All-in-one integrated magnetic core structure suitable for LCL resonant cavity

Abstract

The invention discloses an all-in-one integrated magnetic core structure suitable for an LCL resonant cavity. A middle column of a first resonant inductor L1 is spliced with a multi-section middle column of the first resonant inductor L1 and a middle column of a third resonant inductor L1; the middle column of the second resonant inductor L1 is spliced with the multi-section middle column of the second resonant inductor L1 and the middle column of the fourth resonant inductor L1; the middle column of the first resonant inductor L2 is spliced with the multi-section middle column of the first resonant inductor L2 and the middle column of the third resonant inductor L2; and the middle column of the second resonant inductor L2 is spliced with the multi-section middle column of the second resonant inductor L2 and the middle column of the fourth resonant inductor L2, so that integration of one transformer and two resonant inductors can be realized, and the eddy-current loss is relatively low.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and relates to a multi-in-one integrated magnetic core structure applicable to an LCL resonant cavity. Background Art

[0002] In isolated DC / DC and DC / AC converters, components such as transformers and inductors occupy a relatively large proportion of volume, weight, loss, and cost. Especially in resonant converters, the complex resonant cavity structure brings a larger number of magnetic components, increasing the design complexity. The magnetic component integration technology is a means that can effectively reduce the number of converter components and the design and assembly complexity of the converter. By coupling the magnetic circuits to share the magnetic core path, the amount of magnetic core material can also be saved and the iron loss can be reduced.

[0003] In traditional magnetic integration schemes, it is common to directly use the leakage inductance of the transformer as the series resonant inductance. However, in this scheme, the leakage inductance parameter distribution is too large, and when a large series resonant inductance is required, the leakage inductance value is insufficient. Another scheme is to use an additional inductor middle leg, and a low magnetic resistance loop is shared between the inductor magnetic core and the transformer magnetic core to achieve coupling integration. However, this scheme still requires additional inductor winding and has no advantage in copper loss. In addition, there is a relatively better scheme which is to use an additional inductor side leg. The side leg surrounds the excitation middle leg of the transformer, and the primary and secondary windings are respectively wound around the outer and inner circles of the inductor side leg. In this way, the uncoupled magnetic flux falls on the inductor side leg to form a series inductance. However, this scheme requires a large air gap to be opened on the inductor side leg, generating a large range of air gap diffusion magnetic flux and linking to the winding, increasing the eddy current loss.

[0004] More importantly, the above-mentioned magnetic component integration technology is mainly concentrated in the applications of traditional LLC converters and DAB converters, where only one transformer and the resonant inductor need to be integrated. For higher-order resonant cavities, such as LCL-type resonant cavities, one transformer and two resonant inductors need to be integrated, and there is currently no magnetic integration scheme. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provides a multi-in-one integrated magnetic core structure applicable to an LCL resonant cavity, which can realize the integration of one transformer and two resonant inductors and has relatively low eddy current loss.

[0006] To achieve the above object, the present invention discloses a multi-in-one integrated magnetic core structure applicable to an LCL resonant cavity, which includes an upper transformer magnetic core, a lower transformer magnetic core, a multi-segment middle column of the first resonant inductor L1, a multi-segment middle column of the second resonant inductor L1, a multi-segment middle column of the first resonant inductor L2, and a multi-segment middle column of the second resonant inductor L2; the upper transformer magnetic core includes a first top cover and a middle column of the first resonant inductor L1, a middle column of the second resonant inductor L1, a middle column of the first resonant inductor L2, and a middle column of the second resonant inductor L2 on the first top cover; the lower transformer magnetic core includes a second top cover and a middle column of the third resonant inductor L1, a middle column of the fourth resonant inductor L1, a middle column of the third resonant inductor L2, and a middle column of the fourth resonant inductor L2 on the second top cover;

[0007] The middle column of the first resonant inductor L1 is spliced with the multi-segment middle column of the first resonant inductor L1 and the middle column of the third resonant inductor L1; the middle column of the second resonant inductor L1 is spliced with the multi-segment middle column of the second resonant inductor L1 and the middle column of the fourth resonant inductor L1; the middle column of the first resonant inductor L2 is spliced with the multi-segment middle column of the first resonant inductor L2 and the middle column of the third resonant inductor L2; the middle column of the second resonant inductor L2 is spliced with the multi-segment middle column of the second resonant inductor L2 and the middle column of the fourth resonant inductor L2.

[0008] Furthermore, a first transformer middle column, a second transformer middle column, a first side column, and a second side column are further provided on the first top cover; the middle column of the first resonant inductor L2 and the middle column of the second resonant inductor L2 are located on the upper side of the side surface of the first top cover, and the first transformer middle column, the second transformer middle column, the middle column of the first resonant inductor L1, the middle column of the second resonant inductor L1, and the second transformer middle column are sequentially arranged on the lower side of the side surface of the first top cover, the first side column is arranged on the left side of the side surface of the first top cover, and the second side column is arranged on the right side of the side surface of the first top cover.

[0009] Furthermore, a third transformer middle column, a fourth transformer middle column, a third side column, and a fourth side column are further provided on the second top cover; the middle column of the third resonant inductor L2 and the middle column of the fourth resonant inductor L2 are located on the upper side of the side surface of the second top cover, and the third transformer middle column, the fourth transformer middle column, the middle column of the third resonant inductor L1, the middle column of the fourth resonant inductor L1, and the fourth transformer middle column are sequentially arranged on the lower side of the side surface of the second top cover, the third side column is arranged on the left side of the side surface of the second top cover, and the fourth side column is arranged on the right side of the side surface of the second top cover.

[0010] Furthermore, a first transformer primary winding and a second transformer primary winding are further included. The first transformer primary winding is wound around the first transformer middle column, the second transformer primary winding is wound around the third transformer middle column, and the first transformer primary winding is connected in series with the second transformer primary winding.

[0011] Further, it further includes a first transformer secondary winding and a second transformer secondary winding. The first transformer secondary winding surrounds the middle leg of the first transformer and the middle leg of the second transformer. The second transformer secondary winding surrounds the middle leg of the second transformer and the middle leg of the second resonance inductor L1. The first transformer secondary winding and the second transformer secondary winding are wound in parallel.

[0012] Further, it further includes a first resonance inductor L2 winding and a second resonance inductor L2 winding. The first resonance inductor L2 winding surrounds the middle leg of the third resonance inductor L2. The second resonance inductor L2 winding surrounds the middle leg of the fourth resonance inductor L2. The first resonance inductor L2 winding and the second resonance inductor L2 winding are wound in series.

[0013] Further, the winding directions of the primary winding of the first transformer, the secondary winding of the first transformer, and the first resonance inductor L2 winding are the same.

[0014] Further, the winding directions of the primary winding of the second transformer, the secondary winding of the second transformer, and the second resonance inductor L2 winding are the same.

[0015] Further, the primary winding of the first transformer, the secondary winding of the first transformer, the first resonance inductor L2 winding, the middle leg of the first transformer, the middle leg of the first resonance inductor L1, the middle leg of the first resonance inductor L2, the middle leg of the third transformer, and the middle leg of the third resonance inductor L2 form a group A magnetic structure, and the magnetic flux directions of the middle legs in the group A magnetic structure are all the same;

[0016] The primary winding of the second transformer, the secondary winding of the second transformer, the second resonance inductor L2 winding, the middle leg of the second transformer, the middle leg of the second resonance inductor L1, the middle leg of the second resonance inductor L2, the middle leg of the fourth transformer, and the middle leg of the fourth resonance inductor L2 form a group B magnetic structure, and the positive magnetic flux directions of the middle legs in the group B magnetic structure are all the same.

[0017] Further, the positive magnetic flux directions of the middle legs in the group A magnetic structure and the group B magnetic structure are opposite.

[0018] The present invention has the following beneficial effects:

[0019] When the all-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to the present invention is in specific operation, the middle column of the first resonant inductor L1 is spliced with the multi-segment middle column of the first resonant inductor L1 and the middle column of the third resonant inductor L1; the middle column of the second resonant inductor L1 is spliced with the multi-segment middle column of the second resonant inductor L1 and the middle column of the fourth resonant inductor L1; the middle column of the first resonant inductor L2 is spliced with the multi-segment middle column of the first resonant inductor L2 and the middle column of the third resonant inductor L2; the middle column of the second resonant inductor L2 is spliced with the multi-segment middle column of the second resonant inductor L2 and the middle column of the fourth resonant inductor L2. The columns of the resonant inductors L1 and L2 are each divided into multi-segment structures, and the inductance values of L1 and the resonant inductor L2 are respectively adjusted by adjusting the air gap, realizing the integration of one transformer and two resonant inductors. In the present invention, the multi-phase and multi-segment middle column structure spatially disperses the air gap of the inductive magnetic core, effectively reducing the diffusion magnetic flux area and the winding eddy current loss; in addition, the coupling of the magnetic core utilizes the time-domain waveform characteristics of the LCL resonant circuit, making the magnetic flux after coupling superposition smaller, thereby reducing the cross-sectional area of the common side column, reducing the volume of the magnetic core, and reducing the magnetic loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is an exploded view of the present invention;

[0022] Figure 2 is the front view of the present invention;

[0023] Figure 3 is the structural diagram of the upper magnetic core 10 of the transformer;

[0024] Figure 4 is the top view of the upper magnetic core 10 of the transformer;

[0025] Figure 5 is the structural diagram of the lower magnetic core 20 of the transformer;

[0026] Figure 6 is the distribution diagram of the windings in the present invention;

[0027] Figure 7 is the position diagram of the windings in the present invention;

[0028] Figure 8 is another exploded view of the present invention;

[0029] Figure 9a is the LCL circuit diagram based on discrete magnetic components;

[0030] Figure 9b is the circuit diagram of the integrated LCL circuit;

[0031] Figure 10 Waveform diagrams of the currents on the three coupled inductance windings after magnetic coupling;

[0032] Figure 11 Simulation result diagrams of the magnetic fluxes of the respective central columns and side columns in the integrated magnetic core;

[0033] Figure 12 Simulation result diagrams of the average magnetic flux densities of the respective central columns and side columns in the integrated magnetic core;

[0034] Figure 13 Magnetic flux density distribution diagram of the magnetic core under the worst working conditions.

[0035] Among them, 10 is the upper magnetic core of the transformer, 20 is the lower magnetic core of the transformer, 301 is the multi-segment central column of the first resonant inductor L1, 302 is the multi-segment central column of the second resonant inductor L1, 401 is the multi-segment central column of the first resonant inductor L2, 402 is the multi-segment central column of the second resonant inductor L2, 1011 is the central column of the first transformer, 1012 is the central column of the second transformer, 1021 is the central column of the first resonant inductor L1, 1022 is the central column of the second resonant inductor L1, 1031 is the central column of the first resonant inductor L2, 1032 is the central column of the second resonant inductor L2, 1041 is the first side column, 1042 is the second side column, 105 is the first top cover, 2011 is the central column of the third transformer, 2012 is the central column of the fourth transformer, 2021 is the central column of the third resonant inductor L1, 2022 is the central column of the fourth resonant inductor L1, 2031 is the central column of the third resonant inductor L2, 2032 is the central column of the fourth resonant inductor L2, 2041 is the third side column, 2042 is the fourth side column, 205 is the second top cover, 501 is the primary winding of the first transformer, 502 is the primary winding of the second transformer, 601 is the secondary winding of the first transformer, 602 is the secondary winding of the second transformer, 701 is the winding of the first resonant inductor L2, and 702 is the winding of the second resonant inductor L2. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0038] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0039] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent: the case where A exists alone, the case where A and B exist simultaneously, and the case where B exists alone. In addition, in the present invention, the character " / " generally represents an "or" relationship between the contextually related objects.

[0040] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0041] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0043] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where certain details are enlarged for the purpose of clear expression, and certain details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual requirements.

[0044] Referring Figures 1 to 8 , the all-in-one integrated magnetic core structure applicable to the LCL resonant cavity of the present invention includes an upper transformer core 10, a lower transformer core 20, a multi-segment middle column 301 of the first resonant inductor L1, a multi-segment middle column 302 of the second resonant inductor L1, a multi-segment middle column 401 of the first resonant inductor L2, a multi-segment middle column 402 of the second resonant inductor L2, a first primary winding 501 of the transformer, a second primary winding 502 of the transformer, a first secondary winding 601 of the transformer, a second secondary winding 602 of the transformer, a winding 701 of the first resonant inductor L2, and a winding 702 of the second resonant inductor L2;

[0045] The upper transformer core 10 includes a first top cover 105 and a first transformer middle column 1011, a second transformer middle column 1012, a first resonant inductor L1 middle column 1021, a second resonant inductor L1 middle column 1022, a first resonant inductor L2 middle column 1031, a second resonant inductor L2 middle column 1032, a first side column 1041, and a second side column 1042 on the first top cover 105; the first resonant inductor L2 middle column 1031 and the second resonant inductor L2 middle column 1032 are located on the upper side of the side surface of the first top cover 105, and the first transformer middle column 1011, the second transformer middle column 1012, the first resonant inductor L1 middle column 1021, the second resonant inductor L1 middle column 1022, and the second transformer middle column 1012 are sequentially arranged on the lower side of the side surface of the first top cover 105, the first side column 1041 is arranged on the left side of the side surface of the first top cover 105, and the second side column 1042 is arranged on the right side of the side surface of the first top cover 105.

[0046] The lower magnetic core 20 of the transformer includes a second top cover 205, and a third transformer middle column 2011, a fourth transformer middle column 2012, a third resonance inductor L1 middle column 2021, a fourth resonance inductor L1 middle column 2022, a third resonance inductor L2 middle column 2031, a fourth resonance inductor L2 middle column 2032, a third side column 2041 and a fourth side column 2042 on the second top cover 205; the third resonance inductor L2 middle column 2031 and the fourth resonance inductor L2 middle column 2032 are located on the upper side of the side surface of the second top cover 205, and the third transformer middle column 2011, the fourth transformer middle column 2012, the third resonance inductor L1 middle column 2021, the fourth resonance inductor L1 middle column 2022, and the fourth transformer middle column 2012 are sequentially arranged on the lower side of the side surface of the second top cover 205, the third side column 2041 is arranged on the left side of the side surface of the second top cover 205, and the fourth side column 2042 is arranged on the right side of the side surface of the second top cover 205.

[0047] The middle column formed by splicing the first resonance inductor L1 middle column 1021, the first resonance inductor L1 multi-section middle column 301 and the third resonance inductor L1 middle column 2021 forms 3 air gaps; the middle column formed by splicing the second resonance inductor L1 middle column 1022, the second resonance inductor L1 multi-section middle column 302 and the fourth resonance inductor L1 middle column 2022 forms 3 air gaps, where lg1 is the total length of the air gaps.

[0048] The middle column formed by splicing the first resonance inductor L2 middle column 1031, the first resonance inductor L2 multi-section middle column 401 and the third resonance inductor L2 middle column 2031 forms three air gaps; the middle column formed by splicing the second resonance inductor L2 middle column 1032, the second resonance inductor L2 multi-section middle column 402 and the fourth resonance inductor L2 middle column 2032 forms 3 air gaps, where the total length of the air gaps is lg2.

[0049] The primary winding 501 of the first transformer is wound around the first transformer middle column 1011, the primary winding 502 of the second transformer is wound around the third transformer middle column 2011, and the primary winding 501 of the first transformer is connected in series with the primary winding 502 of the second transformer.

[0050] The secondary winding 601 of the first transformer surrounds the first transformer middle column 1011 and the second transformer middle column 1012, the secondary winding 602 of the second transformer surrounds the second transformer middle column 1012 and the second resonance inductor L1 middle column 1022, and the secondary winding 601 of the first transformer and the secondary winding 602 of the second transformer are wound in parallel.

[0051] The first resonance inductor L2 winding 701 surrounds the third resonance inductor L2 middle column 2031, the second resonance inductor L2 winding 702 surrounds the fourth resonance inductor L2 middle column 2032, and the first resonance inductor L2 winding 701 and the second resonance inductor L2 winding 702 are wound in series.

[0052] The winding directions of the primary winding 501 of the first transformer, the secondary winding 601 of the first transformer, and the winding 701 of the first resonant inductor L2 are the same. The primary winding 501 of the first transformer, the secondary winding 601 of the first transformer, the winding 701 of the first resonant inductor L2, the central leg 1011 of the first transformer, the central leg 1021 of the first resonant inductor L1, the central leg 1031 of the first resonant inductor L2, the central leg 2011 of the third transformer, and the central leg 2031 of the third resonant inductor L2 form a group A magnetic structure. The magnetic flux directions of the central legs in the group A magnetic structure are all the same and are superimposed on the side legs.

[0053] The winding directions of the primary winding 502 of the second transformer, the secondary winding 602 of the second transformer, and the winding 702 of the second resonant inductor L2 are the same. The primary winding 502 of the second transformer, the secondary winding 602 of the second transformer, the winding 702 of the second resonant inductor L2, the central leg 1012 of the second transformer, the central leg 1022 of the second resonant inductor L1, the central leg 1032 of the second resonant inductor L2, the central leg 2012 of the fourth transformer, and the central leg 2032 of the fourth resonant inductor L2 form a group B magnetic structure. The positive directions of the magnetic fluxes of the central legs in the group B magnetic structure are all the same and are superimposed on the side legs.

[0054] The positive directions of the magnetic fluxes of the central legs in the group A magnetic structure and the group B magnetic structure are opposite.

[0055] The working principle of the present invention is as follows:

[0056] In the integrated magnetic structure of the present invention, there is a coupling relationship between windings, and the Figure 9a shown LCL resonant circuit can be equivalent to a three-inductor coupling model. Among them, the primary winding 501 of the first transformer and the primary winding 502 of the second transformer are connected in series to form an inductor Lcp1, the secondary winding 601 of the first transformer and the secondary winding 602 of the second transformer are connected in parallel to form an inductor Lcp2, and the winding 701 of the first resonant inductor L2 and the winding 702 of the second resonant inductor L2 are connected in series to form an inductor Lcp3. The corresponding inductance matrix L and coupling coefficient matrix K are respectively:

[0057]

[0058] Among them, L cp1,1 , L cp2,2 , L cp3,3 are the self-inductances of the inductor Lcp1, the inductor Lcp2, and the inductor Lcp3 respectively; M cp1,2 = M cp2,1 represents the mutual inductance between the inductor Lcp1 and the inductor Lcp2; M cp1,3 = M cp3,1 represents the mutual inductance between the inductor Lcp1 and the inductor Lcp3; M cp2,3 = M cp3,3represents the mutual inductance between inductors Lcp1 and Lcp3; k ij represents inductor L cpi and inductor L cpj the coupling coefficient between them.

[0059] In the present invention, the inductance value of the resonant inductor L1 can be calculated from the self - inductance and mutual inductance of inductors Lcp1 and Lcp2. When the turns ratio of the primary side to the secondary side is n:1, the inductance value of the resonant inductor L1 can be expressed as: L1 = L cp1,1 + n 2 L cp2,2 - 2nM cp1,2 .

[0060] In the integrated magnetic structure of the present invention, using the time - domain expressions of the currents of the two resonant inductors in the LCL resonant circuit, in the P - stage and N - stage of resonance, the time - domain expressions of the two resonant inductors are respectively:

[0061]

[0062] where h is the resonant inductor ratio, hl=(1 + 1 / h) 1 / 2 , M is the LCL resonator gain, i 10,n , i 20,n , v c0,n are the per - unit values of the initial value quantities of the resonant inductor L1, the resonant inductor L2, and the resonant capacitor at this resonant stage respectively, and θ is the per - unitized electrical angle.

[0063] The magnetic flux on the middle post of the resonant inductor is proportional to the current on the corresponding resonant inductor and inversely proportional to the number of turns of its winding. The instantaneous values of the magnetic flux on the middle post of each resonant inductor are respectively:

[0064]

[0065] where N1 and N2 are the total number of turns connected in series in the windings of the resonant inductor L1 and the resonant inductor L2 respectively.

[0066] In the integrated magnetic structure proposed by the present invention, the primary winding of the transformer is directly connected in parallel with the resonant capacitor. The magnetic flux on the middle post of the transformer depends on the volt - second product of the resonant capacitor voltage. The volt - second products in the P - stage and N - stage of resonance are as follows:

[0067]

[0068] The instantaneous value of the magnetic flux flowing through each middle post of the transformer is:

[0069]

[0070] After integration using the magnetic core structure shown in the present invention, the current time - domain waveforms of the three coupled inductor windings are as Figure 10as shown

[0071] In the integrated magnetic structure proposed by the present invention, the magnetic fluxes of the center columns of the transformers in the A-group magnetic structure and the B-group magnetic structure, the center column of the resonant inductor L1, and the center column of the resonant inductor L2 will be superimposed in the first side column 1041 and the second side column 1042 respectively according to a certain ratio. The magnetic flux waveforms in each center column and after being superimposed on the side columns are as Figure 11 shown; the peak value of the superimposed magnetic flux in the side column within one cycle is much smaller than the magnetic flux in the center column. The cross-sectional area of the side column can be taken to be much smaller than the area of the center column. The magnetic flux mainly circulates through the first top cover 105 and the second top cover 205 of the upper and lower magnetic cores. The symmetric magnetic core structure and the opposite positive directions of the center column magnetic fluxes of the A-group magnetic structure and the B-group magnetic structure enable the magnetic flux to make full use of the volume of the top cover magnetic core, reduce the peak value of the magnetic density in the magnetic core, and thus reduce the magnetic core loss. The time-domain waveforms of the magnetic flux density in each center column and side column and the magnetic density spatial distribution under the worst working conditions are respectively as Figure 12 and Figure 13 shown

[0072] Those skilled in the art will readily conceive of other embodiments of the present invention upon considering the specification and the disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims

[0073] It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims

[0074] The above are only the preferred embodiments of the present invention, and do not impose any limitation on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention

Claims

1. An all-in-one integrated magnetic core structure applicable to an LCL resonant cavity, characterized in that, It includes the upper magnetic core (10) of the transformer, the lower magnetic core (20) of the transformer, the multi-segment middle column (301) of the first resonant inductor L1, the multi-segment middle column (302) of the second resonant inductor L1, the multi-segment middle column (401) of the first resonant inductor L2, and the multi-segment middle column (402) of the second resonant inductor L2; the upper magnetic core (10) of the transformer includes the first top cover (105) and the middle column (1021) of the first resonant inductor L1, the middle column (1022) of the second resonant inductor L1, the middle column (1031) of the first resonant inductor L2, and the middle column (1032) of the second resonant inductor L2 on the first top cover (105); the lower magnetic core (20) of the transformer includes the second top cover (205) and the middle column (2021) of the third resonant inductor L1, the middle column (2022) of the fourth resonant inductor L1, the middle column (2031) of the third resonant inductor L2, and the middle column (2032) of the fourth resonant inductor L2 on the second top cover (205); The middle column (1021) of the first resonant inductor L1 is spliced with the multi-segment middle column (301) of the first resonant inductor L1 and the middle column (2021) of the third resonant inductor L1; the middle column (1022) of the second resonant inductor L1 is spliced with the multi-segment middle column (302) of the second resonant inductor L1 and the middle column (2022) of the fourth resonant inductor L1; the middle column (1031) of the first resonant inductor L2 is spliced with the multi-segment middle column (401) of the first resonant inductor L2 and the middle column (2031) of the third resonant inductor L2; the middle column (1032) of the second resonant inductor L2 is spliced with the multi-segment middle column (402) of the second resonant inductor L2 and the middle column (2032) of the fourth resonant inductor L2.

2. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 1, wherein The first top cover (105) is also provided with the first middle column (1011) of the transformer, the second middle column (1012) of the transformer, the first side column (1041), and the second side column (1042); the middle column (1031) of the first resonant inductor L2 and the middle column (1032) of the second resonant inductor L2 are located on the upper side of the side surface of the first top cover (105), and the first middle column (1011) of the transformer, the second middle column (1012) of the transformer, the middle column (1021) of the first resonant inductor L1, the middle column (1022) of the second resonant inductor L1, and the second middle column (1012) of the transformer are sequentially arranged on the lower side of the side surface of the first top cover (105), the first side column (1041) is arranged on the left side of the side surface of the first top cover (105), and the second side column (1042) is arranged on the right side of the side surface of the first top cover (105).

3. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 2, wherein The second top cover (205) is further provided with a third transformer middle column (2011), a fourth transformer middle column (2012), a third side column (2041) and a fourth side column (2042); the third resonant inductor L2 middle column (2031) and the fourth resonant inductor L2 middle column (2032) are located on the upper side of the side surface of the second top cover (205), and the third transformer middle column (2011), the fourth transformer middle column (2012), the third resonant inductor L1 middle column (2021), the fourth resonant inductor L1 middle column (2022), and the fourth transformer middle column (2012) are sequentially arranged on the lower side of the side surface of the second top cover (205), the third side column (2041) is arranged on the left side of the side surface of the second top cover (205), and the fourth side column (2042) is arranged on the right side of the side surface of the second top cover (205).

4. The multi-in-one integrated magnetic core structure applicable to an LCL resonant cavity according to claim 3, wherein It further includes a first transformer primary winding (501) and a second transformer primary winding (502). The first transformer primary winding (501) is wound around the first transformer middle column (1011), the second transformer primary winding (502) is wound around the third transformer middle column (2011), and the first transformer primary winding (501) is connected in series with the second transformer primary winding (502).

5. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 4, characterized in that, It further includes a first transformer secondary winding (601) and a second transformer secondary winding (602). The first transformer secondary winding (601) surrounds the first transformer middle column (1011) and the second transformer middle column (1012), the second transformer secondary winding (602) surrounds the second transformer middle column (1012) and the second resonant inductor L1 middle column (1022), and the first transformer secondary winding (601) and the second transformer secondary winding (602) are wound in parallel.

6. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 5, characterized in that, It further includes a first resonant inductor L2 winding (701) and a second resonant inductor L2 winding (702). The first resonant inductor L2 winding (701) surrounds the third resonant inductor L2 middle column (2031), the second resonant inductor L2 winding (702) surrounds the fourth resonant inductor L2 middle column (2032), and the first resonant inductor L2 winding (701) and the second resonant inductor L2 winding (702) are wound in series.

7. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 6, characterized in that, The winding directions of the first transformer primary winding (501), the first transformer secondary winding (601) and the first resonant inductor L2 winding (701) are the same.

8. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 6, characterized in that, The winding directions of the second transformer primary winding (502), the second transformer secondary winding (602) and the second resonant inductor L2 winding (702) are the same.

9. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 6, wherein, The first transformer primary winding (501), the first transformer secondary winding (601), the first resonant inductor L2 winding (701), the first transformer middle column (1011), the first resonant inductor L1 middle column (1021), the first resonant inductor L2 middle column (1031), the third transformer middle column (2011) and the third resonant inductor L2 middle column (2031) form a group A magnetic structure, and the magnetic flux directions of the middle columns in the group A magnetic structure are all the same; The primary winding (502) of the second transformer, the secondary winding (602) of the second transformer, the winding (702) of the second resonant inductor L2, the center leg (1012) of the second transformer, the center leg (1022) of the second resonant inductor L1, the center leg (1032) of the second resonant inductor L2, the center leg (2012) of the fourth transformer, and the center leg (2032) of the fourth resonant inductor L2 form the magnetic structure of Group B, and the positive directions of the magnetic fluxes of the center legs in the magnetic structure of Group B are the same.

10. The multi-in-one integrated magnetic core structure applicable to the LCL resonant cavity according to claim 9, characterized in that, The positive directions of the magnetic fluxes of the center legs in the magnetic structure of Group A are opposite to those in the magnetic structure of Group B.

Images