LLC transformer

Abstract

The invention provides an LLC transformer which comprises a magnetic core body, a main transformer winding and a resonance winding, the magnetic core body is composed of two magnetic cores, the two magnetic cores are buckled to form a closed magnetic circuit, and the main transformer winding and the resonance winding are wound on the two magnetic cores. The main transformer winding and the resonance winding are integrated on the same magnetic core, so that the size of the LLC transformer is reduced, and meanwhile, the loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic devices, and in particular to an LLC transformer. Background Art

[0002] The LLC transformer is the core component of the LLC resonant converter, which usually contains two inductors (primary resonant inductor and secondary resonant inductor) and a transformer body (including primary main transformer winding and secondary main transformer winding). These components resonate at the switching frequency to achieve efficient power conversion.

[0003] In the LLC topology transformer structure with a separate design, the resonant inductor and the main transformer are two completely independent components, and there are many components, so they occupy a large additional space. However, the space available for installing the transformer is getting smaller and smaller. Therefore, how to reduce the size of the transformer is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In view of this, the present application provides an LLC transformer to reduce the size of the device and reduce losses at the same time.

[0005] The present application provides an LLC transformer, comprising a magnetic core body, a main transformer winding and a resonant winding, wherein the magnetic core body is composed of two magnetic cores, the two magnetic cores are buckled to form a closed magnetic circuit, and the main transformer winding and the resonant winding are wound on the two magnetic cores.

[0006] In some embodiments, the two magnetic cores each include a first magnetic side column, a magnetic center column, a second magnetic side column, an isolation column and a magnetic plate, the first magnetic side column, the magnetic center column, the second magnetic side column and the isolation column of each magnetic core are all connected to the magnetic plate, and the first magnetic side column, the magnetic center column, the second magnetic side column and the isolation column of the two magnetic cores are connected one by one, the first magnetic side column and the second magnetic side column are located on opposite sides of the magnetic center column, the isolation column is arranged between the first magnetic side column and the magnetic center column and between the magnetic center column and the second magnetic side column, the main transformer winding is wound on the magnetic center column, and the resonant winding is wound on the first magnetic side column and the second magnetic side column.

[0007] In some embodiments, the resonant winding includes a primary resonant winding and a secondary resonant winding, the primary resonant winding is wound on the first magnetic side pole, and the secondary resonant winding is wound on the second magnetic side pole.

[0008] In some embodiments, the main transformer winding includes a primary main transformer winding and a secondary main transformer winding, the primary main transformer winding and the secondary main transformer winding are wound on the magnetic center column, the primary main transformer winding is connected in series with the primary resonant winding, and the secondary resonant winding is connected in series with the secondary resonant winding.

[0009] In some embodiments, the primary main transformer winding and the primary resonant winding are integrally wound using a single conductor, so that the primary main transformer winding and the primary resonant winding are connected in series.

[0010] In some embodiments, the secondary main transformer winding and the secondary resonant winding are integrally wound using a single conductor, so that the secondary main transformer winding and the secondary resonant winding are connected in series.

[0011] In some embodiments, an air gap is provided at the connection between the two magnetic cores.

[0012] In some embodiments, the two magnetic cores are fixedly connected by glue dispensing so that the two magnetic cores form a closed magnetic circuit.

[0013] In some embodiments, the LLC transformer further includes a base having an upwardly protruding convex plate on the base, the convex plate is arranged to form a fixing groove, and the fixing groove is used to be fixedly connected to one of the two magnetic cores.

[0014] In some embodiments, a fixing hole for fixing a terminal is provided on the outer side of the fixing groove, and the terminal is electrically connected to the main transformer winding and the resonant winding.

[0015] The present application provides an LLC transformer, including a magnetic core body, a main transformer winding and a resonant winding, wherein the magnetic core body is composed of two magnetic cores, the two magnetic cores are buckled to form a closed magnetic circuit, and the main transformer winding and the resonant winding are wound on the two magnetic cores. By integrating the main transformer winding and the resonant winding on the same set of magnetic cores, the volume of the LLC transformer is reduced, the miniaturization design of the device is realized, and the loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the LLC transformer provided by the present application;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the magnetic core body provided by the present application;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of a magnetic core provided by the present application;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the base provided in this application.

[0021] Reference numerals:

[0022] 10. LLC transformer; 100. magnetic core body; 110. magnetic core; 111. first magnetic side column; 112. magnetic middle column; 113. second magnetic side column; 114. isolation column; 115. magnetic plate; 200. main transformer winding; 300. primary resonant winding; 400. secondary resonant winding; 500. base; 510. convex plate; 520. fixing groove; 530. fixing hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0024] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a person skilled in the art to which this application belongs. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The terms "connection", "electrical connection", and "electrical connection" used herein include any direct and indirect electrical or structural connection means. Therefore, if the text describes a first device coupled / connected / electrically connected to a second device, it means that the first device can be directly electrically / structurally connected to the second device, or indirectly electrically / structurally connected to the second device through other devices or connection means.

[0026] The present application provides an LLC transformer, comprising a magnetic core body, a main transformer winding and a resonant winding. The magnetic core body is composed of two magnetic cores, the two magnetic cores are buckled to form a closed magnetic circuit, and the main transformer winding and the resonant winding are wound on the two magnetic cores.

[0027] In the prior art, the space for installing the transformer is limited, and the transformer with a separate design means that the resonant inductor and the main transformer are two completely independent components with a large volume, and therefore, additional space is required; in the present application, by integrating the main transformer winding and the resonant winding on the same pair of magnetic cores, there is no need to use additional space to place the resonant inductor, thereby reducing the volume, and there is no need to make a separate resonant inductor, thereby reducing costs. At the same time, it can reduce the loss in the energy transmission process and improve the overall efficiency of the device.

[0028] See also Figure 1-Figure 4 , Figure 1 It is a three-dimensional structural schematic diagram of the LLC transformer provided by the present application; Figure 2 It is a schematic diagram of the three-dimensional structure of the magnetic core body provided by the present application; Figure 3 It is a schematic diagram of the three-dimensional structure of a magnetic core provided by the present application; Figure 4 The present application provides an LLC transformer, wherein the LLC transformer 10 comprises a magnetic core 110 body 100, a main transformer winding 200 and a resonant winding, wherein the magnetic core 110 body 100 is composed of two magnetic cores 110, the two magnetic cores 110 are buckled to form a closed magnetic circuit, and the main transformer winding 200 and the resonant winding are wound on the two magnetic cores 110. Specifically, the LLC transformer 10 includes a magnetic core 110 main body 100, a main transformer winding 200 and a resonant winding; the magnetic core 110 main body 100 is composed of two magnetic cores 110, and the two magnetic cores 110 are buckled to form a closed magnetic circuit. The material forming the magnetic core 110 includes at least one of manganese-zinc ferrite, iron-silicon-aluminum, iron-silicon alloy, iron-nickel-molybdenum magnetic powder core and nickel-zinc ferrite, which is not limited here; the main transformer winding 200 and the resonant winding are wound on the two magnetic cores 110, and the main transformer winding 200 and the resonant winding are both formed by winding wires, and the wires can be Mylar wires or insulated wires, which are not limited here.

[0029] In the prior art, the space for installing the transformer is limited, and the transformer with a separate design means that the resonant inductor and the main transformer are two completely independent components with a large volume, so additional space is required; in the present application, by integrating the main transformer winding 200 and the resonant winding on the same pair of magnetic cores 110, there is no need to use additional space to place the resonant inductor, which reduces the volume, and there is no need to make a separate resonant inductor, which reduces the amount of raw materials and assembly costs, thereby reducing costs, and at the same time, can reduce the loss in the energy transmission process, and improve the overall efficiency of the device; the material of the magnetic core 110 of the present application is not limited, so that the magnetic core 1 10 The most suitable material for the magnetic core 110 can be selected according to different application scenarios and requirements, so that the product structure can be widely used in various product platforms to meet different market requirements; the transformer device of the present application is provided with a resonant inductor magnetic core 110 and a resonant winding, so that the structure of the present application is relatively leakage inductance integrated design, and has an actual resonant winding and a resonant inductor magnetic core 110 as a support, so that the inductance value can be adjusted by the actual resonant winding and the resonant inductor magnetic core 110, so that the tolerance is smaller, and because the structure is more stable, the inductance value is not easy to decay with time and environmental changes, that is, the inductance value is easy to adjust, the tolerance is small, and it is not easy to decay.

[0030] In one embodiment, the two magnetic cores 110 each include a first magnetic side column 111, a magnetic center column 112, a second magnetic side column 113, an isolation column 114 and a magnetic plate 115. The first magnetic side column 111, the magnetic center column 112, the second magnetic side column 113 and the isolation column 114 of each magnetic core 110 are connected to the magnetic plate 115, and the first magnetic side columns 111, the magnetic center column 112, the second magnetic side columns 113 and the isolation column 114 of the two magnetic cores 110 are connected one by one. The first magnetic side column 111 and the second magnetic side column 113 are located on opposite sides of the magnetic center column 112. Isolation columns 114 are provided between the first magnetic side column 111 and the magnetic center column 112 and between the magnetic center column 112 and the second magnetic side column 113. The main transformer winding 200 is wound on the magnetic center column 112, and the resonant winding is wound on the first magnetic side column 111 and the second magnetic side column 113. Specifically, the two magnetic cores 110 each include a first magnetic side column 111, a magnetic center column 112, a second magnetic side column 113, an isolation column 114, and a magnetic plate 115. One end of the first magnetic side column 111, the magnetic center column 112, the second magnetic side column 113, and the isolation column 114 of each magnetic core 110 are connected to the magnetic plate 115, and the first magnetic side columns 111, the magnetic center column 112, the second magnetic side columns 113, and the isolation columns 114 of the two magnetic cores 110 are connected one by one. The first magnetic side columns 111, the magnetic center column 112, the second magnetic side columns 113, and the isolation columns 114 are spaced apart. The magnetic plates 115 of the two magnetic cores 110 are arranged opposite to each other, the first magnetic side column 111 and the second magnetic side column 113 are located on the opposite sides of the magnetic center column 112, and isolation columns 114 are arranged between the first magnetic side column 111 and the magnetic center column 112 and between the magnetic center column 112 and the second magnetic side column 113. The main transformer winding 200 is wound on the magnetic center column 112, and the resonant winding is wound on the first magnetic side column 111 and the second magnetic side column 113, that is, the magnetic center column 112 is the magnetic core 110 of the main transformer, and the first magnetic side column 111 and the second magnetic side column 113 are the magnetic core 110 of the resonant inductor. An isolation column 114 is provided between the main transformer winding 200 and the resonant winding to reduce electromagnetic interference between the main transformer winding 200 and the resonant winding, and to disperse and conduct the heat generated in the winding, thereby reducing the operating temperature of the device and improving the reliability and life of the device; the provision of the isolation column 114 can effectively confine the magnetic field to the inside of the corresponding magnetic column, thereby reducing magnetic field leakage and energy loss, thereby enabling the circuit to transmit electrical energy more efficiently, thereby improving the overall efficiency of the system.

[0031] In one embodiment, the resonant winding includes a primary resonant winding 300 and a secondary resonant winding 400, the primary resonant winding 300 is wound on the first magnetic side column 111, and the secondary resonant winding 400 is wound on the second magnetic side column 113. Specifically, the resonant winding includes a primary resonant winding 300 and a secondary resonant winding 400, the primary resonant winding 300 is wound on the first magnetic side column 111 of the two magnetic cores 110, and the primary resonant winding 300 is wound on the second magnetic side column 113 of the two magnetic cores 110. In the present application, by winding the resonant winding of the resonant inductor on the magnetic side columns on both sides of the main transformer winding 200, the winding space is increased, the winding process is made easier and more flexible, and it is helpful to realize the flat design of the device, and further reduce the size of the device in the height direction.

[0032] In one embodiment, the main transformer winding 200 includes a primary main transformer winding and a secondary main transformer winding, and the primary main transformer winding and the secondary main transformer winding are wound on the magnetic center column 112, that is, the primary main transformer winding and the secondary main transformer winding are wound on the same magnetic column, the primary main transformer winding is connected in series with the primary resonant winding 300, and the secondary resonant winding 400 is connected in series with the secondary resonant winding 400. In the present application, the primary main transformer winding and the secondary main transformer winding are wound on the same magnetic column so that the magnetic flux can be shared more effectively, thereby reducing magnetic leakage, thereby improving the energy conversion efficiency of the transformer, and enhancing the electromagnetic coupling between them. At the same time, the amount of required core material can be reduced, and the layout and connection of the windings can be simplified, that is, the structure of the transformer can be simplified and the manufacturing cost can be reduced; the secondary main transformer winding is set to be connected in series with the secondary resonant winding 400 and the secondary main transformer winding is set to be connected in series with the secondary resonant winding 400, so as to improve the power conversion efficiency, energy transmission and conversion, optimize circuit performance, and enhance circuit stability and safety.

[0033] In one embodiment, the primary main transformer winding and the primary resonant winding 300 are wound in one piece with one conductor, so that the primary main transformer winding and the primary resonant winding 300 are connected in series, that is, the primary main transformer winding and the primary resonant winding 300 are wound with one conductor. By winding the primary main transformer winding and the primary resonant winding 300 with one conductor, the number of winding components that need to be manufactured separately is reduced, thereby simplifying the assembly structure of the transformer; by winding the primary main transformer winding and the primary resonant winding 300 with one conductor, the two windings can be directly connected through the conductor itself without the need for additional welding or connectors, that is, the connection process is simplified and the number of welding points is reduced, thereby reducing the welding cost, and reducing the number of welding points can reduce the failure rate caused by poor welding and improve the reliability of the device; using one conductor to wind two windings makes the winding process more suitable for automated production, thereby efficiently completing the winding work and improving production efficiency.

[0034] In one embodiment, the secondary main transformer winding and the secondary resonant winding 400 are wound in one piece with one conductor, so that the secondary main transformer winding and the secondary resonant winding 400 are connected in series, that is, the secondary main transformer winding and the secondary resonant winding 400 are formed by winding with one conductor. By winding the secondary main transformer winding and the secondary resonant winding 400 with one conductor, the number of winding components that need to be manufactured separately is reduced, thereby simplifying the assembly structure of the transformer; by winding the secondary main transformer winding and the secondary resonant winding 400 with one conductor, the two windings can be directly connected through the conductor itself without the need for additional welding or connectors, that is, the connection process is simplified and the number of welding points is reduced, thereby reducing the welding cost, and reducing the number of welding points can reduce the failure rate caused by poor welding and improve the reliability of the device; using one conductor to wind two windings makes the winding process more suitable for automated production, thereby efficiently completing the winding work and improving production efficiency.

[0035] In one embodiment, an air gap is provided at the connection between the two magnetic cores 110. Specifically, when the first magnetic side column 111, the magnetic center column 112, the second magnetic side column 113 and the isolation column 114 of one magnetic core 110 are connected one-to-one with the first magnetic side column 111, the magnetic center column 112, the second magnetic side column 113 and the isolation column 114 of another magnetic core 110, an air gap is provided between the two first magnetic side columns 111, between the two magnetic center columns 112, between the two second magnetic side columns 113 and between the two isolation columns 114. The air gap can be air or an air gap sheet formed by a non-magnetic material. An air gap is provided at the connection between the two magnetic cores 110 so that the inductance of the magnetic circuit can be adjusted through the air gap to ensure the frequency response and stability of the circuit. Furthermore, the air gap is an air gap sheet formed by a non-magnetic material, and the air gap sheet is connected to the two magnetic cores 110 by a colloid.

[0036] In one embodiment, the two magnetic cores 110 are fixedly connected by dispensing glue, that is, the two magnetic cores 110 are fixedly connected by colloid, so that the two magnetic cores 110 form a closed magnetic circuit to improve mechanical stability, and at the same time prevent the two magnetic cores 110 from moving due to vibration or temperature changes, thereby maintaining the stability and reliability of the magnetic circuit, reducing magnetic leakage, and improving the efficiency and performance of the magnetic circuit.

[0037] In one embodiment, the LLC transformer 10 further includes a base 500, on which a convex plate 510 protrudes upward is provided, and the convex plate 510 is surrounded to form a fixing groove 520, and the fixing groove 520 is used to be fixedly connected to one of the two magnetic cores 110. The arrangement of the base 500 can fix the relative positions of the components of the device, and facilitates installation on the PCB board.

[0038] In one embodiment, a fixing hole 530 for fixing a terminal is provided on the outside of the fixing groove 520, and the terminal is electrically connected to the main transformer winding 200 and the resonant winding. By providing the fixing hole 530 for fixing the terminal on the base 500, the wire ends of the winding are prevented from loosening or falling off due to vibration during the operation of the motor, thereby avoiding electrical or mechanical failures caused thereby, and thus ensuring the reliability of the device.

[0039] In one embodiment, the LLC transformer 10 further includes a frame, which is mounted on the first magnetic side column 111, the second magnetic side column 113 and the magnetic center column 112 to fix the position of the winding to prevent deformation or displacement during operation of the device, thereby ensuring the reliability and service life of the device.

[0040] In one embodiment, the diameter of the magnetic center column 112 is larger than the diameters of the first magnetic side column 111 and the second magnetic side column 113, so that the magnetic center column 112 can provide a larger magnetic flux area, thereby allowing a larger current to pass through, so as to meet the needs of high power transmission, and reduce the magnetic flux density, reduce the saturation risk of the magnetic core 110, and ensure that the transformer can operate stably within a wide input voltage range. At the same time, a larger heat dissipation area is provided, which helps to dissipate heat and reduce temperature rise, thereby improving the reliability and service life of the transformer. The smaller diameters of the first magnetic side column 111 and the second magnetic side column 113 can make the self-inductance coefficient (inductance) of the resonant inductor easier to control, and help optimize the frequency response and stability of the resonant circuit. At the same time, the self-inductance coefficient (inductance) of the resonant inductor can be easier to control, and help optimize the frequency response and stability of the resonant circuit.

[0041] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An LLC transformer, characterized in that: It comprises a magnetic core body, a main transformer winding and a resonant winding. The magnetic core body is composed of two magnetic cores. The two magnetic cores are buckled to form a closed magnetic circuit. The main transformer winding and the resonant winding are wound on the two magnetic cores.

2. The LLC transformer according to claim 1, characterized in that: The two magnetic cores each include a first magnetic side column, a magnetic center column, a second magnetic side column, an isolation column and a magnetic plate. The first magnetic side column, the magnetic center column, the second magnetic side column and the isolation column of each magnetic core are all connected to the magnetic plate, and the first magnetic side column, the magnetic center column, the second magnetic side column and the isolation column of the two magnetic cores are connected one by one. The first magnetic side column and the second magnetic side column are located on opposite sides of the magnetic center column. The isolation column is provided between the first magnetic side column and the magnetic center column and between the magnetic center column and the second magnetic side column. The main transformer winding is wound on the magnetic center column, and the resonant winding is wound on the first magnetic side column and the second magnetic side column.

3. The LLC transformer according to claim 2, characterized in that: The resonant winding includes a primary resonant winding and a secondary resonant winding. The primary resonant winding is wound on the first magnetic side pole, and the secondary resonant winding is wound on the second magnetic side pole.

4. The LLC transformer according to claim 3, characterized in that: The main transformer winding comprises a primary main transformer winding and a secondary main transformer winding, the primary main transformer winding and the secondary main transformer winding are wound on the magnetic center column, the primary main transformer winding is connected in series with the primary resonant winding, and the secondary resonant winding is connected in series with the secondary resonant winding.

5. The LLC transformer according to claim 4, characterized in that: The primary main transformer winding and the primary resonant winding are integrally wound using a single conductor, so that the primary main transformer winding and the primary resonant winding are connected in series.

6. The LLC transformer according to claim 4, characterized in that: The secondary main transformer winding and the secondary resonant winding are integrally wound with one conductor, so that the secondary main transformer winding and the secondary resonant winding are connected in series.

7. The LLC transformer according to claim 1, characterized in that: An air gap is arranged at the connection between the two magnetic cores.

8. The LLC transformer according to claim 1, characterized in that: The two magnetic cores are fixedly connected by glue dispensing so that the two magnetic cores form a closed magnetic circuit.

9. The LLC transformer according to claim 1, characterized in that: The LLC transformer further comprises a base having an upwardly protruding convex plate on the base, wherein the convex plate is arranged to form a fixing groove, and the fixing groove is used for fixedly connecting with one of the two magnetic cores.

10. The LLC transformer according to claim 9, characterized in that: A fixing hole for fixing a terminal is arranged on the outer side of the fixing groove, and the terminal is electrically connected to the main transformer winding and the resonant winding.

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