Magnetic integrated transformer, common mode noise adjustment method and power supply thereof

Abstract

The present invention provides a magnetic integrated transformer, a common-mode noise adjustment method therefor, and a power supply. The magnetic core of the magnetic integrated transformer includes a central magnetic column, first, second, third, and fourth magnetic columns, and first and second windings. The first winding is wound around the central magnetic column and the third magnetic column, and the second winding is wound around the central magnetic column and the fourth magnetic column. There is no gap between the first and second magnetic columns and the first magnetic yoke, while there is a gap between the central, third, and fourth magnetic columns and the first magnetic yoke. The three gaps correspond to three magnetic resistances in an equivalent magnetic circuit, thereby integrating three inductors. The magnetic fluxes of the three inductors do not affect each other, resulting in a compact structure, small size, low loss, and high stability. When the total magnetic fluxes of the first and second windings are equal, and the first and second windings are planar coils, the present invention adjusts the common-mode noise by adjusting the structural capacitance between the first and second windings, thereby suppressing or even eliminating the common-mode noise.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a magnetic integrated transformer, a common-mode noise regulation method thereof, and a power supply. Background Art

[0002] With the continuous development of power electronic converter technology, increasing switching frequency and improving power density has become a trend. Inductors and transformers are essential magnetic components in power electronic converters. To increase power density, inductors and transformers are integrated into the core of planar magnetic components, creating magnetically integrated transformers. How to integrate inductors and transformers to achieve a compact structure, thereby reducing system size and losses, has long been a research topic in transformer design. Summary of the Invention

[0003] In view of the above technical status, the present invention provides a magnetic integrated transformer, which can integrate three inductors in the transformer, has a compact structure, small size, low loss, and the three inductors do not affect each other, and have high stability.

[0004] The technical solution of the present invention is: a magnetic integrated transformer, including a magnetic core and a coil winding, wherein the magnetic core includes a first magnetic yoke, a second magnetic yoke, a central magnetic column, a first magnetic column, and a second magnetic column; the first magnetic yoke and the second magnetic yoke are arranged opposite to each other; the central magnetic column, the first magnetic column, and the second magnetic column are arranged between the first magnetic yoke and the second magnetic yoke;; the transformer is characterized by:

[0005] A third magnetic column and a fourth magnetic column are further provided between the first magnetic yoke and the second magnetic yoke;

[0006] One end of the first magnetic column is connected to the second magnetic yoke (ie, there is no gap between the first magnetic column and the second magnetic yoke), and the other end is connected to the first magnetic yoke (ie, there is no gap between the first magnetic yoke and the first magnetic yoke);

[0007] One end of the second magnetic column is connected to the second magnetic yoke (ie, there is no gap between the second magnetic yoke and the second magnetic yoke), and the other end is connected to the first magnetic yoke (ie, there is no gap between the first magnetic yoke and the second magnetic yoke);

[0008] One end of the central magnetic column is connected to the second magnetic yoke (ie, there is no gap between the central magnetic column and the second magnetic yoke), and there is a first gap between the other end and the first magnetic yoke, the length of which is recorded as l T (That is, the distance between the other end of the central magnetic column and the first magnetic yoke is l T ); The area of the other end of the central magnetic column facing the first magnetic yoke is recorded as A T ;

[0009] One end of the third magnetic column is connected to the second magnetic yoke (ie, there is no gap between the third magnetic column and the second magnetic yoke), and there is a second gap between the other end and the first magnetic yoke, the length of which is recorded as l L(ie, the distance between the other end of the third magnetic column and the first magnetic yoke is l L ); The area of the other end of the third magnetic column facing the first magnetic yoke is recorded as A L ;

[0010] One end of the fourth magnetic column is connected to the second magnetic yoke (ie, there is no gap between the second magnetic yoke), and there is a third gap between the other end and the first magnetic yoke, the length of which is recorded as l R (ie, the distance between the other end of the fourth magnetic column and the first magnetic yoke is l R ); The area of the other end of the fourth magnetic column facing the first magnetic yoke is recorded as A R ;

[0011] The coil winding includes a first winding and a second winding; the first winding is formed around the central magnetic column and the third magnetic column; the second winding is formed around the central magnetic column and the fourth magnetic column.

[0012] The first magnetic yoke structure is not limited and can be a planar structure or a curved structure. When a planar structure is selected, its cross section includes but is not limited to a rectangle, a circle, etc.

[0013] The second magnetic yoke structure is not limited and can be a planar structure or a curved structure. When a planar structure is selected, its cross section includes but is not limited to a rectangle, a circle, etc.

[0014] The first magnetic column has a columnar structure, and its cross-sectional structure is not limited, including rectangular, circular, polygonal with arcs, etc.

[0015] The second magnetic column has a columnar structure, and its cross-sectional structure is not limited, including rectangular, circular, polygonal with arcs, etc.

[0016] The central magnetic column has a columnar structure, and its cross-sectional structure is not limited, including rectangular, circular, polygonal with arcs, etc.

[0017] The third magnetic column has a columnar structure, and its cross-sectional structure is not limited, including rectangular, circular, polygonal with arcs, etc.

[0018] The fourth magnetic column has a columnar structure, and its cross-sectional structure is not limited, including a rectangle, a circle, a polygon with an arc, etc.

[0019] The specific arrangement positions of the first magnetic column, the second magnetic column, the third magnetic column and the fourth magnetic column are not limited. For example, the first magnetic column, the second magnetic column, the third magnetic column and the fourth magnetic column form a one-dimensional arrangement or a planar arrangement.

[0020] Preferably, the first winding is a planar winding with any number of winding layers, including 4, 6, 8 or more layers. The planar winding layer material is not limited, including FR4 glass fiber board, paper substrate, ceramic substrate, flexible board, etc.

[0021] Preferably, the second winding is a planar winding with any number of winding layers, including 4, 6, 8 or more layers. The planar winding layer material is not limited, including FR4 glass fiber board, paper substrate, ceramic substrate, flexible board, etc.

[0022] Preferably, the single-layer structure of the first winding is the same as the single-layer structure of the second winding.

[0023] As an implementation method, the central magnetic column, the first magnetic column, the second magnetic column, the third magnetic column and the fourth magnetic column form an integrated structure with the second magnetic yoke, and the first magnetic yoke cover is placed on the integrated structure, so that the first magnetic column and the second magnetic column are attached to the first magnetic yoke, and there is no gap between them and the first magnetic yoke, while there are gaps between the central magnetic column, the third magnetic column, the fourth magnetic column and the first magnetic yoke respectively, thereby forming the planar magnetic integrated transformer of the present invention.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The magnetic core of the present invention includes not only the central magnetic column, the first magnetic column and the second magnetic column, but also the third magnetic column and the second magnetic column, and there is no gap between the first magnetic column, the second magnetic column and the first magnetic yoke, so that the upper magnetic surface, the first magnetic column, the second magnetic yoke and the second magnetic column form a closed magnetic circuit, that is, the magnetic resistance on the magnetic circuit is zero, and a certain length of gap is retained between the central magnetic column, the third magnetic column and the fourth magnetic column and the first magnetic yoke, thereby introducing three gaps in the magnetic core. These three gaps correspond to the three magnetic resistances in the equivalent magnetic circuit, that is, the first gap corresponds to the equivalent magnetic resistance R T , the second gap corresponds to the equivalent magnetic resistance R L , the second gap corresponds to the equivalent magnetic resistance R R , realizing the integration of three inductors, such as Figure 1 When the ratio of the number of turns of the first winding to the number of turns of the second winding is n:1:1, the equivalent circuit is as follows Figure 2 shown.

[0026] (2) In the present invention, since there is no gap between the first magnetic column and the second magnetic column and the upper magnetic surface, the magnetic resistance in the formed magnetic circuit is zero, thereby achieving decoupling of the magnetic flux of the three integrated inductors and ensuring that their magnetic fluxes do not affect each other, that is, the sizes of the three inductors do not affect each other.

[0027] Therefore, the present invention realizes a planar magnetic integrated transformer integrating three inductors, wherein the three inductors and the transformer share a magnetic core structure, reducing the system volume. Moreover, since there are only two sets of coils, the first winding and the second winding of the transformer, redundant coils are eliminated, achieving smaller losses and a more compact structure. In addition, the three inductors are decoupled and integrated, the inductance sizes do not affect each other, and the stability is high.

[0028] Based on the equivalent magnetic circuit and the corresponding equivalent circuit of the magnetic integrated transformer of the present invention, the relationship between the gap length and the corresponding integrated inductor is quantitatively established. The specific relationship is shown in the following formula (1):

[0029]

[0030] Among them L T 、L L and L R They are the inductance values of the three integrated inductors, N p is the number of turns of the first winding, N s is the number of turns of the second winding. From formula (1), it is found that the inductance of the three integrated inductors is proportional to the number of turns N of the winding. p 、N s 、R L 、R T 、R R related.

[0031]

[0032] Where μ0 is the magnetic permeability of air. p =N s When the magnetic resistance R T 、R L With R R The size of the integrated inductor can be flexibly adjusted.

[0033] When A T 、A L 、A R When the magnetic resistance R T 、R L With R R The size of the first gap length l T , the second gap length l L , the third gap length l R Therefore, the first gap length l can be adjusted T , the second gap length l L , the third gap length l R to achieve the desired inductance value.

[0034] When l L / A L =l R / A R When R L =R R , the equivalent magnetic circuit is as follows Figure 3 As shown. At this time, as a preference, A L =A R , l L =l RAs a preferred structural implementation, the structure of the third magnetic column is equal to that of the fourth magnetic column. As a further preferred embodiment, the third magnetic column and the fourth magnetic column are symmetrical with the central magnetic column as the axis.

[0035] Under high switching frequency, the common mode noise performance of the transformer is easily deteriorated. In order to suppress common mode noise and optimize high frequency performance of the magnetic integrated transformer of the present invention, the inventors further studied the common mode current between the first winding and the second winding.

[0036] The magnetic flux of the first winding Φ p Equal to the sum of the magnetic flux Φ1 of the central magnetic column and the magnetic flux of the third magnetic column, the magnetic flux of the second winding Φ s is equal to the sum of the magnetic flux Φ1 of the central magnetic column and the magnetic flux of the fourth magnetic column, that is, the calculation expression of the magnetic flux of the first winding and the second winding is as follows (3):

[0037]

[0038] Among them, I p is the current of the first winding, I s is the current of the second winding.

[0039] Therefore, when The total magnetic flux of the first winding and the second winding is equal. At this time, according to the law of electromagnetic induction, equal magnetic flux means that the voltage per turn of the first winding and the second winding is equal. When the first winding and the second winding are single-turn coils and have a planar structure, for example, the first winding ab and the second winding cd are as follows: Figure 4 Figure (a) shows a single-turn planar winding, and its voltage distribution is shown in Figure (b) of Figure 4. Since the voltage is linearly distributed and the voltages of the two coils are equal, the expression of the common-mode current between the two coils can be simplified to the following formula (4):

[0040]

[0041] Among them, v a 、v b is the voltage at the first winding terminal, v c 、v d is the second winding terminal voltage, It is related to the external circuit. If the external circuit is fixed, its value is fixed. C structure is the structural capacitance between the first winding ab and the second winding cd, It is determined by the distance h between the two coil windings and the area facing each other, w is the width of the coil winding, l is the circumference of the coil winding, wl is the area of the coil winding, ε0 is the vacuum dielectric constant, ε r is the dielectric constant of the material between the coil windings.

[0042] As can be seen from equation (4), adjusting the structural capacitance between the first winding ab and the second winding cd can adjust the common-mode current, thereby adjusting the common-mode noise of the magnetic integrated transformer. For planar coil windings, when the area facing each other is constant, adjusting the structural capacitance can be achieved by adjusting the distance between the coils. That is, by adjusting the distance h between the first winding ab and the second winding cd, the common-mode noise current between the transformer's single-turn coils can be adjusted.

[0043] The above formula (4) can be extended to the case of multi-turn coils. Taking the common application scenario LLC converter as an example, when the number of first winding layers is 2 and the number of second winding layers is 4, the specific winding distribution is as follows: Figure 5 As shown. At this time, the rate of change of the terminal voltage is as follows (5):

[0044]

[0045] The total common-mode current is as follows (6):

[0046]

[0047] From the above formula (6), we can see that by adjusting 2C P1S3 +3C P1S4 -C P2S1 The value of can adjust the common mode current between the coils, thereby adjusting the common mode noise of the magnetic integrated transformer and reducing 2C P1S3 +3C P1S4 -C P2S1 The value of can improve the common mode noise suppression capability of the magnetic integrated transformer, even when 2C P1S3 +3C P1S4 -C P2S1 A value of zero eliminates common-mode noise.

[0048] When the number of layers of the first winding is 4 and the number of layers of the second winding is 4, the specific winding distribution is as follows Figure 6 As shown. At this time, the rate of change of the terminal voltage is as follows (7):

[0049]

[0050] The total common-mode current is as follows (8):

[0051]

[0052] That is, the common-mode current can be adjusted by adjusting the structural capacitance between different layers of the first winding and the second winding. For planar coil windings, adjusting the structural capacitance between different layers can be achieved by adjusting the distance between different layers of coil windings. That is, by adjusting the distance between different layers of the first winding and the second winding, the common-mode noise of the transformer can be adjusted, thereby suppressing or even eliminating the common-mode noise.

[0053] Therefore, the magnetically integrated transformer of the present invention can adjust common-mode noise by adjusting the structural capacitance between the first and second windings. Reducing the structural capacitance between the first and second windings can suppress or even eliminate common-mode noise. When the first and second windings are single-layer planar coils, the facing area between the coil windings is constant, and the structural capacitance can be adjusted by reducing the distance between the first and second windings. When the first and second windings are multi-layer planar coils, the structural capacitance can be adjusted by adjusting the distance between the different layers. This adjustment method is simple and easy to implement, can significantly suppress common-mode noise, and endows the magnetically integrated transformer of the present invention with excellent high-frequency characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the equivalent magnetic circuit of the magnetic integrated transformer of the present invention.

[0055] Figure 2 This is a schematic diagram of an equivalent circuit of the magnetic integrated transformer of the present invention when the ratio of the number of turns of the first winding to the number of turns of the second winding is n:1:1.

[0056] Figure 3 The magnetic integrated transformer of the present invention is L / A L =l R / A R Schematic diagram of the equivalent magnetic circuit when .

[0057] Figure 4 Figure (a) is a structural schematic diagram of the first winding and the second winding in the magnetic integrated transformer of the present invention when they are planar single-turn coils, and Figure (b) is its voltage distribution diagram.

[0058] Figure 5 It is a schematic diagram of a winding structure and a corresponding equivalent circuit structure diagram when the first winding in the magnetic integrated transformer of the present invention is a two-layer planar structure and the second winding is a four-layer planar structure.

[0059] Figure 6 It is a winding structure diagram and a corresponding equivalent circuit structure diagram when the first winding in the magnetic integrated transformer of the present invention is a 4-layer planar structure and the second winding is a 4-layer planar structure.

[0060] Figure 7It is a schematic diagram of the exploded structure of the magnetic integrated transformer according to Example 1 of the present invention.

[0061] Figure 8 yes Figure 7 A top view of the second magnetic yoke, the central magnetic column, the first magnetic column, the second magnetic column, the third magnetic column, and the fourth magnetic column.

[0062] Figure 9 yes Figure 7 Front view of the second magnetic yoke, central magnetic column, first magnetic column, second magnetic column, third magnetic column, and fourth magnetic column.

[0063] Figure 10 yes Figure 7 Front view of the second magnetic yoke, central magnetic column, first magnetic column, second magnetic column, third magnetic column, fourth magnetic column and first magnetic yoke.

[0064] Figure 11 yes Figure 7 Rear view of the second magnetic yoke, central magnetic column, first magnetic column, second magnetic column, third magnetic column, fourth magnetic column, and first magnetic yoke.

[0065] Figure 12 yes Figure 7 Schematic diagram of the third magnetic column, the fourth magnetic column, the central magnetic column and the first magnetic yoke facing each other.

[0066] Figure 13 yes Figure 7 A top view of the second magnetic yoke, the central magnetic column, the first magnetic column, the second magnetic column, the third magnetic column, the fourth magnetic column, the first winding, and the second winding.

[0067] Figure 14 yes Figure 7 Schematic diagram of the second magnetic yoke, central magnetic column, first magnetic column, second magnetic column, third magnetic column, fourth magnetic column and first winding.

[0068] Figure 15 yes Figure 7 Schematic diagram of the second magnetic yoke, central magnetic column, first magnetic column, second magnetic column, third magnetic column, fourth magnetic column and second winding.

[0069] Figure 7-15 The reference numerals in the figure are: first magnetic yoke 1, second magnetic yoke 2, central magnetic column 3, first magnetic column 4, second magnetic column 5, third magnetic column 6, fourth magnetic column 7, first winding 8, second winding 9, first gap 10, second gap 11, and third gap 12. DETAILED DESCRIPTION

[0070] The present invention will be further described in detail below in conjunction with the embodiments and drawings. It should be noted that the embodiments described below are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0071] Example 1:

[0072] In this embodiment, Figure 7-15 As shown, the magnetic integrated transformer includes a magnetic core and a coil winding. The magnetic core includes a first magnetic yoke 1, a second magnetic yoke 2, a central magnetic column 3, a first magnetic column 4, a second magnetic column 5, a third magnetic column 6 and a fourth magnetic column 7.

[0073] The first magnetic yoke 1 and the second magnetic yoke 2 are arranged opposite to each other; the central magnetic column 3 , the first magnetic column 4 and the second magnetic column 5 are arranged between the first magnetic yoke 1 and the second magnetic yoke 2 .

[0074] In this embodiment, the first magnetic pillar 4 and the second magnetic pillar 5 are located on the left and right sides of the central magnetic pillar 3 , and the third magnetic pillar 6 and the fourth magnetic pillar 7 are located on the front and back sides of the central magnetic pillar 3 .

[0075] One end of the first magnetic column 4 is connected to the second magnetic yoke 2 , and the other end is connected to the first magnetic yoke 1 , that is, there is no gap between the first magnetic column 4 and the first magnetic yoke 1 or the second magnetic yoke 2 .

[0076] One end of the second magnetic column 5 is connected to the second magnetic yoke 2 , and the other end is connected to the first magnetic yoke 1 , that is, there is no gap between the second magnetic column 5 and the first magnetic yoke 1 or the second magnetic yoke 2 .

[0077] like Figure 10 As shown, one end of the central magnetic column 3 is connected to the second magnetic yoke 2, and there is a first gap 10 between the other end and the first magnetic yoke 1, the length of which is recorded as l T , that is, the distance between the other end of the central magnetic column 3 and the bottom surface of the first magnetic yoke 1 is the first gap length l T .like Figure 12 As shown, the area between the other end of the central magnetic column 3 and the first magnetic yoke 1 is recorded as A T .

[0078] like Figure 10 As shown, one end of the third magnetic column 6 is connected to the second magnetic yoke 2, and there is a second gap 11 between the other end and the first magnetic yoke 1, the length of which is recorded as l L , that is, the distance between the other end of the third magnetic column 6 and the bottom surface of the first magnetic yoke 1 is the second gap length l L .like Figure 12 As shown, the area of the other end of the third magnetic column 6 facing the first magnetic yoke 1 is recorded as A L .

[0079] like Figure 11 As shown, one end of the fourth magnetic column 7 is connected to the second magnetic yoke 2, and there is a third gap 12 between the other end and the first magnetic yoke 1, the length of which is recorded as l R, that is, the distance between the other end of the fourth magnetic column 7 and the bottom surface of the first magnetic yoke 1 is the third gap length l R .like Figure 12 As shown, the area of the other end of the fourth magnetic column 7 facing the first magnetic yoke 1 is recorded as A R .

[0080] The coil winding includes a first winding 8 and a second winding 9. Figure 13 、 14 As shown, the first winding 8 forms a winding around the central magnetic column 3 and the third magnetic column 6. Figure 13 、 15 As shown, the second winding 9 forms a winding around the central magnetic column 3 and the fourth magnetic column 7 .

[0081] In this embodiment, the first magnetic yoke 1 is a planar structure with a rectangular cross section, and the second magnetic yoke 2 is a planar structure with a rectangular cross section.

[0082] In this embodiment, the first magnetic column 4 has a columnar structure with a rectangular cross section, and the second magnetic column 5 has a columnar structure with a rectangular cross section.

[0083] In this embodiment, the central magnetic column 3 has a columnar structure and a circular cross section.

[0084] In this embodiment, the third magnetic column 6 and the fourth magnetic column 7 have the same structure, both of which are columnar structures with rectangular cross sections. L =A R , l L =l R .

[0085] In this embodiment, the second magnetic yoke 2, the central magnetic column 3, the first magnetic column 4, the second magnetic column 5, the third magnetic column 6 and the fourth magnetic column 7 form an integrated structure. The first magnetic yoke 1 cover is placed on top of the integrated structure, so that the first magnetic column 4 and the second magnetic column 5 are in contact with the first magnetic yoke 1 without any gap between them, while there are gaps between the central magnetic column 3, the third magnetic column 6, the fourth magnetic column 7 and the first magnetic yoke 1.

[0086] In the magnetic integrated transformer, there is no gap between the first magnetic column 4, the second magnetic column 5 and the first magnetic yoke 1, so that the first magnetic yoke 1, the first magnetic column 4, the second magnetic yoke 2 and the second magnetic column 5 form a closed magnetic circuit, and the magnetic resistance on the magnetic circuit is zero. A certain length of gap is retained between the central magnetic column 3, the third magnetic column 6 and the fourth magnetic column 7 and the first magnetic yoke 1, respectively, thereby introducing three gaps in the magnetic core. These three gaps correspond to the three magnetic resistances in the equivalent magnetic circuit, that is, the first gap corresponds to the magnetic resistance R T , the second gap corresponds to the magnetic resistance R L , the second gap corresponds to the magnetic resistance R R , realizing the integration of three inductors, such as Figure 1 、3 As shown, when the ratio of the number of turns of the first winding to the number of turns of the second winding is n:1:1, the equivalent circuit is as follows Figure 2 Furthermore, since there is no gap between the first magnetic column 4 and the second magnetic column 5 and the first magnetic yoke 1, the magnetic resistance in the formed magnetic circuit is zero, thereby decoupling the magnetic flux of the three integrated inductors and ensuring that their magnetic fluxes do not affect each other, that is, the sizes of the three inductors do not affect each other.

[0087] In this embodiment, the first winding 8 is a planar single-turn winding, and the winding material is FR4 glass fiber board. The second winding 9 is a planar single-turn winding, and the winding material is FR4 glass fiber board, that is, N p =N s . Due to A L =A R , l L =l R ,according to By adjusting the first gap length l T , the second gap length l L , the third gap length l R The desired inductance value can be achieved.

[0088] In this embodiment, the calculation expressions of the magnetic flux of the first winding and the second winding are as follows:

[0089]

[0090] because The total magnetic flux of the first winding and the second winding is equal. The common-mode current between the first winding and the second winding of the magnetic integrated transformer can be simplified as:

[0091]

[0092] Among them, v a 、v b is the voltage at the first winding terminal, v c and v d is the voltage at the second winding terminal, C structure is the structural capacitance between the first and second windings and is determined by the distance h between the two coil windings and the area facing each other, w is the width of the winding, l is the circumference of the winding, wl is the area of the winding, ε0 is the dielectric constant of vacuum, ε r is the dielectric constant of the material between the windings.

[0093] In this embodiment, the facing area of the two coil windings is fixed. The common-mode noise of the transformer can be adjusted by adjusting the distance between the first winding and the second winding. Reducing the distance can improve the common-mode noise suppression capability, and even when the distance is zero, the common-mode noise can be eliminated.

[0094] Example 2:

[0095] In this embodiment, the structure of the magnetic integrated transformer is basically the same as that of the magnetic integrated transformer in Example 1, except that the number of layers of the first winding is 2 and the number of layers of the second winding is 4. The specific winding distribution is as follows: Figure 14 As shown, the expression of the common-mode current between the first winding and the second winding is as follows:

[0096]

[0097] In this embodiment, the facing areas between the P1S3 layers, the P1S4 layers, and the P2S1 layers are constant. By adjusting the distances between the P1S3 layers, the P1S4 layers, and the P2S1 layers of the first winding and the second winding, the common mode noise can be adjusted. P1S3 +3C P1S4 -C P2S1 The value of 2C is reduced, which can improve the common mode noise suppression capability of the transformer. P1S3 +3C P1S4 =C P2S1 It can eliminate common mode noise.

[0098] Example 3:

[0099] In this embodiment, the structure of the magnetic integrated transformer is basically the same as that of the magnetic integrated transformer in Example 1, except that the number of layers of the first winding is 4 and the number of layers of the second winding is 4. The specific winding distribution is as follows: Figure 15 As shown, the expression of the common-mode current between the first winding and the second winding is as follows:

[0100]

[0101] In this embodiment, the facing areas between the P2S1 layers, the P3S2 layers, the P4S3 layers, and the P1S4 layers are constant. By adjusting the distances between the P2S1 layers, the P3S2 layers, the P4S3 layers, and the P1S4 layers of the first winding ab and the second winding cd, the common mode noise can be adjusted. When C P2S1 +C P3S2 +C P4S3 -3C P1S4 The value of C is reduced, which can improve the common mode noise suppression capability of the transformer. P2S1 +C P3S2 +C P4S3 =3C P1S4 It can eliminate common mode noise.

[0102] Example 4:

[0103] In this embodiment, the structure of the magnetic integrated transformer is basically the same as that of the magnetic integrated transformer in embodiment 1, except that the structures of the third magnetic column 6 and the fourth magnetic column 7 are different. L / A L =l R / A R , so that R L =R R , thus ensuring that the total magnetic flux of the first winding and the second winding is equal, the common-mode current between the first winding and the second winding of the magnetic integrated transformer can be simplified to formula (4). When the facing area of the first winding and the second winding is fixed, the common-mode noise of the transformer can be adjusted by adjusting the distance between the first winding and the second winding. Reducing the distance can improve the common-mode noise suppression capability, and even when the distance is zero, the common-mode noise can be eliminated.

[0104] Example 5:

[0105] In this embodiment, the structure of the magnetically integrated transformer is substantially the same as that of the magnetically integrated transformer in Example 4, except that the third magnetic pillar 6 and the fourth magnetic pillar 7 are not located on the front and rear sides of the central magnetic pillar 3, but can be located elsewhere. For example, the third magnetic pillar 6 can be located on the front left side of the central magnetic pillar 3, and the fourth magnetic pillar 7 can be located on the front right side of the central magnetic pillar 3; alternatively, the third magnetic pillar 6 can be located on the rear left side of the central magnetic pillar 3, and the fourth magnetic pillar 7 can be located on the rear left side of the central magnetic pillar 3, etc.

[0106] The above embodiments provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements or similar substitutions made within the scope of the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic integrated transformer with three decoupled integrated inductors, comprising a magnetic core and coil windings, wherein the magnetic core comprises a first magnetic yoke, a second magnetic yoke, a central magnetic column, a first magnetic column, and a second magnetic column; the first magnetic yoke and the second magnetic yoke are arranged opposite each other; the central magnetic column, the first magnetic column, and the second magnetic column are arranged between the first magnetic yoke and the second magnetic yoke; and wherein: A third magnetic column and a fourth magnetic column are further provided between the first magnetic yoke and the second magnetic yoke; One end of the first magnetic column is connected to the second magnetic yoke, and the other end is connected to the first magnetic yoke; One end of the second magnetic column is connected to the second magnetic yoke, and the other end is connected to the first magnetic yoke; One end of the central magnetic column is connected to the second magnetic yoke, and a first gap exists between the other end and the first magnetic yoke; One end of the third magnetic column is connected to the second magnetic yoke, and a second gap exists between the other end of the third magnetic column and the first magnetic yoke; One end of the fourth magnetic column is connected to the second magnetic yoke, and a third gap exists between the other end of the fourth magnetic column and the first magnetic yoke; The coil winding includes a first winding and a second winding; the first winding is wound around the central magnetic column and the third magnetic column; The second winding is wound around the central magnetic column and the fourth magnetic column; The first gap, the second gap and the third gap correspond to the magnetic resistance R in the equivalent magnetic circuit respectively. T 、R L With R R ; The length of the first gap is denoted as l T The area between the other end of the central magnetic column and the first magnetic yoke is recorded as A. T ; The length of the second gap is denoted as l L The area between the other end of the third magnetic column and the first magnetic yoke is recorded as A L ; The length of the fourth magnetic column is denoted as l R The area between the other end of the fourth magnetic column and the first magnetic yoke is recorded as A R .

2. The magnetic integrated transformer according to claim 1, wherein: The first magnetic yoke is a planar structure or a curved structure.

3. The magnetic integrated transformer according to claim 1, wherein: The second magnetic yoke is a planar structure or a curved structure.

4. The magnetic integrated transformer according to claim 1, wherein: The first magnetic column has a columnar structure, and its cross section includes one of a rectangle, a circle, and a polygon with an arc.

5. The magnetic integrated transformer according to claim 1, wherein: The second magnetic column has a columnar structure, and its cross section includes one of a rectangle, a circle, and a polygon with an arc.

6. The magnetic integrated transformer according to claim 1, wherein: The central magnetic column has a columnar structure, and its cross-sectional structure is not limited, including one of a rectangle, a circle, and a polygon with an arc.

7. The magnetic integrated transformer according to claim 1, wherein: The third magnetic column has a columnar structure, and its cross section includes one of a rectangle, a circle, and a polygon with an arc.

8. The magnetic integrated transformer according to claim 1, wherein: The fourth magnetic column has a columnar structure, and its cross section includes one of a rectangle, a circle, and a polygon with an arc.

9. The magnetic integrated transformer according to claim 1, wherein: The central magnetic column, the first magnetic column, the second magnetic column, the third magnetic column, the fourth magnetic column and the second magnetic yoke are integrally formed.

10. The magnetic integrated transformer according to claim 1, wherein: When A T 、A L 、A R When a certain time is reached, by adjusting the first gap length l T , the second gap length l L , the third gap length l R Adjust the inductance value.

11. The magnetic integrated transformer according to claim 10, wherein: l L / A L =l R / A R 。 12. The magnetic integrated transformer according to claim 11, wherein: A L =A R ,l L =l R 。 13. The magnetic integrated transformer according to claim 12, wherein: The structure of the third magnetic column is equal to that of the fourth magnetic column.

14. The magnetic integrated transformer according to claim 13, wherein: The third magnetic column and the fourth magnetic column are symmetrically structured with the central magnetic column as the axis.

15. The magnetic integrated transformer according to claim 1, wherein: That is, the total magnetic flux of the first winding and the second winding is equal, where N p is the number of turns of the first winding, N s is the number of turns of the second winding, I p is the current of the first winding, I s is the current of the second winding.

16. The magnetic integrated transformer according to claim 15, wherein: The first winding is a planar winding, and the second winding is a planar winding.

17. The common-mode noise adjustment method of a magnetic integrated transformer according to claim 16, wherein: The common mode noise is adjusted by adjusting the structure capacitance between the first winding and the second winding.

18. The common-mode noise adjustment method of the magnetic integrated transformer according to claim 17, wherein: When the first winding and the second winding are single-layer planar coils and the area facing each other is constant, the structural capacitance is adjusted by adjusting the distance between the first winding and the second winding; When the first winding and the second winding are multi-layer planar coils and the facing areas between coil windings in different layers are constant, the structural capacitance is adjusted by adjusting the distance between different layers.

19. The common-mode noise adjustment method of a magnetic integrated transformer according to claim 17, wherein: Common-mode noise is suppressed by adjusting the structural capacitance between the first winding and the second winding.

20. The common-mode noise adjustment method of the magnetic integrated transformer according to claim 19, wherein: The common mode noise between the first winding and the second winding is reduced to zero.

21. A power supply, characterized in that: The method comprises the magnetically integrated transformer according to any one of claims 1 to 16.

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