CN115565763A - Planar magnetic element - Google Patents

Planar magnetic element Download PDF

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Publication number
CN115565763A
CN115565763A CN202211364209.7A CN202211364209A CN115565763A CN 115565763 A CN115565763 A CN 115565763A CN 202211364209 A CN202211364209 A CN 202211364209A CN 115565763 A CN115565763 A CN 115565763A
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CN
China
Prior art keywords
core
magnetic core
planar
cylindrical
winding
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Pending
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CN202211364209.7A
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Chinese (zh)
Inventor
吴新科
杨金旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZJU Hangzhou Global Scientific and Technological Innovation Center
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ZJU Hangzhou Global Scientific and Technological Innovation Center
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Application filed by ZJU Hangzhou Global Scientific and Technological Innovation Center filed Critical ZJU Hangzhou Global Scientific and Technological Innovation Center
Priority to CN202211364209.7A priority Critical patent/CN115565763A/en
Publication of CN115565763A publication Critical patent/CN115565763A/en
Pending legal-status Critical Current

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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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/346—Preventing or reducing leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F2027/348—Preventing eddy currents

Abstract

The present invention provides a planar magnetic element, comprising: the magnetic core comprises a first planar magnetic core, a second planar magnetic core, a first cylindrical magnetic core, a second cylindrical magnetic core, a third cylindrical magnetic core and a winding; the plane structure formed by the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core is clamped between the plane where the first planar magnetic core is located and the plane formed by the second planar magnetic core; the first cylindrical magnetic core and the second cylindrical magnetic core are arranged in parallel, the third cylindrical magnetic core is positioned at the first ends of the first cylindrical magnetic core and the second cylindrical magnetic core, or the third cylindrical magnetic core is clamped between the first cylindrical magnetic core and the second cylindrical magnetic core; the winding is simultaneously used as a primary winding and a secondary winding and is wound on the outer sides of the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core together and sequentially surrounds the first cylindrical magnetic core, the third cylindrical magnetic core and the second cylindrical magnetic core. The invention solves the technical problems of low element integration level and large winding loss, improves the element integration level and reduces the eddy current loss.

Description

Planar magnetic element
Technical Field
The invention relates to the field of magnetic elements, in particular to a planar magnetic element.
Background
The planar magnetic element can reduce the overall height of the magnetic element, is easy for large-scale mechanical production, and is a key element in an electric energy conversion device. In the prior art, as shown in fig. 1, two magnetic elements, namely an inductor and a transformer, have their respective windings, and their magnetic cores are shared by integration, but the integration level is low and the magnetic elements have a large volume. Wherein, 1 is a primary winding of the transformer, 2 is a secondary winding of the transformer, 3 is an inductance winding, 4 is a magnetic core of the transformer, and 5 is an inductance magnetic core. The two magnetic elements of the inductor and the transformer reserve respective windings 1, 2 and 3, and part of magnetic cores of the two magnetic elements are integrated and shared, so that the planar magnetic element shown in fig. 1 has low integration degree and limited volume reduction. The planar magnetic element shown in fig. 2 improves the integration of the inductor and the transformer, the primary winding 1 and the secondary winding 2 of the transformer are respectively wound on different magnetic columns, and the magnetic core of the transformer is designed separately from the independent magnetic columns. However, the scheme has a large external leakage magnetic field, is easy to cause electromagnetic interference to surrounding devices, and has the defects of lack of interleaving of primary and secondary windings of the transformer and large winding loss.
Disclosure of Invention
In order to solve the technical problems of low integration level, high leakage magnetic field and large winding loss of a planar magnetic element in the prior art, the invention provides a planar magnetic element, which is characterized by comprising the following steps: the magnetic core comprises a first planar magnetic core, a second planar magnetic core, a first cylindrical magnetic core, a second cylindrical magnetic core, a third cylindrical magnetic core and a winding;
the plane structure formed by the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core is clamped between the plane where the first planar magnetic core is located and the plane formed by the second planar magnetic core;
the first cylindrical magnetic core and the second cylindrical magnetic core are arranged in parallel, and the third cylindrical magnetic core is positioned at the first ends of the first cylindrical magnetic core and the second cylindrical magnetic core or is clamped between the first cylindrical magnetic core and the second cylindrical magnetic core;
the winding is used as a primary winding and a secondary winding and is wound around the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core in sequence.
Preferably, the winding is wound around the outer sides of the first cylindrical magnetic core and the second cylindrical magnetic core, and the primary winding and the secondary winding have opposite currents; the winding is wound around the outer side of the third cylindrical magnetic core, and the primary winding and the secondary winding have the same current direction.
Preferably, the windings wound around the first cylindrical magnetic core and the second cylindrical magnetic core are equivalent to a transformer winding; the winding wound on the third cylindrical magnetic core is equivalent to a resonance inductance winding; the first part of the winding wound on the first cylindrical magnetic core, the second part of the winding wound on the second cylindrical magnetic core and the third part of the winding wound on the third cylindrical magnetic core share a common part.
Preferably, the transformer excitation flux and the inductance flux of the planar magnetic element are integrated and shared in the first planar magnetic core, the second planar magnetic core, the first column magnetic core and the second column magnetic core; the third cylindrical magnetic core is an independent inductive magnetic flux cylindrical magnetic core.
Preferably, the planar magnetic element further comprises an air gap for adjusting inductance.
Preferably, the air gap is a first annular groove arranged around the first planar magnetic core and the second planar magnetic core;
and/or the presence of a gas in the atmosphere,
the air gap is at least one second annular groove arranged on one surface of the first planar magnetic core and one surface of the second planar magnetic core.
Preferably, the horizontal positions of the first annular grooves arranged around the first planar magnetic core and the second planar magnetic core are located between the third cylindrical magnetic core and the first cylindrical magnetic core and between the second cylindrical magnetic core and the third cylindrical magnetic core; the projection of the first annular groove in the vertical direction is overlapped with a third part of the winding wound on the third cylindrical magnetic core.
Preferably, the air gap is formed by at least one second annular groove arranged on one surface of the first planar magnetic core and one surface of the second planar magnetic core, and the second annular groove is a segmented groove; the second annular groove is for reducing losses of the winding proximate the second annular groove.
Preferably, the planar magnetic component further comprises a third planar core, a fourth planar core; the first and second planar magnetic cores are sandwiched between planes formed by the third and fourth planar magnetic cores; the third and fourth planar magnetic cores are used as extra conducting paths of the transformer excitation magnetic flux.
Preferably, the third planar magnetic core, and/or the fourth planar magnetic core further comprises a slot for weakening the magnetic effect of the third planar magnetic core, and/or the fourth planar magnetic core on the inductive magnetic flux.
The planar magnetic element provided by the invention has high integration degree, avoids the defect of winding lack of a staggered structure caused by the split winding of the primary side and the secondary side, effectively inhibits the magnetic field leakage, and has the advantages that firstly, the winding integration degree is high, the equivalent inductance winding is integrated on a single inductance magnetic column, and the utilization rate of the inductance magnetic column PCB is improved; meanwhile, the primary winding and the secondary winding of the transformer are used for constructing equivalent inductance, so that the length of the winding is further reduced. And secondly, the integration level of the magnetic part is high, the transformer and the inductor share a magnetic core, and the magnetic flux of the transformer and the magnetic flux of the inductor are superposed in the magnetic core except the inductive magnetic column, so that the magnetic circuit can be integrated and reused, and the volume of the magnetic part is further reduced. In addition, the air gap structure provided by the invention is matched with the magnetic core structure, so that the magnetic force lines vertically passing through the winding are adjusted to be parallel to the magnetic force lines of the winding, the vertical component passing through the winding is reduced, and the eddy current loss caused by a magnetic field is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a diagram of a planar magnetic element according to a first prior art;
fig. 2 is a structural view of a planar magnetic element according to a second prior art;
figure 3 is an exploded view of a 3D planar magnetic element according to one embodiment of the present invention;
fig. 4 is a schematic diagram of a planar magnetic element according to an embodiment of the present invention;
fig. 5 is an exploded view of a planar magnetic element 3D structure according to a second embodiment of the present invention;
fig. 6 is a schematic view of a planar magnetic element according to a second embodiment of the present invention;
fig. 7 is an exploded view of a 3D planar magnetic element according to a third embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example one
The present embodiment provides a planar magnetic component, as shown in fig. 3-4, comprising a first planar core 31, a second planar core 32, a first cylindrical core 33, a second cylindrical core 34, a third cylindrical core 35, and a winding 36.
The planar structure of the first pillar-shaped magnetic core 33, the second pillar-shaped magnetic core 34, and the third pillar-shaped magnetic core 35 is sandwiched between the plane of the first planar magnetic core 31 and the plane of the second planar magnetic core 32.
The first cylindrical magnetic core 33 and the second cylindrical magnetic core 34 are arranged in parallel, and the third cylindrical magnetic core 35 is located at the first end of the first cylindrical magnetic core 33 and the first end of the second cylindrical magnetic core 34.
The winding 36 is used as a primary winding and a secondary winding, and is wound around the first cylindrical magnetic core 33, the second cylindrical magnetic core 34, and the outer side 35 of the third cylindrical magnetic core, and sequentially surrounds the first cylindrical magnetic core 33, the third cylindrical magnetic core 34, and the second cylindrical magnetic core 35.
The winding 36 is a flat winding, preferably a PCB winding or a flat copper conductor. The winding 36 surrounds the outer sides of the first cylindrical magnetic core 33 and the second cylindrical magnetic core 34, and the primary winding and the secondary winding are in opposite current directions; the winding is wound around the outer side of the third cylindrical magnetic core 35, and the primary winding and the secondary winding have the same current direction. The windings wound around the first cylindrical core 33 and the second cylindrical core 34 are equivalent to transformer windings. The winding wound around the third cylindrical magnetic core 35 is equivalent to a resonant inductor winding, and may be composed of a single primary winding or a single secondary winding, or may be composed of both the primary winding and the secondary winding. The first portion of the winding wound around the first cylindrical magnetic core 33, the second portion of the winding wound around the second cylindrical magnetic core 34, and the third portion of the winding wound around the third cylindrical magnetic core 35 have a common portion, which contributes to shortening the overall winding length.
The transformer excitation magnetic flux and the inductance magnetic flux of the planar magnetic element are integrated and shared in the first planar magnetic core 31, the second planar magnetic core 32, the first column-shaped magnetic core 33 and the second column-shaped magnetic core 34; the third cylindrical core 35 is an independent inductive flux cylindrical core. The loop of the transformer excitation magnetic flux is as follows: first planar magnetic core 31-second planar magnetic core 32-first column magnetic core 33-second column magnetic core 34. The loop of the inductance magnetic flux is divided into two sections, wherein the first section is as follows: the third cylindrical magnetic core 35-the first planar magnetic core 31-the first cylindrical magnetic core 33-the second planar magnetic core 32; the second section is as follows: third cylindrical core 35-first planar core 31-second cylindrical core 34-second planar core 32.
In order to adjust the inductance, the air gap may be disposed on the first planar core, the second planar core, or the first column core, the second column core, or the third column core. Fig. 4 is a schematic diagram of disposing the air gaps 511 and 521 on the first planar magnetic core 51 and the second planar magnetic core 52, wherein the air gaps 511 and 521 are at least one annular groove surrounding the first planar magnetic core 51 and the second planar magnetic core 52. The air gaps 511, 521 are preferably segmented air gaps.
The air gaps 511 and 521 are located between the third cylindrical magnetic core 55 and the first cylindrical magnetic core and the second cylindrical magnetic core; the projections of the air gaps 511 and 521 in the vertical direction overlap with the third portion of the winding wound around the third cylindrical magnetic core 55.
The air gaps 511 and 521 are used as air gaps of the inductive magnetic circuit, so that the phenomenon that the diffused magnetic flux at the air gap position on the magnetic column in the vertical direction has larger magnetic field component in the vertical direction to penetrate through the winding to cause larger eddy current loss in the traditional design is avoided. Based on the structural characteristics of the air gaps 511 and 521, the magnetic lines of force in the space region between the air gaps 511 and 521 are effectively adjusted, so that the magnetic lines of force with a larger proportion in the diffused magnetic flux are parallel to the winding, and the formation of vertical magnetic field components is avoided. Therefore, the air gaps 511 and 521 are used as air gaps of the inductive magnetic circuit, which effectively regulate and control the magnetic flux of the third cylindrical magnetic core 55, and the structures of the air gaps 511 and 521 improve the magnetic field of the space where the winding part sandwiched between the first planar magnetic core 51 and the second planar magnetic core 52 is located, thereby reducing the winding loss.
The planar magnetic element provided by the embodiment has high integration degree, avoids the phenomenon that the primary side and the secondary side are divided into the slot windings to cause the lack of a staggered structure of the windings, and effectively inhibits the leakage of a magnetic field. Firstly, the winding integration level is high, and the equivalent inductance winding is integrated on a single inductance magnetic column, so that the utilization rate of the inductance magnetic column PCB is improved; meanwhile, the primary winding and the secondary winding of the transformer are used for constructing equivalent inductance, so that the length of the winding is further reduced. And secondly, the integration level of the magnetic part is high, the transformer and the inductor share a magnetic core, and the magnetic flux of the transformer and the magnetic flux of the inductor are superposed in the magnetic core except the inductive magnetic column, so that the magnetic circuit can be integrated and reused, and the volume of the magnetic part is further reduced. In addition, the air gap structure provided by the embodiment is matched with the magnet structure, so that the magnetic force lines vertically penetrating through the winding are adjusted to be parallel to the magnetic force lines of the winding, the vertical component penetrating through the winding is reduced, and the eddy current loss caused by the magnetic field is reduced.
Example two
The present embodiment provides a planar magnetic component, as shown in fig. 5-6, including a first planar core 41, a second planar core 42, a first cylindrical core 43, a second cylindrical core 44, a third cylindrical core 45, and a winding 46.
The plane structure formed by the first cylindrical magnetic core 43, the second cylindrical magnetic core 44 and the third cylindrical magnetic core 45 is sandwiched between the plane of the first planar magnetic core 41 and the plane formed by the second planar magnetic core 42.
The third cylindrical core 45 is sandwiched between the first cylindrical core 43 and the second cylindrical core 44.
The winding 46 is used as a primary winding and a secondary winding, and is wound around the first cylindrical magnetic core 43, the second cylindrical magnetic core 44, and the outer side 45 of the third cylindrical magnetic core, and sequentially passes through the first cylindrical magnetic core 43, the third cylindrical magnetic core 44, and the second cylindrical magnetic core 45.
The winding 46 is a flat winding, preferably a PCB winding or a flat copper conductor. The winding 46 surrounds the outer sides of the first cylindrical magnetic core 43 and the second cylindrical magnetic core 44, and the primary winding and the secondary winding are in opposite current directions; the winding is wound around the outer side of the third cylindrical magnetic core 45, and the primary winding and the secondary winding have the same current direction. The windings wound around the first cylindrical core 43 and the second cylindrical core 44 are equivalent to transformer windings. The winding wound around the third cylindrical magnetic core 45 is equivalent to a resonant inductor winding, and may be composed of a single primary winding or a single secondary winding, or may be composed of both the primary winding and the secondary winding. The first portion of the winding wound around the first cylindrical core 43, the second portion of the winding wound around the second cylindrical core 44, and the third portion of the winding wound around the third cylindrical core 45 share a common portion, which contributes to shortening the overall winding length.
The transformer excitation magnetic flux and the inductance magnetic flux of the planar magnetic element are integrated and shared in the first planar magnetic core 41, the second planar magnetic core 42, the first column-shaped magnetic core 43 and the second column-shaped magnetic core 44; the third cylindrical magnetic core 45 is an independent inductive flux cylindrical magnetic core. The loop of the transformer excitation magnetic flux is as follows: first planar magnetic core 41-second planar magnetic core 42-first cylindrical magnetic core 43-second cylindrical magnetic core 44. The loop of the inductance magnetic flux is divided into two sections, wherein the first section is as follows: third cylindrical magnetic core 45-first planar magnetic core 41-first cylindrical magnetic core 43-second planar magnetic core 42; the second section is as follows: third cylindrical core 45-first planar core 41-second cylindrical core 44-second planar core 42.
The planar magnetic element of the present embodiment may also be provided with an air gap, and the position and function of the air gap are the same as those of the embodiment. Further, fig. 6 shows an embodiment in which an air gap is provided on the first planar magnetic core 61. At least one annular segmented air gap 611 is arranged on the first planar magnetic core 61, and is used as an air gap of an inductive magnetic circuit, and has a regulating effect on the third cylindrical magnetic core. In addition, the segmented air gap 611 improves the magnetic field in the space where the winding near the segmented air gap 611 is located, and the winding loss can be effectively reduced.
In this embodiment, the third cylindrical core 45 for independently providing inductive magnetic flux is moved from the first ends of the first cylindrical core 43 and the second cylindrical core 44 to the middle between the first cylindrical core 43 and the second cylindrical core 44, so as to further reduce the winding length and further reduce the winding loss. In addition, the improvement makes the structure of the planar magnetic element provided by the embodiment more compact, and further reduces the volume of the magnet.
EXAMPLE III
The present embodiment provides a planar magnetic component, as shown in fig. 7, including a first planar core, a second planar core, a first cylindrical core, a second cylindrical core, a third cylindrical core, a winding, a third planar core 77, and a fourth planar core 78. The third and fourth planar cores 77 and 78 serve as an additional conducting magnetic path for the excitation flux.
The plane structure formed by the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core is clamped between the plane where the first planar magnetic core is located and the plane formed by the second planar magnetic core.
The first cylindrical magnetic core and the second cylindrical magnetic core are arranged in parallel, and the third cylindrical magnetic core is located at the first end of the first cylindrical magnetic core and the first end of the second cylindrical magnetic core.
The winding is simultaneously used as a primary winding and a secondary winding and is wound on the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core together in sequence.
The winding is a flat winding, preferably a PCB winding or a flat copper conductor. The winding is wound around the outer sides of the first cylindrical magnetic core and the second cylindrical magnetic core, and the primary winding and the secondary winding are in opposite current directions; the winding is wound around the outer side of the third cylindrical magnetic core, and the primary winding and the secondary winding have the same current direction. And the winding wound on the first cylindrical magnetic core and the second cylindrical magnetic core is equivalent to a transformer winding. The winding wound on the third cylindrical magnetic core is equivalent to a resonant inductance winding, and can be composed of a single primary winding or a single secondary winding, or can be composed of the primary winding and the secondary winding at the same time. The first part of the winding wound on the first cylindrical magnetic core, the second part of the winding wound on the second cylindrical magnetic core and the third part of the winding wound on the third cylindrical magnetic core share a common part, which is beneficial to shortening the length of the whole winding.
The transformer excitation magnetic flux and the inductance magnetic flux of the planar magnetic element are integrated and shared in the first planar magnetic core, the second planar magnetic core, the first column-shaped magnetic core and the second column-shaped magnetic core; the third cylindrical magnetic core is an independent inductive magnetic flux cylindrical magnetic core. The loop of the transformer excitation magnetic flux is as follows: first planar magnetic core-second planar magnetic core-first column magnetic core-second column magnetic core. The loop of the inductance magnetic flux is divided into two sections, wherein the first section is as follows: a third cylindrical core-first planar core-first cylindrical core-second planar core; the second section is as follows: third cylindrical magnetic core-first planar magnetic core-second cylindrical magnetic core-second planar magnetic core.
In order to adjust the inductance, the air gap may be disposed on the first planar core, the second planar core, or the first column core, the second column core, or the third column core.
At least one annular segmented gap 711 is provided in the first planar core for acting as an air gap for the magnetic circuit of the inductor, which has a regulating effect on the third cylindrical core. In addition, the segmented air gap 711 improves the magnetic field in the space where the windings are located near the segmented air gap 611, and the winding loss can be effectively reduced.
A notch 781 for weakening the magnetic path influence of the fourth planar magnetic core 78 on the inductance magnetic flux is provided on the fourth planar magnetic core 78.
The planar magnetic element provided by the embodiment is highly integrated, the equivalent inductance winding is integrated on a single inductance magnetic column, the utilization rate of the inductance magnetic column PCB is improved, meanwhile, the equivalent inductance is constructed by trying the primary winding and the secondary winding of the transformer, and the resistance length is further reduced; the transformer winding and the inductance winding provided by the embodiment share the magnetic core, and the excitation magnetic flux and the inductance magnetic flux of the transformer are superposed in the magnetic core except the inductance magnetic column, so that the magnetic circuit is integrated and reused, the integration level of a magnetic part is improved, and the volume of the magnetic part is further reduced; the matching structure of the air gap and the winding can further reduce the size of a space magnetic field of the winding, adjust the magnetic force line vertically penetrating through the winding to be parallel to the magnetic force line of the winding, and reduce the vertical component penetrating through the winding, so that the winding loss is greatly reduced.
The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without the specific details. Thus, the foregoing descriptions of specific embodiments described herein are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to those skilled in the art that many modifications and variations are possible in light of the above teaching. Further, as used herein to refer to the position of a component, the terms above and below, or their synonyms, do not necessarily refer to an absolute position relative to an external reference, but rather to a relative position of the component with reference to the drawings.
Moreover, the foregoing drawings and description include many concepts and features that may be combined in various ways to achieve various benefits and advantages. Thus, features, components, elements and/or concepts from various different figures may be combined to produce embodiments or implementations not necessarily shown or described in this specification. Furthermore, not all features, components, elements and/or concepts shown in a particular figure or description are necessarily required to be in any particular embodiment and/or implementation. It is to be understood that such embodiments and/or implementations fall within the scope of the present description.

Claims (10)

1. A planar magnetic component, comprising: the magnetic core comprises a first planar magnetic core, a second planar magnetic core, a first cylindrical magnetic core, a second cylindrical magnetic core, a third cylindrical magnetic core and a winding;
the plane structure formed by the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core is clamped between the plane where the first planar magnetic core is located and the plane formed by the second planar magnetic core;
the first cylindrical magnetic core and the second cylindrical magnetic core are arranged in parallel, and the third cylindrical magnetic core is positioned at the first ends of the first cylindrical magnetic core and the second cylindrical magnetic core or is clamped between the first cylindrical magnetic core and the second cylindrical magnetic core;
the winding is simultaneously used as a primary winding and a secondary winding and is wound on the first cylindrical magnetic core, the second cylindrical magnetic core and the third cylindrical magnetic core together in sequence.
2. The planar magnetic component of claim 1, wherein the winding surrounds portions of the first and second cylindrical cores that are outside of the first and second cylindrical cores, and wherein the primary winding is current-commutated in a direction opposite the secondary winding; the winding is wound around the outer side of the third cylindrical magnetic core, and the primary winding and the secondary winding have the same current direction.
3. The planar magnetic component of claim 1, wherein the windings wound around the first and second cylindrical cores are equivalent to transformer windings; the winding wound on the third cylindrical magnetic core is equivalent to a resonance inductance winding; the first part of the winding wound on the first cylindrical magnetic core, the second part of the winding wound on the second cylindrical magnetic core and the third part of the winding wound on the third cylindrical magnetic core have a shared part.
4. The planar magnetic component of claim 1, wherein transformer excitation flux and inductor flux of the planar magnetic component are integrated and shared in a first planar core, a second planar core, a first pillar core, and a second pillar core; the third cylindrical magnetic core is an independent inductive magnetic flux cylindrical magnetic core.
5. The planar magnetic component of claims 1-4, further comprising an air gap for adjusting inductance.
6. The planar magnetic component of claim 5, wherein the air gap is a first annular groove disposed circumferentially around the first planar core and the second planar core;
and/or the presence of a gas in the gas,
the air gap is at least one second annular groove arranged on one surface of the first planar magnetic core and one surface of the second planar magnetic core.
7. The planar magnetic component of claim 6, wherein the horizontal position of the first annular groove disposed around the first planar core and the second planar core is between the third cylindrical core and the first cylindrical core and the second cylindrical core; the projection of the first annular groove in the vertical direction is overlapped with a third part of the winding wound on the third cylindrical magnetic core.
8. The planar magnetic component of claim 6, wherein the air gap is segmented as at least one second annular groove disposed on a face of the first planar core and the second planar core; the second annular groove is used for reducing the loss of the winding close to the second annular groove.
9. The planar magnetic component of claim 1, further comprising a third planar core, a fourth planar core; the first and second planar magnetic cores are sandwiched between planes formed by the third and fourth planar magnetic cores; the third and fourth planar magnetic cores are used as extra conducting paths of the transformer excitation magnetic flux.
10. The planar magnetic component of claim 9, wherein the third planar core, and/or the fourth planar core, further comprises a slot therein for attenuating the effect of the third planar core, and/or the fourth planar core on the magnetic path of the inductive flux.
CN202211364209.7A 2022-11-02 2022-11-02 Planar magnetic element Pending CN115565763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211364209.7A CN115565763A (en) 2022-11-02 2022-11-02 Planar magnetic element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211364209.7A CN115565763A (en) 2022-11-02 2022-11-02 Planar magnetic element

Publications (1)

Publication Number Publication Date
CN115565763A true CN115565763A (en) 2023-01-03

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CN202211364209.7A Pending CN115565763A (en) 2022-11-02 2022-11-02 Planar magnetic element

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