Integrated magnetic element and switching power supply

Abstract

The utility model discloses an integrated magnetic element and a switching power supply, the integrated magnetic element comprises a first circuit board, a second circuit board and a magnet, and the first circuit board comprises a primary winding circuit and a secondary winding circuit; the second circuit board comprises a PFC circuit, and the second circuit board and the first circuit board are arranged side by side; the magnet comprises a first cavity used for containing the first circuit board and a second cavity used for containing the second circuit board, the magnet further comprises a partition wall, and the partition wall is arranged between the first cavity and the second cavity so as to separate the first cavity from the second cavity. According to the invention, the transformer and the PFC inductor are integrated into one planar magnetic element, and the size of the magnetic element is reduced, so that the internal structure of the switching power supply is more compact, and the power density is improved.

Description

Technical Field

[0001] This application relates to the technical field of switching power supplies, and particularly to an integrated magnetic component and a switching power supply. Background Art

[0002] Currently, switching power supplies dominate the power supply field with their high efficiency and high power density. With the development trend of miniaturization of electronic devices, switching power supplies are also gradually developing towards miniaturization and high power density. As an important component in switching power supplies, magnetic components are the main factors affecting the volume and weight of switching power supplies. Their design and optimization are of great significance for improving the power density and optimizing the structure of switching power supplies.

[0003] The magnetic components in a switching power supply include a transformer, which is used to achieve voltage conversion and electrical isolation. As the output power increases, a PFC inductor needs to be set in the switching power supply to reduce harmonics. In related technologies, the transformer and the PFC inductor use two separate devices, each requiring an independent installation space, resulting in a large overall space occupied by the magnetic components, making it difficult to meet the product development requirements of a compact structure and being unfavorable for improving the power density. Therefore, it is necessary to develop a magnetic component structure to meet the development requirements of a compact switching power supply. Summary of the Utility Model

[0004] The embodiments of this application provide an integrated magnetic component and a switching power supply, which can solve the problem that the magnetic component structure in related technologies is difficult to be applied to a compact switching power supply.

[0005] In a first aspect, the embodiments of this application provide an integrated magnetic component, which includes a first circuit board, a second circuit board, and a magnet. The first circuit board includes a primary winding circuit and a secondary winding circuit; the second circuit board includes a PFC circuit and is arranged side by side with the first circuit board; the magnet includes a first cavity for accommodating the first circuit board and a second cavity for accommodating the second circuit board. The magnet further includes a partition wall, which is arranged between the first cavity and the second cavity to separate the first cavity from the second cavity.

[0006] In a second aspect, the embodiments of this application provide a switching power supply, which includes the above-mentioned integrated magnetic component.

[0007] An integrated magnetic component and a switching power supply according to an embodiment of the present application. The first circuit board and the second circuit board are arranged side by side on the magnet. The first circuit board includes a primary winding circuit and a secondary winding circuit, and is configured as a transformer together with the magnet. The second circuit board includes a PFC circuit and is configured as a PFC inductor together with the magnet. In this way, the transformer and the PFC inductor are integrated into a planar magnetic component to reduce the space occupied by the transformer and the PFC inductor, reduce the overall volume of the magnetic component in the switching power supply, make the internal structure of the switching power supply more compact, and help improve the power density. In the embodiment of the present application, the transformer and the PFC inductor are arranged on two circuit boards respectively. The magnet has a partition wall so that the two circuit boards are in separate spaces, which is convenient for maintenance and separate replacement. In addition, the partition wall provides a common magnetic path with low magnetic resistance, so that the magnetic flux generated by the transformer and the magnetic flux generated by the PFC inductor form a loop through the partition wall. The partition wall equivalently increases the effective magnetic permeability area of the magnet, making the magnetic flux closing path more, and the magnetic flux distribution in the magnet more uniform, thereby reducing the peak magnetic flux density in the magnet and helping to reduce the working heat generation of the integrated magnetic component. The present application adopts decoupled integration so that the integrated magnetic component can replace the original two discrete magnetic components and has little impact on the circuit performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0009] Figure 1 Schematic perspective view of an integrated magnetic component according to an embodiment of the present application;

[0010] Figure 2 Schematic perspective exploded view of an integrated magnetic component according to an embodiment of the present application;

[0011] Figure 3 Schematic cross-sectional view of a magnet according to an embodiment of the present application;

[0012] Figure 4 Another schematic perspective view of an integrated magnetic component according to an embodiment of the present application;

[0013] Figure 5 Another schematic perspective exploded view of an integrated magnetic component according to an embodiment of the present application;

[0014] Figure 6 Another schematic cross-sectional view of a magnet according to an embodiment of the present application;

[0015] Reference numerals:

[0016] 1. Integrated magnetic element; 10. First circuit board; 20. Second circuit board; 30. Magnet; 11. First pin; 21. Second pin; 31. First sub-magnet; 32. Second sub-magnet; 33. Third sub-magnet; 34. Fourth sub-magnet; 35. Fifth sub-magnet; 36. Magnetic core middle column; 310. First cavity; 320. Second cavity; 301. Spacer wall; 302. Sub-magnetic core middle column; 311. First magnetic transverse wall; 312. First magnetic side wall; 321. Second magnetic transverse wall; 331. Third magnetic transverse wall; 332. Third magnetic side wall; 341. Fourth magnetic transverse wall; 342. Fourth magnetic side wall; 343. First sub-spacer wall; 351. Fifth magnetic transverse wall; 352. Fifth magnetic side wall; 353. Second sub-spacer wall; A. First direction; B. Second direction. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] Switching power supplies dominate the power supply field due to their high efficiency and high power density. In a switching power supply, magnetic elements can perform multiple functions such as energy storage and conversion, filtering, and electrical isolation, but they also occupy most of the volume space. Generally, the volume of magnetic elements accounts for 20% - 30% of the total volume of the switching power supply, and the weight accounts for 30% - 40% of the total weight of the switching power supply. Therefore, to improve the power density, output quality, and efficiency of the switching power supply, targeted magnetic element design is required to reduce the volume and losses of the magnetic elements.

[0019] The inventors found that in a switching power supply, two separate devices are generally used to implement the PFC (Power Factor Correction) inductor and the transformer. The PFC inductor coil and the transformer are both set separately and each requires an independent installation space, resulting in a relatively large overall space occupied by the magnetic elements in the switching power supply. Based on this, an integrated magnetic element and a switching power supply are proposed in the embodiments of the present application.

[0020] As Figure 1 and Figure 2 shown, Figure 1 is a schematic three-dimensional structure diagram of an integrated magnetic element 1 according to an embodiment of the present application, Figure 2 is a schematic exploded three-dimensional structure diagram of an integrated magnetic element 1 according to an embodiment of the present application. The integrated magnetic element 1 includes a first circuit board 10, a second circuit board 20, and a magnet 30, and the magnet 30 has magnetism.

[0021] The first circuit board 10 has multiple layers of circuits, including a primary winding circuit and a secondary winding circuit, and the first circuit board 10 is installed in the magnet 30. In the embodiment of the present application, the first circuit board 10 and the magnetic core 30 are jointly configured as a transformer: after the first circuit board 10 is connected to a current, the magnetic fields generated around the primary winding circuit and the secondary winding circuit interact with the magnetic field of the magnet 30, playing a role in voltage conversion and electrical isolation.

[0022] In the embodiment of the present application, the first circuit board 10 further includes an auxiliary circuit and an electromagnetic interference compensation circuit. Among them, the primary winding circuit, the auxiliary circuit, the electromagnetic interference compensation circuit, and the secondary winding circuit are stacked in sequence, and the first circuit board 10 is used to achieve circuit connection and power transfer and conversion.

[0023] The second circuit board 20 includes a PFC circuit, and the second circuit board 20 is installed in the magnet 30. In the embodiment of the present application, the second circuit board 20 and the magnet 30 are jointly configured as a PFC inductor: the PFC circuit includes a PFC inductor coil. After the second circuit board 20 is connected to a current, the magnetic field generated by the PFC inductor coil interacts with the magnetic field of the magnet 30 to improve the power factor of the switching power supply and reduce harmonics.

[0024] Compared with traditional winding coils, the printed circuit board has less noise, and the winding layer in the printed circuit board has a larger heat dissipation area, can withstand a larger current density, and its flat winding structure is beneficial to reducing eddy current losses at high frequencies. In the embodiment of the present application, the first circuit board 10 and the second circuit board 20 adopt printed circuit boards, and the first circuit board 10 and the second circuit board 20 are in their respective independent spaces within the magnet 30, which is convenient for maintenance. Once a failure occurs, it is easier to locate the specific printed circuit board, and it is also convenient to replace one of the printed circuit boards separately.

[0025] Please refer to Figures 1-3 , Figure 3A cross-sectional schematic view of a magnet 30 according to an embodiment of the present application. The magnet 30 has a first cavity 310 and a second cavity 320. The first cavity 310 is used to accommodate a first circuit board 10, and the second cavity 320 is used to accommodate a second circuit board 20. The first circuit board 10 and the second circuit board 20 are arranged side by side. The edges of the first circuit board 10 and the edges of the second circuit board 20 are correspondingly parallel, and the board surface of the first circuit board 10 and the board surface of the second circuit board 20 are parallel or coplanar. Among them, the first circuit board 10 and the second circuit board 20 are arranged at intervals along a preset direction, and the preset direction can be the first direction A or the second direction B. In this way, the transformer and the PFC inductor are integrated into a planar magnetic element, reducing the space occupied by the transformer and the PFC inductor, reducing the number and overall volume of magnetic elements in the switching power supply, so as to form a more compact product. In the embodiment of the present application, the integrated magnetic element 1 also shortens the wiring length between the transformer and the PFC inductor, and reduces the distributed parameters of the circuit.

[0026] The magnet 30 further includes a partition wall 301, and the partition wall 301 is disposed between the first cavity 310 and the second cavity 320. In the embodiment of the present application, the partition wall 301 is used to separate the first cavity 310 and the second cavity 320. The partition wall 301 provides a common magnetic path with low magnetic resistance. The magnetic flux generated by the transformer and the magnetic flux generated by the PFC inductor both form a magnetic circuit after passing through the partition wall 301, and the coupling between them is small. This decoupled integration method has little impact on the circuit performance. It can be understood that the partition wall 301 equivalently increases the effective magnetic conduction area of the magnet 30, making the magnetic flux closed path more, and the magnetic flux distribution in the magnet 30 more uniform, thereby reducing the peak magnetic flux density in the magnet 30, which helps to reduce the working heat generation of the integrated magnetic element 1.

[0027] In the embodiment of the present application, the first cavity 310 and the second cavity 320 penetrate the magnet 30 along the preset direction respectively, which helps to form a smooth air duct, so that the gas can enter the first cavity 310 and the second cavity 320 along the preset direction for heat dissipation. The structures of the first cavity 310 and the second cavity 320 facilitate the pins of the printed circuit board to extend out of the magnet 30, so that the first circuit board 10 and the second circuit board 20 can be electrically connected to the external circuit. Among them, the board surface of the first circuit board 10 is parallel to the board surface of the second circuit board 20, the preset direction is perpendicular to the arrangement direction of the first cavity 310 and the second cavity 320, and is parallel to the board surface of the first circuit board 10.

[0028] Specifically, the first circuit board 10 includes a first pin 11 that extends out of the magnet 30 from the first cavity 310 and is used for electrical connection with an external circuit, and the other parts of the first circuit board 10 are kept accommodated in the first cavity 310. The second circuit board 20 includes a second pin 21 that extends out of the magnet 30 from the second cavity 320 and is used for electrical connection with an external circuit, and the other parts of the second circuit board 20 are kept accommodated in the second cavity 320. In a preferred embodiment of the present application, the first pin 11 and the second pin 21 are led out from the same side of the magnet 30, which helps to reduce the wiring length, make the wiring of the external circuit more concise, reduce electromagnetic interference, and improve the performance and stability of the circuit.

[0029] In the embodiment of the present application, the magnet 30 further includes a plurality of sub-magnets that are stacked and connected along the first direction A and define the first cavity 310 and the second cavity 320, which is convenient for disassembly, installation and maintenance.

[0030] It should be noted that the first cavity 310 and the second cavity 320 can be arranged in different directions to adapt to different power supply structures. For example Figures 1-3 As shown, in some embodiments, the plurality of sub-magnets include a first sub-magnet 31, a second sub-magnet 32, and a third sub-magnet 33 to form the first cavity 310 and the second cavity 320 that are arranged at intervals along the first direction A. The structure of the magnet 30 can adapt to a power supply with a compact structure. As Figures 4-6 shown Figure 4 is a three-dimensional structure schematic diagram of another integrated magnetic element 1 according to an embodiment of the present application. Figure 5 is a three-dimensional exploded structure schematic diagram of another integrated magnetic element 1 according to an embodiment of the present application. Figure 6 is a cross-sectional schematic diagram of another magnet 30 according to an embodiment of the present application. In some other embodiments, the plurality of sub-magnets include a fourth sub-magnet 34 and a fifth sub-magnet 35 to form the first cavity 310 and the second cavity 320 that are arranged at intervals along the second direction B, where the second direction B is perpendicular to the first direction A. The structure of the magnet 30 can adapt to a power supply with a long and thin shape.

[0031] The magnet 30 further includes two magnetic core middle columns 36 with parallel axes. The magnetic core middle columns 36 and the other parts of the magnet 30 together form a magnetic circuit. One of the magnetic core middle columns 36 is arranged corresponding to the first cavity 310, and each winding and coil in the first circuit board 10 are sleeved on the periphery of the magnetic core middle column 36. The other magnetic core middle column 36 is arranged corresponding to the second cavity 320, and the PFC inductance coil in the second circuit board 20 is sleeved on the periphery of the magnetic core middle column 36. In the embodiment of the present application, at least one of the above-mentioned plurality of sub-magnets has a magnetic core middle column 36.

[0032] Furthermore, the sub-magnet has a sub-magnetic core middle column 302. The sub-magnetic core middle columns 302 of two adjacent sub-magnets are arranged oppositely to form a magnetic core middle column 36. The two sub-magnetic core middle columns 302 of the same magnetic core middle column 36 are coaxial and arranged at intervals. In this way, an air gap is formed between the two sub-magnetic core middle columns 302 of the same magnetic core middle column 36, so as to increase the energy storage capacity of the transformer, reduce eddy current loss, and improve the energy conversion efficiency. It should be noted that since there is no air gap in the spacer wall 301 and its magnetic resistance is much smaller than that of the magnetic core middle column 36, the magnetic flux generated by the transformer and the magnetic flux generated by the PFC inductor will both pass through the spacer wall 301 to form a magnetic circuit. The spacer wall 301 provides a common magnetic path with low magnetic resistance, realizing the decoupled integration of the transformer and the PFC inductor. This magnetic integration can improve the performance of the switching power supply, reduce the input and output current ripple of the switching power supply, and improve the transient response.

[0033] Please continue to refer to Figures 1-3 , in an embodiment of the present application, the multiple sub-magnets include a first sub-magnet 31, a second sub-magnet 32, and a third sub-magnet 33. The first sub-magnet 31, the second sub-magnet 32, and the third sub-magnet 33 are sequentially stacked and connected along the first direction A. The first sub-magnet 31 is connected to one side of the second sub-magnet 32, and a first cavity 310 is formed between the first sub-magnet 31 and the second sub-magnet 32. The third sub-magnet 33 is connected to the side of the second sub-magnet 32 away from the first sub-magnet 31, and a second cavity 320 is formed between the second sub-magnet 32 and the third sub-magnet 33. Among them, the first cavity 310 and the second cavity 320 are arranged at intervals along the first direction A, so that the first circuit board 10 and the second circuit board 20 are stacked along the first direction A, realizing the most compact stacking, higher integration, helping to further improve the power density, and being applicable to a power supply with a compact structure. It can be seen that in this structure, a part of the second sub-magnet 32 forms the spacer wall 301.

[0034] Specifically, the first sub-magnet 31 includes a first magnetic transverse wall 311 and two first magnetic side walls 312, and the two first magnetic side walls 312 are disposed on the same side of the first magnetic transverse wall 311. The second sub-magnet 32 includes a second magnetic transverse wall 321, wherein the second magnetic transverse wall 321 forms a spacer wall 301. The third sub-magnet 33 includes a third magnetic transverse wall 331 and two third magnetic side walls 332, and the two third magnetic side walls 332 are disposed on the same side of the third magnetic transverse wall 331. Along the first direction A, the two first magnetic side walls 312 are connected to one side of the second magnetic transverse wall 321, and the two third magnetic side walls 332 are connected to the other side of the second magnetic transverse wall 321. Among them, the main wall surfaces of the first magnetic transverse wall 311, the second magnetic transverse wall 321, and the third magnetic transverse wall 331 are all perpendicular to the first direction A, so that the first magnetic transverse wall 311, the second magnetic transverse wall 321, and the third magnetic transverse wall 331 are arranged parallel to each other and can be arranged at intervals along the first direction A, and the first magnetic transverse wall 311 and the second magnetic transverse wall 321 are connected by the two first magnetic side walls 312, and the second magnetic transverse wall 321 and the third magnetic transverse wall 331 are connected by the two third magnetic side walls 332. In this way, a space for accommodating the first circuit board 10 and the second circuit board 20 is formed, so that the two can be stacked along the first direction A.

[0035] Furthermore, the first sub-magnet 31 further includes a sub-magnetic core middle column 302, and the sub-magnetic core middle column 302 is disposed between the two first magnetic side walls 312, that is, the first sub-magnet 31 is of a similar "E" type structure and is simple to assemble. The second sub-magnet 32 further includes two sub-magnetic core middle columns 302, and the two sub-magnetic core middle columns 302 are respectively disposed on opposite sides of the second magnetic transverse wall 321. The third sub-magnet 33 further includes a sub-magnetic core middle column 302, and the sub-magnetic core middle column 302 is disposed between the two third magnetic side walls 332, that is, the third sub-magnet 33 is of a similar "E" type structure and is simple to assemble. The sub-magnetic core middle column 302 of the first sub-magnet 31 and one of the sub-magnetic core middle columns 302 of the second sub-magnet 32 are relatively spaced apart to form a magnetic core middle column 36, and each winding and coil in the first circuit board 10 are sleeved around the periphery of the magnetic core middle column 36. In this way, an air gap is formed in the magnetic core of the transformer, which helps to reduce the magnetic permeability, increase the saturation current, and increase the energy storage capacity. The sub-magnetic core middle column 302 of the third sub-magnet 33 and the other sub-magnetic core middle column 302 of the second sub-magnet 32 are relatively spaced apart to form another magnetic core middle column 36, and the PFC inductance coil in the second circuit board 20 is sleeved around the periphery of the magnetic core middle column 36. In this way, an air gap is formed in the magnetic core of the PFC inductance, which helps to reduce the magnetic permeability, increase the saturation current, and increase the energy storage capacity.

[0036] In a specific implementation, the structural design of the sub-magnets can be adjusted according to the layout of the printed circuit board, and the relative installation orientation of the integrated magnetic element 1 can be reasonably arranged. Among them, the integrated magnetic element 1 can be vertically installed in the switching power supply, that is, the first direction A is parallel to the thickness direction of the switching power supply, or it can be horizontally installed in the switching power supply, that is, the first direction A is perpendicular to the thickness direction of the switching power supply.

[0037] Please continue to refer to Figures 4-6 , in another embodiment of the present application, the multiple sub-magnets include a fourth sub-magnet 34 and a fifth sub-magnet 35. The fourth sub-magnet 34 and the fifth sub-magnet 35 are connected and jointly define a first cavity 310 and a second cavity 320. The first cavity 310 and the second cavity 320 are arranged at intervals along a second direction B perpendicular to the first direction A, so that the first circuit board 10 and the second circuit board 20 are arranged at intervals along the second direction. It can be seen that in the projection plane parallel to the plane of the first circuit board 10, the projection area of the magnet 30 is large, indicating that the heat dissipation area of the magnet 30 is large, having good heat dissipation performance and being able to reduce heat accumulation. In addition, the structure of the magnet 30 is suitable for a rectangular flat power supply.

[0038] The fourth sub-magnet 34 includes a fourth magnetic transverse wall 341 and two fourth magnetic side walls 342. The two fourth magnetic side walls 342 are arranged on the same side of the fourth magnetic transverse wall 341, and the two fourth magnetic side walls 342 are arranged opposite to each other along the second direction B. The fifth sub-magnet 35 includes a fifth magnetic transverse wall 351 and two fifth magnetic side walls 352. The two fifth magnetic side walls 352 are arranged on the same side of the fifth magnetic transverse wall 351, and the two fifth magnetic side walls 352 are arranged opposite to each other along the second direction B. The two fourth magnetic side walls 342 are connected to the two fifth magnetic side walls 352 in one-to-one correspondence. Compared with the scheme in which the first circuit board 10 and the second circuit board 20 are stacked along the first direction A, in this embodiment, the first circuit board 10 and the second circuit board 20 are arranged at intervals along the direction parallel to their board surfaces. The corresponding fourth sub-magnet 34 and fifth sub-magnet 35 have a large heat dissipation area, and the magnet 30 formed by assembly is more flat in shape and is suitable for a rectangular flat power supply.

[0039] In an embodiment of the present application, the fourth sub-magnet 34 further includes a first sub-separation wall 343. The two fourth magnetic side walls 342 are arranged on opposite sides of the first sub-separation wall 343 along the second direction B. The fifth sub-magnet 35 further includes a second sub-separation wall 353. The two fifth magnetic side walls 352 are arranged on opposite sides of the second sub-separation wall 353 along the second direction B. Among them, after the fourth sub-magnet 34 is connected to the fifth sub-magnet 35, the first sub-separation wall 343 is connected to the second sub-separation wall 353 correspondingly, as Figure 6As shown, a fifth magnetic sidewall 352, a fourth magnetic sidewall 342, a fourth magnetic transverse wall 341, a first sub-partition wall 343, a second sub-partition wall 353, and a fifth magnetic transverse wall 351 sequentially enclose and define a first cavity 310 in a clockwise direction. Another fifth magnetic sidewall, another fourth magnetic sidewall 342, a fourth magnetic transverse wall 341, a first sub-partition wall 343, a second sub-partition wall 353, and a fifth magnetic transverse wall 351 sequentially enclose and define a second cavity 320 in a counterclockwise direction. It should be noted that the first sub-partition wall 343 and the second sub-partition wall 353 together form a partition wall 301, that is, a part of the fourth sub-magnet 34 and a part of the fifth sub-magnet 35 form the partition wall 301. Among them, the partition wall 301 extends in the third direction to form a first cavity 310 and a second cavity 320 arranged at intervals along the second direction B between the fourth sub-magnet 34 and the fifth sub-magnet 35. The third direction, the first direction A, and the second direction B are perpendicular to each other in pairs. In a specific implementation, the height of the first sub-partition wall 343 can be configured to be equal to the height of the two fourth magnetic sidewalls 342, and the height of the second sub-partition wall 353 can be configured to be equal to the height of the two fifth magnetic sidewalls 352, which is convenient for processing and assembly.

[0040] Furthermore, the fourth sub-magnet 34 further includes two sub-magnetic core middle columns 302. A sub-magnetic core middle column 302 is provided between each fourth magnetic sidewall 342 and the first sub-partition wall 343. The fifth sub-magnet 35 further includes two sub-magnetic core middle columns 302. A sub-magnetic core middle column 302 is provided between each fifth magnetic sidewall 352 and the second sub-partition wall 353. Among them, after the fourth sub-magnet 34 and the fifth sub-magnet 35 are connected, each sub-magnetic core middle column 302 of the fourth sub-magnet 34 is arranged at intervals with a sub-magnetic core middle column 302 of the fifth sub-magnet 35 to form a magnetic core middle column 36. Thus, a magnetic core middle column 36 is provided in each of the first cavity 310 and the second cavity 320. Each winding and coil in the first circuit board 10 is sleeved on the periphery of the magnetic core middle column 36 in the first cavity 310, and the PFC inductance coil in the second circuit board 20 is sleeved on the periphery of the magnetic core middle column 36 in the second cavity 320, so that the magnetic cores of the transformer and the PFC inductance both form air gaps, which helps to reduce the magnetic permeability, increase the saturation current, and increase the energy storage capacity.

[0041] In another embodiment of the present application, the fourth sub-magnet 34 further includes a first sub-separation wall 343. The first sub-separation wall 343 is disposed between two fourth magnetic side walls 342. After each fourth magnetic side wall 342 is connected to a fifth magnetic side wall 352, the first sub-separation wall 343 abuts against the fifth magnetic transverse wall 351, so as to form a spaced first cavity 310 and a second cavity 320 between the fourth sub-magnet 34 and the fifth sub-magnet 35. In this embodiment, the structure of the fifth sub-magnet 35 is simpler and the cutting and forming are more convenient. It can be understood that along the first direction A, the height of the first sub-separation wall 343 is greater than the height of the fourth magnetic side wall 342, so that the first sub-separation wall 343 can be attached to and connected to the fifth magnetic transverse wall 351.

[0042] In another embodiment of the present application, the fifth sub-magnet 35 further includes a second sub-separation wall 353. The second sub-separation wall 353 is disposed between two fifth magnetic side walls 352. After each fourth magnetic side wall 342 is connected to a fifth magnetic side wall 352, the second sub-separation wall 353 abuts against the fourth magnetic transverse wall 341, so as to form a first cavity 310 and a second cavity 320 between the fourth sub-magnet 34 and the fifth sub-magnet 35. In this embodiment, the structure of the fourth sub-magnet 34 is simpler and the cutting and forming are more convenient. It can be understood that along the first direction A, the height of the second sub-separation wall 353 is greater than the height of the fifth magnetic side wall 352, so that the second sub-separation wall 353 can be attached to and connected to the fourth magnetic transverse wall 341.

[0043] Taking a mobile power supply as an example, in a mobile power supply with an output power of 65W, the integrated magnetic element 1 (including three sub-magnets stacked and connected along the first direction A) of the embodiment of the present application is used to replace the original discrete planar transformer and PFC inductance coil. On the premise that the overall size of the battery remains unchanged, the original structure can output 65W power, and the replaced structure can output 100W power. The power density is increased from 1.8W / cm3 to 2.77W / cm3, and the power density is increased by 53.9%. It can be seen that the integrated magnetic element 1 in the embodiment of the present application can effectively save the product space and improve the power density of the product.

[0044] In summary, the embodiment of the present application provides an integrated magnetic element 1, which integrates a transformer and a PFC inductor into a planar magnetic element. The maximum operating magnetic flux density of the integrated magnetic element 1 after integration is less than the sum of the magnetic flux densities of each discrete magnetic element (discrete transformer and PFC inductor), reducing the number and volume of magnetic elements in the switching power supply to form a more compact power supply structure and improve its power density. Among them, a printed circuit board is selected to replace the traditional winding coil, solving the problem of noise. In the integrated magnetic element 1 of the embodiment of the present application, the magnet 30 includes a partition wall 301, and two magnetic shunts are formed through the partition wall 301 to achieve decoupled integration, which helps to reduce heat generation. The integrated magnetic element 1 includes two structures, in one of which two printed circuit boards are arranged in a stacked manner, and in the other, two printed circuit boards are arranged at intervals, which can adapt to different power supply structures.

[0045] A switching power supply is a high-frequency power conversion device used to convert a voltage of one level into the voltage or current required by the user through different forms of architectures.

[0046] The embodiment of the present application also provides a switching power supply, including the above-mentioned integrated magnetic element 1.

[0047] The switching power supply further includes an input circuit, an output circuit, a converter, and a control circuit. Among them, the input circuit includes an input filter and an input rectifier. The input filter can eliminate interference from the power grid, and the input rectifier rectifies the input alternating current to obtain a relatively smooth direct current and supplies it to the converter. The output circuit includes an output filter and an output rectifier, and the output circuit is used to provide a stable and reliable direct current power supply according to the needs of the load. The control circuit can detect the output direct current voltage, compare it with the reference voltage, amplify it, and modulate the pulse width of the oscillator, thereby controlling the converter to ensure the stability of the output voltage. In a specific implementation, the switching power supply also requires a protection circuit, a synchronous rectification drive circuit, and some other auxiliary circuits.

[0048] In the embodiment of the present application, the converter includes the above-mentioned integrated magnetic element 1. In the switching power supply of the embodiment of the present application, the transformer and the PFC inductor are integrated in the converter to reduce the volume and loss of the magnetic element, facilitate the miniaturization of the converter, and help improve the power density of the switching power supply. After the PFC inductor and the transformer are integrated, they are used to adjust the relationship between the input and the output and optimize the performance of the converter. Optionally, the above-mentioned converter can be an isolated converter or a non-isolated converter.

[0049] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0050] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An integrated magnetic component, characterized in that: include: A first circuit board includes a primary winding circuit and a secondary winding circuit; A second circuit board, comprising a PFC circuit, and arranged side by side with the first circuit board; and The magnet includes a first cavity for accommodating the first circuit board and a second cavity for accommodating the second circuit board. The magnet also includes a partition wall, which is arranged between the first cavity and the second cavity to separate the first cavity from the second cavity.

2. The integrated magnetic component according to claim 1, characterized in that: The magnet includes a plurality of sub-magnets, which are stacked and connected along a first direction and define the first cavity and the second cavity.

3. The integrated magnetic component according to claim 2, characterized in that: The first cavity and the second cavity are arranged at intervals along the first direction; The plurality of sub-magnets include a first sub-magnet, a second sub-magnet and a third sub-magnet which are sequentially stacked and connected along a first direction, the first cavity is formed between the first sub-magnet and the second sub-magnet, and the second cavity is formed between the second sub-magnet and the third sub-magnet; Part of the second sub-magnet forms the partition wall.

4. The integrated magnetic component according to claim 3, characterized in that: The first sub-magnet comprises a first magnetic transverse wall and two first magnetic side walls arranged on the same side of the first magnetic transverse wall; The second sub-magnet includes a second magnetic transverse wall; The third sub-magnet comprises a third magnetic transverse wall and two third magnetic side walls arranged on the same side of the third magnetic transverse wall; Along the first direction, the two first magnetic side walls are connected to one side of the second magnetic transverse wall, and the two third magnetic side walls are connected to the other side of the second magnetic transverse wall; The second magnetic transverse wall forms the partition wall.

5. The integrated magnetic component according to claim 2, characterized in that: The first cavity and the second cavity are arranged at intervals along a second direction perpendicular to the first direction; The plurality of sub-magnets include a fourth sub-magnet and a fifth sub-magnet, the fourth sub-magnet is connected to the fifth sub-magnet, and the two together define the first cavity and the second cavity; A portion of the fourth sub-magnet forms the partition wall, and / or a portion of the fifth sub-magnet forms the partition wall.

6. The integrated magnetic component according to claim 5, characterized in that: The fourth sub-magnet comprises a fourth magnetic transverse wall, a first sub-spacer wall arranged on the same side of the fourth magnetic transverse wall, and two fourth magnetic side walls, wherein the two fourth magnetic side walls are arranged on two opposite sides of the first sub-spacer wall along the second direction; The fifth sub-magnet comprises a fifth magnetic transverse wall, a second sub-spacer wall arranged on the same side of the fifth magnetic transverse wall, and two fifth magnetic side walls, wherein the two fifth magnetic side walls are arranged on two opposite sides of the second sub-spacer wall along the second direction; The two fourth magnetic side walls are connected to the two fifth magnetic side walls in a one-to-one correspondence, and the first sub-spacer wall is connected to the second sub-spacer wall and the two together form the spacer wall.

7. The integrated magnetic component according to claim 2, characterized in that: The magnet further comprises two axially parallel magnetic core pillars, wherein one of the magnetic core pillars is arranged corresponding to the first cavity and the first circuit board is sleeved around the outer periphery of the magnetic core pillar, and the other magnetic core pillar is arranged corresponding to the second cavity and the second circuit board is sleeved around the outer periphery of the magnetic core pillar; At least one of the plurality of sub-magnets has the magnetic core center column.

8. The integrated magnetic component according to claim 7, characterized in that: Each of the sub-magnets has a sub-magnetic core column, the sub-magnetic core columns of two adjacent sub-magnets are arranged opposite to each other and form a magnetic core column, and the two sub-magnetic core columns of the same magnetic core column are coaxial and spaced apart.

9. The integrated magnetic component according to claim 1, characterized in that: The surface of the first circuit board is parallel to the surface of the second circuit board; The first cavity and the second cavity respectively penetrate the magnet along a preset direction, and the preset direction is perpendicular to an arrangement direction of the first cavity and the second cavity and parallel to a board surface of the first circuit board.

10. The integrated magnetic component according to claim 9, characterized in that: The first circuit board includes a first pin, and the second circuit board includes a second pin. The first pin and the second pin are led out from the same side of the magnet for electrical connection with an external circuit.

11. The integrated magnetic component according to claim 1, characterized in that: The first circuit board also includes an auxiliary circuit and an electromagnetic interference compensation circuit. The primary winding circuit, the auxiliary circuit, the electromagnetic interference compensation circuit and the secondary winding circuit are stacked in sequence.

12. A switching power supply, characterized in that: The integrated magnetic component comprises any one of claims 1 to 11.

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