JP6275470B2 - Wireless power supply system - Google Patents

Description

  The present invention relates to a wireless power feeding system.

  Application of a conventional wireless power feeding system to, for example, an electric device mounted on a vehicle is being studied. The wireless power feeding system transmits power from the power transmission side coil to the power reception side coil in a non-contact manner by various methods, and supplies the power received by the power reception side coil to various electric devices. For example, Patent Document 1 discloses a technique related to power supply to an electric device applied to a vehicle in which a wire harness connected between a light source and a fixed portion that can be relatively rotated or moved relative to each other is moved when the light source moves. A wire harness mounting structure for an illuminating lamp is disclosed in which an external force is not applied between the connector at the end and the wire harness even if it is deformed to prevent disconnection.

JP 2009-83895 A

  By the way, the wireless power feeding system as described above has room for further improvement in terms of improving the mounting workability when applied to a vehicle, for example.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a wireless power feeding system capable of improving the mounting workability.

In order to achieve the above object, a wireless power feeding system according to the present invention includes a solar panel that generates power, a power transmission circuit that converts power from the solar panel from a direct current to an alternating current, and an alternating current by the power transmission circuit. A power transmission side coil to which power converted into the electric power is supplied is mounted on the power transmission side substrate, and at least the power transmission side substrate unit provided by exposing the solar panel to the outer side of the outer shell member of the vehicle, and the power transmission side coil A power receiving side coil that receives power in a non-contact manner, a power receiving circuit that converts power received by the power receiving side coil from an alternating current to a direct current, and a drive that consumes the power converted to a direct current by the power receiving circuit An electric device to be mounted on the power receiving side board and provided on the inner side of the outer shell member. And the and the power reception side board unit, the power transmission coil and said receiver coil is provided in the power transmission is possible positions of the opposing the power transmitting coil to the power receiving coil, said electrical device, said It is a room light for interior lighting of a vehicle, and the power receiving side board unit is provided on the inner surface of the outer shell member .

  In the wireless power feeding system, the power receiving side board unit may further include a power storage device that stores power received by the power receiving side coil mounted on the power receiving side board.

Further, in the wireless power feeding system, the power receiving side board unit is configured such that the power receiving side coil, the power receiving circuit, the indoor lamp as the electric device, and the power receiving side board are integrated with each other relative to the power transmitting side board unit. It is possible to change the irradiation direction of the light from the room lamp by changing the angle.

  A wireless power feeding system according to the present invention includes a solar panel as a power source, a power transmission circuit, a power transmission side board unit in which a power transmission side coil is unitized on the outside of the outer shell member, a power reception side coil, a power reception circuit, and a power supply destination. By providing a power-receiving-side board unit in which a certain electric device is unitized on the inner side of the outer shell member so that the power-transmitting side coil and the power-receiving-side coil face each other, a power supply system to the electric devices on the inner side of the vehicle is provided. It can be easily configured. As a result, the wireless power feeding system has an effect that it is possible to improve the mounting workability to the vehicle.

FIG. 1 is a schematic configuration diagram illustrating a schematic configuration of a wireless power feeding system according to an embodiment. FIG. 2 is a schematic diagram for explaining a coil angle shift in the wireless power feeding system according to the embodiment. FIG. 3 is a diagram illustrating an example of a relationship between coil angle deviation and efficiency in the wireless power feeding system according to the embodiment. FIG. 4 is a schematic configuration diagram illustrating a schematic configuration of a wireless power feeding system according to a modification.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment]
FIG. 1 is a schematic configuration diagram illustrating a schematic configuration of a wireless power feeding system according to an embodiment. FIG. 2 is a schematic diagram for explaining a coil angle shift in the wireless power feeding system according to the embodiment. FIG. 3 is a diagram illustrating an example of a relationship between coil angle deviation and efficiency in the wireless power feeding system according to the embodiment.

  A wireless power feeding system 1 according to the present embodiment illustrated in FIG. 1 is a non-contact power feeding system that wirelessly transmits at least a portion when transmitting power from a power source to various electrical devices 44. The wireless power feeding system 1 according to the present embodiment is mounted on a vehicle, wirelessly connects various electrical devices 44 arranged in the vehicle of the vehicle, and performs contactless power transmission. Furthermore, in the wireless power feeding system 1 of the present embodiment, a solar panel 32 as a power source is arranged as a unit together with a power transmission side coil (primary side coil) 34 and the like outside the vehicle of the vehicle. The device 44 is arranged as a unit together with a power receiving side coil (secondary side coil) 42 and the like, and the power from the solar panel 32 is transmitted in a non-contact manner from the power transmitting side coil 34 to the power receiving side coil 42. It is a system which drives the electric equipment 44 provided in.

  Specifically, as shown in FIG. 1, the wireless power feeding system 1 includes a power transmission side board unit 3 in which a solar panel 32 is exposed at least outside the outer shell member 2 of the vehicle, and an outer shell member 2. And a power receiving side board unit 4 provided inside the vehicle. Here, the entire power transmission side board unit 3 is provided on the outer side of the outer shell member 2. The power transmission side board unit 3 includes a power transmission side board 31, a solar panel 32, a power transmission circuit 33, a power transmission side coil 34, a power transmission side magnetic member 35, and the like. The power receiving side substrate unit 4 includes a power receiving side substrate 41, a power receiving side coil 42, a power receiving circuit 43, an electric device 44, a power receiving side magnetic member 45, and the like.

  Here, the outer shell member 2 is an outer surface member disposed on the outermost side in the vehicle. The power transmission side board unit 3 and the power reception side board unit 4 have the outer shell member 2 as a boundary, the power transmission side board unit 3 is arranged outside the vehicle, and the power reception side board unit 4 is arranged inside the car.

  The power transmission side board unit 3 is unitized by mounting a solar panel 32, a power transmission circuit 33, a power transmission side coil 34, and a power transmission side magnetic member 35 on the power transmission side board 31. The power transmission side board 31 is a board on which various components constituting the power transmission side board unit 3 are mounted. The solar panel 32 is a power source in the wireless power feeding system 1 and generates power. The solar panel 32 is configured by interconnecting a plurality of solar cells, and is a device that directly converts light energy into electric power using the photovoltaic effect. The power transmission circuit 33 is electrically connected to the solar panel 32. The power transmission circuit 33 includes an inverter (DC-AC converter) and the like, and converts power from the solar panel 32 from direct current to alternating current. The power transmission side coil 34 is electrically connected to the power transmission circuit 33. The power transmission side coil 34 is supplied with electric power from the solar panel 32 and converted into an alternating current by the power transmission circuit 33. The power transmission side coil 34 transmits the power from the solar panel 32 to the power reception side coil 42. As will be described later, the power transmission side magnetic member 35 is a power transmission side shielding material for suppressing leakage of an electromagnetic field generated when power is transmitted from the power transmission side coil 34 to the power reception side coil 42 in a non-contact manner. It is. For example, ferrite or the like can be used for the power transmission side magnetic member 35.

  The power receiving side substrate unit 4 is unitized by mounting the power receiving side coil 42, the power receiving circuit 43, the electric device 44, and the power receiving side magnetic member 45 on the power receiving side substrate 41. The power receiving side board 41 is a board on which various components constituting the power receiving side board unit 4 are mounted. The power receiving side coil 42 receives the power from the power transmitting side coil 34 in a non-contact manner. The power receiving circuit 43 is electrically connected to the power receiving side coil 42. The power receiving circuit 43 includes a rectifier (AC-DC converter) and the like, and converts the power received by the power receiving coil 42 from an alternating current to a direct current. The electric device 44 is electrically connected to the power receiving circuit 43. The electric device 44 is a device that drives by consuming electric power converted into a direct current by the power receiving circuit 43. The electric device 44 is, for example, an indoor lamp LED lamp (indoor light) provided on the vehicle interior side. In the following description, the electric device 44 is described as being an LED lamp for room lighting, but is not limited thereto. The electric device 44 is driven by consuming electric power inside the vehicle such as a meter / instrumentation device, a drive recorder, a car navigation system, an audio device, a radar, a movable room mirror, an air conditioner, a power window, etc. Any electrical drive unit may be used as long as it is mounted on the power receiving side substrate 41. As will be described later, the power receiving side magnetic member 45 is a power receiving side shielding material for suppressing leakage of an electromagnetic field generated when power is transmitted from the power transmitting side coil 34 to the power receiving side coil 42 in a non-contact manner. It is. For the power receiving side magnetic member 45, for example, ferrite or the like can be used.

  The power transmission side board unit 3 and the power reception side board unit 4 configured as described above are configured such that the power transmission side coil 34 and the power reception side coil 42 face each other with a predetermined interval therebetween, and the power reception side coil 34 receives the power reception side. It is provided at a position where power can be transmitted to the side coil 42. Here, in the power transmission side board unit 3 and the power reception side board unit 4, the power transmission side coil 34 and the power reception side coil 42 face each other with the outer shell member 2 interposed therebetween. The power transmission side board unit 3 is fixed to the outer surface of the outer shell member 2 on the vehicle side. The power receiving side board unit 4 is fixed to the inner side of the outer shell member 2. The power receiving side board unit 4 may be fixed to the inner surface of the outer shell member 2, or may be fixed to other members of the outer shell member 2 on the inner side of the vehicle. In any case, the wireless power feeding system 1 uses the outer shell member 2 as a boundary, the power transmission side board unit 3 is fixed to the outside of the vehicle, and the power reception side board unit 4 is fixed to the inside of the car. The side coil 34 and the power receiving side coil 42 face each other.

  The pair of power transmission side coil 34 and power reception side coil 42 are constituted by, for example, conductor coils wound in a spiral shape, and constitute a pair of non-contact power supply transformers 5 by facing each other in the axial direction. . The contactless power supply transformer 5 can transmit power from the power transmission side coil 34 to the power reception side coil 42 in a noncontact manner by various methods such as an electromagnetic induction method and an electromagnetic field resonance method. Here, the electromagnetic induction method refers to the power receiving side coil 42 from the power transmitting side coil 34 using electromagnetic induction that generates an electromotive force in the power receiving side coil 42 using a magnetic flux generated by passing an alternating current through the power transmitting side coil 34 as a medium. This is a method for transmitting power to the network. In the electromagnetic field resonance method, an alternating current is passed through the power transmission side coil 34 to resonate the power transmission side coil 34 and the power reception side coil 42 at a specific frequency, and the power transmission side coil is resonated using the resonance phenomenon of the electromagnetic field. In this method, power is transmitted from 34 to the power receiving coil 42.

  More specifically, in the non-contact power supply transformer 5, when power is transmitted from the power transmission side coil 34 to the power reception side coil 42, the power transmission side coil 34 and the power reception side coil 42 face each other with an interval therebetween in the axial direction. In this state, the direct current from the solar panel 32 is converted into an alternating current having an arbitrary frequency via the power transmission circuit 33 and the like, and supplied to the power transmission side coil 34 (for example, the resonance frequency is adjusted to the drive frequency of the inverter). ). In the non-contact power supply transformer 5, when an alternating current is supplied to the power transmission side coil 34, for example, the power transmission side coil 34 and the power reception side coil 42 are electromagnetically coupled, and the power from the power transmission side coil 34 is electromagnetic induction or The power is received by the power receiving coil 42 in a non-contact manner by electromagnetic resonance. The electric power received by the power receiving side coil 42 is converted from an alternating current to a direct current through the power receiving circuit 43 or the like and used by the electric device 44.

  In the wireless power feeding system 1 configured as described above, the solar panel 32, the power transmission circuit 33, the power transmission side coil 34, and the like that are power sources are integrated to form the power transmission side board unit 3, and the power reception side coil 42, the power reception circuit 43, the electric power supply destination electrical device 44 and the like constitute the power receiving side substrate unit 4 in an integrated manner, so that the mounting workability can be improved. That is, the wireless power feeding system 1 includes the unitized power transmission side board unit 3 on the outer side of the outer shell member 2, and the unitized power reception side board unit 4 on the inner side of the outer shell member 2. By providing the coil 34 and the power receiving side coil 42 so as to face each other, a power supply system to the electric device 44 inside the vehicle can be easily configured.

  The wireless power feeding system 1 performs the non-contact power transmission by the power transmission side coil 34 and the power reception side coil 42 in the power transmission path from the solar panel 32 to the electric device 44, so that the solar panel 32 that is a power source Wiring, connectors, harnesses and the like with the electric equipment 44 that is the power supply destination can be reduced as much as possible. Thereby, the wireless power feeding system 1 can reduce the wiring between the solar panel 32 that is a power source and the electric device 44 that is a power supply destination as much as possible, for example, can suppress the number of components. Problems due to wire breakage and the like can be suppressed. Furthermore, the wireless power feeding system 1 can reduce the wiring and the like between the solar panel 32 as a power source and the electric device 44 as a power supply destination as much as possible. The number of work steps in the incidental work can be reduced, and restrictions on the mounting position of the electric equipment 44 can be relaxed. Therefore, also in these points, the wireless power feeding system 1 can improve the mounting workability.

  In the wireless power supply system 1, for example, when the electric device 44 is an LED lamp for indoor lighting as described above, the light irradiation direction may be arbitrarily changed within a predetermined range. . That is, the electrical device 44 may be able to arbitrarily change the installation angle within a predetermined range. In this case, the power receiving side board unit 4 can change the relative angle with respect to the power transmitting side board unit 3 by integrating the power receiving side coil 42, the power receiving circuit 43, the electrical device 44, and the power receiving side board 41. The power-receiving-side board unit 4 is supported via, for example, a rotation / swing support unit including a hinge and the like, and the whole of the power-receiving side board unit 4 swings within a predetermined angle range, thereby setting the installation angle of the electric device 44. For example, the light irradiation direction can be arbitrarily changed within a predetermined range.

  Even in this case, the wireless power feeding system 1 performs non-contact power transmission by the power transmission side coil 34 and the power reception side coil 42 in the power transmission path from the solar panel 32 to the electric device 44. For example, it is possible to prevent the electric power transmission path from being cut off without causing the electric wire or the like to the electric device 44 to repeatedly expand and contract in connection with the swinging operation.

  At this time, the wireless power feeding system 1 is configured such that the power receiving side board unit 4 swings in accordance with the change in the installation angle of the electrical equipment 44 (in this case, the change in the light irradiation direction). The angle of the power receiving side coil 42 of the power receiving side substrate unit 4 changes with respect to the power transmitting side coil 34.

  Here, FIG. 3 illustrates an example of the relationship between the coil angle deviation θ shown in FIG. 2 and the efficiency. As shown in FIG. 2, the coil angle deviation θ refers to the reference position with the power receiving side coil 42 (see the left side in FIG. 2) when the power transmitting side coil 34 and the power receiving side coil 42 are facing each other as a reference position. The inclination angle of the power receiving side coil 42 with respect to the radial direction of the power receiving side coil 42 at the position (the direction orthogonal to the axial direction (the direction in which the power transmitting side coil 34 and the power receiving side coil 42 face each other)) (see the right side in FIG. 2) It corresponds to. When the power transmission side coil 34 and the power reception side coil 42 are facing each other, the coil angle deviation θ = 0 °. 3 shows that the diameter of the power transmission side coil 34 and the power reception side coil 42 is about 50 mm, and the distance between the coils (transmission distance) in the state where the power transmission side coil 34 and the power reception side coil 42 face each other is about 30 mm. This case is shown as an example. In FIG. 3, the horizontal axis represents coil angle θ (°), and the vertical axis represents efficiency (%).

  As shown in FIG. 3, the wireless power feeding system 1 has a limited efficiency drop if the coil angle deviation θ is within a predetermined range, here, a range of about ± 30 °. It is clear that there is no problem. In the wireless power feeding system 1, when the coil angle deviation θ in FIG. 2 increases, the projected area in the plane orthogonal to the opposing direction of each coil tends to decrease, so the transmission efficiency tends to decrease. Under the condition that the inter-coil distance is relatively short in the first place, the inter-coil distance becomes relatively close in accordance with the coil angle deviation θ, and there is a portion where transmission efficiency is improved. As a result, in the wireless power feeding system 1, if the coil angle deviation θ is within a predetermined range, the reduction in the transmission efficiency due to the reduction in the projection area and the improvement in the transmission efficiency due to the approaching distance between the coils are offset. The decrease can be suppressed. Therefore, in the wireless power feeding system 1, the power receiving side board unit 4 is integrated with the power receiving side coil 42, the electric device 44, and the like in order to change the installation angle of the electric device 44 and change the light irradiation direction within a predetermined range. Even when the relative angle with respect to the power transmission side board unit 3 is changed within a predetermined range, it is possible to appropriately supply electric power to the electric device 44 and drive the electric device 44.

  The operation for causing the electrical device 44 to perform a predetermined operation (for example, on / off operation) is performed by, for example, an existing wireless communication technology (for example, NFC (Near Field Communication), Bluetooth (registered trademark), Wi-Fi). By using Fi (Wireless Fidelity), ZigBee (registered trademark), infrared communication, or the like), it is possible to support wirelessly.

  According to the wireless power feeding system 1 described above, the power transmission side board unit 3 and the power reception side board unit 4 are provided. The power transmission side board unit 3 is supplied with a solar panel 32 that generates power, a power transmission circuit 33 that converts the power from the solar panel 32 from a direct current into an alternating current, and power that is converted into an alternating current by the power transmission circuit 33. The power transmission side coil 34 is mounted on the power transmission side substrate 31, and the solar panel 32 is exposed and provided at least on the vehicle outer side of the outer shell member 2 of the vehicle. The power receiving side substrate unit 4 includes a power receiving side coil 42 that receives power from the power transmitting side coil 34 in a non-contact manner, a power receiving circuit 43 that converts power received by the power receiving side coil 42 from an alternating current to a direct current, and a power receiving circuit. An electric device 44 that consumes the electric power converted into a direct current by 43 and is driven is mounted on the power receiving side substrate 41 and provided on the inner side of the outer shell member 2. The power transmission side board unit 3 and the power reception side board unit 4 are provided at positions where the power transmission side coil 34 and the power reception side coil 42 face each other and power can be transmitted from the power transmission side coil 34 to the power reception side coil 42. . Therefore, the wireless power feeding system 1 includes the power transmission side board unit 3 in which the solar panel 32, the power transmission circuit 33, and the power transmission side coil 34, which are power supplies, are unitized on the vehicle exterior side of the outer shell member 2, the power reception side coil 42, the power reception circuit. 43, by providing the power receiving side board unit 4 in which the electric device 44 as a power supply destination is unitized inside the outer shell member 2 so that the power transmitting side coil 34 and the power receiving side coil 42 face each other. A power supply system to the inner electrical device 44 can be easily configured. As a result, the wireless power feeding system 1 can improve the workability of attachment to the vehicle.

  The wireless power feeding system according to the above-described embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims.

  FIG. 4 is a schematic configuration diagram illustrating a schematic configuration of a wireless power feeding system according to a modification.

  The wireless power feeding system 1 according to the modification shown in FIG. 4 is further provided with a battery 46 as a power storage device. In the power receiving side substrate unit 4, a battery 46 is mounted on the power receiving side substrate 41 together with the power receiving side coil 42, the power receiving circuit 43, the electric device 44, and the like. The battery 46 stores the power received by the power receiving side coil 42 and is a secondary battery capable of storing the power. The battery 46 is electrically connected to the power receiving circuit 43, is charged by the power received by the power receiving side coil 42, and supplied through the power receiving circuit 43, and stores the power. The electric power stored in the battery 46 is used for operating the electric device 44. In this case, similarly to the above, the wireless power feeding system 1 can improve the mounting workability to the vehicle, and also stores the electric power from the solar panel 32 in the battery 46 and uses it in the electric device 44. Therefore, convenience can be improved.

  In the above description, the power transmission side board unit 3 and the power reception side board unit 4 are arranged such that the power transmission side board unit 3 is arranged outside the vehicle with the outer shell member 2 as a boundary, and the power reception side board unit 4 is inside the car. Although described as being disposed, the power transmission side board unit 3 only needs to be provided with the solar panel 32 exposed at least on the vehicle exterior side of the outer shell member 2.

DESCRIPTION OF SYMBOLS 1 Wireless power supply system 2 Outer shell member 3 Power transmission side board unit 4 Power reception side board unit 5 Non-contact power supply transformer 31 Power transmission side board 32 Solar panel 33 Power transmission circuit 34 Power transmission side coil 35 Power transmission side magnetic member 41 Power reception side board 42 Power reception side Coil 43 Power receiving circuit 44 Electric device 45 Power receiving side magnetic member 46 Battery (power storage device)

Claims (2)

A solar panel that generates power, a power transmission circuit that converts power from the solar panel from direct current to alternating current, and a power transmission side coil that is supplied with power converted into alternating current by the power transmission circuit is provided on the power transmission side substrate A power transmission side board unit that is mounted and provided with the solar panel exposed at least outside the outer shell member of the vehicle;
A power receiving side coil that receives power from the power transmitting side coil in a contactless manner, a power receiving circuit that converts power received by the power receiving side coil from an alternating current to a direct current, and power that has been converted to a direct current by the power receiving circuit An electric device to be driven and consumed is mounted on the power receiving side board, and includes a power receiving side board unit provided on the inner side of the outer shell member,
The power transmission side board unit and the power reception side board unit are provided at a position where the power transmission side coil and the power reception side coil face each other and transmit power from the power transmission side coil to the power reception side coil.
The electrical device is a room light for indoor lighting of the vehicle,
The power receiving side board unit is provided on the inner surface of the outer shell member, and the power receiving side coil, the power receiving circuit, the indoor lamp as the electric device, and the power receiving side board are integrated into the power transmission side. The light irradiation direction of the indoor lamp can be changed by changing the relative angle with respect to the side substrate unit ,
Wireless power supply system. The power receiving side substrate unit is further mounted on the power receiving side substrate with a power storage device that stores power received by the power receiving side coil.
The wireless power feeding system according to claim 1.

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