JP2013121258A - Non contact power transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non contact power transmission apparatus which preferably adjusts the axial relative relation of coils.SOLUTION: A non contact power transmission apparatus includes: a power transmission device 13; and a power reception device 23. The power transmission device 13 includes a primary side coil 13a wound around a primary side ferrite core 31. The power reception device 23 includes a secondary side coil 23a wound around the secondary side ferrite core 32. The primary side ferrite core 31 rotates so that a primary side axial direction D1, which is the axial direction of the primary side coil 13a, and a secondary side axial direction D2, which is the axial direction of the secondary side coil 23a, are arranged parallel to each other.

Description

  The present invention relates to a non-contact power transmission apparatus.

  2. Description of the Related Art Conventionally, as a non-contact power transmission device that does not use a power cord or a power transmission cable, for example, a device using magnetic field resonance is known. For example, the non-contact power transmission device of Patent Document 1 includes a power supply device provided with an AC power source and a primary resonance coil to which AC power is input from the AC power source. The non-contact power transmission apparatus includes a secondary resonance coil that is provided in a vehicle and capable of magnetic field resonance with the primary resonance coil. Then, AC power is transmitted from the power supply device to the vehicle by magnetic resonance between the primary side resonance coil and the secondary side resonance coil. The transmitted AC power is rectified by a rectifier provided in the vehicle and input to the battery.

JP 2009-106136 A

  The transmission efficiency in the non-contact power transmission apparatus as described above varies depending on the relative relationship in the axial direction of each resonance coil. For this reason, transmission efficiency falls depending on the relative relationship of the axial direction of each resonance coil. However, the act of accurately aligning the vehicle is troublesome. Further, for example, when the direction of the axial direction of each resonance coil differs depending on the specifications of the vehicle or the power supply device, it may be difficult to perform alignment itself.

  In addition, said situation is not restricted to what transmits electric power by magnetic field resonance, The same is applied also to what transmits electric power by electromagnetic induction. The same applies to power transmission to other devices, not limited to vehicles.

  The present invention has been made in view of the above-described circumstances, and suitably adjusts the relative relationship in the axial direction of each coil in a configuration in which contactless power transmission is performed using a primary coil and a secondary coil. An object of the present invention is to provide a non-contact power transmission device that can be used.

  In order to achieve the above object, an invention according to claim 1 is directed to an AC power source, a primary side coil wound around a primary side core and receiving AC power from the AC power source, and a secondary side core. And rotating at least one of the primary side core and the secondary side core by rotating the secondary side coil that can receive the AC power from the primary side coil, And changing means for changing a relative relationship between the axial direction and the axial direction of the secondary coil.

  According to this invention, when at least one of the primary side coil and the secondary side coil is rotated by the changing means, the relative relationship in the axial direction of each coil is changed. Thereby, the relative relationship of the axial direction of each coil can be adjusted so that transmission efficiency may become high. Accordingly, it is possible to cope with the positional deviation between the primary side coil and the secondary side coil, and it is also possible to deal with the difference in the axial direction of each coil according to the specification.

  According to a second aspect of the present invention, the changing means is configured so that the axial direction of the primary side coil and the secondary side core of the primary side coil and the secondary side core are close to each other so that the axial direction of the primary side coil and the axial direction of the secondary side coil approach parallel. At least one of them is rotated. Compared to the case where the axial direction of each coil is orthogonal, the energy of the primary coil can be absorbed more by the secondary coil when the axial direction of each coil is parallel. Increases efficiency. In this regard, according to the present invention, since the relative relationship in the axial direction of each coil is changed to the side with higher transmission efficiency, high transmission efficiency can be realized.

  Here, focusing on the point of transmission efficiency, a configuration in which the coils are arranged side by side on the same axis is also conceivable. However, in order to arrange the coils on the same axis, high-precision alignment is required. For this reason, the alignment is complicated. However, in the configuration in which guide means for performing highly accurate alignment is provided, there is a concern that the configuration is complicated. In addition, due to the space for installing the primary side coil and the secondary side coil, the cores may not be arranged so that the coils can be arranged on the same axis.

  On the other hand, in the configuration in which the axial directions of the coils are parallel, the transmission efficiency is lower than in the configuration in which the coils are aligned on the same axis, but the primary coil and the secondary coil Some misalignment is allowed. Thereby, alignment with a primary side coil and a secondary side coil can be made easy, ensuring comparatively high transmission efficiency. Moreover, even if the coils cannot be arranged on the same axis because of space, a relatively high transmission efficiency can be realized.

  According to a third aspect of the present invention, the primary side core and the secondary side core are formed in a plate shape, and the primary side coil includes an axial direction of the primary side coil and the primary side core. The secondary coil is wound so that the direction perpendicular to the plate thickness direction matches the axial direction of the secondary coil and the direction perpendicular to the plate thickness direction of the secondary core. The changing means rotates at least one of the primary side core and the secondary side core along a direction orthogonal to the plate thickness direction. According to this invention, it is not necessary to secure a space for rotation in the thickness direction of the core to be rotated. Thereby, in the structure which rotates at least one of each core, space saving of the plate | board thickness direction of the core used as rotation object can be achieved.

  The relative relationship in the axial direction of each coil can be suitably adjusted.

It is a block diagram which shows the electrical constitution of the non-contact electric power transmission apparatus which concerns on this invention. (A) is the model top view which showed the vehicle and the parking space typically, (b) is the longitudinal cross-sectional view in the AA of (a). (A), (b) is a schematic plan view for demonstrating operation | movement of a non-contact electric power transmission apparatus in normal parking. (A), (b) is a schematic plan view for demonstrating operation | movement of the non-contact electric power transmission apparatus when the vehicle is parked diagonally. (A), (b) is a longitudinal cross-sectional view which shows the modification of a non-contact electric power transmission apparatus.

  Hereinafter, an embodiment in which a non-contact power transmission apparatus according to the present invention is applied to a vehicle will be described with reference to FIGS. 2 to 4, the horizontal plane is defined by the X and Y directions orthogonal to each other, and the vertical direction orthogonal to the horizontal plane is defined by the Z direction. Further, it is assumed that the X direction coincides with the north-south direction, and the Y direction coincides with the east-west direction.

  As shown in FIG. 1, the non-contact power transmission device 10 includes a ground-side device 11 provided in a ground parking space S and a vehicle-side device 21 mounted on a vehicle C. The ground side device 11 corresponds to a primary side (power feeding side) device, and the vehicle side device 21 corresponds to a secondary side (power receiving side) device.

  The ground-side device 11 includes a high-frequency power source 12 and a power transmitter 13 that can output high-frequency power of a predetermined frequency. The power transmitter 13 is electrically connected to the high frequency power source 12, and high frequency power is input to the power transmitter 13 from the high frequency power source 12. The vehicle-side device 21 includes a vehicle battery 22 and a power receiver 23 that can receive high-frequency power from the power transmitter 13.

  The power transmitter 13 and the power receiver 23 are configured to be capable of magnetic field resonance. Specifically, the power transmitter 13 includes a resonance circuit including a primary coil 13a and a primary capacitor 13b connected in parallel. The power receiver 23 is composed of a resonance circuit including a secondary coil 23a and a secondary capacitor 23b connected in parallel. Both resonance frequencies are set to be the same.

  The vehicle side device 21 is provided with a rectifier 24, and the vehicle battery 22 is connected to the power receiver 23 via the rectifier 24. The rectifier 24 rectifies the high frequency power received by the power receiver 23 into DC power. The DC power rectified by the rectifier 24 is input to the vehicle battery 22.

  The ground side device 11 is provided with a power source side controller 14 for controlling the high frequency power source 12. The vehicle-side device 21 is provided with a vehicle-side controller 25 configured to be able to perform wireless communication with the power supply-side controller 14. Therefore, the controllers 14 and 25 can exchange information wirelessly.

  When the vehicle controller 25 is parked (stopped) at a position where the vehicle C can be charged, in detail, the power transmitter 13 (primary coil 13a) and the power receiver 23 (secondary coil 23a) can perform magnetic field resonance. When the vehicle C is parked at the correct position, a chargeable signal is transmitted to the power supply controller 14. When the power supply side controller 14 receives the chargeable signal, the power supply side controller 14 starts the charging after executing the process of aligning the axial directions of the coils 13a and 23a. Specifically, the power supply side controller 14 controls the high frequency power supply 12 to output high frequency power. Thereby, magnetic field resonance occurs between the power transmitter 13 and the power receiver 23, and the power receiver 23 receives a part of the energy of the power transmitter 13. That is, the power receiver 23 (secondary coil 23a) receives high-frequency power from the power transmitter 13 (primary coil 13a). The received high-frequency power is rectified by the rectifier 24 and input to the vehicle battery 22.

Next, the structure for aligning the axial direction of each coil 13a, 23a is demonstrated with the detailed structure of each coil 13a, 23a.
As shown in FIG. 2, the primary coil 13 a includes a primary ferrite core 31 formed in a plate shape, specifically a square shape, and an axial direction D <b> 1 of the primary coil 13 a (hereinafter simply referred to as a primary side). (Referred to as the axial direction D1) and the direction perpendicular to the plate thickness direction of the primary ferrite core 31 is wound. The secondary coil 23a includes a secondary ferrite core 32 formed in a square shape, an axial direction D2 of the secondary coil 23a (hereinafter simply referred to as a secondary axial direction D2), and a secondary ferrite core 32. The sheet thickness direction and the direction orthogonal to each other are wound and configured. The ferrite cores 31 and 32 are formed in the same shape.

  As shown in FIG. 2, the ground device 11 is provided with a table 33 on which the primary ferrite core 31 is installed. As shown in FIG. 2A, the table 33 is formed in a disc shape, and the upper and lower surfaces thereof are formed flat. The diameter L1 of the table 33 is set to be smaller than the vehicle width of the vehicle C, specifically, the interval L2 between the pair of left and right tires C1 of the vehicle C.

  As shown in FIG. 2B, the table 33 is arranged horizontally, and the lower surface of the table 33 is in contact with the ground. The primary ferrite core 31 is installed in a state where a lower surface, which is a surface extending in the primary axial direction D <b> 1, is in contact with the upper surface of the table 33. And both are being fixed in that state using fixing tools (illustration omitted), such as a screw. For this reason, the primary side ferrite core 31 is arranged so that surfaces (upper surface and lower surface (hereinafter referred to as surface)) extending in the primary axial direction D1 are horizontal.

  Further, as shown in FIG. 2B, the secondary ferrite core 32 of the power receiver 23 has a surface (upper surface and lower surface (hereinafter referred to as a surface)) extending in the secondary axial direction D2 that is horizontal. It is fixed to the vehicle C. For this reason, the surfaces of the ferrite cores 31 and 32 are substantially parallel to each other. That is, the ferrite cores 31 and 32 are arranged so that the plate thickness directions are in the same direction. In other words, as shown by a two-dot chain line in FIG. 2B, when the ferrite cores 31 and 32 are arranged to face each other in the Z direction, the surfaces of the ferrite cores 31 and 32 face each other.

  As shown in FIG. 2A, the parking space S is formed with a pair of guide lines S <b> 1 (white lines) that define the relative position of the vehicle C with respect to the parking space S. The pair of guide lines S1 extends in the Y direction. In addition, the pair of guide lines S1 are formed in the X direction so as to be spaced apart at an interval larger than the vehicle width of the vehicle C. According to this configuration, the driver of the vehicle C matches the direction in which the pair of guide lines S1 extends (Y direction) and the entire length direction of the vehicle C (the front-rear direction of the vehicle C), and between the pair of guide lines S1. It is assumed that the vehicle C is parked so that the vehicle C can be accommodated. In the following description, parking in a mode in which the direction in which the pair of guide lines S1 extends and the total length direction of the vehicle C coincide with each other is also referred to as normal parking. Parking in an inclined manner is also called oblique parking.

  Incidentally, in this embodiment, as shown in FIG. 2, the axial direction of the primary side coil 13a and the secondary side coil 23a is different in the normal parking. Specifically, as shown in FIG. 2A, the primary axial direction D1 coincides with the direction (X direction) corresponding to the vehicle width direction in the parking space S. The secondary axial direction D2 coincides with the full length direction (Y direction) of the vehicle C. That is, each axial direction D1, D2 is orthogonal.

  The state where the primary side axial direction D1 is arranged so as to coincide with the X direction (east-west direction) is the initial state of the primary side ferrite core 31. That is, the initial orientation of the primary ferrite core 31 in the power transmitter 13 (the initial direction of the primary axial direction D1) is determined in advance.

  As shown in FIG. 2B, a protrusion 33a is provided at the center of the lower surface of the table 33, and a rotary motor 34 is connected to the protrusion 33a. As the rotary motor 34 rotates, the table 33 rotates around the protrusion 33a, and the primary ferrite core 31 rotates along the surface, that is, along the direction orthogonal to the plate thickness direction. In this case, the primary ferrite core 31 has only one rotation axis.

  The rotation motor 34 is composed of a stepping motor. As shown in FIG. 1, the power supply side controller 14 controls the rotary motor 34 by controlling the number of pulse signals. Thereby, the power supply side controller 14 can grasp | ascertain how much the table 33 rotated.

In addition, although illustration is abbreviate | omitted, the wiring which connects the power transmission device 13 and the high frequency power supply 12 is formed sufficiently long, and does not inhibit rotation of the primary side ferrite core 31. FIG.
Next, a configuration related to detection of the relative relationship between the axial directions D1 and D2 and a configuration related to control using the detection result will be described.

  As shown in FIG. 1, the vehicle-side device 21 of the vehicle C is provided with a direction detection sensor 35 that detects the direction of the vehicle C. The direction detection sensor 35 is composed of, for example, a gyroscope, and detects the direction in which the vehicle C is facing, specifically, the angle in the traveling direction of the vehicle C with reference to the north. The direction detection sensor 35 transmits the detection result to the vehicle-side controller 25 every time the direction of the vehicle C changes. Thereby, the vehicle side controller 25 can detect the direction of the vehicle C, that is, which direction the vehicle C is facing.

  Here, as shown in FIG. 2A, the secondary ferrite core 32 is fixed to the vehicle C so that the secondary axial direction D2 coincides with the full length direction of the vehicle C. That is, the relative relationship between the secondary axial direction D2 and the direction of the vehicle C is determined in advance. As shown in FIG. 1, the vehicle-side controller 25 grasps the secondary axial direction D <b> 2 based on the detection result of the direction detection sensor 35. Specifically, the vehicle-side controller 25 grasps the angle of the secondary axial direction D2 with respect to the north direction (Y direction). And the vehicle side controller 25 transmits the grasping | ascertainment result (angle information of the secondary side axial direction D2 with respect to the north direction) to the power supply side controller 14 with a chargeable signal via wireless communication. Thereby, it is possible for the power supply side controller 14 to grasp the secondary axial direction D2.

  When the power supply side controller 14 receives information on the secondary side axial direction D2 from the vehicle side controller 25 together with the chargeable signal, specifically, angle information on the secondary side axial direction D2 with respect to the north direction, each axial direction D1, D2 Grasp the relative relationship of Here, as already described, the initial orientation of the primary ferrite core 31 is determined in advance. The power supply side controller 14 calculates the angle formed in each axial direction D1, D2 based on the angle information in the secondary axial direction D2 and the initial orientation of the primary ferrite core 31.

  Then, it is determined whether or not the calculated angle is “0”, that is, whether each of the axial directions D1 and D2 is parallel. If the calculated angle is not “0”, both angles are “0”. The rotation angle of the table 33 (primary side ferrite core 31) required for this is calculated. Thereafter, the rotation motor 34 is controlled so that the table 33 rotates by the rotation angle. The power supply side controller 14 controls the high frequency power supply 12 so that the high frequency power is outputted when the angle between the two is “0” or when the angle between the both becomes “0” by rotating the table 33. .

  Incidentally, although not shown in the figure, the ground device 11 is provided with a mechanism for rotating the table 33 to a position where the orientation of the primary ferrite core 31 becomes the initial orientation. When the vehicle C moves out of the chargeable range, the power supply side controller 14 drives the mechanism so that the orientation of the primary ferrite core 31 is the initial orientation. Thereby, since the orientation of the primary side ferrite core 31 at the time of non-charging maintains the initial azimuth | direction, whenever the vehicle C is arrange | positioned in the position which can be charged, the angle made in each axial direction D1, D2 is grasped | ascertained correctly. It is possible to do. Further, it is possible to simplify the control as much as it is not necessary to know the orientation of the primary ferrite core 31 after the end of charging.

  Note that, as described above, the present invention is not limited to a configuration in which a mechanism for rotating the table 33 is provided at a position where the orientation of the primary ferrite core 31 is the initial orientation. For example, the rotation amount of the rotary motor 34 at the time of charging is stored. In addition, it may be configured to reversely rotate by the amount of rotation.

  A series of operations in the non-contact power transmission apparatus 10 of the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3A shows a case where the axial directions D1 and D2 are orthogonal to each other in a situation where the vehicle C is normally parked, and FIG. 4A shows a case where the vehicle C is parked obliquely. . For convenience of drawings, in FIGS. 3 and 4, the vehicle C and each component provided in the vehicle C are indicated by a two-dot chain line.

  As shown in FIG. 3A, when the vehicle C is arranged at a chargeable position, specifically, at a position where the secondary ferrite core 32 faces the primary ferrite core 31, a chargeable signal is transmitted. And information on the secondary axial direction D2 is transmitted. Then, an angle formed by each axial direction D1, D2 is calculated, and it is determined whether each axial direction D1, D2 is parallel. In this case, since each axial direction D1, D2 is orthogonal when viewed from above, the table 33 rotates so that each axial direction D1, D2 is parallel. As the table 33 rotates, the primary ferrite core 31 rotates. Thereby, as shown in FIG.3 (b), each axial direction D1, D2 becomes parallel. Thereafter, charging is started. That is, when the primary side axial direction D1 is inclined by a predetermined angle with respect to the secondary side axial direction D2 in a situation where the vehicle C is normally parked, the primary side ferrite core 31 is inclined by the predetermined angle. , The axial directions D1 and D2 become parallel.

  As shown in FIG. 3, since the diameter L1 of the table 33 is set to be smaller than the distance L2 between the pair of left and right tires C1 of the vehicle C, the vehicle C is positioned at a position where the ferrite cores 31 and 32 face each other. In a parked situation, the pair of tires C1 does not get on the table 33. Thereby, the rotation of the table 33 is not inhibited by the vehicle C.

  As shown to Fig.4 (a), when the vehicle C is parked diagonally, each axial direction D1, D2 is not parallel but has shifted | deviated. Even in this case, as described above, the angle formed by the axial directions D1 and D2 is calculated, and the table 33 rotates so that the axial directions D1 and D2 are parallel to each other. That is, when the vehicle C is parked normally, when the vehicle C is diagonally parked in a configuration in which the axial directions D1 and D2 are parallel, the primary ferrite core 31 rotates by the angle of the diagonal parking. .

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) By rotating the primary side ferrite core 31, it was set as the structure which changes the relative relationship of each axial direction D1, D2. Thereby, irrespective of the relative position of the secondary side coil 23a (vehicle C) with respect to the primary side coil 13a (parking space S), adjusting the relative relationship of each axial direction D1, D2 so that transmission efficiency may become high. Can do. Therefore, while being able to respond suitably to the position shift of the secondary side coil 23a with respect to the primary side coil 13a, it is a case where each axial direction D1, D2 differs with the specification of the vehicle C or the specification of the parking space S. Can also be suitably handled.

  That is, for example, when the installation direction of the power receiver 23 (secondary coil 23a) is changed according to the specification of the vehicle C, the secondary axial direction D2 is changed accordingly. In this case, even when the vehicle C is normally parked, the cases where the axial directions D1 and D2 are different may occur. Further, even if the axial directions D1 and D2 are set to have a desired relative relationship when the vehicle C is normally parked, the axial directions D1 and D2 are set when the vehicle C is parked obliquely. Does not satisfy the desired relative relationship.

  On the other hand, according to the present embodiment, the current secondary side axial direction D2 is grasped, and the primary side ferrite core 31 (table 33) is rotated based on the grasped result, whereby the primary side It was set as the structure which adjusts the axial direction D1. Thereby, it is possible to set the axial directions D1 and D2 in a desired relative relationship regardless of the difference in specifications and the parking mode of the vehicle C as described above.

  (2) In the secondary side coil 23a, the direction of the magnetic field generated in the primary side coil 13a is greater when the axial directions D1 and D2 are parallel than when the axial directions D1 and D2 are orthogonal to each other. Easy to react to changes. That is, the primary side coil 13a and the secondary side coil 23a are more strongly coupled when the axial directions D1 and D2 are parallel. In this regard, according to the present embodiment, the primary ferrite core 31 is rotated so that the axial directions D1 and D2 approach parallel. Thereby, the high frequency power received by the power receiver 23 (secondary coil 23a) is increased, and the transmission efficiency is improved. Therefore, transmission efficiency can be improved.

  Here, focusing on the point of transmission efficiency, a configuration in which the coils 13a and 23a are arranged side by side on the same axis is also conceivable. However, in order to arrange the coils 13a and 23a on the same axis, it is necessary to adjust the parking position of the vehicle C with respect to the parking space S with high accuracy. For this reason, the burden on the driver increases, and parking becomes troublesome. However, it is not preferable to provide the parking space S and the vehicle C with a configuration for performing high-accuracy adjustment such as a high-accuracy GPS or an image sensor from the viewpoint of complication of the configuration and cost. Further, due to the installation space of the power receiver 23 in the vehicle C and the installation space of the power transmitter 13 in the parking space S, the ferrite cores 31 and 32 are installed so that the coils 13a and 23a can be arranged on the same axis. You may not be able to.

  On the other hand, in the configuration in which the axial directions D1 and D2 are parallel to each other, although the transmission efficiency is reduced as compared with the configuration in which the coils 13a and 23a are arranged on the same axis, each coil 13a. , 23a, that is, the positional deviation of the secondary coil 23a with respect to the primary coil 13a is allowed to some extent. Thereby, alignment with the primary side coil 13a and the secondary side coil 23a can be made easy, ensuring comparatively high transmission efficiency. In addition, relatively high transmission efficiency can be realized even when the coils 13a and 23a cannot be arranged on the same axis because of space.

  (3) The primary side coil 13a is formed by being wound around a plate-like primary side ferrite core 31. The primary side ferrite core 31 is arranged along a direction (surface) orthogonal to the plate thickness direction. It was set as the structure rotated. Thereby, it is not necessary to ensure the space for the primary side ferrite core 31 to rotate in the plate | board thickness direction (direction orthogonal to the surface) of the primary side ferrite core 31. FIG. Thereby, space saving in the plate | board thickness direction of the primary side ferrite core 31 can be achieved.

  In particular, in the present embodiment, the plate-like ferrite cores 31 and 32 are installed so that the surfaces thereof are horizontal so that the space of the vehicle C and the parking space S are relatively unobtrusive. In this case, when the primary side ferrite core 31 is rotated with the primary side axial direction D1 as the central axis, it is necessary to avoid interference between the primary side ferrite core 31 and the ground, and there is a concern that the configuration may be complicated. Is done. Further, when rotating as described above, there is concern about the interference between the vehicle C and the primary ferrite core 31, and it is necessary to increase the vehicle height in order to avoid the interference.

  On the other hand, according to the present embodiment, by adopting a configuration in which the ferrite cores 31 and 32 are arranged horizontally and rotated along a direction orthogonal to the plate thickness direction of the primary ferrite core 31. There is no need to consider interference with the ground or the vehicle C in the vertical direction. Thereby, the above inconveniences can be avoided.

  (4) The ferrite cores 31 and 32 are arranged so that their surfaces are parallel to each other. In other words, the ferrite cores 31 and 32 are arranged so that the plate thickness directions are in the same direction. Thereby, each axial direction D1, D2 does not face the direction which intersects the surface of each ferrite core 31 and 32. Therefore, by rotating the primary side ferrite core 31 along the direction orthogonal to the plate thickness direction of the primary side ferrite core 31, the axial directions D1 and D2 can be made parallel. That is, only one rotation axis is required for making the axial directions D1 and D2 parallel. Therefore, the configuration can be simplified.

  (5) The non-contact power transmission device 10 is for charging the vehicle battery 22. Specifically, the vehicle-side device 21 mounted on the vehicle C is provided with a vehicle battery 22, and the high-frequency power received by the power receiver 23 is rectified to DC power by the rectifier 24, and the rectification is performed. The configured direct current power is input to the vehicle battery 22. Here, the vehicle battery 22 is required to have a larger storage capacity than a battery such as a mobile phone. For this reason, the electric power which the non-contact electric power transmission apparatus 10 handles is very large compared with what charges batteries, such as the said mobile phone. For this reason, although the amount of change in the transmission efficiency with respect to the change in the relative relationship between the axial directions D1 and D2 is smaller in the power transmission by the magnetic field resonance than the power transmission by the electromagnetic induction, the axial directions D1 and D2 The power loss caused by the change in transmission efficiency accompanying the change in the relative relationship between the two cannot be ignored.

  On the other hand, according to the present embodiment, by changing the relative relationship between the axial directions D1 and D2, power loss that cannot be ignored in the non-contact power transmission apparatus 10 that handles relatively large power can be suppressed. . Thereby, the non-contact electric power transmission apparatus 10 suitable for the vehicle C which can handle large electric power suitably can be provided.

In addition, you may change the said embodiment as follows.
In embodiment, although the power transmission device 13 grade | etc., Was provided in the ground, it is not restricted to this, For example, as shown in FIG. 5, when the wall part 41 is provided in the parking space S, the said wall part 41 may be provided with the power transmitter 13 or the like.

  In the embodiment, the surfaces of the ferrite cores 31 and 32 are parallel to each other. However, the present invention is not limited to this. For example, as shown in FIG. 5, the ferrite cores 31 and 32 may be arranged so that the surfaces of the ferrite cores 31 and 32 are orthogonal to each other. Even in such a configuration, as shown in FIG. 5A, when the axial directions D1 and D2 are not parallel, the table 33 is rotated using the rotary motor 34, and the configuration shown in FIG. As shown, the axial directions D1 and D2 are preferably matched. However, from the viewpoint of improving transmission efficiency, a configuration in which the surfaces of the ferrite cores 31 and 32 are parallel to each other is preferable.

In FIG. 5, the secondary ferrite core 32 may be arranged so that the surface of the primary ferrite core 31 and the surface of the secondary ferrite core 32 are parallel to each other.
Further, the primary ferrite core 31 and the table 33 may be embedded in the ground or the wall portion 41. In this case, the rotation of the table 33 is not hindered by the vehicle C. Moreover, you may provide the housing | casing which accommodates the primary side ferrite core 31 and the table 33, and the vehicle C can ride on.

  In the embodiment, the configuration is such that only the primary ferrite core 31 is rotated. However, the present invention is not limited to this, and the secondary ferrite core 32 may be rotated, or both may be rotated. However, when the secondary ferrite core 32 is rotated, it is necessary to secure a space for installing a configuration for rotating the vehicle C and a space for rotating. For this reason, in view of the fact that the parking space S has more space than the vehicle C, a configuration in which only the primary ferrite core 31 is rotated is better.

  In embodiment, although the table 33 was employ | adopted as a structure which rotates the primary side ferrite core 31, it is not restricted to this. For example, it is good also as a structure which provides a pair of arm holding both ends of the primary side axial direction D1 in the primary side ferrite core 31, and rotates the primary side ferrite core 31 by driving the pair of arms. However, from the viewpoint of simplifying the configuration and securing a space for rotation, the configuration in which the table 33 is rotated on the plane is preferable.

  In the embodiment, charging is performed when the vehicle C is parked. However, the present invention is not limited to this. For example, when the vehicle C is moving for parking, the vehicle C is moving. Alternatively, the battery may be charged. In this case, every time the direction of the vehicle C changes, the vehicle-side controller 25 transmits information on the secondary-side axial direction D2 to the power-side controller 14, and the power-side controller 14 turns the rotary motor 34 on the basis of the information. It may be configured to control. Thereby, it is possible to follow the movement of the vehicle C.

  In the embodiment, the surfaces of the ferrite cores 31 and 32 are parallel to each other. However, the present invention is not limited to this and may be inclined. In other words, when the ferrite cores 31 and 32 are arranged to face each other, the surface extending in the primary-side axial direction D1 and the surface extending in the secondary-side axial direction D2 may be configured to face each other.

  In this case, the primary ferrite core 31 is rotated so that the axial directions D1 and D2 approach parallel. Specifically, the primary ferrite core 31 is rotated along a direction orthogonal to the plate thickness direction of the primary ferrite core 31 so that the axial directions D1 and D2 face the same side. In short, any configuration that rotates from the current state detected by the orientation detection sensor 35 toward a state in which the axial directions D1 and D2 are parallel to each other is sufficient, and if the axial directions D1 and D2 are completely parallel to each other. It does not have to be.

  In the embodiment, the number of rotation axes is one, but the present invention is not limited to this, and a plurality of rotation axes may be provided to realize three-dimensional rotation. In this case, even if the surfaces of the ferrite cores 31 and 32 are not parallel to each other, the axial directions D1 and D2 can be made parallel. In addition, as a structure for implement | achieving three-dimensional rotation, what uses the arm mentioned above, for example can be considered.

  In the embodiment, the ferrite cores 31 and 32 are employed as the cores of the coils 13a and 23a. However, the present invention is not limited to this, and other materials such as NdFeB, samarium cobalt, or AlNiCo may be used.

  In the embodiment, the ferrite cores 31 and 32 are formed in the same shape. However, the shape is not limited to this, and the shapes may be different from each other. Moreover, the shape of each ferrite core 31 and 32 is not restricted to square shape, A rectangular plate shape may be sufficient. Furthermore, the shape of each of the ferrite cores 31 and 32 is not limited to a plate shape, and may be a columnar shape, for example.

  In the embodiment, a gyroscope is used as the direction detection sensor 35, but other sensors may be used as long as the direction can be detected. In short, it is only necessary to be able to detect the relative relationship between the axial directions D1 and D2. For example, the ground-side device 11 is provided with various detection sensors such as an image sensor capable of detecting the secondary axial direction D2. It is good. In this case, it is not necessary to perform communication between the ground side device 11 and the vehicle side device 21.

  In embodiment, although the full length direction of the vehicle C and the secondary side axial direction D2 corresponded, it is not restricted to this, It is good also as a different structure. In this case, the relative relationship between the secondary axial direction D2 and the direction of the vehicle C is grasped in advance, and the secondary relative to the primary axial direction D1 is based on the relative relationship and the detection result of the direction detection sensor 35. The side axis direction D2 may be derived.

  The power transmitter 13 may be separately provided with a primary coupling coil that is coupled with a resonance circuit including the primary coil 13a and the primary capacitor 13b by electromagnetic induction. In this case, the primary side coupling coil and the high frequency power source 12 are connected, and the resonance circuit is configured to receive high frequency power from the primary side coupling coil by electromagnetic induction. Similarly, the power receiver 23 is provided with a secondary side coupling coil that is coupled by electromagnetic induction to a resonance circuit including the secondary side coil 23a and the secondary side capacitor 23b, and the resonance of the power receiver 23 is performed using the secondary side coupling coil. It is good also as a structure which takes out electric power from a circuit.

O The waveform of the AC voltage output from the high-frequency power source 12 is arbitrary, such as a pulse waveform or a sine wave.
O Although the high frequency power supply 12 which outputs high frequency electric power was provided, it is not restricted to this. In short, any AC power source that outputs AC power of a predetermined frequency (for example, 10 kHz to 10 MHz) may be used, and the frequency of the output AC power may be appropriately set in relation to the resonance frequency or the like.

  In the embodiment, the capacitors 13b and 23b are provided, but these may be omitted. In this case, it is preferable to employ a configuration in which magnetic field resonance is performed using the parasitic capacitances of the coils 13a and 23a.

In the embodiment, magnetic field resonance is used to realize non-contact charging. However, the present invention is not limited to this, and electromagnetic induction may be used.
In the embodiment, the high-frequency power received by the power receiver 23 is used to charge the vehicle battery 22 provided in the vehicle C. However, the embodiment is not limited to this. It may be used to drive the electrical components.

In the embodiment, an example in which the present invention is applied to the vehicle C has been described.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

  (A) The primary side core and the secondary side core are arranged such that the plate thickness direction of the primary side core and the plate thickness direction of the secondary side core are oriented in the same direction. The contactless power transmission device according to claim 3.

(B) The first plane extending in the axial direction of the primary coil and the second plane extending in the axial direction of the secondary coil are configured to face each other when the cores are arranged to face each other. And
The changing means includes at least one of first rotating means for rotating the primary core on the first plane and second rotating means for rotating the secondary core on the second plane. The contactless power transmission device according to claim 1, wherein

(C) The primary side coil is provided in a parking space where the vehicle is parked,
The secondary coil is provided in the vehicle,
In the vehicle,
A rectifier that rectifies AC power received by the secondary coil into DC power;
A vehicle battery that is charged when the DC power rectified by the rectifier is input;
The non-contact power transmission device according to any one of claims 1 to 3 and technical ideas (a) and (b).

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission apparatus, 13 ... Power transmitter, 13a ... Primary side coil, 14 ... Power source side controller, 22 ... Vehicle battery, 23 ... Power receiver, 23a ... Secondary side coil, 24 ... Rectifier, 31 ... Primary side ferrite core, 32 ... secondary side ferrite core, 33 ... table, 34 ... rotary motor, 35 ... direction detection sensor.

Claims (3)

AC power supply,
A primary coil wound around a primary core and receiving AC power from the AC power source;
A secondary side coil wound around a secondary side core and capable of receiving the AC power from the primary side coil;
Changing means for changing the relative relationship between the axial direction of the primary coil and the axial direction of the secondary coil by rotating at least one of the primary core and the secondary core;
A non-contact power transmission device comprising:   The changing means rotates at least one of the primary side core and the secondary side core so that the axial direction of the primary side coil and the axial direction of the secondary side coil approach parallel to each other. The non-contact power transmission apparatus according to claim 1. The primary core and the secondary core are formed in a plate shape,
The primary side coil is wound so that an axial direction of the primary side coil and a direction orthogonal to a plate thickness direction of the primary side core coincide with each other,
The secondary coil is wound so that an axial direction of the secondary coil and a direction orthogonal to a plate thickness direction of the secondary core coincide with each other,
The said changing means rotates at least one of the said primary side core and the said secondary side core along the direction orthogonal to the plate | board thickness direction, The Claim 1 or Claim 2 characterized by the above-mentioned. The contactless power transmission device described.