Resonant transformer

Abstract

The utility model relates to a resonance transformer. The resonant transformer comprises a magnetic core set, the magnetic core set comprises a first magnetic core and a second magnetic core which are oppositely arranged, the first magnetic core is provided with a first containing cavity, the second magnetic core is provided with a second containing cavity, and the first containing cavity and the second containing cavity are opposite to form a containing space; the magnetic column group is arranged in the accommodating space and constructs the accommodating space into an annular space; and the magnetic ring divides the annular space into a first subspace for accommodating the primary coil and a second subspace for accommodating the secondary coil, and the magnetic conductivity of the magnetic ring is lower than that of the magnetic core group. According to the resonant transformer provided by the utility model, the magnetic ring with low magnetic conductivity is arranged between the primary coil and the secondary coil, so that the sensing value requirement can be met without adjusting the size of an air gap, the assembly is simple, and the precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a resonant transformer. Background Art

[0002] Electronic transformers are widely used as core devices for power conversion in the electronic industry, such as inverters and ballasts. With the popularization of applications and the requirements for greening and environmental protection, the requirements for conversion efficiency are getting higher and higher. A resonant transformer is a special transformer that uses the resonance phenomenon to achieve energy transmission. Generally, a resonant transformer consists of two mutually coupled coils, which are called the primary coil and the secondary coil. When the AC power supply in the primary coil is excited, the magnetic field generated will be induced into the secondary coil, and the energy requirements output to the load can be met by adjusting the resonant operating frequency.

[0003] There are some technical and safety challenges in the practical application of resonant transformers, which require comprehensive consideration of factors such as design, power transmission efficiency, and electromagnetic radiation. However, the uneven magnetic field density of resonant transformers in traditional technologies affects energy conversion. Utility Model Content

[0004] Based on this, it is necessary to provide a resonant transformer to address the problem of uneven magnetic field density in traditional transformers.

[0005] The utility model provides a resonant transformer, the resonant transformer comprising:

[0006] The magnetic core group comprises a first magnetic core and a second magnetic core arranged opposite to each other, the first magnetic core has a first accommodating cavity, the second magnetic core has a second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are opposite to each other to form an accommodating space;

[0007] A magnetic column group is arranged in the accommodation space, and the accommodation space is constructed as an annular space; and

[0008] The magnetic ring divides the annular space into a first subspace for accommodating the primary coil and a second subspace for accommodating the secondary coil, and the magnetic permeability of the magnetic ring is lower than the magnetic permeability of the magnetic core group.

[0009] In one embodiment, the magnetic permeability of the magnetic ring is determined according to the leakage inductance between the primary coil and the secondary coil. This arrangement makes the magnetic field distribution of the resonant transformer more uniform.

[0010] In one embodiment, the magnetic ring includes a separable first magnetic ring and a second magnetic ring. The first magnetic ring and the second magnetic ring can be combined or separated. When combined, they are assembled and sleeved on the magnetic column group. When separated, they can be disassembled to facilitate assembly and removal. In addition, the first magnetic ring and the second magnetic ring can be assembled by snap-fitting to ensure stable assembly.

[0011] In one embodiment, the first magnetic core is provided with a positioning groove for accommodating the magnetic ring in the first accommodating cavity, and the second magnetic core is provided with a positioning protrusion for supporting the magnetic ring in the second accommodating cavity, and the positions of the positioning groove and the positioning protrusion are opposite. The positioning groove located in the first magnetic core limits its left and right displacement, so that its position is fixed, and the positioning protrusion located in the second magnetic core supports the magnetic ring and limits its longitudinal movement.

[0012] In one embodiment, the depth of the positioning groove is equal to the height of the positioning protrusion. When the height of the magnetic ring is equal to the height of the accommodation space formed by the first accommodation cavity and the second accommodation cavity, the depth of the positioning groove is equal to the height of the positioning protrusion, which can cooperate to limit the magnetic ring.

[0013] In one embodiment, the area between the magnetic ring and the magnetic column group is the first subspace, which is used to accommodate the primary coil; the area between the magnetic ring and the inner wall of the magnetic core group is the second subspace, which is used to accommodate the secondary coil.

[0014] In one embodiment, a first opening is provided on the side of the magnetic core group, and the first opening extends inward at least to the magnetic column group, and the first opening is used to provide a space for the primary coil and the secondary coil, so that the primary coil and / or the secondary coil can pass through the first opening, and is convenient for electrical connection with external devices.

[0015] In one embodiment, the width of the first opening increases in the direction outward from the magnetic column group. In this way, the first opening forms a cone, and the outer opening is larger than the inner opening, thereby improving the flexibility of the primary coil and the secondary coil and facilitating the adjustment of their positions.

[0016] In one embodiment, the magnetic ring is provided with a second opening. The second opening can prevent the magnetic ring from interfering with or colliding with other components during assembly, thereby improving assembly safety. The second opening can extend along the magnetic ring, such as the second opening can penetrate the magnetic ring in the height direction of the magnetic ring, or penetrate the magnetic ring in the thickness direction of the magnetic ring. Alternatively, the second opening can be partially opened in the height direction or thickness direction of the magnetic ring without penetrating. In addition, the number of the second openings can be one or more, determined according to the position and number of components that may interfere during the assembly of the magnetic ring.

[0017] In one embodiment, the first magnetic core and the second magnetic core are both cylindrical, and the first accommodating cavity and the second accommodating cavity are both cylindrical. When the magnetic column group is placed in the accommodating space formed by the first accommodating cavity and the second accommodating cavity, the accommodating space is divided into an annular space centered on the magnetic column group. Furthermore, the magnetic column group can be located at the center of the cylinder, and the annular space formed at this time takes the magnetic column group as the center, which is convenient for coil winding.

[0018] In one embodiment, the magnetic column group includes a first magnetic column and a second magnetic column that are arranged opposite to each other, the first magnetic column is arranged in the first receiving cavity and connected to the first magnetic core, and the second magnetic column is arranged in the second receiving cavity and connected to the second magnetic core. When the magnetic column group is placed in the receiving space, the receiving space is divided into an annular space centered on the magnetic column group. Furthermore, the magnetic column group can be located at the center of the cylinder, and the annular space formed at this time takes the magnetic column group as the center, which is convenient for coil winding.

[0019] In one embodiment, the relative magnetic permeability of the magnetic core group is 700-4000, and the relative magnetic permeability of the magnetic ring is 5-150.

[0020] In the above-mentioned resonant transformer, the magnetic core group includes a first magnetic core and a second magnetic core arranged oppositely, a first accommodating cavity of the first magnetic core and a second accommodating cavity of the second magnetic core form an accommodating space, a magnetic column group is arranged in the accommodating space, and a magnetic ring is sleeved on the magnetic column group. The first subspace and the second subspace formed by the magnetic ring are used to accommodate the primary coil and the secondary coil respectively. By arranging a magnetic ring with low magnetic permeability between the primary coil and the secondary coil, the inductance requirement can be met without adjusting the air gap size, and the assembly is simple and the precision is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the structure of a resonant transformer in one embodiment;

[0022] FIG2 is a cross-sectional view of a resonant transformer in one embodiment;

[0023] FIG3 is a schematic diagram of the positional relationship between the primary coil and the secondary coil in one embodiment;

[0024] FIG4 is a simulation diagram of magnetic field distribution of a resonant transformer in one embodiment;

[0025] FIG5 is a schematic diagram of the structure of a resonant transformer in conventional technology;

[0026] FIG6 is a schematic diagram of the structure of a resonant transformer in another embodiment;

[0027] FIG7 is a schematic structural diagram of a first magnetic core in one embodiment;

[0028] FIG. 8 is a schematic diagram of the structure of a second magnetic core in one embodiment.

[0029] Explanation of the accompanying drawings: 100, magnetic core group; 110, first magnetic core; 120, second magnetic core; 130, first opening; 200, magnetic column group; 210, first magnetic column; 220, second magnetic column; 300, magnetic ring; 310, first subspace; 320, second subspace; 400, upper magnetic core; 500, lower magnetic core; S1, first accommodating cavity; S2, second accommodating cavity; S3, air gap; P1, primary coil; P2, secondary coil. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model 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 utility model. However, the utility model 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 utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0031] 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 a limitation on the present invention.

[0032] 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 utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] 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.

[0034] In the present utility model, 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.

[0035] 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.

[0036] A resonant transformer is a device that uses the principle of a resonant circuit to achieve energy transmission and conversion. The resonant transformer is mainly composed of two coils (i.e., the primary coil and the secondary coil) and a capacitor connected to them. The primary coil and the secondary coil have an inductor and a magnetic core respectively, which achieve energy transmission and conversion through magnetic coupling. In a resonant transformer, the primary coil and the secondary coil are connected to form a resonant circuit through a capacitor. When using a resonant transformer, the output can be adjusted by adjusting the operating frequency of the resonant circuit.

[0037] Leakage inductance in a resonant transformer refers to the incomplete mutual inductance between the primary coil and the secondary coil, which causes a portion of the magnetic field lines to not be fully coupled to the secondary coil, but to leak into the surrounding space or other parts. Large leakage inductance will lead to energy transmission loss and reduced efficiency. In order to reduce the impact of leakage inductance on the performance of the resonant transformer, the present application proposes a resonant transformer, which adds magnetic rings to the primary coil and the secondary coil to make the magnetic field distribution uniform.

[0038] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of a resonant transformer in an embodiment of the utility model. A resonant transformer provided in an embodiment of the utility model includes a magnetic core group 100, a magnetic column group 200 and a magnetic ring 300, wherein the magnetic core group 100 has a receiving space inside, the magnetic column group 200 is arranged in the receiving space inside the magnetic core group 100, and the magnetic ring 300 is annular and sleeved on the magnetic column group 200. When a coil is added to the resonant transformer, the magnetic ring 300 is located between the primary coil and the secondary coil, so that the magnetic coupling between the primary winding and the secondary winding is reduced, and the leakage inductance between the primary coil and the secondary coil is increased, so that the magnetic field density is more uniform.

[0039] Specifically, the magnetic core group 100 includes a first magnetic core 110 and a second magnetic core 120 that are arranged opposite to each other. The first magnetic core 110 has a space inside to form a first accommodation cavity S1, and the second magnetic core has a space inside to form a second accommodation cavity S2. When the first magnetic core 110 and the second magnetic core 120 are arranged opposite to each other, the first accommodation cavity S1 and the second accommodation cavity S2 are also arranged opposite to each other, so that the first accommodation cavity S1 and the second accommodation cavity S2 are opposite to each other to form an accommodation space.

[0040] When the magnetic column group 200 is arranged in the accommodation space formed by the magnetic core group 100, since the accommodation space is an integral space, after the magnetic column group 200 is added, the accommodation space is constructed into an annular space with the magnetic column group 200 as the center, and the annular space is used to accommodate the magnetic ring 300 and the winding coil.

[0041] As shown in FIG2 , FIG2 shows a cross-sectional view of a resonant transformer in an embodiment. At this time, the magnetic ring 300 is sleeved on the magnetic column group 200 and has a certain distance from the magnetic column group 200. Since the annular magnetic ring 300 is accommodated in the annular space, the annular space is divided into a first subspace 310 located inside the magnetic ring 300 and a second subspace 320 located outside the magnetic ring 300. Schematically, the magnetic ring 300 can be made of a metal magnetic powder core with low magnetic permeability.

[0042] Referring to Figures 2 and 3 at the same time, Figure 3 shows a schematic diagram of the positional relationship between the primary coil P1 and the secondary coil P2 in one embodiment. Optionally, the area between the magnetic ring 300 and the magnetic column group 200 is a first subspace 310 for accommodating the primary coil P1; the area between the magnetic ring 300 and the inner wall of the magnetic core group 100 is a second subspace 320 for accommodating the secondary coil P2.

[0043] In this embodiment, the magnetic permeability of the magnetic ring 300 is lower than that of the magnetic core group 100. Magnetic permeability is a physical quantity that describes the material's ability to respond to a magnetic field, and represents the ratio of the material's magnetic induction intensity to the magnetic field intensity under a given magnetic field. The magnetic permeability of the magnetic ring 300 is lower than that of the magnetic core group 100, and the inductance requirement can be met without adjusting the size, making the magnetic field density more uniform.

[0044] As shown in FIG. 4 , FIG. 4 shows a simulation diagram of the magnetic field distribution of a resonant transformer in an embodiment. FIG. 4 shows that the magnetic flux density in the magnetic core is more uniform, and the scattered magnetic flux in the air is also reduced, which can greatly reduce the line loss. The ratio of ACR (Alternating Current Resistance, AC internal resistance) to DCR (Direct Current Resistance, DC internal resistance) can characterize the line loss. As shown in FIG. 5 , FIG. 5 shows a schematic diagram of the structure of a resonant transformer in conventional technology, including an upper magnetic core 400 and a lower magnetic core 500, wherein the upper magnetic core 400 and the lower magnetic core 500 have relative protrusions, and when the upper magnetic core 400 and the lower magnetic core 500 are combined, the protrusions are close, and there is an air gap between the two protrusions, and the leakage inductance is increased by the air gap. In the simulation, compared with the resonant transformer of conventional technology, when the operating frequency is 100K, the ACR / DCR value of the resonant transformer provided in this embodiment after adding the magnetic ring 300 is 6.5%, and the ACR / DCR value of the resonant transformer without adding the magnetic ring in conventional technology is 12%, indicating that the line loss is significantly reduced. In addition, when the operating frequency is 200K, the ACR / DCR value is 48% when the magnetic ring 300 is not added, and the ACR / DCR value is 25.6% when the magnetic ring 300 is added; when the operating frequency is 300K, the ACR / DCR value is 108% when the magnetic ring 300 is not added, and the ACR / DCR value is 58.2% when the magnetic ring 300 is added, indicating that adding the magnetic ring 300 can effectively reduce the line loss.

[0045] In the above-mentioned resonant transformer, the magnetic core group 100 includes a first magnetic core 110 and a second magnetic core 120 arranged oppositely, the first accommodating cavity S1 of the first magnetic core 110 and the second accommodating cavity S2 of the second magnetic core 120 form an accommodating space, the magnetic column group 200 is arranged in the accommodating space, and the magnetic ring 300 is sleeved on the magnetic column group 200. The first subspace 310 and the second subspace 320 formed by the magnetic ring 300 are used to accommodate the primary coil and the secondary coil respectively. By arranging a magnetic ring with low magnetic permeability between the primary coil and the secondary coil, the inductance requirement can be met without adjusting the air gap size, and the assembly is simple and the precision is high.

[0046] Optionally, in order to facilitate the assembly of the primary coil P1 and the secondary coil P2, the first magnetic core 110 and the second magnetic core 120 are both cylindrical, and the first accommodating cavity S1 and the second accommodating cavity S2 are both cylindrical. When the magnetic column group 200 is placed in the accommodating space formed by the first accommodating cavity S1 and the second accommodating cavity S2, the accommodating space is divided into an annular space centered on the magnetic column group 200. Furthermore, the magnetic column group 200 can be located at the center of the cylinder, and the annular space formed at this time takes the magnetic column group as the center, which is convenient for coil winding.

[0047] In an exemplary embodiment, referring to FIG. 6 , FIG. 6 shows a schematic diagram of the structure of a resonant transformer in another embodiment. The magnetic ring 300 includes a separable first magnetic ring 310 and a second magnetic ring 320. The first magnetic ring 310 and the second magnetic ring 320 can be combined or separated. When combined, they are combined and sleeved on the magnetic column group 200. When separated, they can be disassembled for easy assembly and removal. Schematically, the first magnetic ring 310 and the second magnetic ring 320 can be assembled by snap-fitting so that the two are combined to form a whole.

[0048] Optionally, the first magnetic ring 310 can be assembled with the first magnetic core 110 first, and the second magnetic ring 320 can be assembled with the second magnetic core 120, and then the first magnetic core 110 and the second magnetic core 120 are assembled relative to each other so that the first magnetic ring 310 and the second magnetic ring 320 are assembled in contact.

[0049] Referring to Fig. 7 and Fig. 8, Fig. 7 shows a schematic diagram of the structure of the first magnetic core 110 in one embodiment, and Fig. 8 shows a schematic diagram of the structure of the second magnetic core 120 in one embodiment. In order to determine the position of the magnetic ring 300, in an exemplary embodiment, the first magnetic core 110 is provided with a positioning groove 111 for accommodating the magnetic ring 300 in the first accommodating cavity S1, and the second magnetic core 120 is provided with a positioning protrusion 121 for supporting the magnetic ring 300 in the second accommodating cavity S2, and the positions of the positioning groove 111 and the positioning protrusion 121 are relative.

[0050] When the magnetic ring 300 is set in the positioning groove 111 of the first magnetic core 110, the positioning groove 111 limits its left and right displacement, so that its position is fixed. However, the setting of the positioning groove 111 makes the magnetic ring 300 deviate toward the first magnetic core 110, and it is easy to move longitudinally, while the positioning protrusion 121 located on the second magnetic core 120 supports the magnetic ring 300 and limits its longitudinal movement. Through the cooperation of the positioning protrusion 121 and the positioning groove 111, the position of the magnetic ring 300 is fixed.

[0051] In addition, when the magnetic ring 300 includes the first magnetic ring 310 and the second magnetic ring 320, the first magnetic ring 310 and the second magnetic ring 320 are assembled to form the magnetic ring 300. The first magnetic core 110 is provided with a positioning groove 111 in the first accommodating cavity S1 for accommodating one of the first magnetic ring 310 and the second magnetic ring 320, and the second magnetic core 120 is provided with a positioning protrusion 121 in the second accommodating cavity S2 for supporting the other of the first magnetic ring 310 and the second magnetic ring 320, and the positions of the positioning groove 111 and the positioning protrusion 121 are opposite. During assembly, the first magnetic ring 310 is first placed in the positioning groove 111, and the position of the second magnetic ring 320 is determined based on the position of the first magnetic ring 310, and the second magnetic ring 320 is supported by the positioning protrusion 121, so that the first magnetic ring 310 and the second magnetic ring 320 are connected.

[0052] Generally, the height of the magnetic ring 300 is equal to the height of the accommodation space formed by the first accommodation cavity S1 and the second accommodation cavity S2, so that the magnetic ring 300 can contact the first magnetic core 110 and the second magnetic core 120 respectively from top to bottom.

[0053] When there is a positioning groove 111, the positioning groove 111 accommodates a magnetic ring 300 of a certain height. In a feasible implementation, the depth of the positioning groove 111 is equal to the height of the positioning protrusion 121. At this time, the height of the magnetic ring 300 accommodated by the positioning groove 111 is consistent with the height of the positioning protrusion 121. When the first magnetic ring 310 and the second magnetic ring 320 are in contact, the magnetic ring 300 formed can contact the first magnetic core 110 and the second magnetic core 120 respectively. When the height of the magnetic ring 300 is fixed, the depth of the positioning groove 111 and the height of the positioning protrusion 121 are equal, and the magnetic ring 300 can be limited in position.

[0054] 7 and 8, in an exemplary embodiment, the magnetic column group 200 includes a first magnetic column 210 and a second magnetic column 220 that are arranged opposite to each other, the first magnetic column 210 is arranged in the first accommodating cavity S1 and connected to the first magnetic core 110, and the second magnetic column 220 is arranged in the second accommodating cavity S2 and connected to the second magnetic core 120. In this embodiment, the magnetic column group 210 can also be separated.

[0055] Optionally, the magnetic column group 200 can be divided into a first magnetic column 210 and a second magnetic column 220 that are arranged opposite to each other (see Figures 6 and 7), the first magnetic column 210 is fixed in the first accommodating cavity S1, and the second magnetic column 220 is fixed in the second accommodating cavity S2, and when the first magnetic core 110 and the second magnetic core 120 are relatively coordinated, the first magnetic column 210 and the second magnetic column 220 are opposite to each other. This arrangement makes it easy to disassemble the resonant transformer as a whole and facilitates the assembly of the primary coil P1 and the secondary coil P2.

[0056] Referring to FIGS. 1 to 3 , in one embodiment, the side of the magnetic core group 100 has a first opening 130, which extends inward at least to the magnetic column group 200. The first opening 130 is used to provide a space for the primary coil P1 and the secondary coil P2. In some cases, when the primary coil P1 and / or the secondary coil P2 are electrically connected to the outside, they need to pass through the first opening 130. As shown in FIG. 3 , the end of the primary coil P1 passes through the first opening 130, thereby being electrically connected to an external device.

[0057] Optionally, the width of the first opening 130 increases in the direction outward from the magnetic column group 200. The magnetic column group 200 is located inside the magnetic core group 100, and the direction outward from the magnetic column group 200 refers to the direction from the inside to the outside of the magnetic core group 100. In this way, the first opening 130 forms a cone, and the increase in the outer opening area is conducive to making room for the coil so that the end of the coil can pass through.

[0058] In one embodiment, the magnetic ring 300 is provided with a second opening. In order to avoid other components, such as coils, etc. during the assembly process, the magnetic ring 300 may be provided with a second opening (not shown in the figure) to avoid interference with other components during the assembly process. The second opening may extend along the magnetic ring 300, such as the second opening may penetrate the magnetic ring 300 in the height direction of the magnetic ring 300, or penetrate the magnetic ring 300 in the thickness direction of the magnetic ring 300. Alternatively, the second opening may be only partially opened in the height direction or thickness direction of the magnetic ring without penetrating. In addition, the number of the second openings may be one or more, which is determined according to the position and number of components that may interfere during the assembly of the magnetic ring 300.

[0059] In one embodiment, the magnetic permeability of the magnetic ring 300 is determined according to the leakage inductance between the primary coil P1 and the secondary coil P2. The magnetic ring 300 is arranged between the primary coil P1 and the secondary coil P2 to meet the leakage inductance requirement, while reducing the complexity of component assembly and improving the convenience of component assembly. The magnetic permeability of the magnetic ring 300 can be calculated according to the calculation formula of inductance to a preliminary range and further determined through simulation experiments.

[0060] Relative magnetic permeability refers to the magnetic permeability of a material relative to a vacuum or air, and represents the magnetic field enhancement effect of a material relative to a vacuum under a given magnetic field. Relative magnetic permeability is usually represented by the symbol μr, which is the ratio of the magnetic permeability of a material to the magnetic permeability of a vacuum μ0, that is, μr=μ / μ0. Relative magnetic permeability is a dimensionless physical quantity. In one embodiment, the relative magnetic permeability of the magnetic core group 100 is 700~4000, and the relative magnetic permeability of the magnetic ring 300 is 5~150. Within this permeability range, the magnetic field distribution of the formed resonant transformer can be uniform. It should be noted that the relative magnetic permeability of the magnetic core group 100 and the magnetic ring is not limited to the above range, but can also be a parameter outside the above numerical range.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A resonant transformer, characterized in that: The resonant transformer comprises: A magnetic core group, comprising a first magnetic core and a second magnetic core arranged opposite to each other, wherein the first magnetic core has a first accommodating cavity, the second magnetic core has a second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are opposite to each other to form an accommodating space; A magnetic column group is arranged in the accommodation space, and the accommodation space is constructed as an annular space; and A magnetic ring divides the annular space into a first subspace for accommodating the primary coil and a second subspace for accommodating the secondary coil, and the magnetic permeability of the magnetic ring is lower than the magnetic permeability of the magnetic core group.

2. The resonant transformer according to claim 1, characterized in that: The magnetic permeability of the magnetic ring is determined according to the leakage inductance between the primary coil and the secondary coil.

3. The resonant transformer according to claim 1, characterized in that: The magnetic ring includes a separable first magnetic ring and a second magnetic ring.

4. The resonant transformer according to claim 1, characterized in that: The first magnetic core is provided with a positioning groove for accommodating the magnetic ring in the first accommodating cavity, and the second magnetic core is provided with a positioning protrusion for supporting the magnetic ring in the second accommodating cavity, and the positioning groove and the positioning protrusion are located opposite to each other.

5. The resonant transformer according to claim 4, characterized in that: The depth of the positioning groove is equal to the height of the positioning protrusion.

6. The resonant transformer according to claim 1, characterized in that: The area between the magnetic ring and the magnetic column group is a first subspace, which is used to accommodate the primary coil; the area between the magnetic ring and the inner wall of the magnetic core group is a second subspace, which is used to accommodate the secondary coil.

7. The resonant transformer according to claim 1, characterized in that: The side surface of the magnetic core group has a first opening, and the first opening extends inward at least to the magnetic column group. The first opening is used to provide a space for the primary coil and the secondary coil.

8. The resonant transformer according to claim 7, characterized in that: The width of the first opening increases along an outward direction of the magnetic column group.

9. The resonant transformer according to claim 1, characterized in that: The magnetic ring is provided with a second opening.

10. The resonant transformer according to claim 1, characterized in that: The first magnetic core and the second magnetic core are both cylindrical, and the first accommodating cavity and the second accommodating cavity are both cylindrical.

11. The resonant transformer according to claim 1, characterized in that: The magnetic column group includes a first magnetic column and a second magnetic column that are arranged opposite to each other. The first magnetic column is arranged in the first accommodating cavity and connected to the first magnetic core. The second magnetic column is arranged in the second accommodating cavity and connected to the second magnetic core.

12. The resonant transformer according to claim 1, characterized in that: The relative magnetic permeability of the magnetic core group is 700-4000, and the relative magnetic permeability of the magnetic ring is 5-150.

Images