A planar transformer, leakage inductance adjustment method and medium

Abstract

The present invention proposes a planar transformer and a leakage inductance adjustment method thereof, comprising a magnetic core, wherein the magnetic core comprises a first magnetic core and a second magnetic core, wherein the first magnetic core is provided with a first left column and a first right column, and the second magnetic core is provided with a second left column and a second right column, so that a leakage inductance adjustment channel is formed inside the magnetic core; the primary coil is provided with a first through hole; the secondary PCB winding is provided with a second through hole; when the first magnetic core and the second magnetic core are E-type magnetic cores, the first magnetic core is provided with a first middle column, and the second magnetic core is provided with a second middle column, the leakage inductance adjustment channel is divided into a first air gap and a second air gap, and the primary coil is provided in the first air gap; when the first magnetic core and the second magnetic core are I-type magnetic cores, the primary coil moves along the leakage inductance adjustment channel. By adjusting the size of the middle column of the magnetic core, or controlling the moving distance of the primary coil in the leakage inductance adjustment channel, the leakage inductance of the planar transformer is adjusted, the inductance element is omitted, and the heat dissipation performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage ray generators, and in particular to a planar transformer, a leakage inductance adjustment method and a medium. Background Art

[0002] In the prior art, in a pulse frequency modulated LLC inverter circuit, an external inductor and an inverter transformer are required to limit the current change rate in the LLC inverter circuit, but the external inductor and inverter transformer will cause the overall volume of the transformer to be larger and the heat dissipation performance to be poor. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a planar transformer, a leakage inductance adjustment method and a medium, which can effectively reduce the volume of the transformer and improve the heat dissipation performance of the transformer.

[0004] In a first aspect, an embodiment of the present invention provides a planar transformer, including:

[0005] A magnetic core, the magnetic core comprising a first magnetic core and a second magnetic core, the first magnetic core being provided with a first left column and a first right column, the second magnetic core being provided with a second left column and a second right column, the first left column being connected to the second left column, and the first right column being connected to the second right column, so that a leakage inductance adjustment channel is formed inside the magnetic core;

[0006] A primary coil, wherein the primary coil is provided with a first through hole;

[0007] A secondary PCB winding, wherein the secondary PCB winding is provided with a second through hole;

[0008] When the first magnetic core and the second magnetic core are both E-type magnetic cores, the first left column and the second left column pass through the first through hole, the inner surface of the first through hole is connected to one side of the first left column and the second left column, the first magnetic core is provided with a first middle column, the second magnetic core is provided with a second middle column, the first middle column and the second middle column are provided in the middle part of the leakage inductance adjustment channel, the first middle column and the second middle column divide the leakage inductance adjustment channel into a first air gap and a second air gap, and the primary coil is provided in the first air gap;

[0009] When the first magnetic core and the second magnetic core are I-type magnetic cores, the first right column and the second right column pass through the second through hole, the lower surface of the secondary PCB winding is connected to the second magnetic core, and the primary coil is mounted on the first magnetic core through the first through hole so that the primary coil moves along the leakage inductance adjustment channel.

[0010] In some embodiments of the present invention, the inner surface of the first through hole is connected to one side of the first left column and the second left column by glue.

[0011] In some embodiments of the present invention, both the first magnetic core and the second magnetic core are I-type magnetic cores, and the thickness of the secondary PCB winding ranges from 5 mm to 5.5 mm.

[0012] In some embodiments of the present invention, the secondary PCB winding is a printed circuit board, and the number of layers of the printed circuit board is 16.

[0013] In some embodiments of the present invention, the primary coil is a coaxial core coil.

[0014] In a second aspect, an embodiment of the present invention provides a leakage inductance adjustment method for a planar transformer, which is used to adjust the leakage inductance of the planar transformer described in the first aspect. When the magnetic properties of the primary coil, the secondary PCB winding and the magnetic core remain unchanged, the method includes:

[0015] Determine the positions of the primary coil, the secondary PCB winding and the magnetic core, and place the primary coil in the leakage inductance adjustment channel of the magnetic core;

[0016] Obtaining a first leakage inductance threshold of the planar transformer, and adjusting the position of the primary coil according to the first leakage inductance threshold, or adjusting the length of the first middle column and the second middle column of the second magnetic core, wherein the first leakage inductance threshold is a preset leakage inductance threshold of the planar transformer;

[0017] Obtain the second leakage inductance threshold of the planar transformer after the adjustment is completed, adjust the primary coil according to the second leakage inductance threshold, or adjust the first center column and the second center column according to the second leakage inductance threshold until the second leakage inductance threshold is equal to the first leakage inductance threshold.

[0018] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the leakage inductance adjustment method of the planar transformer as described in the second aspect above.

[0019] The planar transformer according to the embodiment of the present invention has at least the following beneficial effects:

[0020] The magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core is provided with a first left column and a first right column, the second magnetic core is provided with a second left column and a second right column, the first left column is connected to the second left column, and the first right column is connected to the second right column, so that a leakage inductance adjustment channel is formed inside the magnetic core; a primary coil, the primary coil is provided with a first through hole; a secondary PCB winding, the secondary PCB winding is provided with a second through hole; when the first magnetic core and the second magnetic core are both E-type magnetic cores, the first left column and the second left column pass through the first through hole, and the inner surface of the first through hole is connected to the first left column and the first right column. One side of the two left columns is connected, the first magnetic core is provided with a first middle column, the second magnetic core is provided with a second middle column, the first middle column and the second middle column are arranged in the middle part of the leakage inductance adjustment channel, the first middle column and the second middle column divide the leakage inductance adjustment channel into a first air gap and a second air gap, and the primary coil is arranged in the first air gap; when the first magnetic core and the second magnetic core are I-type magnetic cores, the first right column and the second right column pass through the second through hole, the lower surface of the secondary PCB winding is connected to the second magnetic core, and the primary coil is sleeved on the first magnetic core through the first through hole, so that the primary coil moves along the leakage inductance adjustment channel. According to the planar transformer of this embodiment, the magnetic circuit of the planar transformer is increased by the magnetic core, the primary coil and the secondary PCB winding, without the need to additionally increase the inductance and the inverter transformer, and the volume of the planar transformer is effectively simplified, and the contact area between the planar transformer and the air is increased, which effectively ensures the heat dissipation of the planar transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of a planar transformer provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a leakage inductance adjustment channel provided by an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a magnetic core structure provided by an embodiment of the present invention;

[0024] Figure 4 is a flow chart of a leakage inductance adjustment method for a planar transformer provided by an embodiment of the present invention;

[0025] Figure 5 It is a circuit schematic diagram of a planar transformer provided in one embodiment of the present invention.

[0026] Reference numerals:

[0027] Primary coil 100; first through hole 110; magnetic core 200; first magnetic core 210; first left column 211; first right column 212; first middle column 213; second magnetic core 220; second left column 221; second right column 222; second middle column 223; leakage inductance adjustment channel 230; first air gap 240; second air gap 250; secondary PCB winding 300; second through hole 310. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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 device or element referred to 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.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] The control method of the embodiment of the present invention is further described below based on the accompanying drawings.

[0033] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5The embodiment of the present invention provides a planar transformer, including a magnetic core 200, the magnetic core 200 includes a first magnetic core 210 and a second magnetic core 220, the first magnetic core 210 is provided with a first left column 211 and a first right column 212, the second magnetic core 220 is provided with a second left column 221 and a second right column 222, the first left column 211 is connected to the second left column 221, and the first right column 212 is connected to the second right column 222, so that a leakage inductance adjustment channel 230 is formed inside the magnetic core 200; a primary coil 100, the primary coil 100 is provided with a first through hole 110; a secondary PCB winding 300, the secondary PCB winding 300 is provided with a second through hole 310; when the first magnetic core 210 and the second magnetic core 220 are both E-type magnetic cores, the first left column 211 and the second left column 221 penetrate the first through hole 110, and the interior of the first through hole 110 The surface is connected to one side of the first left column 211 and the second left column 221, the first magnetic core 210 is provided with a first middle column 213, and the second magnetic core 220 is provided with a second middle column 223. The first middle column 213 and the second middle column 223 are arranged in the middle part of the leakage inductance adjustment channel 230, and the first middle column 213 and the second middle column 223 divide the leakage inductance adjustment channel 230 into a first air gap 240 and a second air gap 250, and the primary coil 100 is arranged in the first air gap 240; when the first magnetic core 210 and the second magnetic core 220 are I-type magnetic cores, the first right column 212 and the second right column 222 pass through the second through hole 310, and the lower surface of the secondary PCB winding 300 is connected to the second magnetic core 220, and the primary coil 100 is sleeved on the first magnetic core 210 through the first through hole 110 so that the primary coil 100 moves along the leakage inductance adjustment channel 230.

[0034] It should be noted that, in the transformer of the prior art, the coil structure determines that the secondary line and the secondary coil are coaxial cores, and the leakage inductance of the magnetic flux is small, and an inductor needs to be added to the loop for parameter matching and debugging. Since the current passing through the transformer is large, the heat dissipation capacity of the inductor needs to be considered, so the volume is large. In this embodiment, after the leakage inductance of the secondary PCB coil is converted to the primary coil 100, the leakage inductance of the planar transformer is adjusted by adjusting the size of the column in the magnetic core 200, or controlling the moving distance of the primary coil 100 in the leakage inductance adjustment channel 230, thereby omitting the inductor element, and the heat dissipation performance of the planar transformer is also relatively superior.

[0035] It should be noted that the output voltage of the planar transformer implemented in this embodiment is 7500V, and the maximum interlayer withstand voltage of the secondary PCB coil is 4000V, 2*(7500 / 14)=1071V, and the interlayer withstand voltage meets the requirements; the routing interval of the secondary PCB coil is 0.3mm, and the copper thickness is 3OZ, which ensures the characteristics of the planar transformer. At the same time, because the interlayer dielectric thickness is 3OZ, the interlayer insulation and interturn insulation of the planar transformer are guaranteed, and the reactive power value of the primary coil 100 and the stability of the secondary PCB winding 300 of the transformer are also greatly improved.

[0036] It should be noted that the leakage inductance of the planar transformer is adjusted by polishing the first middle column 213 and the second middle column 223. When the first middle column 213 and the second middle column 223 are not polished, the leakage inductance of the planar transformer is the largest. When the first middle column 213 and the second middle column 223 are all polished, the leakage inductance of the planar transformer is the smallest. By setting the first middle column 213 and the second middle column 223 connected to each other, the leakage inductance adjustment channel 230 is divided into a first air gap 240 and a second air gap 250, the primary coil 100 is set in the first air gap 240, and the secondary PCB winding 300 is set in the second air gap 250, and the coupling of the magnetic field and energy transmission of the planar transformer are realized through the primary coil 100, the magnetic core 200 and the secondary PCB winding 300.

[0037] The inner surface of the first through hole 110 is connected to one side of the first left column 211 and the second left column 221 by glue. It should be noted that by connecting the first through hole 110, the first left column 211 and the second left column 221 by glue, the first through hole 110, the first left column 211 and the second left column 221 form a whole, thereby enhancing the structural rigidity and stability of the planar transformer, and reducing the problems of magnetic field leakage and vibration during the operation of the planar transformer. In addition, the glue can fill the gaps that may exist in the magnetic circuit, so that the magnetic core 200 can effectively absorb the magnetic field, reduce the leakage of the magnetic field, and improve the efficiency and noise ripple performance of the planar transformer.

[0038] The first magnetic core 210 and the second magnetic core 220 are both I-type magnetic cores, and the thickness of the secondary PCB winding ranges from 5 mm to 5.5 mm. It should be noted that the thickness of the secondary PCB winding ranges from 5 mm to 5.5 mm, which can provide a larger heat conduction path and heat dissipation surface area, further improving the heat dissipation performance of the planar transformer, and when the planar transformer is used at high power, it can effectively transfer heat to the surrounding environment, thereby ensuring that the planar transformer operates within a safe temperature range.

[0039] The secondary PCB winding 300 is a printed circuit board, and the number of layers of the printed circuit board is 16. It should be noted that by using a 16-layer PCB board as the output end of the planar transformer, multiple functions are integrated through a PCB board with a high number of layers, thereby reducing the overall size of the planar transformer. The 16-layer PCB board as the secondary winding of the planar transformer can better distribute and transfer heat, and by increasing the contact area between the PCB board and the air, the heat dissipation performance of the planar transformer is improved, ensuring that the operating temperature of the planar transformer is within a reasonable range.

[0040] The thickness of the printed circuit board ranges from 5 mm to 5.5 mm. It should be noted that the printed circuit board has 16 layers of wiring, and the line width of each layer is 0.3 mm.

[0041] The primary coil 100 is a coaxial core coil. It should be noted that the coaxial core coil realizes energy transmission and conversion through mutual inductive coupling, and the coaxial core coil can realize efficient power transmission. Through mutual inductive coupling, electric energy can be transmitted from the primary coil 100 to the secondary coil, realizing long-distance energy transmission, and the coaxial core coil has a compact design. Since the primary coil 100 and the secondary coil are located on the same axis, less space is occupied.

[0042] Reference Figure 4 , Figure 4 A flowchart of a leakage inductance adjustment method for a planar transformer provided in an embodiment of the present invention includes but is not limited to the following steps:

[0043] Step S11, determining the positions of the primary coil, the secondary PCB winding and the magnetic core, and placing the primary coil in the leakage inductance adjustment channel of the magnetic core;

[0044] Step S12, obtaining a first leakage inductance threshold of the planar transformer, adjusting the position of the primary coil according to the first leakage inductance threshold, or adjusting the length of the first middle column and the second middle column of the second magnetic core, wherein the first leakage inductance threshold is a preset leakage inductance threshold of the planar transformer;

[0045] It should be noted that the position of the primary coil in the leakage inductance adjustment channel is adjusted according to the first leakage inductance threshold value, and the leakage inductance is increased by moving the primary coil to the left, and the leakage inductance is reduced by moving the primary coil to the right;

[0046] Adjust the length of the middle column of the second magnetic core. The longer the middle column, the greater the leakage inductance, and the shorter the middle column, the smaller the leakage inductance. In this embodiment, the leakage inductance of the planar transformer is adjusted by adjusting the position of the primary coil or the length of the middle column. After the leakage inductance is adjusted, the position of the primary coil is fixed by glue.

[0047] Step S13, obtaining the second leakage inductance threshold of the adjusted planar transformer, adjusting the primary coil according to the second leakage inductance threshold, or adjusting the first middle column and the second middle column according to the second leakage inductance threshold, until the second leakage inductance threshold is equal to the first leakage inductance threshold.

[0048] It should be noted that the detection device obtains the second leakage inductance threshold of the planar transformer, and adjusts the primary coil or the center column so that the second leakage inductance threshold is equal to the first leakage inductance threshold.

[0049] It should be noted that the principle of this solution is: by setting a leakage inductance adjustment channel in the magnetic core, by adjusting the distance of the primary coil in the leakage inductance adjustment channel, or by polishing the middle column of the magnetic core, the leakage inductance value of the planar transformer can be adjusted, thereby eliminating the inductance adjustment component in the LLC circuit, and under the planar characteristics of the planar transformer, the contact area between the secondary PCB winding and the air is larger, which is convenient for heat dissipation.

[0050] It should be noted that by adjusting the distance of the primary coil in the leakage inductance adjustment channel, the mutual inductance coupling between the primary coil and the secondary PCB winding is optimized, and then the inductance and resonant frequency of the planar transformer are adjusted, thereby improving the energy transmission efficiency.

[0051] It should be noted that when the primary coil is placed in the first air gap and the secondary PCB winding is placed in the second air gap, the leakage inductance of the planar transformer is adjusted by polishing the middle column of the magnetic core until the second leakage inductance threshold is equal to the first leakage inductance threshold, thereby completing the leakage inductance adjustment of the planar transformer.

[0052] An embodiment of the present application further provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the leakage inductance adjustment method of the planar transformer is implemented.

[0053] As a non-transient computer-readable storage medium, the memory can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and are implemented to be located in one place, or may also be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0054] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media generally include computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery media.

[0055] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A method for adjusting leakage inductance of a planar transformer, characterized in that: Used to adjust the leakage inductance of the planar transformer, the planar transformer includes a magnetic core, the magnetic core includes a first magnetic core and a second magnetic core, the first magnetic core is provided with a first left column and a first right column, the second magnetic core is provided with a second left column and a second right column, the first left column is connected to the second left column, and the first right column is connected to the second right column, so that a leakage inductance adjustment channel is formed inside the magnetic core; a primary coil, the primary coil is provided with a first through hole, the primary coil is a coaxial core coil, and the primary coil and the secondary coil are located on the same axis; a secondary coil, the secondary coil is provided with a second through hole, the secondary coil is a printed circuit board, and the number of layers of the printed circuit board is 16 layers; when the first magnetic core and the second magnetic core are both E-type magnetic cores, the first left column and the second left column pass through the first through hole, The inner surface of the first through hole is connected to one side of the first left column and the second left column, the first magnetic core is provided with a first middle column, the second magnetic core is provided with a second middle column, the first middle column and the second middle column are arranged in the middle part of the leakage inductance adjustment channel, the first middle column and the second middle column divide the leakage inductance adjustment channel into a first air gap and a second air gap, and the primary coil is arranged in the first air gap; when the first magnetic core and the second magnetic core are I-type magnetic cores, the first right column and the second right column pass through the second through hole, the lower surface of the secondary coil is connected to the second magnetic core, the primary coil is sleeved on the first magnetic core through the first through hole, so that the primary coil moves along the leakage inductance adjustment channel, and the magnetic properties of the primary coil, the secondary coil and the magnetic core remain unchanged, the method includes: Determine the positions of the primary coil, the secondary coil and the magnetic core, and place the primary coil in the leakage inductance adjustment channel of the magnetic core; Obtaining a first leakage inductance threshold of the planar transformer, and adjusting the position of the primary coil according to the first leakage inductance threshold, or adjusting the length of the first middle column and the second middle column of the second magnetic core, wherein the first leakage inductance threshold is a preset leakage inductance threshold of the planar transformer; Obtain the second leakage inductance threshold of the planar transformer after the adjustment, adjust the primary coil according to the second leakage inductance threshold, or adjust the first center column and the second center column according to the second leakage inductance threshold until the second leakage inductance threshold is equal to the first leakage inductance threshold.

2. The leakage inductance adjustment method of a planar transformer according to claim 1, characterized in that: The inner surface of the first through hole is connected to one side of the first left column and the second left column by glue.

3. The leakage inductance adjustment method of a planar transformer according to claim 1, characterized in that: The first magnetic core and the second magnetic core are both I-type magnetic cores, and the thickness of the secondary coil ranges from 5 mm to 5.5 mm.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the leakage inductance adjustment method of a planar transformer as claimed in claim 1.

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