WO2019201302A1 - Transformateur planaire, dispositif électronique et procédé de fabrication de transformateur planaire - Google Patents

Transformateur planaire, dispositif électronique et procédé de fabrication de transformateur planaire Download PDF

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Publication number
WO2019201302A1
WO2019201302A1 PCT/CN2019/083242 CN2019083242W WO2019201302A1 WO 2019201302 A1 WO2019201302 A1 WO 2019201302A1 CN 2019083242 W CN2019083242 W CN 2019083242W WO 2019201302 A1 WO2019201302 A1 WO 2019201302A1
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WO
WIPO (PCT)
Prior art keywords
coil
pcb
flat coil
winding
flat
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Application number
PCT/CN2019/083242
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English (en)
Chinese (zh)
Inventor
闵运胜
赵斌
徐旭
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优尔特电子（深圳）有限公司
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Publication of WO2019201302A1 publication Critical patent/WO2019201302A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2871—Pancake coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit

Definitions

  • the present application relates to the field of planar transformer technology, and in particular to a planar transformer, an electronic device, and a method for fabricating a planar transformer.
  • the transformer uses the principle of electromagnetic induction to achieve voltage conversion.
  • the transformer includes a primary coil, a secondary coil and a magnetic core.
  • the user can adjust the number of turns of the primary coil or the secondary coil to form a transformer according to product requirements.
  • FIG. 1 is a schematic diagram showing the principle of a planar transformer provided by a conventional technology. As shown in FIG. 1, the user constructs a planar transformer by alternately arranging a plurality of primary coils and secondary coils.
  • the conventional technology has at least the following problems: due to the large number of layers of the primary/secondary coil, the proximity effect is relatively large, and the parasitic capacitance of the planar transformer is also increased, thereby causing the power of the planar transformer. Low density and low efficiency.
  • An object of the embodiments of the present application is to provide a method for manufacturing a planar transformer, an electronic device and a planar transformer, which has a relatively high power density and high efficiency.
  • the embodiment of the present application provides the following technical solutions:
  • an embodiment of the present application provides a planar transformer including a first magnetic core, at least one PCB winding, at least one flat coil, and a second magnetic core, wherein the first magnetic core and the at least one PCB winding are Each of the PCB windings, each of the flat coils of the at least one flat coil, and the second core are concentrically assembled into the planar transformer.
  • each of the at least one PCB winding is alternately assembled with each of the at least one flat coil.
  • all of the PCB windings in the at least one PCB winding are connected in series/parallel.
  • all of the flat coils in the at least one flat coil are connected in series/parallel.
  • the flat coil comprises an alpha flat coil.
  • the alpha flat coil has 2 layers, and the alpha flat coil of each layer has a number of turns greater than or equal to 2 turns.
  • the PCB winding is a primary winding, and the flat coil is a secondary winding; or the PCB winding is a secondary winding, and the flat coil is a primary winding.
  • the PCB winding comprises an M-layer PCB coil
  • each layer of the PCB coil of the M-layer PCB coil can be used as a primary coil or a secondary coil, and in the PCB winding, the primary coil and the secondary coil are alternately assembled, M Is a positive integer and M ⁇ 1.
  • an embodiment of the present application provides an electronic device, including the planar transformer of any one of the above.
  • an embodiment of the present application provides a method for fabricating a planar transformer, including:
  • each of the first magnetic core, the at least one PCB winding, each of the at least one flat coil, and the second magnetic core are the same according to the series-parallel relationship and the assembly position relationship
  • the shaft core is assembled into the planar transformer.
  • the series-parallel relationship includes: each of the at least one PCB winding is connected in series/parallel with each other, and each of the at least one flat coil is connected in series/parallel with each other;
  • the assembly positional relationship includes alternately assembling each of the at least one PCB winding and each of the at least one flat coil;
  • each of the first magnetic core, the at least one PCB winding, each of the at least one flat coil, and the second magnetic coil according to the series-parallel relationship and the assembly position relationship
  • the core concentric is assembled into the planar transformer, including:
  • the first magnetic core, the at least one PCB winding, the at least one flat coil, and the second magnetic core are concentrically assembled into the planar transformer.
  • the PCB winding is a primary winding, and the flat coil is a secondary winding; or the PCB winding is a secondary winding, and the flat coil is a primary winding.
  • the providing at least one flat coil comprises:
  • N l is the number of turns per layer
  • s is the distance between the conductor layers
  • F l is the copper layer coefficient
  • h is the thickness of the flat coil
  • ⁇ is the penetration depth
  • the flat coil comprises an alpha flat coil.
  • the number of layers of the alpha flat coil is two, and the number of turns of each layer of the alpha flat coil is greater than or equal to 2 ⁇ .
  • the PCB winding comprises an M-layer PCB coil
  • each layer of the PCB coil of the M-layer PCB coil can be used as a primary coil or a secondary coil, and in the PCB winding, the primary coil and the secondary coil are alternately assembled.
  • M is a positive integer
  • the planar transformer includes a first magnetic core, at least one PCB winding, at least one flat coil, and a second magnetic core, the first magnetic core, each of the at least one PCB winding, and at least one flat coil
  • the flat coils and the second core are concentrically assembled into a planar transformer.
  • PCB windings and flat coils as primary/secondary coils, they have a stronger overcurrent capability than conventional wound coils.
  • the flat coil of the present application can laterally increase/decrease the number of turns, it can relatively avoid the need to assemble a multilayer primary/secondary coil. , thereby reducing proximity effects and parasitic capacitance, as well as increasing power density and reducing temperature rise.
  • FIG. 1 is a schematic diagram showing the principle of a conventional transformer
  • FIG. 2 is an exploded perspective view of a planar transformer according to an embodiment of the present application.
  • Figure 3 is a schematic structural view of the first magnetic core of Figure 2;
  • Figure 4 is a schematic structural view of the PCB winding of Figure 2;
  • Figure 5 is a schematic structural view of the flat coil of Figure 2;
  • FIG. 6 is a schematic structural diagram of a planar transformer according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a planar transformer according to another embodiment of the present application.
  • FIG. 8 is a schematic flow chart of a method for fabricating a planar transformer according to an embodiment of the present application.
  • Figure 9 is a schematic flow chart of step 83 in Figure 8.
  • FIG. 10 is a schematic flow chart of step 81 in FIG. 8.
  • the skin effect refers to the phenomenon that current concentrates on the outer thin layer of the conductor when there is alternating current or alternating electromagnetic field in the conductor.
  • the proximity effect refers to a special physical phenomenon in which a current concentrates on the adjacent side of the conductor when the high-frequency current flows in opposite directions to each other or flows in a reciprocating conductor. Both the skin effect and the proximity effect reduce the performance of the high frequency transformer. In high-frequency transformers, relatively, in a planar transformer using a flat-structure coil, the multi-layer proximity effect is more severe than the skin effect.
  • the skin effect only limits the conductive area to a portion of the surface and increases the copper loss. It does not change the current amplitude, but only changes the current density at the wound surface.
  • the eddy current caused by the variable magnetic field generated by the current of adjacent coil layers in the proximity effect increases exponentially with the increase of the number of coil layers.
  • the proximity effect has a great influence on the performance of the transformer.
  • planar transformer can be applied to various types of electronic devices, for example, the electronic device is a power device or a motor driven device, and the like.
  • the planar transformer 200 includes a first magnetic core 21, a PCB winding 22, a flat coil 23, and a second magnetic core 24.
  • the number of PCB windings 22 may be one or more than two.
  • the number of the flat coils 23 may be one or two or more.
  • the planar transformer 200 includes three PCB windings 22 and three flat coils 23. The user can select a corresponding number of PCB windings and flat coils according to product requirements.
  • the first core 21 or the second core 24 may be a magnetic metal oxide composed of a mixture of iron oxides.
  • the above magnetic core can be made of a manganese-zinc ferrite and a nickel-zinc ferrite material.
  • the above magnetic core may be of any suitable shape, for example, an "E" type magnetic core or the like.
  • the PCB winding 22 can be fabricated by providing a metal template and a non-metallic insulating medium for pre-patterning, placing the metal template in a special mold, and laying non-metallic insulating medium on the upper and lower sides of the metal template, respectively, and melting the non-metal.
  • the insulating medium is such that the non-metallic insulating medium coats the metal template and forms a product substrate. According to product requirements, a corresponding number of product substrates are stacked, and a corresponding number of product substrates after lamination are cut to form PCB windings.
  • the stacking manner between the product substrates includes: processing the fixing holes at the corresponding positions of the laminated product substrates and metallizing the fixing holes to form metallized holes, and the aperture, shape and quantity of the metallized holes are determined according to the operating current of the circuit board. .
  • the related product substrates are laminated through the process positioning holes, and further processing, the user can form the final PCB winding according to the design requirements.
  • the metal template having the pre-pattern includes a plurality of copper foil regions, and the width of the copper foil line located in the copper foil region may be different due to the difference in discrete components to which the copper foil regions are connected.
  • the metal template includes a copper foil template, an aluminum foil template, and other material templates, and the like, wherein the copper foil template may be a copper template.
  • the user can select the metal template of the corresponding thickness according to the product requirements to make the circuit board. For example, taking a metal template as a copper foil template as an example, a user can select a copper foil template having a thickness of 30 oz to 200 oz or more, and a copper foil template of this thickness range can pass a large current.
  • the user can select and lay down and melt the N-layer metal template and the N+1 non-metal insulating medium according to product requirements. For example, when the user needs 3 layers of metal templates, the user can select 4 layers of non-metal insulating medium respectively. Any one of the three metal templates is laid, wherein adjacent surfaces of adjacent metal templates share the same non-metallic insulating medium.
  • the metallized soldering holes are connected between the individual PCB windings through metal conductors to form the primary or secondary of the transformer.
  • the PCB winding has a safety specific pressure rating and a turn-to-turn voltage rating. At the same time, the PCB winding effectively overcomes the thermal effect brought by the skin effect and the edge effect. By optimizing the thickness of the copper layer and the size of the interlayer gap, the coil has an optimal AC-DC impedance ratio, thereby greatly improving the window utilization.
  • the flat coil 23 is formed by a flat film covered wire of a specific pressure rating, and is wound by a narrow-side radial and wide-side axial winding process. Since the flat coil 23 has a rectangular (square) copper wire in cross section, it is distinguished from a conventional coil winding having a circular cross section. Since the copper wire of the flat coil 23 is flattened, the transverse window is used in the same window area of the planar transformer. In the longitudinal direction of the two windings, the flat coil 23 can provide a sufficiently large window filling factor. Therefore, the planar transformer provided by the embodiment has a relatively large window filling factor and a large window utilization ratio. Since the window filling factor is relatively large, the current density of the flat coil 23 is relatively large, so that the planar transformer can pass a large current, the power volume ratio is high, and the temperature rise of the planar transformer is relatively low.
  • the first core 21, the PCB winding 22, the flat coil 23, and the second core 24 are concentrically assembled into a planar transformer 200.
  • the first core 21, the PCB winding 22, the flat coil 23, and the second core 24 are coaxially assembled into the planar transformer 200 in this order.
  • the first magnetic core 21, each of the two or more PCB windings, and the flat coils 23 of the two or more flat coils The second core 24 is coaxially assembled into a planar transformer 200.
  • the user can select an assembly position relationship between each of the PCB windings 22 and the two flat coils 23 of the two or more flat coils according to the product requirements, for example, the following assembly position relationship:
  • each of the PCB windings 22 is alternately assembled with each of the flat coils 23. Since the surface insulation of the PCB winding is relatively good, and the PCB winding 22 and the flat coil 23 are alternately assembled, the planar transformer formed by the assembly position relationship has the smallest proximity effect and better performance.
  • the flat coil adopted in the embodiment can increase the number of layers of the flat coil, the number of turns of each flat coil is increased, and the layers of the primary and secondary coils are alternately arranged, so that the plane is While the window area of the transformer is greatly utilized, the negative effects of the skin effect and the proximity effect are overcome, the parasitic capacitance is reduced, and the leakage inductance is reduced, and the overall power density and efficiency of the planar transformer are finally improved.
  • the user can determine the PCB winding 22 and the flat coil 23 as the primary winding or the secondary winding according to the product requirements.
  • all the PCB windings 22 are primary windings, and all the flat coils 23 are secondary windings; all PCBs
  • the winding 22 is a secondary winding, and all of the flat coils 23 are primary windings; a part of the PCB windings 22 are primary/secondary windings, and the other part of the PCB windings 22 are secondary/primary windings.
  • a part of the flat coils 23 are primary/secondary.
  • the winding, another portion of the flat coil 23, is a secondary/primary winding.
  • the user can also serially/parallel part/all of the PCB windings 22 and some/all of the flat coils 23 according to product requirements, for example: series/parallel connection of all PCB windings 22 in at least one PCB winding, series/parallel All of the flat coils 22 in at least one flat coil; or, in series/parallel, at least one of the PCB windings 22 in series/parallel, and another portion of the PCB windings 22 in parallel/series, at least one of the flat coils of the at least one flat coil is connected in series/parallel, and the other part
  • the flat coils 23 are connected in parallel/series; or, part of the PCB windings 22 of at least one PCB winding are connected in series/parallel with the partial flat coils 23 of the at least one flat coil, and the other part of the PCB windings 22 are connected in parallel/series with the other partial flat coils 23.
  • the first core 21 and the second core 24 have the same shape.
  • the first magnetic core 21 includes a base 210, a first side wall 211, a second side wall 212, and a magnetic core post 213.
  • the first side wall 211 is disposed on one side of the base 210, and the second side
  • the wall 212 is disposed on the other side of the base 210, and the first sidewall 211 is opposite to the second sidewall 212.
  • the magnetic core column 213 is disposed at a central portion of the base 210, and the magnetic core column 213 is a cylindrical body.
  • Each of the PCB windings 22 of the planar transformer 200 is alternately assembled with the flat coils 23.
  • the PCB winding 22 is provided with a shaft hole 221 , a plurality of insertion holes 222 , and a plurality of metal holes 223 .
  • the magnetic core post 213 can penetrate through the axial hole 221, and the diameter of the axial hole 221 is adapted to the diameter of the magnetic core post 213.
  • the insertion hole 222 is for connection with the flat coil 23, and the metal hole 223 is for connection with an external circuit or device.
  • the flat coil 23 as described above may be a single-layer flat coil or a flat coil of two or more layers.
  • the flat coil 23 is an alpha flat coil.
  • the alpha flat coil has two layers, and the number of turns of each layer of the alpha flat coil is greater than or equal to 2, for example, the number of turns of each layer of the alpha flat coil is 3.
  • the flat coil 23 includes a coil input end 231 and a coil output end 232.
  • the coil input end 231 and the coil output end 232 are both inserted into the corresponding plug holes 222. Therefore, when assembling the PCB winding 22 and the flat coil 23, the user only needs to insert the coil input end 231 of the flat coil 23 and the coil output end 232 into the corresponding insertion holes 222 of the PCB winding 22, so that the assembly can be completed quickly.
  • a first recess 2111 is disposed on a side of the first sidewall 211 facing the magnetic core post 213
  • a second recess is disposed on a side of the second sidewall 212 facing the magnetic pole post 213 . 2122.
  • the PCB winding 22 includes a first protrusion 224 and a second protrusion 225.
  • the first protrusion 224 is engaged in the first groove 2111, and the second protrusion 225 is engaged in the second groove 2122.
  • the PCB winding 22 and the first core 21 or the second core 24 can be quickly positioned and assembled more stably.
  • the planar transformer 200 includes three PCB windings 22 and three flat coils 23, the PCB winding 22 serves as a secondary coil, and the flat coil 23 serves as a primary coil.
  • the flat coils 23 has two layers of six turns, of which three turns per layer. Therefore, by selecting the flat coil, a great proximity effect is produced with respect to the conventional 18-layer winding. Obviously, the planar transformer provided by this embodiment can greatly reduce the proximity effect.
  • the embodiment of the present application overcomes the thermal effect brought by the skin effect and the proximity effect.
  • the flat coil has an optimal AC-DC impedance ratio, thereby greatly improving window utilization. .
  • the thickness of the optimal flat coil it can improve the loss of the current cross-sectional area caused by the skin effect and the edge effect, thereby maximizing the current density of the coil and greatly increasing the power-to-volume ratio of the planar transformer.
  • the PCB winding 22 includes an M-layer PCB coil, and each layer of the PCB coil of the M-layer PCB coil can be used as a primary coil or a secondary coil, and in the PCB winding, the primary coil and the secondary coil are alternately assembled, M is A positive integer and M ⁇ 1.
  • the PCB winding 22 includes 9 layers of PCB coils, wherein the front 3 layers of PCB coils are used as the secondary PCB coils 22a, the middle 3 layers of PCB coils are used as the primary PCB coils 22b, and the rear 3 layers of PCB coils are used as the secondary PCB coil 22c.
  • the user can make PCB windings according to the product requirements and define the number of primary or secondary coils in each PCB winding.
  • a planar transformer manufacturing method 800 includes:
  • Step 81 providing a first magnetic core, at least one PCB winding, at least one flat coil, and a second magnetic core;
  • Step 82 Determine, according to the number of turns between the primary coil and the secondary coil of the planar transformer, a series-parallel relationship and an assembly position relationship of each of the at least one PCB winding and/or each of the at least one flat coil;
  • Step 83 According to the relationship between the series-parallel relationship and the assembly position, each of the first magnetic core, the at least one PCB winding, the at least one flat coil, and the second magnetic core are concentrically assembled into a planar transformer.
  • the user can select an assembly position relationship between each PCB winding of two or more PCB windings and each of the two flat coils according to product requirements, for example, it can be the following assembly position relationship:
  • the user can determine the PCB winding and the flat coil as the primary winding or the secondary winding according to the product requirements, for example, all the PCB windings are primary windings, and all flat coils are secondary windings; all PCB windings are secondary Winding, all flat coils are primary windings; some PCB windings are primary/secondary windings, and the other part of the PCB windings are secondary/primary windings. Similarly, some flat coils are primary/secondary windings, and the other part of the flat coil is secondary. / primary winding.
  • the user can also serial/parallel part/all of the PCB windings and some/all of the flat coils according to product requirements, for example: series/parallel connection of all PCB windings in at least one PCB winding, at least one flat in series/parallel connection All of the flat coils in the coil; or, in parallel or in parallel, part of the PCB windings in at least one PCB winding, another part of the PCB windings in parallel/series, at least one of the flat coils in series/parallel in the flat coils, and the other part of the flat coils in parallel/series; or A portion of the PCB windings in the at least one PCB winding are connected in series/parallel with the partial flat coils in the at least one flat coil, and another portion of the PCB windings are connected in parallel/series to the other portion of the flat coils.
  • the series-parallel relationship includes each of the at least one PCB windings being connected in series/parallel with each other, and each of the at least one flat coils being connected in series/parallel with each other;
  • the assembly positional relationship includes Each of the at least one PCB winding is alternately assembled with each of the at least one flat coil.
  • step 83 includes:
  • Step 831 alternately assembling each of the at least one PCB winding and each of the at least one flat coil
  • Step 832 serially/parallel all the PCB windings in at least one PCB winding, and serially/parallel all the flat coils in at least one flat coil;
  • Step 833 Assemble the first magnetic core, the at least one PCB winding, the at least one flat coil, and the second magnetic core into the planar transformer.
  • the planar transformer formed by the assembly position relationship has the smallest proximity effect and better performance.
  • step 81 includes:
  • Step 811 determining an AC/DC impedance ratio according to a temperature rise requirement and a current density
  • Step 812 according to the Dowell curve, look up the table to obtain the Q value
  • Step 814 selecting a flat coil of an optimal thickness as a flat coil during assembly.
  • N l is the number of turns per layer
  • s is the distance between the conductor layers
  • F l is the copper layer coefficient
  • h is the thickness of the flat coil
  • ⁇ is the penetration depth.
  • the embodiment of the present application overcomes the thermal effect brought by the skin effect and the proximity effect.
  • the flat coil has an optimal AC-DC impedance ratio, thereby greatly improving window utilization. .
  • the thickness of the optimal flat coil it can improve the loss of the current cross-sectional area caused by the skin effect and the edge effect, thereby maximizing the current density of the coil and greatly increasing the power-to-volume ratio of the planar transformer.
  • the number of layers of the alpha flat coil is two, and the number of turns of the alpha flat coil per layer is three.
  • the PCB winding includes an M-layer PCB coil, and each layer of the PCB coil of the M-layer PCB coil can be used as a primary coil or a secondary coil, and in the PCB winding, the primary coil and the secondary coil are alternately assembled, and M is positive Integer, and M ⁇ 1.
  • planar transformer manufacturing method can be referred to the related description of the planar transformer provided by the embodiment of the present application.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un transformateur planaire, un dispositif électronique et un procédé de fabrication du transformateur planaire, se rapportant au domaine technique des transformateurs planaires. Le transformateur planaire comprend un premier noyau magnétique, au moins un enroulement de PCB, au moins une bobine plate et un second noyau magnétique, le premier noyau magnétique, chaque enroulement de PCB de l'au moins un enroulement de PCB, chaque bobine plate de l'au moins une bobine plate et le second noyau magnétique étant assemblés de manière coaxiale dans le transformateur planaire. Le nombre de tours de la bobine plate peut être augmenté/diminué de manière latérale, de façon à éviter d'avoir à assembler de multiples couches de bobine primaire/secondaire, ce qui permet de réduire l'effet de proximité et la capacité parasite, d'augmenter la densité de puissance et de réduire l'augmentation de température.
PCT/CN2019/083242 2018-04-19 2019-04-18 Transformateur planaire, dispositif électronique et procédé de fabrication de transformateur planaire WO2019201302A1 (fr)

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CN201810355336.8A CN108335879B (zh) 2018-04-19 2018-04-19 一种平面变压器、电子设备及平面变压器制作方法
CN201810355336.8 2018-04-19

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CN208444728U (zh) * 2018-08-13 2019-01-29 深圳Tcl新技术有限公司 平板变压器
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CN112700956A (zh) * 2020-12-21 2021-04-23 深圳顺络电子股份有限公司 一种平面绕线变压器及其制作方法
CN113765258B (zh) * 2021-08-18 2023-10-13 上海大学 一种复合多向无铁芯盘式电机
CN114121442A (zh) * 2021-11-05 2022-03-01 西安交通大学 一种用于电力电子变换器的低交流铜损平面磁件绕组
CN115662754A (zh) * 2022-12-06 2023-01-31 眉山博雅新材料股份有限公司 一种高频电源及应用于高频电源的变压器
CN117079944A (zh) * 2023-08-28 2023-11-17 山东航天电子技术研究所 一种基于扁铜线嵌套结构的绕组和高频电子变压器

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CN104882260A (zh) * 2015-05-18 2015-09-02 成都锐思灵科技有限公司 平面变压器
CN108335879A (zh) * 2018-04-19 2018-07-27 优尔特电子（深圳）有限公司 一种平面变压器、电子设备及平面变压器制作方法

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