WO2013150785A1 - Coil unit, and power transmission device equipped with coil unit - Google Patents

Coil unit, and power transmission device equipped with coil unit Download PDF

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Publication number
WO2013150785A1
WO2013150785A1 PCT/JP2013/002294 JP2013002294W WO2013150785A1 WO 2013150785 A1 WO2013150785 A1 WO 2013150785A1 JP 2013002294 W JP2013002294 W JP 2013002294W WO 2013150785 A1 WO2013150785 A1 WO 2013150785A1
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WIPO (PCT)
Prior art keywords
coil
power transmission
power
coil unit
linear conductor
Prior art date
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PCT/JP2013/002294
Other languages
French (fr)
Japanese (ja)
Inventor
湯浅　安仁
太志 出口
立松　英樹
克也 岡本
江口　和弘
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パナソニック株式会社
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Publication of WO2013150785A1 publication Critical patent/WO2013150785A1/en

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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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2871—Pancake 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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • 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
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment

Definitions

  • the present invention relates to a coil unit and a power transmission device including the coil unit, for example, a coil unit and a power transmission device that transmit power in a non-contact manner by electromagnetic induction from a power transmission device to an electronic device or the like.
  • a wireless power transmission device electromagnetic induction between both coils between a primary-side power transmission coil provided on a power transmission device and a secondary-side power reception coil provided on an electronic device on the power reception side or the vehicle side.
  • a wireless power transmission device that performs power transmission using an action.
  • wireless power transmission there is no exposure of the contact part, so it is easy to ensure waterproofness, and there is no need to worry about defects or deterioration of the electrical contact part, and it is easy to attach and detach the power transmission device and power receiving device There are advantages such as being able to do.
  • the primary side power transmission coil and the secondary side power reception coil that are mounted on these electronic devices or the like are generally used that are wound around a core or wound around a bobbin.
  • portable electronic devices on the power receiving side are required to be downsized, thinned, and highly functional.
  • the wireless power transmission device includes a primary power transmission coil and a secondary power reception coil facing each other so that electromagnetic induction coupling can be made efficient.
  • a high frequency AC magnetic flux of 60 to 600 kHz is generated in the primary side power transmission coil.
  • the charging means 2 Power is supplied to the secondary battery.
  • Patent Document 1 describes a laminated coil unit used for at least one of a primary coil and a secondary coil for contactless power transmission.
  • the multilayer coil unit described in Patent Document 1 has N (N is an even number of 4 or more) planar air-core coils.
  • N planar air-core coils is composed of a spiral conductive pattern formed on an insulating substrate, and is laminated in the thickness direction of the insulating substrate.
  • (N / 2) sets of coil connection units in which two planar air-core coils out of N pieces are connected in a first connection form (for example, in parallel) which is one of parallel and series, It connects by the 2nd connection form (for example, series) which is the other of series.
  • the inductance L which is the coil characteristic, is increased, the resistance R is decreased, and the coil Q value is increased.
  • Patent Document 2 describes a planar coil configured by arranging flat conductor portions in a spiral shape.
  • the planar coil described in Patent Literature 2 is provided with a plurality of openings along the longitudinal direction of the conductor portion.
  • the electric device includes the planar coil and a load circuit that is driven based on a voltage induced in the planar coil by electromagnetic induction. Thereby, it becomes possible to reduce the thickness while reducing high-frequency loss.
  • Patent Document 3 describes a planar coil in which a plurality of conductive wires parallel to each other are arranged in a substantially planar shape and wound in a spiral shape.
  • the planar coil described in Patent Document 3 is connected in parallel by electrically connecting the ends of the conductive wires at the coil lead-out portion.
  • the conductive wires are arranged in a substantially planar manner in the planar coil, the coil thickness does not increase and the planar coil is thinned.
  • a plurality of conductive wires are connected in parallel, an increase in effective resistance due to the skin effect in the high frequency region is reduced.
  • the apparatus described in Patent Document 1 has a configuration in which each of N planar air-core coils formed of a spiral conductive pattern formed on an insulating substrate is stacked in the thickness direction of the insulating substrate. For this reason, the size of the planar air-core coil becomes a bottleneck and there is a problem in miniaturization of the apparatus. In addition, the apparatus described in Patent Document 1 has a small contribution to the suppression of the proximity effect in the coil unit, and is insufficient for improving the transmission efficiency by reducing the loss resistance.
  • the device described in Patent Document 2 has a configuration in which a plurality of openings are provided along the longitudinal direction of the conductor portion of the planar coil. Thereby, it can be said that thickness reduction is possible, reducing high frequency loss.
  • the structure in which a plurality of openings are provided along the longitudinal direction of the conductor portion of the coil has a problem in strength and the generation of the conductor tends to be complicated.
  • the object of the present invention is to suppress the proximity effect in the coil, suppress the loss resistance, suppress the decrease in power transmission efficiency, and even if there is a slight misalignment between the primary side and secondary side coils, It is an object of the present invention to provide a coil unit and a power transmission device including the coil unit, in which the power transmission efficiency is not greatly reduced.
  • a planar coil formed by winding the linear conductor in a spiral shape so that a predetermined linear gap is formed between the linear conductors, and the linear gap of the planar coil is maintained. And a support that supports in a leaned state.
  • a power transmission device is configured using the coil unit, and a power transmission coil in which a surface opposite to a surface facing the magnetic body of the planar coil is disposed on a power transmission side surface, and the power transmission coil And a power transmission unit that supplies power to the power source.
  • a power transmission device is configured using the coil unit, and a power receiving coil in which a surface opposite to a surface facing the magnetic body of the planar coil is disposed on a power receiving side surface, and the power receiving coil And a power receiving device that outputs the power received in step (1).
  • the present invention it is possible to suppress the loss resistance by suppressing the proximity effect in the coil.
  • it can be used for high-power wireless power transmission of about 10 W or more to suppress a decrease in power transmission efficiency.
  • FIG. Sectional drawing which shows the structure of the coil unit which concerns on Embodiment 1 of this invention.
  • FIG. Sectional drawing which shows the other structure of the linear conductor of the coil unit which concerns on the said Embodiment 1.
  • FIG. Sectional drawing which shows the structure of the other coil unit of the said Embodiment 1.
  • FIG. Sectional drawing which shows the structure which used the coil unit which concerns on the said Embodiment 1 as a primary side power transmission coil of a power transmission apparatus, and a secondary side power reception coil of an electronic device. Circuit diagram for measuring the power transmission efficiency of the coil unit according to the first embodiment.
  • FIG. 1 The figure which shows the resistance value characteristic of the coil unit which concerns on the said Embodiment 1.
  • FIG. 1 is a plan view of a coil unit according to Embodiment 1 of the present invention
  • FIG. 2 is a cross-sectional view taken along line AA ′ of FIG.
  • the coil unit 100 is a primary side power transmission coil or a secondary side power reception coil.
  • the coil unit 100 includes a planar spiral coil 111 formed by winding the linear conductor 110 into a spiral (spiral) planar curved line so that a predetermined line gap 115 is formed between the linear conductors 110.
  • the substrate 120 holding the planar spiral coil 111, the magnetic sheet 130 covering the surface opposite to the power transmission / reception surface of the linear conductor 110, the start terminal 140 connected to the start end 110a of the linear conductor 110, and the linear shape And a termination terminal 150 connected to the termination 110b of the conductor 110.
  • the plane spiral coil 111 is formed by winding the linear conductor 110.
  • the coil unit 100 only needs to have a structure having a gap between the linear conductors 110 of the planar spiral coil 111.
  • a predetermined line gap can be obtained only by winding it without a support.
  • the support (the substrate 120 and the magnetic sheet 130) in the present embodiment may have a structure having a gap between the lines of the linear conductor 110, and either the substrate 120 or the magnetic sheet 130 may be a wire. You may keep the gap.
  • the magnetic material sheet 130 is a magnetic material layer provided on the surface opposite to the power transmission / reception surface of the flat spiral coil 111, and suppresses unnecessary radiation due to the magnetic field generated by the linear conductor 110.
  • the magnetic sheet 130 is made of a magnetic material such as a silicon steel plate or an amorphous metal.
  • the configuration of the coil unit 100 will be described in more detail.
  • a high frequency current of several tens to several hundreds kHz is applied to the power transmission coil.
  • a high-frequency current is passed through a linear conductor 110 in which a single wire is wound to form a coil
  • the current distribution in the conductor cross section Becomes a shape biased toward the central axis, and the resistance value of the coil unit 100 increases and the so-called proximity effect that the loss increases tends to appear.
  • the coil unit 100 can provide the effect of suppressing the resistance loss by suppressing the proximity effect between the wires by providing a certain line gap 115 between the linear conductors 110, and between adjacent conductor patterns.
  • the interference of the magnetic flux at can be suppressed.
  • an increase in resistance value in the linear conductor 110 can be prevented, the Q value of transmission characteristics can be increased, and a propagation loss can be reduced.
  • the coil unit 100 is configured to satisfy the following relationship, where Wk is the maximum cross-sectional length of the linear conductor 110 forming the coil and Ws is the interval between adjacent linear conductors 110. Wk ⁇ 0.2 ⁇ Ws ⁇ Wk ⁇ 3.5
  • the interval Ws between the linear conductors 110 By setting the interval Ws between the linear conductors 110 to be not less than 0.2 times the maximum cross-sectional length Wk of the linear conductor 110 and not more than 3.5 times, the effect of suppressing the proximity effect, and the coil inductance It is possible to achieve both of the effects of suppressing the decrease in the amount. If it is shorter than 0.2 times, the proximity effect suppressing effect is weakened, and the loss resistance tends to increase. When it is larger than 3.5 times, the coil inductance is lowered and the Q value tends to be lowered. Preferably they are 0.2 times or more and 0.4 times or less, More preferably, they are 0.3 times or more and 0.4 times or less.
  • the coil unit 100 reduces the line density of the linear conductors 110 between the linear conductors 110 by reducing the gap between the linear conductors 110 to the outer peripheral part rather than the inner peripheral part. Is more dense.
  • a coil unit 100 is formed in a circular shape by winding a linear conductor 110, which is a coil wire, in a spiral shape from a start terminal 140 to a terminal 150. At this time, the winding was performed in a form in which a constant line gap 115 was held between the linear conductors 110 forming the coil unit 100.
  • the start terminal 140 and the termination terminal 150 are electrically connected to a power transmission circuit unit or a power reception circuit unit (not shown).
  • the magnetic flux generated from the coil unit 100 is directed in the Z-axis direction perpendicular to the paper surface.
  • the coil unit 100 is provided with a magnetic sheet 130 on a surface opposite to the direction of the power transmission / reception surface of the linear conductor 110.
  • the linear conductor 110 is composed of a single strand having a certain thickness, a rectangular shape, a plurality of thin strands arranged, or a litz wire bundled with a plurality of strands. It can be configured.
  • FIG. 3 shows a configuration using a rectangular linear conductor 110 such as a square as a preferable configuration.
  • the area that the conducting wire per unit cross-sectional area can occupy increases, and the effect of increasing the inductance of the coil unit 100 can be obtained.
  • 3 and 4 are cross-sectional views showing a configuration of a linear conductor of another coil unit according to the present embodiment.
  • the coil unit 100 ⁇ / b> A has a linear conductor 110 ⁇ / b> A made of a single strand having a rectangular shape such as a square.
  • the area that the conducting wire per unit cross-sectional area can occupy increases, and the effect of increasing the inductance of the coil unit 100A can be obtained. Moreover, the effect which prevents the resistance value increase in the linear conductor 110A is acquired.
  • the coil unit 100B has a litz wire linear conductor 110B in which a plurality of strands are bundled.
  • the Litz wire has a multilayer linear conductor configuration in which a plurality of strands having different twisting directions with respect to the core wire are bundled.
  • FIG. 5 is a cross-sectional view showing the configuration of another coil unit of the present embodiment.
  • the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.
  • the coil unit 100C is a primary power transmission coil or a secondary power reception coil.
  • the coil unit 100C is a planar spiral coil formed by winding the linear conductor 160 in a spiral shape so that the gap between the linear conductors 160 is narrower toward the outer periphery than the inner periphery.
  • 111 a substrate 120 that holds the planar spiral coil 111, a magnetic sheet 130 that covers the surface opposite to the power transmission / reception surface of the planar spiral coil 111, and a starting terminal (not shown) connected to the starting end of the linear conductor 160.
  • a termination terminal (not shown) connected to the termination of the linear conductor 160.
  • the coil unit 100C narrows the gap between the linear conductors 160 toward the outer peripheral part rather than the inner peripheral part (the inner peripheral part line gap 115 and the outer peripheral part line gap 116).
  • the line density is made denser in the outer peripheral part than in the inner peripheral part.
  • the line gap Wts at the outer peripheral portion of the linear conductor 160 is made denser (Wts ⁇ Ws) than the line gap Ws at the inner peripheral portion of the linear conductor 160.
  • the distance from the linear conductor 160 located on the innermost peripheral side of the coil unit 100C to the linear conductor 160 located on the outermost peripheral side of the coil unit 100C is Zt, and the gap between the linear conductors 160 is narrowed. If the distance between the innermost circumference and the linear conductor 160 located on the outermost circumference in the area is Zo, the outer circumference Zo with a narrow gap between the linear conductors 160 is the outermost part of the coil unit 100C.
  • the distance Zt from the linear conductor 160 located on the inner circumference to the linear conductor 160 located on the outermost circumference is preferably 0.1 times or more and 0.5 times or less.
  • the region is narrower than 0.1 times the distance Zt, it is difficult to obtain the effect of increasing the magnetic flux in the outer peripheral portion, and if it is wider than 0.5 times, the effect of suppressing the proximity effect tends to be difficult to obtain. is there.
  • they are 0.2 times or more and 0.4 times or less, More preferably, they are 0.3 times or more and 0.4 times or less.
  • the interval Wts between the linear conductors 160 in the outer peripheral region is the inner periphery. It is preferable that the interval Ws between the linear conductors 160 in the portion is 0.1 to 0.5 times. If the gap is shorter than 0.1 times, it is difficult to obtain the effect of suppressing the proximity effect, and if the gap is made longer than 0.5 times, it is difficult to obtain the effect of increasing the magnetic flux in the outer peripheral portion and not lowering the Q value of the coil. Tend to be. Preferably they are 0.1 times or more and 0.3 times or less, More preferably, they are 0.1 times or more and 0.2 times or less.
  • the coil unit 100C can be manufactured by the same manufacturing method.
  • a dry film resist is applied to the entire surface of the magnetic sheet 130, portions other than the wiring pattern are subjected to heat curing or ultraviolet curing, and non-parts are removed by etching treatment. Thereafter, a sandblast treatment with silica fine particles can be performed to provide a spiral groove having a width of about 0.1 to 1 mm.
  • the linear conductor 110 is inserted into the groove and fixed.
  • the coil unit 100 can be obtained by fixing the magnetic sheet 130 having a certain thickness and magnetic permeability on the surface opposite to the direction of power transmission by bonding or the like.
  • a nonmagnetic insulator (dielectric material or the like) having the shape is embedded in an unfired magnetic material, and the ferrite substrate is fired. Thereafter, the nonmagnetic insulator is removed by a process such as sandblasting (powder beam), laser, or etching.
  • the linear conductor 110 can be inserted and fixed in the removed concave spiral pattern.
  • a conductor layer made of Cu or the like is formed by performing processing such as plating, vapor deposition, and sputtering on the entire surface of the ferrite substrate.
  • the surface is polished so that the conductor remains only in the groove of the concave portion, and the portion other than the conductor of the groove portion is deleted to form a spiral conductor to obtain a coil portion.
  • an epoxy resin containing ferrite magnetic powder having a certain thickness and permeability on the surface opposite to the direction of power transmission is applied onto the coil by a screen printing method or the like, and thermally cured (for example, About 150 ° C.), an epoxy resin layer containing ferrite magnetic powder having a certain thickness can be formed on the coil.
  • the coil unit 100 is used as a primary power transmission coil of a power transmission device or a secondary power reception coil of an electronic device. The same applies when the coil unit 100C is used.
  • FIG. 6 is a cross-sectional view showing a configuration in which the coil unit 100 is used as a primary power transmission coil 210 of a power transmission device and a secondary power reception coil 220 of an electronic device.
  • the coil unit 100 includes a primary power transmission coil 210 that transmits power by electromagnetic induction, a secondary power reception coil 220 that receives power from the primary power transmission coil 210, and a primary side.
  • a power transmission device housing 230 that houses the power transmission coil 210 and an electronic device housing 240 that houses the secondary power receiving coil 220 are provided.
  • the primary-side power transmission coil 210 includes a planar spiral coil 111 formed by winding the linear conductor 110 in a spiral shape (spiral shape) such that a space between the linear conductors 110 becomes a predetermined line gap 115; A substrate 120 that holds the flat spiral coil 111 and a magnetic sheet 130A that covers a surface opposite to the power transmission surface of the plurality of coils are provided.
  • the secondary power receiving coil 220 is a flat spiral coil 111 formed by winding the linear conductor 110 in a spiral shape (spiral shape) so that a predetermined line gap 115 is formed between the lines of the linear conductor 110.
  • substrate 120 holding the plane spiral coil 111, and the magnetic material sheet 130B which covers the surface opposite to the electric power receiving surface of a some coil are provided.
  • the power transmission device housing 230 and the electronic device housing 240 are close to each other and electromagnetically coupled to each other, so that power can be transmitted wirelessly.
  • Example 10 Wireless power transmission was evaluated using the coil unit 100 shown in FIG.
  • the switching frequency was 150 kHz
  • the transmission distance between the primary side power transmission coil and the secondary side power reception coil was 40 mm
  • the transmission power from the power transmission device was 20 W.
  • FIG. 7 is a circuit diagram for measuring the power transmission efficiency of the coil unit 100.
  • the measurement circuit 250 includes a constant voltage power source 251, a power transmission circuit 252, and a primary power transmission coil 210 on the power transmission side, and a secondary power reception coil 220, a power reception circuit 253, and a load 254 on the power reception side.
  • the current (I 1 ) and voltage (V 1 ) supplied from the constant voltage source 251 by the constant voltage power supply 251 are sent to the primary power transmission coil 210 through the power transmission circuit 252. And the electric power transmission efficiency was measured from the voltage (V 2 ) applied to the voltage (V 2 ) applied to the current (I 2 ) and the load 254 through the power receiving circuit 253 for the voltage induced in the secondary side receiving coil 220 by electromagnetic induction.
  • a spiral pattern groove 120a was formed on an epoxy resin substrate 120, and the linear conductor 110 was laid in the groove 120a.
  • the linear conductor 110 a copper single wire having a diameter of 0.6 mm was used.
  • the maximum cross-sectional length Wk of the linear conductor 110 forming the coil and the interval Ws between adjacent linear conductors are shown in Table 1.
  • Table 1 shows the coil characteristics in Example 1-6 and Comparative Examples 1 and 2.
  • FIG. 8 is a diagram showing the resistance value characteristics of the coil of the coil unit 100.
  • the horizontal axis represents the ratio (Ws / Wk) of the distance Ws between adjacent linear conductors 110 to the maximum cross-sectional length Wk of the linear conductor 110 forming the coil, and the vertical axis represents the resistance value Re [ ⁇ ] of each coil. .
  • FIG. 9 is a diagram showing the Q value of the coil unit 100.
  • the horizontal axis represents Ws / Wk, and the vertical axis represents the Q value of each coil.
  • the Q value of the coil is a value influenced by the resistance and inductance of the coil.
  • Ws / Wk is small, the inductance value of the coil has a high value, but shows a small value due to the large coil resistance.
  • Ws / Wk increases, the Q value tends to increase due to a decrease in coil resistance. Further, when Ws / Wk is increased, a small value is shown due to the effect of reducing the coil inductance.
  • FIG. 10 is a diagram showing the transmission efficiency of the coil unit 100.
  • the horizontal axis represents Ws / Wk, and the vertical axis represents the transmission efficiency.
  • the coil transmission efficiency shows a tendency similar to the Q value of the coil. From these, when Ws / Wk is in the range of 0.2 to 3.5, it is possible to maintain a transmission efficiency of 65% or more which is practically at least satisfied.
  • a spiral pattern groove 120a was formed on an epoxy resin substrate 120, and a linear conductor 160 was laid in the groove 120a.
  • a copper single wire having a diameter of 0.6 mm was used as the linear conductor 12.
  • the gap in the outer peripheral portion is narrower than the inner peripheral portion of the coil, and the coil linear density is more in the outer peripheral portion than in the inner peripheral portion.
  • the coil configuration was provided with a dense portion.
  • the line gap Wts at the outer peripheral portion of the linear conductor 160 is made denser (Wts ⁇ Ws) than the line gap Ws at the inner peripheral portion of the linear conductor 160.
  • Table 2 shows the distances Zt and Zo, the ratios Zt / Zo, the line gaps Wts and Ws, and the ratios Wts / Ws of each example.
  • Zt [mm] is the distance from the linear conductor 160 located on the innermost circumferential side of the coil unit 100C to the linear conductor 160 located on the outermost circumferential side of the coil, and Zo [mm] is linear.
  • Wts [mm] in the area is the outer circumference where the gap between the linear conductors 160 is reduced.
  • the interval between the linear conductors 160 in the region is shown. The effect of Wts [mm] was observed with Zo and Zt kept constant.
  • FIG. 11 is a diagram showing the resistance value characteristics of the coil unit 100C.
  • the horizontal axis represents the ratio (Wts / Ws) of the interval Wts [mm] between the linear conductors 160 in the outer peripheral region where the gap of the linear conductor 160 is narrowed with respect to the interval Ws between the adjacent linear conductors 160 forming the coil.
  • the vertical axis represents the resistance value Re ( ⁇ ) of each coil.
  • FIG. 12 is a diagram showing the Q value of the coil unit 100C.
  • the horizontal axis represents Wts / Ws, and the vertical axis represents the Q value of each coil.
  • the Q value of the coil is a value that is influenced by the resistance and inductance of the coil.
  • Wts / Ws When Wts / Ws is small, the coil resistance is dominant and the value is slightly low.
  • Wts / Ws increases, the inductance value of the coil increases, and the Q value tends to increase as the coil resistance decreases. Further, when Wts / Ws increases, the coil inductance tends to decrease slightly due to the effect of decreasing coil inductance.
  • FIG. 13 is a diagram showing the transmission efficiency of the coil unit 100C.
  • the horizontal axis represents Wts / Ws, and the vertical axis represents the transmission efficiency.
  • the coil transmission efficiency shows a tendency similar to the Q value of the coil. From these, there is a tendency that even higher power transmission efficiency is maintained within a certain range of Wts / Ws of 0.1 to 0.5.
  • Table 3 shows the results of observing the effect of Zo [mm] while keeping Ws [mm] and Wk [mm] constant.
  • FIG. 14 is a diagram showing the resistance characteristic of the coil when Ws [mm] and Wk [mm] of the coil unit 100C are constant.
  • the horizontal axis represents the outer circumference with the gap between the linear conductors 160 narrowed with respect to the distance Zt [mm] from the linear conductor 160 located on the innermost circumference side of the coil unit 100C to the linear conductor 160 located on the outermost circumference side of the coil.
  • the ratio (Zo / Zt) of the distance Zo [mm] between the linear conductor 160 located in the innermost periphery and the outermost periphery in the region of the part is shown.
  • the vertical axis represents the resistance value Re [ ⁇ ] of each coil.
  • the coil resistance value tends to increase slightly as Zo / Zt increases, that is, as the area of the outer periphery where the gap between the linear conductors 160 is reduced.
  • FIG. 15 is a diagram showing a Q value when Ws [mm] and Wk [mm] of the coil unit 100C are constant.
  • the horizontal axis represents Zo / Zt, and the vertical axis represents the Q value of each coil.
  • the Q value of the coil increases and tends to decrease from a constant Zo / Zt.
  • the Q value of the coil is a value affected by the resistance and inductance of the coil.
  • Zo / Zt is small, it is dominant that the inductance is not slightly high, and shows a slightly low value.
  • Zo / Zt increases, the inductance value of the coil increases and the Q value tends to increase because the increase in coil resistance is suppressed.
  • Zo / Zt increases, the increase in coil resistance tends to decrease slightly due to the influence.
  • FIG. 16 is a diagram showing the transmission efficiency when the Ws [mm] and Wk [mm] of the coil unit 100C are constant.
  • the horizontal axis represents Zo / Zt
  • the vertical axis represents the transmission efficiency. The tendency which the Q value of the coil resembles is shown. From these, it is shown that Zo / Zt tends to maintain higher power transmission efficiency within a certain range of 0.1 to 0.5.
  • the coil unit 100 forms the linear conductor 110 in a spiral shape (spiral shape) so that a predetermined line gap 115 is formed between the lines of the linear conductor 110.
  • a flat spiral coil 111 formed by winding the flat spiral coil 111 and a substrate 120 that holds the flat spiral coil 111.
  • the coil unit 100C includes a planar spiral coil 111 formed by spirally winding the linear conductor 160 so that the gap between the linear conductors 160 is narrower toward the outer peripheral portion than the inner peripheral portion. And a substrate 120 that holds the planar spiral coil 111.
  • the gap between the outer peripheral portion and the inner peripheral portion of the coil is narrowed, and the linear density of the coil is closer to the outer peripheral portion than to the inner peripheral portion. Can increase the magnetic flux in the outer peripheral portion, which tends to be weak, and can compensate for a decrease in inductance.
  • the coil units 100 and 150 are used for high-power wireless power transmission, it is possible to suppress a decrease in power transmission efficiency, and long-distance power between the primary side and secondary side coils. Transmission is possible. Moreover, even if there is a slight misalignment between the primary side and secondary side coils, there is an excellent effect that the power transmission efficiency is not greatly reduced.
  • Embodiment 2 describes a wireless power transmission apparatus including coil units 100 and 150.
  • FIG. 17 and 18 are diagrams showing a configuration of a wireless power transmission device including the coil unit according to the second embodiment of the present invention.
  • FIG. 17 is a main configuration diagram of the electronic device and the power transmission device of the wireless power transmission device.
  • FIG. 18 is a control circuit diagram between the electronic device and the power transmission device of the wireless power transmission device. The same components as those in FIG. 6 are denoted by the same reference numerals.
  • the wireless power transmission device 300 includes a power transmission device 310 and an electronic device 320 that is a power reception device.
  • the power transmission device 310 and the electronic device 320 form a wireless power transmission device that wirelessly transmits power by electromagnetic induction coupling.
  • the power transmission device 310 is a charging device on which the electronic device 320 is placed and charges the secondary battery 321 of the electronic device 320.
  • the power transmission device 310 includes a primary power transmission coil 210, a power transmission control unit 312, and a power transmission circuit unit 313.
  • the primary side power transmission coil 210 is a wireless power transmission coil on the power transmission side when charging the secondary battery 321 of the electronic device 320.
  • the primary power transmission coil 210 uses the coil unit 100 of the first embodiment.
  • the power transmission control unit 312 supplies power to the primary power transmission coil 210 and controls it.
  • the electronic device 320 is a power receiving side electronic device.
  • the present invention is applied to an electronic device having a built-in secondary battery 321 for power storage as a load in the electronic device.
  • the electronic device 320 includes a circuit board including a secondary power receiving coil 220, a secondary battery 321, and a charge control circuit 322.
  • the secondary-side power receiving coil 220 is a power-receiving-side wireless power transmission coil that serves as a power-receiving side when the secondary battery 321 is charged, and uses the coil unit 100 of the first embodiment.
  • the secondary battery 321 generates operating power for the terminal.
  • the AC voltage of 100 [V], which is the commercial power supply 311, is converted into a predetermined DC voltage by an AC / DC converter (not shown), the DC voltage is generated as an AC voltage having a predetermined frequency, and the generated AC voltage To the power transmission circuit unit 313.
  • the generated AC voltage is supplied from the power transmission circuit unit 313 to the primary side power transmission coil 210, and causes the primary side power transmission coil 210 to oscillate at a predetermined resonance frequency.
  • an AC voltage is induced in the secondary power receiving coil 220 by the oscillation of the primary power transmitting coil 210 of the power transmitting device 310.
  • the induced AC voltage is rectified through a rectifier circuit (not shown), and the secondary battery 321 is charged with the DC voltage smoothed by the smoothing circuit.
  • the electronic device 320 serving as the power reception device transmits the power transmission device 310. It is detected that it is installed on the terminal mounting table.
  • the electronic device 320 is placed on the terminal mounting base of the power transmission device 310, and the secondary side power receiving coil 220 of the electronic device 320 and the primary side power transmission coil 210 of the power transmission device 310 are disposed close to each other. Due to this proximity arrangement, the load impedance changes, and the voltage or current value fluctuates in the primary side power transmission coil 210.
  • the power transmission control unit 312 detects the presence of the electronic device 320 to be charged by comparing the fluctuation value with a predetermined value.
  • the electronic device 320 on the power receiving side the electronic device 320 is placed on the terminal mounting base of the power transmission device 310, and the secondary power receiving coil 220 and the primary power transmission coil 210 are disposed in proximity to each other. A change in voltage or current value generated in the primary side power transmission coil 210 due to a change in load impedance is detected.
  • the charge control circuit 322 detects that the electronic device 320 is placed on the mounting table of the power transmission device 310 that is a charging device by comparing the fluctuation value with a predetermined value.
  • the electronic device 320 When the electronic device 320 is placed on the mounting table of the power transmission device 310, highly efficient power transmission is performed by placing the coils in an appropriate proximity. However, when the electronic device 320 is placed at an inappropriate position, the power transmission efficiency tends to decrease. For this reason, it is preferable to notify the user whether or not it is placed in an appropriate positional relationship by some method, and to prompt the user to place it in an appropriate position.
  • the wireless power transmission device 300 does not greatly reduce power transmission efficiency even if there is a slight misalignment between both coils. Transmission efficiency can be obtained.
  • the power transmission device 310 and the electronic device 320 can transmit information signals regarding both devices via the primary power transmission coil 210 and the secondary power reception coil 220. It is. For example, when the primary-side power transmission coil 210 and the secondary-side power reception coil 220 are arranged close to each other, the voltage fluctuation at that time is detected and an appropriate arrangement is detected, and the primary-side power transmission coil 210 and the secondary-side power reception coil are detected. The identification information of each device and apparatus is exchanged between the coils 220 to mutually authenticate each other.
  • the secondary side from the primary side power transmission coil 210 Power is transmitted to the side power receiving coil 220, and the secondary battery 321 of the electronic device 320 is charged with the transmitted power.
  • the power transmission device 310 includes a power transmission control unit 312, a power transmission circuit unit 313, and a primary side power transmission coil 210.
  • AC voltage supplied from the commercial power supply 311 is converted into a predetermined DC voltage through an AC / DC converter (not shown). This DC voltage is supplied to the power transmission circuit unit 313 via the power transmission control unit 312.
  • the power transmission circuit unit 313 has at least a driver and a resonance circuit (both not shown).
  • the driver converts the DC voltage from the AC / DC converter into an AC voltage having a predetermined frequency under the control of the power transmission control unit 312.
  • the resonance circuit resonates according to the AC voltage from the driver by a resonance circuit composed of a capacitor C and an inductance L of the coil. Thereby, the primary side power transmission coil 210 is oscillated at a predetermined resonance frequency.
  • the power transmission circuit unit 313 superimposes a modulation signal including information on the state of the device supplied from the power transmission control unit 312 and information on the AC signal for power transmission, or electronically only the information alone. Information transmission to the device 320 can also be performed.
  • the power transmission control unit 312 controls the driver of the power transmission circuit unit 313 and supplies an AC voltage of a predetermined frequency from the driver to the primary power transmission coil 210.
  • the power transmission control unit 312 detects voltage or current fluctuations generated in the primary power transmission coil 210 due to the close arrangement or movement of the electronic device 320 to the mounting table of the power transmission device 310. Then, based on the detection of the close arrangement and movement of the electronic device 320 to the mounting table of the power transmission device 310, the control of the supply and stop of the AC voltage from the driver to the primary power transmission coil 210 is performed.
  • the power transmission control unit 312 has a modulation / demodulation circuit (not shown) that transmits information on each device state between the power transmission device 310 and the electronic device 320.
  • Information is transmitted from the primary side power transmission coil 210 to the secondary side power reception coil 220 by generating and transmitting a signal modulated according to information on the state of the device.
  • the modulation signal transmitted from the electronic device 320 is extracted, the modulation signal is demodulated by the modulation / demodulation circuit, and the information transmitted from the electronic device 320 is received. Is called.
  • the electronic device 320 mainly includes a secondary power receiving coil 220, a power receiving circuit unit 323, a power receiving control unit 324, a charging control circuit 322, and a secondary battery 321.
  • the power receiving circuit unit 323 includes a rectifier circuit (not shown) that converts an alternating voltage induced in the secondary power receiving coil 220 by the electromagnetic induction from the primary power transmitting coil 210 into a direct current voltage, and a direct current sent from the rectifier circuit. It is comprised from the regulator (not shown) which converts a voltage into the predetermined voltage used by charge of the electronic device 320. FIG. In addition, a resonance circuit and a driver (both not shown) of the secondary power receiving coil 220 for sending device state information to the power transmission device 310 are provided.
  • the DC voltage converted into a predetermined voltage by the regulator is sent to the power reception control unit 324.
  • the power reception control unit 324 sends the power received by the power reception circuit unit 323 to the charge control circuit 322 and charges the secondary battery 321.
  • the power reception control unit 324 detects a device state of the electronic device 320, for example, a temperature rise, a charging state of the secondary battery 321, a voltage variation generated in the secondary power receiving coil 220, and the like.
  • the power reception control unit 324 includes a modulation / demodulation circuit (not shown) that sends a signal modulated according to the device information to the power transmission device 310 to the power reception circuit unit 323.
  • the driver When the oscillation circuit of the power reception circuit unit 323 transmits information from the electronic device 320 to the power transmission device 310, the driver causes the power reception control unit 324 to resonate the resonance circuit so that the secondary side reception coil 220 has a predetermined resonance frequency. Oscillate with.
  • the driver transmits a modulation signal for information transmission supplied from the power reception control unit 324.
  • Transmission / reception of information signals between the power transmission apparatus 310 and the electronic device 320 may be simple bit communication or coded communication.
  • the power transmission device 310 is used when the voltage value based on the change in the load impedance does not become a predetermined voltage value determined in advance or when the identification and authentication between the devices cannot be performed. It is controlled not to supply power to the primary side power transmission coil 210 as being in any abnormal state.
  • an AC voltage is induced in the secondary power receiving coil 220 by the electromagnetic induction coupling between the primary power transmitting coil 210 and the secondary power receiving coil 220, and is supplied to the power receiving circuit unit 323.
  • the secondary battery 321 of the electronic device 320 is being charged, the secondary battery 321 is interposed between the power transmission device 310 and the electric device 2 via the primary side power transmission coil 210 and the secondary side power reception coil 220.
  • the charging information is transmitted. For example, when the secondary battery 321 needs to be continuously charged, the power transmission from the primary power transmission coil 210 is continued. Further, when charging of the secondary battery 321 is completed, power transmission is stopped. Control is also performed to stop power transmission when information indicating some abnormality is supplied.
  • the coil unit may be applied to any electronic device such as a portable terminal. Any device may be used as long as the device transmits electric power in a non-contact manner by electromagnetic induction.
  • the device may be applied to a mobile terminal device such as a mobile phone.
  • the coil unit may be either a power transmission coil or a power reception coil.
  • the names of the coil unit and the power transmission device are used.
  • the coil unit is a planar coil, a power transmission coil or a power reception coil
  • the power transmission device is a wireless power transmission device.
  • a non-contact power transmission system or the like may be used.
  • each part constituting the coil unit for example, the type and shape of the linear conductor, the magnetic sheet, the mounting method, and the like are not limited to the above-described embodiment.
  • the linear conductor may be formed by being spirally wound, and the shape may be a circle or a polygon including a rectangle.
  • the coil unit and the power transmission device according to the present invention for example, attach or detachably attach an electronic device or the like as a power receiving object to a power transmission device such as a charging device, and contact the electronic device or the like from the power transmission device without electromagnetic contact.
  • the present invention can be applied to a coil unit for transmitting electric power and a power transmission device including the coil unit in general.
  • Coil unit 110 100, 100A, 100B, 100C Coil unit 110, 160 Linear conductor 111 Planar spiral coil 115 Line gap (inner peripheral line gap) 116 Outer peripheral line gap 120 Substrate 130 Magnetic sheet 140 Start terminal 150 End terminal 210 Primary side power transmission coil 220 Secondary side power reception coil 300 Wireless power transmission device 310 Power transmission device 312 Power transmission control unit 313 Power transmission circuit unit 320 Electronic device 321 2 Secondary battery 322 Charging control circuit 323 Power receiving circuit unit 324 Power receiving control unit

Abstract

Provided is a coil unit with which the proximity effect in the coil is suppressed, with which loss resistance and a reduction in power transmission efficiency are inhibited, and with which power transmission efficiency is not significantly reduced even if a slight positional displacement is present between the primary-side coil and the secondary-side coil. A coil unit (100) is provided with: a planar spirally wound coil (111) which is formed by winding a linear conductor (110) in a spiral shape such that the line between the linear conductor (110) is a prescribed line spacing (115); and a substrate (120) for holding the planar spirally wound coil (111). If the greatest cross-sectional length of the linear conductor (110) is Wk, and the spaces between the linear conductor (110) are Ws, then Wk x 0.2 ≤ Ws ≤ Wk x 3.5.

Description

コイルユニット及びコイルユニットを備える電力伝送装置Coil unit and power transmission device including coil unit
　本発明は、コイルユニット及びコイルユニットを備える電力伝送装置に関し、例えば送電装置から電子機器等に対して電磁誘導により非接触で電力を伝送するコイルユニット及び電力伝送装置に関する。 The present invention relates to a coil unit and a power transmission device including the coil unit, for example, a coil unit and a power transmission device that transmit power in a non-contact manner by electromagnetic induction from a power transmission device to an electronic device or the like.
　従来、ワイヤレス電力伝送装置として、送電装置に設けた１次側送電用コイルと、受電側である電子機器や車両側に設けた２次側受電用コイルとの間で、両コイル間の電磁誘導作用を利用して電力伝送を行うワイヤレス電力伝送装置がある。ワイヤレス電力伝送では接点部分の露出がないために防水性の確保が容易なことや、電気的接点部分の不良や劣化を気にしなくてもよく、電力送電装置と電力受電機器の着脱を容易に行うことができるなどの利点がある。 Conventionally, as a wireless power transmission device, electromagnetic induction between both coils between a primary-side power transmission coil provided on a power transmission device and a secondary-side power reception coil provided on an electronic device on the power reception side or the vehicle side There is a wireless power transmission device that performs power transmission using an action. In wireless power transmission, there is no exposure of the contact part, so it is easy to ensure waterproofness, and there is no need to worry about defects or deterioration of the electrical contact part, and it is easy to attach and detach the power transmission device and power receiving device There are advantages such as being able to do.
　これらの電子機器等に搭載されている１次側送電コイル及び２次側受電コイルは、コアに巻き線を巻いたものやボビンに巻き線を巻いたものが一般的に用いられている。近年、受電側の携帯電子機器に対して、小型化、薄型化、高機能化が要求されている。これらの要求に対して、送電装置及び受電側の電子機器に設ける送受電のコイルとして平面コイルを用いることが提案されている。 The primary side power transmission coil and the secondary side power reception coil that are mounted on these electronic devices or the like are generally used that are wound around a core or wound around a bobbin. In recent years, portable electronic devices on the power receiving side are required to be downsized, thinned, and highly functional. In response to these demands, it has been proposed to use a planar coil as a power transmission / reception coil provided in a power transmission device and a power receiving electronic device.
　上記ワイヤレス電力伝送装置は、１次側送電コイルと２次側受電コイルを電磁誘導結合が効率化できるように対向して備える。商用電源からの電圧を高周波インバータ回路により高周波交流電圧に変換して１次側送電コイルに加えることにより、この１次側送電コイルに６０～６００ｋＨｚの高周波の交流磁束が発生する。そして、電磁誘導作用により、受電側の電子機器内の２次側受電コイルにて該交流磁束により誘起された交流電圧が、２次側の整流平滑回路で直流に変換した後に充電手段である２次電池に給電される。 The wireless power transmission device includes a primary power transmission coil and a secondary power reception coil facing each other so that electromagnetic induction coupling can be made efficient. By converting the voltage from the commercial power source into a high frequency AC voltage by a high frequency inverter circuit and applying it to the primary side power transmission coil, a high frequency AC magnetic flux of 60 to 600 kHz is generated in the primary side power transmission coil. Then, after the AC voltage induced by the AC magnetic flux in the secondary power receiving coil in the power receiving side electronic device is converted into DC by the secondary side rectifying and smoothing circuit by the electromagnetic induction action, the charging means 2 Power is supplied to the secondary battery.
　特許文献１には、無接点電力伝送のための一次側コイル及び二次側コイルの少なくとも一方に用いられる積層コイルユニットが記載されている。特許文献１記載の積層コイルユニットは、Ｎ（Ｎは４以上の偶数）個の平面状空芯コイルを有する。Ｎ個の平面状空芯コイルの各々は、絶縁基板上に形成された渦巻状の導電パターンにて構成され、絶縁基板の厚さ方向にて積層される。そしてＮ個のうちの各２個の平面状空芯コイルを並列及び直列の一方である第１の接続形態（例えば並列）にて接続した（Ｎ／２）組のコイル接続ユニットが、並列及び直列の他方である第２の接続形態（例えば直列）にて接続する。これにより、コイル特性であるインダクタンスＬを大きく、抵抗Ｒを小さくして、コイルＱ値を大きくしようとする。 Patent Document 1 describes a laminated coil unit used for at least one of a primary coil and a secondary coil for contactless power transmission. The multilayer coil unit described in Patent Document 1 has N (N is an even number of 4 or more) planar air-core coils. Each of the N planar air-core coils is composed of a spiral conductive pattern formed on an insulating substrate, and is laminated in the thickness direction of the insulating substrate. Then, (N / 2) sets of coil connection units in which two planar air-core coils out of N pieces are connected in a first connection form (for example, in parallel) which is one of parallel and series, It connects by the 2nd connection form (for example, series) which is the other of series. As a result, the inductance L, which is the coil characteristic, is increased, the resistance R is decreased, and the coil Q value is increased.
　特許文献２には、平板状の導体部を渦巻き状に配置して構成した平面コイルが記載されている。特許文献２記載の平面コイルには、導体部の長手方向に沿って複数の開口部が設けられている。電気機器は、この平面コイルと、電磁誘導によってこの平面コイルに誘起される電圧に基づき駆動される負荷回路と、を備える。これにより、高周波損失を低減しつつ薄型化が可能となる。 Patent Document 2 describes a planar coil configured by arranging flat conductor portions in a spiral shape. The planar coil described in Patent Literature 2 is provided with a plurality of openings along the longitudinal direction of the conductor portion. The electric device includes the planar coil and a load circuit that is driven based on a voltage induced in the planar coil by electromagnetic induction. Thereby, it becomes possible to reduce the thickness while reducing high-frequency loss.
　特許文献３には、互いに並行な複数本の導電線が、略平面状に並べて渦巻き状に巻回された平面コイルが記載されている。特許文献３記載の平面コイルは、各導電線の端部同士がコイル引出し部で電気的に接続されることにより並列接続される。これにより、平面コイルは導電線が略平面状並べられるので、コイル厚が増加せず、薄型化される。また、複数本の導電線が並列接続されるので、高周波領域での表皮効果による実効抵抗の増大が低減される。 Patent Document 3 describes a planar coil in which a plurality of conductive wires parallel to each other are arranged in a substantially planar shape and wound in a spiral shape. The planar coil described in Patent Document 3 is connected in parallel by electrically connecting the ends of the conductive wires at the coil lead-out portion. As a result, since the conductive wires are arranged in a substantially planar manner in the planar coil, the coil thickness does not increase and the planar coil is thinned. In addition, since a plurality of conductive wires are connected in parallel, an increase in effective resistance due to the skin effect in the high frequency region is reduced.
特開２００８－２０５２１６号公報JP 2008-205216 A 特開２００９－２０６１６９号公報JP 2009-206169 A 特開２０１０－１６２３５号公報JP 2010-16235 A
　しかしながら、このような従来の記載の電力伝送装置にあっては、以下の課題があった。 However, such a conventional power transmission device has the following problems.
　特許文献１記載の装置は、絶縁基板上に形成された渦巻状の導電パターンからなるＮ個の平面状空芯コイルの各々が、絶縁基板の厚さ方向にて積層される構成である。このため、平面状空芯コイルの大きさがネックとなり装置の小型化に課題がある。また、特許文献１記載の装置では、コイルユニットでの近接効果の抑制に対する寄与は少なく、損失抵抗を少なくして電送効率を向上させることに対しては不十分である。 The apparatus described in Patent Document 1 has a configuration in which each of N planar air-core coils formed of a spiral conductive pattern formed on an insulating substrate is stacked in the thickness direction of the insulating substrate. For this reason, the size of the planar air-core coil becomes a bottleneck and there is a problem in miniaturization of the apparatus. In addition, the apparatus described in Patent Document 1 has a small contribution to the suppression of the proximity effect in the coil unit, and is insufficient for improving the transmission efficiency by reducing the loss resistance.
　特許文献２記載の装置は、平面コイルの導体部の長手方向に沿って複数の開口部を設ける構成である。これにより、高周波損失を低減しつつ薄型化が可能であるとされる。しかし、コイルの導体部の長手方向に沿って複数の開口部を設ける構造では、強度的に課題があり、またその導体の生成が複雑になる傾向にある。 The device described in Patent Document 2 has a configuration in which a plurality of openings are provided along the longitudinal direction of the conductor portion of the planar coil. Thereby, it can be said that thickness reduction is possible, reducing high frequency loss. However, the structure in which a plurality of openings are provided along the longitudinal direction of the conductor portion of the coil has a problem in strength and the generation of the conductor tends to be complicated.
　特許文献３記載の平面コイルは、互いに並行な複数本の導電線が、略平面状に並べて渦巻き状に巻回され、各導電線の端部同士がコイル引出し部で電気的に接続されることにより並列接続される構成である。しかし、この構成ではコイルが複雑な構成となり、また、近接効果低減に対する考慮がなされておらず、近接効果による損失抵抗の低減が不十分となる傾向にある。 In the planar coil described in Patent Document 3, a plurality of conductive wires parallel to each other are arranged in a substantially flat shape and wound in a spiral shape, and the ends of each conductive wire are electrically connected to each other at the coil lead-out portion. Are connected in parallel. However, in this configuration, the coil has a complicated configuration, and no consideration is given to reducing the proximity effect, and the loss resistance due to the proximity effect tends to be insufficient.
　本発明の目的は、コイルでの近接効果を抑制して、損失抵抗を抑えるとともに、電力伝送効率の低下を抑え、１次側・２次側コイル間の少々の位置ずれがあったとしても、電力伝送効率が大きく低下することがないコイルユニット及びコイルユニットを備える電力伝送装置を提供することである。 The object of the present invention is to suppress the proximity effect in the coil, suppress the loss resistance, suppress the decrease in power transmission efficiency, and even if there is a slight misalignment between the primary side and secondary side coils, It is an object of the present invention to provide a coil unit and a power transmission device including the coil unit, in which the power transmission efficiency is not greatly reduced.
　本発明に係るコイルユニットは、線状導体の線間が所定の線間隙となるように、前記線状導体をスパイラル状に巻回して形成された平面コイルと、前記平面コイルの線間隙が保たれた状態で支持する支持体と、を備える。 In the coil unit according to the present invention, a planar coil formed by winding the linear conductor in a spiral shape so that a predetermined linear gap is formed between the linear conductors, and the linear gap of the planar coil is maintained. And a support that supports in a leaned state.
　本発明に係る電力伝送装置は、上記コイルユニットを用いて構成され、前記平面コイルの磁性体との対向面とは反対側の面が送電側の面に配置された送電コイルと、該送電コイルに電力を供給する送電部と、を含む構成を採る。 A power transmission device according to the present invention is configured using the coil unit, and a power transmission coil in which a surface opposite to a surface facing the magnetic body of the planar coil is disposed on a power transmission side surface, and the power transmission coil And a power transmission unit that supplies power to the power source.
　本発明に係る電力伝送装置は、上記コイルユニットを用いて構成され、前記平面コイルの磁性体との対向面とは反対側の面が受電側の面に配置された受電コイルと、該受電コイルで受電された電力を出力する受電装置と、を含む構成を採る。 A power transmission device according to the present invention is configured using the coil unit, and a power receiving coil in which a surface opposite to a surface facing the magnetic body of the planar coil is disposed on a power receiving side surface, and the power receiving coil And a power receiving device that outputs the power received in step (1).
　本発明によれば、コイルでの近接効果を抑制して、損失抵抗を抑えることができる。例えば、約１０Ｗ以上の高出力のワイヤレス電力伝送に使用して、電力伝送効率の低下を抑えることができる。また、電力電送効率の低下を抑え、高効率での送電側・受電側コイル間での長距離の電力伝送を実現することができる。さらに、送電側・受電側コイル間の少々の位置ずれがあったとしても、電力電送効率が大きく低下することがない電力伝送装置を提供することができる。 According to the present invention, it is possible to suppress the loss resistance by suppressing the proximity effect in the coil. For example, it can be used for high-power wireless power transmission of about 10 W or more to suppress a decrease in power transmission efficiency. In addition, it is possible to suppress a decrease in power transmission efficiency and realize long-distance power transmission between the power transmission side and power reception side coils with high efficiency. Furthermore, even if there is a slight misalignment between the power transmission side and power reception side coils, it is possible to provide a power transmission device in which the power transmission efficiency is not greatly reduced.
本発明の実施の形態１に係るコイルユニットの構成を示す平面図The top view which shows the structure of the coil unit which concerns on Embodiment 1 of this invention. 図１のＡ－Ａ’矢視断面図A-A 'arrow cross-sectional view of FIG. 上記実施の形態１に係るコイルユニットの線状導体の他の構成を示す断面図Sectional drawing which shows the other structure of the linear conductor of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットの線状導体の他の構成を示す断面図Sectional drawing which shows the other structure of the linear conductor of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１の他のコイルユニットの構成を示す断面図Sectional drawing which shows the structure of the other coil unit of the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットを送電装置の１次側送電コイルと電子機器の２次側受電コイルとして用いた構成を示す断面図Sectional drawing which shows the structure which used the coil unit which concerns on the said Embodiment 1 as a primary side power transmission coil of a power transmission apparatus, and a secondary side power reception coil of an electronic device. 上記実施の形態１に係るコイルユニットの電力伝送効率を測定する回路図Circuit diagram for measuring the power transmission efficiency of the coil unit according to the first embodiment. 上記実施の形態１に係るコイルユニットの抵抗値特性を示す図The figure which shows the resistance value characteristic of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットのＱ値を示す図The figure which shows Q value of the coil unit which concerns on the said Embodiment 1. 上記実施の形態１に係るコイルユニットの電送効率を示す図The figure which shows the transmission efficiency of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットの抵抗値特性を示す図The figure which shows the resistance value characteristic of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットのＱ値を示す図The figure which shows Q value of the coil unit which concerns on the said Embodiment 1. 上記実施の形態１に係るコイルユニットの電送効率を示す図The figure which shows the transmission efficiency of the coil unit which concerns on the said Embodiment 1. FIG. 上記実施の形態１に係るコイルユニットのＷｓ、Ｗｋを一定とした場合のコイルの抵抗値特性を示す図The figure which shows the resistance value characteristic of a coil when Ws and Wk of the coil unit which concerns on the said Embodiment 1 are made constant. 上記実施の形態１に係るコイルユニットのＷｓ、Ｗｋを一定とした場合のＱ値を示す図The figure which shows Q value when Ws and Wk of the coil unit which concerns on the said Embodiment 1 are made constant. 上記実施の形態１に係るコイルユニットのＷｓ、Ｗｋを一定とした場合の電送効率を示す図The figure which shows the transmission efficiency when Ws and Wk of the coil unit which concerns on the said Embodiment 1 are made constant. 本発明の実施の形態２に係るコイルユニットを備えるワイヤレス電力伝送装置の電子機器と送電装置の主要構成図Main configuration diagram of electronic device and power transmission device of wireless power transmission device including coil unit according to embodiment 2 of the present invention 上記実施の形態２に係るコイルユニットを備えるワイヤレス電力伝送装置の電子機器と送電装置の間での制御回路図Control circuit diagram between an electronic device and a power transmission device of a wireless power transmission device including the coil unit according to the second embodiment
　以下、本発明の各実施の形態について図面を参照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　（実施の形態１）
　図１は、本発明の実施の形態１に係るコイルユニットの平面図、図２は図１のＡ－Ａ’矢視断面図である。以下、本発明に係るコイルユニットを、ワイヤレス電力伝送装置に適用される平面コイルで具現化した例で説明する。 (Embodiment 1)
1 is a plan view of a coil unit according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. Hereinafter, an example in which a coil unit according to the present invention is embodied by a planar coil applied to a wireless power transmission device will be described.
　図１及び図２に示すように、コイルユニット１００は、１次側送電コイル又は２次側受電コイルである。 As shown in FIGS. 1 and 2, the coil unit 100 is a primary side power transmission coil or a secondary side power reception coil.
　コイルユニット１００は、線状導体１１０の線間が所定の線間隙１１５となるように、線状導体１１０をスパイラル状（渦巻き状）の平面曲線状に巻回して形成された平面渦巻きコイル１１１と、平面渦巻きコイル１１１を保持する基板１２０と、線状導体１１０の送受電面と反対の面を覆う磁性体シート１３０と、線状導体１１０の始端１１０ａに接続された始端端子１４０と、線状導体１１０の終端１１０ｂに接続された終端端子１５０と、を備える。 The coil unit 100 includes a planar spiral coil 111 formed by winding the linear conductor 110 into a spiral (spiral) planar curved line so that a predetermined line gap 115 is formed between the linear conductors 110. The substrate 120 holding the planar spiral coil 111, the magnetic sheet 130 covering the surface opposite to the power transmission / reception surface of the linear conductor 110, the start terminal 140 connected to the start end 110a of the linear conductor 110, and the linear shape And a termination terminal 150 connected to the termination 110b of the conductor 110.
　ここで、平面渦巻きコイル１１１は、線状導体１１０が巻き回されて形成されたものである。コイルユニット１００は、平面渦巻きコイル１１１の線状導体１１０の線間に間隙を有する構造であればよい。例えば、コイルユニット１００は、線状導体１１０が被覆されたものであれば、支持体が無くても、それを巻くだけで所定の線間隙が得られる。この場合、支持体である基板１２０に溝を形成する必要はなくなる。また、本実施の形態における支持体（基板１２０及び磁性体シート１３０）は、線状導体１１０の線間に間隙を有する構造であればよく、基板１２０又は磁性体シート１３０のいずれか一方で線間を保持しても構わない。 Here, the plane spiral coil 111 is formed by winding the linear conductor 110. The coil unit 100 only needs to have a structure having a gap between the linear conductors 110 of the planar spiral coil 111. For example, as long as the coil unit 100 is covered with the linear conductor 110, a predetermined line gap can be obtained only by winding it without a support. In this case, it is not necessary to form a groove in the substrate 120 that is a support. Further, the support (the substrate 120 and the magnetic sheet 130) in the present embodiment may have a structure having a gap between the lines of the linear conductor 110, and either the substrate 120 or the magnetic sheet 130 may be a wire. You may keep the gap.
　磁性体シート１３０は、平面渦巻きコイル１１１の送受電面と反対の面に設けた磁性体層であり、線状導体１１０が発生する磁界による不要輻射を抑制する。磁性体シート１３０は、ケイ素鋼板、アモルファス金属などの磁性材料からなる。 The magnetic material sheet 130 is a magnetic material layer provided on the surface opposite to the power transmission / reception surface of the flat spiral coil 111, and suppresses unnecessary radiation due to the magnetic field generated by the linear conductor 110. The magnetic sheet 130 is made of a magnetic material such as a silicon steel plate or an amorphous metal.
　コイルユニット１００の構成についてより詳細に説明する。 The configuration of the coil unit 100 will be described in more detail.
　一般的に電力伝送コイルには、数十～数百ｋＨｚの高周波電流が印加される。１本の単線を巻回してコイルを形成した線状導体１１０に高周波電流を流す場合、近接する２本以上の線状導体１１０に平行して同じ向きの電流が流れると、導体断面の電流分布は中心軸側に偏った形となり、コイルユニット１００の抵抗値が増大し、損失が増大するといういわゆる近接効果が現れやすくなる傾向にある。 Generally, a high frequency current of several tens to several hundreds kHz is applied to the power transmission coil. When a high-frequency current is passed through a linear conductor 110 in which a single wire is wound to form a coil, if a current in the same direction flows parallel to two or more adjacent linear conductors 110, the current distribution in the conductor cross section Becomes a shape biased toward the central axis, and the resistance value of the coil unit 100 increases and the so-called proximity effect that the loss increases tends to appear.
　（１）コイルユニット１００は、線状導体１１０間に一定の線間隙１１５を設けることで、線間での近接効果を抑制して抵抗損失を抑える効果を得ることができ、隣り合う導線パターン間での磁束の干渉を抑制することができる。また、線状導体１１０での抵抗値増大を防ぐことができ、伝送特性のＱ値を上げることが可能となり、伝播損失の低減を図ることができる。 (1) The coil unit 100 can provide the effect of suppressing the resistance loss by suppressing the proximity effect between the wires by providing a certain line gap 115 between the linear conductors 110, and between adjacent conductor patterns. The interference of the magnetic flux at can be suppressed. In addition, an increase in resistance value in the linear conductor 110 can be prevented, the Q value of transmission characteristics can be increased, and a propagation loss can be reduced.
　（２）コイルユニット１００は、コイルを形成する線状導体１１０の断面最大長さをＷｋ、近接する線状導体１１０間の間隔をＷｓとした場合、以下の関係を満たす構成とする。
  Ｗｋ×０．２≦Ｗｓ≦Ｗｋ×３．５ (2) The coil unit 100 is configured to satisfy the following relationship, where Wk is the maximum cross-sectional length of the linear conductor 110 forming the coil and Ws is the interval between adjacent linear conductors 110.
Wk × 0.2 ≦ Ws ≦ Wk × 3.5
　線状導体１１０間の間隔Ｗｓを線状導体１１０の断面最大長さＷｋの０．２倍以上で、３．５倍以下とする構成とすることにより、近接効果を抑制する効果と、コイルインダクタンスの低下を抑える効果を両立させることができる。０．２倍よりも短くすると近接効果抑制効果が弱まり、損失抵抗が増加する傾向にある。３．５倍よりも大きくなると、コイルインダクタンスが低下して、Ｑ値を下げてしまう傾向にある。好ましくは０．２倍以上０．４倍以下、さらに好ましくは０．３倍以上０．４倍以下である。 By setting the interval Ws between the linear conductors 110 to be not less than 0.2 times the maximum cross-sectional length Wk of the linear conductor 110 and not more than 3.5 times, the effect of suppressing the proximity effect, and the coil inductance It is possible to achieve both of the effects of suppressing the decrease in the amount. If it is shorter than 0.2 times, the proximity effect suppressing effect is weakened, and the loss resistance tends to increase. When it is larger than 3.5 times, the coil inductance is lowered and the Q value tends to be lowered. Preferably they are 0.2 times or more and 0.4 times or less, More preferably, they are 0.3 times or more and 0.4 times or less.
　（３）コイルユニット１００は、線状導体１１０間の線間隙１１５を、内周部よりも外周部の方の間隙を狭めることで、線状導体１１０の線密度を内周部よりも外周部の方を密とする。 (3) The coil unit 100 reduces the line density of the linear conductors 110 between the linear conductors 110 by reducing the gap between the linear conductors 110 to the outer peripheral part rather than the inner peripheral part. Is more dense.
　これにより、磁束強度が弱くなりやすい外周部における磁束を強くすることができ、インダクタンスの低下を補えることができる。 This makes it possible to increase the magnetic flux in the outer peripheral portion where the magnetic flux intensity tends to be weak, and to compensate for the decrease in inductance.
　以下、本実施の形態のコイルユニット１００の具体的な構造について説明する。 Hereinafter, a specific structure of the coil unit 100 of the present embodiment will be described.
　図１に示すように、コイルの素線である線状導体１１０を始端端子１４０から終端端子１５０までスパイラル状に巻回して円形状にコイルユニット１００を形成した。このとき、コイルユニット１００を形成する線状導体１１０間に一定の線間隙１１５を保持した形で巻回した。 As shown in FIG. 1, a coil unit 100 is formed in a circular shape by winding a linear conductor 110, which is a coil wire, in a spiral shape from a start terminal 140 to a terminal 150. At this time, the winding was performed in a form in which a constant line gap 115 was held between the linear conductors 110 forming the coil unit 100.
　始端端子１４０及び終端端子１５０は、図示しない送電回路部又は受電回路部に電気的に接続される。コイルユニット１００から生成される磁束は、紙面に垂直なＺ軸方向に向かう。 The start terminal 140 and the termination terminal 150 are electrically connected to a power transmission circuit unit or a power reception circuit unit (not shown). The magnetic flux generated from the coil unit 100 is directed in the Z-axis direction perpendicular to the paper surface.
　また、コイルユニット１００は、線状導体１１０の送受電面の方向とは逆の面に磁性体シート１３０を設ける。 Further, the coil unit 100 is provided with a magnetic sheet 130 on a surface opposite to the direction of the power transmission / reception surface of the linear conductor 110.
　線状導体１１０は、一定の太さを有する素線１本から構成される場合や、矩形状のものや、細い素線を複数本並べたものや、複数の素線を束ねたリッツ線の構成とすることができる。 The linear conductor 110 is composed of a single strand having a certain thickness, a rectangular shape, a plurality of thin strands arranged, or a litz wire bundled with a plurality of strands. It can be configured.
　図３では、好ましい一つの構成として、正方形のような矩形状の線状導体１１０を使用した構成を示す。単位断面積当たりの導線の占めうる領域が多くなり、コイルユニット１００のインダクタンスを高める効果が得られる。 FIG. 3 shows a configuration using a rectangular linear conductor 110 such as a square as a preferable configuration. The area that the conducting wire per unit cross-sectional area can occupy increases, and the effect of increasing the inductance of the coil unit 100 can be obtained.
　図３及び図４は、本実施の形態の他のコイルユニットの線状導体の構成を示す断面図である。 3 and 4 are cross-sectional views showing a configuration of a linear conductor of another coil unit according to the present embodiment.
　図３に示すように、コイルユニット１００Ａは、正方形のような矩形状の１本の素線からなる線状導体１１０Ａを有する。単位断面積当たりの導線の占めうる領域が多くなり、コイルユニット１００Ａのインダクタンスを高める効果が得られる。また、線状導体１１０Ａでの抵抗値増大を防ぐ効果が得られる。 As shown in FIG. 3, the coil unit 100 </ b> A has a linear conductor 110 </ b> A made of a single strand having a rectangular shape such as a square. The area that the conducting wire per unit cross-sectional area can occupy increases, and the effect of increasing the inductance of the coil unit 100A can be obtained. Moreover, the effect which prevents the resistance value increase in the linear conductor 110A is acquired.
　また、図４に示すように、コイルユニット１００Ｂは、複数の素線を束ねたリッツ線の線状導体１１０Ｂを有する。細い素線を複数本束ねたリッツ線の構成とすることにより、表皮効果の低減を図ることができる。さらに、そのリッツ線として芯線に対して撚り巻回される方向を異ならせた複数の素線を束ねた多層線状導体の構成とすることも好ましい。この構成により、細い素線を複数本束ねたリッツ線において、各素線を流れる電流経路の方向がお互いずれることで、さらに近接効果を抑制することが可能になる。 Further, as shown in FIG. 4, the coil unit 100B has a litz wire linear conductor 110B in which a plurality of strands are bundled. By adopting a litz wire configuration in which a plurality of thin strands are bundled, the skin effect can be reduced. Furthermore, it is also preferable that the Litz wire has a multilayer linear conductor configuration in which a plurality of strands having different twisting directions with respect to the core wire are bundled. With this configuration, in the litz wire in which a plurality of thin strands are bundled, the directions of the current paths flowing through the strands are shifted from each other, thereby further suppressing the proximity effect.
　図５は、本実施の形態の他のコイルユニットの構成を示す断面図である。図１及び図２と同一構成部分には同一符号を付している。 FIG. 5 is a cross-sectional view showing the configuration of another coil unit of the present embodiment. The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.
　図５に示すように、コイルユニット１００Ｃは、１次側送電コイル又は２次側受電コイルである。 As shown in FIG. 5, the coil unit 100C is a primary power transmission coil or a secondary power reception coil.
　コイルユニット１００Ｃは、線状導体１６０の線間が内周部よりも外周部の方の間隙を狭めるように、線状導体１６０を螺旋状（スパイラル状）に巻回して形成された平面渦巻きコイル１１１と、平面渦巻きコイル１１１を保持する基板１２０と、平面渦巻きコイル１１１の送受電面と反対の面を覆う磁性体シート１３０と、線状導体１６０の始端に接続された始端端子（図示略）と、線状導体１６０の終端に接続された終端端子（図示略）と、を備える。 The coil unit 100C is a planar spiral coil formed by winding the linear conductor 160 in a spiral shape so that the gap between the linear conductors 160 is narrower toward the outer periphery than the inner periphery. 111, a substrate 120 that holds the planar spiral coil 111, a magnetic sheet 130 that covers the surface opposite to the power transmission / reception surface of the planar spiral coil 111, and a starting terminal (not shown) connected to the starting end of the linear conductor 160. And a termination terminal (not shown) connected to the termination of the linear conductor 160.
　コイルユニット１００Ｃは、線状導体１６０間の線間隙を、内周部よりも外周部の方の間隙を狭める（内周部線間隙１１５、外周部線間隙１１６）ことで、線状導体１６０の線密度を内周部よりも外周部の方を密とする。具体的には、線状導体１６０の外周部の線間隙Ｗｔｓは、線状導体１６０の内周部の線間隙Ｗｓより密（Ｗｔｓ＜Ｗｓ）とする。これにより、磁束強度が弱くなりやすい外周部における磁束を強くすることができ、電送効率の低下を補うことができる。 The coil unit 100C narrows the gap between the linear conductors 160 toward the outer peripheral part rather than the inner peripheral part (the inner peripheral part line gap 115 and the outer peripheral part line gap 116). The line density is made denser in the outer peripheral part than in the inner peripheral part. Specifically, the line gap Wts at the outer peripheral portion of the linear conductor 160 is made denser (Wts <Ws) than the line gap Ws at the inner peripheral portion of the linear conductor 160. Thereby, the magnetic flux in the outer peripheral part where the magnetic flux intensity tends to be weak can be strengthened, and the decrease in the transmission efficiency can be compensated.
　図５において、コイルユニット１００Ｃの最内周側に位置する線状導体１６０から、コイルユニット１００Ｃの最外周側に位置する線状導体１６０までの距離をＺｔ、線状導体１６０の間隙を狭めた外周部の領域において、その領域中の最内周と最外周に位置する線状導体１６０間の距離をＺｏとすると、線状導体１６０の間隙を狭めた外周部Ｚｏが、コイルユニット１００Ｃの最内周に位置する線状導体１６０から最外周に位置する線状導体１６０までの距離Ｚｔの０．１倍以上、０．５倍以下とすることが好ましい。前記距離Ｚｔの０．１倍よりも狭い領域であると外周部における磁束を強くする効果が得にくく、０．５倍よりも広い領域とすると、近接効果を抑制する効果が得にくくなる傾向にある。好ましくは０．２倍以上０．４倍以下、さらに好ましくは０．３倍以上０．４倍以下である。 In FIG. 5, the distance from the linear conductor 160 located on the innermost peripheral side of the coil unit 100C to the linear conductor 160 located on the outermost peripheral side of the coil unit 100C is Zt, and the gap between the linear conductors 160 is narrowed. If the distance between the innermost circumference and the linear conductor 160 located on the outermost circumference in the area is Zo, the outer circumference Zo with a narrow gap between the linear conductors 160 is the outermost part of the coil unit 100C. The distance Zt from the linear conductor 160 located on the inner circumference to the linear conductor 160 located on the outermost circumference is preferably 0.1 times or more and 0.5 times or less. If the region is narrower than 0.1 times the distance Zt, it is difficult to obtain the effect of increasing the magnetic flux in the outer peripheral portion, and if it is wider than 0.5 times, the effect of suppressing the proximity effect tends to be difficult to obtain. is there. Preferably they are 0.2 times or more and 0.4 times or less, More preferably, they are 0.3 times or more and 0.4 times or less.
　また、線状導体１６０の間隙を狭めた外周部の領域において、その領域中の線状導体１６０間の間隔をＷｔｓとすると、外周部の領域における線状導体１６０間の間隔Ｗｔｓは、内周部における線状導体１６０間の間隔Ｗｓの、０．１倍以上、０．５倍以下とすることが好ましい。０．１倍よりも間隙を短くすると近接効果を抑制する効果が得にくく、０．５倍よりも間隙を長くすると、外周部における磁束を高めて、コイルのＱ値を下げない効果が得にくくなる傾向になる。好ましくは０．１倍以上０．３倍以下、さらに好ましくは０．１倍以上０．２倍以下である。 Also, in the outer peripheral region where the gap between the linear conductors 160 is narrowed, if the interval between the linear conductors 160 in the region is Wts, the interval Wts between the linear conductors 160 in the outer peripheral region is the inner periphery. It is preferable that the interval Ws between the linear conductors 160 in the portion is 0.1 to 0.5 times. If the gap is shorter than 0.1 times, it is difficult to obtain the effect of suppressing the proximity effect, and if the gap is made longer than 0.5 times, it is difficult to obtain the effect of increasing the magnetic flux in the outer peripheral portion and not lowering the Q value of the coil. Tend to be. Preferably they are 0.1 times or more and 0.3 times or less, More preferably, they are 0.1 times or more and 0.2 times or less.
　次に、本実施の形態のコイルユニット１００の製造方法について説明する。なお、コイルユニット１００Ｃについても同様の製造方法により作製することができる。 Next, a method for manufacturing the coil unit 100 of the present embodiment will be described. The coil unit 100C can be manufactured by the same manufacturing method.
　まず、磁性体シート１３０全面にドライフィルムレジストを塗布し、配線パターン以外の部分を熱硬化又は紫外線硬化を施し、エッチング処理により、非箇所を除去する。その後、シリカ微粒子によるサンドブラスト処理することにより、幅０．１～１ｍｍ程度の螺旋状の溝を設けることができる。その溝に線状導体１１０を挿入し固定する。そして電力電送方向とは逆の面に一定の厚さと透磁率を持つ磁性体シート１３０を接着等で固定して、コイルユニット１００を得ることができる。 First, a dry film resist is applied to the entire surface of the magnetic sheet 130, portions other than the wiring pattern are subjected to heat curing or ultraviolet curing, and non-parts are removed by etching treatment. Thereafter, a sandblast treatment with silica fine particles can be performed to provide a spiral groove having a width of about 0.1 to 1 mm. The linear conductor 110 is inserted into the groove and fixed. The coil unit 100 can be obtained by fixing the magnetic sheet 130 having a certain thickness and magnetic permeability on the surface opposite to the direction of power transmission by bonding or the like.
　また、フェライト基板に一定の深さの凹部を形成するため、その形状の非磁性絶縁体（誘電体等）を未焼成の磁性材料に埋め込み、フェライト基板を焼成する。その後この非磁性絶縁体をサンドブラスト（パウダービーム）、レーザ、エッチング等の処理により除去する。除去された凹の螺旋状パターンに線状導体１１０を挿入し固定することができる。あるいは、線状導体１１０を挿入する代わりに、フェライト基板全表面に対して、めっき、蒸着、スパッタ等の処理を行うことによりＣｕ等の導体層を形成する。続いて、凹部の溝のみに導体が残るように表面を研磨して、溝部の導体以外を削除して螺旋状導体を形成してコイル部とする。その後、電力電送方向とは逆の面に一定の厚さと透磁率を持つフェライト磁性粉入りのエポキシ樹脂を、スクリーン印刷法等により磁性体シート１３０をコイル上に塗布して、熱硬化させ（例えば約１５０℃）、コイル上に一定の厚さのフェライト磁性粉入りエポキシ樹脂層を形成することができる。 Further, in order to form a concave portion having a certain depth in the ferrite substrate, a nonmagnetic insulator (dielectric material or the like) having the shape is embedded in an unfired magnetic material, and the ferrite substrate is fired. Thereafter, the nonmagnetic insulator is removed by a process such as sandblasting (powder beam), laser, or etching. The linear conductor 110 can be inserted and fixed in the removed concave spiral pattern. Alternatively, instead of inserting the linear conductor 110, a conductor layer made of Cu or the like is formed by performing processing such as plating, vapor deposition, and sputtering on the entire surface of the ferrite substrate. Subsequently, the surface is polished so that the conductor remains only in the groove of the concave portion, and the portion other than the conductor of the groove portion is deleted to form a spiral conductor to obtain a coil portion. After that, an epoxy resin containing ferrite magnetic powder having a certain thickness and permeability on the surface opposite to the direction of power transmission is applied onto the coil by a screen printing method or the like, and thermally cured (for example, About 150 ° C.), an epoxy resin layer containing ferrite magnetic powder having a certain thickness can be formed on the coil.
　次に、コイルユニット１００を、送電装置の１次側送電コイル、又は電子機器の２次側受電コイルとして用いる場合について説明する。なお、コイルユニット１００Ｃを用いる場合も同様である。 Next, the case where the coil unit 100 is used as a primary power transmission coil of a power transmission device or a secondary power reception coil of an electronic device will be described. The same applies when the coil unit 100C is used.
　図６は、コイルユニット１００を、送電装置の１次側送電コイル２１０と電子機器の２次側受電コイル２２０として用いた構成を示す断面図である。 FIG. 6 is a cross-sectional view showing a configuration in which the coil unit 100 is used as a primary power transmission coil 210 of a power transmission device and a secondary power reception coil 220 of an electronic device.
　図６に示すように、コイルユニット１００は、電磁誘導により電力を送電する１次側送電コイル２１０と、１次側送電コイル２１０からの電力を受電する２次側受電コイル２２０と、１次側送電コイル２１０を収容する送電装置のハウジング２３０と、２次側受電コイル２２０を収容する電子機器のハウジング２４０と、を備える。 As shown in FIG. 6, the coil unit 100 includes a primary power transmission coil 210 that transmits power by electromagnetic induction, a secondary power reception coil 220 that receives power from the primary power transmission coil 210, and a primary side. A power transmission device housing 230 that houses the power transmission coil 210 and an electronic device housing 240 that houses the secondary power receiving coil 220 are provided.
　１次側送電コイル２１０は、線状導体１１０の線間が所定の線間隙１１５となるように、線状導体１１０をスパイラル状（渦巻き状）に巻回して形成された平面渦巻きコイル１１１と、平面渦巻きコイル１１１を保持する基板１２０と、複数のコイルの電力電送面と逆の面を覆う磁性体シート１３０Ａと、を備える。 The primary-side power transmission coil 210 includes a planar spiral coil 111 formed by winding the linear conductor 110 in a spiral shape (spiral shape) such that a space between the linear conductors 110 becomes a predetermined line gap 115; A substrate 120 that holds the flat spiral coil 111 and a magnetic sheet 130A that covers a surface opposite to the power transmission surface of the plurality of coils are provided.
　２次側受電コイル２２０は、線状導体１１０の線間が所定の線間隙１１５となるように、線状導体１１０をスパイラル状（渦巻き状）に巻回して形成された平面渦巻きコイル１１１である線状導体１１０と、平面渦巻きコイル１１１を保持する基板１２０と、複数のコイルの電力受電面と逆の面を覆う磁性体シート１３０Ｂと、を備える。 The secondary power receiving coil 220 is a flat spiral coil 111 formed by winding the linear conductor 110 in a spiral shape (spiral shape) so that a predetermined line gap 115 is formed between the lines of the linear conductor 110. The linear conductor 110, the board | substrate 120 holding the plane spiral coil 111, and the magnetic material sheet 130B which covers the surface opposite to the electric power receiving surface of a some coil are provided.
　以上の構成において、送電装置のハウジング２３０と電子機器のハウジング２４０とが近接して電磁誘導結合することにより、ワイヤレスで電力伝送を行うことができる。 In the above configuration, the power transmission device housing 230 and the electronic device housing 240 are close to each other and electromagnetically coupled to each other, so that power can be transmitted wirelessly.
　以下、本発明に係るワイヤレス電力伝送についてより具体的な実施例を挙げて説明する。 Hereinafter, the wireless power transmission according to the present invention will be described with more specific examples.
　[実施例]
　図１に示すコイルユニット１００を使用してワイヤレス電力伝送を評価した。スイッチング周波数は１５０ｋＨｚ、１次側送電コイルと２次側受電コイルとの伝送距離は４０ｍｍ、送電装置からの送電電力は２０Ｗで行った。 [Example]
Wireless power transmission was evaluated using the coil unit 100 shown in FIG. The switching frequency was 150 kHz, the transmission distance between the primary side power transmission coil and the secondary side power reception coil was 40 mm, and the transmission power from the power transmission device was 20 W.
　図７は、コイルユニット１００の電力伝送効率を測定する回路図である。 FIG. 7 is a circuit diagram for measuring the power transmission efficiency of the coil unit 100.
　図７の測定回路２５０において、電力伝送効率（η＝Ｖ２×Ｉ２／Ｖ１×Ｉ１）を測定した。 In the measurement circuit 250 of FIG. 7, the power transmission efficiency (η = V 2 × I 2 / V 1 × I 1 ) was measured.
　測定回路２５０は、送電側が定電圧電源２５１、送電回路２５２及び１次側送電コイル２１０を備え、受電側が２次側受電コイル２２０、受電回路２５３、及び負荷２５４を備える。 The measurement circuit 250 includes a constant voltage power source 251, a power transmission circuit 252, and a primary power transmission coil 210 on the power transmission side, and a secondary power reception coil 220, a power reception circuit 253, and a load 254 on the power reception side.
　定電圧電源２５１により定電圧源供給される電流（Ｉ１）、電圧（Ｖ１）を、送電回路２５２を通じて１次側送電コイル２１０に送る。そして、電磁誘導により２次側受電コイル２２０に誘起された電圧を、受電回路２５３を通じて、電流（Ｉ２）、負荷２５４にかかる電圧（Ｖ２）から電力電送効率を測定した。 The current (I 1 ) and voltage (V 1 ) supplied from the constant voltage source 251 by the constant voltage power supply 251 are sent to the primary power transmission coil 210 through the power transmission circuit 252. And the electric power transmission efficiency was measured from the voltage (V 2 ) applied to the voltage (V 2 ) applied to the current (I 2 ) and the load 254 through the power receiving circuit 253 for the voltage induced in the secondary side receiving coil 220 by electromagnetic induction.
　図１及び図２に示すコイルユニット１００において、エポキシ樹脂の基板１２０上に螺旋状のパターンの溝１２０ａを形成し、その溝１２０ａに線状導体１１０を敷置した。線状導体１１０は、直径０．６ｍｍの銅単線を使用した。コイルを形成する線状導体１１０の断面最大長さＷｋ、近接する線状導体間の間隔Ｗｓは、表１に記載した。 In the coil unit 100 shown in FIGS. 1 and 2, a spiral pattern groove 120a was formed on an epoxy resin substrate 120, and the linear conductor 110 was laid in the groove 120a. As the linear conductor 110, a copper single wire having a diameter of 0.6 mm was used. The maximum cross-sectional length Wk of the linear conductor 110 forming the coil and the interval Ws between adjacent linear conductors are shown in Table 1.
　表１は、実施例１－６と比較例１，２におけるコイル特性を示す。
Figure JPOXMLDOC01-appb-T000001
 Table 1 shows the coil characteristics in Example 1-6 and Comparative Examples 1 and 2.
Figure JPOXMLDOC01-appb-T000001
　図８は、コイルユニット１００のコイルの抵抗値特性を示す図である。横軸はコイルを形成する線状導体１１０の断面最大長さＷｋに対する近接する線状導体１１０間の間隔Ｗｓの割合（Ｗｓ／Ｗｋ）、縦軸は各コイルの抵抗値Ｒｅ[Ω]を示す。 FIG. 8 is a diagram showing the resistance value characteristics of the coil of the coil unit 100. The horizontal axis represents the ratio (Ws / Wk) of the distance Ws between adjacent linear conductors 110 to the maximum cross-sectional length Wk of the linear conductor 110 forming the coil, and the vertical axis represents the resistance value Re [Ω] of each coil. .
　図８に示すように、Ｗｓ／Ｗｋの増加に伴い、つまり、線状導体の断面最大長さＷｋに対して、近接する線状導体間の間隔Ｗｓを大きくするに従い、コイルの抵抗値が減少する傾向にある。近接する線状導体間での近接効果の抑制の効果と考えられる。 As shown in FIG. 8, as the Ws / Wk increases, that is, the coil resistance value decreases as the interval Ws between adjacent linear conductors increases with respect to the cross-sectional maximum length Wk of the linear conductors. Tend to. This is considered to be an effect of suppressing the proximity effect between adjacent linear conductors.
　図９は、コイルユニット１００のＱ値を示す図である。横軸はＷｓ／Ｗｋ、縦軸は各コイルのＱ値を示す。 FIG. 9 is a diagram showing the Q value of the coil unit 100. The horizontal axis represents Ws / Wk, and the vertical axis represents the Q value of each coil.
　図９に示すように、Ｗｓ／Ｗｋの増加に伴い、コイルのＱ値は上昇し、一定のＷｓ／Ｗｋから減少する傾向にある。コイルのＱ値はコイルの抵抗とインダクタンスにより影響される値であり、Ｗｓ／Ｗｋが小さいときは、コイルのインダクタンス値は高い値を有するが、コイル抵抗が大きいことの影響で小さい値を示し、Ｗｓ／Ｗｋが大きくなると、コイル抵抗が減少することによりＱ値が増加する傾向にある。さらにＷｓ／Ｗｋが大きくなると、コイルインダクタンスが減少する影響で小さい値を示す。 As shown in FIG. 9, as the Ws / Wk increases, the Q value of the coil increases and tends to decrease from a constant Ws / Wk. The Q value of the coil is a value influenced by the resistance and inductance of the coil. When Ws / Wk is small, the inductance value of the coil has a high value, but shows a small value due to the large coil resistance. As Ws / Wk increases, the Q value tends to increase due to a decrease in coil resistance. Further, when Ws / Wk is increased, a small value is shown due to the effect of reducing the coil inductance.
　図１０は、コイルユニット１００の電送効率を示す図である。横軸はＷｓ／Ｗｋ、縦軸は電送効率を示す。 FIG. 10 is a diagram showing the transmission efficiency of the coil unit 100. The horizontal axis represents Ws / Wk, and the vertical axis represents the transmission efficiency.
　図１０に示すように、コイルの電送効率は、コイルのＱ値を似た傾向を示している。これらから、Ｗｓ／Ｗｋが０．２から３．５の範囲であれば、実用的に最低限満足される６５％以上の電送効率を保持することが可能となる。 As shown in FIG. 10, the coil transmission efficiency shows a tendency similar to the Q value of the coil. From these, when Ws / Wk is in the range of 0.2 to 3.5, it is possible to maintain a transmission efficiency of 65% or more which is practically at least satisfied.
　次に、コイルユニット１００Ｃを用いた場合のコイル特性について説明する。 Next, coil characteristics when the coil unit 100C is used will be described.
　図５に示すコイルユニット１００Ｃは、エポキシ樹脂の基板１２０上に螺旋状のパターンの溝１２０ａを形成し、その溝１２０ａに線状導体１６０を敷置した。線状導体１２は直径０．６ｍｍの銅単線を使用した。コイルを形成する線状導体１６０間に設ける一定の間隙において、コイルの内周部よりも外周部の方の間隙を狭めて、コイルの線密度が内周部の方よりも外周部の方が密とする部分を設けたコイル構成とした。線状導体１６０の外周部の線間隙Ｗｔｓは、線状導体１６０の内周部の線間隙Ｗｓより密（Ｗｔｓ＜Ｗｓ）とする。 In the coil unit 100C shown in FIG. 5, a spiral pattern groove 120a was formed on an epoxy resin substrate 120, and a linear conductor 160 was laid in the groove 120a. As the linear conductor 12, a copper single wire having a diameter of 0.6 mm was used. In a certain gap provided between the linear conductors 160 forming the coil, the gap in the outer peripheral portion is narrower than the inner peripheral portion of the coil, and the coil linear density is more in the outer peripheral portion than in the inner peripheral portion. The coil configuration was provided with a dense portion. The line gap Wts at the outer peripheral portion of the linear conductor 160 is made denser (Wts <Ws) than the line gap Ws at the inner peripheral portion of the linear conductor 160.
　表２は、各実施例の距離Ｚｔ、Ｚｏ、その割合Ｚｔ／Ｚｏ、線間隙Ｗｔｓ、Ｗｓ、その割合Ｗｔｓ／Ｗｓを示す。
Table 2 shows the distances Zt and Zo, the ratios Zt / Zo, the line gaps Wts and Ws, and the ratios Wts / Ws of each example.
　表２において、Ｚｔ[ｍｍ]は、コイルユニット１００Ｃの最内周側に位置する線状導体１６０からコイルの最外周側に位置する線状導体１６０までの距離、Ｚｏ[ｍｍ]は、線状導体１６０の間隙を狭めた外周部の領域において、その領域中の最内周と最外周に位置する線状導体１６０間の距離、Ｗｔｓ[ｍｍ]は線状導体１６０の間隙を狭めた外周部の領域において、その領域中の線状導体１６０間の間隔を示す。Ｚｏ、Ｚｔを一定にしてＷｔｓ[ｍｍ]の効果を観察した。 In Table 2, Zt [mm] is the distance from the linear conductor 160 located on the innermost circumferential side of the coil unit 100C to the linear conductor 160 located on the outermost circumferential side of the coil, and Zo [mm] is linear. In the outer peripheral area where the gap between the conductors 160 is narrowed, the distance between the innermost circumference and the linear conductor 160 located at the outermost circumference, Wts [mm], in the area is the outer circumference where the gap between the linear conductors 160 is reduced. In the region, the interval between the linear conductors 160 in the region is shown. The effect of Wts [mm] was observed with Zo and Zt kept constant.
　図１１は、コイルユニット１００Ｃの抵抗値特性を示す図である。横軸はコイルを形成する近接する線状導体１６０間の間隔Ｗｓに対する線状導体１６０の間隙を狭めた外周部の領域における線状導体１６０間の間隔Ｗｔｓ[ｍｍ]の割合（Ｗｔｓ／Ｗｓ）、縦軸は各コイルの抵抗値Ｒｅ(Ω)を示す。 FIG. 11 is a diagram showing the resistance value characteristics of the coil unit 100C. The horizontal axis represents the ratio (Wts / Ws) of the interval Wts [mm] between the linear conductors 160 in the outer peripheral region where the gap of the linear conductor 160 is narrowed with respect to the interval Ws between the adjacent linear conductors 160 forming the coil. The vertical axis represents the resistance value Re (Ω) of each coil.
　図１１に示すように、Ｗｔｓ／Ｗｓの増加に伴い、つまり、コイルを形成する近接する線状導体１６０間の間隔Ｗｓに対して、線状導体１６０の間隙を狭めた外周部の領域における線状導体１６０間の間隔Ｗｔｓを大きくするに従い、コイルの抵抗値がやや減少する傾向にある。 As shown in FIG. 11, as Wts / Ws increases, that is, the line in the outer peripheral region where the gap between the linear conductors 160 is narrower than the interval Ws between adjacent linear conductors 160 forming the coil. As the interval Wts between the conductors 160 increases, the coil resistance value tends to decrease slightly.
　図１２は、コイルユニット１００ＣのＱ値を示す図である。横軸はＷｔｓ／Ｗｓ、縦軸は各コイルのＱ値を示す。 FIG. 12 is a diagram showing the Q value of the coil unit 100C. The horizontal axis represents Wts / Ws, and the vertical axis represents the Q value of each coil.
　図１２に示すように、Ｗｔｓ／Ｗｓの増加に伴い、コイルのＱ値は上昇し、一定のＷｔｓ／Ｗｓから減少する傾向にある。コイルのＱ値は、コイルの抵抗とインダクタンスにより影響される値であり、Ｗｔｓ／Ｗｓが小さいときは、コイル抵抗が大きいことが支配的となり、やや低い値を示す。Ｗｔｓ／Ｗｓが増加するに伴い、コイルのインダクタンス値が高く、そしてコイル抵抗が減少することによりＱ値が増加する傾向にある。さらにＷｔｓ／Ｗｓが大きくなると、コイルインダクタンスが減少する影響でやや低下する傾向を示す。 As shown in FIG. 12, as the Wts / Ws increases, the Q value of the coil tends to increase and decrease from a constant Wts / Ws. The Q value of the coil is a value that is influenced by the resistance and inductance of the coil. When Wts / Ws is small, the coil resistance is dominant and the value is slightly low. As Wts / Ws increases, the inductance value of the coil increases, and the Q value tends to increase as the coil resistance decreases. Further, when Wts / Ws increases, the coil inductance tends to decrease slightly due to the effect of decreasing coil inductance.
　図１３は、コイルユニット１００Ｃの電送効率を示す図である。横軸はＷｔｓ／Ｗｓ、縦軸は電送効率を示す。 FIG. 13 is a diagram showing the transmission efficiency of the coil unit 100C. The horizontal axis represents Wts / Ws, and the vertical axis represents the transmission efficiency.
　図１３に示すように、コイルの電送効率は、コイルのＱ値を似た傾向を示している。これらから、Ｗｔｓ／Ｗｓが０．１～０．５の一定の範囲でさらに高い電送効率を保持する傾向を示している。 As shown in FIG. 13, the coil transmission efficiency shows a tendency similar to the Q value of the coil. From these, there is a tendency that even higher power transmission efficiency is maintained within a certain range of Wts / Ws of 0.1 to 0.5.
　次に、Ｗｓ[ｍｍ]、Ｗｋ[ｍｍ]を一定として、Ｚｏ[ｍｍ]の効果を観察した結果を表３に示す。
Figure JPOXMLDOC01-appb-T000003
 Next, Table 3 shows the results of observing the effect of Zo [mm] while keeping Ws [mm] and Wk [mm] constant.
Figure JPOXMLDOC01-appb-T000003
　図１４は、コイルユニット１００ＣのＷｓ[ｍｍ]、Ｗｋ[ｍｍ]を一定とした場合のコイルの抵抗値特性を示す図である。横軸はコイルユニット１００Ｃの最内周側に位置する線状導体１６０からコイルの最外周側に位置する線状導体１６０までの距離Ｚｔ[ｍｍ]に対する、線状導体１６０の間隙を狭めた外周部の領域における最内周と最外周に位置する線状導体１６０間の距離Ｚｏ[ｍｍ]の割合（Ｚｏ／Ｚｔ）を示す。縦軸は各コイルの抵抗値Ｒｅ[Ω]を示す。 FIG. 14 is a diagram showing the resistance characteristic of the coil when Ws [mm] and Wk [mm] of the coil unit 100C are constant. The horizontal axis represents the outer circumference with the gap between the linear conductors 160 narrowed with respect to the distance Zt [mm] from the linear conductor 160 located on the innermost circumference side of the coil unit 100C to the linear conductor 160 located on the outermost circumference side of the coil. The ratio (Zo / Zt) of the distance Zo [mm] between the linear conductor 160 located in the innermost periphery and the outermost periphery in the region of the part is shown. The vertical axis represents the resistance value Re [Ω] of each coil.
　図１４に示すように、Ｚｏ／Ｚｔの増加に伴い、つまり、線状導体１６０の間隙を狭めた外周部の領域が増加するに伴い、コイルの抵抗値がやや増加する傾向にある。 As shown in FIG. 14, the coil resistance value tends to increase slightly as Zo / Zt increases, that is, as the area of the outer periphery where the gap between the linear conductors 160 is reduced.
　図１５は、コイルユニット１００ＣのＷｓ[ｍｍ]、Ｗｋ[ｍｍ]を一定とした場合のＱ値を示す図である。横軸はＺｏ／Ｚｔ、縦軸は各コイルのＱ値を示す。 FIG. 15 is a diagram showing a Q value when Ws [mm] and Wk [mm] of the coil unit 100C are constant. The horizontal axis represents Zo / Zt, and the vertical axis represents the Q value of each coil.
　図１５に示すように、Ｚｏ／Ｚｔの増加に伴い、コイルのＱ値は上昇し、一定のＺｏ／Ｚｔから減少する傾向にある。コイルのＱ値は、コイルの抵抗とインダクタンスにより影響される値であり、Ｚｏ／Ｚｔが小さいときは、インダクタンスがやや高くなっていないことが支配的となり、やや低い値を示す。Ｚｏ／Ｚｔが増加するに伴い、コイルのインダクタンス値が増加し、そしてコイル抵抗の増加が抑えられていることからＱ値が増加する傾向にある。さらにＺｏ／Ｚｔが大きくなると、コイル抵抗の増加が支配的になる影響でやや低下する傾向を示す。 As shown in FIG. 15, as the Zo / Zt increases, the Q value of the coil increases and tends to decrease from a constant Zo / Zt. The Q value of the coil is a value affected by the resistance and inductance of the coil. When Zo / Zt is small, it is dominant that the inductance is not slightly high, and shows a slightly low value. As Zo / Zt increases, the inductance value of the coil increases and the Q value tends to increase because the increase in coil resistance is suppressed. Furthermore, when Zo / Zt increases, the increase in coil resistance tends to decrease slightly due to the influence.
　図１６は、コイルユニット１００ＣのＷｓ[ｍｍ]、Ｗｋ[ｍｍ]を一定とした場合の電送効率を示す図である。横軸はＺｏ／Ｚｔ、縦軸は電送効率を示す。コイルのＱ値を似た傾向を示している。これらから、Ｚｏ／Ｚｔが０．１～０．５の一定の範囲でさらに高い電送効率を保持する傾向を示している。 FIG. 16 is a diagram showing the transmission efficiency when the Ws [mm] and Wk [mm] of the coil unit 100C are constant. The horizontal axis represents Zo / Zt, and the vertical axis represents the transmission efficiency. The tendency which the Q value of the coil resembles is shown. From these, it is shown that Zo / Zt tends to maintain higher power transmission efficiency within a certain range of 0.1 to 0.5.
　以上詳細に説明したように、本実施の形態によれば、コイルユニット１００は、線状導体１１０の線間が所定の線間隙１１５となるように、線状導体１１０をスパイラル状（渦巻き状）に巻回して形成された平面渦巻きコイル１１１と、平面渦巻きコイル１１１を保持する基板１２０と、を備える。また、コイルユニット１００Ｃは、線状導体１６０の線間が内周部よりも外周部の方の間隙を狭めるように線状導体１６０を螺旋状に巻回して形成された平面渦巻きコイル１１１と、平面渦巻きコイル１１１を保持する基板１２０と、を備える。線状導体１１０の断面最大長さをＷｋ、線状導体１１０間の間隔をＷｓとした場合、Ｗｋ×０．２≦Ｗｓ≦Ｗｋ×３．５である。 As described above in detail, according to the present embodiment, the coil unit 100 forms the linear conductor 110 in a spiral shape (spiral shape) so that a predetermined line gap 115 is formed between the lines of the linear conductor 110. A flat spiral coil 111 formed by winding the flat spiral coil 111 and a substrate 120 that holds the flat spiral coil 111. The coil unit 100C includes a planar spiral coil 111 formed by spirally winding the linear conductor 160 so that the gap between the linear conductors 160 is narrower toward the outer peripheral portion than the inner peripheral portion. And a substrate 120 that holds the planar spiral coil 111. When the maximum cross-sectional length of the linear conductor 110 is Wk and the interval between the linear conductors 110 is Ws, Wk × 0.2 ≦ Ws ≦ Wk × 3.5.
　この構成により、以下の効果を得ることができる。 With this configuration, the following effects can be obtained.
　（１）近接する線状導体同士において、導体断面の電流分布は中心軸側に偏った形となり、コイルの抵抗値が増大しやすい傾向にある。そこで、コイルを構成する線状導体間に一定の間隙を設けることで線間での近接効果を抑制して抵抗損失を抑えることができる。間隙を設けることで放熱性に有利であり、構成的にも簡易で、部品材料の低減を図ることができる。 (1) Between adjacent linear conductors, the current distribution in the conductor cross section is biased toward the central axis, and the resistance value of the coil tends to increase. Therefore, by providing a certain gap between the linear conductors constituting the coil, the proximity effect between the lines can be suppressed and the resistance loss can be suppressed. Providing a gap is advantageous for heat dissipation, is simple in structure, and can reduce the material for components.
　（２）コイルユニット１００Ｃは、コイルの内周部よりも外周部の方の間隙を狭めて、コイルの線密度が内周部の方よりも外周部の方が密とすることにより、磁束強度が弱くなりやすい外周部における磁束を強くすることができ、インダクタンスの低下を補うことができる。 (2) In the coil unit 100C, the gap between the outer peripheral portion and the inner peripheral portion of the coil is narrowed, and the linear density of the coil is closer to the outer peripheral portion than to the inner peripheral portion. Can increase the magnetic flux in the outer peripheral portion, which tends to be weak, and can compensate for a decrease in inductance.
　以上のことから、コイルユニット１００、１５０は、高出力のワイヤレス電力伝送に使用しても、電力電送効率の低下を抑えることができ、１次側・２次側コイル間での長距離の電力伝送が可能となる。また、１次側・２次側コイル間に少しの位置ずれがあったとしても、電力電送効率が大きく低下することがないという優れた効果を奏する。 From the above, even if the coil units 100 and 150 are used for high-power wireless power transmission, it is possible to suppress a decrease in power transmission efficiency, and long-distance power between the primary side and secondary side coils. Transmission is possible. Moreover, even if there is a slight misalignment between the primary side and secondary side coils, there is an excellent effect that the power transmission efficiency is not greatly reduced.
　（実施の形態２）
　実施の形態１では、コイルユニット１００、１５０について説明した。 (Embodiment 2)
In the first embodiment, the coil units 100 and 150 have been described.
　実施の形態２は、コイルユニット１００、１５０を備えるワイヤレス電力伝送装置について説明する。 Embodiment 2 describes a wireless power transmission apparatus including coil units 100 and 150.
　図１７及び図１８は、本発明の実施の形態２のコイルユニットを備えるワイヤレス電力伝送装置の構成を示す図である。図１７は、上記ワイヤレス電力伝送装置の電子機器と送電装置の主要構成図である。図１８は、上記ワイヤレス電力伝送装置の電子機器と送電装置の間での制御回路図制御回路図である。図６と同一構成部分には同一符号を付している。 17 and 18 are diagrams showing a configuration of a wireless power transmission device including the coil unit according to the second embodiment of the present invention. FIG. 17 is a main configuration diagram of the electronic device and the power transmission device of the wireless power transmission device. FIG. 18 is a control circuit diagram between the electronic device and the power transmission device of the wireless power transmission device. The same components as those in FIG. 6 are denoted by the same reference numerals.
　図１７及び図１８に示すように、ワイヤレス電力伝送装置３００は、送電装置３１０と、受電装置である電子機器３２０と、を含んで構成される。 17 and 18, the wireless power transmission device 300 includes a power transmission device 310 and an electronic device 320 that is a power reception device.
　送電装置３１０と電子機器３２０とは、電磁誘導結合することにより、ワイヤレスで電力伝送を行うワイヤレス電力伝送装置を形成する。 The power transmission device 310 and the electronic device 320 form a wireless power transmission device that wirelessly transmits power by electromagnetic induction coupling.
　<送電装置３１０>
　送電装置３１０は、電子機器３２０が載置されて、電子機器３２０の２次電池３２１の充電を行う充電装置である。 <Power transmission device 310>
The power transmission device 310 is a charging device on which the electronic device 320 is placed and charges the secondary battery 321 of the electronic device 320.
　送電装置３１０は、１次側送電コイル２１０と、送電制御部３１２と、送電回路部３１３と、を備える。 The power transmission device 310 includes a primary power transmission coil 210, a power transmission control unit 312, and a power transmission circuit unit 313.
　１次側送電コイル２１０は、電子機器３２０の２次電池３２１の充電を行う際の送電側のワイヤレス電力伝送コイルである。１次側送電コイル２１０は、本実施例１のコイルユニット１００を用いる。 The primary side power transmission coil 210 is a wireless power transmission coil on the power transmission side when charging the secondary battery 321 of the electronic device 320. The primary power transmission coil 210 uses the coil unit 100 of the first embodiment.
　送電制御部３１２は、１次側送電コイル２１０へ電力供給とその制御を行う。 The power transmission control unit 312 supplies power to the primary power transmission coil 210 and controls it.
　<電子機器３２０>
　電子機器３２０は、受電側の電子機器である。ここでは、電子機器内の負荷として蓄電用の２次電池３２１を内蔵する電子機器に適用している。 <Electronic device 320>
The electronic device 320 is a power receiving side electronic device. Here, the present invention is applied to an electronic device having a built-in secondary battery 321 for power storage as a load in the electronic device.
　電子機器３２０は、２次側受電コイル２２０と、２次電池３２１と、充電制御回路３２２と、を含む回路基板を備える。 The electronic device 320 includes a circuit board including a secondary power receiving coil 220, a secondary battery 321, and a charge control circuit 322.
　２次側受電コイル２２０は、２次電池３２１の充電を行う際の受電側となる受電側のワイヤレス電力伝送コイルであり、本実施例１のコイルユニット１００を用いる。 The secondary-side power receiving coil 220 is a power-receiving-side wireless power transmission coil that serves as a power-receiving side when the secondary battery 321 is charged, and uses the coil unit 100 of the first embodiment.
　２次電池３２１は、端末の動作電力を発生する。 The secondary battery 321 generates operating power for the terminal.
　次に、ワイヤレス電力伝送装置３００の動作を説明する。 Next, the operation of the wireless power transmission device 300 will be described.
　電子機器３２０の２次側受電コイル２２０が、送電装置３１０の１次側送電コイル２１０に接近することで、両コイルの電磁誘導結合により２次側受電コイル２２０に交流電圧が誘起される。誘起された交流電圧は、受電回路部３２３に供給される。 When the secondary power reception coil 220 of the electronic device 320 approaches the primary power transmission coil 210 of the power transmission device 310, an AC voltage is induced in the secondary power reception coil 220 by electromagnetic induction coupling of both coils. The induced AC voltage is supplied to the power receiving circuit unit 323.
　商用電源３１１である１００[Ｖ]の交流電圧を、図示しないＡＣ／ＤＣコンバータにより所定の直流電圧に変換し、その直流電圧を所定の周波数の交流電圧を生成して、その生成された交流電圧を送電回路部３１３に送る。生成された交流電圧は、送電回路部３１３から１次側送電コイル２１０に供給され、１次側送電コイル２１０を所定の共振周波数で発振させる。共振コンデンサの容量は、電力伝送の信号の搬送波周波数Ｆ[Ｈｚ]と、コイルのインダクタンスから決定することができ、Ｆ＝１／２π√ＬＣ、で与えられる。 The AC voltage of 100 [V], which is the commercial power supply 311, is converted into a predetermined DC voltage by an AC / DC converter (not shown), the DC voltage is generated as an AC voltage having a predetermined frequency, and the generated AC voltage To the power transmission circuit unit 313. The generated AC voltage is supplied from the power transmission circuit unit 313 to the primary side power transmission coil 210, and causes the primary side power transmission coil 210 to oscillate at a predetermined resonance frequency. The capacity of the resonance capacitor can be determined from the carrier frequency F [Hz] of the power transmission signal and the inductance of the coil, and is given by F = 1 / 2π√LC.
　一方、電子機器３２０では、送電装置３１０の１次側送電コイル２１０の発振によって２次側受電コイル２２０に交流電圧が誘起される。誘起された交流電圧は、図示しない整流回路を通じて整流され、平滑回路にて平滑化した直流電圧により２次電池３２１の充電を行う。 On the other hand, in the electronic device 320, an AC voltage is induced in the secondary power receiving coil 220 by the oscillation of the primary power transmitting coil 210 of the power transmitting device 310. The induced AC voltage is rectified through a rectifier circuit (not shown), and the secondary battery 321 is charged with the DC voltage smoothed by the smoothing circuit.
　ここで、送電装置３１０の１次側送電コイル２１０の発振によって２次側受電コイル２２０に交流電圧が誘起され２次電池３２１の充電を行う前に、受電装置である電子機器３２０が送電装置３１０の端末載置台に設置されていることを検知する。 Here, before an AC voltage is induced in the secondary power receiving coil 220 by the oscillation of the primary power transmission coil 210 of the power transmission device 310 and the secondary battery 321 is charged, the electronic device 320 serving as the power reception device transmits the power transmission device 310. It is detected that it is installed on the terminal mounting table.
　まず、送電装置３１０の端末載置台に電子機器３２０が置かれ、電子機器３２０の２次側受電コイル２２０と送電装置３１０の１次側送電コイル２１０とが近接配置される。この近接配置により、負荷インピーダンスが変化して、１次側送電コイル２１０に電圧又は電流値の変動が生じる。送電制御部３１２は、上記変動値を予め定めておいた値と比較して、充電対象である電子機器３２０が存在することを検知する。 First, the electronic device 320 is placed on the terminal mounting base of the power transmission device 310, and the secondary side power receiving coil 220 of the electronic device 320 and the primary side power transmission coil 210 of the power transmission device 310 are disposed close to each other. Due to this proximity arrangement, the load impedance changes, and the voltage or current value fluctuates in the primary side power transmission coil 210. The power transmission control unit 312 detects the presence of the electronic device 320 to be charged by comparing the fluctuation value with a predetermined value.
　同様に、受電側である電子機器３２０でも、送電装置３１０の端末載置台に電子機器３２０が置かれて、２次側受電コイル２２０と１次側送電コイル２１０とが近接配置されることで、負荷インピーダンスが変化することにより１次側送電コイル２１０に生じた電圧又は電流値の変動を検知する。充電制御回路３２２は、上記変動値を予め定めておいた値と比較して、電子機器３２０が充電装置である送電装置３１０の載置台に置かれたことを検知する。 Similarly, in the electronic device 320 on the power receiving side, the electronic device 320 is placed on the terminal mounting base of the power transmission device 310, and the secondary power receiving coil 220 and the primary power transmission coil 210 are disposed in proximity to each other. A change in voltage or current value generated in the primary side power transmission coil 210 due to a change in load impedance is detected. The charge control circuit 322 detects that the electronic device 320 is placed on the mounting table of the power transmission device 310 that is a charging device by comparing the fluctuation value with a predetermined value.
　電子機器３２０が、送電装置３１０の載置台に置かれる際、コイル同士が適切な近接配置に置かれることにより高効率の電力伝送がなされる。しかし、電子機器３２０が不適切な位置に置かれると、電力電送効率は低下する傾向にある。そのため、適切な位置関係に置かれているかどうかをユーザに何らかの方法で通知し、適切な位置に置くように促すことが好ましい。 When the electronic device 320 is placed on the mounting table of the power transmission device 310, highly efficient power transmission is performed by placing the coils in an appropriate proximity. However, when the electronic device 320 is placed at an inappropriate position, the power transmission efficiency tends to decrease. For this reason, it is preferable to notify the user whether or not it is placed in an appropriate positional relationship by some method, and to prompt the user to place it in an appropriate position.
　本実施の形態のワイヤレス電力伝送装置３００は、両コイル間の少々の位置ずれがあったとしても、電力電送効率が大きく低下することがないため、比較的ラフな位置決めであっても一定の電力電送効率が得られる。 The wireless power transmission device 300 according to the present embodiment does not greatly reduce power transmission efficiency even if there is a slight misalignment between both coils. Transmission efficiency can be obtained.
　また、本実施の形態のワイヤレス電力伝送装置３００は、送電装置３１０と電子機器３２０とは、１次側送電コイル２１０と２次側受電コイル２２０を介して双方の機器に関する情報信号の伝達が可能である。例えば、１次側送電コイル２１０と２次側受電コイル２２０とが近接配置され、そのときの電圧変動を検出して、適切な配置を検知した場合、１次側送電コイル２１０及び２次側受電コイル２２０間で各々の機器及び装置の識別情報をやりとりして、互いに相手方の認証を行う。そして、１次側送電コイル２１０と２次側受電コイル２２０とが適切な近接配置された検知し、各々の機器及び装置が互いに相手方を認証できた場合に、１次側送電コイル２１０から２次側受電コイル２２０に電力伝送が行われ、その伝送された電力により電子機器３２０の２次電池３２１の充電が行われる。 In addition, in the wireless power transmission device 300 according to the present embodiment, the power transmission device 310 and the electronic device 320 can transmit information signals regarding both devices via the primary power transmission coil 210 and the secondary power reception coil 220. It is. For example, when the primary-side power transmission coil 210 and the secondary-side power reception coil 220 are arranged close to each other, the voltage fluctuation at that time is detected and an appropriate arrangement is detected, and the primary-side power transmission coil 210 and the secondary-side power reception coil are detected. The identification information of each device and apparatus is exchanged between the coils 220 to mutually authenticate each other. When the primary side power transmission coil 210 and the secondary side power reception coil 220 are detected to be appropriately arranged close to each other and the respective devices and devices can authenticate each other, the secondary side from the primary side power transmission coil 210 Power is transmitted to the side power receiving coil 220, and the secondary battery 321 of the electronic device 320 is charged with the transmitted power.
　次に、送電装置３１０と電子機器３２０間でのワイヤレス電力伝送の制御について説明する。 Next, control of wireless power transmission between the power transmission device 310 and the electronic device 320 will be described.
　図１８に示すように、送電装置３１０は、送電制御部３１２、送電回路部３１３、及び１次側送電コイル２１０を備える。 As illustrated in FIG. 18, the power transmission device 310 includes a power transmission control unit 312, a power transmission circuit unit 313, and a primary side power transmission coil 210.
　商用電源３１１から供給される交流電圧は、図示しないＡＣ／ＤＣコンバータを通じて所定の直流電圧に変換される。この直流電圧は、送電制御部３１２を介して送電回路部３１３へ供給される。 AC voltage supplied from the commercial power supply 311 is converted into a predetermined DC voltage through an AC / DC converter (not shown). This DC voltage is supplied to the power transmission circuit unit 313 via the power transmission control unit 312.
　送電回路部３１３は、少なくともドライバ及び共振回路（いずれも図示略）を有している。ドライバは、送電制御部３１２による制御によって、ＡＣ／ＤＣコンバータからの直流電圧を所定の周波数を有する交流電圧に変換する。共振回路は、コンデンサの容量ＣとコイルのインダクタンスＬからなる共振回路により、ドライバからの交流電圧に応じて共振する。これにより、１次側送電コイル２１０を所定の共振周波数で発振させる。 The power transmission circuit unit 313 has at least a driver and a resonance circuit (both not shown). The driver converts the DC voltage from the AC / DC converter into an AC voltage having a predetermined frequency under the control of the power transmission control unit 312. The resonance circuit resonates according to the AC voltage from the driver by a resonance circuit composed of a capacitor C and an inductance L of the coil. Thereby, the primary side power transmission coil 210 is oscillated at a predetermined resonance frequency.
　また、送電回路部３１３は、送電制御部３１２から供給される装置の状態や認証のための情報を含んだ変調信号を電力伝送用の交流信号に重畳するか又は、その情報のみを単独で電子機器３２０への情報送信も行うことが可能である。 In addition, the power transmission circuit unit 313 superimposes a modulation signal including information on the state of the device supplied from the power transmission control unit 312 and information on the AC signal for power transmission, or electronically only the information alone. Information transmission to the device 320 can also be performed.
　送電制御部３１２は、送電装置３１０から電子機器３２０へ充電電力を伝送する場合には、送電回路部３１３のドライバを制御し、ドライバから１次側送電コイル２１０へ所定の周波数の交流電圧を供給させる。また、送電制御部３１２は、送電装置３１０の載置台へ電子機器３２０の接近配置や移動により１次側送電コイル２１０に発生する電圧又は電流変動を検知する。そして、送電装置３１０の載置台へ電子機器３２０の接近配置や移動の検知に基づいて、ドライバから１次側送電コイル２１０への交流電圧の供給と停止の制御などを行う。さらに、送電制御部３１２は、送電装置３１０と電子機器３２０間での各々の機器状態の情報を送信する変復調回路（図示略）を有している。機器の状態の情報に応じて変調した信号を生成して送信を行うことにより、１次側送電コイル２１０から、２次側受電コイル２２０へ情報送信が行われる。 When transmitting charging power from the power transmission device 310 to the electronic device 320, the power transmission control unit 312 controls the driver of the power transmission circuit unit 313 and supplies an AC voltage of a predetermined frequency from the driver to the primary power transmission coil 210. Let In addition, the power transmission control unit 312 detects voltage or current fluctuations generated in the primary power transmission coil 210 due to the close arrangement or movement of the electronic device 320 to the mounting table of the power transmission device 310. Then, based on the detection of the close arrangement and movement of the electronic device 320 to the mounting table of the power transmission device 310, the control of the supply and stop of the AC voltage from the driver to the primary power transmission coil 210 is performed. Furthermore, the power transmission control unit 312 has a modulation / demodulation circuit (not shown) that transmits information on each device state between the power transmission device 310 and the electronic device 320. Information is transmitted from the primary side power transmission coil 210 to the secondary side power reception coil 220 by generating and transmitting a signal modulated according to information on the state of the device.
　逆に、電子機器３２０から機器情報の受信を行う場合、電子機器３２０から送られてきた変調信号を取り出し、変復調回路で変調信号の復調が行われ、電子機器３２０から送られる情報の受信が行われる。 Conversely, when device information is received from the electronic device 320, the modulation signal transmitted from the electronic device 320 is extracted, the modulation signal is demodulated by the modulation / demodulation circuit, and the information transmitted from the electronic device 320 is received. Is called.
　一方、電子機器３２０は、２次側受電コイル２２０、受電回路部３２３、受電制御部３２４、充電制御回路３２２、及び２次電池３２１を、主に備える。 Meanwhile, the electronic device 320 mainly includes a secondary power receiving coil 220, a power receiving circuit unit 323, a power receiving control unit 324, a charging control circuit 322, and a secondary battery 321.
　受電回路部３２３は、１次側送電コイル２１０からの電磁誘導により２次側受電コイル２２０に誘起された交流電圧を直流電圧に変換する整流回路（図示略）と、整流回路から送られた直流電圧を電子機器３２０の充電で使用される所定電圧に変換するレギュレータ（図示略）から構成される。また送電装置３１０へ機器状態の情報を送るための２次側受電コイル２２０の共振回路とドライバ（いずれも図示略）を備えている。 The power receiving circuit unit 323 includes a rectifier circuit (not shown) that converts an alternating voltage induced in the secondary power receiving coil 220 by the electromagnetic induction from the primary power transmitting coil 210 into a direct current voltage, and a direct current sent from the rectifier circuit. It is comprised from the regulator (not shown) which converts a voltage into the predetermined voltage used by charge of the electronic device 320. FIG. In addition, a resonance circuit and a driver (both not shown) of the secondary power receiving coil 220 for sending device state information to the power transmission device 310 are provided.
　レギュレータにより、所定電圧に変換された直流電圧は、受電制御部３２４に送られる。受電制御部３２４は、受電回路部３２３が受電した電力を、充電制御回路３２２へ送り、２次電池３２１の充電を行う。また、受電制御部３２４は、電子機器３２０の機器状態、例えば温度上昇、２次電池３２１の充電状態、２次側受電コイル２２０に発生する電圧変動等を検出する。さらに、受電制御部３２４は、送電装置３１０へ機器情報に応じた変調した信号を受電回路部３２３へ送る変復調回路（図示略）を備える。 The DC voltage converted into a predetermined voltage by the regulator is sent to the power reception control unit 324. The power reception control unit 324 sends the power received by the power reception circuit unit 323 to the charge control circuit 322 and charges the secondary battery 321. In addition, the power reception control unit 324 detects a device state of the electronic device 320, for example, a temperature rise, a charging state of the secondary battery 321, a voltage variation generated in the secondary power receiving coil 220, and the like. Furthermore, the power reception control unit 324 includes a modulation / demodulation circuit (not shown) that sends a signal modulated according to the device information to the power transmission device 310 to the power reception circuit unit 323.
　受電回路部３２３の発振回路は、電子機器３２０から送電装置３１０へ情報伝送を行う際、ドライバは受電制御部３２４により、共振回路を共振させることにより、２次側受電コイル２２０を所定の共振周波数で発振させる。ドライバは、受電制御部３２４から供給される情報送信用の変調信号を送信する。 When the oscillation circuit of the power reception circuit unit 323 transmits information from the electronic device 320 to the power transmission device 310, the driver causes the power reception control unit 324 to resonate the resonance circuit so that the secondary side reception coil 220 has a predetermined resonance frequency. Oscillate with. The driver transmits a modulation signal for information transmission supplied from the power reception control unit 324.
　送電装置３１０と電子機器３２０間での情報信号の送受信は、単純なビット通信でもあってもよいし、コード化通信であってもよい。 Transmission / reception of information signals between the power transmission apparatus 310 and the electronic device 320 may be simple bit communication or coded communication.
　また、本実施の形態では、送電装置３１０は、負荷インピーダンスの変化に基づく電圧値が予め定めた所定の電圧値にならなかった時や、相互の機器間での識別認証ができなかった時は何らかの異常な状態にあるものとして、１次側送電コイル２１０への電力供給を行わないように制御される。 Further, in the present embodiment, the power transmission device 310 is used when the voltage value based on the change in the load impedance does not become a predetermined voltage value determined in advance or when the identification and authentication between the devices cannot be performed. It is controlled not to supply power to the primary side power transmission coil 210 as being in any abnormal state.
　また、本実施の形態では、１次側送電コイル２１０と２次側受電コイル２２０の両コイルが、電磁誘導結合により２次側受電コイル２２０に交流電圧が誘起され、受電回路部３２３に供給され、電子機器３２０の２次電池３２１の充電が行われている場合、送電装置３１０と電気機器２との間で、１次側送電コイル２１０及び２次側受電コイル２２０を介して２次電池３２１の充電情報の送信が行われる。例えば、２次電池３２１の充電の継続が必要な場合は、１次側送電コイル２１０からの電力伝送を継続する。また、２次電池３２１の充電が完了した場合は、電力伝送を停止する。また何らかの異常を示す情報が供給されたような場合にも電力伝送を停止する制御を行う。 In the present embodiment, an AC voltage is induced in the secondary power receiving coil 220 by the electromagnetic induction coupling between the primary power transmitting coil 210 and the secondary power receiving coil 220, and is supplied to the power receiving circuit unit 323. When the secondary battery 321 of the electronic device 320 is being charged, the secondary battery 321 is interposed between the power transmission device 310 and the electric device 2 via the primary side power transmission coil 210 and the secondary side power reception coil 220. The charging information is transmitted. For example, when the secondary battery 321 needs to be continuously charged, the power transmission from the primary power transmission coil 210 is continued. Further, when charging of the secondary battery 321 is completed, power transmission is stopped. Control is also performed to stop power transmission when information indicating some abnormality is supplied.
　なお、本実施の形態では、コイルユニットを充電装置及び電子機器、またワイヤレス電力伝送装置に用いた例について説明したが、コイルユニットは、携帯端末等どのような電子機器に適用してもよい。電磁誘導により非接触で電力を伝送する機器であれば、どのような装置でもよく、例えば携帯電話機等の携帯端末装置に適用してもよい。当然のことながら、コイルユニットは、送電コイル又は受電コイルのいずれであってもよい。 In this embodiment, an example in which the coil unit is used for a charging device and an electronic device or a wireless power transmission device has been described. However, the coil unit may be applied to any electronic device such as a portable terminal. Any device may be used as long as the device transmits electric power in a non-contact manner by electromagnetic induction. For example, the device may be applied to a mobile terminal device such as a mobile phone. As a matter of course, the coil unit may be either a power transmission coil or a power reception coil.
　以上の説明は本発明の好適な実施の形態の例証であり、本発明の範囲はこれに限定されることはない。 The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.
　また、上記各実施の形態では、コイルユニット及び電力伝送装置という名称を用いたが、これは説明の便宜上であり、コイルユニットは平面コイル、送電コイル又は受電コイル、電力伝送装置はワイヤレス電力伝送装置、非接触電力伝送システム等であってもよい。 In the above embodiments, the names of the coil unit and the power transmission device are used. However, this is for convenience of explanation, and the coil unit is a planar coil, a power transmission coil or a power reception coil, and the power transmission device is a wireless power transmission device. A non-contact power transmission system or the like may be used.
　さらに、上記コイルユニットを構成する各部、例えば線状導体、磁性体シート等の種類・形状、取付方法などは前述した実施の形態に限られない。また、線状導体は、スパイラル状に巻回して形成されていればよく、形状は円形のほか、矩形を含む多角形でもよい。 Furthermore, each part constituting the coil unit, for example, the type and shape of the linear conductor, the magnetic sheet, the mounting method, and the like are not limited to the above-described embodiment. The linear conductor may be formed by being spirally wound, and the shape may be a circle or a polygon including a rectangle.
　２０１２年４月２日出願の特願２０１２－０８３９６３の日本出願に含まれる明細書、図面および要約書の開示内容は、すべて本願に援用される。 The disclosure of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2012-089633 filed on April 2, 2012 is incorporated herein by reference.
　本発明のコイルユニット及び電力伝送装置は、例えば充電装置などの送電装置に受電対象物である電子機器等を着脱可能に装着又は接近させ、送電装置から電子機器等に対して電磁誘導により非接触で電力伝送するためのコイルユニット及びコイルユニットを備える電力伝送装置全般に適用することが可能である。 The coil unit and the power transmission device according to the present invention, for example, attach or detachably attach an electronic device or the like as a power receiving object to a power transmission device such as a charging device, and contact the electronic device or the like from the power transmission device without electromagnetic contact. The present invention can be applied to a coil unit for transmitting electric power and a power transmission device including the coil unit in general.
　１００、１００Ａ、１００Ｂ、１００Ｃ　コイルユニット
　１１０、１６０　線状導体
　１１１　平面渦巻きコイル
　１１５　線間隙（内周部線間隙）
　１１６　外周部線間隙
　１２０　基板
　１３０　磁性体シート
　１４０　始端端子
　１５０　終端端子
　２１０　１次側送電コイル
　２２０　２次側受電コイル
　３００　ワイヤレス電力伝送装置
　３１０　送電装置
　３１２　送電制御部
　３１３　送電回路部
　３２０　電子機器
　３２１　２次電池
　３２２　充電制御回路
　３２３　受電回路部
　３２４　受電制御部
  100, 100A, 100B, 100C Coil unit 110, 160 Linear conductor 111 Planar spiral coil 115 Line gap (inner peripheral line gap)
116 Outer peripheral line gap 120 Substrate 130 Magnetic sheet 140 Start terminal 150 End terminal 210 Primary side power transmission coil 220 Secondary side power reception coil 300 Wireless power transmission device 310 Power transmission device 312 Power transmission control unit 313 Power transmission circuit unit 320 Electronic device 321 2 Secondary battery 322 Charging control circuit 323 Power receiving circuit unit 324 Power receiving control unit

Claims (6)

  1. 　線状導体の線間が所定の線間隙となるように、前記線状導体をスパイラル状に巻回して形成された平面コイルと、
    　前記平面コイルの線間隙が保たれた状態で支持する支持体と、
    　を備えるコイルユニット。     A planar coil formed by spirally winding the linear conductor so that a gap between the linear conductors is a predetermined line gap;
    A support for supporting the planar coil in a state in which the line gap is maintained;
    A coil unit comprising:
  2. 　前記線状導体の断面最大長さをＷｋ、前記線状導体間の間隔をＷｓとした場合、以下の関係を満たす、
    　請求項１記載のコイルユニット。
    　Ｗｋ×０．２≦Ｗｓ≦Ｗｋ×３．５     When the maximum cross-sectional length of the linear conductor is Wk and the interval between the linear conductors is Ws, the following relationship is satisfied:
    The coil unit according to claim 1.
    Wk × 0.2 ≦ Ws ≦ Wk × 3.5
  3. 　前記線状導体間の前記線間隙は、前記平面コイルの内周部より外周部の間隙が狭い、請求項１記載のコイルユニット。 The coil unit according to claim 1, wherein the gap between the linear conductors is narrower at the outer peripheral portion than the inner peripheral portion of the planar coil.
  4. 　前記平面コイルの送受電面と反対の面を覆う磁性体シートを備える、請求項１記載のコイルユニット。 The coil unit according to claim 1, further comprising a magnetic sheet that covers a surface opposite to a power transmission / reception surface of the planar coil.
  5. 　請求項１に記載のコイルユニットを用いて構成され、前記平面コイルの磁性体との対向面とは反対側の面が送電側の面に配置された送電コイルと、該送電コイルに電力を供給する送電部と、
    　を含む電力伝送装置。     A power transmission coil configured using the coil unit according to claim 1, wherein a surface opposite to the surface facing the magnetic body of the planar coil is disposed on a surface on the power transmission side, and power is supplied to the power transmission coil A power transmission unit to
    Power transmission device including
  6. 　請求項１に記載のコイルユニットを用いて構成され、前記平面コイルの磁性体との対向面とは反対側の面が受電側の面に配置された受電コイルと、該受電コイルで受電された電力を出力する受電装置と、
    　を含む電力伝送装置。
          A power receiving coil configured using the coil unit according to claim 1 and having a surface opposite to a surface facing the magnetic body of the planar coil disposed on a power receiving side, and the power received by the power receiving coil A power receiving device that outputs power;
    Power transmission device including
PCT/JP2013/002294 2012-04-02 2013-04-02 Coil unit, and power transmission device equipped with coil unit WO2013150785A1 (en)

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