阅读说明：本技术 变压器及充电装置 (Transformer and charging device ) 是由 徐峰 李建国 于 2021-07-21 设计创作，主要内容包括：本申请涉及变压器及充电装置。所述变压器包括间隔相对设置的第一磁性板与第二磁性板和磁导柱,所述磁导柱的两端分别连接于所述第一磁性板和所述第二磁性板；其中,所述第一磁性板、所述第二磁性板两者中的至少一个的饱和磁通密度大于所述磁导柱的饱和磁通密度。充电装置包括壳体和变压器,所述壳体包括容置空间,所述变压器收容于所述容置空间中。通过上述方式,可减小第一磁性板和/或第二磁性板的纵截面面积,以减小第一磁性板和/或第二磁性板的厚度、缩小变压器尺寸。(The present application relates to a transformer and a charging device. The transformer comprises a first magnetic plate, a second magnetic plate and a magnetic guide column which are oppositely arranged at intervals, and two ends of the magnetic guide column are respectively connected to the first magnetic plate and the second magnetic plate; wherein a saturation magnetic flux density of at least one of the first magnetic plate and the second magnetic plate is greater than a saturation magnetic flux density of the magnetic guide pillar. The charging device comprises a shell and a transformer, wherein the shell comprises an accommodating space, and the transformer is accommodated in the accommodating space. Through the mode, the longitudinal section area of the first magnetic plate and/or the second magnetic plate can be reduced, so that the thickness of the first magnetic plate and/or the second magnetic plate can be reduced, and the size of the transformer can be reduced.)

1. A transformer, comprising:

the first magnetic plate and the second magnetic plate are oppositely arranged at intervals; and

the two ends of the magnetic guide pillar are respectively connected to the first magnetic plate and the second magnetic plate;

wherein a saturation magnetic flux density of at least one of the first magnetic plate and the second magnetic plate is greater than a saturation magnetic flux density of the magnetic guide pillar.

2. The transformer of claim 1, wherein at least one of the first magnetic plate and the second magnetic plate is made of a metal soft magnetic powder core, and the magnetic pillars are made of a ferrite magnetic material.

3. The transformer according to any one of claims 1-2, wherein one of the first magnetic plate and the second magnetic plate and the magnetic guide pillar are made of ferrite magnetic material and are integrally formed, and the other of the first magnetic plate and the second magnetic plate is made of soft magnetic metal powder core.

4. The transformer according to any one of claims 1-2, wherein the magnetic columns comprise a first magnetic column, a second magnetic column and a third magnetic column which are arranged side by side and arranged with a gap therebetween, and two ends of the first magnetic column, the second magnetic column and the second magnetic column are respectively connected to the first magnetic plate and the second magnetic plate.

5. The transformer according to any one of claims 1-2, wherein the magnetic pillars comprise first and second magnetic pillars arranged with a gap therebetween, and both ends of the first and second magnetic pillars are connected to the first and second magnetic plates, respectively.

6. The transformer of claim 1, further comprising a layer of magnetic glue between the magnetic pillars and the first magnetic plate and/or the magnetic pillars and the second magnetic plate.

7. The transformer according to claim 6, wherein the material of the magnetic adhesive layer is a mixture of at least one of epoxy resin, polyurethane and silicone resin and magnetic material powder.

8. The transformer of claim 1, further comprising a magnetic protection layer having a receiving cavity, wherein the first magnetic plate, the second magnetic plate and the magnetic conductive pillar are received in the receiving cavity and respectively attached to an inner wall of the receiving cavity.

9. The transformer according to claim 1, wherein the magnetic protective layer is made of a mixture of plastic and magnetic powder.

10. A charging device, comprising:

a housing including an accommodating space; and

the transformer of any one of claims 1-9, wherein the transformer is accommodated in the accommodating space.

Technical Field

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

Background

At present, electronic equipment such as mobile phones and the like increasingly become an essential part in life of people, and in order to meet the normal use of the electronic equipment of people and shorten the charging time, a high-power charging device becomes extremely important. The transformer is the core part of charging device, and its size directly determines charging device's thickness and size, and the transformer volume among the prior art is generally bigger partially for charging device's mention is difficult to compress, and is inconvenient to go on a journey and carries.

Disclosure of Invention

The application provides a transformer and a charging device.

An embodiment of the present application provides a transformer, including:

the first magnetic plate and the second magnetic plate are oppositely arranged at intervals; and

the two ends of the magnetic guide pillar are respectively connected to the first magnetic plate and the second magnetic plate;

wherein a saturation magnetic flux density of at least one of the first magnetic plate and the second magnetic plate is greater than a saturation magnetic flux density of the magnetic guide pillar.

An embodiment of the present application further provides a charging device, including:

a housing including an accommodating space; and

the transformer is contained in the containing space.

According to Φ ═ BS, the transformer provided in the embodiment of the present application can be seen that, under the condition that the magnetic flux is not changed, the saturation magnetic flux density of the first magnetic plate and/or the second magnetic plate is increased and made to be greater than the saturation magnetic flux density of the magnetic guide pillars, and then the longitudinal cross-sectional area of the first magnetic plate and/or the second magnetic plate is reduced, so as to achieve the purpose of reducing the thickness of the first magnetic plate and/or the second magnetic plate and reducing the size of the transformer.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a charging device provided in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a transformer in a prior art charging apparatus;

fig. 3 is a schematic cross-sectional view of a transformer in the charging device shown in fig. 1;

FIG. 4 is a schematic cross-sectional view taken along A-A of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is a schematic cross-sectional view of a variation of the transformer shown in FIG. 3;

FIG. 7 is a schematic cross-sectional view of yet another variation of the transformer shown in FIG. 3;

FIG. 8 is a cross-sectional schematic view of one embodiment of the transformer shown in FIG. 3;

FIG. 9 is a schematic cross-sectional view of a transformer according to an embodiment of the present application;

FIG. 10 is a schematic cross-sectional view taken along the line C-C shown in FIG. 9;

FIG. 11 is a schematic cross-sectional view taken along direction D-D of FIG. 9;

FIG. 12 is a schematic cross-sectional view of a variation of the transformer shown in FIG. 9;

fig. 13 is a schematic cross-sectional view of yet another variation of the transformer shown in fig. 9.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a charging device according to an embodiment of the present disclosure. The present application provides a charging device 1000. Specifically, the charging apparatus 1000 may charge electronic devices such as a mobile phone or a smart phone (e.g., an iPhone-based phone), a Portable game device (e.g., a Nintendo DS, a PlayStation Portable, a game Advance, an iPhone), a laptop computer, a PDA, a Portable internet device, a music player, and a data storage device.

The charging device 1000 may include a transformer 100 and a housing 200, where the housing 200 has an accommodating space 201, and the accommodating space 201 is used for accommodating the transformer 100. The material of the housing 200 may be an insulating material such as plastic, ceramic, or glass, and is used for isolating and protecting the structures such as the transformer 100.

Fig. 2 is a schematic cross-sectional view of a transformer in a charging device according to the prior art.

In the prior art, the transformer 600 is made of ferrite such as manganese-zinc ferrite, and since the magnetic saturation flux density of manganese-zinc ferrite is generally only 0.5T, the magnetic saturation flux density of manganese-zinc ferrite is easily saturated under high magnetic field excitation (large alternating current). Once magnetic saturation occurs, the harmfulness to the charging device is extremely high, so that the components are overheated if the magnetic saturation occurs, and the components are damaged if the magnetic saturation occurs.

It should be noted that the terms "first", "second" and "third" in the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

Taking the EI-type magnetic conductive pillar transformer 600 as an example, the transformer 600 includes a first magnet 601, a second magnet 602, and a PCB603, where the first magnet 601 is "E" shaped, the second magnet 602 is "I" shaped (so it can be called as a second magnetic plate 602), and a first coil and a second coil are disposed in the PCB 603. The first magnet 601 includes a first magnetic plate 6011, a first magnetic column 6012, a second magnetic column 6013, and a third magnetic column 6014, which are integrally formed, wherein the first magnetic column 6012, the second magnetic column 6013, and the third magnetic column 6014 are sequentially arranged side by side and are disposed at intervals, and the second magnetic column 6013 is located in the middle of the first magnetic column 6012. One end of each of the first magnetic column 6012, the second magnetic column 6013, and the third magnetic column 6014, which is far from the first magnetic plate 6011, abuts against the second magnetic plate 602, wherein the first magnetic column 6012, the first magnetic plate 6011, the second magnetic column 6013, and the second magnetic plate 602 form a first closed magnetic circuit, and the third magnetic column 6014, the first magnetic plate 6011, the second magnetic column 6013, and the second magnetic plate 602 form a second closed magnetic circuit, that is, the first closed magnetic circuit and the second closed magnetic circuit share the second magnetic column 6013. The first coil and the second coil are arranged on the second magnetic column 6013 in a penetrating manner and located between the first magnetic column 6012 and the third magnetic column 6014, the first coil may be communicated with an alternating current to generate an electromagnetic field, and the second coil may generate an induced current under the action of the electromagnetic field. Specifically, the input voltage of the first coil is U1, the number of turns of the second coil is N1; the induction voltage of the second coil is U2, and the number of turns of the second coil 22 is N2; wherein the following relationship exists between the first coil 12 and the second coil 22: U1/N1 is U2/N2, that is, U1 is U2N 1/N2. Wherein the frequency range of the alternating current of the first coil 22 is 100KHz-200 MHz.

It is to be understood that when the magnetic field area (i.e., the area of a plane perpendicular to the magnetic field direction in the magnetic field range) of the first magnetic plate 6011 or the second magnetic plate 6012 is smaller than the cross-sectional area of the first magnetic column, the magnetic flux of the transformer 600 depends on the minimum value of the magnetic field areas of the first magnetic plate 6011 and the second magnetic plate 6012, that is, the saturation magnetic flux of the transformer 600 is controlled by the minimum value of the magnetic fluxes of the first magnetic plate 6011 and the second magnetic plate 6012.

When the magnetic flux of the transformer 600 is saturated, the inductance of the first coil is significantly reduced, so that the dc resistance (copper resistance) of the first coil and the power consumption of the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) of the internal power switch are rapidly increased, which causes a rapid increase in the current of the first coil, and may cause the current limiting circuit inside the top switch to be out of the way and the MOSFET to be damaged. The main phenomenon of the transformer 600 during magnetic saturation fault is as follows: firstly, the transformer 600 is very hot, and the TOPSwitch chip is overheated; and secondly, when the load is increased, the output voltage drops rapidly, and the designed output power cannot be reached.

In order to prevent the magnetic circuit of transformer 600 from being saturated, the end of second magnetic column 6013 away from first magnetic plate 6011 is spaced apart from second magnetic plate 602, that is, a gap 6021 exists between the end of second magnetic column 6013 away from first magnetic plate 6011 and second magnetic plate 602. Since the air gap has linear magnetic resistance and the air gap has relatively large magnetic resistance, and the manganese-zinc ferrite has very small magnetic resistance and has saturated non-saturated linear characteristics, the end of the second magnetic column 6013 away from the first magnetic plate 6011 is spaced from the second magnetic plate 602, so that the magnetic circuit can be prevented from being saturated. However, such design reduces the conversion efficiency of the first coil and the second coil, which wastes electric energy, and increases the size of the transformer 600. In view of this, it is necessary to provide a new transformer 100.

Referring to fig. 3, fig. 3 is a schematic cross-sectional view of a transformer in the charging device shown in fig. 1. The embodiments of the application provide a transformer 100, which may include a first magnetic plate 10, a second magnetic plate 20, and a magnetically permeable column 30. The first magnetic plate 10 and the second magnetic plate 20 are disposed at an interval, the magnetic guide pillar 30 is located between the first magnetic plate 10 and the second magnetic plate 20, and two ends of the magnetic guide pillar 30 are respectively connected to the first magnetic plate 10 and the second magnetic plate 20. The saturation flux density of the first magnetic plate 10 is greater than the saturation flux density of the magnetic guide post 30, or the saturation flux density of the second magnetic plate 20 is greater than the saturation flux density of the magnetic guide post 30, or the saturation flux densities of the first magnetic plate 10 and the second magnetic plate 20 are both greater than the saturation flux density of the magnetic guide post 30. That is, the saturation magnetic flux density of at least one of the first and second magnetic plates 10 and 20 is greater than the saturation magnetic flux density of the magnetic pole 30.

It is understood that the first magnetic plate 10, the second magnetic plate 20 and the magnetic body constitute a closed loop, such as an EI-type magnetic core transformer 100 or a UI-type magnetic transformer 100.

Referring to fig. 4 and 5 together, fig. 4 is a schematic sectional view taken along a-a direction shown in fig. 3, and fig. 5 is a schematic sectional view taken along B-B direction shown in fig. 3.

In this embodiment, the magnetic conductive column 30 may include a first magnetic column 31, a second magnetic column 32, and a third magnetic column 33, the first magnetic column 31, the second magnetic column 32, and the third magnetic column 33 are arranged side by side and disposed with a gap therebetween, and two ends of the first magnetic column, the second magnetic column 32, and the third magnetic column 33 are respectively connected to the first magnetic plate 10 and the second magnetic plate 20. The first magnetic pillar 31, the first magnetic plate 10, the second magnetic pillar 32 and the second magnetic plate 20 form a first closed magnetic circuit 301, and the third magnetic pillar 33, the first magnetic plate 10, the second magnetic pillar 32 and the second magnetic plate 20 form a second closed magnetic circuit 302, that is, the first closed magnetic circuit 301 and the second closed magnetic circuit 302 share the second magnetic pillar 32. Assuming that the cross-sectional area of the first magnetic pillar 31 (i.e., the cross-sectional area parallel to the first magnetic plate 10) is S1, the cross-sectional area of the second magnetic pillar 32 is S2, and the cross-sectional area of the third magnetic pillar 33 is S3, S1+ S3 is S2. Assuming that the area of the longitudinal section of the first magnetic plate 10 (i.e., the section along the length direction of the first magnetic pillar 31) is a1, and the area of the longitudinal section of the second magnetic plate 20 is a2, a1 is equal to a2 which is equal to S2, where Φ is the magnetic flux, B is the magnetic flux density (also referred to as the magnetic field strength), and S is the area of the plane perpendicular to the magnetic field direction in the magnetic field range, the magnetic flux of the second magnetic pillar 32 is equal to the magnetic flux of the first magnetic plate 10 and the magnetic flux of the second magnetic plate 20, respectively, and the magnetic flux of the second magnetic pillar 32 is also equal to the sum of the magnetic fluxes of the first magnetic pillar 31 and the second magnetic pillar 32. That is, under the condition that the magnetic flux is not changed, the saturation magnetic flux density of the first magnetic plate 10 and/or the second magnetic plate 20 is increased, and the longitudinal sectional area S1 of the first magnetic plate 10 and/or the longitudinal sectional area S2 of the second magnetic plate 20 are/is further decreased, so that the purpose of reducing the thickness of the first magnetic plate 10 and/or the second magnetic plate 20 and reducing the size of the transformer 100 is achieved.

Optionally, at least one of the first magnetic plate 10 and the second magnetic plate 20 is made of a metal soft magnetic powder core, and the magnetic conductive columns 30 are made of a ferrite magnetic material. The magnetic core is produced by a special process, and the saturation magnetic flux of the magnetic core is far greater than that of a ferrite magnetic material. The metallic soft magnetic powder core can include, but is not limited to, a FeNi metal powder core, a fesai metal powder core, a FeSCr metal powder core, and table 1 is data comparison of magnetic field saturation strength and magnetic permeability of the FeNi metal powder core, the fesai metal powder core, the FeSCr metal powder core and manganese zinc ferrite.

Table 1: and (3) comparing the magnetic field saturation intensity and magnetic conductivity data of the FeNi metal powder core, the FeSiAl metal powder core and the FeSCr metal powder core with those of the manganese-zinc ferrite.

Material of	Saturation magnetic flux density Bs (T)	Magnetic permeability mu
			FeNi metal powder core	1.6	60-120
FeSiAl metal powder core	1.1	60-120
			FeSCr metal powder core	1.2	60-120
Manganese zinc ferrite	0.43	900-1400

As can be seen from Φ ═ BS, in the case of uniform magnetic flux, the saturation magnetic flux density BS of the metal soft magnetic powder core is much greater than that of the manganese zinc ferrite, that is, the planar area perpendicular to the magnetic field direction in the magnetic field range of the first magnetic plate 10 and/or the second magnetic plate 20 using the metal soft magnetic powder core is much smaller than that in the magnetic field range of the first magnetic plate 10 and/or the second magnetic plate 20 using the manganese zinc ferrite, and in the case that the surface size of the magnetic pole fixed by the first magnetic plate 10 and/or the second magnetic plate 20 is not changed, the thickness of the first magnetic plate 10 and/or the second magnetic plate 20 using the metal soft magnetic powder core is much smaller than that of the first magnetic plate 10 and/or the second magnetic plate 20 using the manganese zinc ferrite, that is, by increasing the saturation magnetic flux density of the first magnetic plate 10 and/or the second magnetic plate 20, and further, the longitudinal sectional area S1 of the first magnetic plate 10 and/or the longitudinal sectional area S2 of the second magnetic plate 20 are reduced, so as to achieve the purpose of reducing the thickness of the first magnetic plate 10 and/or the second magnetic plate 20 and reducing the size of the transformer 100.

Wherein, the metal soft magnetic powder core is subjected to spray granulation and surface treatment by metal magnetic powder (1-50 um), and is subjected to compression molding by a high-tonnage press, and the solid content is 95-99%. The ferrite magnetic material is prepared by mixing metal oxide or carbonate or other compounds which form ferrite through solid phase reaction, ball milling, drying, pressing into a specific shape, presintering at about 1000 ℃, fully grinding and mixing again, adding a proper amount of adhesive, pressing into a required shape or extruding as a plastic substance into a tube, a rod or a strip. And then sintering and forming at 1200-1400 ℃.

Referring to fig. 3, in an embodiment, the first magnetic plate 10 is made of a soft magnetic metal powder core, the magnetic guiding columns 30 are made of a ferrite magnetic material, and the second magnetic plate 20 is made of a ferrite magnetic material. Furthermore, the second magnetic plate 20 and the magnetic guiding column 30 are made of ferrite magnetic materials and are integrally formed, so as to reduce the connection structure between the second magnetic plate 20 and the magnetic guiding column 30. In this case, the transformer 100 is an EI-type magnetic transformer 100, and the transformer 100 can be designed to have a simple structure and better reliability while reducing the size of the transformer 100.

Referring to fig. 6, fig. 6 is a schematic cross-sectional view of a variation of the transformer shown in fig. 3. In another embodiment, the second magnetic plate 20 is made of soft magnetic metal powder, the magnetic conductive columns 30 are made of ferrite magnetic material, and the first magnetic plate 10 is made of ferrite magnetic material. Furthermore, the first magnetic plate 10 and the magnetic guiding column 30 are made of ferrite magnetic materials and are integrally formed, so as to reduce the connection structure between the first magnetic plate 10 and the magnetic guiding column 30. In this case, the transformer 100 is an EI-type magnetic transformer 100, and the transformer 100 can be designed to have a simple structure and better reliability while reducing the size of the transformer 100.

Referring to fig. 7, fig. 7 is a schematic cross-sectional view of another variation of the transformer shown in fig. 3. In a further embodiment, the first magnetic plate 10 and the second magnetic plate 20 are made of soft magnetic metal powder cores, and the magnetic conductive columns 30 are made of ferrite magnetic materials. By such design, the thickness of the transformer 100 can be sufficiently reduced, and the size of the transformer 100 can be reduced.

With reference to fig. 3, optionally, the transformer 100 may further include a magnetic glue layer 40, where the magnetic glue layer 40 is located between the magnetic guide pillar 30 (the first magnetic pillar 31, the second magnetic pillar 32, and the third magnetic pillar 33) and the first magnetic plate 10 and/or between the magnetic guide pillar 30 and the second magnetic plate 20, and is used for bonding the magnetic guide pillar 30 and the first magnetic plate 10 and/or bonding the magnetic guide pillar 30 and the second magnetic plate 20. The saturation flux density of the magnetic glue layer 40 can be 0.7T, the magnetic permeability is between 5 and 30, the saturation flux density of the magnetic glue layer 40 is far greater than that of the magnetic guide pillars 30, that is, the plane size of the magnetic glue layer 40 can be not greater than that of the magnetic guide pillars 30, that is, the magnetic flux of the magnetic guide pillars 30 can be maintained unchanged, and the consistency of the magnetic flux of the transformer 100 can be further ensured.

Referring to fig. 6, in an embodiment, the second magnetic plate 20 and the magnetic guiding column 30 are integrally formed, and one end of the magnetic guiding column 30 away from the second magnetic plate 20 is bonded and fixed to the first magnetic plate 10 through the magnetic glue layer 40, so that not only the magnetic inductance between the first magnetic plate 10 and the magnetic guiding column 30 is increased, but also the first magnetic plate 10 and the magnetic guiding column 30 are fixedly connected.

Referring to fig. 7, in another embodiment, the first magnetic plate 10 and the magnetic guiding column 30 are integrally formed, and one end of the magnetic guiding column 30 away from the first magnetic plate 10 is bonded and fixed to the second magnetic plate 20 through the magnetic glue layer 40, so that the magnetic inductance between the second magnetic plate 20 and the magnetic guiding column 30 can be increased, and the second magnetic plate 20 and the magnetic guiding column 30 can be fixedly connected.

With reference to fig. 3, in yet another embodiment, the first magnetic plate 10, the magnetic guiding column 30 and the second magnetic plate 20 are independently disposed, and two ends of the magnetic guiding column 30 are respectively bonded and fixed to the first magnetic plate 10 and the second magnetic plate 20 through a magnetic adhesive layer 40, so that magnetic induction between the first magnetic plate 10 and the second magnetic plate 20 and the magnetic guiding column 30 can be increased, and the first magnetic plate 10 and the second magnetic plate 20 can be fixedly connected to the magnetic guiding column 30.

The material of the magnetic adhesive layer 40 may be a mixture of at least one of epoxy resin, polyurethane, and silicone resin, and magnetic material powder, where the epoxy resin, the polyurethane, and the silicone resin are used to ensure the viscosity of the magnetic adhesive layer 40, and the magnetic material powder is used to improve the magnetism of the magnetic adhesive layer 40. The magnetic material powder may be one or more of ferrite powder, metal soft magnetic powder, and amorphous powder, and is not particularly limited herein.

Referring to fig. 8, fig. 8 is a schematic cross-sectional view of an embodiment of the transformer shown in fig. 3. The transformer 100 may further include a magnetic protection layer 50, the magnetic protection layer 50 has an accommodating cavity 51, and the first magnetic plate 10, the second magnetic plate 20 and the magnetic ring are accommodated in the accommodating cavity 51 and respectively attached to the inner wall of the accommodating cavity 51, so as to isolate and wrap the first magnetic plate 10, the second magnetic plate 20 and the magnetic conductive column 30, thereby reducing magnetic leakage and electromagnetic interference of the transformer 100.

Optionally, the material of the magnetic protection layer 50 is a mixture of plastic and magnetic material powder, the plastic is used to ensure the plasticity of the magnetic protection layer 50, so that the magnetic protection layer 50 can be attached to the surfaces of the first magnetic plate 10, the magnetic conductive columns 30 and the second magnetic plate 20, and the magnetic material powder is used to improve the magnetism of the magnetic adhesive layer 40. Wherein the magnetic protective layer 50 may have a saturation magnetic flux density of 0.7T and a magnetic permeability of 10-50.

Table 2: schematic diagrams comparing the prior art with the three examples of the present application.

As can be seen from table 2, when the inductance is not changed, the total thickness of the transformer 100 can be significantly reduced by using a material having a saturation magnetic flux density greater than that of the magnetic guide pillar 30, specifically, one or more of a FeNi metal powder core, a FeSiAl metal powder core, and a FeSCr metal powder core as the material of at least one of the first magnetic plate 10 and the second magnetic plate 20.

Referring to fig. 9 to 11, fig. 9 is a schematic cross-sectional view of a transformer according to an embodiment of the present application, fig. 10 is a schematic cross-sectional view along a direction C-C shown in fig. 9, and fig. 11 is a schematic cross-sectional view along a direction D-D shown in fig. 9.

In another embodiment, the magnetic conductive columns 30 may include a first magnetic column 34 and a second magnetic column 35 arranged at a gap, one end of the first magnetic column 34 and one end of the second magnetic column 35 may be connected to the first magnetic plate 10 in an abutting manner, and one end of the first magnetic column 34 and one end of the second magnetic column 35 may be connected to the second magnetic plate 20 in an abutting manner. The first magnetic plate 10, the first magnetic column 34, the second magnetic plate 20, and the second magnetic column 35 enclose a third closed magnetic circuit 303. Assuming that the cross-sectional area of the first magnetic pillar 34 (i.e., the cross-sectional area parallel to the first magnetic plate 10) is Q1, and the cross-sectional area of the second magnetic pillar 35 is Q2, if the magnetic flux of the first magnetic pillar 34 is equal to the magnetic flux of the second magnetic pillar 35, Q1 is equal to Q2. Assuming that the area of the longitudinal section of the first magnetic plate 10 (i.e., the section along the longitudinal direction of the first magnetic pillar 34) is D1, and the area of the longitudinal section of the second magnetic plate 20 is D2, D1 is D2 is Q1 is Q2, and Φ is BS, the magnetic fluxes of the first magnetic pillar 34 and the second magnetic pillar 35 are respectively equal to the magnetic flux of the first magnetic plate 10 and the magnetic flux of the second magnetic plate 20, that is, when the magnetic fluxes are not changed, the saturation magnetic flux density of the first magnetic plate 10 and/or the second magnetic plate 20 is increased, and the longitudinal section area D1 of the first magnetic plate 10 and/or the longitudinal section area D2 of the second magnetic plate 20 is decreased, so as to reduce the thickness of the first magnetic plate 10 and/or the second magnetic plate 20 and to reduce the size of the transformer 100.

Referring to fig. 12, fig. 12 is a schematic cross-sectional view of a variation of the transformer shown in fig. 9. Alternatively, the magnetic conductive columns 30 (the first magnetic columns 34 and the second magnetic columns 35) and the first magnetic plate 10 may be made of soft magnetic metal powder core and integrally formed, and the second magnetic plate 20 is made of ferrite magnetic material. In this case, the transformer 100 is a UI-type magnetic transformer 100, and the transformer 100 can be designed to have a simple structure and better reliability while reducing the size of the transformer 100.

Referring to fig. 13, fig. 13 is a schematic cross-sectional view of another variation of the transformer shown in fig. 9. Optionally, the magnetic conductive columns 30 and the second magnetic plate 20 are made of soft magnetic metal powder and are integrally formed, and the first magnetic plate 10 is made of a ferrite magnetic material. In this case, the transformer 100 is a UI-type magnetic transformer 100, and the transformer 100 can be designed to have a simple structure and better reliability while reducing the size of the transformer 100.

With reference to fig. 9, optionally, the first magnetic plate 10 and the second magnetic plate 20 are made of soft magnetic metal powder cores, and the magnetic conductive columns 30 are made of ferrite magnetic materials. By such design, the thickness of the transformer 100 can be sufficiently reduced, and the size of the transformer 100 can be reduced.

In the transformer 100 provided in the embodiment of the present application, the saturation magnetic flux density of at least one of the first magnetic plate 10 and the second magnetic plate 20 is greater than the saturation magnetic flux density of the magnetic guide pillar 30, so as to reduce the longitudinal cross-sectional area of the first magnetic plate 10 and/or the second magnetic plate 20, thereby achieving the purpose of reducing the thickness of the first magnetic plate 10 and/or the second magnetic plate 20 and reducing the size of the transformer 100.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.