JP6565953B2 - Coil unit, wireless power feeding device, wireless power receiving device, and wireless power transmission device - Google Patents

Description

  The present invention relates to a coil unit, a wireless power feeding device, a wireless power receiving device, and a wireless power transmission device.

  By supplying power via a magnetic field from the power supply coil unit installed on the parking space where the vehicle can be parked to the power receiving coil unit provided on the vehicle side, the vehicle is parked in the parking space. A wireless power supply system that charges an installed battery has been proposed.

  In this wireless power supply system, the development of a power supply coil unit equipped with a sensor to detect that metal foreign matter that may be affected by a magnetic field is mixed between the power supply coil unit and the power reception coil unit. Consideration has been made.

  By the way, since the feeding coil unit is installed on the road surface of the parking space, there is a problem that external stress is easily applied to the built-in components when the vehicle rides on the feeding coil unit. Studies to improve performance are becoming active.

JP 2014-75899 A

  In Patent Document 1, in a non-contact power feeding device, a lid of a protective housing of a power feeding unit has a laminated structure composed of a plurality of resin plates, and uses general-purpose synthetic resin to meet environmental requirements, electrical property requirements, load resistance. There has been proposed a non-contact power feeding device that can satisfy the safety requirements. In this non-contact power feeding device, the metal detection coil is interposed between the upper resin plate and the lower resin plate of the lid for storing the power supply coil body through a film adhesive made of a soft synthetic resin material. Has been.

  However, in the technique disclosed in Patent Document 1, external stress such as impact and load applied when the vehicle is mounted is dispersed by the lid member having a laminated structure made of resin, but the dispersed external stress is still in the housing. There was a problem of being transmitted to internal parts. In particular, there is a problem that this problem appears remarkably with respect to the metal detection coil installed on the outer surface side of the power feeding unit.

  Accordingly, the present invention has been made in view of the above problems, and suppresses the transmission of stress to a sensor installed inside the coil unit when external stress is applied while ensuring the load resistance of the coil unit. For the purpose.

  A coil unit according to the present invention is a coil unit provided on the ground side, and includes a coil, at least one sensor that detects an object that exists above or around the coil unit, and a casing that houses the coil and the sensor. The housing has a coil space for storing the coil, a partition plate that is positioned vertically above the coil space and that partitions the sensor space for storing the sensor, and holds at least an internal space of the sensor space. One sensor is provided, and the sensor is disposed on the partition plate in a non-contact manner with the upper inner surface portion of the housing in the sensor space.

  According to the present invention, the housing holds the inner space of the sensor space, the partition plate that divides the coil space that houses the coil and the sensor space that is positioned vertically above the coil space and houses the sensor. And the sensor is disposed on the partition plate in a non-contact manner with the upper inner surface of the housing in the sensor space. Therefore, since the sensor space is supported by the support column, the load resistance of the coil unit can be ensured. Further, in the sensor space, since a gap is secured between the inner surface of the housing on the side where the vehicle rides and the sensor, external stress such as impact and load when the vehicle rides is directly transmitted to the sensor. It is suppressed. Therefore, it is possible to prevent the stress from being transmitted to the sensor installed inside the coil unit when an external stress is applied while securing the load resistance of the coil unit.

  In the coil unit according to the present invention, the sensor may be a metal detection coil. Accordingly, it is possible to detect a metal foreign matter above or around the coil unit while preventing damage to the sensor inside the coil unit.

  Preferably, the sensor has a hole penetrating in the vertical direction, and the support column extends in the vertical direction through the hole of the sensor. In this case, the load applied to the casing around the sensor is supported by the support column, and the internal space around the sensor in the sensor space can be held.

  Preferably, the coil unit has a plurality of sensors. In this case, the area where the object can be detected by the sensor can be widened.

  Preferably, the housing has a plurality of support columns. In this case, since there are a plurality of locations that support the load applied to the housing, external stress can be dispersed.

  Preferably, the housing may have a protrusion that extends vertically downward from the partition plate in the coil space. In this case, load resistance can be improved against external stress applied to the housing.

  More preferably, the protrusions may have a hollow cylindrical shape. In this case, a small component such as an electronic component can be installed between the hollow spaces, and the space can be used effectively.

  Preferably, the coil is wound with the inner peripheral edge in contact with the protrusion. In this case, since the protrusion and the coil are in contact with each other, the heat radiation area is increased, and heat generated from the coil is efficiently radiated to the outside through the casing. Therefore, the heat dissipation of the coil unit can be improved.

  In the coil unit according to the present invention, the coil may be a coil that exchanges AC power via a magnetic field. Thereby, electric power can be supplied and received while preventing damage to the sensor inside the coil unit.

  A wireless power supply apparatus according to the present invention is a wireless power supply apparatus provided on the ground side, and includes the coil unit. According to the present invention, it is possible to obtain a wireless power feeding apparatus that secures load resistance of a coil unit and suppresses stress from being transmitted to a sensor installed inside the coil unit when external stress is applied.

  A wireless power receiving apparatus according to the present invention is a wireless power receiving apparatus provided on the ground side, and includes the coil unit. ADVANTAGE OF THE INVENTION According to this invention, the wireless power receiving apparatus which suppressed that stress was transmitted to the sensor installed in a coil unit when external stress was added, ensuring the load resistance of a coil unit can be obtained.

  A wireless power transmission device according to the present invention includes a wireless power feeding device provided on the ground side and a wireless power receiving device mounted on a vehicle, and the wireless power feeding device is the wireless power feeding device. ADVANTAGE OF THE INVENTION According to this invention, the wireless power transmission apparatus which suppressed that stress was transmitted to the sensor installed in a coil unit when external stress was added, ensuring the load resistance of a coil unit can be obtained.

  A wireless power transmission device according to the present invention includes a wireless power feeding device mounted on a vehicle and a wireless power receiving device provided on the ground side, and the wireless power receiving device is the wireless power receiving device. ADVANTAGE OF THE INVENTION According to this invention, the wireless power transmission apparatus which suppressed that stress was transmitted to the sensor installed in a coil unit when external stress was added, ensuring the load resistance of a coil unit can be obtained.

  A wireless power transmission device according to the present invention includes a vehicle-side power supply device mounted on a vehicle, and a ground-side power supply device that performs wireless power transfer between the vehicle-side power supply device, The ground side power supply apparatus has the coil unit. According to the present invention, it is possible to obtain a bidirectional wireless power transmission device that suppresses stress from being transmitted to a sensor installed inside a coil unit when external stress is applied while ensuring load resistance of the coil unit. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that stress is transmitted to the sensor installed in a coil unit when external stress is added, ensuring the load resistance of a coil unit.

It is the schematic which shows the wireless power transmission apparatus which concerns on 1st Embodiment of this invention with an electrical storage device. It is a model perspective view which shows the feed coil unit in the wireless power transmission apparatus which concerns on 1st Embodiment of this invention. FIG. 3 is a schematic cross-sectional perspective view of a power feeding coil unit along II in FIG. 2. FIG. 3 is a schematic perspective view showing a feeding coil and a feeding coil space of the feeding coil unit in FIG. FIG. 3 is a schematic perspective view showing a sensor and a sensor space of the feeding coil unit in FIG. The feeder coil unit according to the second embodiment of the present invention corresponding to the schematic perspective view showing the sensor and the sensor space of the feeder coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space from the vertically upward direction. The feeder coil unit according to the third embodiment of the present invention corresponding to the schematic perspective view showing the sensor and the sensor space of the feeder coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space from the vertically upward direction. The feeder coil unit according to the fourth embodiment of the present invention corresponding to the schematic perspective view showing the sensor and the sensor space of the feeder coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space from the vertically upward direction. The feeder coil unit according to the fifth embodiment of the present invention corresponding to the schematic perspective view showing the sensor and the sensor space of the feeder coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space from the vertically upward direction. It is a model perspective view which expands and shows the feed coil and the space for feed coils of the feed coil unit in the wireless power transmission device concerning a 6th embodiment of the present invention from the perpendicular lower part. It is a schematic cross section of the feeding coil unit which concerns on 6th Embodiment of this invention. It is a model perspective view which expands and shows the feeding coil and feeding coil space of the feeding coil unit in the wireless power transmission device according to the seventh embodiment of the present invention from vertically below. It is a model perspective view which expands and shows the feeding coil and feeding coil space of the feeding coil unit in the wireless power transmission device according to the eighth embodiment of the present invention from vertically below. It is the schematic which shows the wireless power transmission apparatus which concerns on 9th Embodiment of this invention with an electrical storage device. It is a schematic cross-sectional perspective view of the receiving coil unit in the wireless power transmission device according to the ninth embodiment of the present invention, corresponding to the schematic cross-sectional perspective view of the power feeding coil unit according to the first embodiment of the present invention shown in FIG. . It is the schematic which shows the wireless power transmission apparatus which concerns on 10th Embodiment of this invention with an electrical storage device. FIG. 4 is a schematic cross-sectional perspective view of the ground-side coil unit in the wireless power transmission device according to the tenth embodiment of the present invention, corresponding to the schematic cross-sectional perspective view of the power feeding coil unit according to the first embodiment of the present invention shown in FIG. 3. is there. It is a model perspective view which expands and shows another example of the sensor of a feeding coil unit, and the space for sensors from the vertical upper direction.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted. Further, the positional relationship such as up / down / left / right is relative and is not particularly limited, and up / down / left / right may be reversed. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. The following embodiments are examples for explaining the present invention, and the present invention is not limited only to the embodiments. The constituent elements described below can be combined as appropriate.

(First embodiment)
First, the wireless power transmission device S1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a wireless power transmission device according to a first embodiment of the present invention together with a capacitor.

  As shown in FIG. 1, the wireless power transmission device S <b> 1 includes a wireless power feeding device 100 and a wireless power receiving device 200. In the present embodiment, the wireless power transmission device S1 will be described using an example in which the wireless power transmission device S1 is applied to a power supply facility for a vehicle. That is, the wireless power feeding apparatus 100 is a power feeding facility installed on the ground, and the wireless power receiving apparatus 200 is a power receiving facility mounted on the vehicle. Examples of the vehicle to which the wireless power receiving apparatus 200 is applied include various vehicles such as an electric vehicle and a hybrid vehicle that use the power of the secondary battery.

  The wireless power supply apparatus 100 includes a power source VG, an inverter INV, and a power supply coil unit L1. The power source VG supplies DC power to an inverter INV described later. The power source VG is not particularly limited as long as it outputs DC power, and is a DC power source rectified and smoothed from a commercial AC power source, a secondary battery, a DC power source generated by photovoltaic power, or a switching power source device such as a switching converter. Is mentioned.

  The inverter INV has a function of converting input DC power supplied from the power supply VG into AC power. The inverter INV is composed of a switching circuit in which a plurality of switching elements are bridge-connected. Examples of the switching elements constituting the switching circuit include elements such as a MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor) and an IGBT (Insulated Gate Bipolar Transistor).

  The feeding coil unit L1 includes a feeding coil L11 and is packaged by a housing 600. The power supply coil L11 functions as a power supply unit that wirelessly transmits AC power supplied from the inverter INV to a power receiving coil L12 described later. In addition, when the wireless power transmission device S1 is applied to a power supply facility for a vehicle such as an electric vehicle, the power supply coil unit L1 is disposed in the ground or in the vicinity of the ground. A specific configuration of the feeding coil unit L1 will be described later.

  The wireless power receiving apparatus 200 includes a power receiving coil unit L2, a rectifier 230, and a charger 240.

  The power receiving coil unit L <b> 2 has a power receiving coil L <b> 12 and a magnetic shield material 220, and these are packaged by a housing 210. Here, the power receiving coil L12 functions as a power receiving unit that receives AC power wirelessly transmitted from the power feeding coil L11 of the wireless power feeding apparatus 100. When the wireless power transmission device S1 is applied to a power supply facility for a vehicle such as an electric vehicle, the power receiving coil unit L2 is mounted on the lower portion of the electric vehicle. Examples of the power receiving coil L12 include a coil in which a conducting wire is continuously wound, a coil formed by punching a plate material by pressing, and a coil formed by bending a thin plate material. Examples of the material of the conductive wire in the case where the power receiving coil L12 is configured by winding a conductive wire include copper, silver, gold, aluminum, or a metal wire containing these as constituent components. From the viewpoint of weight reduction, an aluminum wire, a copper clad aluminum wire, or the like may be used. From the viewpoint of achieving both weight reduction and electrical conductivity, a copper clad aluminum wire in which copper is uniformly coated around the aluminum wire is preferable. The copper clad aluminum wire is preferably used as a litz wire in which many wires are bundled and twisted. Further, when the power receiving coil L12 is formed into a coil shape by punching a plate material by pressing, or as a material of the plate material and the thin plate material when the thin plate material is bent and formed into a coil shape, copper, Silver, gold | metal | money, aluminum, or the alloy containing these as a structural component is mentioned.

  The magnetic shield material 220 has a role of eliminating or reducing leakage of a magnetic field generated during power supply / reception to the surroundings and the vehicle. Specifically, an eddy current is generated on the surface of the magnetic shield material 220 due to a magnetic field generated when the power feeding coil L11 and the power receiving coil L12 receive and receive power. Due to this eddy current, a magnetic field is generated on the magnetic shield material 220 in a direction in which the magnetic field generated at the time of power supply / reception is canceled, and the magnetic field generated when the power supply coil L11 and the power reception coil L12 are supplied / received leaks to the surroundings and the vehicle. To eliminate or reduce that. The magnetic shield material 220 is disposed on the back side of the power receiving coil L12, that is, on the vehicle side in the power receiving coil unit L2. Examples of the material of the magnetic shield material 220 include copper, silver, gold, aluminum, and metals containing these as constituent components. In particular, from the viewpoint of emphasizing cost, it is preferable to use aluminum that is relatively inexpensive and has low metal resistance. The power receiving coil unit L2 may include a magnetic body that enhances the coupling between the power receiving and power receiving coils between the power receiving coil L12 and the magnetic shield material 220.

  The rectifier 230 has a function of rectifying the AC power received by the power receiving coil L12 into DC power. As the rectifier 230, a bridge-type circuit in which a plurality of switching elements such as a half-wave rectifier circuit and a full-wave rectifier circuit are bridge-connected, and a parallel connection to the bridge-type circuit, and the rectified voltage is smoothed to obtain a DC voltage. It is comprised from the smoothing capacitor which produces | generates.

  The charger 240 charges the battery 250 with the DC power rectified by the rectifier 230. Specifically, the charger 240 includes a charge control circuit that controls the charging of the capacitor 250, converts the current and voltage of the DC power rectified by the rectifier 230, and supplies the electric power to the capacitor 250 to store electrical energy. To perform the operation. The capacitor 250 is not particularly limited as long as it has a function of storing electric power, and examples thereof include a secondary battery (such as a lithium ion battery, a lithium polymer battery, and a nickel metal hydride battery) and a capacitor element (such as an electric double layer capacitor). From the viewpoint of high energy density, a lithium ion battery is preferable. Note that the charger 240 is not an essential configuration, and the DC power output from the rectifier 230 may be directly supplied to the battery 250.

  By providing such a configuration, a wireless power transmission device S1 is realized in which power is wirelessly transmitted from the power feeding coil L11 of the wireless power feeding device 100 to the power receiving coil L12 of the wireless power receiving device 200.

  Next, the configuration of the feeding coil unit L1 in the wireless power transmission device S1 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a schematic perspective view showing a feeding coil unit in the wireless power transmission device according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional perspective view of the power feeding coil unit along II in FIG. FIG. 4 is a schematic perspective view showing a feeding coil and a feeding coil space of the feeding coil unit in FIG. FIG. 5 is a schematic perspective view showing a sensor and a sensor space of the feeding coil unit in FIG.

  As shown in FIGS. 2 and 3, the feeding coil unit L1 includes a housing 600, a magnetic body 720, a feeding coil L11, and a sensor 810. The power supply coil unit L1 wirelessly transmits power to the power receiving side.

  As shown in FIG. 2, the housing 600 has a rectangular parallelepiped outer shape. Examples of the material of the housing 600 include an insulating resin, such as acrylonitrile / butadiene / styrene copolymer (ABS), polybutylene terephthalate resin (PET), polyphenylene sulfide resin (PPS), reinforced fiber plastic (FRP), and the like. Is mentioned. The housing 600 may be composed of a plurality of members and materials. In particular, in order to eliminate or reduce the leakage of a magnetic field generated during power supply and reception to the surroundings and the vehicle, a part of the housing 600 (for example, the bottom portion 630 of the housing 600) is made of copper, silver, gold, aluminum. Or it is good also as a metal etc. which contain these as a structural component. From the viewpoint of emphasizing cost, it is preferable to use aluminum that is relatively inexpensive and has low metal resistance. The housing 600 is installed on the ground, but between the housing 600 and the ground, an insulator such as an insulating sheet or resin, a silicon thermal conductive sheet, a thermal conductive epoxy adhesive, a thermal conductive double-sided tape, or the like. A heat conductive material for improving heat dissipation, a member having a two-layer structure in which an insulator or a heat conductive material is stacked may be interposed. In the present embodiment, the outer shape of the housing 600 has a rectangular parallelepiped shape, but is not limited thereto, and various shapes such as a truncated cone shape, a truncated pyramid shape, a polygonal column shape, an anti-rectangular column shape, and a dome shape are included. May be present.

  In the present embodiment, the housing 600 accommodates the magnetic body 720, the feeding coil L11, and the sensor 810. Specifically, as illustrated in FIG. 3, the housing 600 includes a partition plate 620 that partitions a power feeding coil space 700 that houses the magnetic body 720 and the power feeding coil L <b> 11 and a sensor space 800 that houses the sensor 810. Have. The sensor space 800 is positioned vertically above the feeding coil space 700. That is, the sensor space 800 is located on the side where the power transmission of the power supply coil unit L1 is performed with respect to the power supply coil space 700. Further, the housing 600 has a support column 650 in the sensor space 800.

  As shown in FIGS. 3 and 4, the power supply coil space 700 is a rectangular parallelepiped space. Specifically, the power supply coil space 700 is a space defined by the bottom portion 630, the side surface portion 640, and the partition plate 620 of the housing 600. In the space within the power supply coil space 700, a power supply coil L11 and a magnetic body 720 are disposed. In the present embodiment, the space shape of the power supply coil space 700 has a rectangular parallelepiped shape, but is not limited to this, and there are various shapes such as a truncated cone shape, a truncated pyramid shape, a polygonal column shape, an anti-rectangular column shape, and a dome shape. May have a different shape.

  As shown in FIGS. 3 and 5, the sensor space 800 is a rectangular parallelepiped space. Specifically, the sensor space 800 is a space defined by the top portion 610, the side surface portion 640, and the partition plate 620 of the housing 600. A column 650 is provided in the space in the sensor space 800, and a sensor 810 is disposed. In the present embodiment, the space shape of the sensor space 800 has a rectangular parallelepiped shape, but is not limited to this, and there are various shapes such as a truncated cone shape, a truncated pyramid shape, a polygonal column shape, an anti-rectangular column shape, and a dome shape. It may have a shape.

  The column 650 plays a role of holding the internal space of the sensor space 800. Specifically, as shown in FIG. 5, the column 650 is a columnar column extending in the vertical direction from the partition plate 620 in the sensor space 800. Thereby, deformation of the internal space of the sensor space 800 due to the load applied to the housing 600 is suppressed. That is, the sensor space 800 is supported by the support column 650. Here, since the sensor space 800 is supported by the support 650, the thickness of the top portion 610 of the housing 600 (the outer wall portion of the housing 600 on the side on which the vehicle rides) can be reduced. Thereby, since the space | interval of the sensor 810 and the object which is a detection target approaches, the sensitivity of the sensor 810 can be improved. On the other hand, when the load resistance of the feeding coil unit L1 is insufficient by reducing the thickness of the top portion 610 of the housing 600, the thickness of the partition plate 620 between the feeding coil space 700 and the sensor space 800 is decreased. By increasing the thickness, it is possible to maintain or improve the load resistance of the feeding coil unit L1 while maintaining the distance between the sensor 810 and the object that is the detection target. That is, in order to ensure the load resistance of the feeding coil unit L1 while improving the sensitivity of the sensor 810, the thickness of the top portion 610 of the housing 600 is set to a thickness that can secure the sensitivity of the desired sensor 810, and this housing 600 This can be achieved by making the partition plate 620 of the housing 600 thicker than the thickness of the top portion 610. In this embodiment, the support column 650 has a cylindrical outer shape, but is not limited thereto, and has various shapes such as a truncated cone shape, a truncated pyramid shape, a polygonal column shape, and an anti-rectangular column shape. Also good. Further, in this embodiment, the support column 650 is provided so as to be positioned substantially at the center of the sensor space 800, but the present invention is not limited thereto, and may be provided at an arbitrary location. However, in order to improve the load resistance, it is preferable that the distance between the support column 650 and the side surface portion 640 of the housing 600 is maximized, that is, arranged in the center. Furthermore, in the present embodiment, the vertically upper end of the column 650 is in contact with the top 610 of the housing 600 in the sensor space 800. However, if the internal space of the sensor space 800 can be held, the housing A gap may be provided between the top portion 610 of the body 600.

  As shown in FIG. 4, the magnetic body 720 has a substantially square plate-like outer shape when viewed from the vertical direction, and is placed on the bottom portion 630 of the housing 600 in the feeding coil space 700. . That is, the magnetic body 720 is placed on the inner surface of the power supply coil space 700 on the side opposite to the power transmission side of the power supply coil unit L1 of the housing 600. The magnetic body 720 has an effect of reducing the magnetic resistance of the magnetic path and increasing the magnetic coupling between the coils. Examples of the material of the magnetic body 720 include sendust, MnZn ferrite, and permalloy. The magnetic permeability and electric resistance of the magnetic body 720 are preferably as high as possible. Among these, MnZn ferrite is particularly preferable. In this embodiment, the outer shape of the magnetic body 720 viewed from the vertical direction is substantially square, but is not limited thereto, and various shapes such as a rectangle, a polygon, a circle, and an ellipse are exhibited. Also good. Moreover, in this embodiment, although the magnetic body 720 is comprised as one member, it may be comprised from the piece of a some magnetic member, without being restricted to this. The shape of the individual pieces of the magnetic member may be a combination of various shapes. Furthermore, an insulating material such as an insulating sheet or a resin may be interposed between the magnetic body 720 and the bottom portion 630 of the housing 600 in the power feeding coil space 700.

  The power feeding coil L11 transmits the AC power supplied from the inverter INV to the power receiving coil L12. Specifically, when an AC voltage is applied from the inverter INV to the power supply coil L11, an AC current flows through the power supply coil L11 to generate an AC magnetic field, and power is transmitted to the power receiving coil L12 via this AC magnetic field. . As shown in FIG. 4, the power supply coil L <b> 11 is installed on the bottom portion 630 of the casing 600 in the power supply coil space 700 with the magnetic body 720 interposed therebetween. In other words, the power supply coil L11 is installed on the inner surface of the power supply coil space 700 opposite to the power transmission side of the power supply coil unit L1 of the housing 600 with the magnetic body 720 interposed therebetween. In the present embodiment, the power supply coil L11 is configured by continuously winding a conductive wire, but is not limited thereto, and is a plate-shaped one that is formed by punching a plate material by a press. A thin plate-like material may be bent and formed into a coil shape. In addition, examples of the coil type in which the conductive wire is continuously wound include a spiral coil, a solenoid coil, or a combination of these. Furthermore, as a coil type of a plate-like material formed by punching a plate material by a press and a coil-shaped material formed by bending a thin plate-like material, a spiral coil or a combination of these may be mentioned. . In the present embodiment, the feeding coil L11 is configured by winding a conductive wire continuously in a planar shape, and is disposed in the feeding coil space 700 so that the winding axis direction is substantially parallel to the vertical direction. Yes. Further, in the present embodiment, the feeding coil L11 has a circular outer shape when viewed from the vertical direction, but is not limited thereto, and has various outer shapes such as a rectangle, a polygon, and an ellipse. Also good. Still further, examples of the material of the conducting wire in the case where the feeding coil L11 is formed by winding a conducting wire include copper, silver, gold, aluminum, or a metal wire containing these as constituent components. From the viewpoint of weight reduction, an aluminum wire, a copper clad aluminum wire, or the like may be used. From the viewpoint of achieving both weight reduction and electrical conductivity, a copper clad aluminum wire in which copper is uniformly coated around the aluminum wire is preferable. The copper clad aluminum wire is preferably used as a litz wire in which many wires are bundled and twisted. On the other hand, when the feeding coil L11 is formed into a coil shape by punching a plate material by pressing, or as a material of the plate material and the thin plate material when the thin plate material is bent into a coil shape, , Silver, gold, aluminum, or an alloy containing these as constituent components. Here, between the feeding coil L11 and the magnetic body 720, a bobbin (not shown) plays a role of winding and fixing the feeding coil L11 around the coil core and / or insulating the feeding coil L11 and the magnetic body 720. ) May be provided. The bobbin is preferably made of an insulating resin such as acrylonitrile / butadiene / styrene copolymer (ABS), polybutylene terephthalate resin (PET), polyphenylene sulfide resin (PPS), reinforced fiber plastic (FRP), and the like. It is done.

  The sensor 810 detects an object that exists above or around the feeding coil unit L1. Specifically, the sensor 810 includes a living body detection sensor that detects a living body around the power feeding coil unit L1, a position detection sensor that detects a vehicle on which the wireless power receiving apparatus 200 is mounted, and prevents a power supply power receiving position shift, and a power feeding coil. Examples thereof include a metal detection coil that detects that a metal foreign object has entered between the unit L1 and the power receiving coil unit L2. Information detected by the sensor 810 is sent to various devices such as a vehicle, a power supply VG, and an inverter INV, and power transmission according to the surrounding conditions of the feeding coil unit L1 is possible. In the present embodiment, the sensor 810 is a metal detection coil, and is composed of a ring-shaped coil. That is, the metal detection coil as the sensor 810 is an air-core coil having a hole penetrating in the vertical direction. Here, the function of the metal detection coil as the sensor 810 will be described in detail. The metal detection coil detects that a metal foreign object is mixed between the feeding coil unit L1 and the receiving coil unit L2. Specifically, a change in increase / decrease in magnetic flux caused by a metal foreign matter mixed between the feeding coil unit L1 and the receiving coil unit L2 is detected by the metal detection coil. When a metal foreign object enters the range affected by the magnetic field generated by the power supply coil unit L1, a warning or power supply stop is immediately urged by an electrical signal detected by the metal detection coil. In the present embodiment, the metal detection coil is composed of a ring-shaped coil. However, as long as metal foreign matter can be detected, there is no particular limitation on the material and shape. May be continuously wound into a spiral structure, or may be formed into a coil shape by punching a plate material with a press. However, from the viewpoint of cost, a printed coil that can manufacture a large number of coils on the same substrate and has a high production speed is preferable. In the case where the sensor 810 is formed of a printed coil, a substrate on which a printed coil conductive pattern is printed may be used as the partition plate 620.

  In the present embodiment, the sensor 810 is disposed on the partition plate 620 of the housing 600 in the sensor space 800. The sensor 810 can be placed at any position in the sensor space 800 as long as it is on the partition plate 620 of the housing 600. The sensor 810 is arranged on the partition plate 620 in a non-contact manner with the upper inner surface of the housing 600 (the inner surface of the top 610 of the housing 600) in the sensor space 800. That is, in the sensor space 800, a gap is secured between the sensor 810 and the top portion 610 of the housing 600. In other words, in the sensor space 800, a gap is secured between the sensor 810 and the inner surface portion of the casing 600 on which the vehicle rides. Due to this gap, external stresses such as impact and load when the vehicle gets on are not directly transmitted, and the transmission of stress to the sensor 810 can be suppressed. Here, in the case where a gap is provided between the vertically upper end of the column 650 and the top 610 of the housing 600, the gap between the vertically upper end of the column 650 and the top 610 of the housing 600 is a sensor. It is preferable that the gap is set smaller than the gap between 810 and the top portion 610 of the housing 600. Furthermore, it is preferable that the sensor 810 be disposed in a non-contact manner with the side surface portion 640 of the housing 600 in the sensor space 800. In this case, the transmission of stress to the sensor 810 can be further suppressed. In the present embodiment, the outer shape of the sensor 810 is a ring-shaped coil, but is not limited thereto, and may be various shapes.

  As described above, in the wireless power transmission device S1 according to the present embodiment, in the feeding coil unit L1, the casing 600 is vertically above the feeding coil space 700 that houses the feeding coil L11 and the feeding coil space 700. And a partition plate 620 that divides the sensor space 800 to accommodate the sensor space 810 and at least one support column 650 that holds the internal space of the sensor space 800. On the partition plate 620, it arrange | positions in the non-contact with the upper inner surface part of the housing | casing 600. FIG. Therefore, since the sensor space 800 is supported by the support column 650, the load resistance of the feeding coil unit L1 can be ensured. Further, in the sensor space 800, since a gap is secured between the inner surface of the housing 600 on the side where the vehicle rides and the sensor 810, external stress such as impact and load when the vehicle rides is directly applied. Transmission to the sensor 810 is suppressed. Therefore, it is possible to prevent the stress from being transmitted to the sensor 810 installed inside the feeding coil unit L1 when an external stress is applied while securing the load resistance of the feeding coil unit L1.

(Second Embodiment)
Next, a wireless power transmission device according to the second embodiment of the present invention will be described with reference to FIG. FIG. 6 corresponds to a schematic perspective view showing the sensor and the sensor space of the feeding coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space of the electric power feeding coil unit which concern from the perpendicular upper direction. The wireless power transmission device according to the second embodiment is different from the first embodiment in terms of the shape and arrangement of the sensor 810 in the sensor space 800 of the feeding coil unit L1, and the other configurations are related to the first embodiment. This is the same as the wireless power transmission device S1. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 6, in this embodiment, the sensor 810 has a hole penetrating in the vertical direction. The sensor 810 is arranged so that the support column 650 extends through the hole of the sensor 810. That is, the column 650 extends in the vertical direction from the partition plate 620 through the hole of the sensor 810 in the sensor space 800. Therefore, since the column 650 that plays a role of holding the internal space of the sensor 810 and the sensor space 800 is close to the sensor 810, the internal space around the sensor 810 of the sensor space 800 is held. By maintaining this internal space, external stresses such as impact and load when the vehicle gets on are not directly transmitted, and the transmission of stress to the sensor 810 can be further suppressed. Furthermore, it is preferable that the sensor 810 is disposed in a non-contact manner with the support column 650. In this case, the transmission of stress to the sensor 810 can be further suppressed. In the present embodiment, the sensor 810 has a ring-shaped coil, but is not limited thereto, and may have various shapes. When the sensor 810 is a ring-shaped coil, since the hole of the sensor 810 is originally present, the space in the sensor space 800 can be effectively used.

  As described above, in the wireless power transmission device according to the present embodiment, in the feeding coil unit L1, the sensor 810 has a hole penetrating in the vertical direction, and the support column 650 penetrates the hole of the sensor 810 in the vertical direction. It extends to. Therefore, the internal space around the sensor 810 in the sensor space 800 is maintained. By maintaining this internal space, external stresses such as impact and load when the vehicle gets on are not directly transmitted, and the transmission of stress to the sensor 810 can be further suppressed.

(Third embodiment)
Next, a wireless power transmission device according to the third embodiment of the present invention will be described with reference to FIG. FIG. 7 corresponds to a schematic perspective view showing the sensor and the sensor space of the feeding coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space of the electric power feeding coil unit which concern from the perpendicular upper direction. The wireless power transmission device according to the third embodiment is different from the first embodiment in that the feeding coil unit L1 includes a plurality of sensors 810. Other configurations are the same as those of the wireless power transmission device S1 according to the first embodiment. It is the same. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 7, in the present embodiment, the feeding coil unit L <b> 1 has a plurality of sensors 810. The positions of the plurality of sensors 810 can be arranged at arbitrary positions in the sensor space 800 as long as they are on the partition plate 620 of the housing 600. Compared with the case where one sensor 810 is provided, in the case where a plurality of sensors 810 are provided, the ratio of the area where the sensor 810 is present to the housing 600 is increased. Therefore, an area where an object can be detected by the sensor 810 can be widened. Note that, as described above in the second embodiment, as shown in FIG. 7, the column 650 may be disposed so that the column 650 penetrates a hole of an arbitrary sensor 810 among the plurality of sensors 810. In the present embodiment, each of the plurality of sensors 810 has a ring-shaped coil having a hole penetrating in the vertical direction, and one sensor arranged so that the pillar 650 penetrates the hole, and the pillar 650 It is composed of a total of five sensors of four sensors arranged around. The plurality of sensors 810 are arranged apart from each other on the partition plate 620. Here, in the case where the sensor 810 is a metal detection coil, it is preferable that the sensor 810 is composed of a sensor 810 spread so as to cover a region where the magnetic flux generated by the feeding coil L11 is linked. Thereby, the area where metal foreign matter cannot be detected can be reduced, and the metallic foreign matter mixed between the feeding coil unit L1 and the receiving coil unit L2 can be reliably detected.

  As described above, the wireless power transmission device according to the present embodiment includes a plurality of sensors 810 in the feeding coil unit L1. Therefore, in the case where a plurality of sensors 810 are provided, the ratio of the area where the sensors 810 are present to the housing 600 is increased compared to the case where one sensor 810 is provided. That is, an area where an object can be detected by the sensor 810 can be widened.

(Fourth embodiment)
Next, a wireless power transmission device according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 corresponds to a schematic perspective view showing the sensor and the sensor space of the feeding coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space of the electric power feeding coil unit which concern from the perpendicular upper direction. The wireless power transmission device according to the fourth embodiment is different from the first embodiment in that the casing 600 includes a plurality of support columns 650 in the feeding coil unit L1, and the other configuration is the wireless power according to the first embodiment. This is the same as the transmission device S1. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 8, in the present embodiment, the casing 600 includes a plurality of support columns 650 in the power feeding coil unit L1. Since the housing 600 includes a plurality of support columns 650, a plurality of locations support the load applied to the housing 600, and thus external stress can be dispersed. Therefore, the load resistance of the power feeding coil unit L1 can be further ensured. Note that the positions of the plurality of columns 650 can be arranged at arbitrary positions in the sensor space 800. In particular, in order to improve load resistance, it is preferable that the distance between the plurality of support columns 650 and the side surface portion 640 of the housing 600 be equal and maximized. The plurality of support columns 650 may have different sizes or the same size. In the present embodiment, among the plurality of support columns 650, the size of the support column 650 located at the approximate center in the sensor space 800 is the largest. In this case, it is possible to reliably ensure the load resistance at the central portion of the housing 600 that is most susceptible to deformation due to the load.

  As described above, in the wireless power transmission device according to the present embodiment, the casing 600 includes a plurality of columns 650 in the feeding coil unit L1. Therefore, since the location which supports the load applied to the housing 600 is a plurality of locations, external stress can be dispersed.

(Fifth embodiment)
Next, a wireless power transmission device according to the fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 corresponds to a schematic perspective view showing the sensor and the sensor space of the feeding coil unit according to the first embodiment of the present invention shown in FIG. It is a model perspective view which expands and shows the sensor and sensor space of the electric power feeding coil unit which concern from the perpendicular upper direction. The wireless power transmission device according to the fifth embodiment is different from the first embodiment in that the power supply coil unit L1 includes a plurality of sensors 810 and the housing 600 includes a plurality of support columns 650. This is the same as the wireless power transmission device S1 according to the embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 9, in the present embodiment, the feeding coil unit L1 has a plurality of sensors 810, and the housing 600 has a plurality of columns 650. Thereby, the area where an object can be detected by the sensor 810 can be widened, and the load resistance of the feeding coil unit L1 can be further ensured. The positions of the plurality of sensors 810 and the positions of the plurality of columns 650 can be arranged at arbitrary positions in the sensor space 800.

  In the present embodiment, each of the plurality of sensors 810 has a ring-shaped coil having a hole penetrating in the vertical direction, and each of the plurality of support columns 650 passes through the holes of the plurality of sensors 810 in the vertical direction. It extends. Although not shown, the plurality of sensors 810 do not necessarily have to be arranged so that the pillars 650 penetrate the holes of the sensors 810, and the sensors 810 arranged so that the pillars 650 penetrate the holes, Both of the sensors 810 may be included so that the column 650 does not pass through. Note that the numbers of the plurality of sensors 810 and the plurality of support columns 650 do not have to be the same, and are set as appropriate based on the detection area and load resistance of the object.

  As described above, the wireless power transmission device according to the present embodiment includes a plurality of sensors 810 in the feeding coil unit L1. Therefore, in the case where a plurality of sensors 810 are provided, the ratio of the area where the sensors 810 are present to the housing 600 is increased compared to the case where one sensor 810 is provided. That is, an area where an object can be detected by the sensor 810 can be widened.

  In the wireless power transmission device according to the present embodiment, the casing 600 includes a plurality of support columns 650 in the feeding coil unit L1. Therefore, since the location which supports the load applied to the housing 600 is a plurality of locations, external stress can be dispersed.

(Sixth embodiment)
Next, with reference to FIG.10 and FIG.11, the wireless power transmission apparatus which concerns on 6th Embodiment of this invention is demonstrated. FIG. 10 is a schematic perspective view showing the feeding coil and the feeding coil space of the feeding coil unit in the wireless power transmission device according to the sixth embodiment of the present invention, as enlarged from the vertically lower side. FIG. 11 is a schematic cross-sectional view of a feeding coil unit according to the sixth embodiment of the present invention. The wireless power transmission device according to the sixth embodiment is different from the first embodiment in that the casing 600 has a protrusion 660 in the feeding coil unit L1, and the other configuration is the wireless power according to the first embodiment. This is the same as the transmission device S1. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIGS. 10 and 11, in this embodiment, the housing 600 has a protrusion 660 that extends vertically downward from the partition plate 620 in the power supply coil space 700. Thereby, the thickness of the partition plate 620 can be increased by the height of the projection 660 in the portion where the projection 660 and the partition plate 620 are connected. That is, the thickness of the partition plate 620 that supports the load from the column 650 can be increased by the height of the protrusion 660 with respect to the external stress applied to the housing 600. Therefore, the load resistance of the power feeding coil unit L1 can be improved. In the present embodiment, the protrusion 660 extends so as to penetrate the air core portion of the feeding coil L11. In other words, the conducting coil L11 is wound with a conductive wire with the protrusion 660 as the central axis. In the present embodiment, the protrusion 660 has a cylindrical outer shape, but is not limited thereto, and has various shapes such as a truncated cone shape, a truncated pyramid shape, a polygonal column shape, and an anti-rectangular column shape. It may be. Furthermore, in the present embodiment, the protrusion 660 is provided so as to be positioned approximately at the center of the power supply coil space 700, but the present invention is not limited thereto, and may be provided at an arbitrary location. However, in order to improve the load resistance, it is preferable that the distance between the protrusion 660 and the side surface 640 of the housing 600 is maximized, that is, the center is disposed. Furthermore, in the present embodiment, a gap is provided between the vertically lower end of the protrusion 660 and the magnetic body 720 in the power supply coil space 700. From the viewpoint of load resistance, the protrusion 660 is preferably as high as possible. The magnetic body 720 is provided with an opening through which the protrusion 660 can pass, and the protrusion 660 extends through the opening of the magnetic body 720. You may comprise as follows. At this time, if the vertically lower end portion of the protrusion 660 is configured to contact the bottom portion 630 of the housing 600, it is possible to suppress external stress such as impact and load when the vehicle rides on from the magnetic body 720 directly. Is done. Therefore, the load resistance of the power feeding coil unit L1 can be further ensured.

  As described above, in the wireless power transmission device according to the present embodiment, in the feeding coil unit L1, the housing 600 has the protrusion 660 when extending vertically downward from the partition plate 620 in the feeding coil space 700. Therefore, the thickness of the partition plate 620 that supports the load from the support column 650 can be increased by the height of the protrusion 660 against the external stress applied to the housing 600, and the load resistance of the power feeding coil unit L1 can be increased. Can be improved.

(Seventh embodiment)
Next, a wireless power transmission device according to the seventh embodiment of the present invention will be described with reference to FIG. FIG. 12 is a schematic perspective view showing the feeding coil and the feeding coil space of the feeding coil unit in the wireless power transmission device according to the seventh embodiment of the present invention, as enlarged from the vertically lower side. The wireless power transmission device according to the seventh embodiment is different from the sixth embodiment in the shape of the protrusion 660 of the housing 600 in the power feeding coil unit, and other configurations are the same as those in the sixth embodiment. . Hereinafter, a description will be given centering on differences from the sixth embodiment.

  As shown in FIG. 12, in this embodiment, the protrusion 660 has a hollow cylindrical shape. Thereby, a small component (not shown) such as an electronic component can be installed in the middle space of the protrusion 660, and the space can be effectively used in the power supply coil space 700. For example, a small component such as an electronic component is attached to the partition plate 620 in the middle space of the protrusion 660. Also in this embodiment, similarly to the sixth embodiment, the magnetic body 720 may be provided with an opening through which the protrusion 660 can pass, and the protrusion 660 may extend through the opening of the magnetic body 720. . At this time, a small component such as an electronic component may be attached to the partition plate 620 in the middle space of the protrusion 660 so that a part of the small component such as an electronic component is located in the middle space of the protrusion 660. It may be attached to the bottom 630 of the housing 600. Also. The projecting portion 660 may be configured such that the vertically lower end thereof is in contact with the bottom portion 630 of the housing 600, so that there is a gap between the vertically lower end portion of the projecting portion 660 and the bottom portion 630 of the housing 600. You may comprise. When there is a gap between the vertically lower end of the protrusion 660 and the bottom 630 of the housing 600, wiring of a small component such as an electronic component installed in the middle space of the protrusion 660 is facilitated.

  As described above, in the wireless power transmission device according to the present embodiment, the protrusion 660 has a hollow cylindrical shape in the feeding coil unit L1. Therefore, small parts such as electronic parts can be installed between the hollows, and the space can be effectively used.

(Eighth embodiment)
Next, a wireless power transmission device according to the eighth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a schematic perspective view showing the feeding coil and the feeding coil space of the feeding coil unit in the wireless power transmission device according to the eighth embodiment of the present invention, as enlarged from the vertically lower side. The wireless power transmission device according to the eighth embodiment is different from the sixth embodiment in the structure of the feeding coil L11 in the feeding coil unit, and other configurations are the same as those in the sixth embodiment. Hereinafter, a description will be given centering on differences from the sixth embodiment.

  As shown in FIG. 13, in this embodiment, the feeding coil L <b> 11 is wound with a conductive wire with the protrusion 660 as the central axis, and the inner peripheral edge of the feeding coil L <b> 11 is in contact with the protrusion 660. Yes. That is, the conducting wire located on the innermost side of the feeding coil L11 is in contact with the protrusion 660. Thereby, the heat radiation area is increased, and heat generated from the feeding coil L11 can be efficiently radiated to the outside through the housing 600 during power transmission. Therefore, the heat dissipation of the feeding coil unit L1 can be improved.

  As described above, in the wireless power transmission device according to this embodiment, in the power feeding coil unit L1, the power feeding coil L11 is wound with the inner peripheral edge in contact with the protrusion 660. Thereby, since the protrusion 660 and the power feeding coil L11 are in contact with each other, the heat radiation area is increased, and the heat generated from the power feeding coil L11 is efficiently radiated to the outside through the housing 600. Therefore, the heat dissipation of the feeding coil unit L1 can be improved.

(Ninth embodiment)
Next, with reference to FIG.14 and FIG.15, wireless power transmission apparatus S2 which concerns on 9th Embodiment of this invention is demonstrated. FIG. 14 is a schematic diagram showing a wireless power transmission device according to a ninth embodiment of the present invention together with a capacitor. 15 corresponds to the schematic cross-sectional perspective view of the power feeding coil unit according to the first embodiment of the present invention shown in FIG. 3, and the schematic cross section of the power receiving coil unit in the wireless power transmission device according to the ninth embodiment of the present invention. It is a perspective view.

  As illustrated in FIG. 14, the wireless power transmission device S2 includes a wireless power feeding device 101 and a wireless power receiving device 201. In the present embodiment, the wireless power transmission device S2 will be described using an example in which the wireless power transmission device S2 is applied to a power supply facility from a vehicle. That is, the wireless power supply apparatus 101 is a power supply facility mounted on the vehicle, and the wireless power reception apparatus 201 is a power reception facility installed on the ground. The wireless power transmission device S2 according to the ninth embodiment includes a feeding coil L11 of the feeding coil unit L1 installed on the ground side in the first embodiment and a receiving coil unit L2 mounted on the vehicle side in the first embodiment. The power receiving coil L12 has a reverse configuration. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The wireless power supply apparatus 101 includes an inverter INV2 and a power supply coil unit L3. The inverter INV2 is connected to a battery 251 mounted on the vehicle, and converts input DC power supplied from the battery 251 into AC power. Like the inverter INV of the first embodiment, the inverter INV2 is configured by a switching circuit in which a plurality of switching elements are bridge-connected. Examples of the switching elements that constitute the switching circuit include elements such as MOS-FETs and IGBTs. Is mentioned. The capacitor 251 is not particularly limited as long as it has a function of storing electric power, and examples thereof include a secondary battery (such as a lithium ion battery, a lithium polymer battery, and a nickel metal hydride battery) and a capacitor element (such as an electric double layer capacitor). From the viewpoint of high energy density, a lithium ion battery is preferable.

  The feeding coil unit L3 includes a feeding coil L11 and a magnetic shield material 220, which are packaged by a casing 210. This power supply coil unit L3 has the same configuration as the power reception coil unit L2 of the first embodiment except that it has a power supply coil L11 instead of the power reception coil L12. That is, in the present embodiment, the feeding coil unit L3 is mounted on the lower part of the electric vehicle, and the feeding coil L11 transmits the AC power supplied from the inverter INV2 to the receiving coil L12.

  The wireless power receiving apparatus 201 includes a power receiving coil unit L4, a rectifier 230, and a charger 240. Since the rectifier 230 and the charger 240 have the same configuration as that of the first embodiment except that they are provided on the ground, description thereof is omitted.

  As illustrated in FIG. 15, the power receiving coil unit L4 includes a housing 600, a magnetic body 720, a power receiving coil L12, and a sensor 810. The power receiving coil unit L4 includes a power receiving coil L12 instead of the power feeding coil L11, and the housing 600 replaces the power feeding coil space 700 with a power receiving coil space 900 that houses the magnetic body 720 and the power receiving coil L12. Except having, it is the structure similar to the feed coil unit L1 of 1st Embodiment. That is, in the present embodiment, the power receiving coil unit L4 is provided on the ground side, and the power receiving coil space 900 is a space defined by the bottom portion 630, the side surface portion 640, and the partition plate 620 of the housing 600, and the power receiving coil L12. Is installed on the bottom 630 of the housing 600 with the magnetic material 720 interposed therebetween, and the power receiving coil L12 receives AC power transmitted wirelessly from the power feeding coil L11.

  By providing such a configuration, a wireless power transmission device S2 that wirelessly transmits power from the power feeding coil L11 of the wireless power feeding device 101 to the power receiving coil L12 of the wireless power receiving device 201 is realized, and the power receiving coil L12 receives power. The AC power is rectified to DC power by the rectifier 230, and the DC power is charged by the charger 240 to the battery 260 installed on the ground side. That is, in this embodiment, power transmission is performed from the vehicle side toward the ground side. The capacitor 260 is not particularly limited as long as it has a function of storing electric power, and examples thereof include a secondary battery (such as a lithium ion battery, a lithium polymer battery, and a nickel metal hydride battery) and a capacitor element (such as an electric double layer capacitor). .

  As described above, in the wireless power transmission device S2 according to the present embodiment, in the power receiving coil unit L4, the housing 600 is vertically above the power receiving coil space 900 that houses the power receiving coil L12 and the power receiving coil space 900. And a partition plate 620 that divides the sensor space 800 to accommodate the sensor space 810 and at least one support column 650 that holds the internal space of the sensor space 800. On the partition plate 620, it arrange | positions in the non-contact with the upper inner surface part of the housing | casing 600. FIG. Therefore, since the sensor space 800 is supported by the support column 650, the load resistance of the power receiving coil unit L4 can be ensured. Further, in the sensor space 800, since a gap is secured between the inner surface of the housing 600 on the side where the vehicle rides and the sensor 810, external stress such as impact and load when the vehicle rides is directly applied. Transmission to the sensor 810 is suppressed. Therefore, it is possible to prevent stress from being transmitted to the sensor 810 installed inside the power receiving coil unit L4 when external stress is applied while securing the load resistance of the power receiving coil unit L4.

(10th Embodiment)
Next, with reference to FIG.16 and FIG.17, wireless power transmission apparatus S3 which concerns on 10th Embodiment of this invention is demonstrated. FIG. 16 is a schematic diagram showing a wireless power transmission device according to a tenth embodiment of the present invention together with a capacitor. FIG. 17 is a schematic cross-sectional perspective view of the power feeding coil unit according to the first embodiment of the present invention shown in FIG. 3, and a schematic diagram of the ground-side coil unit in the wireless power transmission device according to the tenth embodiment of the present invention. It is a cross-sectional perspective view.

  As shown in FIG. 16, the wireless power transmission device S <b> 3 includes a ground-side power supply device 300 and a vehicle-side power supply device 400. In the present embodiment, the ground-side power supply device 300 is installed on the ground, the vehicle-side power supply device 400 is mounted on the vehicle, and wireless power is supplied between the ground-side power supply device 300 and the vehicle-side power supply device 400. Is exchanged. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The ground-side power supply device 300 includes a first power converter 310 and a ground-side coil unit L5. The first power converter 310 is a bidirectional switching circuit. The first power converter 310 is connected to a commercial power source, converts the AC power supplied from the commercial power source into AC power for transmission, and outputs it to the ground side coil unit L5. And a second operation mode in which AC power supplied from the ground side coil unit L5 is connected to the provided battery 261 and converted to charging DC power and output to the battery 261. Note that the first operation mode may be an operation that is connected to a power storage unit 261 provided on the ground side instead of the commercial power source and converts DC power supplied from the power storage unit 261 into AC power for transmission. .

  As shown in FIG. 17, the ground side coil unit L5 includes a housing 600, a magnetic body 720, a ground side coil L51, and a sensor 810. The ground side coil unit L5 has a ground side coil L51 instead of the power supply coil L11, and the housing 600 replaces the power supply coil space 700 and houses the magnetic body 720 and the ground side coil L51. The configuration is the same as that of the feeding coil unit L1 of the first embodiment except that the space 500 is used. That is, in this embodiment, the ground side coil unit L5 is provided on the ground side, and the ground side coil space 500 is a space defined by the bottom portion 630, the side surface portion 640, and the partition plate 620 of the housing 600.

  The ground-side coil L51 functions as a power feeding unit that wirelessly transmits the AC power supplied from the first power converter 310 to the vehicle-side coil L61, and the AC power that is wirelessly transmitted from the vehicle-side coil L61. It has a function as a power receiving unit that receives power. Specifically, when AC power is transmitted wirelessly, an AC voltage is applied from the first power converter 310 to the ground-side coil L51, whereby an AC current flows through the ground-side coil L51 and an AC magnetic field. Is generated, and electric power is transmitted to the vehicle-side coil L61 via this AC magnetic field. On the other hand, when AC power is received wirelessly, an AC electromotive force is generated in the ground side coil L51 by receiving an AC magnetic field generated by the vehicle side coil L61, and the AC current based on the AC electromotive force is generated on the ground side. It flows to the coil L51. That is, the ground side coil L51 is a coil that exchanges AC power through a magnetic field. The ground side coil L51 is installed on the bottom portion 630 of the housing 600 with the magnetic body 720 interposed therebetween in the ground side coil space 500, like the power feeding coil L11. That is, in the ground side coil space 500, the ground side coil L51 is installed on the inner surface of the casing 600 opposite to the side where power is transmitted from the ground side coil unit L5 with the magnetic body 720 interposed therebetween. ing.

  The ground side coil L51 may be configured by winding a conducting wire continuously, or may be a plate-like one formed by punching a plate material by pressing to form a coil-like material. It may be bent and formed in a coil shape. In addition, examples of the coil type in which the conductive wire is continuously wound include a spiral coil, a solenoid coil, or a combination of these. Furthermore, as a coil type of a plate-like material formed by punching a plate material by a press and a coil-shaped material formed by bending a thin plate-like material, a spiral coil or a combination of these may be mentioned. . Furthermore, the ground side coil L51 is arranged in the ground side coil space 500 so that the winding axis direction is substantially parallel to the vertical direction when the conductive wire is continuously wound in a planar shape. The outer shape may be various shapes such as a circle, a rectangle, a polygon, and an ellipse as viewed from the vertical direction. In addition, as a material of the conducting wire in the case where the ground side coil L51 is formed by winding a conducting wire, copper, silver, gold, aluminum, or a metal wire containing these as a constituent component may be mentioned. From the viewpoint of weight reduction, an aluminum wire, a copper clad aluminum wire, or the like may be used. From the viewpoint of achieving both weight reduction and electrical conductivity, a copper clad aluminum wire in which copper is uniformly coated around the aluminum wire is preferable. The copper clad aluminum wire is preferably used as a litz wire in which many wires are bundled and twisted. On the other hand, when the ground side coil L51 is formed into a coil shape by punching a plate material by pressing, or as a material of the plate material and the thin plate material when the thin plate material is bent and formed into a coil shape, Examples thereof include copper, silver, gold, aluminum, and alloys containing these as constituent components. Here, between the ground side coil L51 and the magnetic body 720, a bobbin that plays the role of winding the ground side coil L51 around the coil core and / or insulating the ground side coil L51 and the magnetic body 720. (Not shown) may be provided. The bobbin is preferably made of an insulating resin such as acrylonitrile / butadiene / styrene copolymer (ABS), polybutylene terephthalate resin (PET), polyphenylene sulfide resin (PPS), reinforced fiber plastic (FRP), and the like. It is done.

  The vehicle-side power supply device 400 includes a vehicle-side coil unit L6 and a second power converter 410.

  The vehicle-side coil unit L6 includes a vehicle-side coil L61 and a magnetic shield material 220, which are packaged by a casing 210. The vehicle side coil unit L6 has the same configuration as the power receiving coil unit L2 of the first embodiment except that it has a vehicle side coil L61 instead of the power receiving coil L12. That is, in this embodiment, the vehicle side coil unit L6 is mounted on the lower part of the vehicle.

  The vehicle-side coil L61 has a function of wirelessly transmitting AC power supplied from the second power converter 410 to the ground-side coil L51, and a function of receiving AC power wirelessly transmitted from the ground-side coil L51. Have Specifically, when AC power is transmitted wirelessly, an AC voltage is applied to the vehicle side coil L61 from the second power converter 410, so that an AC current flows through the vehicle side coil L61 and an AC magnetic field. Is generated, and electric power is transmitted to the ground coil L51 via this AC magnetic field. On the other hand, when AC power is received wirelessly, an AC electromotive force is generated in the vehicle side coil L61 by receiving an AC magnetic field generated by the ground side coil L51, and the AC current based on the AC electromotive force is generated on the vehicle side. It flows through the coil L61. That is, the vehicle-side coil L61 is a coil that exchanges AC power via a magnetic field. Examples of the vehicle-side coil L61 include those in which a conductive wire is continuously wound, those obtained by punching a plate material by pressing, and those formed in a coil shape by bending a thin plate material. It is done. Examples of the material of the conductive wire when the vehicle-side coil L61 is configured by winding a conductive wire include copper, silver, gold, aluminum, or a metal wire containing these as constituent components. From the viewpoint of weight reduction, an aluminum wire, a copper clad aluminum wire, or the like may be used. From the viewpoint of achieving both weight reduction and electrical conductivity, a copper clad aluminum wire in which copper is uniformly coated around the aluminum wire is preferable. The copper clad aluminum wire is preferably used as a litz wire in which many wires are bundled and twisted. In addition, when the vehicle-side coil L61 is formed into a coil shape by punching a plate material by pressing, or as a material of the plate material and the thin plate material when the thin plate material is bent and formed into a coil shape, , Silver, gold, aluminum, or an alloy containing these as constituent components.

  The second power converter 410 is a bidirectional switching circuit. The second power converter 410 is mounted on the vehicle, with a first operation mode for converting the AC power supplied from the vehicle-side coil L61 into DC power for charging and outputting it to the battery 252 mounted on the vehicle. And a second operation mode in which DC power supplied from the battery 252 is converted into AC power for transmission and output to the vehicle side coil L61. Examples of the battery 252 mounted on the vehicle include a secondary battery (such as a lithium ion battery, a lithium polymer battery, and a nickel metal hydride battery) and a capacitor element (such as an electric double layer capacitor).

  By providing such a configuration, a wireless power transmission device S3 that realizes wireless power transfer between the ground-side power supply device 300 and the vehicle-side power supply device 400 is realized.

  As described above, in the wireless power transmission device S3 according to the present embodiment, in the ground side coil unit L5, the housing 600 includes the ground side coil space 500 that houses the ground side coil L51 and the ground side coil space 500. Also includes a partition plate 620 that is positioned vertically above and divides the sensor space 800 that houses the sensor 810, and at least one column 650 that holds the internal space of the sensor space 800. In the space 800, it is disposed on the partition plate 620 in a non-contact manner with the upper inner surface portion of the housing 600. Therefore, since the sensor space 800 is supported by the support column 650, the load resistance of the ground side coil unit L5 can be ensured. Further, in the sensor space 800, since a gap is secured between the inner surface of the housing 600 on the side where the vehicle rides and the sensor 810, external stress such as impact and load when the vehicle rides is directly applied. Transmission to the sensor 810 is suppressed. Therefore, it is possible to prevent the stress from being transmitted to the sensor 810 installed inside the ground side coil unit L5 when external stress is applied while securing the load resistance of the ground side coil unit L5.

  In the wireless power transmission device S3 according to the present embodiment, a ground-side power supply device in which power is transferred wirelessly between the vehicle-side power supply device 400 mounted on the vehicle and the vehicle-side power supply device 400. 300, and the ground-side power supply device 300 includes a ground-side coil unit L5 including a ground-side coil L51 that is a coil that exchanges AC power via a magnetic field. Therefore, bidirectional wireless power transmission that suppresses the transmission of stress to the sensor 810 installed inside the ground side coil unit L5 when external stress is applied while ensuring the load resistance of the ground side coil unit L5. Device S3 can be obtained.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made.

  For example, in the ninth and tenth embodiments, the configurations of the sensor 810 and the housing 600 have been described as being the same as those in the first embodiment, but the present invention is not limited thereto, and the configurations of the second to seventh embodiments are not limited thereto. The configurations of the sensor 810 and the housing 600 may be applied. Moreover, you may apply the characteristic structure of the electric power feeding coil L11 of 8th Embodiment to each of the receiving coil L12 of 9th Embodiment, and the ground side coil L51 of 10th Embodiment.

  Furthermore, although the fifth embodiment has been described using an example in which the plurality of sensors 810 are configured by ring-shaped coils, the present invention is not limited thereto, and may be configured by printed coils. Here, with reference to FIG. 18, the case where the some sensor 810 is comprised with the printed coil is demonstrated. As shown in FIG. 18, the plurality of sensors 810 are configured by printing a printed coil conductor pattern on a substrate. The print coils constituting the plurality of sensors 810 are formed in a matrix on the substrate. In this example, a total of 25 print coils of 5 rows and 5 columns are formed. In the substrate, a hole penetrating in the vertical direction is formed at the center of each printed coil, and a plurality of support columns 650 extend through the holes in the vertical direction. Also in this example, as in the fifth embodiment, an area where an object can be detected by the sensor 810 can be widened.

  The power supply coil unit according to the present invention can be applied to a moving body such as an automatic guided vehicle in addition to an electric vehicle.

  S1, S2, S3 ... Wireless power transmission device, 100, 101 ... Wireless power feeding device, 200, 201 ... Wireless power receiving device, 210 ... Housing, 220 ... Magnetic shield material, 230 ... Rectifier, 240 ... Charger, 250, 251 , 252, 260, 261 ... capacitor, 270 ... commercial power supply, 300 ... ground side power supply device, 310 ... first power converter, 400 ... vehicle side power supply device, 410 ... second power converter, INV, INV2: inverter, L1, L3 ... feeding coil unit, L11 ... feeding coil, L2, L4 ... receiving coil unit, L12 ... receiving coil, L5 ... ground side coil knit, L51 ... ground side coil, L6 ... vehicle side coil unit, L61 ... Vehicle side coil, 500 ... Ground side coil space, VG ... Power source, 600 ... Case, 610 ... Top, 620 ... Cutting plate, 630 ... bottom, 640 ... side portion, 650 ... struts, 660 ... projection, 700 ... feeding coil space, 720 ... magnetic, 800 ... sensor space, 810 ... sensor, 900 ... power receiving coil space.

Claims (12)

A coil unit provided on the ground side,
Coils,
At least one sensor for detecting an object existing above or around the coil unit;
A housing for housing the coil and the sensor,
The housing holds a partition plate that is divided into a coil space for housing the coil and a sensor space for housing the sensor, which is positioned vertically above the coil space, and an internal space of the sensor space. And at least one strut,
In the sensor space, the sensor is disposed on the partition plate in a non-contact manner with the upper inner surface of the housing .
The sensor has a hole penetrating in the vertical direction,
The support column extends vertically through the hole of the sensor,
The coil unit has a plurality of the sensors,
The casing is a coil unit having a plurality of the columns .   The coil unit according to claim 1, wherein the sensor is a metal detection coil. The said housing | casing is a coil unit of Claim 1 or 2 which has the protrusion extended in the downward direction from the said partition plate in the said coil space. The coil unit according to claim 3 , wherein the protrusion has a hollow cylindrical shape. The coil unit according to claim 3 or 4 , wherein the coil is wound with an inner peripheral edge in contact with the protrusion. The sensor space is a space defined by a top portion, a side surface portion, and a partition plate of the housing,
The thickness of the said partition plate is a coil unit as described in any one of Claims 1-5 thicker than the thickness of the said top part. The coil unit according to any one of claims 1 to 6 , wherein the coil is a coil that exchanges AC power via a magnetic field. A wireless power supply device provided on the ground side,
The wireless electric power feeder which has a coil unit as described in any one of Claims 1-6 . A wireless power receiving device provided on the ground side,
The wireless power receiving apparatus which has a coil unit as described in any one of Claims 1-6 . A wireless power feeder provided on the ground side,
A wireless power receiving device mounted on a vehicle,
The wireless power transmission apparatus according to claim 8 , wherein the wireless power transmission apparatus is a wireless power transmission apparatus. A wireless power feeder mounted on the vehicle;
A wireless power receiving device provided on the ground side,
The wireless power transmission apparatus according to claim 9 , wherein the wireless power reception apparatus is a wireless power reception apparatus. A vehicle-side power supply device mounted on the vehicle;
A ground-side power supply device that wirelessly exchanges power with the vehicle-side power supply device,
The wireless power transmission apparatus having the coil unit according to claim 7 , wherein the ground-side power supply apparatus.

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