Four-phase unlike terminal coupling magnetic integrated inductor

Abstract

The invention discloses a four-phase different-name end coupling magnetic integrated inductor which comprises an upper cover plate, a lower cover plate, four magnetic columns and four windings. The upper cover plate and the lower cover plate are the same in shape, and the four magnetic columns are the same in shape. The four magnetic columns are transversely and uniformly distributed at equal intervals around a vertical connecting line of the central point of the upper cover plate and the central point of the lower cover plate; the upper cover plate covers the upper surfaces of the four magnetic columns, and the lower cover plate covers the lower surfaces of the four magnetic columns; a partition air gap is further included; the four windings have the same structure and are respectively wound on the four magnetic columns to form a magnetically coupled four-phase inductor; after current excitation is applied to the four windings, the directions of magnetic fluxes generated in the four magnetic columns are the same. According to the invention, through coupling of the synonym ends of the four-phase windings, the directions of magnetic fluxes generated by four-phase inductive current in the magnetic core upper cover plate and the magnetic core lower cover plate are the same, so that the magnetic fluxes can be reduced to a certain extent. Inductive current ripples can be reduced, winding loss is reduced, and the current sharing degree and the rated value of four-phase inductive current can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic integration, in particular to a four-phase opposite-terminal coupled magnetic integrated inductor. Background Art

[0002] With the rapid development of industries such as aerospace, electric vehicles, new energy power generation, and green data centers, high efficiency, high power density, and lightweight miniaturization have become new trends in the future development of switching power supplies, and the focus of switching power supply development is on converter energy saving and loss reduction and size reduction. However, magnetic devices generally account for about 30% of the entire power supply volume, which is not conducive to the improvement of power density.

[0003] There are two main ways to reduce the volume of magnetic devices. One is high frequency. However, in order to reduce core loss and leave margin, the core is generally used at a reduced rate when working at high frequency, and the utilization rate of the core is not high. At the same time, high frequency will also be limited by the working conditions of the converter itself, thus limiting the miniaturization of magnetic components. Another method is to use magnetic integration technology. Thanks to the development of electronic module design technology and the advancement of magnetic technology, the miniaturization and high-efficiency design of magnetic components has become possible. At present, magnetic integration technology is an effective solution to reduce the volume and parasitic parameters of magnetic components, and can meet the increasingly urgent demand for miniaturization and thinness of switching power supplies. At the same time, gallium nitride high electron mobility transistors (GaN HEMTs) have become potential advantages of high-frequency power converters due to their high electron mobility, high switching frequency and low on-resistance. Coupled with the emergence of advanced magnetic materials and high-precision magnetic device processing and preparation technology, PCB planar magnetic devices have more flexible design solutions, higher magnetic material utilization efficiency, smaller volume, lower flux density, lower magnetic device loss and higher power density compared to traditional magnetic devices, providing a new option for magnetic integration design.

[0004] It has been verified that compared with the same-terminal coupled inductor, the application of the opposite-terminal coupled inductor to the interleaved parallel switching power supply based on GaN devices can reduce the loss of magnetic materials by 40%, thereby improving the power density and efficiency of the converter. In order to reduce the current ripple of the switching converter and improve the overall performance of the converter, the multi-phase interleaved parallel technology based on GaN devices has become an inevitable trend in design. The traditional two-phase switching converter needs to expand the number of phases to four phases or more, while the traditional reverse coupling structure based on EE or EI type magnetic core design can only be applied to two-phase converters, but not to multi-phase converters. Wang Laili et al. proposed a new design scheme for four-phase opposite-terminal coupled inductor devices. The design has a symmetrical magnetic structure and can effectively solve the problem of uneven magnetic flux density in the magnetic core. However, this scheme has problems such as redundant number of magnetic columns, large magnetic flux density of magnetic columns, and low magnetic core utilization. At the same time, the magnetic core is large in size and inconvenient to use. Summary of the invention

[0005] The purpose of the present invention is to provide a four-phase opposite-terminal coupled magnetic integrated inductor, which reduces the volume of magnetic devices, reduces the magnetic flux density of magnetic devices, and improves the utilization rate of magnetic cores by using the opposite-terminal coupling method.

[0006] The technical solution for achieving the purpose of the present invention is as follows:

[0007] The invention discloses a four-phase magnetic integrated inductor with opposite ends coupled, comprising an upper cover plate, a lower cover plate, four magnetic columns and four windings; the upper cover plate, the lower cover plate and the four magnetic columns are all made of magnetic materials; the upper cover plate and the lower cover plate have the same shape, and the four magnetic columns have the same shape; the four magnetic columns are evenly and evenly distributed laterally around the vertical line connecting the center point of the upper cover plate and the center point of the lower cover plate; the upper cover plate covers the upper surface of the four magnetic columns, and the lower cover plate covers the lower surface of the four magnetic columns; the invention also includes a first partition air gap, which is arranged between the upper cover plate and the upper surface of the four magnetic columns, or between the lower cover plate and the lower surface of the four magnetic columns, or the first partition air gap separates the four magnetic columns laterally into upper magnetic columns and lower magnetic columns respectively; the four windings have the same structure and are respectively wound on the four magnetic columns to form a magnetically coupled four-phase inductor; after current excitation is applied to the four windings, the magnetic flux generated in the four magnetic columns has the same direction.

[0008] Furthermore, the four magnetic pillars are cubes with a square cross section. After the four magnetic pillars are evenly and equidistantly distributed laterally around the vertical line connecting the center point of the upper cover plate and the center point of the lower cover plate, their transverse outer envelope is also a square. The peripheries of the upper cover plate and the lower cover plate form a "U" shape with the transverse outer envelope.

[0009] Furthermore, it also includes a second partition air gap; if the first partition air gap is set between the upper cover plate and the upper surface of the four magnetic pillars, the second partition air gap is set between the lower cover plate and the lower surface of the four magnetic pillars; if the first partition air gap is set between the lower cover plate and the lower surface of the four magnetic pillars, the second partition air gap is set between the upper cover plate and the upper surface of the four magnetic pillars; if the first partition air gap divides the four magnetic pillars into upper magnetic pillars and lower magnetic pillars respectively, the second partition air gap is set between the upper cover plate and the upper surface of the four magnetic pillars, or the second partition air gap is set between the lower cover plate and the lower surface of the four magnetic pillars.

[0010] Furthermore, it also includes a second partition air gap and a third partition air gap; if the first partition air gap is set between the upper cover plate and the upper surface of the four magnetic pillars, the second partition air gap is set between the lower cover plate and the lower surface of the four magnetic pillars, and the third partition air gap separates the four magnetic pillars laterally into upper magnetic pillars and lower magnetic pillars.

[0011] Furthermore, the winding is composed of copper foil wound around the periphery of the magnetic column, and an insulator is arranged between the turns.

[0012] Furthermore, the winding is composed of enameled wire, Litz wire or printed circuit board wound around the magnetic column.

[0013] Furthermore, the current excitation applied to the four windings has the same phase.

[0014] Furthermore, the four windings are set as the first, second, third and fourth windings in a clockwise or counterclockwise direction; the current excitation phase applied to the first winding is The current excitation phase of the second winding is The phase of the current excitation applied to the third winding is The current excitation phase of the fourth winding is in, is zero phase,

[0015] Furthermore, the four windings are set as the first, second, third and fourth windings in a clockwise or counterclockwise direction; the current excitation phase applied to the first winding is The current excitation phase of the second winding is The phase of the current excitation applied to the third winding is The current excitation phase of the fourth winding is in, is zero phase, and All are greater than 0° and less than or equal to 360°. Furthermore,

[0016] The beneficial effect of the present invention is that the four-phase opposite-end coupled magnetic integrated inductor is coupled through the opposite-end of the four-phase winding, so that the direction of the magnetic flux generated by the four-phase inductor current in the upper cover plate of the magnetic core and the lower cover plate of the magnetic core is the same, thereby being able to be reduced to a certain extent. Compared with the four-phase opposite-end coupled magnetic integrated inductor and four independent inductors, the present invention is conducive to reducing the ripple of the inductor current, thereby reducing the winding loss, and at the same time can improve the current balance and rated value of the four-phase inductor current and improve the transient response speed of the four-phase inductor current. Since the winding can be wound with copper foil, enameled wire, Litz wire, etc., or a printed circuit board is used, the space occupied by the winding is reduced. At the same time, in addition to the four magnetic columns, there is no redundant support column structure or magnetic material structure between the upper cover plate of the magnetic core and the lower cover plate of the magnetic core, which effectively reduces the volume of the four-phase opposite-end coupled magnetic integrated inductor, reduces the manufacturing cost, and improves the use efficiency and power density of the magnetic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of Example 1.

[0018] Figure 2It is an exploded view of Example 1. The markings in the figure are as follows: magnetic core upper cover plate 1, magnetic core lower cover plate 2, first magnetic column 31, second magnetic column 32, third magnetic column 33, fourth magnetic column 34, first phase inductor winding 41, second phase inductor winding 42, third phase inductor winding 43, fourth phase inductor winding 44.

[0019] Figure 3 Schematic diagram of current direction of Example 1.

[0020] Figure 4 This is the magnetic flux distribution diagram of the upper cover plate of Example 1.

[0021] Figure 5 This is the magnetic flux distribution diagram of the lower cover plate of Example 1.

[0022] Figure 6 This is the waveform diagram of the winding current (first current excitation phase) of Example 1.

[0023] Figure 7 This is the waveform diagram of the winding current (second current excitation phase) of Example 1.

[0024] Figure 8 This is the waveform diagram of the winding current (third current excitation phase) of Example 1.

[0025] Fig. 9 This is a schematic diagram of Example 1 applied to a four-phase parallel Buck converter.

[0026] Fig.10a This is a timing diagram of the first current excitation phase when Example 1 is applied to a four-phase parallel Buck converter.

[0027] Fig.10b This is a timing diagram of the second current excitation phase when Example 1 is applied to a four-phase parallel Buck converter.

[0028] Fig.10c This is a timing diagram of the third current excitation phase when Example 1 is applied to a four-phase parallel Buck converter.

[0029] Fig.11 It is an exploded view of Example 2. The markings in the figure are as follows: magnetic core upper cover plate 1, magnetic core lower cover plate 2, first lower magnetic column 31A, second lower magnetic column 32A, third lower magnetic column 33A, fourth lower magnetic column 34A, first upper magnetic column 31B, second upper magnetic column 32B, third upper magnetic column 33B, fourth upper magnetic column 34B, first phase inductor winding 41, second phase inductor winding 42, third phase inductor winding 43, fourth phase inductor winding 44. DETAILED DESCRIPTION

[0030] The invention provides a four-phase opposite-end coupled magnetic integrated inductor, comprising an upper cover plate, a lower cover plate, four magnetic columns and four windings; the upper cover plate, the lower cover plate and the four magnetic columns are all made of magnetic materials; the upper cover plate and the lower cover plate have the same shape, and the four magnetic columns have the same shape; the four magnetic columns are evenly and evenly distributed laterally around a vertical line connecting the center point of the upper cover plate and the center point of the lower cover plate; the upper cover plate covers the upper surfaces of the four magnetic columns, and the lower cover plate covers the lower surfaces of the four magnetic columns; it also includes a first partition air gap, which is arranged between the upper cover plate and the upper surfaces of the four magnetic columns, or between the lower cover plate and the lower surfaces of the four magnetic columns, or the first partition air gap laterally partitions the four magnetic columns into upper magnetic columns and lower magnetic columns respectively; the four windings have the same structure, are respectively wound on the four magnetic columns, and form a magnetically coupled four-phase inductor; after current excitation is applied to the four windings, the magnetic flux directions generated in the four magnetic columns are the same.

[0031] The magnetic columns can be arranged in different shapes, for example, their cross sections can be circular, elliptical, teardrop-shaped, etc. The upper and lower cover plates can cover the upper and lower surfaces of all the magnetic columns.

[0032] A second partition air gap can also be set, and the two partition air gaps can be set between the upper cover plate and the upper surface of the four magnetic columns, and between the lower cover plate and the lower surface of the four magnetic columns, respectively; one partition air gap can also be set between the upper cover plate and the upper surface of the four magnetic columns, and the other partition air gap separates the four magnetic columns into upper magnetic columns and lower magnetic columns; one partition air gap can also be set between the lower cover plate and the lower surface of the four magnetic columns, and the other partition air gap separates the four magnetic columns into upper magnetic columns and lower magnetic columns. By setting the first and second partition air gaps, it is helpful to reduce the overall volume of the four-phase opposite-end coupled magnetic integrated inductor and improve the power density. At the same time, it can further reduce the magnetic induction intensity in the upper cover plate, the lower cover plate and the four magnetic columns of the four-phase opposite-end coupled magnetic integrated inductor, effectively reduce the possibility of saturation of the magnetic device, and improve the rated value of the current excitation of the inductor winding. In addition, it can effectively reduce the magnetic flux at the edge of the air gap, thereby reducing the eddy current loss of the four-phase opposite-end coupled magnetic integrated inductor and improving the efficiency of the device.

[0033] A second and a third partitioning air gap may also be provided. The three partitioning air gaps are provided respectively between the upper cover plate and the upper surface of the four magnetic columns, between the lower cover plate and the lower surface of the four magnetic columns, and another partitioning air gap is provided to partition the four magnetic columns into upper magnetic columns and lower magnetic columns. By providing the first, second and third partitioning air gaps, it is beneficial to improve the power density of the four-phase opposite-end coupled magnetic integrated inductor, and at the same time, it can make the heat generated on the four magnetic columns more evenly distributed, which is helpful to improve the thermal performance of the four-phase opposite-end coupled magnetic integrated inductor. In addition, it can also effectively suppress the radiation of the magnetic field to the surrounding environment, reduce electromagnetic interference, and improve the electromagnetic compatibility characteristics of the four-phase opposite-end coupled magnetic integrated inductor.

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Embodiment 1:

[0036] like Figure 1 , Figure 2 As shown, the four-phase opposite-terminal coupled magnetic integrated inductor of this embodiment includes:

[0037] A magnetic core upper cover plate 1, a magnetic core lower cover plate 2, four magnetic columns 3 (marked as 31, 32, 33, 34 in the figure) and a four-phase inductor winding 4 (marked as 41, 42, 43, 44 in the figure), wherein the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2 have the same shape.

[0038] Four magnetic columns 3 are located between the upper core cover plate 1 and the lower core cover plate 2. The four magnetic columns 3 are symmetrically distributed, and the outer envelope lines and the edges of the upper core cover plate 1 and the lower core cover plate 2 form a U-shaped structure; while playing a supporting role between the upper core cover plate 1 and the lower core cover plate 2, they provide a symmetrical magnetic flux path for the four-phase inductor current.

[0039] The four-phase inductor windings 4 are respectively wound around one of the four magnetic columns 3. The inductor windings 4 wound on the four magnetic columns 3 have the same and symmetrical structures. The number of turns of the inductor winding on each magnetic column is determined according to the inductance value of the inductor and can be set to fractional turns. The four-phase windings 4 are respectively conductors passing through the space between the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2 except for the magnetic column they are wound on. The current flowing through each phase winding generates magnetic flux in the magnetic column wound by the winding, the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2.

[0040] The magnetic core upper cover plate 1 and the magnetic core lower cover plate 2 have the same shape and size, and are both square structures. The four magnetic columns 3 are cubes with square cross-sections, and are evenly and evenly distributed horizontally around the vertical line connecting the center point of the magnetic core upper cover plate 1 and the center point of the magnetic core lower cover plate 2. At the same time, the horizontal outer envelope of the four magnetic columns 3 is also a square, and the periphery of the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2 form a "U" shape with the horizontal outer envelope. At least one separating air gap is set between the four magnetic columns 3 and the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2. Between the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2, except for the four magnetic columns 3, there are no other supporting column structures or magnetic material structures.

[0041] The self-inductance and mutual inductance of the four-phase winding 4 depend on the number of turns of the winding, the air gap between the four magnetic columns 3 and the upper and lower covers 1 and 2 of the magnetic core, the cross-sectional area of ​​the magnetic columns, the thickness of the upper and lower covers 1 and 2 of the magnetic core, and the magnetic material.

[0042] Figure 3 is the direction of current excitation of the four-phase opposite-end coupled magnetic integrated inductor winding. Figure 3 When excitation is applied in the direction shown, the magnetic flux generated by the four-phase inductor winding 4 cancels each other in the magnetic circuit of the magnetic core upper cover plate 1 and the magnetic core lower cover plate 2, as shown in FIG. Figure 4 , Figure 5 shown.

[0043] Table 1 shows the winding coupling coefficient diagram of the four-phase opposite-end coupled magnetic integrated inductor subjected to finite element simulation under the above conditions. It can be seen that there is a magnetic coupling relationship between the four-phase inductor windings 4, and the magnetic coupling coefficients between adjacent two phases and diagonal two phases are different.

[0044] Table 1

[0045] Winding 1 Winding 2 Winding 3 Winding 4 Winding 1 1 -0.31753 -0.28712 -0.3203 Winding 2 -0.31753 1 -0.32078 -0.28643 Winding 3 -0.28712 -0.32078 1 -0.31771 Winding 4 -0.3203 -0.28643 -0.31771 1

[0046] The four-phase inductor winding 4 is one of copper foil, enameled wire, Litz wire and printed circuit board wound around four magnetic columns 3. If copper foil is used for winding, an insulator should be provided between turns to avoid short circuit.

[0047] When current excitation is applied, the current excitation phase of winding 1 can be Set to zero phase, the current excitation phase of other windings and All of them can be greater than 0° and less than or equal to 360°.

[0048] As a preferred embodiment, Figure 6 As shown, the current excitation phases applied to the four-phase winding 4 are the same. When external factors interfere with the excitation of the four-phase inductor windings and cause small phase differences and instantaneous value differences, the four-phase inductor currents can maintain a high degree of current sharing through the coupling of the opposite-name ends of the integrated magnetic device windings. The same current excitation phase can reduce the computing pressure of the converter controller and overcome the influence of different parasitic parameters of the four-phase inductor windings, which is suitable for low-voltage and high-current converter topology scenarios.

[0049] Another way to set the current excitation phase is as follows Figure 7 As shown, in the clockwise direction, among the four-phase windings 4, the current excitation phase of winding 1 is set is zero phase, and the current excitation phase on winding 2 is The current excitation phase on winding 3 is The current excitation phase on winding 4 is This current excitation phase causes the magnetic flux generated by the four-phase inductor winding 4 to cancel each other out in the magnetic circuit of the core upper cover plate 1 and the core lower cover plate 2, which is beneficial to reducing the inductor current ripple, alleviating the winding current stress, reducing the volume of the integrated inductor core, and facilitating the design of thermal management and packaging.

[0050] Another way to set the current excitation phase is as follows Figure 8 As shown, in the four-phase winding 4, the current excitation phase of winding 1 is set is zero phase, the current excitation phase on winding 2 is zero phase, and the current excitation phase on winding 3 is The current excitation phase on winding 4 is This current excitation phase has the characteristics of the above two current excitation phases, which can reduce the pressure on the controller computing power to a certain extent, and at the same time can reduce the inductor current ripple, and can improve the current balance of the four-phase inductor current to a certain extent. It is beneficial to reduce the volume of magnetic devices and improve the power density of magnetic devices.

[0051] like Fig. 9 As shown, the four-phase opposite-end coupled magnetic integrated inductor is applied to the four-phase parallel Buck converter.

[0052] Fig.10a , Fig.10b and Fig.10c The timing diagram of the four-phase opposite-end coupled magnetic integrated inductor applied to the four-phase parallel Buck converter includes the four-phase inductor winding voltage and the first-phase inductor winding current waveform.

[0053] Embodiment 2:

[0054] like Fig.11 As shown, in this embodiment, the four magnetic columns 3 are divided into two parts, the lower part magnetic columns 31A, 32A, 33A, 34A are connected to the lower cover plate 2 of the magnetic core, and the upper part magnetic columns 31B, 32B, 33B, 34B are connected to the upper cover plate 1 of the magnetic core, and the partition air gap is set between the lower part magnetic columns 31A, 32A, 33A, 34A of the lower part magnetic columns and the upper part magnetic columns 31B, 32B, 33B, 34B. A single partition air gap is set between the upper and lower magnetic columns, which can make the magnetic flux distribution in the four magnetic columns more uniform, while increasing the leakage magnetic flux and reducing the coupling coefficient between the four-phase inductor windings, which is conducive to increasing the equivalent decoupling inductance value of each of the four-phase windings, reducing the loss of the four-phase inductor windings, and improving the working efficiency of the four-phase opposite-end coupled magnetic integrated inductor. In addition, it can also improve the anti-magnetic saturation ability of the upper and lower covers and the four magnetic columns, and reduce the electromagnetic interference of the four-phase opposite-end coupled magnetic integrated inductor.

Claims

1. Four-phase opposite-terminal coupled magnetic integrated inductor, characterized in that: It includes an upper cover plate, a lower cover plate, four magnetic columns and four windings; the upper cover plate, the lower cover plate and the four magnetic columns are all made of magnetic materials; the upper cover plate and the lower cover plate have the same shape, and the four magnetic columns have the same shape; the four magnetic columns are evenly and evenly distributed laterally around the vertical line connecting the center point of the upper cover plate and the center point of the lower cover plate; the upper cover plate covers the upper surface of the four magnetic columns, and the lower cover plate covers the lower surface of the four magnetic columns; it also includes a first partition air gap, which is arranged between the upper cover plate and the upper surface of the four magnetic columns, or between the lower cover plate and the lower surface of the four magnetic columns, or the first partition air gap separates the four magnetic columns laterally into upper magnetic columns and lower magnetic columns respectively; the four windings have the same structure and are respectively wound on the four magnetic columns to form a magnetically coupled four-phase inductor; after the four windings are excited by current, the magnetic flux generated in the four magnetic columns has the same direction.

2. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The four magnetic columns are cubes with a square cross section. After the four magnetic columns are evenly distributed laterally around the vertical line connecting the center point of the upper cover plate and the center point of the lower cover plate, their transverse outer envelope is also a square. The peripheries of the upper cover plate and the lower cover plate form a "U" shape with the transverse outer envelope.

3. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: Also included is a second partition air gap; If the first partition air gap is arranged between the upper cover plate and the upper surfaces of the four magnetic pillars, the second partition air gap is arranged between the lower cover plate and the lower surfaces of the four magnetic pillars; If the first partition air gap is arranged between the lower cover plate and the lower surfaces of the four magnetic pillars, the second partition air gap is arranged between the upper cover plate and the upper surfaces of the four magnetic pillars; If the first partition air gap separates the four magnetic columns into upper magnetic columns and lower magnetic columns respectively, the second partition air gap is arranged between the upper cover plate and the upper surfaces of the four magnetic columns, or the second partition air gap is arranged between the lower cover plate and the lower surfaces of the four magnetic columns.

4. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: It also includes a second partition air gap and a third partition air gap; if the first partition air gap is set between the upper cover plate and the upper surface of the four magnetic pillars, the second partition air gap is set between the lower cover plate and the lower surface of the four magnetic pillars, and the third partition air gap separates the four magnetic pillars laterally into upper magnetic pillars and lower magnetic pillars.

5. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The winding is composed of copper foil wound around the periphery of the magnetic column, and an insulator is arranged between turns.

6. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The winding is composed of enameled wire, Litz wire or printed circuit board wound around the periphery of the magnetic column.

7. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The four windings are excited by currents with the same phase.

8. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The four windings are set as the first, second, third and fourth windings in a clockwise or counterclockwise direction; the current excitation phase applied to the first winding is φ1, the current excitation phase applied to the second winding is φ2, the current excitation phase applied to the third winding is φ3, and the current excitation phase applied to the fourth winding is φ4; wherein φ1 and φ2 are zero phases, and φ3=φ4=180°.

9. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 1, characterized in that: The four windings are set as the first, second, third and fourth windings in clockwise or counterclockwise direction; the first winding is applied with a current excitation phase of φ1, the second winding is applied with a current excitation phase of φ2, the third winding is applied with a current excitation phase of φ3, and the fourth winding is applied with a current excitation phase of φ4; wherein φ1 is a zero phase, φ2, φ3 and φ4 are all greater than 0° and less than or equal to 360°.

10. The four-phase opposite-terminal coupled magnetic integrated inductor according to claim 9, characterized in that: φ2=90°, φ3=180°, φ4=270°.

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