Transformer structure with integrated inductance

Abstract

The application relates to the technical field of magnetic integration, in particular to a transformer structure integrated with an inductor, which comprises a magnetic core, a transformer winding and an inductor winding, the magnetic core comprises a magnetic yoke and a magnetic column connected with the magnetic yoke; the transformer winding is wound on the at least one magnetic column, and the transformer winding forms at least one transformer winding space; the inductor winding is at least partially accommodated in the at least one magnetic yoke or the at least one magnetic column of the magnetic core, so that the inductor winding penetrates the transformer winding space formed on a single magnetic column at most once, thereby decoupling the magnetic flux generated by the inductor winding and the magnetic flux generated by the transformer winding. The technical problem of the present application solves the technical problems of the existing magnetic integration structure, such as large volume, small power density, high loss, low flexibility caused by high coupling of the transformer and high manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of magnetic integration technology, and more particularly to a transformer structure with integrated inductors. Background Technology

[0002] LLC topology, as a common type of topology, has wide applications in various situations, especially in D2D applications, where LLC topology is quite common, such as... Figure 1 As shown, it can significantly improve the efficiency of D2D at high frequencies by satisfying the ZVS of the device through resonance, thereby achieving the goal of high power density and high efficiency.

[0003] A key characteristic of LLC (Limited-Resonance Circuit) is its ability to reduce switching losses through resonance, thereby increasing frequency, reducing the size of magnetic components, and ultimately achieving high power density and high efficiency. To achieve circuit resonance, a resonant inductor Lr needs to be introduced. The inductor Lr is a crucial component; its size and precision determine the circuit's operating characteristics, and its size loss is also part of the overall circuit performance. Lr can be a standalone magnetic component, but standalone inductors lack advantages due to their size loss; therefore, it is generally integrated into a transformer to obtain Lr.

[0004] Currently, Lightroom is generally integrated in the following ways:

[0005] Using the transformer leakage inductance Lk: Since the transformer leakage inductance Lk does not require a separate magnetic core and winding, using Lk as Lr has a lower cost in terms of losses. However, space needs to be left between the primary and secondary sides of the transformer to form the leakage inductance, thus increasing the transformer winding length and reducing the transformer power density. Integrating leakage inductance requires precise control of the winding structure dimensions, which is complex in terms of process.

[0006] One approach involves integrating the magnetic core: adding a portion of the inductor's core and windings outside the transformer body, and integrating the transformer core and inductor core as a single unit. Compared to using separate inductors, this approach reduces the maximum magnetic flux density because the transformer and inductor cores are integrated. However, the transformer's flux only flows through a portion of the core; that is, the transformer and inductor only share a portion of the core. Besides the core through which the transformer's flux flows, an additional core is needed specifically for the inductor, resulting in lower power density. Furthermore, the additional core increases the complexity of the magnetic components.

[0007] In summary, existing integrated solutions often suffer from drawbacks such as large size, low power density, high losses, or low flexibility due to high transformer coupling. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a transformer structure with integrated inductor to solve the technical problems of existing integrated structures, such as large size, low power density, high loss, or low flexibility and high manufacturing cost caused by high coupling of transformer.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A transformer with integrated inductance, comprising a magnetic core, transformer windings, and inductor windings, characterized in that:

[0011] The magnetic core includes a magnetic yoke and a magnetic column connected to the magnetic yoke;

[0012] The transformer winding is wound around the at least one magnetic post, and the transformer winding forms at least one transformer winding space;

[0013] The inductor winding is at least partially housed within at least one yoke or at least one magnetic post of the magnetic core, such that the inductor winding passes through the transformer winding space formed on a single magnetic post at most once, thereby decoupling the magnetic flux generated by the inductor winding from the magnetic flux generated by the transformer winding.

[0014] In some embodiments, the inductor winding is one turn.

[0015] In some embodiments, the magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction perpendicular to the inductive winding inside the magnetic core.

[0016] In some embodiments, the at least one magnetic post forms an integral magnetic post, and the splicing surfaces of the first magnetic core and the second magnetic core are abutted to form at least an integral space through the integral magnetic post and / or the magnetic yoke. The integral space includes an inductor winding accommodating space and an air gap for the inductor winding, and the inductor winding at least partially passes through the inductor winding accommodating space.

[0017] In some embodiments, the magnetic pillars or yokes containing air gaps in the magnetic core are spliced ​​together, while at least one of the remaining magnetic pillars or yokes is integrally formed.

[0018] In some embodiments, the splicing surfaces of the first magnetic core and the second magnetic core are each provided with at least one groove. The two grooves of the first magnetic core and the second magnetic core are joined together to form an inductor winding accommodating space that penetrates the integral magnetic column and / or magnetic yoke. The inductor winding passes through the inductor winding accommodating space at least partially. The gap formed by the splicing surfaces of the first magnetic core and the second magnetic core serves as an air gap for the inductor winding.

[0019] In some embodiments, the magnetic core is formed by splicing together at least a first magnetic core and a second magnetic core along the direction of the magnetic column extension;

[0020] The first magnetic core includes two integral magnetic pillars, a first sub-yoke and a second sub-yoke, and the second magnetic core includes a second yoke; wherein the first sub-yoke and the second yoke are spliced ​​together to form a first integral magnetic yoke, and the splicing surfaces of the first sub-yoke and the second yoke are connected to form a first inductor winding accommodating space that penetrates the first integral magnetic yoke.

[0021] The transformer winding includes a primary winding and a secondary winding, which surround at least one integral magnetic column to form the transformer winding space; the inductor winding passes through the first inductor winding accommodating space and passes through the transformer winding space zero times.

[0022] In some embodiments, the magnetic core further includes a third magnetic core, the third magnetic core includes a third magnetic yoke, the third magnetic yoke and the second sub-magnetic yoke are spliced ​​together to form a second integral magnetic yoke, and the splicing surface of the third magnetic yoke and the second sub-magnetic yoke forms a second inductor winding accommodating space that penetrates the second integral magnetic yoke;

[0023] The primary winding and secondary winding of the transformer surround at least one integral magnetic column to form a transformer winding space. The inductor winding passes through the first inductor winding accommodating space and the second inductor winding accommodating space respectively, and passes through the transformer winding space zero times.

[0024] In some embodiments, the magnetic core includes a yoke and at least two magnetic posts connected to the yoke, the transformer winding includes a primary winding and a secondary winding, the primary and secondary windings surround at least one of the magnetic posts to form at least one transformer winding space, and the magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction perpendicular to the extension of the magnetic post; wherein the first magnetic core includes at least a first magnetic post, and the second magnetic core includes at least a second magnetic post.

[0025] In some embodiments, the first magnetic post and the second magnetic post each include a splicing surface, the first magnetic post and the second magnetic post are spliced ​​together to form the integral magnetic post, the splicing surfaces of the first magnetic post and the second magnetic post are connected to form the inductor winding accommodating space that penetrates the integral magnetic post; the inductor winding at least partially passes through the inductor winding accommodating space and passes through the at least one transformer winding space once.

[0026] In some embodiments, the first magnetic core and the second magnetic core are spliced ​​together along a direction perpendicular to the upper surface of the first magnetic core. The first magnetic core includes two first magnetic pillars and two first magnetic yokes, and the second magnetic core includes two second magnetic pillars and two second magnetic yokes. The two first magnetic pillars are spliced ​​with the two second magnetic pillars to form two integral magnetic pillars, and the two first magnetic yokes and the two second magnetic yokes are spliced ​​together to form two integral magnetic yokes.

[0027] In some embodiments, the first magnetic core and the second magnetic core are spliced ​​together along a direction parallel to the upper surface of the first magnetic core. The first magnetic core includes two first magnetic pillars and two first magnetic yokes, and the second magnetic core includes a second magnetic pillar. One of the first magnetic pillars and the second magnetic pillar are spliced ​​together to form the integral magnetic pillar. The space between the splicing interfaces forms the inductor winding accommodating space. The inductor winding passes through the inductor winding space and passes through the transformer winding space once.

[0028] In some embodiments, the primary winding and secondary winding of the transformer respectively surround the two integral magnetic pillars to form two transformer winding spaces, and each integral magnetic pillar is formed by splicing together a first magnetic pillar and a second magnetic pillar.

[0029] The two inductor windings each pass through the space of the two transformer windings once.

[0030] In some embodiments, the magnetic core includes a yoke and three magnetic pillars (left, middle, and right) connected to the yoke. The middle magnetic pillar has an inductor winding accommodating space through it along its extension direction. The transformer primary winding and transformer secondary winding are wound around the middle magnetic pillar, and the transformer winding space is formed on the middle magnetic pillar.

[0031] The inductor winding is placed in the inductor winding accommodating space and passes through the transformer winding space once.

[0032] In some embodiments, the first magnetic core further includes two first magnetic yokes, and the second magnetic core further includes two second magnetic yokes. An integral magnetic yoke is formed by a first magnetic yoke and a second magnetic yoke, wherein the splicing surfaces of at least one first magnetic yoke and at least one second magnetic yoke are in contact to form an inductor winding accommodating space that penetrates at least one of the integral magnetic yokes; the inductor winding passes at least partially through the inductor winding accommodating space and passes through the at least one transformer winding space zero times.

[0033] In some embodiments, the first magnetic core includes two first magnetic pillars and two first magnetic yokes, the second magnetic core includes two second magnetic pillars and two second magnetic yokes, each of the integral magnetic pillars is formed by one first magnetic pillar and one second magnetic pillar, each of the integral magnetic yokes is formed by one first magnetic yoke and one second magnetic yoke, and the inductor winding accommodating space is perpendicular to the extension direction of the magnetic pillars.

[0034] In some embodiments, the inductor winding accommodating space is parallel to the extension direction of the magnetic post.

[0035] In some embodiments, the direction of the inductor winding is parallel to the extension direction of the magnetic post, or the angle between the direction of the inductor winding and the extension direction of the magnetic post is less than 90°.

[0036] In some embodiments, the magnetic core includes a magnetic yoke and four magnetic pillars connected to the magnetic yoke. The magnetic yoke has an inductor winding accommodating space. The primary winding and secondary winding of the transformer are wound on each of the magnetic pillars, forming internal spaces that are the transformer winding spaces respectively.

[0037] In some embodiments, the inductor winding and the inductor winding accommodating space are one or more, the inductor winding passes through the inductor winding accommodating space, and each inductor winding and the inductor winding accommodating space passes through any of the transformer winding spaces at most once or not at all.

[0038] In some embodiments, the inductor winding and the inductor winding accommodating space are each one, the inductor winding accommodating space passes through the magnetic yoke, and the inductor winding does not pass through the transformer winding space, and the inductor winding passes through the transformer winding space of the magnetic column zero times.

[0039] In some embodiments, the magnetic core has an air gap for an inductor winding that extends through and connects the inductor winding accommodating space and at least one of the magnetic posts.

[0040] In some embodiments, the difference in cross-sectional area between the two parts of the divided magnetic column perpendicular to the extension direction of the magnetic column is no more than 15%.

[0041] In some embodiments, the magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction perpendicular to the extension of the magnetic column, with the splicing surface at least partially located on diagonally opposite magnetic columns;

[0042] The first magnetic core and the second magnetic core are each provided with at least one groove on their splicing surfaces. After assembly, the two grooves are joined together to form a hole that runs through the magnetic core as an inductor winding accommodating space. The gap formed by the splicing surfaces of the first magnetic core and the second magnetic core is used as the air gap of the inductor winding.

[0043] In some embodiments, the magnetic core is composed of four or three magnetic pillars and / or a yoke spliced ​​together, with the splicing surfaces at least partially located on any two or more magnetic pillars, and the gap formed by the splicing surfaces serving as an air gap for the inductor winding.

[0044] In some embodiments, the thickness difference between the first magnetic post and the first magnetic yoke and the second magnetic post and the second magnetic yoke does not exceed 20% of the total thickness of the overall magnetic core after splicing.

[0045] In some embodiments, the inductor winding is integrally formed with the magnetic core.

[0046] In some embodiments, the transformer winding includes a primary winding of the transformer, and the inductor winding is directly connected in series with the primary winding of the transformer.

[0047] A power module includes a transformer with an integrated inductor as described above and an external circuit, characterized in that: the transformer winding includes a primary winding of the transformer, and the inductor winding is connected in series with the primary winding of the transformer through the external circuit.

[0048] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0049] The transformer structure with integrated inductor provided by this invention is simple to assemble, has high manufacturing efficiency, and the inductor winding is completely embedded in the magnetic core, occupying little space and having virtually no impact on the overall power density.

[0050] Compared to leakage inductance solutions, the transformer structure with integrated inductor Lr provided by this invention allows the primary and secondary windings of the transformer to be wound close together, thus shortening the transformer winding length and increasing the transformer power density.

[0051] Compared to the magnetic integration scheme, the transformer structure with integrated inductor Lr provided by this invention does not require an additional inductor core. The magnetic flux of the transformer flows through the entire core, meaning that the inductor Lr completely utilizes the transformer core, thus improving the power density. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of a D2D circuit topology in the prior art;

[0054] Figure 2A The diagram illustrates the transformer structure with integrated inductor shown in the first embodiment of the present invention.

[0055] Figure 2B A schematic diagram of another view of the transformer with integrated inductor shown in the first embodiment of the present invention;

[0056] Figure 2C This is a schematic diagram of the transformer winding space structure, consisting of the primary winding and the secondary winding of the transformer, in the first embodiment of the present invention.

[0057] Figure 3A This is a schematic diagram of the transformer structure with integrated inductor shown in the second embodiment of the present invention, based on the first embodiment.

[0058] Figure 3B This is a schematic diagram of the magnetic core and inductor winding structure shown in the second embodiment of the present invention. Figure 1 ;

[0059] Figure 3C This is a schematic diagram of the magnetic core and inductor winding structure according to the second embodiment of the present invention;

[0060] Figure 3D This is another preferred embodiment based on the transformer with integrated inductor shown in the second embodiment of the present invention;

[0061] Figures 4A-4B The diagram shows the transformer structure with integrated inductor as disclosed in the third embodiment of the present invention;

[0062] Figure 5A This is a schematic diagram of the transformer structure with integrated inductor shown in the fourth embodiment of the present invention;

[0063] Figure 5B This is a schematic diagram of the transformer structure with integrated inductor shown in the fifth embodiment of the present invention, based on the fourth embodiment.

[0064] Figures 5C-5D The diagram shows the transformer structure with integrated inductor as disclosed in the sixth embodiment of the present invention;

[0065] Figure 6A The diagram shows the transformer structure with integrated inductor as disclosed in the seventh embodiment of the present invention;

[0066] Figures 6B-6C This is to illustrate the transformer structure of the integrated inductor shown in the eighth embodiment of the present invention, which is based on the seventh embodiment;

[0067] Figure 7A This is a schematic diagram of the transformer structure of the integrated inductor according to the ninth embodiment of the present invention;

[0068] Figure 7B This is a schematic diagram of the transformer structure with integrated inductor shown in the tenth embodiment based on the ninth embodiment of the present invention;

[0069] Figures 7C-7DThis is a schematic diagram of the transformer structure with integrated inductor shown in the eleventh embodiment based on the ninth embodiment of the present invention;

[0070] Figure 7E This is a schematic diagram of the transformer structure with integrated inductor shown in the twelfth embodiment of the present invention;

[0071] 1-Magnetic core;

[0072] 201 - Transformer primary winding;

[0073] 202 - Transformer secondary winding;

[0074] 301 - Inductor winding;

[0075] 103 - Inductor winding housing space;

[0076] 10a - First magnetic core;

[0077] 10b - Second magnetic core;

[0078] 101a - First magnetic yoke;

[0079] 102a - First magnetic column;

[0080] 101b - Second yoke;

[0081] 102b - Second magnetic column;

[0082] 101-Magnetic yoke;

[0083] 102-Magnetic column. Detailed Implementation

[0084] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0085] The specification and subsequent claims use certain terms to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0086] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about", or "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0087] Figure 2A This is a schematic diagram of the transformer structure with integrated inductor according to the first embodiment of the present invention; Figure 2B This is a schematic diagram of another view of the transformer with integrated inductor according to the first embodiment of the present invention; Figure 2C This is a schematic diagram of the transformer winding spatial structure consisting of the primary winding 201 and the secondary winding 202 of the transformer with integrated inductor according to the first embodiment of the present invention. In this embodiment, the transformer includes a magnetic core 1, a primary winding 201, and a secondary winding 202. The magnetic core 1 includes two yokes and two magnetic pillars connected to the two yokes. (See reference...) Figure 2A and 2B There are two inductor winding accommodating spaces 103 on the magnetic core 1. Specifically, the inductor winding accommodating spaces 103 are disposed on the two magnetic pillars in this embodiment. In this embodiment, the two inductor windings 301 pass through the inductor winding accommodating spaces 103 respectively. The transformer primary winding 201 and transformer secondary winding 202 surround the magnetic pillars, as shown below. Figure 2C As shown, the internal spaces formed around the two magnetic pillars are the transformer winding spaces. In this embodiment, the inductor windings 301 all enter from one side of the transformer winding space of the two magnetic pillars and exit from the other side, that is, the inductor windings 301 pass through the transformer winding spaces on each of the two magnetic pillars once. This structure allows the magnetic flux of the transformer to flow through the entire magnetic core. The magnetic flux generated by the inductor windings 301 is orthogonally decoupled from the magnetic flux generated by the transformer windings, thus allowing them to work independently. Since the inductor core and the transformer core share a single core, there is no need to set up an additional core solely for inductor use, thus achieving a power density increase of approximately 20% compared to the magnetically integrated scheme. Figure 1As shown, the inductor winding 301 can be directly connected in series with the primary winding of the transformer, or it can be connected in series with the primary winding through an external circuit. The two inductor windings 301 can be connected to the beginning and end of the primary winding respectively, or the two sets of inductor windings 301 can be short-circuited and then connected to one end of the primary winding 201 of the transformer; the magnetic core is integrally formed using a powder core process. It should be noted that the inner and outer positions of the transformer primary winding 201 and the transformer secondary winding 202 can be interchanged.

[0088] Figures 3A-3C This is a schematic diagram of the transformer structure with integrated inductor according to the second embodiment of the present invention, based on the first embodiment; specifically, Figure 3A This is a schematic diagram of the transformer structure with integrated inductor according to the second embodiment of the present invention; Figure 3B This is a schematic diagram of the magnetic core and inductor winding structure of the second embodiment of the present invention. Figure 1 ; Figure 3C This is a schematic diagram of the magnetic core and inductor winding structure according to the second embodiment of the present invention; see also... Figures 3A-3C In this embodiment, the magnetic core is formed by splicing a first magnetic core 10a and a second magnetic core 10b along a direction perpendicular to the extension of the magnetic column, that is, splicing them along a direction perpendicular to the inductor winding 301 inside the magnetic core. The first magnetic core 10a includes a first magnetic column 102a and a first magnetic yoke 101a, and the second magnetic core 10b includes a second magnetic column 102b and a second magnetic yoke 101b. The first magnetic column 102a and the second magnetic column 102b form an integral magnetic column 102, and the first magnetic yoke 101a and the second magnetic yoke 101b form an integral magnetic yoke 101. The splicing surfaces of the first magnetic core 10a and the second magnetic core 10b are connected to form at least one integral space that runs through the integral magnetic column and / or the magnetic yoke. This integral space includes an inductor winding accommodating space and an air gap in the inductor winding 301. The inductor winding 301 at least partially passes through the inductor winding accommodating space 103. Optionally, all magnetic columns and magnetic yokes are spliced ​​together, or the magnetic columns or magnetic yokes containing air gaps in the magnetic cores are spliced ​​together, and at least one of the remaining magnetic columns and magnetic yokes is integrally formed.

[0089] In this embodiment, the splicing surfaces of the first magnetic core 10a and the second magnetic core 10b are each provided with at least one groove. The two grooves of the first magnetic core 10a and the second magnetic core 10b are joined together to form an inductor winding accommodating space 103 that penetrates the entire magnetic column and / or magnetic yoke. The inductor winding 301 passes through the inductor winding accommodating space 103 at least partially. The gap formed by the splicing surfaces of the first magnetic core 10a and the second magnetic core 10b serves as an air gap for the inductor winding 301.

[0090] See Figures 3A-3CIn detail, in this embodiment, the primary winding 201 and the secondary winding 202 of the transformer are wound around the integral magnetic pillars. The internal space formed by the winding on the two integral magnetic pillars is the transformer winding space. The inductor winding 301 enters from one side of the transformer winding space of the two integral magnetic pillars and exits from the other side. That is, the inductor winding 301 enters from one side of the transformer winding space on the two magnetic pillars and exits from the other side. That is, the inductor winding 301 enters from the transformer winding space on the two magnetic pillars once each. The splicing surfaces of the first magnetic core 10a and the second magnetic core 10b are provided with two grooved parts and a flat part. After assembly, the two grooved parts are joined to form a hole through the magnetic core 1, which is called the inductor winding accommodating space 103. The flat parts are joined together, and the gap in the middle forms the air gap of the inductor winding 301. Considering the uniform magnetic flux distribution in the upper and lower parts of the first magnetic core 10a and the second magnetic core 10b, the thickness difference 2ΔY between the first magnetic pillar 102a and the first magnetic yoke 101a and the second magnetic pillar 102b and the second magnetic yoke 101b does not exceed 10% of the total thickness, that is, it does not exceed 20% of the total thickness of the overall magnetic core after splicing. It is worth noting that in this embodiment, the inductor winding accommodating space 103 and the inductor winding 301 can be arranged along the extension direction of the magnetic pillar or inclined to the extension direction of the magnetic pillar. It should be noted that in this embodiment, the direction of the inductor winding 301 is parallel to the extension direction of the magnetic pillar, or the angle between the direction of the inductor winding 301 and the extension direction of the magnetic pillar is less than 90°. This invention simplifies the assembly of the magnetic core mold and the winding by using a splicing method. The splicing gap between the upper and lower magnetic core parts can adjust the inductance, facilitating the selection of circuit parameters. The magnetic core splicing can involve multiple parts, not just two.

[0091] Furthermore, Figure 3D This is another preferred embodiment based on the transformer with integrated inductor in the second embodiment of the present invention. The transformer structure with integrated inductor is the same as that in the second embodiment. Figures 3A-3C The structures disclosed in the previous version are similar, and the same component designations represent the same components, structures, and functions, so they will not be described again here. It should be noted that in this embodiment, the splicing surfaces of the first magnetic core 10a and the second magnetic core 10b are abutted to form a space penetrating the magnetic yoke. This space penetrates both magnetic yokes but not the magnetic pillars. This space includes a receiving space for the inductor winding and an air gap for the inductor winding. The inductor winding 301 at least partially passes through the inductor winding receiving space 103; specifically, as shown... Figure 3DAs shown, in this embodiment, the splicing surfaces of the two yokes of the first magnetic core 10a and the two yokes of the second magnetic core 10b are provided with at least one groove. The grooves of the two pairs of yokes are respectively connected to form an inductor winding accommodating space 103. The direction of the four grooves is parallel to the extension direction of the magnetic column. Therefore, the direction of the inductor winding accommodating space 103 formed by the connection is parallel to the extension direction of the magnetic column, but does not pass through the magnetic column. The inductor winding 301 passes through the inductor winding accommodating space 103. The gap formed by the splicing surfaces of the yokes serves as the air gap of the inductor winding 301. In this embodiment, the transformer primary winding 201 and the transformer secondary winding 202 are wound around the integral magnetic column. The internal space formed by their winding on the two integral magnetic columns is the transformer winding space. The inductor winding 301 does not pass through the inductor winding accommodating space 103 between the two integral magnetic columns, that is, the inductor winding 301 passes through the transformer winding space on the two magnetic columns zero times.

[0092] Furthermore, Figures 4A-4B This is a schematic diagram of the transformer structure with integrated inductor according to the third embodiment of the present invention; this embodiment is another preferred embodiment based on the first embodiment of the present invention, see reference. Figure 2A and Figures 4A-4B In this embodiment, the transformer includes a magnetic core 1, a primary winding 201, and a secondary winding 202. The magnetic core 1 includes two yokes and two magnetic pillars connected to the two yokes. Two inductor winding accommodating spaces 103 are located on the magnetic core 1. Specifically, the inductor winding accommodating spaces 103 are disposed on the two magnetic pillars in this embodiment. In this embodiment, the two inductor windings 301 pass through the inductor winding accommodating spaces 103 respectively. The transformer primary winding 201 and the secondary winding 202... The secondary winding 202 of the transformer surrounds the magnetic pillars, and the internal spaces formed by the winding on the two magnetic pillars are the transformer winding spaces. In this embodiment, the inductor windings 301 all enter from one side of the transformer winding spaces on the two magnetic pillars and exit from the other side, that is, the inductor windings pass through the transformer winding spaces on each of the two magnetic pillars once. This structure allows the magnetic flux of the transformer to flow through the entire magnetic core, and the magnetic flux generated by the inductor winding 301 is orthogonally decoupled from the magnetic flux generated by the transformer windings, thus allowing them to work independently. It is worth noting that the magnetic core in this embodiment is spliced ​​together in a direction perpendicular to the extension direction of the two magnetic pillars, and can be spliced ​​together from two or three parts, but is not limited to this. Figure 4A As shown, in this embodiment, the magnetic core is formed by splicing together two parts perpendicular to the extension direction of the two magnetic pillars; the splicing surface is located in one of the magnetic pillars. In this case, in the transformer structure, one magnetic pillar is formed by splicing together two parts, the first sub-magnetic pillar and the second sub-magnetic pillar, while the other magnetic pillar is a single integral magnetic pillar. Both yokes are formed by splicing together two sub-yokes, the first sub-yoke and the second sub-yoke; or as shown... Figure 4BAs shown, the magnetic core in this embodiment is spliced ​​together in a direction perpendicular to the extension direction of the two magnetic pillars, and is composed of three parts; the first magnetic pillar and the second magnetic pillar of the magnetic core each include a splicing surface, and the first magnetic pillar and the second magnetic pillar each include a first sub-magnetic pillar and a second sub-magnetic pillar. The first sub-magnetic pillar and the second sub-magnetic pillar are spliced ​​together to form an integral magnetic pillar, and the splicing surface is connected to form an inductor winding accommodating space 103 that penetrates the integral magnetic pillar and passes through the at least one transformer winding space once.

[0093] Figure 5A This is a schematic diagram of the transformer structure with integrated inductor according to the fourth embodiment of the present invention. A transformer is composed of a magnetic core 1, a primary winding 201, and a secondary winding 202. In this embodiment, the magnetic core 1 is composed of two magnetic pillars and two magnetic yokes connected to the two magnetic pillars. The magnetic yokes include an inductor winding accommodating space 103. In this embodiment, the inductor winding accommodating space 103 is perpendicular to the extension direction of the magnetic pillars. The primary winding 201 and the secondary winding 202 of the transformer are wound around the magnetic pillars. The internal space formed by their winding on the two magnetic pillars is the transformer winding space. The inductor winding 301 does not pass through the transformer winding space 103, that is, the inductor winding 301 passes through the transformer winding space on the two magnetic pillars zero times. This structure makes the magnetic flux generated by the inductor winding 301 orthogonally decoupled from the magnetic flux generated by the transformer winding, so that the two can work independently. The space occupied by the inductor winding has no effect on the turn length of the transformer winding. Since the winding is not covered by the yoke, the cross-sectional area of ​​the inductor core and the cross-sectional area of ​​the yoke core can be adjusted independently, which allows for greater flexibility in the inductor parameters and facilitates circuit design.

[0094] It is worth noting that in this embodiment, the inductor winding 301 can be pre-placed in the core mold and integrally formed with the core, or it can be set in the core formed by splicing two or three parts of the core along the direction perpendicular to or parallel to the extension of the magnetic column.

[0095] Figure 5B This is a schematic diagram of the transformer structure of the integrated inductor in the fifth embodiment of the present invention, disclosed based on the fourth embodiment; as shown below. Figure 5BAs shown, in this embodiment, the magnetic core is formed by splicing a first magnetic core 10a and a second magnetic core 10b along a direction perpendicular to the extension of the magnetic column. The first magnetic core 10a is composed of two first magnetic columns and two first magnetic yokes, and the second magnetic core 10b is composed of two second magnetic columns and two second magnetic yokes. The first magnetic columns and the second magnetic columns form an integral magnetic column, and the first magnetic yoke and the second magnetic yoke form an integral magnetic yoke. In this embodiment, a groove is provided on the splicing surface of the first magnetic yoke and the second magnetic yoke. The two grooves of the first magnetic yoke and the second magnetic yoke are joined to form an inductor winding accommodating space 103 of an integral magnetic yoke. The inductor winding passes through the inductor winding accommodating space 103 at least partially. The gap formed by the splicing surfaces of the first magnetic core 10a and the second magnetic core 10b serves as an air gap for the inductor winding 301. At this time, the primary winding 201 and the secondary winding 202 of the transformer are wound around the magnetic column. The internal space formed by their winding on the two magnetic columns is the transformer winding space. The inductor winding 301 does not pass through the transformer winding space 103, that is, the inductor winding 301 passes through the transformer winding space on the two magnetic columns zero times.

[0096] Further, see Figures 5C-5D This is a schematic diagram of the transformer structure of the integrated inductor in the sixth embodiment of the present invention; as shown. Figure 5C As shown, in this embodiment, the magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction parallel to the extension of the magnetic pillars. The first magnetic core includes two integral magnetic pillars, a first sub-yoke, and a second sub-yoke. The second magnetic core includes a second magnetic yoke. The first sub-yoke and the second magnetic yoke are spliced ​​to form a first integral magnetic yoke. The splicing surfaces of the first sub-yoke and the second magnetic yoke are connected to form a first inductor winding accommodating space that penetrates the first integral magnetic yoke. That is, the two grooves of the first sub-yoke and the second magnetic yoke are connected to form an inductor winding accommodating space 103 of the integral magnetic yoke. The inductor winding 301 passes through the inductor winding accommodating space 103 at least partially. The gap formed by the splicing surfaces is used as an air gap for the inductor winding. At this time, the primary winding 201 and the secondary winding 202 of the transformer are wound around the magnetic column. The internal space formed by their winding on the two integral magnetic columns is the transformer winding space. The inductor winding 301 does not pass through the transformer winding space 103, that is, the inductor winding 301 passes through the transformer winding space on the two integral magnetic columns zero times.

[0097] Furthermore, such as Figure 5DAs shown, the magnetic core in this embodiment can be composed of a first magnetic core, a second magnetic core, and a third magnetic core. The first magnetic core includes two integral magnetic pillars, a first sub-yoke, and a second sub-yoke. The second magnetic core includes a second magnetic yoke, and the third magnetic core includes a third magnetic yoke. In this embodiment, the first sub-yoke and the second magnetic yoke can form an integral magnetic yoke. A groove is provided on the splicing surface between the first sub-yoke and the second magnetic yoke. The two grooves of the first sub-yoke and the second magnetic yoke are joined to form an inductor winding accommodating space 103 of an integral magnetic yoke. The second sub-yoke and the third magnetic yoke can form an integral magnetic yoke. A groove is provided on the splicing surface between the second sub-yoke and the third magnetic yoke. The two grooves of the second sub-yoke and the third magnetic yoke are joined to form an inductor winding accommodating space 103 of another integral magnetic yoke. The inductor winding 301 at least partially passes through the inductor winding accommodating space 103, and the gap formed by the splicing surfaces serves as an air gap for the inductor winding 301. At this time, the primary winding 201 and the secondary winding 202 of the transformer are wound around the magnetic column. The internal space formed by their winding on the two integral magnetic columns is the transformer winding space. The inductor winding 301 does not pass through the transformer winding space 103, that is, the inductor winding 301 passes through the transformer winding space on the two integral magnetic columns zero times.

[0098] Figure 6A The schematic diagram of the transformer structure with integrated inductor according to the seventh embodiment of the present invention is shown. It is a three-column transformer. The transformer includes a magnetic core 1, a primary winding 201, and a secondary winding 202. The magnetic core includes a yoke and three magnetic columns (left, middle, and right) connected to the yoke. The middle magnetic column has an inductor winding accommodating space 103 extending through it. The primary winding 201 and the secondary winding 202 are wound around the middle magnetic column, forming the transformer winding space. The inductor winding 301 is placed in the inductor winding accommodating space 103 and passes through the transformer winding space once. In this structure, only the middle column of the magnetic core is wrapped by the winding, resulting in a larger exposed area and better heat dissipation, which is more beneficial for heat dissipation when the core loss is high.

[0099] Furthermore, the magnetic core in this embodiment can also be formed by splicing two parts along a direction perpendicular to the extension of the magnetic post, see reference. Figures 6B-6C A schematic diagram of the transformer structure with integrated inductor, based on the seventh embodiment of the present invention, is disclosed; as shown. Figure 6BAs shown, in this embodiment, the magnetic core is formed by splicing two upper and lower magnetic core parts, namely a first magnetic core 10a and a second magnetic core 10b. The intermediate magnetic pillar includes a first sub-magnetic pillar and a second sub-magnetic pillar arranged vertically. The splicing surface has a groove along the extension direction of the intermediate pillar. The two grooves in the extension direction of the intermediate magnetic pillar form an inductor winding accommodating space 103. The transformer primary winding 201 and the transformer secondary winding 202 are wound around the intermediate magnetic pillar, forming the transformer winding space. The inductor winding 301 is placed in the inductor winding accommodating space 103 and passes through the transformer winding space once. Figure 6C As shown, in this embodiment, the magnetic core is formed by splicing two magnetic core parts in the horizontal direction. The two magnetic core parts are spliced ​​together along the direction perpendicular to the extension of the magnetic column. The middle magnetic column includes a first sub-magnetic column and a second sub-magnetic column arranged horizontally. The splicing surface has a groove along the extension direction of the middle column. The two grooves in the extension direction of the middle magnetic column form an inductor winding accommodating space 103. The transformer primary winding 201 and the transformer secondary winding 202 are wound around the middle magnetic column to form the transformer winding space. The inductor winding 301 is placed in the inductor winding accommodating space 103 and passes through the transformer winding space once.

[0100] Figure 7A The schematic diagram of the transformer structure of the integrated inductor in the ninth embodiment of the present invention is shown, which is a four-column transformer. In this embodiment, the magnetic core includes a magnetic yoke and four magnetic columns connected to the magnetic yoke. The magnetic yoke is provided with an inductor winding accommodating space 103. The transformer primary winding 201 and the transformer secondary winding 202 are wound on each of the magnetic columns, and the internal spaces formed are the transformer winding spaces. It should be noted that in this embodiment, the inductor winding 301 and the inductor winding accommodating space 103 can be one or more. In addition, in this embodiment, the inductor winding 301 passes through the inductor winding accommodating space 103, but each inductor winding 301 and the inductor winding accommodating space 103 does not pass through the transformer winding space, that is, the inductor winding 301 passes through the transformer winding space on the magnetic column zero times. In this embodiment, the structure ensures that the magnetic flux generated by the inductor winding 301 is closed within the yoke and does not flow through the magnetic column, thus decoupling it from the magnetic flux generated by the transformer winding. This allows both to operate independently and is also applicable to transformers with more magnetic column structures. It is worth noting that in this embodiment, multiple inductor windings and multiple inductor winding accommodating spaces can also be provided on the magnetic core 1. The inductor winding 301 passes through the inductor winding accommodating space 103. Furthermore, the multiple inductor windings and multiple inductor winding accommodating spaces can pass through any of the magnetic columns or not. This transformer structure integrates inductors without increasing the magnetomotive force outside the magnetic core, thus avoiding the problem of increased losses caused by this magnetomotive force.

[0101] Figure 7B The diagram shows a transformer structure with an integrated inductor, based on the ninth embodiment of the present invention. It is a four-column transformer. The magnetic core structure disclosed in this embodiment has a slit as an air gap for the inductor, which connects the inductor winding accommodating space 103 and a magnetic column. In order to make the deviation of Bm between the two parts of the magnetic column through which the inductor winding space passes less than 15%, the difference in cross-sectional area between the two parts of the divided magnetic column perpendicular to the extension direction of the magnetic column is not greater than 15%, and the two parts are preferably the same area. This structure can reduce the inductance Lr by increasing the width of the slit, while not affecting the distribution of the main magnetic flux of the transformer, and ensuring that the coupling relationship between the four columns of the transformer remains unchanged.

[0102] Figures 7C-7D The diagram shows the structure of the integrated inductor transformer according to the eleventh embodiment based on the ninth embodiment of the present invention. It is a four-column transformer. The magnetic core is formed by splicing a first magnetic core and a second magnetic core along the direction perpendicular to the extension of the magnetic column. The splicing surface is at least partially located on the diagonal magnetic column. The splicing surface of the first magnetic core 10a and the second magnetic core 10b is provided with at least one groove. After assembly, the two grooves are joined to form a hole through the magnetic core as an inductor winding accommodating space 103. The gap formed by the splicing surfaces of the first magnetic core and the second magnetic core is used as the air gap of the inductor winding 301. The design of this structure simplifies the manufacturing method of the magnetic core air gap.

[0103] Further, see Figure 7E , Figure 7E This is a schematic diagram of the transformer structure of the integrated inductor according to the twelfth embodiment of the present invention. In this embodiment, the magnetic core is composed of four or three magnetic pillars and / or a yoke joined together. The joining surfaces are at least partially located on any two or more magnetic pillars, and the gaps formed by the joining surfaces serve as air gaps for the inductor winding 301. Compared to a two-part composition, this method results in a greater number of air gaps in the core. Therefore, under the same conditions, the size of each air gap can be smaller, and the losses caused by leakage flux due to the air gaps can also be lower.

[0104] It should be noted that the inductor winding in this invention can be placed in the inductor winding accommodating space pre-formed in the magnetic core, or the inductor winding and the magnetic core can be integrally formed.

[0105] The transformer windings described in this scheme include the primary winding of the transformer, and the inductor winding is directly connected in series with the primary winding of the transformer.

[0106] Another embodiment of the present invention provides a power module including a transformer with integrated inductance as described above and an external circuit. The transformer winding includes a primary winding of the transformer, and the inductor winding is connected in series with the primary winding of the transformer through the external circuit.

[0107] The transformer structure with integrated inductor provided by this invention is simple to assemble, has high manufacturing efficiency, and the inductor winding is completely embedded in the magnetic core, occupying little space and having virtually no impact on the overall power density.

[0108] Compared to leakage inductance solutions, the integrated inductor transformer structure provided by this invention does not require space between the primary and secondary sides of the transformer to form leakage inductance. Therefore, the transformer winding length is shortened and the transformer power density is increased.

[0109] Compared to magnetically integrated solutions, the transformer structure with integrated inductor provided by this invention does not require an additional inductor core, thus improving power density.

[0110] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A transformer with integrated inductance, comprising a magnetic core, transformer windings, and inductor windings, characterized in that: The magnetic core includes a magnetic yoke and a magnetic column connected to the magnetic yoke; The transformer winding is wound on the at least one magnetic post, and the transformer winding forms at least one transformer winding space; The inductor winding is at least partially housed within at least one yoke or at least one magnetic column of the magnetic core, such that the inductor winding passes through the transformer winding space formed on a single magnetic column at most once, thereby decoupling the magnetic flux generated by the inductor winding from the magnetic flux generated by the transformer winding in an orthogonal manner. The magnetic core is formed by splicing together at least a first magnetic core and a second magnetic core along a direction perpendicular to the inductive winding inside the magnetic core; The first magnetic core and the second magnetic core are both provided with at least one groove on their splicing surfaces. The two grooves of the first magnetic core and the second magnetic core are joined together to form an inductor winding accommodating space that runs through the magnetic core. The inductor winding passes through the inductor winding accommodating space at least partially. The gap formed by the splicing surfaces of the first magnetic core and the second magnetic core serves as an air gap for the inductor winding.

2. The transformer with integrated inductor according to claim 1, characterized in that: The inductor winding has one turn.

3. The transformer with integrated inductor according to claim 1, characterized in that: The at least one magnetic pillar forms an integral magnetic pillar, and the splicing surfaces of the first magnetic core and the second magnetic core are in contact to form at least an integral space that runs through the integral magnetic pillar and / or the magnetic yoke. The integral space includes an accommodating space for the inductor winding and an air gap for the inductor winding. The inductor winding passes at least partially through the accommodating space for the inductor winding.

4. The transformer with integrated inductor according to claim 1, characterized in that: The magnetic core containing the air gap magnetic column or yoke is spliced ​​together, while at least one of the remaining magnetic columns and the magnetic yoke is integrally formed.

5. The transformer with integrated inductor according to claim 1, characterized in that: The two grooves of the first magnetic core and the second magnetic core are joined to form an inductor winding accommodating space that runs through the integral magnetic column and / or magnetic yoke, and the inductor winding passes at least partially through the inductor winding accommodating space.

6. The transformer with integrated inductor according to claim 1, characterized in that: The magnetic core is formed by splicing together at least a first magnetic core and a second magnetic core along the direction of the magnetic column extension; The first magnetic core includes two integral magnetic pillars, a first sub-yoke and a second sub-yoke, and the second magnetic core includes a second yoke; wherein the first sub-yoke and the second yoke are spliced ​​together to form a first integral magnetic yoke, and the splicing surfaces of the first sub-yoke and the second yoke are connected to form a first inductor winding accommodating space that penetrates the first integral magnetic yoke. The transformer winding includes a primary winding and a secondary winding, which surround at least one integral magnetic column to form the transformer winding space; the inductor winding passes through the first inductor winding accommodating space and passes through the transformer winding space zero times.

7. The integrated inductor transformer according to claim 6, characterized in that: The magnetic core also includes a third magnetic core, which includes a third magnetic yoke. The third magnetic yoke and the second sub-magnetic yoke are spliced ​​together to form a second integral magnetic yoke. The splicing surface of the third magnetic yoke and the second sub-magnetic yoke forms a second inductor winding accommodating space that penetrates the second integral magnetic yoke. The primary winding and secondary winding of the transformer surround at least one integral magnetic column to form a transformer winding space. The inductor winding passes through the first inductor winding accommodating space and the second inductor winding accommodating space respectively, and passes through the transformer winding space zero times.

8. The transformer with integrated inductor according to claim 3, characterized in that: The magnetic core includes a yoke and at least two magnetic posts connected to the yoke. The transformer winding includes a primary winding and a secondary winding. The primary and secondary windings surround at least one of the magnetic posts to form at least one transformer winding space. The magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction perpendicular to the extension of the magnetic post. The first magnetic core includes at least one first magnetic post, and the second magnetic core includes at least one second magnetic post.

9. The integrated inductor transformer according to claim 8, characterized in that: The first magnetic column and the second magnetic column each include a splicing surface. The first magnetic column and the second magnetic column are spliced ​​together to form the integral magnetic column. The splicing surfaces of the first magnetic column and the second magnetic column are connected to form the inductor winding accommodating space that penetrates the integral magnetic column. The inductor winding passes through the inductor winding accommodating space at least partially and passes through the at least one transformer winding space once.

10. The integrated inductor transformer according to claim 9, characterized in that: The first magnetic core and the second magnetic core are spliced ​​together along a direction perpendicular to the upper surface of the first magnetic core. The first magnetic core includes two first magnetic pillars and two first magnetic yokes, and the second magnetic core includes two second magnetic pillars and two second magnetic yokes. The two first magnetic pillars are spliced ​​with the two second magnetic pillars to form two integral magnetic pillars, and the two first magnetic yokes and the two second magnetic yokes are spliced ​​together to form two integral magnetic yokes.

11. The integrated inductor transformer according to claim 9, characterized in that: The first magnetic core and the second magnetic core are spliced ​​together in a direction parallel to the upper surface of the first magnetic core. The first magnetic core includes two first magnetic pillars and two first magnetic yokes. The second magnetic core includes a second magnetic pillar. One of the first magnetic pillars and the second magnetic pillar are spliced ​​together to form the integral magnetic pillar. The space between the splicing interfaces forms the inductor winding accommodating space. The inductor winding passes through the inductor winding accommodating space and passes through the transformer winding space once.

12. The integrated inductor transformer according to claim 9, characterized in that: The primary winding and secondary winding of the transformer respectively surround the two integral magnetic pillars to form two transformer winding spaces. Each integral magnetic pillar is formed by splicing together a first magnetic pillar and a second magnetic pillar. The two inductor windings each pass through the space of the two transformer windings once.

13. The integrated inductor transformer according to claim 9, characterized in that: The magnetic core includes a magnetic yoke and three magnetic pillars (left, middle, and right) connected to the magnetic yoke. An inductor winding accommodating space is provided through the middle magnetic pillar along its extension direction. The transformer primary winding and transformer secondary winding are wound around the middle magnetic pillar, forming the transformer winding space. The inductor winding is placed in the inductor winding accommodating space and passes through the transformer winding space once.

14. The integrated inductor transformer according to claim 3, characterized in that: The first magnetic core further includes two first magnetic yokes, and the second magnetic core further includes two second magnetic yokes. An integral magnetic yoke is formed by a first magnetic yoke and a second magnetic yoke, wherein the splicing surfaces of at least one first magnetic yoke and at least one second magnetic yoke are in contact to form an inductor winding accommodating space that penetrates at least one of the integral magnetic yokes. The inductor winding passes at least partially through the inductor winding accommodating space and passes through the at least one transformer winding space zero times.

15. The integrated inductor transformer according to claim 14, characterized in that: The first magnetic core includes two first magnetic pillars and two first magnetic yokes, and the second magnetic core includes two second magnetic pillars and two second magnetic yokes. Each integral magnetic pillar is formed by one first magnetic pillar and one second magnetic pillar, and each integral magnetic yoke is formed by one first magnetic yoke and one second magnetic yoke. The inductor winding accommodating space is perpendicular to the extension direction of the magnetic pillars.

16. The integrated inductor transformer according to claim 14, characterized in that: The inductor winding accommodating space is parallel to the extension direction of the magnetic post.

17. The transformer with integrated inductor according to claim 9 or 16, characterized in that: The direction of the inductor winding is parallel to the extension direction of the magnetic post, or the angle between the direction of the inductor winding and the extension direction of the magnetic post is less than 90°.

18. The integrated inductor transformer according to claim 16, characterized in that: The transformer winding includes a primary winding and a secondary winding. The magnetic core includes a yoke and four magnetic pillars connected to the yoke. The yoke has an inductor winding accommodating space. The primary winding and the secondary winding are wound on each of the magnetic pillars, forming internal spaces that are the transformer winding spaces.

19. The integrated inductor transformer according to claim 18, characterized in that: The inductor winding and the inductor winding accommodating space are one or more, the inductor winding passes through the inductor winding accommodating space, and each inductor winding and the inductor winding accommodating space passes through any of the transformer winding spaces at most once or not at all.

20. The integrated inductor transformer according to claim 19, characterized in that: The inductor winding and the inductor winding accommodating space are each one. The inductor winding accommodating space passes through the magnetic yoke, and the inductor winding does not pass through the transformer winding space. The inductor winding passes through the transformer winding space of the magnetic column zero times.

21. The integrated inductor transformer according to claim 18, characterized in that: The magnetic core has an air gap for the inductor winding, and the air gap passes through and connects the inductor winding accommodating space and at least one of the magnetic pillars therein.

22. The integrated inductor transformer according to claim 21, characterized in that: The difference in cross-sectional area between the two parts of the divided magnetic column perpendicular to the extension direction of the magnetic column is no more than 15%.

23. The integrated inductor transformer according to claim 18, characterized in that: The magnetic core is formed by splicing a first magnetic core and a second magnetic core along a direction perpendicular to the extension of the magnetic column, with the splicing surface at least partially located on the diagonal magnetic column; The first magnetic core and the second magnetic core are each provided with at least one groove on their splicing surfaces. After assembly, the two grooves are joined together to form a hole that runs through the magnetic core as an inductor winding accommodating space. The gap formed by the splicing surfaces of the first magnetic core and the second magnetic core is used as the air gap of the inductor winding.

24. The integrated inductor transformer according to claim 18, characterized in that: The magnetic core is composed of four or three magnetic pillars and / or a magnetic yoke spliced ​​together, with the splicing surface located at least partially on any two or more magnetic pillars, and the gap formed by the splicing surfaces serving as an air gap for the inductor winding.

25. The transformer with integrated inductor according to claim 1, characterized in that: The first magnetic core includes at least one first magnetic post, and the second magnetic core includes at least one second magnetic post. The thickness difference between the first magnetic post and the first magnetic yoke and the second magnetic post and the second magnetic yoke does not exceed 20% of the total thickness of the overall magnetic core after splicing.

26. The transformer with integrated inductor according to claim 1, characterized in that: The inductor winding is integrally formed with the magnetic core.

27. The transformer with integrated inductor according to claim 1, characterized in that: The transformer winding includes the primary winding of the transformer, and the inductor winding is directly connected in series with the primary winding of the transformer.

28. A power module comprising a transformer with an integrated inductor as described in claim 1 and an external circuit, characterized in that: The transformer winding includes a primary winding, and the inductor winding is connected in series with the primary winding via an external circuit.

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