EP4345853A1 - Inductor - Google Patents

Inductor Download PDF

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Publication number
EP4345853A1
EP4345853A1 EP22836679.5A EP22836679A EP4345853A1 EP 4345853 A1 EP4345853 A1 EP 4345853A1 EP 22836679 A EP22836679 A EP 22836679A EP 4345853 A1 EP4345853 A1 EP 4345853A1
Authority
EP
European Patent Office
Prior art keywords
winding
bottom plate
inductor
columns
coils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22836679.5A
Other languages
German (de)
English (en)
French (fr)
Inventor
Peng Yang
Hong Wang
Wei Zhou
Jingxuan ZHOU
Runchao LI
Yingchun Cui
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.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of EP4345853A1 publication Critical patent/EP4345853A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01F27/28—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
    • H01F27/006—Details of transformers or inductances, in general with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air
    • 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
    • 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
    • H01F27/2876—Cooling
    • 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
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • Embodiments of the present application relate to the technical field of inductors, in particular to an inductor.
  • inductors especially a high-power converter adopts an interleaving technology, which may effectively reduce a current ripple and achieve a higher power density and efficiency, so the number of magnetic parts required will be inevitably increased, if discrete inductors are still used, a volume is greatly increased, and a larger space is occupied, so an integrated structure is adopted, which may effectively reduce the volume of a magnetic core, and improve efficiency.
  • existing integrated inductors do not provide solutions for the problems such as uneven heat dissipation and efficiency of the actual magnetic parts.
  • An embodiment of the present application mainly aims to propose an inductor, and an inductance having different proportions of magnetic losses and copper losses may be set according to different heat dissipation conditions of the environment in which the inductor is located, thereby realizing the differentiated design of the inductor.
  • an embodiment of the present application provides an inductor, including: a plurality of coils and a magnetic core;
  • the magnetic core includes: an upper bottom plate and a lower bottom plate, which are arranged in parallel up and down, a plurality of winding columns, which are located between the upper bottom plate and the lower bottom plate, and around which the plurality of coils are wound, and at least one non-winding column, which is arranged between the upper bottom plate and the lower bottom plate; and the numbers of turns of coils on at least two of the winding columns are different, directions of currents in the coils are opposite, there are air gaps in the at least two winding columns, around which the coils are wound for different numbers of turns, and the sizes of the air gaps in the winding columns are different.
  • the inductor proposed by the present application includes the plurality of coils and the magnetic core.
  • the magnetic core includes: the upper bottom plate and the lower bottom plate, which are arranged in parallel up and down, the plurality of winding columns, which are located between the upper bottom plate and the lower bottom plate, and around which the plurality of coils are wound, and at least one non-winding column, which is arranged between the upper bottom plate and the lower bottom plate, wherein the numbers of turns of coils on at least two winding columns are different, and the directions of the currents in the coils are opposite; and there are air gaps in the at least two winding columns, around which the coils are wound for different numbers of turns, and the sizes of the air gaps in the winding columns are different.
  • the present scheme may adjust the proportions of the magnetic losses and the copper losses by arranging at least two winding coils with different numbers of turns and different sizes of the air gaps, so that the inductor with different turn ratios may be arranged according to different heat dissipation conditions of the environment, thereby realizing the differentiated design.
  • inductors especially a high-power converter adopts an interleaving technology, which may effectively reduce a current ripple and achieve a higher power density and efficiency, so the number of magnetic parts required will be inevitably increased, if discrete inductors are still used, a volume is greatly increased, and a larger space is occupied, so an integrated structure is adopted, which may effectively reduce the volume of a magnetic core, and improve efficiency.
  • the following contents of the present embodiment are mainly aimed at the problems such as uneven heat dissipation and efficiency of actual magnetic parts, and differential design is proposed by combining the copper losses and magnetic losses of the magnetic parts.
  • an inductor includes: a plurality of coils 1 and a magnetic core 2; and the magnetic core 2 includes: an upper bottom plate 21 and a lower bottom plate 22, which are arranged in parallel up and down, a plurality of winding columns 23, which are located between the upper bottom plate 21 and the lower bottom plate 22, and around which the plurality of coils 1 are wound, and at least one non-winding column 24, which is arranged between the upper bottom plate 21 and the lower bottom plate 22.
  • the numbers of turns of the coils 1 on at least two winding columns 23 are different, directions of currents in the coils 1 are opposite, there are air gaps 10 in the at least two winding columns 23, around which the coils are wound for different numbers of turns, and the sizes of the air gaps 10 in the winding columns 23 are different.
  • the air gaps 10 are located at positions of the winding columns 23 away from the upper bottom plate 21 and the lower bottom plate 22, and each winding column 23 is connected with the upper bottom plate 21 and the lower bottom plate 22.
  • the air gaps 10 are located at positions of middle regions of the winding columns 23, and each winding column 23 is connected with the upper bottom plate 21 and the lower bottom plate 22.
  • the air gaps 10 are single-segment air gaps 10 or multi-segment air gaps 10.
  • the magnetic core 2 includes the non-winding column 24, the winding columns 23, the upper bottom plate 21 and the lower bottom plate 22, and a material of the magnetic core 2 includes ferrite, an amorphous body, a magnetic powder core or silicon steel.
  • materials of the non-winding column 24, the winding columns 23, the upper bottom plate 21 and the lower bottom plate 22 may be the same or different, the upper bottom plate 21 and the lower bottom plate 22 may be in a plate shape, two ends of each winding column 23 in the plurality of winding columns 23 are connected to the upper bottom plate 21 and the lower bottom plate 22 respectively, and two ends of at least one non-winding column 24 are connected to the upper bottom plate 21 and the lower bottom plate 22 respectively.
  • the non-winding column 24, the winding columns 23, the upper bottom plate 21 and the lower bottom plate 22 are integrally formed.
  • the upper bottom plate 21 and the lower bottom plate 22 may adopt a hexagonal structure or other polygonal structures, and the winding columns 23 and the non-winding column 24 may be in an elliptic, circular, or polygonal columnar shape.
  • the actual inductor is applied to a communication power supply or other switching power supply, and whether it is a natural heat dissipation or air-cooled heat dissipation environment, the inductor has an air duct near surface and an air duct leeward surface, or is near a heat source or away from the heat source.
  • the differential optimal design may be carried out according to the actual situation. For example, in the case of the air duct near surface and a good heat dissipation effect, the number of turns of the coils 1 on the winding columns 23 may be appropriately increased, and the air gaps 10 may be enlarged to reduce the magnetic loss. Or, in the case of the air duct far surface and a poor heat dissipation effect, the number of winding turns on the winding columns 23 may be reduced to reduce the copper loss.
  • differentiated design may be carried out for heat dissipation and efficiency consideration, the magnetic loss and the copper loss are compromised, and the utilization rate of the inductor is improved while the heat dissipation problem is taken into account.
  • the numbers of turns of the coils 1 on at least two winding columns 23 in the inductor proposed in the present embodiment are different, and the directions of currents in the coils 1 are opposite; and there are air gaps 10 in the at least two winding columns 23, around which the coils are wound for different numbers of turns, and the sizes of the air gaps 10 in the winding columns 23 are different.
  • the numbers of turns of the coils 1 on at least two winding columns 23 are different, and the directions of the currents in the coils 1 are opposite, so that magnetic fluxes on the non-winding column 24 may be mutually attenuated. Based on this, a cross sectional area of the non-winding column 24 may be smaller than that of the winding columns 23, and reducing the volume of the non-winding column 24 can not only reduce the magnetic loss of the magnetic core 2, but also improve an integration degree of the inductor and reduce the volume of the inductor.
  • the magnetic core 2 In order to meet design requirements of power electronic products, it is usually necessary to polish the magnetic core 2 to form the air gaps 10 to adjust the inductance capacitance of the product.
  • the effect of the air gaps 10 is to reduce the permeability so that coil characteristics are less dependent on the initial permeability of the material of the magnet core 2.
  • the air gaps 10 can avoid the phenomenon of magnetic saturation under an alternating-current large signal or direct-current bias, and the inductance capacitance is better controlled.
  • the air gaps 10 reduce the permeability, more turns of coils 1 are required, a relevant copper loss is also increased, so appropriate compromises are needed.
  • the sizes of the air gaps 10 in the two winding columns 23 are also different in order to make inductance values formed by the coils 1 on the two winding columns 23 be similar.
  • the proportion of the magnetic loss and the copper loss may be adjusted compared with original inductors with the same number of turns and the same air gaps 10, so that in actual use, the inductors with different turn ratios may be arranged according to different heat dissipation conditions of the environment, and differentiated design is realized.
  • the inductor in the present embodiment is illustrated in detail in combination with a specific example:
  • the number of the winding columns 23 is two, the numbers of turns of the coils 1 on the two winding columns 23 are different, the two winding columns 23 are a first winding column 231 and a second winding column 232; and the number of turns of the coil 1 wound on the first winding column 231 is greater than the number of turns of the coil 1 wound on the second winding column 232, and the air gap 10 in the second winding column 232 is smaller than the air gap 10 in the first winding column 231.
  • the magnetic core 2 includes the upper bottom plate 21, the lower bottom plate 22, two winding columns 23, and two non-winding columns 24.
  • the two winding columns 23 are the first winding column 231 and the second winding column 232 respectively, a first coil 11 is on the first winding column 231, a second coil 12 is on the second winding column 232, and the number of turns of the first coil 11 is greater than the number of turns of the second coil 12, so that magnetic field strength on the first winding column 231 may be increased.
  • the first winding column 231 includes a first air gap 101
  • the second winding column 232 includes a second air gap 102.
  • the first air gap 101 is greater than the second air gap 102, so that magnetoresistance on the first winding column 231 may be increased.
  • a value of a first inductance formed by the first winding column 231 and the first coil 11 is close to a value of a second inductance formed by the second winding column 232 and the second coil 12.
  • first winding column 231 and the coil 1 form the first inductance
  • second winding column 232 and the coil 1 form the second inductance
  • magnitudes of values of the first and second inductances are the same.
  • the inductor shown in Fig. 2 is provided in the present embodiment, the number of turns of the first coil 11 on the first winding column 231 is the same as the number of turns of the second coil 12 on the second winding column 232, and the sizes of the air gaps 10 in the first winding column 231 and the second winding column 232 are the same. It is supposed that the turn ratio of the first coil 11 to the second coil 12 in the inductor shown in Fig. 2 is 3:3, while the turn ratio of the first coil 11 to the second coil 12 in the inductor shown in Fig. 1 in the present embodiment is 5:3.
  • the simulating calculation of losses of magnetic cores 2 of the inductor under two turn ratios is shown in Fig.
  • the loss of the magnetic core 2 is reduced significantly after increasing the number of turns on a certain winding column 23 and increasing the air gap 10.
  • the copper loss is power consumed on a resistance of a primary secondary winding when the current passes through the primary secondary winding of a transformer, and it may be determined that the copper loss is increased after the number of turns on a certain winding column 23 is increased and the air gap 10 is enlarged. This also proves correctness of the above theory studied by the inventor on the other hand.
  • the number of the winding columns 23 is two, and the two winding columns 23 and the two non-winding columns 24 are arranged in a row, and a specific arranging mode of the winding columns 23 and non-winding columns 24 is given.
  • the number of the non-winding columns 24 is two, and the plurality of winding columns 23 are located between the two non-winding columns 24; and the coils 1 on the plurality of the winding columns 23 are arranged in such a way that the magnetic fluxes formed in two non-winding columns 24 cancel each other.
  • the magnetic fluxes formed by the coils 1 on the plurality of winding columns 23 on the two non-winding columns 24 may cancel each other, so that the cross-sectional area of the non-winding columns 24 may be less than that of the winding columns 23, and reducing the volume of the non-winding columns 24 can not only reduce the magnetic loss of the magnetic core 2, but also improve the integration degree of the inductor and reduce the volume of the inductor.
  • the number of the winding columns 23 shown in Fig. 4 is for example only and should not be used as a limitation on the number of the winding columns 23 in the accompanying drawings.
  • the number of the winding columns 23 may be three or more.
  • the magnetoresistance of the non-winding columns 24 is less than that of the winding columns 23. That is, there is no air gap 10 in side columns in the present embodiment.
  • winding on the winding columns 23 causes the current to generate the magnetic fluxes with opposite directions and the same size on the two winding columns 23, and since the same air gaps 10 are formed in the two winding columns 23, there is no air gap 10 in the non-winding columns 24, so that the magnetic fluxes of the two winding columns 23 cancel each other on the non-winding columns 24, thus, the cross-sectional area of the two non-winding columns 24 may be reduced, and then the volume of the magnetic core 2 may be reduced.
  • the loss of the magnetic core 2 may be reduced compared with an inductor with a large cross-sectional area, and the circuit efficiency may be improved. Reducing the cross-sectional area of the non-winding columns 24 will not block the heat dissipation of the winding columns 23.
  • differentiated adjustment of the number of turns and differentiated adjustment of the side columns may also be carried out, respective corresponding optimization is performed considering that actual heat dissipation situations of two integrated inductors are different, so that the coils 1 and magnetic core 2 of a magnetic element may be used to the maximum degree.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
EP22836679.5A 2021-07-07 2022-06-14 Inductor Pending EP4345853A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110766403.7A CN115602424A (zh) 2021-07-07 2021-07-07 一种电感器
PCT/CN2022/098775 WO2023279925A1 (zh) 2021-07-07 2022-06-14 一种电感器

Publications (1)

Publication Number Publication Date
EP4345853A1 true EP4345853A1 (en) 2024-04-03

Family

ID=84801236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22836679.5A Pending EP4345853A1 (en) 2021-07-07 2022-06-14 Inductor

Country Status (3)

Country Link
EP (1) EP4345853A1 (zh)
CN (1) CN115602424A (zh)
WO (1) WO2023279925A1 (zh)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3381531B2 (ja) * 1996-10-29 2003-03-04 松下電器産業株式会社 チョークコイルおよびそれを用いたスイッチング電源
CN102360863B (zh) * 2011-11-08 2013-10-16 田村（中国）企业管理有限公司 磁集成双电感器
CN103730230B (zh) * 2014-01-20 2016-03-16 田村（中国）企业管理有限公司 磁集成电感器
CN107610880A (zh) * 2017-10-19 2018-01-19 安徽大学 一种差模共模磁集成电感器
CN208834872U (zh) * 2018-09-21 2019-05-07 安徽动力源科技有限公司 一种磁集成电感
CN114255976A (zh) * 2020-09-21 2022-03-29 中兴通讯股份有限公司 一种集成电感及集成电路

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Publication number Publication date
WO2023279925A1 (zh) 2023-01-12
CN115602424A (zh) 2023-01-13

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