A three-phase LLC resonant converter based on a three-phase integrated magnetic

Abstract

This invention provides a three-phase LLC resonant converter based on a three-phase integrated magnetic component, relating to the field of power electronics technology applications. The three-phase integrated magnetic component integrates a three-phase transformer and a three-phase inductor, including a core and windings. The core includes a bottom yoke of the transformer, three winding magnetic pillars, and two common magnetic pillars; a top yoke of the inductor, three winding magnetic pillars, and two leakage inductance magnetic pillars; and a common magnetic yoke between the transformer magnetic pillars and the inductor magnetic pillars. The three winding magnetic pillars and two common magnetic pillars of the transformer are arranged side-by-side on the bottom yoke, with an air gap between them and the common magnetic yoke. The three winding magnetic pillars and two leakage inductance magnetic pillars of the inductor are arranged side-by-side below the top yoke, with an air gap between them and the common magnetic yoke. The three-phase integrated magnetic component is used in a three-phase LLC resonant converter. The beneficial effects of this patent are: reduced size, lower losses and costs, automatic three-phase current balancing, reduced interference, and expanded ZVS range, making it suitable for applications such as supercharging modules for new energy vehicles, server power supplies, and photovoltaic inverters.

Description

Technical Field

[0001] This utility model relates to the field of power electronic converters, and in particular to a three-phase LLC resonant converter based on three-phase integrated magnetic components. Technical Background

[0002] In recent years, new energy vehicles, big data centers, solar photovoltaic power generation systems, portable energy storage systems, and other new types of equipment have developed rapidly. Power supply equipment that provides power to these devices, such as on-board chargers, charging modules for DC supercharging piles, power supplies for big data center servers, solar photovoltaic inverters, and energy storage power supplies, requires increasingly higher power, smaller size, and higher efficiency. However, because the core circuits of these power supply devices generally use three-phase converters such as three-phase LLC resonant converters, three-phase LCC resonant converters, three-phase half-bridge converters, or three-phase full-bridge converters... The topology of these three-phase converters contains magnetic components such as three-phase transformers and three-phase inductors. These components are mostly discrete, which leads to a larger size and greater losses in these three-phase converters, making it difficult to improve power density and efficiency. On the other hand, it causes unequal inductance parameters in the three-phase converter, resulting in unbalanced currents in each phase. Some phases have larger currents, while others have smaller currents. Severe current asymmetry can burn out components in the branches with larger currents, damaging the power supply equipment. In addition, there are problems such as greater common-mode electromagnetic interference and a narrow range of zero-voltage switching (ZVS). Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a three-phase LLC resonant converter based on three-phase integrated magnetic components. This solves the problems of large size and losses, low power density and efficiency, unbalanced three-phase currents due to unequal three-phase inductance parameters, large common-mode electromagnetic interference, and large switching losses due to narrow ZVS range in existing three-phase parallel switching power supply equipment. This enables the three-phase parallel switching power supply to achieve high power, small size, low current fluctuation, low common-mode electromagnetic interference, and high-efficiency operation.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A three-phase LLC resonant converter based on a three-phase integrated magnetic component, wherein the three-phase integrated magnetic component integrates a three-phase transformer and a three-phase inductor, including an iron core and windings. The iron core includes a bottom yoke, three winding magnetic pillars, and two common magnetic pillars of the three-phase transformer; a top yoke, three winding magnetic pillars, and two leakage inductance magnetic pillars of the three-phase inductor; and a connection between the three winding magnetic pillars and the two common magnetic pillars of the three-phase transformer and the three winding magnetic pillars and the two leakage inductance magnetic pillars of the three-phase inductor. The common yoke; the bottom yoke, common yoke, and top yoke are all flat rectangular parallelepipeds; the three winding magnetic pillars and two common magnetic pillars of the three-phase transformer, and the three winding magnetic pillars and two leakage inductance magnetic pillars of the three-phase inductor are cylindrical or rectangular parallelepipeds; the windings include the three-phase primary and secondary windings of the three-phase transformer and the three-phase inductor windings; the three-phase primary and secondary currents flow in the three-phase primary and secondary windings, and the three-phase inductor currents flow in the three-phase inductor windings.

[0006] The three winding magnetic pillars and two common magnetic pillars of the three-phase transformer are arranged side by side on the bottom magnetic yoke, with the two common magnetic pillars positioned between the three winding magnetic pillars. The three-phase primary and secondary windings of the three-phase transformer are wound on the three winding magnetic pillars respectively. The common magnetic yoke is positioned directly above the three winding magnetic pillars and the two common magnetic pillars of the three-phase transformer, with air gaps between it and the three winding magnetic pillars. There is no air gap between the two common magnetic pillars of the three-phase transformer and the common magnetic yoke, so that the three-phase transformers are independent of each other and there is no magnetic field coupling between them. The outer edges of the bottom magnetic yoke and the common magnetic yoke extend beyond the outer edges of the three winding magnetic pillars of the three-phase transformer to improve the symmetry of the inductance parameters of the three-phase transformer.

[0007] The three winding magnetic pillars and two leakage inductance magnetic pillars of the three-phase inductor are arranged side by side below the top magnetic yoke of the three-phase inductor, with the two leakage inductance magnetic pillars positioned between the three winding magnetic pillars. The three-phase windings of the three-phase inductor are wound on the three winding magnetic pillars respectively. The three winding magnetic pillars and two leakage inductance magnetic pillars, after the three-phase inductor windings are wound, are positioned directly above the common magnetic yoke. There is an air gap between each of the three winding magnetic pillars and the common magnetic yoke, but no air gap between the two leakage inductance magnetic pillars and the common magnetic yoke, so that the three-phase inductors are independent of each other and there is no magnetic field coupling between them. The outer edges of the common magnetic yoke and the top magnetic yoke extend beyond the outer edges of the three winding magnetic pillars to improve the symmetry of the three-phase inductance parameters of the three-phase inductor.

[0008] The core can be made of ferrite, silicon steel sheet, iron-silicon, metal magnetic powder core, amorphous, nanocrystalline and other ferromagnetic materials; the winding can be made of cylindrical, rectangular, trapezoidal or thin sheet copper or aluminum and other metal materials with an outer insulating layer, and can be wound with single strand wire, multi-strand wire or Lizi wire or flat vertical winding wire.

[0009] The three-phase integrated magnetic component, which integrates a three-phase transformer and a three-phase inductor, is used in the three-phase LLC resonant converter, wherein the three-phase transformer serves as the three-phase resonant transformer of the three-phase LLC resonant converter, and the three-phase inductor serves as the three-phase resonant inductor of the three-phase LLC resonant converter;

[0010] To facilitate the installation of the toroidal winding, the left and right sides of the two common magnetic pillars of the three-phase transformer and the two leakage magnetic pillars of the three-phase inductor are changed to arc shapes. Four common magnetic pillars with arc-shaped inner sides are added to the empty positions at both ends of the bottom yoke to increase the magnetic flux of the three-phase transformer. Four leakage magnetic pillars with arc-shaped inner sides are also added to the empty positions at both ends of the top yoke of the three-phase inductor to increase the inductance of the three-phase inductor.

[0011] To reduce common-mode interference and expand the zero-voltage switching (ZVS) range, the three-phase resonant inductors of the three-phase LLC resonant converter are each split in two, forming six magnetically separated resonant inductors, which are respectively connected to both ends of the three-phase primary winding of the three-phase resonant transformer of the three-phase LLC resonant converter. To achieve magnetic integration of the six magnetically separated resonant inductors of the three-phase LLC resonant converter, the three-phase inductors of the aforementioned three-phase integrated magnetic component are magnetically separated to form two identical three-phase magnetically separated inductors. One of the three-phase magnetically separated inductors is still placed directly above the three-phase transformer of the aforementioned three-phase integrated magnetic component and connected to one end of the three-phase primary winding of the three-phase resonant transformer of the three-phase LLC resonant converter; the other three-phase magnetically separated inductor is placed directly below the three-phase transformer of the aforementioned three-phase integrated magnetic component and connected to the other end of the three-phase primary winding of the three-phase resonant transformer of the three-phase LLC resonant converter.

[0012] The beneficial effects of this invention are as follows: This invention provides a three-phase LLC resonant converter based on a three-phase integrated magnetic component, integrating a three-phase transformer and a three-phase inductor. The three-phase resonant transformer and three-phase resonant inductor of the three-phase LLC resonant converter integrate the six magnetic components of the three-phase LLC resonant converter into a single integrated magnetic component, reducing the size, losses, and cost of the three-phase LLC resonant converter. Furthermore, by magnetically coupling and integrating the three-phase resonant inductors, automatic balancing of the three-phase resonant current of the three-phase LLC resonant converter is achieved. By magnetically separating and magnetically integrating the three-phase resonant inductors of the three-phase LLC resonant converter, common-mode interference is reduced, the zero-voltage switching (ZVS) range is expanded, the size is reduced, and the power density is increased. The research results of this invention are of great significance to the development of high-power on-board chargers for new energy vehicles, charging modules for high-power DC supercharging piles, power supplies for big data center servers, solar photovoltaic inverters, and energy storage power technologies.

[0013] The following is in conjunction with the appendix picture The following examples illustrate the specifics. Appendix picture illustrate

[0014] To more clearly illustrate the embodiments, the accessories used in the embodiments will be described below. picture A brief introduction. It is obvious that the appendix described below... picture These are merely some embodiments of the present invention. Those skilled in the art can, without any creative effort, further explore these embodiments based on the appended descriptions. picture Obtain other attachments picture .

[0015] Figure 1a A front view of a three-phase integrated magnetic component that integrates a three-phase transformer and a three-phase inductor. picture .

[0016] Figure 1b yes Figure 1a A-A' of the three-phase transformer core with three-phase integrated magnetic components picture .

[0017] Figure 1c yes Figure 1a The B-B' view of the three-phase integrated magnetic components of the three-phase inductor core and winding picture .

[0018] Figure 1d yes Figure 1a Top view of the structure of the common magnetic yoke between the core magnetic column of a three-phase transformer and the core magnetic column of a three-phase inductor. picture .

[0019] Figure 1e Is adopted Figure 1a A circuit topology of a three-phase LLC resonant converter with three-phase integrated magnetic components. picture .

[0020] Figure 1f yes Figure 1b The top view of the three-phase transformer core shows the common magnetic column with rounded sides and the number of common magnetic columns increased from two to six. picture .

[0021] Figure 1g yes Figure 1c The structure of the three-phase inductor's core and windings is shown from below, with the sides of the leakage inductance columns changed to rounded arcs and the number of leakage inductance columns increased from two to six. picture .

[0022] Figure 2a yes Figure 1eThe circuit topology of the three-phase resonant inductor of the three-phase LLC resonant converter after magnetic separation. picture .

[0023] Figure 2b yes Figure 1a Main view of the structure of the three-phase magnetically separated inductor integrated magnetic component after magnetic separation of the three-phase inductor. picture .

[0024] Figure 3a yes Figure 1e The circuit topology of a three-phase LLC resonant converter with magnetically coupled integrated three-phase resonant inductors. picture .

[0025] Figure 3b yes Figure 1a The three-phase integrated magnetic component is a three-phase transformer core with two common magnetic pillars removed, and the height of the two leakage inductance magnetic pillars of the three-phase inductor core is reduced, forming an air gap between them and the common magnetic yoke to enable magnetic field coupling in the three-phase inductor. (Front view of the structure of the three-phase inductor coupling integrated magnetic component 1) picture .

[0026] Figure 4a yes Figure 3b The main view of the structure of the three-phase inductively coupled integrated magnetic component 2, in which two leakage inductance magnetic pillars of the three-phase inductively coupled integrated magnetic component 1 are placed outside the three winding magnetic pillars. picture .

[0027] Figure 4b yes Figure 4a The C-C' view of the three-phase inductively coupled integrated magnetic component 2 picture .

[0028] Figure 4c yes Figure 4b The inner sides of the two leakage inductance magnetic pillars of the three-phase inductor core of the three-phase inductor integrated magnetic component 2 are changed to arc shape. (The image of C-C' in the three-phase inductor integrated magnetic component 2 is missing.) picture .

[0029] Figure 5a yes Figure 2a The circuit topology of the three-phase magnetically separated resonant inductor LLC resonant converter after magnetic coupling integration of the three-phase magnetically separated resonant inductors. picture .

[0030] Figure 5b yes Figure 2b Front view of the structure of the three-phase magnetically separated inductor coupled integrated magnetic component 1 after magnetic field coupling of the three-phase magnetically separated inductor and the three-phase transformer. picture .

[0031] Figure 6 yes Figure 5b The main view of the structure of the three-phase magnetic separation inductor coupling integrated magnetic component 2, in which all four leakage inductance magnetic pillars of the three-phase magnetic separation inductor are moved to the outside of the winding magnetic pillars. picture .

[0032] picture In the diagram, T1, T2, T3 are three-phase transformers with integrated magnetic components; L1, L2, L3 are three-phase inductors with integrated magnetic components; 1 is the bottom yoke of three-phase transformers T1, T2, T3; 2 is the three winding magnetic posts of three-phase transformers T1, T2, T3; 3 is the two common magnetic posts of three-phase transformers T1, T2, T3; 4 is the common magnetic yoke between three-phase transformers T1, T2, T3 and three-phase inductors L1, L2, L3; 5 is the top yoke of three-phase inductors L1, L2, L3; 6 is the three winding magnetic posts of three-phase inductors L1, L2, L3; and 7 is the two leakage inductance magnetic posts of three-phase inductors L1, L2, L3.

[0033] g1 - Air gap between the three winding magnetic pillars 2 of three-phase transformers T1, T2, and T3 and the common magnetic yoke 4; g2 - Air gap between the three winding magnetic pillars 6 of three-phase inductors L1, L2, and L3 and the common magnetic yoke 4; g3 - Air gap between the two leakage inductance magnetic pillars 7 of three-phase inductors L1, L2, and L3 and the common magnetic yoke 4.

[0034] N P1 N P2 N P3 - The three primary windings of the three-phase transformers T1, T2, and T3; N S1 N S2 N S3 - The three secondary windings of three-phase transformers T1, T2, and T3; N1, N2, and N3 - The three inductor windings of three-phase inductors L1, L2, and L3; L S1 L S2 L S3 -Self-inductance of three-phase inductors L1, L2, and L3;

[0035] i P1 i P2 i P3 -Flow through the three primary windings N of the three-phase transformers T1, T2, and T3 P1 N P2 N p3 The current; i S1 i S2 i S3 -Flow through the three secondary windings N of the three-phase transformers T1, T2, and T3 S1 NS2 N S3 The current; i L1 i L2 i L3 - The current flowing through the three inductor windings N1, N2, and N3 of the three-phase inductors L1, L2, and L3;

[0036] L 11 L 21 L 31 and L 12 L 22 L 32 - The three-phase inductors L1, L2, and L3 are divided into two three-phase magnetically separated inductors; N 11 N 21 N 31 -Three-phase magnetic separation inductor L 11 L 21 L 31 The winding; N 12 N 22 N 32 -Three-phase magnetic separation inductor L 12 L 22 L 32 The winding; L S11 L S21 L S31 -Three-phase magnetic separation inductor L 11 L 21 L 31 Self-perception; L S12 L S22 L S32 -Three-phase magnetic separation inductor L 12 L 22 L 32 Self-awareness; i L11 i L21 i L31 i L12 i L22 i L32 -Flow through inductor winding N 11 N 21 N 31 N 12 N 22 N 32 The current;

[0037] V in - Input voltage of the three-phase LLC resonant converter, V o - Output voltage of the three-phase LLC resonant converter; R L - Load resistance of the three-phase LLC resonant converter; C r1 C r2 Cr3 -The three-phase resonant capacitor of the three-phase LLC resonant converter, L r1 L r2 L r3 - The three-phase resonant inductors of the three-phase LLC resonant converter; i1, i2, i3 - Flow through the three-phase resonant inductor L r1 L r2 L r3 Three-phase resonant current; T r1 T r2 T r3 - The three-phase resonant transformer of the three-phase LLC resonant converter; L mT1 L mT2 L mT3 -Three-phase resonant transformer T r1 T r2 T r3 Three-phase magnetizing inductor;

[0038] L r11 and L r12 L r21 and L r22 L r31 and L r32 - The three-phase resonant inductor L of the three-phase LLC resonant converter r1 L r2 L r3 Magnetic separation resonant inductor after magnetic separation;

[0039] L m1 L m2 L m3 - The excitation inductor after magnetic field coupling integration of the three-phase resonant inductors of a three-phase LLC resonant converter; M 12 M 23 M 13 - Mutual inductance after magnetic field coupling integration of the three-phase resonant inductors of a three-phase LLC resonant converter; L k1 L k2 L k3 - The resonant inductor after magnetic field coupling integration of the three-phase resonant inductors of a three-phase LLC resonant converter;

[0040] L m11 L m21 L m31 and L m12 L m22 L m32 -Magnetic separation excitation inductor after magnetic separation and magnetic coupling integration of the three-phase resonant inductor of the three-phase LLC resonant converter;

[0041] M 121 M 231 M 131and M 122 M 232 L 132 -Magnetic separation mutual inductance after magnetic separation and magnetic coupling integration of the three-phase resonant inductors of a three-phase LLC resonant converter;

[0042] L k11 L k21 L k31 and L k12 L k22 L k32 - The magnetically separated resonant inductor after magnetic separation and magnetic coupling integration of the three-phase resonant inductor of the three-phase LLC resonant converter. Detailed Implementation

[0043] The following is an illustration of the embodiments of the present invention. picture The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the core ideas and embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0044] To provide a full understanding of the invention, numerous specific details are set forth in the following detailed description, but those skilled in the art should understand that the invention can be implemented without these specific details.

[0045] Example 1:

[0046] See attached document Figure 1a 1b, 1c, 1d, a three-phase integrated magnetic component integrating three-phase transformers T1, T2, T3 and three-phase inductors L1, L2, L3, comprising an iron core and windings, wherein the iron core comprises: a bottom magnetic yoke 1, three winding magnetic pillars 2 and two common magnetic pillars 3 of the three-phase transformers T1, T2, T3; a top magnetic yoke 5, three winding magnetic pillars 6 and two leakage inductance magnetic pillars 7 of the three-phase inductors L1, L2, L3; and the three winding magnetic pillars 2 and two common magnetic pillars 3 of the three-phase transformers T1, T2, T3. The common yoke 4 is connected to the three winding magnetic pillars 6 and two leakage inductance magnetic pillars 7 of the three-phase inductors L1, L2, and L3; the bottom yoke 1, the common yoke 4, and the top yoke 5 are all flat rectangular parallelepipeds; the three winding magnetic pillars 2 and two common magnetic pillars 3 of the three-phase transformers T1, T2, and T3, and the three winding magnetic pillars 6 and two leakage inductance magnetic pillars 7 of the three-phase inductors L1, L2, and L3 are cylindrical or rectangular parallelepipeds; the windings include the three-phase primary windings N of the three-phase transformers T1, T2, and T3. P1 N P2 N P3 Three-phase secondary winding N S1 NS2 N S3 and three-phase inductor windings N1, N2, and N3; in the three-phase primary winding N P1 N P2 N P3 The three-phase primary current i flows through the middle P1 i P2 i P3 In the three-phase secondary winding N P1 N P2 N P3 The three-phase secondary current i flows through the middle S1 i S2 i S3 Three-phase inductor current i flows through the three-phase inductor windings N1, N2, and N3. L1 i L2 i L3 ;

[0047] The three winding magnetic columns 2 and two common magnetic columns 3 of the three-phase transformers T1, T2, and T3 are arranged side by side on the bottom magnetic yoke 1, with the two common magnetic columns 3 positioned between the three winding magnetic columns 2; the three-phase primary winding N of the three-phase transformers T1, T2, and T3 P1 N P2 N P3 and three-phase secondary winding N S1 N S2 N S3 The magnetic yoke 4 is wound around the three winding magnetic pillars 2 respectively; the common magnetic yoke 4 is placed directly above the three winding magnetic pillars 2 and the two common magnetic pillars 3 of the three-phase transformers T1, T2, and T3, and is separated from the three winding magnetic pillars 2 by an air gap g1; there is no air gap between the two common magnetic pillars 3 of the three-phase transformers T1, T2, and T3 and the common magnetic yoke 4, so that the three-phase transformers T1, T2, and T3 are independent of each other and there is no magnetic field coupling between them; the outer edges of the bottom magnetic yoke 1 and the common magnetic yoke 4 extend beyond the outer edges of the three winding magnetic pillars 2 of the three-phase transformers T1, T2, and T3 to improve the symmetry of the three-phase inductance parameters of the three-phase transformers T1, T2, and T3;

[0048] The three winding magnetic posts 6 and two leakage inductance magnetic posts 7 of the three-phase inductors L1, L2, and L3 are arranged side by side below the top magnetic yoke 5 of the three-phase inductors L1, L2, and L3, with the two leakage inductance magnetic posts 7 positioned between the three winding magnetic posts 6; the windings N1, N2, and N3 of the three-phase inductors L1, L2, and L3 are respectively wound on the three winding magnetic posts 6; after winding the three-phase inductor windings N1, N2, and N3, the three winding magnetic posts 6 and the two leakage inductance magnetic posts 7 are complete. The magnetic column 2 is placed directly above the common magnetic yoke 4. There is an air gap g2 between each of the three winding magnetic columns 6 and the common magnetic yoke 4. There is no air gap between the two leakage magnetic columns 7 and the common magnetic yoke 4, so that the three-phase inductors L1, L2, and L3 are independent of each other and there is no magnetic field coupling between them. The outer edges of the common magnetic yoke 4 and the top magnetic yoke 5 extend beyond the outer edges of the three winding magnetic columns 6 to improve the symmetry of the three-phase inductance parameters of the three-phase inductors L1, L2, and L3.

[0049] The core can be made of ferrite, silicon steel sheet, iron-silicon, metal magnetic powder core, amorphous, microcrystalline and other ferromagnetic materials. The winding can be made of cylindrical, rectangular, trapezoidal or thin sheet copper or aluminum metal materials with an outer insulating layer. It can be wound with single strand wire, multi-strand wire or Lizi wire, or flat vertical winding wire.

[0050] See attached document Figure 1e The three-phase integrated magnetic components are used in a three-phase LLC resonant converter, wherein the three-phase transformers T1, T2, and T3 of the three-phase integrated magnetic components serve as the three-phase resonant transformers T of the three-phase LLC resonant converter. r1 T r2 T r3 The three-phase inductors L1, L2, and L3 of the three-phase integrated magnetic components serve as the three-phase resonant inductors L of the three-phase LLC resonant converter. r1 L r2 L r3 ;

[0051] See attached document Figure 1f , 1g To facilitate the installation of the toroidal windings, the outer sides of the two common magnetic pillars 3 of the three-phase transformers T1, T2, and T3 and the two leakage magnetic pillars 7 of the three-phase inductors L1, L2, and L3 are changed to arc shapes. Four common magnetic pillars 3 with arc-shaped inner sides are added to the empty positions at both ends of the bottom magnetic yoke 1 of the three-phase transformers T1, T2, and T3 to increase the magnetic flux of the three-phase transformers T1, T2, and T3. Four leakage magnetic pillars 7 with arc-shaped inner sides are also added to the empty positions at both ends of the top magnetic yoke 5 of the three-phase inductors L1, L2, and L3 to increase the inductance of the three-phase inductors L1, L2, and L3.

[0052] Example 2:

[0053] See attached document Figure 2a To reduce common-mode interference and expand the zero-voltage switching (ZVS) range, the three-phase resonant inductor L of the three-phase LLC resonant converter described in Example 1 is... r1 L r2 L r3 Divide into two: L r11 and L r12 L r21 and L r22 L r31 and L r32 That is, magnetic separation is performed, and the three-phase resonant transformers T of the three-phase LLC resonant converter are respectively connected. r1 T r2 T r3 The two ends of the primary winding form a three-phase magnetically separated resonant inductor LLC resonant converter;

[0054] See attached document Figure 2b Example 1 Figure 1a The three-phase inductors L1, L2, and L3 are divided into two structurally identical three-phase magnetically separated inductors: L 11 L 21 L 31 and L 12 L 22 L 32 That is, magnetic separation is performed, and the three-phase magnetic separation inductor L 11 L 21 L 31 The three-phase magnetic separation inductor L is positioned above the common magnetic yoke 4. 11 L 21 L 31 The three winding magnetic pillars 6 are all separated from the common magnetic yoke 4 by an air gap g2; the three-phase magnetic separation inductor L 12 L 22 L 32 The three-phase magnetic separation inductor L is located below the bottom magnetic yoke 1 of the three-phase transformers T1, T2, and T3. 12 L 22 L 32 The three winding magnetic pillars 6 are all separated from the bottom magnetic yoke 1 by an air gap g2; the two three-phase magnetic separation inductors L 11 L 21 L 31 and L 12 L 22 L 32 Together with the three-phase transformers T1, T2, and T3, they constitute a three-phase magnetically separated inductor integrated magnetic component;

[0055] The magnetic separation inductor L is an integrated magnetic component of the three-phase magnetic separation inductor. 11 L 21 L 31 and L 12 L 22 L 32 The three-phase resonant transformers T are respectively connected to the three-phase magnetically separated resonant inductor LLC resonant converter. r1 T r2 T r3 The two ends of the primary winding serve as the three-phase magnetically separated resonant inductor L of the three-phase magnetically separated resonant inductor LLC resonant converter. r11 L r21 L r31 and L r12 L r22 L r32 .

[0056] Example 3:

[0057] See attached document Figure 3a In order to achieve the first embodiment Figure 1e The balancing of the three-phase resonant currents i1, i2, and i3 in the three-phase LLC resonant converter will balance the three-phase resonant inductor L r1 L r2 L r3 Reverse magnetic coupling integration is performed to form a three-phase resonant inductor magnetically coupled integrated LLC resonant converter. The magnetically coupled integrated three-phase excitation inductor is L. m1 L m2 L m3 The three mutual inductances of the magnetically coupled integrated system are M 12 M 23 M 13 Magnetic coupling integrated three-phase leakage inductance L k1 L k2 L k3 The three-phase resonant inductor serves as the magnetically coupled integrated LLC resonant converter of the aforementioned three-phase resonant inductor.

[0058] See attached document Figure 3b In order to achieve the attached Figure 3a The magnetic coupling integration of the three-phase resonant inductor in the described three-phase resonant inductor magnetically coupled integrated LLC resonant converter incorporates the appendix of Embodiment 1. Figure 1a The height of the two leakage inductance magnetic pillars 7 of the three-phase inductors L1, L2, and L3 in the three-phase integrated magnetic component is reduced, and an air gap g3 is formed between them and the common magnetic yoke 4. This causes a portion of the magnetic flux of the three-phase inductors L1, L2, and L3 to couple in opposite directions, forming a three-phase magnetizing inductance and mutual inductance, serving as an auxiliary... Figure 3a The three-phase magnetizing inductor L of the three-phase resonant inductor magnetically coupled integrated LLC resonant converter m1 Lm2 L m3 Mutual attraction between the three 12 M 23 M 13 This achieves the balance of the three-phase resonant currents i1, i2, and i3; another portion of the magnetic flux of the three-phase inductors L1, L2, and L3 forms leakage inductance through the two leakage inductance magnetic pillars 7 and the air gap g3, serving as an auxiliary current. Figure 3a The three-phase resonant inductor magnetically coupled integrated LLC resonant converter has a three-phase resonant inductor L r1 L r2 L r3 ;

[0059] Appendix of Example 1 Figure 1a The two common magnetic posts 3 of the three-phase transformers T1, T2, and T3 in the three-phase integrated magnetic component are removed, simplifying the core structure and realizing the mutual coupling of magnetic flux and magnetic coupling integration of the three-phase transformers T1, T2, and T3, for use in the attached... Figure 3a The three-phase resonant transformer T of the three-phase resonant inductor magnetic coupling integrated LLC resonant converter r1 T r2 T r3 To realize the three-phase resonant transformer T r1 T r2 T r3 The balance of the three-phase excitation current;

[0060] Through the magnetic coupling integration of the three-phase inductors L1, L2, and L3 and the magnetic coupling integration of the three-phase transformers T1, T2, and T3, attached... Figure 1a The three-phase uncoupled integrated magnetic component becomes an accessory Figure 3b The three-phase magnetic coupling integrated magnetic component.

[0061] Example 4:

[0062] See attached document Figure 4a 4b, the appendix of Example 3 Figure 3b The two leakage inductance magnetic posts 7 of the three-phase inductors L1, L2, and L3 of the three-phase magnetic coupling integrated magnetic component are moved to the outside of the three winding magnetic posts 6.

[0063] See attached document Figure 4c , will attach Figure 4a The inner sides of the two leakage inductance magnetic pillars 7 described in 4b are changed to be arc-shaped to accommodate the annular windings N1, N2, and N3 of the three-phase inductors L1, L2, and L3.

[0064] Example 5:

[0065] See attached document Figure 5a In order to achieve the appendix of embodiment two Figure 2aThe balancing of the three-phase resonant currents i1, i2, and i3 in the three-phase magnetically separated resonant inductor LLC resonant converter will balance the three-phase magnetically separated resonant inductor L r11 L r21 L r31 Magnetic coupling integration is performed, and the three-phase excitation inductor of the magnetic coupling integration is L. m11 L m21 L m31 The three mutual inductions are M 121 M 231 M 131 The magnetically coupled integrated three-phase leakage inductance serves as the magnetically separated resonant inductor L in the three-phase LLC resonant converter. k11 L k21 L k31 ; will attach Figure 2a The three-phase magnetically separated resonant inductor L r12 L r22 L r32 Magnetic coupling integration is performed, and the three-phase excitation inductor of the magnetic coupling integration is L. m12 L m22 L m32 The three mutual inductions are M 122 M 232 M 132 The magnetically coupled integrated three-phase leakage inductance serves as the magnetically separated resonant inductor L in the three-phase LLC resonant converter. k12 L k22 L k32 Forming a three-phase magnetically separated resonant inductively coupled integrated LLC resonant converter;

[0066] See attached document Figure 5b In order to achieve the attached Figure 5a The magnetic coupling integration of the three-phase magnetically separated resonant inductor of the three-phase LLC resonant converter, as described in Embodiment 2, incorporates the magnetic coupling of the inductor. Figure 2b The three-phase magnetic separation inductor integrated magnetic component, magnetic separation inductor L 11 L 21 L 31 The height of the two leakage magnetic pillars 7 is reduced, and an air gap g3 is formed between them and the common magnetic yoke 4; thus forming a three-phase magnetically coupled integrated magnetically separated inductor.

[0067] Appendix of Example 2 Figure 2b The three-phase magnetic separation inductor integrated magnetic component, magnetic separation inductor L 12 L 22 L 32 The height of the two leakage magnetic columns 7 is reduced, and an air gap g3 is formed between them and the bottom magnetic yoke 1; thus forming a three-phase magnetically coupled integrated magnetic separation inductor II.

[0068] Appendix of Example 2 Figure 2bThe two common magnetic columns 3 of the three-phase transformers T1, T2, and T3 of the three-phase magnetically separated inductor integrated magnetic component are removed, simplifying the core structure and forming a three-phase magnetically coupled transformer.

[0069] The three-phase magnetically coupled integrated magnetic separation inductor one, the three-phase magnetically coupled transformers T1, T2, and T3, and the three-phase magnetically coupled integrated magnetic separation inductor two constitute the three-phase magnetic separation inductor coupled integrated magnetic component one.

[0070] The three-phase excitation inductance and three-phase mutual inductance of the three-phase magnetic coupling integrated magnetic component one are used as auxiliary components. Figure 5a The three-phase magnetically separated excitation inductor L of the three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter m11 L m21 L m31 and three-phase magnetic separation mutual inductance M 121 M 231 M 131 The three-phase leakage inductance of the three-phase magnetically coupled integrated magnetically separated inductor is used as an auxiliary... Figure 5a The three-phase magnetically separated resonant inductor of the integrated LLC resonant converter is described. k11 L k21 L k31 ;

[0071] The three-phase excitation inductance and three-phase mutual inductance of the three-phase magnetic coupling integrated magnetic component one are used as auxiliary components. Figure 5a The three-phase magnetically separated excitation inductor L of the three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter m12 L m22 L m32 and three-phase magnetic separation mutual inductance M 122 M 232 M 132 The three-phase leakage inductance of the three-phase magnetically coupled integrated magnetically separated inductor II serves as an auxiliary... Figure 5a The three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter has a three-phase magnetically separated resonant inductor L k12 L k22 L k32 ;

[0072] Three-phase magnetic coupling transformers T1, T2, and T3 of the three-phase magnetic separation inductive coupling integrated magnetic component are used for... Figure 5a The three-phase resonant transformer T of the three-phase magnetic separation resonant inductively coupled integrated LLC resonant converter r1 T r2 T r3 .

[0073] Example 6:

[0074] See attached document Figure 6 Appendix of Example 5 Figure 5b The three-phase magnetically separated inductively coupled integrated magnetic component L 11 L 21 L 31 The two leakage inductance posts 7 are moved to the outside of the three winding posts 6, thus connecting the three-phase coupled integrated magnetic separation inductor L. 12 L 22 L 32 The two leakage inductance magnetic pillars 7 are moved to the outside of the three winding magnetic pillars 6; forming a three-phase magnetically separated inductively coupled integrated magnetic component two.

[0075] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. For example, the three-phase LLC resonant converter based on three-phase integrated magnetic components proposed in this invention can also be used for four-phase or more LLC resonant converters based on four-phase or more integrated magnetic components. This specification uses the above embodiments to describe the principles and implementation methods of the present invention. The above embodiments are only used to help understand the method and core ideas of the present invention; at the same time, those skilled in the art will understand that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A three-phase LLC resonant converter based on three-phase integrated magnetic components, characterized in that: The three-phase integrated magnetic component integrates a three-phase transformer and a three-phase inductor, including a core and windings. The core includes: a bottom yoke, three winding posts, and two common posts of the three-phase transformer; a top yoke, three winding posts, and two leakage inductance posts of the three-phase inductor; the common yoke between the three winding posts and two common posts of the three-phase transformer and the three winding posts and two leakage inductance posts of the three-phase inductor; the bottom yoke, common yoke, and top yoke are all flat rectangular parallelepipeds; the three winding posts and two common posts of the three-phase transformer, and the three winding posts and two leakage inductance posts of the three-phase inductor are all cylindrical or rectangular parallelepipeds; the windings include the three-phase primary and secondary windings of the three-phase transformer and the windings of the three-phase inductor; three-phase primary and secondary currents flow in the three-phase primary and secondary windings of the three-phase transformer, and three-phase inductance currents flow in the three-phase windings of the three-phase inductor; The three winding magnetic columns and two common magnetic columns of the three-phase transformer are arranged side by side on the bottom magnetic yoke, with the two common magnetic columns positioned between the three winding magnetic columns. The three-phase primary and secondary windings of the three-phase transformer are wound on the three winding magnetic columns respectively. The common magnetic yoke is positioned directly above the three winding magnetic columns and the two common magnetic columns of the three-phase transformer, forming an air gap between it and each of the three winding magnetic columns. There is no air gap between the two common magnetic columns and the common magnetic yoke of the three-phase transformer, so that the three-phase transformers are independent of each other and there is no magnetic field coupling between them. The outer edges of the bottom magnetic yoke and the common magnetic yoke extend beyond the outer edges of the three winding magnetic columns of the three-phase transformer to improve the symmetry of the three-phase inductance parameters of the three-phase transformer. The three winding magnetic pillars and two leakage inductance magnetic pillars of the three-phase inductor are arranged side by side below the top magnetic yoke of the three-phase inductor, with the two leakage inductance magnetic pillars positioned between the three winding magnetic pillars. The three-phase windings of the three-phase inductor are wound on the three winding magnetic pillars respectively. The three winding magnetic pillars and two leakage inductance magnetic pillars, after the three-phase inductor windings are wound, are positioned directly above the common magnetic yoke. There is an air gap between each of the three winding magnetic pillars and the common magnetic yoke, but no air gap between the two leakage inductance magnetic pillars and the common magnetic yoke, so that the three-phase inductors are independent of each other and there is no magnetic field coupling between them. The outer edges of the common magnetic yoke and the top magnetic yoke extend beyond the outer edges of the three winding magnetic pillars on both sides to improve the symmetry of the three-phase inductance parameters of the three-phase inductor. The core can be made of ferrite, silicon steel sheet, iron-silicon, metal magnetic powder core, amorphous, or nanocrystalline materials. The winding can be made of copper or aluminum material with a cylindrical, rectangular, trapezoidal, or sheet-shaped outer insulating layer. It can be wound with single-strand wire, multi-strand wire, or Lizi wire, or flat vertical winding wire. The three-phase integrated magnetic component is used in the three-phase LLC resonant converter, the three-phase transformer of the three-phase integrated magnetic component serves as the three-phase resonant transformer of the three-phase LLC resonant converter, and the three-phase inductor of the three-phase integrated magnetic component serves as the three-phase resonant inductor of the three-phase LLC resonant converter. To facilitate the installation of the toroidal winding, the outer sides of the two common magnetic pillars of the three-phase transformer and the two leakage magnetic pillars of the three-phase inductor are changed to arc shapes; four common magnetic pillars with arc-shaped inner sides are added to the empty positions at both ends of the bottom magnetic yoke of the three-phase transformer to increase the magnetic flux of the three-phase transformer; four leakage magnetic pillars with arc-shaped inner sides are also added to the empty positions at both ends of the top magnetic yoke of the three-phase inductor to increase the inductance of the three-phase inductor.

2. The three-phase LLC resonant converter based on three-phase integrated magnetic components according to claim 1, characterized in that: To reduce common-mode interference and expand the zero-voltage switching range, the three-phase resonant inductors of the three-phase LLC resonant converter are divided into two: that is, magnetic separation is performed, and they are respectively connected to the two ends of the primary winding of the three-phase resonant transformer of the three-phase LLC resonant converter to form a three-phase magnetically separated resonant inductor LLC resonant converter. The three-phase inductor of the three-phase integrated magnetic component according to claim 1 is divided into two structurally identical three-phase magnetically separated inductors. One three-phase magnetically separated inductor is placed above the common magnetic yoke, and each of the three winding magnetic columns of the three-phase magnetically separated inductor is separated from the common magnetic yoke by an air gap. The other three-phase magnetically separated inductor is placed below the bottom magnetic yoke of the three-phase transformer, and each of the three winding magnetic columns of the three-phase magnetically separated inductor is separated from the bottom magnetic yoke by an air gap. The two three-phase magnetically separated inductors and the three-phase transformer constitute the three-phase magnetically separated inductor integrated magnetic component. The two three-phase magnetically separated inductors of the three-phase magnetically separated inductor integrated magnetic component are respectively connected to the two ends of the primary winding of the three-phase resonant transformer of the three-phase magnetically separated resonant inductor LLC resonant converter, as the three-phase magnetically separated resonant inductor of the three-phase magnetically separated resonant inductor LLC resonant converter.

3. The three-phase LLC resonant converter based on three-phase integrated magnetic components according to claim 1, characterized in that: To achieve the balance of the three-phase resonant current in the three-phase LLC resonant converter, its three-phase resonant inductors are integrated by reverse magnetic coupling to form a three-phase resonant inductor magnetic coupling integrated LLC resonant converter, which includes a magnetically coupled integrated three-phase excitation inductor, mutual inductance and leakage inductance. The three-phase leakage inductance serves as the three-phase resonant inductor of the three-phase resonant inductor magnetic coupling integrated LLC resonant converter. To achieve the magnetic coupling integration of the three-phase resonant inductors in the three-phase resonant inductor magnetic coupling integrated LLC resonant converter, the height of the two leakage inductor columns of the three-phase inductor in the three-phase integrated magnetic component of claim 1 is reduced, and an air gap is formed between them and the common yoke. This allows a portion of the magnetic flux of the three-phase inductor to be coupled in opposite directions to form a three-phase magnetizing inductance and mutual inductance, which serve as the magnetizing inductance and mutual inductance of the three-phase resonant inductor magnetic coupling integrated LLC resonant converter, thereby achieving the balance of its three-phase resonant current. The other portion of the magnetic flux of the three-phase inductor forms a three-phase leakage inductance through the two leakage inductor columns and the air gap, serving as the three-phase resonant inductor of the three-phase resonant inductor magnetic coupling integrated LLC resonant converter. The two common magnetic columns of the three-phase transformer of the three-phase integrated magnetic component as described in claim 1 are removed to simplify the core structure and realize the mutual coupling of magnetic flux and magnetic coupling integration of the three-phase transformer. This is used as a three-phase resonant transformer for a three-phase resonant inductor magnetic coupling integrated LLC resonant converter to achieve the balance of the three-phase excitation current of the three-phase transformer.

4. The three-phase LLC resonant converter based on three-phase integrated magnetic components according to claim 3, characterized in that: The two leakage inductance posts of the three-phase inductor of the three-phase integrated magnetic component are moved to the outside of the three winding posts; the inner sides of the two leakage inductance posts are changed to be arc-shaped to adapt to the annular winding of the three-phase inductor.

5. The three-phase LLC resonant converter based on three-phase integrated magnetic components according to claim 2, characterized in that: To achieve three-phase resonant current balance in the three-phase magnetically separated resonant inductor LLC resonant converter, one set of three-phase magnetically separated resonant inductors is magnetically coupled and integrated to form a magnetically coupled integrated set of three-phase magnetizing inductor, mutual inductance, and leakage inductance, wherein the three-phase leakage inductance serves as one set of three-phase magnetically separated resonant inductors in the three-phase LLC resonant converter; another set of three-phase magnetically separated resonant inductors is magnetically coupled and integrated to form another magnetically coupled integrated set of three-phase magnetizing inductor, mutual inductance, and leakage inductance, wherein the three-phase leakage inductance serves as another set of three-phase magnetically separated resonant inductors in the three-phase LLC resonant converter; thus forming a three-phase magnetically separated resonant inductor coupled integrated LLC resonant converter. To achieve the magnetic coupling integration of the three-phase magnetically separated resonant inductors in the three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter, the height of the two leakage inductor columns of one of the three-phase magnetically separated inductors in claim 2 is reduced, and an air gap is formed between them and the common magnetic yoke; thus forming a three-phase magnetically coupled integrated magnetically separated inductor. The height of the two leakage columns of another three-phase magnetically separated inductor of the three-phase magnetically separated inductor integrated magnetic component as described in claim 2 is reduced, and an air gap is formed between them and the bottom magnetic yoke; thus forming a second three-phase magnetically coupled integrated magnetically separated inductor. The two common magnetic columns of the three-phase transformer with the three-phase magnetically separated inductor integrated magnetic component as described in claim 2 are removed, simplifying the core structure and forming a three-phase magnetically coupled transformer. The three-phase magnetically coupled integrated magnetic separation inductor one, the three-phase magnetically coupled transformer, and the three-phase magnetically coupled integrated magnetic separation inductor two constitute the three-phase magnetic separation inductor coupled integrated magnetic component one; The three-phase magnetizing inductor, three-phase mutual inductor and three-phase leakage inductor of the three-phase magnetically separated inductor-coupled integrated magnetic component one are one set of three-phase magnetically separated magnetizing inductor, three-phase magnetically separated mutual inductor and three-phase magnetically separated resonant inductor of the three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter of the present claim. The three-phase magnetizing inductor, three-phase mutual inductor and three-phase leakage inductor of the three-phase magnetically separated inductor-coupled integrated magnetic component one serve as another set of three-phase magnetically separated magnetizing inductor, three-phase magnetically separated mutual inductor and three-phase magnetically separated resonant inductor of the three-phase magnetically separated resonant inductor-coupled integrated LLC resonant converter of the present claim. The three-phase magnetic coupling transformer of the three-phase magnetic separation inductive coupling integrated magnetic component one serves as the three-phase resonant transformer of the three-phase magnetic separation resonant inductive coupling integrated LLC resonant converter described in this claim.

6. The three-phase LLC resonant converter based on three-phase integrated magnetic components according to claim 5, characterized in that: The two leakage inductance columns of the three-phase inductor of the three-phase magnetic coupling integrated magnetic inductor of the first three-phase magnetic separation inductor are moved to the outside of the three winding columns; the two leakage inductance columns of the three-phase inductor of the second three-phase magnetic coupling integrated magnetic inductor of the first three-phase magnetic separation inductor are moved to the outside of the three winding columns, thus forming the second three-phase magnetic separation inductor.

Images