JP6476713B2 - Coil unit for wireless power transmission - Google Patents

Description

  The present invention relates to a coil unit for wireless power transmission.

  In recent years, wireless power transmission technology for supplying power without a power cord has been attracting attention. The current wireless power transmission technologies are: (A) a type that uses electromagnetic induction (for short distance), (B) a type that uses a magnetic field resonance phenomenon (for medium distance), and (C) a type that uses radio waves (far). It can be roughly divided into three types.

  Among these three types of wireless power transmission technologies, the type (A) that uses electromagnetic induction is a power transmission technology that uses the voltage generated in the power receiving side coil as a result of alternating current passing through the power feeding side coil generating a magnetic field. In this type of electromagnetic induction, although the power transmission efficiency decreases rapidly when the distance is increased, sufficient power transmission efficiency can be obtained at a short distance of about several centimeters and can be realized at low cost. Therefore, it is generally used in household appliances such as electric shavers.

  Type (B) using the resonance phenomenon of a magnetic field is a relatively new technology, which is a wireless power transmission technology in which a pair of self-resonant coils are resonated in an electromagnetic field and transmitted via the electromagnetic field. By applying this technology, it is possible to transmit a large amount of power of several kW with high power transmission efficiency even at a distance of several meters. For example, a proposal has been studied in which a power receiving coil is embedded in the lower part of an electric vehicle and electric power is sent in a non-contact manner from a power feeding coil in the ground. Since it is wireless, a completely insulated system configuration is possible, and it is considered to be particularly effective for power supply in rainy weather.

  In the type (A) using the electromagnetic induction and the type (B) of the wireless power transmission device using the magnetic field resonance phenomenon, it is required to transmit power from the power supply side coil to the power reception side coil as efficiently as possible. .

  The magnetic flux radiated from the power transmission side and power reception side coils is inevitably divided into the magnetic flux used for power supply and reception and the magnetic flux that does not contribute to power supply and reception. To improve power transmission efficiency, the power transmission side and the power reception side Of the magnetic flux radiated from the coil, it is necessary to increase the proportion of the magnetic flux used for power supply and reception.

  Further, the magnetic flux radiated from the power transmission side and power reception side coils needs to be sufficiently cut off in order to avoid the influence on the peripheral devices.

  As described above, in order to effectively shield the magnetic flux radiated from the power transmission side and the power reception side coil that does not contribute to power supply and reception, there is a magnetic material, metal around the power transmission side and the power reception side coil. A shielding material such as a material is used.

  Furthermore, in the type (A) that uses electromagnetic induction and the type (B) that uses a magnetic field resonance phenomenon, a high voltage is applied to the coil to transmit power regardless of the operating principle. A predetermined insulation distance between the coil and the magnetic material or metal material around the coil (for example, a spatial distance that ensures a potential difference that does not cause a spatial discharge or a potential difference that does not cause a creeping discharge) It is necessary to secure the creepage distance that is the length to be secured.

  However, in order to secure the insulation distance, the distance from the coil edge is ensured spatially, the exposed surface of the coil is covered with an insulating coating such as tape, and an insole is inserted in the bobbin to interpose an insulator. If it does, a coil unit will enlarge.

  As a power transmission / reception coil capable of increasing the number of turns while suppressing an increase in coil size, for example, Patent Document 1 discloses a coil conductor on a substrate having a first layer and a second layer. A feeding or receiving coil is disclosed which is wound on a layer and then wound on a second layer.

JP 2011-86890 A

  However, since the power transmission and reception coils of Patent Document 1 are bonded to each other, the present inventors have isolated the coil conductor from a metal material such as a shield material to be disposed around the substrate. It has been found that the structure is insufficient and it is necessary to ensure a sufficient insulation distance.

  In addition, when the wireless power transmission technology is applied to a charging facility for a moving body, the power feeding coil is disposed on the ground. At this time, load resistance performance against the mobile body riding on the power feeding coil is improved. It is necessary to secure. However, in Patent Document 1, no consideration is given to the load bearing performance of the power supply coil, and the problem of ensuring sufficient load bearing performance still remains.

  Therefore, the present invention can ensure sufficient insulation between the wire and a metal material such as a shielding material disposed around the coil unit without increasing the size, and improve the load resistance performance of the coil unit. Another object is to provide a coil unit for wireless power transmission.

  A coil unit for wireless power transmission according to the present invention covers a planar bobbin having first and second main surfaces facing each other, a wire wound around the first main surface, and the first main surface. The first main surface is composed of a first groove portion and a first protrusion, and the wire rod is formed along the first groove portion and the first protrusion. A first main surface side winding housing portion provided, and a second groove portion and a second groove extending outwardly of the first main surface side winding housing portion along the protruding direction of the first protrusion. A first main surface side insulation protection portion configured by a protrusion, and the insulating cover member includes a third protrusion corresponding to the second groove and a second protrusion corresponding to the second protrusion. 3 grooves are provided.

  According to the present invention, the first composed of the second groove portion and the second protrusion extending along the protruding direction of the first protrusion on the outer peripheral side of the first main surface side winding housing portion. The main surface side insulation protection part. Therefore, the current flowing through the wire discharges along the second protrusion and the second groove, and the creepage distance from the metal material disposed outside the coil unit can be increased. That is, the insulation distance between the wire and a metal material such as a shield material to be disposed around the coil unit can be extended, and sufficient insulation can be ensured.

  In the coil unit for wireless power transmission according to the present invention, the insulating cover member is provided with a third protrusion corresponding to the second groove and a third groove corresponding to the second protrusion. Yes. Therefore, even if stress is applied to the outer peripheral portion of the wireless power transmission coil unit, the tip surface of the third protrusion comes into contact with the bottom surface of the second groove and functions as a support column. Since the tip surface and the bottom surface of the third groove portion come into contact with each other and function as a support column, it is possible to improve load bearing performance in the outer peripheral portion of the wireless power transmission coil unit. That is, when the wireless power transmission coil unit according to the present invention is applied to a power feeding coil unit in a charging facility for a moving body, load resistance performance against the mobile body riding on the outer peripheral portion of the power feeding coil unit is ensured. be able to. Therefore, without increasing the size, it is possible to ensure sufficient insulation between the wire and a metal-based material such as a shielding material that is arranged around the coil unit, and the wireless power that improves the load bearing performance of the coil unit A transmission coil unit can be provided.

  Preferably, a plurality of second protrusions, second groove parts, third protrusion parts, and third groove parts may be provided. In this case, the insulation distance between the wire and the metal material such as the shielding material to be placed around the coil unit can be further extended without impairing the load bearing performance of the coil unit, thereby ensuring insulation. can do.

  Preferably, an insulating base member provided so as to cover the second main surface is further provided, the wire is wound also on the second main surface, and the second main surface is the fourth main surface. A second main-surface-side winding accommodating portion configured by a groove and a fourth protrusion, and provided with a wire along the fourth groove and the fourth protrusion; and a second main-surface-side winding A second main surface-side insulating protection portion including a fifth groove portion and a fifth protrusion portion extending along the protruding direction of the fourth protrusion portion on the outer peripheral side with respect to the storage portion; The base member may include a sixth protrusion corresponding to the fifth groove and a sixth groove corresponding to the fifth protrusion. In this case, since the wire is a multilayer coil wound continuously in a layered manner, sufficient insulation between the wire and a metal-based material such as a shield material to be disposed around the coil unit is ensured. In addition, the inductance value of the coil unit can be improved while improving the load bearing performance of the coil unit.

  More preferably, a plurality of fifth protrusions, fifth groove parts, sixth protrusion parts, and sixth groove parts may be provided. In this case, the insulation distance between the wire wound on the second main surface and the metal-based material such as the shielding material disposed around the coil unit is further increased without impairing the load bearing performance of the coil unit. It can be extended and insulation can be ensured reliably.

  Preferably, between the tip surface of the second protrusion and the bottom surface of the third groove, between the bottom surface of the second groove and the tip surface of the third protrusion, and the tip surface of the fifth protrusion You may further provide the shock absorbing material provided between the bottom face of a 6th groove part, and between the bottom face of a 5th groove part, and the front end surface of a 6th protrusion part. In this case, stress is applied to the outer peripheral portion of the coil unit for wireless power transmission, the tip surface of the second protrusion and the bottom surface of the third groove portion come into contact with each other, and function as a support column. The front end surface of the protrusion of the second contact portion functions as a support column, the front end surface of the fifth protrusion portion and the bottom surface of the sixth groove portion contact and function as a support column, and the bottom surface of the fifth groove portion and the sixth protrusion It is possible to improve the impact resistance performance when the tip surface of the part comes into contact and functions as a column. Therefore, it is possible to provide a wireless power transmission coil unit in which the impact resistance performance of the coil unit is improved.

  According to the present invention, it is possible to sufficiently secure insulation between the wire and a metal material such as a shielding material to be disposed around the coil unit without increasing the size, and improve the load resistance performance of the coil unit. A coil unit for wireless power transmission can be provided.

It is a schematic block diagram which shows the wireless power transmission apparatus with which the coil unit for wireless power transmission which concerns on suitable embodiment of this invention is applied with a load. It is the perspective view which showed typically the coil unit for wireless power transmission which concerns on 1st embodiment of this invention. It is sectional drawing which showed typically the coil unit for wireless power transmission which concerns on 1st Embodiment of this invention. It is sectional drawing which showed typically the coil unit for wireless power transmission which concerns on 2nd Embodiment of this invention. It is sectional drawing which showed typically the coil unit for wireless power transmission which concerns on 3rd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to 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.

  First, an overall configuration of a wireless power transmission device A to which a coil unit for wireless power transmission according to a preferred embodiment of the present invention is applied will be described with reference to FIG. FIG. 1 is a schematic configuration diagram illustrating a wireless power transmission device to which a coil unit for wireless power transmission according to a preferred embodiment of the present invention is applied together with a load. The coil unit for wireless power transmission according to the present invention can be applied to either the wireless power feeding device or the wireless power receiving device in the wireless power transmission device. Here, the coil unit for wireless power transmission according to the present invention is used. A description will be given using an example applied to a wireless power supply apparatus.

  As illustrated in FIG. 1, the wireless power transmission device A includes a wireless power feeding device a1 and a wireless power receiving device a2. The wireless power transmission device A according to the present embodiment is applied to a charging facility for a vehicle. Examples of vehicles to which the wireless power transmission device A is applied include an electric vehicle (BEV) that uses the power of a secondary battery, a hybrid vehicle (PHEV), and the like.

  The wireless power feeder a1 includes a power source a11, an inverter a12, and a power feeding coil unit a13. The wireless power receiving device a2 includes a power receiving coil unit a21 and a rectifying unit a22. The power source a11 supplies DC power to an inverter a12 described later. The power source a11 is not particularly limited as long as it outputs DC power, and is a DC power source obtained by rectifying and smoothing 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. Etc.

  The inverter a12 has a function of converting input DC power supplied from the power source a11 into AC power. In the present embodiment, the inverter a12 converts input DC power supplied from the power source a11 into AC power and supplies the AC power to the power receiving unit a21 described later. The inverter a12 includes 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 MOS-FETs (Metal Oxide Semiconductor-Field Effect Transistors) and IGBTs (Insulated Gate Bipolar Transistors).

  The power feeding coil unit a13 has a function of transmitting AC power supplied from the inverter a12 to a power receiving coil unit a21 described later. In the present embodiment, the feeding coil unit a13 is disposed in the ground or in the vicinity of the ground. The specific configuration of the coil unit for wireless power transmission applied to the feeding coil unit a13 will be described later.

  The power receiving coil unit a21 has a function of receiving AC power transmitted from the power feeding coil unit a13. In the present embodiment, the power receiving coil unit a21 is mounted on the lower part of the vehicle.

  The rectifying unit a22 has a function of rectifying the AC power received by the power receiving coil unit a21 into DC power. Examples of the rectification unit a22 include a conversion circuit having a full-wave rectification function using a diode bridge and a power smoothing function using a capacitor and a three-terminal regulator. The DC power rectified by the rectification unit a22 is output to the load B. Here, examples of the load B include a secondary battery and a rotating machine included in the vehicle. In addition, when the load B is an AC rotating machine, it is necessary to add an inverter (not shown) between the rectifying unit a22 of the wireless power receiving device a2 and the load B to supply AC power to the AC rotating machine. is there.

  By providing such a configuration, the power feeding coil unit a13 of the wireless power feeding device a1 and the power receiving coil unit a21 of the wireless power receiving device a2 face each other, thereby realizing the wireless power transmission device A that transmits power wirelessly. The

(First embodiment)
Next, with reference to FIG. 2 and FIG. 3, details of the wireless power transmission coil unit Lu1 according to the first embodiment of the present invention applied to the feeding coil unit a13 in the above-described wireless power transmission device A will be described. . 2 and 3 are a perspective view and a cross-sectional view schematically showing the coil unit for wireless power transmission according to the first embodiment of the present invention.

  As shown in FIG. 2 and FIG. 3, the wireless power transmission coil unit includes a planar bobbin C, a wire D, an insulating cover member E, and a shield material G.

  The planar bobbin C has a substantially rectangular parallelepiped shape. Specifically, the planar bobbin C is opposed to the substantially square first and second main surfaces C1s and C2s facing each other and the first and second side surfaces C3s and C4s facing each other as the outer surface thereof. And third and fourth side surfaces (not shown). The first and second side surfaces C3s and C4s extend in the first direction so as to connect the first and second main surfaces C1s and C2s. Third and fourth side surfaces (not shown) extend in a second direction orthogonal to the first direction so as to connect the first and second main surfaces C1s and C2s. In the present embodiment, the first and second main surfaces C1s and C2S of the planar bobbin C are substantially square, but the shape is not limited to this, and any shape of a polygon, a circle, and an ellipse is used. It may be presented. The material of the planar bobbin C is preferably an insulating resin, and examples thereof include acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS), polybutylene terephthalate resin (PBT), and polyphenylene sulfide resin (PPS).

  The first main surface C1s of the planar bobbin C has a bottomed hole provided at the center, a first main surface side winding housing portion C11, and a first main surface side insulation protection portion C12. . The first main surface side winding housing part C11 is composed of a first groove C1m and a first protrusion C1t formed in a spiral shape from the central bottomed hole toward the outer peripheral side. Specifically, the first protrusion C1t extends along the facing direction of the first main surface C1s and the second main surface C2s of the planar bobbin C, and the first protrusion C1t is the first protrusion C1t. Predetermined in a direction orthogonal to the facing direction of the first main surface C1s and the second main surface C2s (the facing direction of the first side surface C3s and the second side surface C4s and the facing direction of the third side surface and the fourth side surface) A plurality are arranged with an interval of. The first groove C1m is formed between two first protrusions C1t among the plurality of first protrusions C1t. And the wire D mentioned later is provided along the 1st groove part C1m and the 1st protrusion C1t. That is, a space in which the wire D to be described later is stored is defined by the bottom surface of the first groove C1m and the side surfaces (common) of the first protrusion C1t and the first groove C1m.

  The 1st main surface side insulation protection part C12 has on the outer peripheral side rather than the 1st main surface side winding accommodating part C11. The first main surface side insulation protection portion C12 is composed of a second groove portion C2m and a first protrusion C2t formed in a spiral shape from the first main surface side winding housing portion C11 toward the outer peripheral side. Yes. Specifically, the second protrusion C2t extends along the facing direction of the first main surface C1s and the second main surface C2s of the planar bobbin C. That is, the second protrusion C2t extends along the protruding direction of the first protrusion C1t. The second groove C2m is formed adjacent to the first protrusion C2t. In the present embodiment, a plurality of second protrusions C2t and a plurality of second grooves C2m are provided. Therefore, a space is defined by the bottom surface of the second groove C2m and the side surfaces (common) of the second protrusion C2t and the second groove C2m.

  The wire D is wound on the first main surface C1s of the planar bobbin C. Specifically, it is provided in the first main surface side winding housing portion C11 of the first main surface C1s of the planar bobbin C. More specifically, it is wound along a space defined by the bottom surface of the first groove C1m and the side surfaces (common) of the first protrusion C1t and the first groove C1m. Examples of the wire D 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.

  The insulating cover member E is disposed so as to cover the first main surface C1s of the planar bobbin C. In this embodiment, it arrange | positions so that the 1st side surface C3s and 2nd side surface C4s of the planar bobbin C may also be covered. That is, the insulating cover member E serves as a housing for the wireless power transmission coil unit Lu1. Further, the insulating cover member E corresponds to the third protrusion E3t corresponding to the second groove C2m and the second protrusion C2t on the surface side facing the first main surface C1s of the planar bobbin C. A third groove E3m is provided. Specifically, the third protrusion E3t is provided so that the tip surface thereof faces the bottom surface of the second groove C2m, and the third groove E3m has the bottom surface of the tip of the second protrusion C2t. It is provided so as to face the surface. The third protrusion E3t and the third groove E3m are provided adjacent to each other. In the present embodiment, a plurality of third protrusions E3t and a plurality of third grooves E3m are provided. Therefore, a space for accommodating the second protrusion C2t is defined by the bottom surface of the third groove E3m and the side surfaces (common) of the third protrusion E3t and the third groove E3m. The insulating cover member E may be disposed in contact with the front end surface of the first protrusion C1t, or may be disposed with a gap between the front end surface of the first protrusion C1t. The tip end surface of the third protrusion E3t of the insulating cover member E may be disposed in contact with the bottom surface of the second groove C2m, and a gap is provided between the bottom surface of the second groove C2m. You may arrange. Still further, the bottom surface of the third groove E3m of the insulating cover member E may be disposed in contact with the tip surface of the second protrusion C2t, and between the tip surface of the second protrusion C2t. A gap may be provided.

  The shield material G is arranged to face the second main surface C2s of the planar bobbin C. In the present embodiment, the shield material G has a plate shape and extends in a direction orthogonal to the opposing direction of the first main surface C1s and the second main surface C2s of the planar bobbin C. The shield material G has a function as an electromagnetic shield material that blocks the passage of magnetic flux by canceling the magnetic field by induced current, eddy current, or the like. Further, the shield material G may play a part of the role of the housing as a base plate of the wireless power transmission coil unit Lu1. Such a shielding material G is not particularly limited as long as it is a metal material, and aluminum, copper, and the like are preferable. The shield material G may be disposed in contact with the second main surface C2s of the planar bobbin C, or may be disposed with a gap.

  As described above, in the coil unit Lu1 for wireless power transmission according to the present embodiment, the protruding direction of the second groove C2m and the first protrusion C1t on the outer peripheral side with respect to the first main surface side winding housing part C11. 1st main surface side insulation protection part C12 comprised from the 2nd projection C2t extended along. For this reason, the current flowing through the wire D is discharged along the second protrusion C2t and the second groove C2m, and the creeping distance from the metal material disposed outside the coil unit can be increased. That is, the insulation distance between the wire D and a metal material (shield material G) such as a shield material to be disposed around the coil unit can be extended, and sufficient insulation can be ensured.

  Further, in the wireless power transmission coil unit Lu1 according to the present embodiment, the insulating cover member E has a third protrusion E3t corresponding to the second groove C2m, and a third protrusion corresponding to the second protrusion C2t. A groove E3m is provided. Therefore, even if stress is applied to the outer peripheral portion of the wireless power transmission coil unit Lu1, the tip surface of the third protrusion E3t comes into contact with the bottom surface of the second groove C2m and functions as a support column. Since the front end surface of the protrusion C2t and the bottom surface of the third groove E3m are in contact with each other and function as a support column, it is possible to improve load bearing performance at the outer peripheral portion of the wireless power transmission coil unit Lu1. That is, when the coil unit Lu1 for wireless power transmission according to the present embodiment is applied to the feeding coil unit a13 in the charging facility for the moving body, the load resistance against the moving body riding on the outer peripheral portion of the feeding coil unit a13. Performance can be ensured. Therefore, the insulation between the wire D and the metal material (shield material G) such as a shield material to be arranged around the coil unit can be sufficiently secured without increasing the size, and the load resistance performance of the coil unit. It is possible to provide a coil unit Lu1 for wireless power transmission that is improved.

  Furthermore, in the coil unit Lu1 for wireless power transmission according to the present embodiment, a plurality of second protrusions C2t, second grooves C2m, third protrusions E3t, and third grooves E3m are provided. Yes. Therefore, without impairing the load bearing performance of the coil unit, the insulation distance between the wire D and a metal-based material (shield material G) such as a shield material to be disposed around the coil unit can be further extended. Insulation can be ensured reliably.

(Second Embodiment)
Subsequently, the configuration of the wireless power transmission coil unit Lu2 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view schematically showing a coil unit for wireless power transmission according to the second embodiment of the present invention. The wireless power transmission coil unit Lu2 according to the second embodiment includes a planar bobbin C2 and a wire D2 instead of the planar bobbin C and the wire D, and further includes an insulating base member F. This is different from the coil unit Lu1 for wireless power transmission according to the first embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 3, the wireless power transmission coil unit Lu2 includes a planar bobbin C2, a wire D2, an insulating cover member E, an insulating base member F, and a shield material G. Here, the configurations of the insulating cover member E and the shield material G are the same as those of the coil unit Lu1 for wireless power transmission according to the first embodiment.

  The planar bobbin C2 has a substantially rectangular parallelepiped shape as the planar bobbin C of the wireless power transmission coil unit Lu1 according to the first embodiment. 1st and 2nd main surface C1s and C2s, 1st and 2nd side surface C3s and C4s which oppose, and 3rd and 4th side surface (not shown) which oppose. The arrangement relationship between the first and second main faces C1s and C2s, the first and second side faces C3s and C4s, and the third and fourth side faces (not shown) is for wireless power transmission according to the first embodiment. This is the same as the coil unit Lu2.

  The first main surface C1s of the planar bobbin C2 includes a bottomed hole provided at the center, a first main surface side winding housing portion C11, and a first main surface side insulation protection portion C12. . Here, the configurations of the first main surface side winding housing portion C11 and the first main surface side insulation protection portion C12 are the same as those of the coil unit Lu1 for wireless power transmission according to the first embodiment.

  The second main surface C2s of the planar bobbin C2 includes a bottomed hole provided in the center, a second main surface side winding storage portion C21, and a second main surface side insulation protection portion C22. . The second main surface side winding housing portion C21 includes a fourth groove portion C4m and a fourth protrusion C4t formed in a spiral shape from the central bottomed hole toward the outer peripheral side. Specifically, the fourth protrusion C4t extends along the opposing direction of the first main surface C1s and the second main surface C2s of the planar bobbin C2, and the fourth protrusion C4t is the first protrusion C4t. Predetermined in a direction orthogonal to the facing direction of the first main surface C1s and the second main surface C2s (the facing direction of the first side surface C3s and the second side surface C4s and the facing direction of the third side surface and the fourth side surface) A plurality are arranged with an interval of. The fourth groove C4m is formed between two fourth protrusions C4t among the plurality of fourth protrusions C4t. And the wire D2 mentioned later is provided along the 4th groove part C4m and the 4th protrusion C4t. That is, a space in which the wire D2 described later is stored is defined by the bottom surface of the fourth groove C4m and the side surfaces (common) of the fourth protrusion C4t and the fourth groove C4m.

  The 2nd main surface side insulation protection part C22 has on the outer peripheral side rather than the 2nd main surface side winding accommodating part C21. The second main surface side insulation protection portion C22 includes a fifth groove portion C5m and a fifth protrusion C5t formed in a spiral shape from the second main surface side winding housing portion C21 toward the outer peripheral side. Yes. Specifically, the fifth protrusion C5t extends along the facing direction of the first main surface C1s and the second main surface C2s of the planar bobbin C2. That is, the fifth protrusion C5t extends along the protruding direction of the fourth protrusion C4t. The fifth groove C5m is formed adjacent to the fifth protrusion C5t. In the present embodiment, a plurality of fifth protrusions C5t and a plurality of fifth grooves C5m are provided. Therefore, a space is defined by the bottom surface of the fifth groove C5m and the side surfaces (common) of the fifth protrusion C5t and the fifth groove C5m.

  The wire D2 is wound on the first main surface C1s of the planar bobbin C2, similarly to the wire D of the wireless power transmission coil unit Lu1 according to the first embodiment. In the present embodiment, the wire D2 is also wound on the second main surface C2s of the planar bobbin C2. Specifically, it is provided in the second main surface side winding housing portion C21 of the second main surface C2s of the planar bobbin C2. More specifically, it is wound along a space defined by the bottom surface of the fourth groove C4m and the side surfaces (common) of the fourth protrusion C4t and the fourth groove C4m. In addition, as for wire D2, the edge part wound on 1st main surface C1s of planar bobbin C2 and the edge part wound on 2nd main surface C2s of planar bobbin C2 are connected. May be. In this case, since the wire rod D2 is continuously wound in layers from the first main surface C1s to the second main surface C2s of the planar bobbin C2, while suppressing the increase in size of the coil unit, The inductance value of the coil can be improved.

  The insulating base member F is disposed so as to cover the second main surface C2s of the planar bobbin C2. That is, in the present embodiment, the insulating cover member E and the insulating base member F serve as a housing for the wireless power transmission coil unit Lu2. The insulating base member F corresponds to the sixth protrusion F6t corresponding to the fifth groove C5m and the fifth protrusion C5t on the surface facing the second main surface C2s of the planar bobbin C2. A sixth groove F6m is provided. Specifically, the sixth protrusion E6t is provided such that the tip surface thereof faces the bottom surface of the fifth groove C5m, and the bottom surface of the sixth groove E6m is the tip of the fifth protrusion C5t. It is provided so as to face the surface. The sixth protrusion E6t and the sixth groove E6m are provided adjacent to each other. In the present embodiment, a plurality of sixth protrusions E6t and sixth groove portions E6m are provided. Therefore, a space for accommodating the fifth protrusion C5t is defined by the bottom surface of the sixth groove E6m and the side surfaces (common) of the sixth protrusion E6t and the sixth groove E6m. The insulating base member F may be disposed in contact with the tip surface of the fourth protrusion C4t, or may be disposed with a gap between the tip surface of the fourth protrusion C4t. Further, the tip end surface of the sixth protrusion E6t of the insulating base member F may be disposed in contact with the bottom surface of the fifth groove C5m, and a gap is provided between the bottom surface of the fifth groove C5m. You may arrange. Still further, the bottom surface of the sixth groove E6m of the insulating base member F may be disposed in contact with the tip surface of the fifth protrusion C5t, and between the tip surface of the fifth protrusion C5t. A gap may be provided.

  As described above, the coil unit Lu2 for wireless power transmission according to the present embodiment further includes the insulating base member F provided so as to cover the second main surface C2s, and the wire D2 includes the second main surface. The second main surface C2s is also composed of a fourth groove C4m and a fourth protrusion C4t, and extends along the fourth groove C4m and the fourth protrusion C4t. The second main surface side winding storage portion C21 provided with the wire D2, and the protruding direction of the fifth groove portion C5m and the fourth protrusion C4t on the outer peripheral side of the second main surface side winding storage portion C21 And a second main surface side insulation protection portion C22 constituted by a fifth protrusion C5t extending along the base, and the insulating base member F is a sixth protrusion corresponding to the fifth groove C5m E6t and a sixth groove E6m corresponding to the fifth protrusion C5t are provided. Therefore, since the wire D2 is a multilayer coil wound continuously in a layered manner, the wire D2 and a metal-based material (shield material G) such as a shield material to be disposed around the coil unit. It is possible to improve the inductance value of the coil unit while ensuring sufficient insulation and improving the load bearing performance of the coil unit.

  In the coil unit Lu2 for wireless power transmission according to the present embodiment, a plurality of fifth protrusions C5t, fifth grooves C5m, sixth protrusions E6t, and sixth grooves E6m are provided. ing. Therefore, without impairing the load bearing performance of the coil unit, the wire D2 wound on the second main surface C2s and the metal material (shield material G) such as a shield material to be disposed around the coil unit. The insulation distance can be further extended, and insulation can be reliably ensured.

  Subsequently, the configuration of the wireless power transmission coil unit Lu3 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view schematically showing a coil unit for wireless power transmission according to a third embodiment of the present invention. The wireless power transmission coil unit Lu3 according to the third embodiment is different from the wireless power transmission coil unit Lu2 according to the second embodiment in that it further includes a buffer material H. Hereinafter, a description will be given focusing on differences from the second embodiment.

  As shown in FIG. 5, the wireless power transmission coil unit Lu3 includes a planar bobbin C2, a wire D2, an insulating cover member E, an insulating base member F, a shield material G, and a buffer material H. . Here, the configuration of the planar bobbin C2, the wire D2, the insulating cover member E, the insulating base member F, and the shield material G is the same as that of the wireless power transmission coil unit Lu2 according to the second embodiment.

  The buffer material H is provided between the planar bobbin C2 and the insulating cover member E and between the planar bobbin C2 and the insulating base member F. Specifically, as shown in FIG. 4, between the tip surface of the second protrusion C2t and the bottom surface of the third groove E3m, the bottom surface of the second groove C2m and the tip of the third protrusion E3t. Between the front surface of the fifth protrusion and the bottom surface of the sixth groove E6m, and between the bottom surface of the fifth groove C5m and the front surface of the sixth protrusion E6t. It has been. Examples of the material of the buffer material H include an impact absorbing material made of styrene or urethane.

  As described above, the coil unit Lu3 for wireless power transmission according to the present embodiment is between the tip surface of the second protrusion C2t and the bottom surface of the third groove E3m, the bottom surface of the second groove C2m, and the third Between the tip of the projection E3t, between the tip of the fifth projection C5t and the bottom of the sixth groove E6m, and between the bottom of the fifth groove C5m and the tip of the sixth projection E6t. A cushioning material H provided between the surface and the surface is provided. Therefore, stress is applied to the outer peripheral portion of the coil unit Lu3 for wireless power transmission, the tip surface of the second protrusion C2t and the bottom surface of the third groove portion E3m come into contact with each other and function as a support column, and the bottom surface of the second groove portion C2m The tip surface of the third projection E3t comes into contact with the tip surface and functions as a support column, the tip surface of the fifth projection C5t and the bottom surface of the sixth groove portion E6m come into contact with each other and functions as a support column, and the fifth groove portion C5m It is possible to improve the impact resistance performance when the bottom surface of the first member and the tip surface of the sixth protrusion E6t come into contact with each other and function as a support column. Therefore, it is possible to provide the coil unit Lu3 for wireless power transmission in which the impact resistance performance of the coil unit is improved.

  The present invention has been described based on the embodiments. It will be understood by those skilled in the art that the embodiments are illustrative, and that various modifications and changes are possible within the scope of the claims of the present invention, and that such modifications and changes are also within the scope of the claims of the present invention. By the way. Accordingly, the description and drawings herein are to be regarded as illustrative rather than restrictive.

  A ... wireless power transmission device, B ... load, a1 ... wireless power feeding device, a11 ... power source, a12 ... inverter, a13 ... power feeding coil unit, a2 ... wireless power receiving device, a21 ... power receiving coil unit, a22 ... rectifier, C, C2 ... Planar bobbin, C1s ... First main surface, C11 ... First main surface side winding housing portion, C12 ... First main surface side insulation protection portion, C1m ... First groove portion, C1t ... First C2m ... second groove, C2t ... second protrusion, C2s ... second main surface, C3s ... first side, C4s ... second side, C4m ... fourth groove, C4t ... 4th protrusion, C21 ... 2nd main surface side winding storage part, C5m ... 5th groove part, C5t ... 5th protrusion, C22 ... 2nd main surface side insulation protection part, D, D2 ... Wire, E ... Insulating cover member, E3t ... Third projection, E3m ... Third groove, F Insulating base member, F6t ... sixth projections, F6m ... groove 6, G ... shielding material, H ... cushioning material, Lu1~Lu3 ... wireless power transmission coil unit.

Claims (5)

A planar bobbin having opposing first and second main surfaces;
A wire wound on the first main surface;
An insulating cover member provided so as to cover the first main surface,
The first main surface is composed of a first groove and a first protrusion, and the first main surface is provided with the wire along the first groove and the first protrusion. Winding housing,
1st main surface side comprised from the 2nd groove part and the 2nd protrusion extended along the protrusion direction of the said 1st protrusion in the outer peripheral side rather than the said 1st main surface side winding accommodating part An insulation protection part,
The wireless power transmission coil, wherein the insulating cover member is provided with a third protrusion corresponding to the second groove and a third groove corresponding to the second protrusion. unit.   2. The wireless power transmission according to claim 1, wherein a plurality of each of the second protrusion, the second groove, the third protrusion, and the third groove is provided. Coil unit. An insulating base member provided so as to cover the second main surface;
The wire is wound also on the second main surface,
The second main surface includes a fourth groove portion and a fourth protrusion, and the second main surface side on which the wire is provided along the fourth groove portion and the fourth protrusion. Winding housing,
2nd main surface side comprised from the said 5th groove part and the 5th protrusion extended along the protrusion direction of the said 4th protrusion in the outer peripheral side rather than the said 2nd main surface side coil | winding accommodating part. An insulation protection part,
The said insulating base member is provided with the 6th protrusion part corresponding to the said 5th groove part, and the 6th groove part corresponding to the said 5th protrusion part, The Claim 1 or 2 characterized by the above-mentioned. A coil unit for wireless power transmission described in 1.   The wireless power transmission according to claim 3, wherein a plurality of the fifth protrusions, the fifth groove parts, the sixth protrusion parts, and the sixth groove parts are provided. Coil unit. Between the tip surface of the second protrusion and the bottom surface of the third groove, between the bottom surface of the second groove and the tip surface of the third protrusion, and the tip of the fifth protrusion A cushioning material is further provided between the surface and the bottom surface of the sixth groove, and between the bottom surface of the fifth groove and the tip surface of the sixth protrusion. Item 5. The coil unit for wireless power transmission according to Item 3 or 4 .

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