Transformers, power adapters and electronic equipment components

Abstract

The present application discloses a transformer, a power adapter and an electronic device component, wherein the transformer is provided with a magnetic device, wherein the magnetic device comprises a plurality of magnetic sheets and an adhesive layer bonded between two adjacent magnetic sheets, wherein the plane of the magnetic sheet bonded to the adhesive layer is parallel to the magnetic circuit plane of the magnetic sheet, and the adhesive layer is a non-magnetic layer. The transformer is provided with a magnetic device, wherein the magnetic device comprises a plurality of magnetic sheets and an adhesive layer bonded between two adjacent magnetic sheets, wherein the plane of the magnetic sheet bonded to the adhesive layer is parallel to the magnetic circuit plane of the magnetic sheet, thereby ensuring the magnetic permeability of the magnetic device, reducing the loss and improving the use performance.

Description

Technical Field

[0001] The application relates to the field of communication equipment, and in particular to a transformer, a power adapter and an electronic equipment component. Background Art

[0002] At present, the magnetic core of the transformer cannot have the characteristics of high magnetic permeability and low loss at the same time. As a result, when the magnetic permeability of the core is high, although the magnetic induction performance is very strong, the loss is high, the core is easy to heat up, and energy is wasted, resulting in poor performance of the transformer. Summary of the invention

[0003] Embodiments of the present application provide a transformer, a power adapter, and an electronic equipment component.

[0004] An embodiment of the present application provides a transformer, wherein the transformer is provided with a magnetic device, the magnetic device comprising a plurality of magnetic sheets and an adhesive layer bonded between two adjacent magnetic sheets, the plane of the magnetic sheets bonded to the adhesive layer is parallel to the magnetic circuit plane of the magnetic sheets, and the adhesive layer is a non-magnetic layer.

[0005] An embodiment of the present application provides a power adapter, wherein the power adapter includes the above-mentioned transformer, and the power adapter also includes a circuit board, a control circuit and a current output device arranged on the circuit board, the circuit board is electrically connected to the input coil to control the current input to the input coil, the output coil is electrically connected to the current output device, and the current output device is used to output current to an external device.

[0006] An embodiment of the present application provides an electronic device assembly, wherein the electronic device assembly includes the above-mentioned power adapter, and the electronic device assembly also includes an electronic device, and the electronic device is electrically connected to the current output device.

[0007] The transformer, power adapter and electronic device assembly provided in the embodiments of the present application are provided with a magnetic device through the transformer, and the magnetic device includes a plurality of magnetic sheets and an adhesive layer bonded between two adjacent magnetic sheets, and the plane of the magnetic sheet bonded to the adhesive layer is parallel to the magnetic circuit plane of the magnetic sheet, thereby ensuring the magnetic permeability of the magnetic device, reducing losses and improving performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the application, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0009] Figure 1is a schematic diagram of a magnetic device of a transformer provided in an embodiment of the present application;

[0010] Figure 2 is a schematic diagram of a magnetic sheet of a magnetic device of a transformer provided in an embodiment of the present application;

[0011] Figure 3 is a test data chart of the magnetic device of the transformer provided in the embodiment of the present application;

[0012] Figure 4 is a schematic diagram of a magnetic sheet of a magnetic device of a transformer provided in an embodiment of the present application;

[0013] Figure 5 is a schematic diagram of a magnetic device of a transformer provided in another embodiment of the present application;

[0014] Figure 6 is a schematic diagram of a transformer provided in an embodiment of the present application;

[0015] Figure 7 is another schematic diagram of a transformer provided in an embodiment of the present application;

[0016] Figure 8 is a schematic diagram of a power adapter provided in an embodiment of the present application;

[0017] Fig. 9 It is a schematic diagram of an electronic device component provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the implementation modes of the application will be described clearly and completely below in conjunction with the drawings in the implementation modes of the application.

[0019] See also Figure 1 and Figure 2 The present application provides a transformer 100, the transformer 100 is provided with a magnetic device 10, the magnetic device 10 includes a plurality of magnetic sheets 11 and an adhesive layer 12 bonded between two adjacent magnetic sheets 11. The plane of the magnetic sheet 11 bonded to the adhesive layer 12 is parallel to the magnetic circuit plane of the magnetic sheet 11. At least one of the magnetic sheets 11 in the magnetic device 10 is provided with a main connecting column 111, two end columns 112 and a middle column 113. The two end columns 112 are arranged at both ends of the main connecting column 111 and are located on the same side of the main connecting column 111. The middle column 113 is arranged between the two ends of the main connecting column 111, the middle column 113 is located between the two end columns 112, and the adhesive layer 12 is a non-magnetic layer.

[0020] It is understandable that the transformer 100 can be applied to the power adapter 200 to convert strong electricity into weak electricity and transmit the weak electricity to the electronic device. The electronic device can be a mobile phone, a laptop computer, a tablet computer, a smart watch, a smart wearable device, etc.

[0021] The transformer 100 is provided with a magnetic device 10, which includes a plurality of magnetic sheets 11 and an adhesive layer 12 bonded between two adjacent magnetic sheets 11. The plane of the magnetic sheet 11 bonded to the adhesive layer 12 is parallel to the magnetic circuit plane of the magnetic sheet 11, thereby ensuring the magnetic permeability of the magnetic device 10, reducing the loss and improving the performance.

[0022] In this embodiment, a plurality of the magnetic sheets 11 are stacked in the thickness direction. The plane on which the magnetic sheet 11 is bonded to the adhesive layer 12 is a flat surface. The main connecting column 111 is in the shape of a rectangular plate. The two end columns 112 are arranged on the same side of the main connecting column 111. The middle column 113 is equidistant from the two end columns 112. The widths of the plurality of main connecting columns 111 are consistent, the widths of the end columns 112 of two adjacent magnetic sheets 11 are inconsistent, and the widths of the middle columns 113 of two adjacent magnetic sheets 11 are inconsistent. After the plurality of magnetic sheets 11 are stacked, arc grooves are formed between the plurality of end columns 112 and the plurality of middle columns 113. The plurality of middle columns 113 form a cylinder. The magnetic sheet 11 is an E-shaped sheet, so that the space utilization rate of the magnetic sheet 11 is high. Of course, in other embodiments, the other magnetic sheets 11 in the magnetic device 10 can also be U-shaped sheets.

[0023] In this embodiment, the bonding layer 12 is an adhesive layer. During the bonding process of the magnetic sheets 11, the bonding layer 12 is squeezed by two adjacent magnetic sheets 11, so that the bonding layer 12 and the two adjacent magnetic sheets 11 are firmly bonded, and the solidification stress of the bonding layer 12 is prevented from being transferred to the magnetic sheets 11, and the magnetic sheets 11 are prevented from being subjected to additional stress, thereby ensuring that the magnetic permeability of the magnetic device 10 is not easy to decrease, and the hysteresis loss is reduced. The bonding layer 12 is a non-magnetic material. The bonding layer 12 can be directly bonded to the adjacent magnetic sheets 11, or it can be indirectly bonded to the magnetic sheets 11 through other layer structures.

[0024] It is understandable that in the prior art, the non-magnetic material is disposed in two adjacent stacked magnetic sheets 11 by an integrated molding method, so that the multi-layer magnetic sheets 11 are stacked to form a stable magnetic core. However, under this structure, the non-magnetic material has condensation deformation stress during the condensation process, which causes the magnetic sheet 11 to bear additional stress, resulting in a decrease in the magnetic permeability of the magnetic sheet 11, and a significant increase in the hysteresis loss of the magnetic sheet 11, thereby causing the performance of the magnetic core to be poor. The magnetic device 10 of the present application is bonded to two adjacent magnetic sheets 11 by an adhesive layer 12. During the bonding process between the adhesive layer 12 and the magnetic sheet 11, the magnetic sheet 11 does not need to bear additional stress, so that the magnetic permeability of the magnetic device 10 is not easy to decrease, and the hysteresis loss will not be prompted, thereby improving the performance.

[0025] Since the adhesive layer 12 has an insulating effect, the adhesive layer 12 cuts the magnetic device 10 into several sections, and the two adjacent magnetic sheets 11 are isolated from each other, and the overall resistivity of the magnetic device 10 is improved, so that the eddy current loss is significantly reduced. In addition, by reducing the size of the magnetic sheet 11 into a smaller sheet structure, it is beneficial to improve the uniformity of the magnetic sheet 11 during the sintering process, improve the sintering density of the magnetic sheet 11, and help reduce hysteresis loss. That is, the magnetic device 10 uses the adhesive layer 12 to bond two adjacent magnetic sheets 11, and the plane of the magnetic sheet 11 bonded to the adhesive layer 12 is parallel to the magnetic circuit plane of the magnetic sheet 11, so that the eddy current loss of the transformer 100 is reduced at an operating frequency greater than 100kHz, and the heat generation of the transformer 100 is reduced, thereby improving the efficiency of the transformer 100.

[0026] Since the elastic modulus of the adhesive layer 12 is relatively low, when the transformer 100 falls, the adhesive layer 12 will be deformed first to alleviate the impact of the external impact on the body of the magnetic device 10 , so that the transformer 100 can improve its ability to resist external stress.

[0027] The high-frequency loss test is performed on a magnetic device 10 formed by splicing two magnetic sheets 11 of the same material and size through an adhesive layer 12, and a magnetic device 10 of the same size and material (the size is the same as the spliced ​​two magnetic sheets 11). The test results are shown in Figure 1. Figure 3 As shown, A1 and A2 are numbers of two complete magnetic devices 10, and B1 and B2 are numbers of the magnetic device 10 formed by splicing two magnetic sheets 11. It can be seen that the unit volume loss of the spliced ​​magnetic device 10 is significantly smaller than the loss of the complete magnetic device 10. The above test results show that the magnetic device 10 with a stacked magnetic sheet 11 structure can effectively reduce the high-frequency loss of the magnetic core.

[0028] For further information, see Figure 4One of the end columns 112 is a magnetic field input end, which inputs a magnetic field and transmits the magnetic field to an adjacent middle column 113 via the main connecting column 111; the middle column 113 is a magnetic field output input end, the middle column 113 outputs the magnetic field input by one of the end columns 112, and inputs the magnetic field to the main connecting column 111, so as to transmit the input magnetic field to another adjacent end column 112 via the main connecting column 111; the other end column 112 is a magnetic field output end, so as to output the magnetic field introduced by the middle column 113.

[0029] In this embodiment, the main connecting column 111 has two magnetic conduction parts 114. Each magnetic conduction part 114 is located between the end column 112 and the middle column 113. One of the magnetic conduction parts 114 conducts the magnetic field from the adjacent end column 112 to the adjacent middle column 113, and the other magnetic conduction part 114 conducts the magnetic field from the adjacent middle column 113 to the adjacent end column 112. The end column 112, the magnetic conduction part 114 and the middle column 113 can form a part of the magnetic circuit. Each of the magnetic sheets 11 can be located in two magnetic circuits, so that the space utilization rate of the magnetic device 10 is high. The magnetic circuit plane of each of the magnetic sheets 11 is parallel to the plane where the magnetic sheets 11 are stacked with the magnetic sheets 11, which avoids the setting of air gaps in the direction of the magnetic circuit, ensures the magnetic permeability, and reduces eddy current losses.

[0030] In this embodiment, if Figure 1 As shown, the thickness of the adhesive layer 12 is less than the thickness of the magnetic sheet 11, so that the overall volume of the magnetic device 10 is effectively reduced, and the adhesive layer 12 increases the resistivity of the magnetic device 10 and reduces the eddy current loss of the magnetic device 10. Of course, in other embodiments, the thickness of the adhesive layer 12 may also be equal to the thickness of the magnetic sheet 11.

[0031] In one embodiment, the magnetic sheets 11 of the magnetic device 10 are made of the same magnetic material composition. The material of the magnetic sheets 11 is any combination of amorphous, nanocrystalline, MnZn ferrite, NiZn ferrite, iron powder core and other materials. The magnetic device 10 of the present application does not limit the number of magnetic sheets 11. This embodiment takes the magnetic device 10 as an example to set 8 magnetic sheets 11. The 8 magnetic sheets 11 are firmly bonded by the bonding layer 12.

[0032] In another embodiment, the magnetic sheets 11 of the magnetic device 10 are made of different magnetic material components. Some of the magnetic sheets 11 are made of any combination of amorphous, nanocrystalline, MnZn ferrite, NiZn ferrite, iron powder core and other materials, and other magnetic sheets 11 are made of any combination of amorphous, nanocrystalline, MnZn ferrite, NiZn ferrite, iron powder core and other materials, but their combination is different from the magnetic material combination of the previous magnetic sheet 11. The magnetic device 10 of the present application does not limit the magnetic material combination of the magnetic sheets 11. The present application uses the example of the magnetic device 10 having two different magnetic material combinations. The magnetic sheets 11 of the two different magnetic material combinations are arranged in an alternating manner. The magnetic device 10 of the present application does not limit the number of magnetic sheets 11. The present embodiment uses the example of the magnetic device 10 having 8 magnetic sheets 11. The 8 magnetic sheets 11 are firmly bonded to each other via the adhesive layer 12.

[0033] It is understandable that for the magnetic device 10 with the magnetic sheets 11 stacked in a composite combination of two different magnetic materials, on the basis of the beneficial effects of the magnetic device 10 with the magnetic sheets 11 stacked in the above-mentioned single material, different magnetic materials can be selected for combination to achieve comprehensive optimization and improvement of the magnetic properties of the magnetic device 10, ensuring that the performance of the magnetic device 10 in different working scenarios is flexible and adjustable. For example, it is usually difficult to have both high magnetic permeability and low loss for magnetic materials. The magnetic device 10 of the present application can simultaneously select a magnetic sheet 11 with a high magnetic permeability material and a magnetic sheet 11 with a low loss material for combination, so that the magnetic device 10 can achieve the effects of high magnetic permeability and low loss at the same time. Similarly, it is also difficult to have both high magnetic permeability and high saturation magnetic induction intensity at the same time. The present application can combine a magnetic sheet 11 with a high magnetic permeability material and a magnetic sheet 11 with a high saturation magnetic induction intensity material, so that the magnetic device 10 as a whole obtains the effects of high magnetic permeability and high magnetic induction intensity, so that the magnetic device 10 is not prone to magnetic saturation when operating under high inductance conditions.

[0034] It can be understood that the magnetic device 10 of the present application can also be a stack of magnetic sheets 11 of different shapes, for example, a U-shaped magnetic sheet 11 and an E-shaped magnetic sheet 11 are stacked, the U-shaped magnetic sheet 11 is located at both ends of the magnetic device 10, and the E-shaped magnetic sheet 11 is located in the middle of the magnetic device 10, so that a central column structure is set in the middle of the magnetic device 10.

[0035] For further information, see Figure 5 In another embodiment, which is substantially the same as the illustrated embodiment, the difference is that the magnetic device 10 further includes a heat conductive sheet 13 stacked between two adjacent magnetic sheets 11 , and the heat conductive sheet 13 is bonded to the magnetic sheets 11 via the bonding layer 12 .

[0036] The structure of the heat conductive sheet 13 is substantially the same as that of the magnetic sheet 11. The edge of the heat conductive sheet 13 is aligned with the edge of the adjacent magnetic sheet 11, so that the overall volume of the magnetic device 10 is effectively reduced. The heat conductive sheet 13 is bonded to the adhesive layer 12, and the adhesive layer 12 is bonded to the magnetic sheet 11, that is, two layers of the adhesive layer 12 are arranged between two adjacent magnetic sheets 11, and one layer of the heat conductive sheet 13 is arranged between the two layers of the adhesive layer 12. The heat conductive sheet 13 is made of a non-ferromagnetic material with a high resistivity and a higher thermal conductivity than the magnetic core. The material of the heat conductive sheet 13 can be Al2O3 or AlN. The heat conductive sheet 13 can effectively dissipate the heat of the magnetic sheet 11, reduce the overall temperature of the magnetic device 10, and extend the service life of the magnetic device 10. The heat conductive sheet 13 can also be made of a material with a high resistivity to further reduce the eddy current loss of the magnetic device 10. The magnetic material composition of the two adjacent magnetic sheets 11 can be different to increase the performance of the magnetic device 10.

[0037] For further information, see Figure 6 and Figure 7 The transformer 100 is further provided with an input coil 20 and an output coil 30 . The input coil 20 and the output coil 30 are wound around the magnetic device 10 . The input coil 20 is used to receive input current, and the output coil 30 is used to output current.

[0038] In this embodiment, the transformer 100 is provided with two magnetic devices 10, and the two magnetic devices 10 are stacked on each other, and the stacking direction of the two magnetic devices 10 is perpendicular to the magnetic circuit plane of each magnetic sheet 11. One of the magnetic devices 10 is an E-type magnetic core, and the other magnetic device 10 is an I-type magnetic core. After the two magnetic devices 10 are stacked, the magnetic sheets 11 of the two magnetic devices 10 are located in two complete magnetic circuits. Of course, in other embodiments, the transformer 100 can also be a stack of two E-type magnetic devices 10.

[0039] In this embodiment, the input coil 20 and the output coil 30 are both wound on the E-shaped magnetic device 10. The input coil 20 and the output coil 30 are respectively wound on two magnetic guides 114. The input coil 20 is used to receive current so that a magnetic field is obtained on the magnetic device 10, and the output coil 30 obtains an induced current according to the magnetic field and outputs the current to an external device. The input coil 20 has a plurality of turns of input winding wound on the magnetic guide 114, and the output coil 30 has a plurality of turns of output winding wound on another magnetic guide 114. The arrangement direction of two adjacent turns of input winding is parallel to the magnetic circuit plane of the magnetic sheet 11, and the arrangement direction of two adjacent turns of output winding is parallel to the magnetic circuit plane of the magnetic sheet 11.

[0040] The input coil 20 also has an input end 21 located on one side of the magnetic device 10, and the output coil 30 has an output end 31 located on the other side of the magnetic device 10. The transformer 100 also includes an input substrate 40 and an output substrate 50. The input substrate 40 is fixed to one side of the magnetic device 10, and the output substrate 50 is fixed to a side of the magnetic device 10 away from the input substrate 40. The input end 21 is fixed to the input substrate 40, and the output end 31 is fixed to the output substrate 50. The input end 21 is used to receive strong alternating current, and the output end 31 is used to output weak direct current.

[0041] Of course, in other embodiments, the input coil 20 and the output coil 30 may also be respectively wound on two magnetic devices 10, for example, the input coil 20 is wound on an E-type magnetic device 10, and the output coil 30 is wound on an I-type magnetic device 10. The input coil 20 and the output coil 30 may also be respectively wound on the terminal posts 112 at both ends of the magnetic device 10.

[0042] In order to prevent the two magnetic devices 10 from colliding with each other, the transformer 100 further includes an elastic gasket 60 disposed between the two magnetic devices 10 and pressed together. The elastic gasket 60 is sleeved on the middle column of one of the magnetic devices 10 and is located in the arc groove. Of course, in other embodiments, a buffer pad or a buffer rubber layer may be disposed between the two magnetic devices 10.

[0043] See also Figure 8 The present application also provides a power adapter 200, which includes the transformer 100, and further includes a circuit board 210, a control circuit and a current output device 220 arranged on the circuit board 210, wherein the circuit board 210 is electrically connected to the input end 21 of the input coil 20 to control the current input to the input coil 20, and the output coil 30 is electrically connected to the current output device 220 via the output end 31, and the current output device 220 is used to output current to an external device.

[0044] Specifically, the power adapter 200 also includes a housing 230 and a pin installed on the housing 230. The transformer 100, the circuit board 210 and the current output device 220 are accommodated in the housing 230, and the housing 230 protects the transformer 100, the circuit board 210 and the current output device 220. The pin is connected to the circuit board 210 via a conductive cable, so as to be plugged into a mains socket and conduct the mains to the circuit board 210. The control circuit on the circuit board 210 processes the mains and transmits the mains to the transformer 100, and the transformer 100 converts the mains into direct current and conducts the direct current to the current output device 220. The current output device 220 can be a USB (Universal Serial Bus) connector. The current output device 220 can be electrically connected to an external electronic device via a wire to output direct current to the electronic device.

[0045] It is understandable that the power adapter 200 can obtain electrical energy by plugging the power adapter 200 into a power socket, thereby conveniently transferring electrical energy to electronic devices such as mobile phones, smart watches, laptops, tablet computers, smart headphones, etc. The plug of the power adapter 200 can be a plug of various standards such as national standards, European standards, American standards, British standards, Australian standards, Japanese standards, or Korean standards.

[0046] See also Fig. 9 The present application also provides an electronic device assembly 300, wherein the electronic device assembly 300 includes the power adapter 200, and the electronic device assembly 300 also includes an electronic device 310, and the electronic device 310 is electrically connected to the current output device 220. The power adapter 200 is used to charge the electronic device 310 when the pin is plugged into the power socket. It can be understood that the electronic device 310 can be a mobile phone, a smart watch, a laptop computer, a tablet computer, a smart headset and other devices. The electronic device 310 is provided with a power port 311. The power adapter 200 is provided with a current output device 220 electrically connected to the power port 311, and the current output device 220 can be connected to the power port 311 by wire or wirelessly.

[0047] Optionally, the electronic device 310 is a mobile phone, and the power port 311 is disposed at the bottom of the electronic device 310. The current output device 220 and the power port 311 are connected via a conductive cable.

[0048] The transformer 100 is provided with a magnetic device 10, and the magnetic device 10 includes a plurality of magnetic sheets 11 and an adhesive layer 12 bonded between two adjacent magnetic sheets 11. The plane of the magnetic sheet 11 bonded to the adhesive layer 12 is parallel to the magnetic circuit plane of the magnetic sheet 11, thereby ensuring the magnetic permeability of the magnetic device 10, reducing the loss, and improving the performance. The magnetic device 10 can select magnetic sheets 11 of different materials to achieve different magnetic properties. The magnetic device 10 effectively reduces the eddy current loss of the transformer 100 by superimposing the magnetic sheets 11 on the magnetic sheets 11; by bonding the adhesive layer 12 between two adjacent magnetic sheets 11, the anti-drop and anti-external stress capabilities of the transformer 100 can be improved; by adjusting the material of the magnetic sheet 11, the magnetic permeability of the transformer 100 is effectively guaranteed, and the DC superposition characteristics and losses of the transformer 100 are flexibly regulated to meet more complex application scenarios.

[0049] The above is a preferred implementation of the application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the application. These improvements and modifications are also considered to be within the scope of protection of the application.

Claims

1. A transformer, characterized in that: The transformer is provided with a magnetic device, which includes a plurality of magnetic sheets and an adhesive layer bonded between two adjacent magnetic sheets, the plane of the magnetic sheets bonded to the adhesive layer is parallel to the magnetic circuit plane of the magnetic sheets, and the adhesive layer is a non-magnetic layer; the magnetic sheets are provided with a main connecting column, two end columns and a middle column, the main connecting column has two magnetic conduction parts, each of the magnetic conduction parts is located between the end column and the middle column, and the transformer is also provided with an input coil and an output coil, and the input coil and the output coil are respectively arranged around the two magnetic conduction parts.

2. The transformer according to claim 1, characterized in that: The magnetic device further comprises a heat conducting sheet stacked between two adjacent magnetic sheets, and the heat conducting sheet is bonded to the magnetic sheets via the bonding layer.

3. The transformer according to claim 2, characterized in that: The edge of the heat conductive sheet is aligned with the edge of the adjacent magnetic sheet.

4. The transformer according to claim 1, characterized in that: The two end columns are arranged at the two ends of the main connecting column and are located on the same side of the main connecting column. The middle column is arranged between the two ends of the main connecting column, and the middle column is located between the two end columns.

5. The transformer according to claim 4, characterized in that: One of the end posts is a magnetic field input end, which inputs a magnetic field and conducts the magnetic field to an adjacent middle post via the main connecting post; the middle post is a magnetic field output input end, which outputs the magnetic field input by one of the end posts and inputs the magnetic field to the main connecting post, which conducts the input magnetic field to another adjacent end post via the main connecting post; the other end post is a magnetic field output end, which outputs the magnetic field introduced by the middle post.

6. The transformer according to claim 1, characterized in that: The thickness of the adhesive layer is smaller than the thickness of the magnetic sheet.

7. The transformer according to claim 1, characterized in that: Two adjacent magnetic sheets are provided with the same or different magnetic material components.

8. The transformer according to claim 7, characterized in that: The magnetic device is provided with two groups of magnetic sheets with different magnetic material components, and the two groups of magnetic sheets are arranged in a staggered manner.

9. The transformer according to claim 1, characterized in that: Two adjacent magnetic sheets are isolated from each other.

10. The transformer according to claim 1, characterized in that: The input coil and the output coil are wound around the magnetic device. The input coil is used to receive input current, and the output coil is used to output current.

11. The transformer according to claim 10, characterized in that: The input coil has multiple turns of input windings, and the output coil has multiple turns of output windings. The arrangement direction of two adjacent turns of input windings is parallel to the magnetic circuit plane of the magnetic sheet, and the arrangement direction of two adjacent turns of output windings is parallel to the magnetic circuit plane of the magnetic sheet.

12. The transformer according to claim 10, characterized in that: The number of the magnetic devices is two, the two magnetic devices are stacked on each other, and the stacking direction of the two magnetic devices is perpendicular to the magnetic circuit plane of each magnetic sheet.

13. The transformer according to claim 11, characterized in that: The input coil and the output coil are wound around the same magnetic device or are respectively wound around two magnetic devices.

14. A power adapter, characterized in that: The power adapter includes the transformer according to any one of claims 1 to 13, and the power adapter also includes a circuit board, a control circuit and a current output device arranged on the circuit board, the circuit board is electrically connected to the input coil to control the current input to the input coil, the output coil is electrically connected to the current output device, and the current output device is used to output current to an external device.

15. An electronic device assembly, characterized in that: The electronic device assembly includes the power adapter according to claim 14, and the electronic device assembly also includes an electronic device, and the electronic device is electrically connected to the current output device.

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