JP5747446B2 - Coil for wireless power transmission with power feeding unit and wireless power feeding system - Google Patents

Description

The present invention relates to a wireless power transmission coil that wirelessly transmits power to a power receiving coil by being magnetically coupled to the power receiving coil by magnetic field resonance, and a wireless power feeding system including the same.

  In the automobile manufacturing process, the connection between an electrical component mounted on the automobile and a wire harness including an electric wire that supplies electric power to the electrical component is performed manually. In recent years, with the increase in the number of electrical components (electronic devices) mounted on automobiles, labor for connecting connectors between electrical components and wire harnesses has increased. Therefore, it is required to reduce the labor for connector connection.

  2. Description of the Related Art Conventionally, a wireless power feeding system that supplies electric power to an electrical component wirelessly has been proposed in order to reduce the labor of connector connection. For example, Patent Literature 1, Patent Literature 2, and Patent Literature 3 show wireless power feeding systems using electromagnetic induction coils or microwave waveguides. The adoption of the wireless power feeding system greatly reduces the labor of connecting the connector.

  On the other hand, Patent Document 4 discloses a wireless power feeding system for a vehicle that performs power transmission by a resonance method. In power transmission by the resonance method, the secondary coil provided in the vehicle is magnetically coupled to the primary coil provided in the parking lot by magnetic field resonance, so that power is transmitted from the primary coil wirelessly. Receive power. Details of power transmission by the resonance method are shown in Non-Patent Document 1. By adopting power transmission by the resonance method, it is possible to transmit several kilowatts of power to several meters ahead.

  In wireless power feeding by electromagnetic induction, if the positional relationship between the power transmission coil and the power receiving coil deviates from the ideal positional relationship facing each other and close to each other, the power transmission efficiency (power feeding efficiency) is significantly deteriorated. . On the other hand, the wireless power feeding by the resonance method has a relatively small degree of deterioration in power transmission efficiency (power feeding efficiency) according to the magnitude of the positional deviation between the power transmission coil and the power receiving coil compared to the wireless power feeding by electromagnetic induction. .

  In addition, in wireless power feeding by electromagnetic induction, if a conductive obstacle such as a metal member that disturbs a magnetic field exists between a power transmission coil and a power reception coil, power transmission efficiency is significantly deteriorated due to energy loss. On the other hand, in the wireless power feeding by the resonance method, the degree of energy loss due to the presence of a conductive member between the power transmission coil and the power receiving coil is relatively small compared to the wireless power feeding by electromagnetic induction.

JP 2001-298879 A JP 2002-252937 A JP 2003-52137 A JP 2009-106136 A

Andre Kurs et al., "Wireless Power Transfer via Strongly Coupled Magnetic Resonances", Science Vol. 317. no. 5834, pp.83-86, July 6, 2007, URL: http://www.sciencemag.org/cgi /reprint/317/5834/83.pdf

  By the way, in order to obtain practical power transmission efficiency, a wireless power feeding system using electromagnetic induction requires that a power feeding coil and a power receiving coil be brought close to each other within several centimeters. Therefore, in a wireless power feeding system using electromagnetic induction, when power is supplied to each of a plurality of electrical components, a power transmission coil is required for each combination of the electrical components and the power receiving coil, and the work of attaching the power transmission coil is complicated. There was a problem. In particular, when an electrical component such as an optional product is added, it is necessary to add a power transmission coil corresponding to the electrical component to be added and wiring for the power transmission coil, which is complicated. Furthermore, there is a problem in that the installation space of the coil is large and the degree of freedom of arrangement of the power transmission coil and the power reception coil is low.

  In addition, wireless power feeding using microwaves requires a relatively large waveguide for transmitting microwaves, and further, a power receiving unit of an electrical component needs to be arranged along the waveguide. For this reason, the wireless power feeding using microwaves has a problem that the installation space of the waveguide is large, and the degree of freedom of arrangement of the power receiving unit of the electrical component is low. In addition, the power transmission efficiency of wireless power feeding using microwaves is by no means high at about 55% or less at the current technical level. Therefore, there is a problem that wireless power feeding using microwaves is not practical to be applied to a power feeding system using a battery as a power source, like a power feeding system in an automobile.

  On the other hand, in the wireless power feeding by the resonance method, the positional relationship between the power transmission coil and the power reception coil is relatively loose, so that it is possible to wirelessly transmit power from one power transmission coil to a plurality of power reception coils. is there. Therefore, when power is supplied to each of the plurality of electrical components by the wireless power feeding system based on the resonance method, the number of power transmission coils can be made smaller than the number of electrical components, and the work of attaching the power transmission coils is simplified. The effect is obtained.

  However, in the wireless power feeding by the resonance method, the positional relationship between the power transmission coil and the power reception coil is relatively loose, but if the positional deviation between the power transmission coil and the power reception coil is large, the power transmission Efficiency deteriorates. Therefore, when wirelessly transmitting power from a single power transmission coil to a plurality of power reception coils, the power transmission coil is divided into a plurality of tens of centimeters to twenty tens of centimeters in which the range in which electrical components may be arranged is divided. It is necessary to arrange every small range of about meters.

  For example, when the range in which electric parts such as optional items may be added is wider than the range in which power can be transmitted with sufficient power transmission efficiency with one power transmission coil, a plurality of power transmission coils are included in the wide range. There is a problem that it is necessary to provide them in advance, which increases the man-hours for installing the power transmission coil and the installation space. Therefore, when it is desired to increase the degree of freedom of the mounting position of the electrical component, the problem of increasing the man-hour for installing the power transmission coil and the installation space becomes more prominent.

  Moreover, like a motor for driving a door built in a sliding door in an automobile, an electrical component may be provided in a moving unit that moves in a relatively wide range. In such a case, when the moving range of the power receiving coil provided in the moving unit is wider than the range in which power can be transmitted with sufficient power transmission efficiency by one power transmitting coil, a plurality of power transmitting coils are included in the wide range. Need to be provided. For this reason, there is a problem in that the number of man-hours for installing the power transmission coil and the installation space increase.

  As described above, the wireless power feeding system based on the resonance method has a problem that further improvement is required with respect to the reduction in the number of installation steps and installation space of the power transmission coil and the improvement in the degree of freedom of the installation position of the power reception coil and the electrical components. There was a point. In particular, in an application target in which a large number of electrical components and wire harnesses are provided in a limited space, such as an automobile, the problem of the installation space for the power transmission coil becomes more prominent.

  SUMMARY OF THE INVENTION An object of the present invention is to realize a system for supplying power to an electrical component wirelessly using a power transmission coil and a power reception coil, and can reduce the number of parts mounting man-hours and save the space for the power transmission coil. It is possible to increase the degree of freedom of the attachment position of the coil and the electrical component.

In order to achieve the above object, a power transmission coil with a power feeding section according to a first aspect of the present invention is a coil that wirelessly transmits power to a power receiving coil by being magnetically coupled to the power receiving coil by magnetic field resonance. Each of a pair of output terminals of AC power formed in a double helix that is wound in the same direction without contact with each other around the straight line or the curved line. and shall comprise a pair of conductors emits a magnetic field force is varied by being connected to, and is connected to each of said pair of conductors has a pair of output ends of the AC power, the pair of conductors to And a power supply unit for supplying AC power.

  In addition to the configuration of the wireless power transmission coil according to the first invention, the wireless power transmission coil according to the second invention is formed along the one straight line or the one curve, and the pair of conductors are wound around the circumference. And a further insulator.

  A wireless power transmission coil according to a third aspect of the present invention comprises the configuration of the wireless power transmission coil according to the second aspect of the present invention, and the insulator has flexibility.

A wireless power feeding system according to a fourth invention includes the following components.
(1) The first component is formed in a double spiral shape that winds in the same direction without contact with each other around the straight line or the curved line along the straight line or the curved line. It is a power transmission coil having a pair of conducting wires that generate a magnetic field whose magnetic force varies by being connected to each of a pair of power output ends. Moreover, it has a pair of output terminal of alternating current power connected to each of a pair of said conducting wire, and is provided with the electric power feeding part which supplies alternating current power with respect to said pair of conducting wire.
(2) The second component is a power receiving coil that wirelessly receives power from the power transmitting coil by being magnetically coupled to the power transmitting coil by magnetic field resonance, and supplies the received power to an electrical component. is there.

  A wireless power feeding system according to a fifth aspect of the present invention includes the configuration of the wireless power feeding system according to the fourth aspect of the present invention, and further includes the following configuration. In other words, the power receiving coil is provided in a moving part that movably supports the electrical component. Further, the power transmission coil is formed along the one straight line or one curve along a movement path of the power reception coil provided in the moving unit.

  A wireless power supply system according to a sixth aspect of the invention includes the configuration of the wireless power supply system according to the fourth aspect of the invention, and further includes the following configuration. That is, the plurality of power receiving coils are provided at different positions corresponding to the plurality of electrical components. Further, the power transmission coil is formed along the one straight line or one curve passing through a position facing each of the plurality of power receiving coils.

  A wireless power feeding system according to a seventh aspect includes the configuration of the wireless power feeding system according to the fourth aspect, and further includes the following components. The component is an electrical component configured to hold the power receiving coil together with the electrical component and be attachable to a support portion provided at a position facing a part of the power transmission coil disposed in advance. It is a holding part.

  The power transmission coil for wireless power transmission according to the present invention (first to seventh inventions) is formed to be elongated along a straight line or a curved line, and the cross-sectional area thereof is relatively small, like a harness. It is formed. Therefore, when the power receiving coil can exist over a wide range, the power transmitting coil according to the present invention can be disposed so as to pass through a narrow gap over the wide range. Therefore, according to the present invention, compared to the conventional case where a plurality of power transmission coils are individually mounted within a wide range corresponding to the position of the power receiving coil, the number of parts mounting man-hours and the space saving of the power transmission coil are reduced. Can be realized. Furthermore, according to the present invention, since the power transmission coil is continuously disposed along one straight line or one curve, the power reception coil can be disposed at any position along the power transmission coil. . Therefore, according to the present invention, it is possible to increase the degree of freedom of the attachment position of the power receiving coil and the electrical component fed from the power receiving coil.

  Moreover, since the coil for radio | wireless power transmission which concerns on 2nd invention is equipped with the insulator with which a pair of conducting wire was wound around, the shape of the whole coil is easy to be hold | maintained with the shape of an insulator, and handling at the time of conveyance and attachment is easy It becomes easy. For example, if the insulator is formed in a shape along a path along which the wireless power transmission coil is to be disposed, the operation of disposing the wireless power transmission coil becomes easy. Further, when the wireless power transmission coil according to the third invention is adopted, the insulator has flexibility, and therefore the work of arranging the wireless power transmission coil along the curved path becomes easy.

  In the wireless power feeding system according to the fifth aspect of the invention, since the power transmission coil is disposed along the movement path of the moving power reception coil, the power reception coil and the power transmission coil are arranged even when the power reception coil moves. The relative positional relationship of is kept constant. Therefore, according to the fifth aspect of the invention, even if the power receiving coil moves, the condition of wireless power transmission is maintained constant, and stable power transmission is possible.

  In the wireless power feeding system according to the sixth aspect of the present invention, the power transmission coil is formed along one straight line or one curve passing through a position facing each of the plurality of power receiving coils. Therefore, the positional relationship between one power transmission coil and each of the plurality of power reception coils can be made substantially the same. Therefore, according to the sixth aspect, variation in power transmission efficiency between one power transmission coil and each of the plurality of power reception coils is reduced, and stable power transmission is possible.

  In the wireless power feeding system according to the seventh aspect of the present invention, the electrical component holding unit can hold the power receiving coil together with the electrical component and can be attached to a support unit provided at a position facing a part of the power transmitting coil. Configured. In this case, after the power transmission coil is disposed along a predetermined path, the electrical component holding unit can be attached to a predetermined position facing the power transmission coil without connecting the connector to the electrical component. Can be fed. Therefore, according to the seventh aspect, the man-hours for attaching the power receiving coil and the electrical component are further reduced.

1 is a schematic configuration diagram of a wireless power feeding system 1 according to an embodiment of the present invention. 2 is a perspective view of a first example of a power transmission coil applicable to the wireless power feeding system 1. FIG. 6 is a perspective view of a second example of a power transmission coil applicable to the wireless power feeding system 1. FIG. 1 is a schematic perspective view of a wireless power feeding system 1A that is a first application example of a wireless power feeding system 1. FIG. 1A is a first plan view schematically showing a wireless power feeding system 1A. FIG. FIG. 3 is a second plan view schematically showing the wireless power feeding system 1A. 6 is a schematic perspective view of a wireless power feeding system 1B that is a second application example of the wireless power feeding system 1. FIG. 4 is a schematic cross-sectional view of a wireless power feeding system 1C that is a third application example of the wireless power feeding system 1; It is a perspective view of the electrical equipment unit which comprises 1 C of radio | wireless electric power feeding systems.

  Hereinafter, the wireless power feeding system 1 according to the embodiment of the present invention will be described with reference to the schematic configuration diagram shown in FIG. 1. A wireless power feeding system 1 is a system that is mounted on a vehicle such as an automobile and wirelessly supplies power to a plurality of electrical components provided on the vehicle or moving electrical components from a power transmission coil disposed in the vehicle. It is.

  As shown in FIG. 1, the wireless power feeding system 1 includes a battery 8, a wire harness 9, a power feeding unit 10, a power transmission coil 20, and an electrical component unit 30. The power supply unit 10 includes an oscillation circuit 11 and an amplification circuit 12. Further, the electrical component unit 30 includes a power receiving coil 31, a rectifier circuit 32, and an electrical device 33 that is an electrical component such as an electronic device or a motor.

  The battery 8 is a main storage battery that is mounted on the vehicle and is charged according to the traveling state of the vehicle. The battery 8 is a basic storage battery for all electrical components mounted on the vehicle. The battery 8 is, for example, a lead storage battery or a nickel / hydrogen storage battery. The wire harness 9 is connected to the battery 8 and the power supply unit 10 and transmits DC power output from the battery 8 to the power supply unit 10.

  The power feeding unit 10 is connected to the wire harness 9 and the power transmission coil 20, converts DC power into high frequency AC power, and supplies the AC power to the power transmission coil 20.

  The oscillation circuit 11 in the power supply unit 10 is a circuit that converts DC power supplied from the battery 8 through the wire of the wire harness 9 into high-frequency AC power. For example, the oscillation circuit 11 generates AC power having a frequency of about 1 MHz to 100 MHz. The amplifier circuit 12 is a circuit that amplifies the high-frequency AC power generated by the oscillation circuit 11 and supplies the amplified AC power to the power transmission coil 20.

  The power transmission coil 20 is a wireless power transmission coil that wirelessly transmits power to the power reception coil 31. The power transmission coil 20 includes a pair of conductors 21 and 22 that generate a magnetic field whose magnetic force varies by being connected to each of a pair of output ends of AC power supplied from the power supply unit 10. The pair of conductive wires 21 and 22 are formed in a non-contact manner along one straight line or one curve, and are formed in a double spiral shape wound around the one straight line or one curve in the same direction. Has been.

  The pair of conductive wires 21 and 22 are spirally wound so that the cross section of the power transmission coil 20 is circular, and the cross section of the power transmission coil 20 is elliptical, rectangular, or other polygonal shape. It is also conceivable to be wound in a spiral. That is, the cross-sectional shape of the power transmission coil 20 in which the pair of conducting wires 21 and 22 are wound in a double spiral shape may be an ellipse, a rectangle, or another polygon in addition to a circle.

  In the example shown in FIG. 1, the pair of conductive wires 21 and 22 in the power transmission coil 20 are formed in a double spiral shape wound around the straight line 20 a along one straight line 20 a in the left and right direction toward the paper surface. Has been. In FIG. 1, for the sake of convenience, the two conducting wires 21 and 22 are drawn with different thicknesses, but usually the two conducting wires 21 and 22 have the same thickness. In addition, an insulating coating (not shown) is formed around the two conducting wires 21 and 22 so that the insulating coating does not short-circuit the two conducting wires 21 and 22 (non-contact). It is separated.

  As shown in FIG. 1, the power transmission coil 20 is formed to be elongated along a straight line or a curved line. For example, the power transmission coil 20 is formed with a cross-sectional diameter of about 5 mm to 30 mm and a length of about several hundred millimeters to tens of meters.

  In the example shown in FIG. 1, only one electrical component unit 30 is shown, but a plurality of electrical component units 30 may be provided at a plurality of positions along the power transmission coil 20. It is also conceivable that the electric component unit 30 moves along the power transmission coil 20 by being held by a predetermined moving unit.

  Although omitted in FIG. 1, the power transmission coil 20 also includes a core member 23 that is an insulating member that becomes the core of a pair of conductive wires 21 and 22 wound in a spiral.

  2 and 3 are perspective views of a first example and a second example of the power transmission coil 20 including the core member 23. FIG. A power transmission coil 20 shown in FIG. 2 includes a core member 23 made of a flexible insulator formed along one straight line 20 b, and a pair of conductors 21 and 22 are arranged around the core member 23. Are wound in a double spiral shape in the same winding direction.

  Since the original shape of the core member 23 shown in FIG. 2 is a rod shape along the straight line 20b, the power transmission coil 20 as a whole has a rod shape along the straight line 20b. However, since the core member 23 has flexibility, the power transmission coil 20 bends and curves as shown in FIG. 2 when receiving an external force. By adopting such a power transmission coil 20, the core member 23 (insulator) has flexibility, so that the work of arranging the power transmission coil 20 along a curved path becomes easy. The material of the core member 23 (insulator) having flexibility is, for example, polypropylene.

  On the other hand, the power transmission coil 20 shown in FIG. 3 includes a core member 23 made of an insulator formed along one curve 20c, and the pair of conductors 21 and 22 are the same around the core member 23. It is wound in a double helix in the winding direction.

  The core member 23 shown in FIG. 3 is formed in a shape along a path on which the power transmission coil 20 is to be disposed. Employing such a power transmission coil 20 facilitates the work of disposing the power transmission coil 20 along the target path.

  The material of the core member 23 (insulator) shown in FIG. 3 is considered to be a highly rigid member such as ABS resin. It is also conceivable that the core member 23 shown in FIG. 3 is a flexible insulator. Thereby, even when there is a slight error between the shape of the power transmission coil 20 and the shape of the part to which it is attached, the flexibility can absorb the influence of the error.

  The power transmission coil 20 includes the core member 23 as shown in FIG. 2 or FIG. 3, whereby the shape of the entire coil is easily held in the shape of the core member 23, and handling during transportation and attachment becomes easy. .

The power receiving coil 31 in the electrical component unit 30 is a coil that receives power by being magnetically coupled to the power transmitting coil 20 by magnetic field resonance . That is, the power transmission coil 20 and the power reception coil 31 are coils that perform wireless power feeding. The power receiving coil 31 is composed of two coils arranged on the same axis, and each coil is connected to each of a pair of input ends of the rectifier circuit 32. Such a power receiving coil 31 is a conventional normal wireless power feeding coil, and the conventional power transmitting coil has the same structure as the power receiving coil 31.

  When the power receiving coil 31 is present within a range of a distance of several centimeters to about twenty centimeters with respect to the power transmitting coil 20, the power receiving coil 31 is magnetically coupled to the magnetic field generated by the power transmitting coil 20. To receive power.

  For example, when there are a plurality of power receiving coils 31 within a distance of several centimeters to about twenty centimeters with respect to the power transmitting coil 20, the plurality of power receiving coils 31 are one power transmission coil. Power is received from 20 in parallel. Further, when the power receiving coil 31 moves along the power transmitting coil 20 within a distance of several centimeters to about twenty centimeters with respect to the power transmitting coil 20, the power receiving coil 31 moves. In this process, the relative positional relationship with the power transmission coil 20 is maintained, and as a result, the condition of wireless power feeding from the power transmission coil 20 to the power reception coil 31 is maintained constant.

  The rectifier circuit 32 in the electrical component unit 30 is a circuit that rectifies AC power obtained by the power receiving coil 31 and converts it into DC power. The DC power output from the rectifier circuit 32 is supplied to the electrical equipment 33. As a result, the electrical equipment 33 operates by consuming the power received by the power receiving coil 31.

  In the wireless power feeding system 1, like the wire harness 9, the power transmission coil 20 is formed to be elongated along a straight line or a curved line, and has a relatively small cross-sectional area. Therefore, when the power receiving coil 31 can exist over a wide range, the power transmission coil 20 can be disposed so as to pass through a narrow gap over the wide range. Therefore, according to the wireless power feeding system 1, compared to the conventional case where a plurality of power transmission coils are individually mounted within a wide range corresponding to the position of the power reception coil, the number of parts mounting man-hours and the power transmission coil can be reduced. Space can be realized.

  In the wireless power feeding system 1, since the power transmission coil 20 is continuously disposed along one straight line or one curve, the power reception coil 31 can be disposed at any position along the power transmission coil 20. is there. Therefore, according to the wireless power feeding system 1, the degree of freedom of the attachment position of the power receiving coil 31 and the electrical equipment 33 that is fed from the power receiving coil 31 can be increased.

<First application example>
Next, a wireless power feeding system 1A that is a first application example of the wireless power feeding system 1 will be described with reference to FIGS. The wireless power feeding system 1 </ b> A is an example in which the wireless power feeding system 1 is applied to power feeding a motor that is an electrical equipment 33 in an electric sliding door 6 of an automobile. 4 is a schematic perspective view of the wireless power feeding system 1A, and FIGS. 5 and 6 are schematic plan views of the wireless power feeding system 1A in a state where the sliding door 6 is closed and opened, respectively. is there.

  In the wireless power feeding system 1A, the power receiving coil 31 and the rectifier circuit 32 are attached to a slide door 6 that is a moving unit that movably supports the electrical equipment 33 (motor). That is, the electrical component unit 30 is attached to the slide door 6. The electrical equipment 33 (motor) provided in the slide door 6 is, for example, a motor that drives the slide door 6 or a motor for a power window that drives the window glass of the slide door 6.

  In the wireless power feeding system 1A, the power feeding unit 10 and the power transmission coil 20 are arranged on the main body side of the automobile. The power transmission coil 20 is formed along a curved line along the movement path of the power reception coil 31 attached to the moving slide door 6.

  As shown in FIGS. 5 and 6, the slide door 6 is provided with an arm portion 6a supported by a rail 7 provided on the main body side of the automobile. That is, the arm part 6a which is a part of the slide door 6 moves along the rail 7 on the main body side of the automobile. The rail 7 is provided along one curve on the main body side of the automobile.

  The power receiving coil 31 in the wireless power feeding system 1A is attached to, for example, an arm portion 6a that is a part of the slide door 6. The arm portion 6a is provided on each of the upper end portion and the lower end portion of the slide door 6, and the power receiving coil 31 is attached to, for example, the lower arm portion 6a.

  In the wireless power feeding system 1A, the power transmission coil 20 is provided along the rail 7 on the main body side of the automobile, as shown in FIGS. Thereby, the coil 20 for power transmission will be in the state which follows the one curve along the movement path | route of the coil 31 for power reception provided in the slide door 6. FIG.

  In the wireless power feeding system 1 </ b> A, the power transmission coil 20 is disposed along the moving path of the moving power reception coil 31, so that even if the power reception coil 31 moves, The relative positional relationship is kept constant. Therefore, according to the wireless power feeding system 1A, even if the power receiving coil 31 moves, the wireless power transmission conditions are maintained constant, and stable power transmission is possible.

  The examples shown in FIGS. 4 to 6 are examples in which the power receiving coil 31 moves along a single curve, but in the wireless power feeding system 1, the power receiving coil 31 moves along a single straight line. The same applies to the subject. In this case, the power receiving coil 31 is provided in a moving unit that supports the electrical equipment 33 so as to be movable along a straight line. The power transmission coil 20 is formed along a straight line along the movement path of the power reception coil 31 provided in the moving unit.

<Second application example>
Next, a wireless power feeding system 1B that is a second application example of the wireless power feeding system 1 will be described with reference to FIG. The wireless power supply system 1B is an example in which the wireless power supply system 1 is applied to supply power to a plurality of electrical devices in the instrument panel 5 of the automobile and a plurality of electrical devices around the left and right seats.

  In the wireless power feeding system 1 </ b> B, the power feeding unit 10 is provided in the instrument panel 5. The wireless power feeding system 1 </ b> A includes a power transmission coil 20 that is arranged linearly or curvedly so as to cross the instrument panel 5, and a space between the right and left seats from the power feeding unit 10 in the instrument panel 5. And a power transmission coil 20 arranged in a curved line extending in the direction.

  The power transmission coil 20 provided so as to traverse the inside of the instrument panel 5 performs wireless power feeding to the plurality of electrical component units 30 attached to the instrument panel 5. The electrical component unit 30 attached to the instrument panel 5 includes, for example, an air conditioning control unit including an air conditioning control circuit (electrical equipment), a car navigation device including electrical equipment such as a liquid crystal panel and a map data storage device, and a tuner. And an audio device including electrical equipment such as a music data reproducing device and an indicator unit including electrical equipment such as a speed meter and a fueling indicator.

  Further, the power transmission coil 20 arranged in a curved shape extending from the inside of the instrument panel 5 to the space between the left and right seats 4 performs wireless power feeding to the electrical component unit 30 arranged around the left and right seats. The electrical component unit 30 arranged around the left and right seats includes, for example, a console switch unit including a switch and a control circuit for controlling the lighting and extinguishing of the indoor lamp, a lighting lamp in the accessory storage box, A box lamp unit including a switch for switching the seat, a seat control unit including a motor for moving the seat back and forth and for rotating the backrest in each of the left and right seats.

  In the wireless power feeding system 1 </ b> B, the power transmission coil 20 is along a straight line (inside the instrument panel 5) that passes through a position facing each of the plurality of power reception coils 31 provided in each of the plurality of electrical component units 30. Or along one curve (between the left and right seats). Therefore, the positional relationship between one power transmission coil 20 and each of the plurality of power reception coils 31 opposed thereto can be made substantially the same. Therefore, according to the wireless power feeding system 1B, variation in power transmission efficiency between one power transmission coil 20 and each of the plurality of power reception coils 31 opposed thereto is reduced, and stable power transmission is possible.

<Third application example>
Next, a wireless power feeding system 1 </ b> C that is a third application example of the wireless power feeding system 1 will be described with reference to FIGS. 8 and 9. The wireless power feeding system 1 </ b> C is an example in which the wireless power feeding system 1 is applied to power feeding to a plurality of electrical devices arranged inside or near the roof lining of an automobile.

  FIG. 8 is a schematic diagram showing a plane cross-section of roof lining provided with the wireless power feeding system 1C. As shown in FIG. 8, in the wireless power feeding system 1C, the power feeding unit 10 is provided in a roof lining on the front side of the automobile. Further, in the wireless power feeding system 1 </ b> C, the power transmission coil 20 is a curved line that passes through a position facing and facing each of the plurality of electrical component units 30 arranged near the outer edge of the roof lining and the rear center of the roof lining. (A part is a straight line). Moreover, the electrical component unit 30 indicated by reference numeral 30A in FIG. 8 is an optional component. Hereinafter, the electrical component unit 30 that is an optional component is referred to as an optional electrical component unit 30A.

  FIG. 9 is a perspective view of an optional electrical component unit 30A constituting the wireless power feeding system 1C. The optional electrical component unit 30A includes a power receiving coil 31, a rectifier circuit 32, and an electrical component 33, and further includes an operation switch 34 and a housing 35.

  The operation switch 34 is a switch for switching whether or not to supply power from the power receiving coil 31 to the electrical equipment 33 according to a human operation. The casing 35 is a member that contains the coil 31 for power reception, the rectifier circuit 32, the electrical equipment 33, and the operation switch 34, and holds them together. For example, the electrical equipment 33 in the optional electrical component unit 30A is a lamp that illuminates the interior of a car.

  Further, as shown in FIG. 9, the casing 35 is formed with a claw portion 35 </ b> A for enabling attachment to the support portion 3 provided at a position facing a part of the power transmission coil 20. . The support portion 3 is a portion in which an opening in the vehicle body frame located at the outer edge portion of the rule lining is formed. When the housing 35 is fitted into the opening of the support portion 3, the claw portion 35 </ b> A of the housing 35 is engaged with the edge of the opening of the support portion 3, and the entire optional electrical component unit 30 </ b> A including the housing 35 is supported by the support portion 3. 3 is held. Further, by attaching the optional electrical component unit 30 </ b> A to the support portion 3, the power receiving coil 31 in the optional electrical component unit 30 </ b> A approaches and partially opposes a part of the power transmitting coil 20. Thereby, the electrical equipment 33 in the optional electrical component unit 30A is wirelessly supplied with power from the power transmission coil 20 when the operation switch 34 is in the ON state.

  In the wireless power feeding system 1C, after the power transmission coil 20 is disposed along a predetermined path, the casing 35 constituting the optional electrical component unit 30A is connected to the power transmission coil 20 without a connector connection work. Power can be supplied to the electrical equipment 33 in the housing 35 only by being attached to the facing position (support portion 3). Therefore, according to the wireless power feeding system 1 </ b> C, the man-hours for attaching the power receiving coil 31 and the electrical equipment 33 are further reduced.

  The first to third application examples described above are vehicle wireless power supply systems suitable for application of the wireless power supply system 1, but the wireless power supply system 1 may be applied to other objects.

  In the wireless power feeding system 1, the core member 23 is not an essential component of the power transmission coil 20, but it is desirable that the core member 23 be provided in order to facilitate handling of the power transmission coil 20.

DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C Wireless electric power feeding system 3 Support part 5 Instrument panel 6 Slide door 6a Arm part 8 Battery 9 Wire harness 10 Electric power feeding part 11 Oscillation circuit 12 Amplifier circuit 20 Power transmission coil 21,22 Conductor 30 Electrical component unit 30A Optional electrical component unit 31 Coil for receiving power 32 Rectifier circuit 33 Electrical equipment 34 Operation switch 35 Housing 35A Claw

Claims (7)

A wireless power transmission coil that wirelessly transmits power to the power receiving coil by being magnetically coupled to the power receiving coil by magnetic field resonance, wherein the one straight line or a single curve A pair of conductors that are formed in a double spiral shape that is not contacted with each other and wound in the same direction around one curve, and that generates a magnetic field whose magnetic force varies by being connected to each of a pair of output ends of AC power. With what
A power supply unit connected to each of the pair of conductive wires, having the pair of output ends of AC power, and supplying AC power to the pair of conductive wires;
A coil for wireless power transmission with a power feeding unit . The coil for wireless power transmission with a power feeding unit according to claim 1, further comprising an insulator formed along the one straight line or the one curved line and around which the pair of conductive wires are wound. The coil for wireless power transmission with a power feeding unit according to claim 2, wherein the insulator has flexibility. Formed in a double helix that winds in the same direction without contact with each other around one straight line or one curve along one straight line or one curved line, and is connected to each of a pair of output terminals of AC power A power transmission coil having a pair of conductors that generate a magnetic field whose magnetic force varies by being
A power supply unit connected to each of the pair of conductive wires, having the pair of output ends of AC power, and supplying AC power to the pair of conductive wires;
And a power receiving coil that wirelessly receives power from the power transmitting coil by being magnetically coupled to the power transmitting coil by magnetic field resonance, and supplies the received power to an electrical component. system. The power receiving coil is provided in a moving unit that movably supports the electrical component,
The wireless power feeding system according to claim 4, wherein the power transmission coil is formed along the one straight line or one curve along a movement path of the power receiving coil provided in the moving unit. A plurality of power receiving coils are provided at different positions corresponding to each of the plurality of electrical components,
The wireless power feeding system according to claim 4, wherein the power transmission coil is formed along the one straight line or one curve passing through a position facing each of the plurality of power receiving coils.   An electric component holding unit configured to hold the power receiving coil together with the electric component and to be attached to a support unit provided at a position facing a part of the power transmission coil arranged in advance is further provided. The wireless power feeding system according to claim 4.

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