WO2022024585A1 - 非接触給電に用いられる伝送コイル - Google Patents

非接触給電に用いられる伝送コイル Download PDF

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Publication number
WO2022024585A1
WO2022024585A1 PCT/JP2021/023350 JP2021023350W WO2022024585A1 WO 2022024585 A1 WO2022024585 A1 WO 2022024585A1 JP 2021023350 W JP2021023350 W JP 2021023350W WO 2022024585 A1 WO2022024585 A1 WO 2022024585A1
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WIPO (PCT)
Prior art keywords
coil
magnetic
magnetic material
transmission coil
height
Prior art date
Application number
PCT/JP2021/023350
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English (en)
French (fr)
Japanese (ja)
Inventor
将也 ▲高▼橋
英介 高橋
和弘 宇田
宜久 山口
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株式会社デンソー
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Publication of WO2022024585A1 publication Critical patent/WO2022024585A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present disclosure relates to a transmission coil used for non-contact power feeding.
  • Japanese Patent Application Laid-Open No. 2019-110252 discloses an example of a transmission coil used for non-contact power feeding.
  • This transmission coil includes a substrate and a coil arranged on the substrate and wound in a spiral shape, and by providing magnetic materials on both side surfaces and both ends of the coil conductor cross section of the coil, a skin effect and a proximity effect can be obtained.
  • the high frequency loss due to the above is reduced and the increase of AC resistance is suppressed.
  • the transmission coil having the above structure has a problem that the AC resistance is increased by the magnetic field generated from the inner corner portion of the magnetic material in the magnetic path of the magnetic material provided on both side surfaces and both ends of the coil conductor cross section. be.
  • a transmission coil 10 used for non-contact power feeding is provided.
  • the transmission coil (10) is a coil (24) composed of a wound coil conductor (21) and having one surface (23) intersecting with magnetic flux and the other surface (24) opposite to the one surface. 20, 20C), the first magnetic material (30) arranged on the one surface (23), the inner peripheral side surface (25) and the outer peripheral side of the coil intersecting the one surface and the other surface.
  • a second magnetic body (40) arranged on the side surface (26) of the above, and the second magnetic body is a magnetic body portion (44) in which magnetic flux entering and exiting between the second magnetic body and the external space is concentrated. ) Is configured to be separated from the other surface (24).
  • the magnetic material portion where the magnetic flux entering and exiting between the second magnetic material and the external space is concentrated is provided so as to be separated from the other surface in contact with the external space.
  • FIG. 1 is a schematic plan view showing the configuration of the transmission coil of the first embodiment.
  • FIG. 2 is a schematic cross-sectional view showing a 2-2 cross section of the transmission coil of FIG.
  • FIG. 3 is an enlarged schematic cross-sectional view of a part of the transmission coil of FIG.
  • FIG. 4 is an explanatory diagram showing a problem of the configuration without the second magnetic material.
  • FIG. 5 is an explanatory diagram showing a problem when the heights of the second magnetic material and the coil are equal to each other.
  • FIG. 6 is an explanatory diagram showing the effect of the configuration of the embodiment.
  • FIG. 7 is an explanatory diagram showing the effect of the configuration of FIG. 6 in comparison with the configurations of FIGS. 4 and 5.
  • FIG. 8 is an explanatory diagram showing a modified example of the shape of the second magnetic material.
  • FIG. 9 is an explanatory diagram showing another modification of the shape of the second magnetic material.
  • FIG. 10 is a graph showing the relationship between the thickness of the second magnetic material and the AC resistance.
  • FIG. 11 is a graph showing the relationship between the height of the second magnetic material and the AC resistance.
  • FIG. 12 is a graph showing the relationship between the relative permeability of the second magnetic material and the AC resistance.
  • FIG. 13 is a schematic cross-sectional view showing the configuration of the transmission coil of the second embodiment.
  • FIG. 14 is a graph showing the relationship between the distance between the second magnetic material and the coil and the AC resistance.
  • FIG. 15 is a schematic cross-sectional view showing the configuration of the transmission coil of the third embodiment.
  • FIG. 16 is an explanatory diagram showing an example in which a transmission coil is applied to a non-contact power feeding device for a vehicle.
  • the transmission coil 10 for non-contact power feeding as the first embodiment shown in the schematic plan view of FIG. 1 and the schematic cross-sectional view of FIG. 2 has the coil 20 and one surface 23 and the other surface 24 intersecting with the magnetic flux of the coil 20.
  • a first magnetic body 30 arranged on one surface 23 of the coil 20 and a second magnetic body 40 arranged on the inner peripheral side surface 25 and the outer peripheral side surface 26 of the coil 20 are provided.
  • the second magnetic body 40 on the inner circumference may be referred to as a "second magnetic body 40i”
  • the second magnetic body 40 on the outer circumference may be referred to as a "second magnetic body 40o".
  • the coil 20 has a coil conductor 21 formed in a helical shape by forming printed wiring such as aluminum or copper in a layer of each substrate made of a resin 22. It consists of a printed circuit board. One surface 23, the other surface 24 opposite to one surface 23, one surface 23, the other surface 24, the inner peripheral side surface 25 of the coil 20, and the outer peripheral side surface 26 are covered with the resin 22. It has been done.
  • One surface 23 of the coil 20 is the surface on one end side of the wound coil conductor 21, and the other surface 24 on the other side is the surface on the other end side of the wound coil conductor 21.
  • a resin 22 covering the coil conductor 21 is interposed on the surface on one end side and the surface on the other end side.
  • the inner peripheral side surface 25 and the outer peripheral side surface 26 of the coil 20 are the inner peripheral side surface and the outer peripheral side surface of the laminated coil conductor 21.
  • a resin 22 covering the coil conductor 21 is interposed on the inner peripheral side surface and the outer peripheral side surface of the coil conductor 21.
  • the coil 20 is not limited to the coil made of the printed circuit board as described above, and various coils such as a coil wound with a litz wire and an edgewise coil obtained by winding a flat wire in an edgewise manner can be used. Can be used.
  • a magnetic material having a high magnetic permeability for example, PC95 (TDK), which is a Mn—Zn-based ferrite, can be used.
  • PC95 TDK
  • Mn—Zn-based ferrite Mn—Zn-based ferrite
  • the present invention is not limited to this, and various magnetic materials can be used.
  • the magnetic permeability of the second magnetic material 40 will be described later.
  • the first magnetic material 30 is provided so as to cover the entire coil 20 on the one surface 23 side and to be in contact with the one surface 23.
  • the second magnetic body 40 is provided so that the second magnetic body 40i is in contact with the side surface 25 and the first magnetic body 30 on the inner circumference of the coil 20, and the second magnetic body 40o is provided. It is provided so as to be in contact with the side surface 26 of the outer periphery of the coil 20 and the first magnetic body 30.
  • the second magnetic body 40 has a second so that the end edge portion 44 facing the coil 20 side is separated from the other surface 24 of the coil 20 by a distance dh (dh is larger than 0). 2 It has a structure in which the height hm of the magnetic body 40 is higher than the height hc of the coil 20. The height hm and width wm of the second magnetic material 40 will be described later.
  • the transmission coil 10 suppresses the increase in AC resistance described in the problem as described below. Can be done.
  • the magnetic flux density at the end of the coil 20 becomes high, and the magnetic flux interlinking the coil 20 is shown in FIG. It penetrates the side end portion of the coil 20 so as to.
  • the magnetic flux interlinking the side end of the coil 20 generates an eddy current, which causes an increase in the current density of the side end of the coil 20, as shown in the lower left column of FIG.
  • This increase in current density leads to an increase in loss (eddy current loss), that is, an increase in AC resistance of the coil 20.
  • the magnetic flux density of the second magnetic body 40 becomes high as shown in the upper center column of FIG. 7, and the coil 20 is formed.
  • the interlinking magnetic flux (see FIG. 4) can be induced in the second magnetic body 40 as shown in FIG. Therefore, in the case of the configuration provided with the second magnetic body 40, it is possible to reduce the increase in the AC resistance of the coil 20 generated by the magnetic flux interlinking the side end portions of the coil 20.
  • the magnetic flux entering and exiting between the second magnetic body 40 and the external space is concentrated.
  • the edge portion 44 is separated from the other surface 24. Since the magnetic flux between the edge portion 44 and the other surface 24 is attenuated by the square of the distance (interval), the case where the edge portion 44 is close to the other surface 24 (see FIG. 5).
  • the increase in the magnetic flux density in the space between the edge portion 44 and the end portion of the other surface 24 can be significantly reduced, and the leakage flux can be significantly reduced. It is possible to reduce.
  • the increase in the current density at the side end of the coil 20 on the other surface 24 side is significantly reduced, and the loss (eddy current loss) is significantly reduced, that is, ,
  • the AC resistance of the coil 20 can be significantly reduced.
  • the second magnetic material 40 may have a chamfered edge portion 44.
  • the second magnetic body 40 may have a shape in which the end edge portion 44 is bent toward the coil 20 side.
  • the second magnetic body 40 may have a shape such that the edge portion 44 where the magnetic flux entering and exiting from the external space is concentrated is separated from the other surface 24 of the coil 20.
  • the thickness wm of the second magnetic body 40 on the horizontal axis is represented by a relative value wm / wr with respect to the set thickness wr, and the AC resistance Rac on the vertical axis is relative to the AC resistance Rwr at the set thickness wr. It is represented by the value Rac / Rwr.
  • the thickness Wm of the second magnetic material 40 has almost no effect on the AC resistance Rac. Therefore, the thickness wm of the second magnetic body 40 may be set to a size that does not cause magnetic saturation. For example, it may be set to the minimum size within a range where magnetic saturation does not occur.
  • the height hm of the second magnetic body 40 is set in the range of 1 ⁇ hm / hc ⁇ 3, the effect of sufficiently reducing the AC resistance can be obtained while suppressing the increase in the physique of the entire transmission coil in the height direction. Obtainable.
  • the AC resistance Rac is represented by a relative value Rac / Rr with respect to the AC resistance Rr when there is no magnetic material.
  • a magnetic material using the same magnetic material PC95 as the first magnetic material 30 as the second magnetic material 40 has been described as an example, but it is flexible and installed like, for example, a flexible magnetic material sheet.
  • a magnetic material having a low relative magnetic permeability ⁇ r can be used as the second magnetic material.
  • the transmission coil 10B of the second embodiment shown in the schematic cross-sectional view of FIG. 13 has a coil 20, a first magnetic body 30, and a second magnetic body, similarly to the transmission coil 10 of the first embodiment (see FIG. 3). 40 (40i, 40o) and the like.
  • the height hm of the second magnetic body 40 of the transmission coil 10 is higher than the height hc of the coil 20, whereas the height hm of the second magnetic body 40 of the transmission coil 10B is the height hc of the coil 20.
  • the difference is that the configuration is equal to.
  • the second magnetic body 40 of the transmission coil 10B is different from the side surface 25 on the inner peripheral side and the side surface 26 on the outer peripheral side of the coil 20 so as to be laterally separated by an interval ds.
  • the interval ds is the distance between the end of the coil conductor 21 and the height of the coil 20 (strictly speaking, the height of the laminated coil conductors 21). If the thickness of 22 is sufficiently thin, the distance from the side surface of the coil 20 may be used.
  • the edge portion 44 can be separated from the other surface 24 of the coil 20.
  • the increase in AC resistance can be suppressed as in the first embodiment.
  • the AC resistance Rac can be lowered by arranging the second magnetic material 40 away from the coil 20 with ds / hc> 0.
  • the effect of reducing the AC resistance Rac can be maximized.
  • ds> hc> 2 and the second magnetic material 40 is too far from the coil 20 the effect of reducing the AC resistance Rac cannot be obtained. This is because the effect of inducing the magnetic flux by the second magnetic body 40 cannot be obtained, and the configuration is the same as that without the second magnetic body 40 (see FIG. 4).
  • the above-mentioned transmission coil 10B has a configuration in which the height hm of the second magnetic body 40 is equal to the height hc of the coil 20 as an example, the height of the second magnetic body 40 is the same as in the first embodiment.
  • the hm may be higher than the height hc of the coil 20.
  • the second magnetic body 40 is separated from the coil 20.
  • the limitation regarding the height hm of the second magnetic body 40 and the limitation regarding the specific magnetic permeability ⁇ r of the second magnetic body 40 described in the first embodiment can be similarly applied to the transmission coil 10B.
  • the transmission coil 10C the magnetic flux passing through both ends of the coil conductor 21 is guided to the second magnetic body 40, and the edge portion 44 where the magnetic flux is concentrated is on the surface of each coil conductor 21, that is, on the other side of the coil 20C.
  • the transmission coil 10C it is required to arrange the second magnetic material on the side surface of each coil conductor 21. Therefore, the configuration using the coil 20 wound in a helical shape as in the transmission coil 10 of the first embodiment can reduce the number of the second magnetic materials arranged on the inner peripheral and outer peripheral side surfaces of the coil. It is advantageous in that.
  • the transmission coil described in each of the above embodiments can be used as a power transmission coil or a power receiving coil for non-contact power feeding.
  • the power feeding device 100 It is applicable to the power transmission coil 110 of.
  • the DC power supplied from the power supply circuit 130 is converted into AC power by the power transmission circuit 120, and the converted AC power is supplied to the power transmission coil 110.
  • the AC power induced in the power receiving coil 210 by the magnetic field coupling between the power transmitting resonance circuit including the power transmitting coil 110 and the power receiving resonance circuit including the power receiving coil 210 is generated by the power receiving circuit 220. Is converted into DC power and charged in the battery 230. As a result, power is supplied from the power feeding device 100 to the power receiving device 200 in a non-contact manner.
  • FIG. 16 shows an example in which the transmission coil 10 of the first embodiment is applied to the transmission coil 110.
  • the power transmission coil 110 is a layer PL below the surface layer AL paved with asphalt or the like of the vehicle travel path RS, and is covered with resin or the like and installed.
  • the configuration in which the transmission coil 10 of the first embodiment is applied to the power transmission coil 110 of the power feeding device 100 has been described as an example, but the transmission coil of another embodiment may be applied to the power transmission coil 110. good. It is also possible to apply the transmission coil of the above embodiment to the power receiving coil 210.
  • the present disclosure is not limited to the above-described embodiment, and can be realized by various configurations within a range not deviating from the purpose.
  • the technical features in the embodiments corresponding to the technical features in each embodiment described in the column of the outline of the invention are for solving a part or all of the above-mentioned problems, or one of the above-mentioned effects. It is possible to replace or combine as appropriate to achieve the part or all. Further, if the technical feature is not described as essential in the present specification, it can be appropriately deleted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
PCT/JP2021/023350 2020-07-29 2021-06-21 非接触給電に用いられる伝送コイル WO2022024585A1 (ja)

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JP2020-128041 2020-07-29
JP2020128041A JP7552119B2 (ja) 2020-07-29 2020-07-29 非接触給電に用いられる伝送コイル

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025033554A1 (ja) * 2023-08-10 2025-02-13 大日本印刷株式会社 コイルユニット、送電装置、受電装置、電力伝送システム及び移動体

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013021902A (ja) * 2011-06-15 2013-01-31 Tdk Corp 非接触伝送デバイス、並びにそれを備えるバッテリユニット及びバッテリリッドユニット
WO2017145659A1 (ja) * 2016-02-26 2017-08-31 株式会社村田製作所 アンテナ装置および電子機器
WO2019189138A1 (ja) * 2018-03-29 2019-10-03 パナソニックＩｐマネジメント株式会社 伝送モジュールおよび無線電力データ伝送装置
JP2020047766A (ja) * 2018-09-19 2020-03-26 株式会社豊田中央研究所 トランス、バッテリ充電装置およびコネクタ
JP2020047614A (ja) * 2018-09-14 2020-03-26 国立大学法人信州大学 ワイヤレス電力伝送コイルユニット
JP2020098919A (ja) * 2015-09-24 2020-06-25 株式会社Ｆｕｊｉ 受電コイルおよび非接触給電システム
WO2020174864A1 (ja) * 2019-02-28 2020-09-03 富士フイルム株式会社 給電部材、コイル配置用磁性シート、及びコイル配置用磁性シートの製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013021902A (ja) * 2011-06-15 2013-01-31 Tdk Corp 非接触伝送デバイス、並びにそれを備えるバッテリユニット及びバッテリリッドユニット
JP2020098919A (ja) * 2015-09-24 2020-06-25 株式会社Ｆｕｊｉ 受電コイルおよび非接触給電システム
WO2017145659A1 (ja) * 2016-02-26 2017-08-31 株式会社村田製作所 アンテナ装置および電子機器
WO2019189138A1 (ja) * 2018-03-29 2019-10-03 パナソニックＩｐマネジメント株式会社 伝送モジュールおよび無線電力データ伝送装置
JP2020047614A (ja) * 2018-09-14 2020-03-26 国立大学法人信州大学 ワイヤレス電力伝送コイルユニット
JP2020047766A (ja) * 2018-09-19 2020-03-26 株式会社豊田中央研究所 トランス、バッテリ充電装置およびコネクタ
WO2020174864A1 (ja) * 2019-02-28 2020-09-03 富士フイルム株式会社 給電部材、コイル配置用磁性シート、及びコイル配置用磁性シートの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025033554A1 (ja) * 2023-08-10 2025-02-13 大日本印刷株式会社 コイルユニット、送電装置、受電装置、電力伝送システム及び移動体

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