form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the center pillar, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the center pillar, is an ineffective magnetic circuit; the effective magnetic circuit part forms a U-shaped magnetic core, and the ineffective magnetic circuit part is an insulating base; thus, the U-shaped magnetic core is used as an effective magnetic circuit part, and ferrite with higher magnetic permeability can be selected; the insulating base is used as an ineffective magnetic circuit part, and insulating materials such as electric timber, ceramics, circuit board materials (PCB) or glass fiber epoxy resin copper-clad plates (FR 4 PCB) can be selected. The U-shaped magnetic core and the magnetic core piece below form a closed magnetic circuit to provide corresponding magnetic fields for the transformer. Through divide into U type magnetic core and insulating base with I shape magnetic core, adopt the U type magnetic core of higher permeability, can effectively promote the product inductance value, can also reduce resistance and wire winding number of turns, promote Insertion Loss and Return Loss's high frequency ability to and the anti saturation capacity of magnetic core B max, and then promote the whole electrical property of product.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a winding transformer according to the present embodiment;

FIG. 2 is a schematic diagram of a second embodiment of a winding transformer;

fig. 3 is a schematic diagram of a U-shaped magnetic core structure of the wound transformer according to the present embodiment;

fig. 4 is a schematic diagram of an insulation base structure of a winding transformer according to the present embodiment;

FIG. 5 is a second schematic diagram of an insulation base of the winding transformer according to the present embodiment;

fig. 6 is a schematic diagram of an insulation base and a pin electrode adaptation of a winding transformer according to the present embodiment.

Icon: a 101-U-shaped magnetic core; 101 a-a boss; 102-an insulating base; 102 a-grooves; 102 b-positioning slots; 102b 1-a clamping groove; 102b 2-pin opening; 103-a magnetic chip; 104-coil; 1041-a first coil; 1042-a second coil; 105-pin electrodes; 1051-U-shaped pin electrode; 1052-J-type lead electrode; 1053-L-type pin electrode; 1054-type I pin electrode.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It should also be noted that the terms "disposed," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically defined and limited; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

When the inductance index is improved by increasing the winding number, the direct current resistor DCR becomes large, so that the winding space is insufficient, and the high-frequency transmission characteristics of Insertion Loss and Return Loss are reduced. The end electrode of the magnetic core is metallized, silver or copper is firstly plated, then nickel plating and tin plating are performed, the weldability is easy to lose efficacy, the phenomena of broken wires and virtual welding are easy to occur, the mechanical strength is low, the wire diameter can be only below 0.13mm, the material selection range is very narrow, and the welding mode is also limited.

In view of the above, in order to solve the above problems, an embodiment of the present application provides a winding transformer, which can increase the inductance of a product, reduce the resistance and the number of windings, and increase the high-frequency capability of Insertion Loss and Return Loss, and the anti-saturation capability of the magnetic core B max; the magnetic material and the wire can be widely selected, the welding mode has diversified choices, and finally the electric characteristics, the weldability, the mechanical impact resistance and other reliability requirements of the product are improved.

Specifically, referring to fig. 1, a winding transformer provided in an embodiment of the present application includes: the coil 104 is wound on the middle column of the I-shaped magnetic core, and two ends of the coil 104 are respectively connected with pin electrodes 105 at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic core piece 103, and the I-shaped magnetic core and the magnetic core piece 103 form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the center pillar, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the center pillar, is an ineffective magnetic circuit; the effective magnetic path portion forms a U-shaped magnetic core 101, and the ineffective magnetic path portion is an insulating base 102.

As shown in fig. 2, the i-shaped magnetic core is divided into two parts, including a lower part and a U-shaped magnetic core 101 connected with a magnetic core piece 103, in order to retain ferrite of an effective magnetic circuit part, an upper part of an ineffective magnetic circuit part is an insulating base 102, so that the U-shaped magnetic core 101 of the lower part can use ferrite with higher magnetic permeability; the insulating base 102 is provided with metal lead electrodes 105, and different metal lead electrodes 105 are connected to both ends of the coil 104, and the coil 104 is wound around a center leg of the i-shaped magnetic core, for example. For example, the coils 104 have two different types, the coils 104 of the two different types are wound on the center pillar in a staggered manner, and two ends of each coil 104 are respectively connected to the pin electrodes 105 on two top ends of the i-shaped magnetic core. In fig. 1, a first coil 1041 and a second coil 1042 are provided, the first coil 1041 and the second coil 1042 are arranged at intervals, two ends of the first coil 1041 are respectively disposed on different pin electrodes 105 on two top ends of the insulating base 102, and two ends of the second coil 1042 are respectively disposed on different pin electrodes 105 on two top ends of the insulating base 102.

The U-shaped core 101 can select a higher magnetic permeability, and then forms a closed magnetic circuit with the lower core piece 103 to provide a corresponding magnetic field for the transformer.

Therefore, the winding transformer provided by the embodiment of the application adopts the I-shaped magnetic core, the coil 104 is wound on the middle column of the I-shaped magnetic core, and two ends of the coil 104 are respectively connected with the pin electrodes 105 at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic core piece 103, and the I-shaped magnetic core and the magnetic core piece 103 form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the center pillar, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the center pillar, is an ineffective magnetic circuit; the effective magnetic circuit part forms a U-shaped magnetic core 101, and the ineffective magnetic circuit part is an insulating base 102; in this way, the U-shaped magnetic core 101 can be used as an effective magnetic path part, and ferrite with higher magnetic permeability can be selected; the insulating base 102 is used as an ineffective magnetic circuit part, and can be made of insulating materials such as electrical timber, ceramics, circuit board materials (PCB) or glass fiber epoxy resin copper-clad plates (FR 4 PCB). The U-shaped core 101 and the lower core piece 103 form a closed magnetic circuit providing a corresponding magnetic field for the transformer. Through divide into U type magnetic core 101 and insulating base 102 with the I shape magnetic core, adopt the U type magnetic core of higher permeability, can effectively promote the product inductance value, can also reduce resistance and wire winding number of turns, promote the high frequency ability of Insertion Loss and Return Loss to and the anti saturation capacity of magnetic core B max, and then promote the whole electric property of product.

On the basis, the insulation base 102 and the U-shaped magnetic core 101 are clamped by a clamping structure. Specifically, as shown in fig. 3, the clamping structure includes bosses 101a respectively disposed at two top ends of the U-shaped magnetic core 101, and grooves 102a respectively disposed at two bottom ends of the insulating base 102, where the grooves 102a are matched with the bosses 101 a.

Bosses 101a are respectively formed on the two top ends of the U-shaped magnetic core 101, and the bosses 101a protrude from the surfaces of the two top ends of the U-shaped magnetic core 101; accordingly, as shown in fig. 4, grooves 102a are formed at both bottom ends of the insulating base 102, respectively, and the grooves 102a are engaged on the boss 101a, so that the insulating base 102 and the U-shaped magnetic core 101 are connected.

It should be understood that the above-mentioned manner of matching the boss 101a and the groove 102a is merely an example of connecting the U-shaped magnetic core 101 and the insulating base 102, and the present application is not limited thereto, as long as the connection manner of fixing the U-shaped magnetic core 101 and the insulating base 102 without deviation is provided, and those skilled in the art may specifically set the connection manner as required.

Further, in order to improve the connection firmness, an adhesive is filled between the boss 101a and the groove 102 a. Epoxy glue is filled in the groove 102a, so that the insulation base 102 and the U-shaped magnetic core 101 are bonded without deformation, deflection, warping and other anomalies, and the connection quality is guaranteed.

Thus, a pin electrode 105 path is formed at the top end of the insulating base 102 for connecting different pin electrodes 105. Illustratively, as shown in fig. 5, a plurality of positioning notches 102b are formed on both top ends of the insulating base 102, respectively, and each positioning notch 102b is formed with at least a first mounting position and a second mounting position for connecting different pin electrodes 105.

The positioning notch 102b is formed at the top end of the insulating base 102, and the positioning notch 102b forms different mounting positions for mounting different pin electrodes 105.

In one implementation of the present application, the pin electrode 105 includes a first pin electrode 105, and two opposite sidewalls of the positioning notch 102b are recessed toward a center of the positioning notch 102b to form a clamping groove 102b1 at the sidewalls as a first mounting position, and the clamping groove 102b1 is used for clamping the first pin electrode 105.

The two opposite side walls of the positioning notch 102b are recessed inwards to form a clamping groove 102b1, and the clamping groove 102b1 can be clamped and mounted with the first pin electrode 105.

In another implementation of the present application, the pin electrode 105 includes a second pin electrode 105, and the positioning slot 102b is provided with a pin hole 102b2 as a second installation position, where the pin hole 102b2 is used for plugging the second pin electrode 105.

The pin opening 102b2 is located at the top of the positioning notch 102b for plug-in mounting of the plug-in second pin electrode 105.

In this way, the same positioning slot 102b can provide at least two mounting modes of the pin electrode 105, so as to provide various pin electrode 105 schemes for the transformer, and the SMD and THD are selectable. The insulating base 102 and the terminal metal of the pin electrode 105 can be directly pressed and formed through an injection molding process, or the pin electrode 105 terminal can be mounted on the insulating base 102 by adopting a bending and disassembling and pin inserting process, or the region of the path of the pin electrode 105 provided with the positioning notch 102b can be coated with epoxy glue, and the pin electrode 105 terminal is fixed on the insulating base 102 in an adhesive mode.

The pin electrodes 105 are of different types, for example, as shown in fig. 6, for example, there are a U-shaped pin electrode 1051, a J-shaped pin electrode 1052, an L-shaped pin electrode 1053 and an I-shaped pin electrode 1054, wherein the U-shaped pin electrode 1051 has two clamping ends, and the two clamping ends are respectively and correspondingly clamped with two clamping grooves 102b1 on two sides of the positioning notch 102b, so that the U-shaped pin electrode 1051 is mounted on the positioning notch 102b, and fig. 1 is a mounting schematic diagram of the U-shaped pin electrode 1051 and the insulating base 102; the J-shaped lead electrode 1052 has a clamping end which can be clamped with the clamping groove 102b1 on one side of the positioning notch 102b to complete the installation of the J-shaped lead electrode 1052.

Alternatively, for example, one end of the L-shaped lead electrode 1053 may be inserted into the pin hole 102b2 of the positioning slot 102b, and the installation of the L-shaped lead electrode 1053 and the insulating base 102 may be completed; it is also possible to have one end inserted into the pin hole 102b2 as in the case of the I-type lead electrode 1054, so that the I-type lead electrode 1054 is mounted on the insulating base 102.

Illustratively, the pin hole 102b2 is shown as a square, which is not limited in this application, and the pin hole 102b2 may have other shapes such as a circular shape, as long as it matches the shape of the end of the pin electrode 105.

The pin electrode 105 and the positioning notch 102b are fixed by injection molding, splicing or bonding, and the like, so that the pin electrode 105 and the insulating base 102 are mounted.

In summary, the prior transformer is limited by functional insulation requirements, the originally adopted i-shaped magnetic core can only use nickel-zinc materials, and the inductance value can be increased by increasing Ur according to an inductance calculation formula of L=N2×U0×Ur s/L, but the limit level of the current nickel-zinc magnetic permeability is up to 3000MAX, so that the inductance can only be increased by increasing the number of N coils 104, but direct current and high-frequency insertion loss can be increased, and the influence on the transformer index is great; therefore, under the condition of a certain inductance value, the mode of optimally saving resources and improving the electrical characteristics is selected by adopting high magnetic conductance and low number of turns.

Therefore, the winding transformer provided by the embodiment of the application adopts the I-shaped magnetic core, and the I-shaped magnetic core is divided into two materials, so that the U-shaped magnetic core 101 of the effective magnetic circuit part can select high magnetic permeability with a wider range of 0-15000, and nickel-zinc magnetic core ferrite or manganese-zinc magnetic core ferrite can be selected; the ineffective magnetic circuit part adopts PM960 or PM9820 electrical timber, ceramic, or circuit board material (PCB), or glass fiber epoxy resin copper-clad plate (FR 4 PCB) and the like as the insulating base 102, and plays an insulating isolation role of more than 100MΩ level between the pin electrode 105 and the magnetic core. In addition, in order to better bond the U-shaped magnetic core 101 and the insulating base 102, the insulating base 102 and the U-shaped magnetic core 101 are in a concave-convex matching structure, the inside of the groove 102a of the insulating base 102 can be provided with roughness lines, the bonding force can be improved, and the assembled insulating base is not easy to deform. The pin electrode 105 is partially made of PB and CP wire terminals, and is used for selecting an SMD or THT according to market demands, wherein the SMD process is fixed by injection molding or bending molding or epoxy glue coating, and the THT process is connected with the electric seat base by a pin manner. Compared with the traditional metallization electroplating process, the terminal structure adopts a spot welding process in a general lead welding mode, the wire diameter of the terminal structure is limited, more than 0.12 wire diameter can be processed, otherwise, the phenomenon of fatal defect to weldability caused by breakage of a fracturing bonding pad or a magnetic core, tin void of the bonding pad, paint film residue and the like can occur, the mechanical strength capability is poor, the pin electrode 105 is set to be a diversified alternative scheme, besides spot welding, the hot dip welding scheme can be adopted more, so that the reliability requirements of weldability, mechanical impact resistance and the like of a product are improved, and therefore, the performance of the sheet type high-speed winding transformer can be greatly improved, and the winding transformer has the electrical characteristics of high inductance, low resistance, low loss and the like, and also has the advantages of small volume, good weldability, mechanical impact resistance and the like.

The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (9)

1. A wound transformer, comprising: the coil is wound on a middle column of the I-shaped magnetic core, and two ends of the coil are respectively connected with pin electrodes at two top ends of the I-shaped magnetic core; the bottom end of the I-shaped magnetic core is also provided with a magnetic chip, and the I-shaped magnetic core and the magnetic chip form a closed magnetic circuit; the part of the I-shaped magnetic core, which is positioned below the top surface of the middle column, is an effective magnetic circuit, and the part of the I-shaped magnetic core, which is positioned above the top surface of the middle column, is an ineffective magnetic circuit; the magnetic circuit is characterized in that the effective magnetic circuit part forms a U-shaped magnetic core, and the ineffective magnetic circuit part is an insulating base.

2. The wound transformer of claim 1, wherein the insulating base and the U-shaped core are clamped together by a clamping structure.

3. The winding transformer according to claim 2, wherein the clamping structure comprises bosses respectively arranged at two top ends of the U-shaped magnetic core, and grooves respectively arranged at two bottom ends of the insulating base, and the grooves are matched with the bosses.

4. A wound transformer according to claim 3, wherein adhesive is filled between the boss and the recess.

5. The wound transformer according to any one of claims 1 to 4, wherein a plurality of positioning notches are formed on both top ends of the insulating base, respectively, each of the positioning notches being formed with at least a first mounting position and a second mounting position for connecting different ones of the pin electrodes.

6. The wound transformer of claim 5, wherein the pin electrode comprises a first pin electrode, and two opposing sidewalls of the locating slot are recessed toward a center of the locating slot to form a snap-fit slot in the sidewalls as the first mounting location, the snap-fit slot for snap-fitting the first pin electrode.

7. The wound transformer of claim 5, wherein the pin electrode comprises a second pin electrode, and the positioning notch is provided with a pin opening as the second mounting position, and the pin opening is used for plugging the second pin electrode.

8. The wound transformer of claim 5, wherein the pin electrodes and the locating slots are secured by injection molding, plugging, or bonding.

9. The wound transformer of claim 1, wherein the U-shaped core is ferrite and the insulating base is made of at least electrical wood, ceramic, and FR4.

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