Transformer and inductor magnetic integration structure and switching power supply

Abstract

The application discloses a transformer and inductance magnetic integrated structure and a switching power supply. The transformer and inductance magnetic integrated structure comprises at least one module, each module comprising a plurality of transformer middle columns, the number of the transformer middle columns being greater than or equal to 2; a plurality of inductance middle columns, the number of the inductance middle columns being greater than or equal to 1; one primary winding, surrounding all the transformer middle columns and the inductance middle columns in the module; and secondary windings, the number of the secondary windings being the same as that of the transformer middle columns in the module, and each of the secondary windings being wound on each of the transformer middle columns in the module and then being connected in parallel. The application can reduce the area and volume of traditional discrete magnetic components, improve transmission efficiency and reduce manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a transformer and inductor magnetic integrated structure and switching power supply. BACKGROUND

[0002] In recent years, with the application of wide bandgap power devices such as gallium nitride and silicon carbide, small size and low loss of power electronic converters have gradually become a new trend of development and application. As important components of power electronic converters, transformers and inductors undertake the tasks of electrical isolation, voltage conversion and energy buffering, and are key components that affect the efficiency, size and power density of the converter.

[0003] However, traditional magnetic device design usually requires separate design of transformers and inductors, which usually requires a large board area. The size and loss of the designed transformer and inductor are large. In addition, circuit connection is required between the transformer and the inductor, and there is a large termination loss at the connection. In addition, the size of the separately designed inductor is usually small, which is not convenient for circuit layout and wiring.

[0004] Therefore, it is of great significance to improve the power density and transmission efficiency of power electronic converters by adopting magnetic integration technology to integrate transformers and inductors into one magnetic core. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a transformer and inductor magnetic integrated structure and switching power supply to overcome at least one of the above-mentioned deficiencies in the prior art.

[0006] As a first aspect of the present application, the technical scheme of the embodiment of the transformer and inductor magnetic integrated structure provided is as follows:

[0007] A transformer and inductor magnetic integrated structure, comprising:

[0008] a plurality of transformer columns, the number of which is greater than or equal to 2;

[0009] a plurality of inductor columns, the number of which is greater than or equal to 1;

[0010] one primary winding, which surrounds all transformer columns and inductor columns in the module where it is located;

[0011] a plurality of secondary windings, the number of which is the same as the number of transformer columns in the module where it is located, and each of which is wound on a transformer column in the module where it is located and then connected in parallel.

[0012] Preferably, each column in each module is arranged in sequence along a horizontal line.

[0013] Further, each transformer column and each inductor column in each module comprises an air gap.

[0014] Further, the column cross-sectional area, air gap height and secondary winding turns in each transformer in each module are equal.

[0015] Further, the primary winding winding direction in adjacent modules is opposite, and the secondary winding winding direction in adjacent modules is opposite, thereby generating magnetic fluxes in the magnetic columns of adjacent modules in opposite directions.

[0016] Further, the transformer and inductor magnetic integrated structure further comprises:

[0017] x side columns, wherein x is a natural number greater than or equal to 2;

[0018] a top cover;

[0019] a bottom cover;

[0020] The positions of the x side columns, the top cover and the bottom cover are arranged such that the main magnetic flux of each middle column in each module forms a closed magnetic circuit through the x side columns, the top cover and the bottom cover.

[0021] Further, each side column is connected to the top cover and the bottom cover at both ends, and has no air gap.

[0022] Preferably, x is 2.

[0023] Preferably, the primary windings in each module are connected in series, and the secondary windings are connected in series.

[0024] As a second aspect of the present application, an embodiment of a switching power supply is provided as follows:

[0025] A switching power supply, wherein: the transformer and inductor magnetic integrated structure of any one of the above first aspect is included.

[0026] The present application has the following advantages:

[0027] (1) The embodiment of the present application integrates the transformer and the inductor on the same magnetic core, which can reduce the board area and volume of the magnetic core device, improve the power density of the power electronic converter, reduce the manufacturing cost, and eliminate the end termination loss between the traditional discrete inductor and the transformer.

[0028] (2) In the transformer and inductor magnetic integrated structure of the embodiment of the present application, each primary winding surrounds all middle columns in the corresponding module, and each secondary winding is wound in parallel on the corresponding transformer middle column, so that the excitation inductance and series inductance can be adjusted by adjusting the air gap height, cross-sectional area and turns of the corresponding primary winding and secondary winding of each transformer middle column and inductor middle column, and the turns ratio of the transformer can also be adjusted conveniently.

[0029] (3) The primary winding winding direction of the transformer and the inductor magnetic integration structure adjacent modules of the embodiment of the application is opposite, the secondary winding winding direction is opposite, and then the magnetic flux in the magnetic column of the adjacent module is opposite, the mutual offset of the magnetic flux can be realized, and the loss of the magnetic core is reduced.

[0030] In summary, the application can effectively improve the power density and transmission efficiency of the switching power supply. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of a series connection scheme of an inductor and a transformer;

[0032] Figure 2 It is a top view of a first transformer and inductor magnetic integration structure in the first embodiment of the application;

[0033] Figure 3 It is Figure 2 The corresponding magnetic integration structure is an exploded view;

[0034] Figure 4 It is Figure 2 The corresponding magnetic integration structure is a top view containing a primary winding;

[0035] Figure 5 It is Figure 2 The corresponding magnetic integration structure is a top view containing a secondary winding;

[0036] Figure 6 It is Figure 3 The corresponding magnetic flux density distribution is a 3D view;

[0037] Figure 7 It is Figure 3 The corresponding magnetic flux density distribution is a 3D view of the lower half of the magnetic core;

[0038] Figure 8 It is Figure 3 The corresponding magnetic flux density distribution is a front view;

[0039] Figure 9 It is a top view of a second transformer and inductor magnetic integration structure in the first embodiment of the application;

[0040] Figure 10 It is a top view of a third transformer and inductor magnetic integration structure in the first embodiment of the application;

[0041] Figure 11 It is Figure 10 The corresponding magnetic integration structure is an exploded view;

[0042] Figure 12 It is Figure 10 The corresponding magnetic integration structure is a top view containing a primary winding;

[0043] Figure 13 for Figure 10 the corresponding magnetic integration structure containing the secondary winding;

[0044] Figure 14 for the fourth transformer and inductor magnetic integration structure in the first embodiment of the present application;

[0045] Figure 15 for the fifth transformer and inductor magnetic integration structure in the first embodiment of the present application;

[0046] Figure 16 for the sixth transformer and inductor magnetic integration structure in the first embodiment of the present application;

[0047] Figure 17 for Figure 16 the corresponding magnetic integration structure;

[0048] Figure 18 for Figure 16 the corresponding magnetic integration structure containing the primary winding;

[0049] Figure 19 for Figure 16 the corresponding magnetic integration structure containing the secondary winding. DETAILED DESCRIPTION

[0050] The utility model / invention and its advantages will be further described in detail below with specific embodiments and the accompanying drawings of the specification. However, the specific embodiments of the utility model / invention are not limited to this.

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0053] In the present application, unless otherwise stated, the orientation words such as "up, down, left, right" and the like are generally directed to the directions shown in the drawings, or the directions of the components themselves in the vertical, perpendicular or gravity aspects; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0054] Figure 1The figure shows a schematic diagram of a series connection scheme of an inductor and a transformer, the transformer and the inductor are connected in series, in a traditional design, the transformer and the inductor need to be designed separately, thus two independent magnetic cores are needed. The transformer and inductor magnetic integrated structure provided in the present application integrates the inductor and the transformer in the same magnetic core.

[0055] First embodiment

[0056] The present embodiment provides a transformer and inductor magnetic integrated structure, which comprises:

[0057] At least one module, each module comprising:

[0058] A plurality of transformer columns, the number of which is greater than or equal to 2;

[0059] A plurality of inductor columns, the number of which is greater than or equal to 1;

[0060] One primary winding, which surrounds all the transformer columns and inductor columns in the module where it is located;

[0061] Secondary windings, the number of which is the same as the number of transformer columns in the module where it is located, and each of which is wound on a transformer column in the module where it is located and then connected in parallel.

[0062] The present embodiment integrates the transformer and the inductor on the same magnetic core, which can reduce the board area and volume of the magnetic core device, improve the power density of the power electronic converter, reduce the manufacturing cost, and eliminate the end termination loss between the traditional discrete inductor and the transformer.

[0063] In the transformer and inductor magnetic integrated structure of the present embodiment, each primary winding surrounds all the columns in the corresponding module, and each secondary winding is connected in parallel on the corresponding transformer column, so that the excitation inductance and series inductance can be adjusted by adjusting the air gap height, cross-sectional area size, and the number of turns of the corresponding primary and secondary windings of each transformer column and inductor column, and the turns ratio of the transformer can also be adjusted conveniently.

[0064] The windings between each module can be connected in parallel or in series, and the secondary windings in each module can have a center tap, and the specific design can be flexibly selected according to the topology of the switching power supply, which is not limited in the present application; the cross section of the transformer column and the inductor column in each module can be circular, oval, rectangular, semicircular, crescent, polygonal, etc., and the specific design is not limited in the present application.

[0065] Preferably, each column in each module is arranged in sequence along a horizontal line.

[0066] Furthermore, each transformer column and each inductor column within each module contains an air gap. The air gap can be opened at any position of the transformer column and the inductor column, and the height of the air gap can be adjusted. Segmented air gaps can also be used.

[0067] Furthermore, the cross-sectional area of ​​the transformer column, the air gap height, and the number of turns of the secondary winding are all equal in each module, which facilitates design and manufacturing.

[0068] Furthermore, the primary windings of adjacent modules are wound in opposite directions, and the secondary windings are wound in opposite directions, thereby generating magnetic fluxes in opposite directions within the magnetic pillars of adjacent modules. This allows the magnetic fluxes to cancel each other out, reducing core losses.

[0069] Furthermore, the transformer and inductor magnetic integrated structure also includes: x side posts, where x is a natural number greater than or equal to 2; a top cover; and a bottom cover. The positions of the x side posts, the top cover, and the bottom cover are arranged such that the main magnetic flux of each central post in each module forms a closed magnetic circuit through the x side posts, the top cover, and the bottom cover. The purpose of setting the side posts is to reduce the thickness of the top cover and the bottom cover. The cross-section of the side posts can be various shapes such as circular, elliptical, rectangular, semi-circular, crescent-shaped, and polygonal. The present invention does not limit the specific design.

[0070] Furthermore, each side post is connected to the top cover and the bottom cover at both ends, and there is no air gap.

[0071] Preferably, x is 2.

[0072] Preferably, the primary windings of each module are connected in series with each other, and the secondary windings are connected in series with each other.

[0073] Figure 2 This is a top view of the first transformer and inductor magnetic integrated structure in the first embodiment of the present invention. Figure 3 for Figure 2 Exploded view of the corresponding magnetic integrated structure Figure 4 for Figure 2 The corresponding magnetic integrated structure includes a top view of the primary winding. Figure 5 for Figure 2 The top view of the corresponding magnetic integrated structure including the secondary winding.

[0074] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the integrated structure of transformer and inductor includes: two side posts 101 and 102, one module 106, a top cover 107 and a bottom cover 108; the module 106 includes: two transformer center posts 103 and 105 and an inductor center post 104, and the three center posts in the module are arranged in sequence along a horizontal line.

[0075] likeFigure 3 、 Figure 4 and Figure 5 , wherein the primary winding is wound around three center columns in the module, and the current flowing into the primary winding is i p ; two sets of secondary windings are wound on two transformer center columns and connected in parallel: the current flowing into the secondary winding 1 is i s1 , and the secondary winding 1 is wound on the transformer center column 103; the current flowing into the secondary winding 2 is i s2 , and the secondary winding 2 is wound on the transformer center column 105.

[0076] As can be seen from Figure 3 、 Figure 4 and Figure 5 , the primary winding is wound around three center columns in the module, and the secondary winding is wound only on two transformer center columns; therefore, the excitation inductance L m and the series inductance L k can be adjusted by adjusting the air gap height, the cross-sectional area and the corresponding number of turns of each transformer center column and inductor center column; at the same time, the turns ratio of the transformer can also be conveniently adjusted.

[0077] Figure 6 is a 3D diagram of the magnetic flux density distribution corresponding to Figure 3 , Figure 7 is a 3D diagram of the lower half of the magnetic core magnetic flux density distribution corresponding to Figure 3 , Figure 8 is a front view of the magnetic flux density distribution corresponding to Figure 3 , wherein B is the magnetic flux density, the unit is mTesla, different colors correspond to different magnetic flux densities, and the range is 0.047mTesla~80mTesla. As can be seen from Figure 6 、 Figure 7 and Figure 8 , the colors of the entire magnetic core are relatively uniform, so the magnetic flux density distribution of the entire magnetic core is relatively uniform, thereby effectively reducing the loss of the magnetic core.

[0078] Figure 9 is a top view of the second transformer and inductor magnetic integrated structure in the first embodiment of the application, Figure 9 and Figure 2 , the difference is that the magnetic integrated structure is obtained by adding an additional magnetic column 109 to the first transformer and inductor magnetic integrated structure; the magnetic column 109 connects the top cover and the bottom cover and has no air gap, and its effect is similar to that of the side column, which can share the magnetic flux of the two side columns, thereby reducing the thickness of the side column and improving the power density of the power electronic converter.

[0079] Figure 10 This is a top view of the third type of transformer and inductor magnetic integrated structure in the first embodiment of the present invention. Figure 10 As shown, the integrated transformer and inductor structure includes: two side posts 201 and 202, two modules 203 and 204, and a top cover 212 and a bottom cover 211; Module 1 includes: two transformer center posts 205 and 207 and an inductor center post 206, with the three center posts in Module 1 arranged sequentially along a horizontal line; Module 2 includes two transformer center posts 208 and 210 and an inductor center post 209, with the three center posts in Module 2 arranged sequentially along a horizontal line, and the two modules are also arranged sequentially along a horizontal line.

[0080] like Figure 11 for Figure 10 Exploded view of the corresponding magnetic integrated structure; Figure 12 for Figure 10 A top view of the corresponding magnetic integrated structure, including the primary winding; Figure 13 for Figure 10 The corresponding top view of the magnetic integrated structure, including the secondary winding. For example... Figure 11 , Figure 12 , Figure 13 As shown, within module 1, the primary winding 1 surrounds the three center columns within module 1, and the current flowing into the primary winding 1 is... i p1 The two secondary windings are wound in parallel on the two transformer intermediate columns, with the current flowing into secondary winding 1 being... i s11 It is wound on the transformer's center column 205; the current flowing into the secondary winding 2 is i s2 The primary winding 2 is wound around the three intermediate columns of the transformer 207; similarly, within module 2, the primary winding 2 wraps around the three intermediate columns within module 2, and the current flowing into the primary winding 2 is... i p2 The two secondary windings are wound in parallel on the two transformer intermediate columns, with the current flowing into secondary winding 3 being... i s21 It is wound on the transformer's central column 208; the current flowing into the secondary winding 4 is i s22, the winding of module 1 and module 2 are wound in opposite directions, and the magnetic fluxes in the magnetic columns of the two modules are opposite, so that the magnetic fluxes can be offset, and the loss of the magnetic core is reduced. In addition, the windings of module 1 and module 2 can be connected in series or in parallel, and the winding loss can be further reduced. Specifically, when the primary winding of module 1 and the primary winding of module 2 are connected in series, the secondary winding of module 1 and the secondary winding of module 2 are also connected in series; when the primary winding of module 1 and the primary winding of module 2 are connected in parallel, the secondary winding of module 1 and the secondary winding of module 2 are also connected in parallel; in actual application, the commonly used connection mode is that the primary winding of module 1 and the primary winding of module 2 are connected in series, and the secondary winding of module 1 and the secondary winding of module 2 are connected in series.

[0081] From Figure 11 、 Figure 12 、 Figure 13 It can be seen that in each module, the primary winding surrounds the three middle columns in the module, and the secondary winding is wound on only two transformer columns; therefore, the size of the excitation inductance Lm can be adjusted by adjusting the air gap height, the cross-sectional area, and the corresponding number of turns of the windings of the transformer middle columns and the inductor middle columns; at the same time, the turns ratio of the transformer can also be conveniently adjusted. L m and the size of the series inductance Ls. L k

[0082] Figure 14 is a top view of a fourth transformer and inductor magnetic integrated structure in the first embodiment of the present application, Figure 14 and Figure 10 the difference lies in that two new modules are added, and the four modules of the magnetic integrated structure are numbered as 213, 214, 215, and 216. As shown in Figure 14 , the windings of adjacent modules are wound in opposite directions, and the magnetic fluxes in the magnetic columns of the adjacent modules are opposite, so that the magnetic fluxes can be offset, and the loss of the magnetic core is reduced. In addition, the windings of each module can be connected in series or in parallel, and the winding loss can be further reduced.

[0083] Figure 15 is a top view of a fifth transformer and inductor magnetic integrated structure in the first embodiment of the present application, Figure 15 and Figure 10 the difference lies in that two new magnetic columns 219 and 220 are added. The two magnetic columns 219 and 220 are connected to the top cover and the bottom cover, and have no air gap, and their effect is similar to that of the side columns, which can share the magnetic flux of the two side columns, and thus the thickness of the side columns can be reduced, and the power density of the power electronic converter is improved.

[0084] Figure 16 is a top view of a sixth transformer and inductor magnetic integrated structure in the first embodiment of the present application. As​Figure 16 The transformer and inductor magnetic integration structure shown in the figure comprises two side columns 201 and 202, a plurality of modules, and a top cover 212 and a bottom cover 211. Between the module 303 and the module 304, n similar modules can be inserted, each module containing two transformer middle columns and one inductor middle column, and the three middle columns are arranged in sequence along a horizontal line, and the modules are also arranged in sequence along a horizontal line.

[0085] Figure 17 For Figure 16 The exploded view of the corresponding magnetic integration structure; Figure 18 For Figure 16 The top view of the corresponding magnetic integration structure containing the primary winding; Figure 19 For Figure 16 The top view of the corresponding magnetic integration structure containing the secondary winding. As Figure 17 , Figure 18 , Figure 19 shown, in each module, the primary winding will be wound around the three middle columns in the corresponding module; two secondary windings are wound on the two transformer middle columns and connected in parallel. In addition, the winding directions of the windings in adjacent two modules are opposite, thereby generating magnetic fluxes with opposite directions in the magnetic columns of the adjacent two modules, which can realize mutual cancellation of the magnetic fluxes and reduce the loss of the magnetic core. In addition, the windings of each module can need to be flexibly connected in series or parallel.

[0086] From Figure 17 , Figure 18 , Figure 19 It can be seen that in each module, the primary winding will be wound around the three middle columns in the module, and the secondary winding will be wound only on the two transformer middle columns; therefore, the excitation inductance L m and the size of the series inductance L k can be adjusted by adjusting the air gap height, cross-sectional area size, and corresponding winding turns of each transformer middle column and inductor middle column; at the same time, the turns ratio of the transformer can also be conveniently adjusted.

[0087] Second embodiment

[0088] The embodiment disclosed is a switching power supply, which comprises any one of the transformer and inductor magnetic integration structures in the first embodiment.

[0089] The switching power supply of the embodiment comprises any one of the transformer and inductor magnetic integration structures in the first embodiment, which is beneficial to reduce the board space occupied by the magnetic components, improve the working efficiency of the magnetic components, and thus effectively improve the power density and transmission efficiency of the switching power supply.

[0090] It is apparent that the application can be carried out by other embodiments that will be readily apparent to those skilled in the art and are encompassed within the spirit and scope of the application. Therefore, all alternatives and equivalents are intended to be encompassed within the scope of the application.

Claims

1. A transformer and inductor magnetic integrated structure, characterized by, Comprise: 2 or more modules, each module comprising: a plurality of transformer columns, the number of which is greater than or equal to 2; a plurality of inductor columns, the number of which is greater than or equal to 1; 1 primary winding, which surrounds all the transformer columns and inductor columns in the module in which it is located; a secondary winding, which is the same number as the transformer columns in the module in which it is located, and is wound on each transformer column in the module in which it is located, and then connected in parallel; Each transformer column and each inductor column in each module contains an air gap; the winding direction of the primary winding of adjacent modules is opposite, and the winding direction of the secondary winding of adjacent modules is opposite, thereby generating magnetic flux in the magnetic columns of adjacent modules in opposite directions.

2. The transformer and inductor magnetic integration structure of claim 1, wherein: Each column in each module is arranged in sequence along a horizontal line.

3. The transformer and inductor magnetic integration structure of claim 1, wherein: The cross-sectional area, air gap height, and number of turns of the secondary winding of each transformer column in each module are equal.

4. The transformer and inductor magnetic integration structure of claim 1, wherein, The transformer and inductor magnetic integrated structure further comprises: x edge columns, where x is a natural number greater than or equal to 2; a top cover; a bottom cover; Wherein the position of the x edge columns, the top cover and the bottom cover can make the main magnetic flux of each column in each module form a closed magnetic circuit through the x edge columns, the top cover and the bottom cover.

5. The transformer and inductor magnetic integration structure of claim 4, wherein: Each edge column is connected to the top cover and the bottom cover at both ends, and there is no air gap.

6. The transformer and inductor magnetic integrated structure of claim 4, wherein: The x is 2.

7. The transformer and inductor magnetic integrated structure of claim 1, wherein: The primary windings of adjacent modules are connected in series, and the secondary windings are connected in series.

8. A switching power supply characterized by comprising: Comprise the transformer and inductor magnetic integrated structure of any one of claims 1 to 7.

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