Resonant inductor integrated LLC transformer

Abstract

The invention relates to the technical field of transformers, in particular to a resonant inductor integrated LLC transformer which comprises a base, a magnetic core, a coil and end magnetic blocks, the magnetic core, the coil and the end magnetic blocks are installed on the base, the magnetic core is installed in the coil, the two ends of the magnetic core abut against the end magnetic blocks, and the coil is wound around the magnetic core and is a multi-layer lap winding. The coil comprises a primary side coil located in the middle and secondary side coils located on the two sides of the primary side coil, partition plates are arranged between the primary side coil and the secondary side coils and used for coil isolation, and a magnetic core is arranged in the winding to form a path and play a role of a resonant inductor. The LLC transformer does not need to be additionally provided with a winding of a resonant inductor, so that the size of the LLC transformer is reduced, the structure is simplified, the processing difficulty is reduced, and the power density is increased.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a resonant inductor integrated LLC transformer. Background Art

[0002] Most of the existing LLC transformers are composed of a resonant inductor winding and a transformer, and the resonant inductor winding and the transformer are two independent devices.

[0003] The current social development trend is that electronic equipment is becoming increasingly miniaturized, integrated, and thinner. The traditional LLC transformer has a relatively large volume because its resonant inductor winding and transformer are two independent components, which does not meet the increasingly compact design space.

[0004] Therefore, it is necessary to design an LLC transformer that can meet current design requirements. Summary of the invention

[0005] In order to solve the above problems, the resonant inductor integrated LLC transformer provided by the present invention integrates the resonant inductor into the transformer, thereby reducing the overall volume, simplifying the structure, and making the processing easier.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A resonant inductor integrated LLC transformer comprises a base and a magnetic core, a coil, a winding frame and an end magnetic block installed on the base, wherein the magnetic core is installed in the coil and its two ends are abutted against the end magnetic blocks, the coil is wound on the magnetic core and is a multi-layer stacked winding, the coil comprises a primary coil located in the middle and secondary coils located on both sides of the primary coil, the bottom of the base is provided on the winding frame and the edge is provided with multiple mounting ends for connecting the coil, the winding frame is provided with multiple winding sections, and partitions are provided on both sides of each winding section for winding isolation.

[0007] Optionally, in one embodiment of the present invention, the coil is a three-layer winding wound with round copper wire.

[0008] Optionally, in one embodiment of the present invention, the magnetic core is a tubular structure, and the magnetic core is composed of a plurality of block-shaped ferrites of the same shape and size. Concave arc-shaped openings are respectively provided on both sides of the width direction of the magnetic core, and the arc-shaped openings and the inner wall of the winding frame constitute heat dissipation holes.

[0009] Optionally, in an embodiment of the present invention, the base includes a mounting area in the middle and pin portions located on both sides of the mounting area, the pin portions are higher than the mounting area, and the mounting area is a U-shaped groove structure.

[0010] Optionally, in one embodiment of the present invention, the mounting portion is a hollow structure for saving raw materials and facilitating heat dissipation.

[0011] Optionally, in one embodiment of the present invention, the end magnetic block is in a C-shaped structure, and avoidance openings are provided on both sides of the waist of the end magnetic block, and the avoidance openings correspond to the positions of the heat dissipation holes to facilitate internal heat dissipation.

[0012] Optionally, in one embodiment of the present invention, the inner wall of the winding frame is provided with a plurality of protruding support portions, and the support portions abut against the surface of the magnetic core so that a gap is retained between the magnetic core and the inner wall of the winding frame for heat dissipation.

[0013] Optionally, in one embodiment of the present invention, a limiting portion protruding outward is provided on the partition, and the limiting portion abuts against the end magnetic block to stabilize the winding frame.

[0014] Optionally, in one embodiment of the present invention, spacers are provided at the edges of adjacent ferrites to reserve gaps between adjacent ferrites.

[0015] Optionally, in one embodiment of the present invention, a magnetic ring is provided on the inner side of the partition between the primary coil and the secondary coil, and the magnetic ring is embedded and installed between the partition between the primary coil and the secondary coil.

[0016] Beneficial effects of the present invention The resonant inductor integrated LLC transformer of the present invention has a magnetic core arranged in the coil winding to form a magnetic path, thereby playing the role of a resonant inductor, thereby eliminating the original resonant inductor structure, reducing the size of the LLC transformer, and improving the power density. In addition, the structure of the resonant inductor is eliminated, which reduces the processing difficulty and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Figure 1 It is a three-dimensional schematic diagram of an LLC transformer according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of an LLC transformer according to Embodiment 1 of the present invention; Figure 3 It is a cross-sectional view in the length direction of the LLC transformer of Embodiment 1 of the present invention; Figure markings: base 1, pin 101, mounting end 102, mounting area 103, end magnetic block 2, avoidance opening 201, winding frame 3, partition 301, support portion 302, primary coil 4, secondary coil 5, heat dissipation hole 6, magnetic core 7, arc-shaped opening 701, spacer 702, magnetic ring 703. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. Example 1

[0026] In order to meet the current social demand for miniaturization, integration, and lightweight design of electronic appliances, a resonant inductor integrated LLC transformer is designed. The specific solution is as follows: like Figure 1-3 As shown, a resonant inductor integrated LLC transformer includes a base 1 and a magnetic core 7 installed on the base 1, a coil, a winding frame 3 and an end magnetic block 2, the magnetic core 7 is installed in the coil and both ends are abutted against the end magnetic block 2, the coil is wound on the magnetic core 7 and the coil is a multi-layer stacked winding, the coil includes a primary coil 4 located in the middle and secondary coils 5 located on both sides of the primary coil 4, the bottom of the base 1 is provided on the winding frame 3, and the edge is provided with multiple mounting ends 102 for connecting the coil, and a plurality of winding sections are provided on the winding frame 3, and partitions 301 are provided on both sides of each winding section for winding isolation.

[0027] In this embodiment, the ferrite is manganese-zinc ferrite. In other solutions, manganese-zinc ferrite made of other materials may also be used.

[0028] The coil is a three-layer winding made of round copper wire.

[0029] In this embodiment, the primary coil 4 is wound on the winding frame 3 with three layers and four turns, and the secondary coil 5 is wound on the winding frame 3 with three layers and two turns.

[0030] The magnetic core 7 is a tubular structure, and is composed of a plurality of ferrite blocks of the same shape and size. Concave arc openings 701 are respectively provided on both sides of the width direction of the magnetic core 7, and the arc openings 701 and the inner wall of the winding frame 3 form heat dissipation holes 6.

[0031] In this embodiment, the heat dissipation hole 6 is in a shuttle shape, and the heat dissipation hole 6 is a hole that passes through from left to right, and the internal heat can be directly dissipated into the air.

[0032] The base 1 includes a mounting area 103 in the middle and pins 101 located on both sides of the mounting area 103 . The pins 101 are higher than the mounting area 103 . The mounting area 103 is in a U-shaped groove structure.

[0033] Specifically, the width of the U-shaped groove is equivalent to the width of the end magnetic block 2 , and the length of the U-shaped groove is equivalent to the length of the two end magnetic blocks 2 .

[0034] The mounting portion is a hollow structure. While ensuring the structural strength of the base 1, the mounting portion opens a cross-shaped hollow structure on the base 1 to save raw materials and facilitate heat dissipation.

[0035] The end magnetic block 2 is in a C-shaped structure, and two sides of the waist of the end magnetic block 2 are provided with avoidance openings 201 , which correspond to the positions of the heat dissipation holes 6 to facilitate internal heat dissipation.

[0036] Specifically, after the end magnetic blocks 2 on both sides are spliced ​​together, they are in the shape of a U when viewed from the length direction. The middle inner part of the end magnetic block 2 abuts against the two ends of the magnetic core 7 respectively, and the upper inner wall and the lower inner wall of the end magnetic block 2 abut against the upper edge and the lower edge of the partition 301 respectively, so that the coil can be stably installed in the end magnetic block 2.

[0037] The inner wall of the winding frame 3 is provided with a plurality of protruding support parts 302 , which abut against the surface of the magnetic core 7 , so that a gap is reserved between the magnetic core 7 and the inner wall of the winding frame 3 for heat dissipation.

[0038] A gap is reserved between the magnetic core 7 and the inner wall of the winding frame 3 to facilitate the flow of internal air, help dissipate heat, and facilitate the stable operation of the LLC transformer.

[0039] The partition plate 301 is provided with a limiting portion protruding outward, and the limiting portion abuts against the end magnetic block 2 to stabilize the winding frame 3.

[0040] Spacers 702 are provided at the edges of adjacent ferrites to keep gaps between adjacent ferrites.

[0041] In this embodiment, the spacer 702 is a non-continuous arc-shaped spacer 702 , which is separated at the arc-shaped opening 701 to avoid the heat in the ferrite from there to the heat dissipation hole 6 .

[0042] A magnetic ring 703 is provided inside the partition plate 301 between the primary coil 4 and the secondary coil 5 . The magnetic ring 703 is embedded and installed between the primary coil 4 and the partition plate 301 between the secondary coil 5 .

[0043] Specifically, an annular groove is provided in the partition 301 between the primary coil 4 and the secondary coil 5, and the magnetic ring 703 can be installed in the annular groove. The inner diameter of the magnetic ring 703 is equivalent to the inner diameter of the winding frame 3. During assembly, the magnetic ring 703 can be inserted from the gap between the partitions 301.

[0044] The resonant inductor integrated LLC transformer of the present invention adopts a magnetic core 7 at the position of the transformer core, thereby forming a magnetic path to play the role of a resonant inductor. The resonant inductor as an independent structure in the original design is cancelled, so that the overall volume of the LLC transformer is reduced to meet a more compact installation space and meet the current market development needs. In addition, due to the simplified structure, the processing difficulty is reduced, the production and assembly are simpler, and the production efficiency is improved. In the structural design of the transformer, a connected heat dissipation space is designed for the installation position of the magnetic core 7, so that the magnetic core 7 can dissipate heat well, thereby ensuring the stable operation of the LLC transformer. Example 2

[0045] In this embodiment, the LLC transformer structure is basically the same as that of Embodiment 1, except that the original magnetic core 7 is divided into two magnetic cores 7 of equal length, and the magnetic core 7 and the end magnetic block 2 on the corresponding side are an integral structure. The LLC transformer of this scheme can be assembled faster in the subsequent assembly process.

[0046] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A resonant inductor integrated LLC transformer, characterized in that: It includes a base and a magnetic core, a coil, a winding frame and an end magnetic block installed on the base. The magnetic core is installed in the coil and its two ends are abutted against the end magnetic blocks. The coil is wound on the magnetic core and is a multi-layer stacked winding. The coil includes a primary coil located in the middle and secondary coils located on both sides of the primary coil. The bottom of the base is provided on the winding frame. The edge is provided with multiple mounting ends for connecting the coil. The winding frame is provided with multiple winding sections. Both sides of each winding section are provided with partitions for winding isolation.

2. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The coil is a three-layer winding made of round copper wire.

3. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The magnetic core is a tubular structure, and is composed of a plurality of ferrite blocks of the same shape and size. Concave arc openings are respectively provided on both sides of the width direction of the magnetic core, and the arc openings and the inner wall of the winding frame form heat dissipation holes.

4. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The base comprises a mounting area in the middle and pin portions located at both sides of the mounting area. The pin portions are higher than the mounting area, and the mounting area is in a U-shaped groove structure.

5. The resonant inductor integrated LLC transformer according to claim 4, characterized in that: The mounting portion is a hollow structure, which is used to save raw materials and facilitate heat dissipation.

6. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The end magnetic block is in a C-shaped structure, and avoidance openings are provided on both sides of the waist of the end magnetic block. The avoidance openings correspond to the positions of the heat dissipation holes, which facilitates internal heat dissipation.

7. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The inner wall of the winding frame is provided with a plurality of protruding support parts, and the support parts abut against the surface of the magnetic core so that a gap is reserved between the magnetic core and the inner wall of the winding frame for heat dissipation.

8. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: The partition is provided with a limiting portion protruding outward, and the limiting portion abuts against the end magnetic block to stabilize the winding frame.

9. The resonant inductor integrated LLC transformer according to claim 3, characterized in that: Spacers are provided at the edges of adjacent ferrites to reserve gaps between adjacent ferrites.

10. The resonant inductor integrated LLC transformer according to claim 1, characterized in that: A magnetic ring is provided inside the partition between the primary coil and the secondary coil, and the magnetic ring is embedded and installed between the partition between the primary coil and the secondary coil.

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