WO2012132535A1 - 受電コイル、受電装置及び非接触電力伝送システム - Google Patents
受電コイル、受電装置及び非接触電力伝送システム Download PDFInfo
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- WO2012132535A1 WO2012132535A1 PCT/JP2012/052142 JP2012052142W WO2012132535A1 WO 2012132535 A1 WO2012132535 A1 WO 2012132535A1 JP 2012052142 W JP2012052142 W JP 2012052142W WO 2012132535 A1 WO2012132535 A1 WO 2012132535A1
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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
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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
- H01F27/2823—Wires
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
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- 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
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- 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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- 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
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- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- 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
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
Definitions
- the present disclosure relates to a power receiving coil that transmits power from an electromagnetically coupled power transmitting coil, a power receiving device including the power receiving coil, and a contactless power transmission system using the power receiving device.
- the power reception coil built in the power reception device is used in the metal inside the device (for example, in a case or circuit) ) Greatly deteriorates the Q value.
- the Q value is an index indicating the relationship between energy retention and loss, or the strength of resonance of the resonance circuit.
- a magnetic sheet is pasted on the back of the spiral shaped power transmission coil and power reception coil.
- This magnetic sheet needs a certain thickness in order to prevent the influence of the metal inside the apparatus.
- a magnetic sheet having a size much larger than that of the coil is required.
- This magnetic sheet is generally made of ferrite (sintered body). Therefore, to make a magnetic sheet thin, a ferrite sheet is thinly formed, laminated with thin resin sheets on the upper and lower sides, and then cut into fine pieces, which is very expensive. Since this ferrite magnetic sheet is matched to the coil as described above, it has a large area and a large variation in thickness and the like, and the variation in the constant of the coil resulting therefrom has caused a large deterioration in the Q value.
- the power transmission efficiency (also referred to as “coil efficiency”) ( ⁇ rf ) is the coupling coefficient k, which is the degree of coupling between the transmitting coil and the receiving coil, and Q values of the power transmission coil (Q 1), theoretically can be uniquely determined from the Q-value of the receiving coil (Q 2).
- the coupling coefficient k between the power transmission coil and the power reception coil is large, that is, in the case of electromagnetic induction, the sizes of the power transmission coil and the power reception coil, such as the winding diameter, are substantially the same, and the Q values (Q 1 , Q 2 ) Is small, power can be transmitted.
- the inter-coil efficiency ( ⁇ rf ) in the case of electromagnetic induction depends on the coupling coefficient k, the positional accuracy between the power transmitting coil and the power receiving coil is very important, and positional deviation is not allowed. Therefore, when charging in the case of electromagnetic induction, the power transmission coil and the power reception coil have a one-to-one correspondence.
- the coupling coefficient k between the power transmission coil and the power reception coil is reduced, the Q value as a resonator is increased to transmit power to a plurality of electronic devices, and the power reception coil A method for arranging the symbols freely has been proposed.
- Japanese Patent No. 4413236 Japanese Patent Laid-Open No. 2008-206231
- the power receiving coil mounted on the electronic device is smaller than the size of the power transmission coil, the Q value is not as large as about 50, and deteriorates in order to increase the degree of freedom of arrangement with respect to the power transmission coil. It was difficult to realize a contactless power transmission system.
- the present disclosure has been made in consideration of the above situation, and increases the Q value of the power receiving coil used in the power receiving apparatus, and reduces deterioration of the Q value of the power receiving coil when the power receiving coil is placed inside the housing. Is.
- the power receiving coil according to the present disclosure includes a core having a magnetic body, a coil portion around which a wire is wound and electromagnetically coupled to an external coil to transmit power, and a certain distance from a side surface of the coil portion. And a non-magnetic material disposed apart from each other. As an example, the thickness of the nonmagnetic material is 0.3 mm or more. Moreover, the resin part which incorporates the core which has the said magnetic body, and a coil part is provided, and the nonmagnetic body is arrange
- the core has an H shape.
- the power receiving device of the present disclosure includes the power receiving coil and a power receiving unit that receives an AC signal through the coil unit.
- the non-contact power transmission system of the present disclosure includes a power transmission device that generates an AC signal and the power reception device that receives the AC signal generated by the power transmission device.
- the power transmission device includes a power transmission coil unit in which a wire is wound in a planar shape, and a power transmission unit that supplies an AC signal to the power transmission coil unit.
- the Q value can be increased by forming a coil portion by winding a wire around a core having a magnetic body. Further, by disposing the non-magnetic material at a position away from the side surface of the coil portion by a certain distance, deterioration of the Q value when the coil portion is placed inside a metal-rich housing can be suppressed.
- the present disclosure it is possible to increase the Q value of the power receiving coil used in the power receiving device, and to reduce deterioration of the Q value of the power receiving coil when the power receiving coil is placed inside the housing.
- FIG. (A)-(d) is explanatory drawing which shows the manufacturing process of the receiving coil shown in FIG.
- FIG. (A)-(d) is explanatory drawing which shows the manufacturing process of the receiving coil shown in FIG.
- FIG. (A)-(d) is explanatory drawing which shows the example of a combination of the conventional power transmission coil and power receiving coil.
- FIG. 1 is an external perspective view of a power receiving coil according to an embodiment of the present disclosure.
- FIG. 2 is a front view of the power receiving coil shown in FIG.
- This power receiving coil is a coil used on the power receiving side of a non-contact power transmission system that transmits power by electromagnetically coupling two coils.
- Electromagnetic coupling is also called “electromagnetic resonance coupling” or “electromagnetic resonance”, and includes electric field coupling and magnetic field coupling. In either case, resonance is used, and power is transmitted only to the resonating device by coupling of an electric field or a magnetic field.
- electromagnetic coupling will be described.
- the power receiving coil 1 of this example includes a Litz wire (in this example, a wire diameter of ⁇ 0%) In which a plurality of thin soft coppers are wound on a side-shaped H-shaped core (magnetic core) 2 made of a magnetic material (for example, ferrite). As an example, 15 wire rods 5 (in this example, wire diameter ⁇ 1.0 mm) are wound around a predetermined number of turns. Then, a nonmagnetic material 6 made of, for example, 0.5 mm thick aluminum (Al) is placed on the resin portion 3 confined together with the core 2 at a predetermined distance from the shaft core portion 2 a of the core 2. It is affixed in parallel with the axis (Z axis) of the part 2a. In the state where the nonmagnetic material 6 was attached, the inductance (L value) of the power receiving coil 1 was 7.61 ⁇ H and the Q value was 180.
- L value inductance
- an H-type core 2 is prepared in which flange portions 2b and 2c made of ferrite are attached to both ends of an axis portion 2a made of ferrite (FIG. 3A). Subsequently, the entire H-shaped core 2 is covered with resin, and the resin portion 3 is formed by a technique such as molding (FIG. 3B). At this time, the resin part 3 is molded so that the side surface 3a is at a predetermined distance from the central axis (Z-axis) of the axial part 2a of the core 2.
- a gap is formed between the side surface 3a of the resin portion 3 and the portion corresponding to the shaft core portion 2a of the core 2 in order to reduce the amount of resin used in the resin portion 3 and to reduce the weight of the power receiving coil 1.
- Part 4 is provided.
- the wire 5 is wound around the part corresponding to the axial part 2a of the core 2 of the molded resin part 3 (an example of a coil part) (FIG. 3C).
- the L value is adjusted by the number of turns.
- a plate-like nonmagnetic material 6 made of, for example, 0.5 mm thick aluminum is attached to the side surface 3 a of the resin portion 3 to complete the power receiving coil 1.
- aluminum is pasted as a nonmagnetic material, but a nonmagnetic material such as copper may be used.
- a nonmagnetic material such as copper may be used.
- one plate-like non-magnetic material is attached, it may be attached to two sides and three sides so as to surround the core 2.
- the rectangular plate-shaped nonmagnetic material nonmagnetic material is used, you may provide a nonmagnetic body around the axial center part 2a of the core 2 so that a cylinder may be followed.
- the shape of the core is the H type, but a similar result can be obtained even with the T type or the I type having a somewhat low coupling coefficient.
- the T-type is a shape in which only one of the flange portions 2b and 2c is attached to the core 2 in FIG.
- the I type refers to a shape in which neither of the flange portions 2b and 2c is attached, or the area thereof is smaller than that of the H type.
- the molded resin part 3 secures the distance between the shaft core part 2a of the core 2 and the non-magnetic material 6 (non-magnetic material such as metal). You may create by sticking a mold. If it demonstrates in the example of FIG.3 (b), the molded mold will be applied to the left side part from the space
- the cross-sectional shape of the shaft 2a of the core 2 is rectangular, but it may be circular.
- an amorphous alloy having a high magnetic permeability may be applied to the flange portions 2b and 2c.
- the amorphous alloy include a cobalt (Co) based amorphous alloy such as an Mg—Zn alloy.
- FIG. 4 is an explanatory view showing a combination example of a conventional power transmission coil and power reception coil.
- FIG. 5 is an explanatory diagram of a state in which a mobile terminal phone equipped with a conventional power receiving coil is arranged on the power transmitting coil.
- FIG. 6 is a graph showing the Q value of the primary coil when a portable terminal phone equipped with a conventional power receiving coil is moved on the power transmitting coil.
- a planar spiral power transmission coil 11 is used on the power transmission side, and the size of the power transmission coil 11 is 190 ⁇ 150 mm as an example.
- the power transmission coil 11 is an alpha winding that winds the wire material at the beginning and end of winding around the outer periphery of the coil. The space factor can be improved by winding with alpha.
- a planar spiral power receiving coil 15 is used on the power receiving side, and the size of the power receiving coil 15 is 40 ⁇ 30 mm as an example.
- the magnetic sheet 12 (190 ⁇ 150 mm) and the magnetic sheet 16 (40 ⁇ 30 mm) of ferrite of the same size as the respective coils are attached to the back surfaces (opposite surfaces of the pair of coils) of the power transmission coil 11 and the power reception coil 15. It has been. At this time, the Q value of the power transmission coil 11 was 230.5, the Q value of the power reception coil 15 was 59.5, and the coupling coefficient k was 0.096.
- the power receiving coil 15 was actually incorporated into the mobile phone terminal 21, and the mobile phone terminal 21 was moved on the power transmission coil 11 in the X direction and the Y direction for measurement.
- One corner of the rectangular coil shape is the origin.
- the Q value of the power transmission coil 11 changes from 230.5 to 58 (see FIG. 6).
- the Q value also deteriorated from 59.5 to 46.4.
- the efficiency between the coils of 84% was 54%, and the value of the coupling coefficient k deteriorated to 0.068, which was a value that could hardly be used practically.
- FIG. 7 is an explanatory diagram illustrating a combination of a power reception coil and a power transmission coil according to an embodiment of the present disclosure.
- FIG. 8 is a graph showing an example of S value-coil efficiency characteristics in the combination of the power receiving coil and the power transmitting coil shown in FIG.
- FIG. 9 is a graph showing an example of the distance-coil efficiency characteristic with respect to the primary coil in the combination of the power receiving coil and the power transmitting coil shown in FIG.
- the power receiving coil 1A used for the measurement shown in FIG. 7 has the same structure as the power receiving coil 1 in FIG. 1 except that the nonmagnetic material 6 is not present.
- the power receiving coil 1 ⁇ / b> A was incorporated in the mobile phone terminal 21, and the position of the mobile phone terminal 21 relative to the power transmission coil 11 was moved for measurement.
- the power receiving coil 1 ⁇ / b> A is disposed so that the central axis of the shaft core portion 2 a of the core 2 is parallel to the central axis (Z axis) of the planar power transmitting coil 11.
- the Q value (Q 1 ) of the power transmission coil 11 deteriorates similarly to the conventional example of FIG. 4, but as shown in FIG. 8, the Q value of the power reception coil 1A even if the power reception coil 1A is incorporated in the mobile phone terminal 21.
- the theoretical value of (Q 2 ) is 180, and it can be seen that there is almost no deterioration.
- the coupling coefficient k is 0.066, which is smaller than that of the conventional power receiving coil 15 (FIG. 4) that is a spiral coil.
- the Q value of the receiving coil 1A is not very high compared to the conventional one, and the inter-coil efficiency is 78%. As shown in FIG.
- the distance between the power receiving coil 1A and the power transmitting coil 11 was measured in a plurality of arrangements while changing the positional relationship on both XY planes, but no significant deterioration in inter-coil efficiency was observed. . Therefore, from the viewpoint of inter-coil efficiency, it can be said that even if it is incorporated in a set device, the degree of freedom of arrangement with respect to the power transmission coil is high and a very high level is realized.
- FIG. 10 shows a state in which the metal plate 26 is brought close to the side surface of the power receiving coil 1 ⁇ / b> A composed of the resin portion 3 ⁇ / b> A incorporating the core 2.
- FIG. 11 is a graph showing the characteristic of the Q value with respect to the distance between the power receiving coil 1 ⁇ / b> A (coil side surface) and the metal plate 26.
- measurement was performed using, for example, 0.5 mm thick aluminum (Al) and stainless steel (SUS) as the metal plate.
- the Q value of the power receiving coil 1 ⁇ / b> A tends to be deteriorated when the metal plate 26 exists nearby, and the Q value is deteriorated as the area of the metal plate is increased.
- metal materials aluminum and stainless steel have less deterioration in Q value in aluminum. This is presumably because non-magnetic material such as aluminum does not accumulate magnetic field lines, so eddy currents hardly flow and resistance to high-frequency signals increases. In the case of a non-magnetic material such as aluminum, it can be seen that the influence is reduced if it is separated from the coil wound around the core by about 10 mm.
- the measurement was performed using a non-magnetic material having a plate thickness of 0.5 mm, but the same result was obtained even in the case of a non-magnetic material such as aluminum or copper having a plate thickness of 0.3 mm. ing.
- a non-magnetic material having a plate thickness of 0.3 mm is advantageous for use in a housing having a limited design space such as a mobile phone terminal.
- the coupling coefficient k of the power transmission coil and the power reception coil is set to 0.2 or less, and the Q value of at least one of the primary side coil or the secondary side coil is set to 100 or more.
- the coupling coefficient k depends on the size of the primary coil in relation to the coil, and the coupling coefficient k increases as the size of the primary coil decreases. It is said.
- the power receiving coil of one embodiment using a wire for the core is less expensive than a conventional spiral coil. Furthermore, it is possible to manufacture a power receiving coil with less variation in the coil constant (for example, Q value) compared to a conventional spiral coil.
- a repeater coil for making the magnetic flux uniform may be formed in the power transmission coil 11, and power may be transmitted from the power transmission coil 11 to the power receiving coil 1 (1A) via the repeater coil.
- Another embodiment of the power receiving coil according to the present disclosure may have the following manufacturing process. First, the wire 5 covered with the H-shaped core 2 is wound (corresponding to FIG. 3C) (an example of a coil portion). The L value is adjusted by the number of turns. Next, the core 2 around which the wire 5 is wound is inserted into the case of the mold member formed of resin, and is fixed with an adhesive or the like (corresponding to FIG. 3B). Thereafter, the nonmagnetic material 6 is attached to the side surface of the mold member (corresponding to FIG. 3D)).
- the upper surface of the flange portion 2b of the H-shaped core 2 and the lower surface of the flange portion 2c are designed and manufactured so as to be flush with the upper surface and the lower surface of the case of the mold member.
- the height of the H-shaped core 2 and the height of the case of the mold member can be made the same, and thus the thickness can be reduced as compared with the case of molding with resin.
- FIG. 12 is a schematic configuration diagram of a contactless power transmission system including a power receiving coil and a power transmitting coil according to an embodiment of the present disclosure.
- FIG. 1 shows an example of the most basic circuit configuration (in the case of magnetic field coupling) of a non-contact power transmission system.
- the non-contact power supply system of this example includes a power transmission device 31 and a power reception device 41.
- the power transmission device 31 includes a signal source 32 including an AC power source 33 and a resistance element 34 that generate an AC signal, a capacitor 35, and a power transmission coil (primary coil) 15.
- the resistance element 34 illustrates the internal resistance (output impedance) of the AC power supply 33.
- the capacitor 35 and the power transmission coil 11 are connected to the signal source 32 so as to form a series resonance circuit (an example of a resonance circuit). Then, the capacitance value (C value) of the capacitor 35 and the inductance value (L value) of the power transmission coil 11 are adjusted so as to resonate at the frequency to be measured.
- the power transmission unit 37 including the signal source 32 and the capacitor 35 transmits power to the power receiving device 41 through the power transmission coil 11 in a non-contact manner (power transmission (power feeding)).
- the power receiving device 41 includes a charging unit 42 including a capacitor 43 (secondary battery) and a resistance element 44, a rectifying unit 48 that converts an AC signal into a DC signal, a capacitor 45, and a power receiving coil (secondary coil) 1.
- the resistance element 44 illustrates the internal resistance (output impedance) of the capacitor 43.
- the capacitor 45 and the power receiving coil 1 are connected to the charging unit 42 so as to form a series resonance circuit, and the capacitance value (C value) of the capacitor 45 and the inductance of the power receiving coil 1 are set so as to resonate at a frequency to be measured.
- the value (L value) is adjusted.
- the power receiving unit 47 including the charging unit 42, the rectifying unit 48, and the capacitor 45 is supplied with electric power from the outside through the power receiving coil 1 (power reception).
- FIG. 12 shows a basic circuit including a series resonance circuit, and therefore various configurations can be considered as long as the above-described circuit function is provided.
- the capacitor 43 is shown as an example of the load provided in the power receiving device 41, but is not limited to this example.
- the power receiving device 41 may include the signal source 32 (power transmission unit 37) and transmit power to the external device via the power receiving coil 1 in a non-contact manner. You may make it receive electric power supply from an external device via the coil 11 non-contactingly.
- various electronic devices such as a mobile phone terminal and a digital camera are applicable.
- the series resonance circuit is described as an example, but a parallel resonance circuit may be used as the resonance circuit.
- a parallel resonance circuit may be configured by connecting a first capacitor in series to a parallel circuit of the second capacitor and the power transmission coil 11.
- a parallel resonance circuit may be configured by connecting a second capacitor in parallel to the series circuit of the first capacitor and the power transmission coil 11. The Q value is calculated using the voltage V1 between the power transmission coil 11 and the first capacitor and the voltage V2 across the power transmission coil 11 obtained in the parallel resonance circuit.
- the series resonant circuit and the parallel resonant circuit described above are examples of the resonant circuit, and are not limited to these configurations.
- a substrate on which a capacitor is mounted may be attached to the nonmagnetic material of aluminum on the side surface of the receiving coil in order to adjust the L value and resonance frequency of the coil.
- both the capacitor for the series resonance circuit and the capacitor for the parallel resonance circuit may be attached to the substrate so that the user can select one of them.
- this technique can also take the following structures.
- a core having a magnetic material A coil portion in which a wire is wound around the core and electromagnetically coupled with an external coil to transmit power; A non-magnetic material disposed at a certain distance from the side surface of the coil portion; A power receiving coil.
- the power receiving coil according to (1) wherein a thickness of the nonmagnetic material is 0.3 mm or more.
- a core having a magnetic material A coil portion in which a wire is wound around the core and electromagnetically coupled with an external coil to transmit power; A non-magnetic material disposed at a certain distance from the side surface of the coil portion; A power receiving unit that receives an AC signal via the coil unit; A power receiving device.
- a power transmission device that generates an AC signal; and a power reception device that receives an AC signal generated by the power transmission device.
- the power transmission device is: A power transmission coil section in which a wire is wound in a planar shape; A power transmission unit for supplying an AC signal to the power transmission coil unit; With The power receiving device is: A core having a magnetic material; A power receiving coil unit in which a wire is wound around the core and electromagnetically coupled to the power transmitting coil unit to transmit electric power; A non-magnetic material disposed at a certain distance from the side surface of the power receiving coil unit; A power receiving unit that receives an AC signal through the power receiving coil unit; A contactless power transmission system. (7) The non-contact power transmission system according to (6), including a magnetic sheet disposed on a surface of the power transmission coil unit opposite to the power reception coil unit side.
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Abstract
Description
一例として、非磁性体の厚さが、0.3mm以上である。また、上記磁性体を有するコアとコイル部を内蔵する樹脂部を備え、その樹脂部の側面に非磁性体が配置されている。また、コアの形状がH型である。
上記送電装置は、線材が平面状に巻回された送電コイル部と、その送電コイル部に交流信号を供給する送電部とを備える。
1.一実施形態における受電コイルの構造(H型コアに導線を巻回した例)
2.従来の送電コイルと受電コイルの組み合わせ
3.一実施形態における送電コイルと受電コイルの組み合わせ
4.その他
まず、図1及び図2を参照して、本開示の一実施形態例(以下、「本例」ともいう)に係る受電コイルの構造を説明する。
図1は、本開示の一実施形態に係る受電コイルの外観斜視図である。また、図2は、図1に示す受電コイルの正面図である。この受電コイルは、2つのコイルを電磁的に結合させて電力の伝送を行う非接触電力伝送システムの受電側に用いられるコイルである。電磁結合は、「電磁界共振結合」あるいは「電磁共鳴」などとも呼ばれ、電界結合と磁界結合がある。いずれも共振(共鳴)を利用し、共振しているデバイスのみに電界もしくは磁界の結合で電力伝送を行う。以下の例では、電磁結合について説明する。
まず、フェライトからなる軸芯部2aの両端に、フェライトからなるフランジ部2b、2cが取り付けられたような、H型のコア2を作成する(図3(a))。
続いて、H型のコア2の全体を樹脂で覆うようにして、モールド等の手法により樹脂部3を成形する(図3(b))。このとき樹脂部3の側面3aが、コア2の軸芯部2aの中心軸(Z軸)に対して所定の距離となるように成形する。この例では、樹脂部3の樹脂の使用量を減らすため、及び受電コイル1の軽量化のために、樹脂部3の側面3aとコア2の軸芯部2aに対応する部分との間に空隙部4を設けている。
そして、その成形した樹脂部3のコア2の軸芯部2aに対応する部分に、線材5を巻き付ける(コイル部の一例)(図3(c)。巻き数でL値を調整する。
最後に、樹脂部3の側面3aに、例えば0.5mm厚のアルミニウムからなる板状の非磁性体6を貼り付けて、受電コイル1が完成する。
ここで、図4~図6を参照して、従来の送電コイルと受電コイルの組み合わせについて説明する。
図4は、従来の送電コイルと受電コイルの組み合わせ例を示す説明図である。また図5は、従来の受電コイルを搭載した携帯端末電話を送電コイルの上に配置した状態の説明図である。また図6は、従来の受電コイルを搭載した携帯端末電話を送電コイル上で移動させたときの一次側コイルのQ値を示すグラフである。
次に、図7~図9を参照して、本開示の送電コイルと受電コイルの組み合わせについて説明する。
図7は、本開示の一実施形態例に係る受電コイルと、送電コイルの組み合わせを示す説明図である。また図8は、図7の受電コイルと送電コイルの組み合わせにおける、S値-コイル間効率の特性の一例を示すグラフである。また図9は、図7の受電コイルと送電コイルの組み合わせにおける、1次側コイルとの距離-コイル間効率の特性の一例を示すグラフである。
次に、本開示の一実施形態に係る受電コイルと金属板間の距離について説明する。
図10は、コア2を内蔵した樹脂部3Aからなる受電コイル1A側面に金属板26を近づける様子を示している。また図11は、受電コイル1A(コイル側面)と金属板26間の距離に対するQ値の特性を示したグラフである。本例では、金属板として例えば0.5mm厚の、アルミニウム(Al)とステンレス鋼(SUS)を用いて測定した。
以上説明した一実施形態に係る受電コイル、及び該受電コイルと送電コイルの組み合わせによれば、送電コイルに対する受電コイルの配置の自由度があり、効率よく受電することが可能となる。すなわち、電子機器へ組み込み時の受電コイルのQ値の劣化を少なくし、送電コイル上に当該電子機器を置いたときに送電コイルのQ値が劣化する場合でも、配置自由度を確保して電力の伝送を実現できる。
(受電コイルの他の実施形態例)
本開示に係る受電コイルの他の実施形態例として、次のような製造工程を有するものも考えられる。
まず、H型のコア2に被覆された線材5を巻き付ける(図3(c)に対応)(コイル部の一例)。巻き数でL値を調整する。次に、樹脂で形成されたモールド部材のケースに線材5を巻き付けたコア2を挿入し、接着材等により固定する(図3(b)に対応)。その後、モールド部材の側面に非磁性体6を貼り付ける(図3(d)に対応))。ここで、H型のコア2のフランジ部2bの上面及びフランジ部2cの下面が、モールド部材のケースの上面及び下面と同一面となるように設計、製造する。このように受電コイルを製造した場合、H型のコア2の高さと、モールド部材のケースの高さを同じにすることができるので、樹脂でモールドする場合に比べ薄型化が可能である。
上述した本開示の受電コイルと送電コイルを用いた非接触電力伝送システムを説明する。
図12は、本開示の一実施形態に係る受電コイルと送電コイルをそれぞれ備える、非接触電力伝送システムの概略構成図である。この図1は、非接触電力伝送システムの最も基本的な回路構成(磁界結合の場合)の例を示している。
送電装置31は、交流信号を発生させる交流電源33及び抵抗素子34を含む信号源32と、コンデンサ35と、送電コイル(1次側コイル)15を備える。抵抗素子34は、交流電源33の内部抵抗(出力インピーダンス)を図示化したものである。信号源32に対しコンデンサ35と送電コイル11が直列共振回路(共振回路の一例)を形成するように接続されている。そして、測定したい周波数において共振するように、コンデンサ35のキャパシタンスの値(C値)、及び送電コイル11のインダクタンスの値(L値)が調整されている。信号源32とコンデンサ35で構成される送電部37は、送電コイル11を通じて受電装置41へ非接触で電力を伝送する(送電(給電))。
(1)
磁性体を有するコアと、
前記コアに線材が巻きつけられ、外部コイルと電磁的に結合して電力が伝送されるコイル部と、
前記コイル部の側面から一定の距離離れて配置された非磁性体と、
を備える、受電コイル。
(2)
前記非磁性体の厚さが、0.3mm以上である、前記(1)に記載の受電コイル。
(3)
前記磁性体を有するコアと前記コイル部を内蔵する樹脂部を、備え、
前記樹脂部の側面に前記非磁性体が配置されている、前記(1)又は(2)に記載の受電コイル。
(4)
前記コアの形状がH型である、前記(1)~(3)のいずれかに記載の受電コイル。
(5)
磁性体を有するコアと、
前記コアに線材が巻きつけられ、外部コイルと電磁的に結合して電力が伝送されるコイル部と、
前記コイル部の側面に対して一定の距離離れて配置された非磁性体と、
前記コイル部を介して交流信号を受信する受電部と、
を備える、受電装置。
(6)
交流信号を発生する送電装置と、該送電装置で発生した交流信号を受電する受電装置と、から構成され、
前記送電装置は、
線材が平面状に巻回された送電コイル部と、
前記送電コイル部に交流信号を供給する送電部と、
を備え、
前記受電装置は、
磁性体を有するコアと、
前記コアに線材が巻きつけられ、前記送電コイル部と電磁的に結合して電力が伝送される受電コイル部と、
前記受電コイル部の側面に対して一定の距離離れて配置された非磁性体と、
前記受電コイル部を介して交流信号を受信する受電部と、
を備える、非接触電力伝送システム。
(7)
前記送電コイル部の、前記受電コイル部側と反対面に配置された磁性シートを有する、前記(6)に記載の非接触電力伝送システム。
3,3A…樹脂部、3a…側面、4…空隙部、5…線材、6…非磁性体、11…送電コイ
ル、12…磁性シート、15…受電コイル、16…磁性シート、21,31…携帯電話端
末(電子機器)、31…送電装置、32…信号源、33…交流電源、34…抵抗素子、3
5…コンデンサ、15…送電コイル、37…送電部、41…受電装置、42…充電部、4
3…コンデンサ、44…抵抗素子、45…コンデンサ、47…受電部、48…整流部
Claims (7)
- 磁性体を有するコアと、
前記コアに線材が巻きつけられ、外部コイルと電磁的に結合して電力が伝送されるコイル部と、
前記コイル部の側面から一定の距離離れて配置された非磁性体と、
を備える、受電コイル。 - 前記非磁性体の厚さが、0.3mm以上である、請求項1に記載の受電コイル。
- 前記磁性体を有するコアと前記コイル部を内蔵する樹脂部を、備え、
前記樹脂部の側面に前記非磁性体が配置されている、請求項2に記載の受電コイル。 - 前記コアの形状がH型である、請求項3に記載の受電コイル。
- 磁性体を有するコアと、
前記コアに線材が巻きつけられ、外部コイルと電磁的に結合して電力が伝送されるコイル部と、
前記コイル部の側面に対して一定の距離離れて配置された非磁性体と、
前記コイル部を介して交流信号を受信する受電部と、
を備える、受電装置。 - 交流信号を発生する送電装置と、該送電装置で発生した交流信号を受電する受電装置と
、から構成され、
前記送電装置は、
線材が平面状に巻回された送電コイル部と、
前記送電コイル部に交流信号を供給する送電部と、
を備え、
前記受電装置は、
磁性体を有するコアと、
前記コアに線材が巻きつけられ、前記送電コイル部と電磁的に結合して電力が伝送される受電コイル部と、
前記受電コイル部の側面に対して一定の距離離れて配置された非磁性体と、
前記受電コイル部を介して交流信号を受信する受電部と、
を備える、非接触電力伝送システム。 - 前記送電コイル部の、前記受電コイル部側と反対面に配置された磁性シートを有する、請求項6に記載の非接触電力伝送システム。
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US14/007,563 US20140015338A1 (en) | 2011-03-31 | 2012-01-31 | Receiving coil, reception apparatus and non-contact power transmission system |
BR112013024411A BR112013024411A2 (pt) | 2011-03-31 | 2012-01-31 | bobina e aparelho de recepção, e, sistema de transmissão de energia sem contato |
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WO2013176151A1 (ja) * | 2012-05-21 | 2013-11-28 | 株式会社 テクノバ | 非接触給電トランス |
US9502176B2 (en) | 2012-05-21 | 2016-11-22 | Technova Inc. | Contactless power supply transfer transformer |
CN103825367A (zh) * | 2012-11-19 | 2014-05-28 | 株式会社东芝 | 无线电力传输装置 |
WO2014093061A1 (en) * | 2012-12-12 | 2014-06-19 | Oceaneering International Inc. | Wireless data transmission via inductive coupling using di/dt as the magnetic modulation scheme without hysteresis |
CN103312051A (zh) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | 一种利用铁磁谐振实现无线电能传输的系统及方法 |
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US20140015338A1 (en) | 2014-01-16 |
EP2693454A4 (en) | 2015-01-14 |
KR101941307B1 (ko) | 2019-01-22 |
CN103460314A (zh) | 2013-12-18 |
JP2012216687A (ja) | 2012-11-08 |
EP2693454A1 (en) | 2014-02-05 |
RU2013143155A (ru) | 2015-03-27 |
KR20140004169A (ko) | 2014-01-10 |
EP2693454B1 (en) | 2016-11-30 |
BR112013024411A2 (pt) | 2016-12-20 |
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