JP6512327B2 - Wireless power supply - Google Patents

Description

  The present invention relates to a noncontact power feeding apparatus according to noncontact power transmission.

  2. Description of the Related Art In recent years, contactless power supply devices to power reception devices (hereinafter, "power reception devices" may be referred to as "power supply objects" in the present specification and claims) contactlessly (physically electrical) Systems have been developed to transmit power without requiring a connection. As a method for non-contact power transmission, a method may be adopted in which a non-contact power feeding device and a power receiving device are provided with a coil module and power is transmitted by an electromagnetic coupling method. By transmitting power without contact, various electronic devices such as a mobile phone, a smartphone, and a tablet terminal can receive power from the contactless power supply device as a power receiving device.

  The non-contact power feeding is generally performed in a state where the power receiving device is mounted on the power feeding surface of the non-contact power feeding device. In order to feed power to the power receiving device with high efficiency, it is necessary that the position of the power feeding element disposed below the feeding surface and the position of the power receiving element included in the power receiving device be matched (face each other across the feeding surface) There is. Therefore, for example, Patent Document 1 discloses a technique that includes a position detection unit that specifies the position of the power reception element, specifies the position of the power reception element by the position detection unit, and performs alignment with the power supply element.

Unexamined-Japanese-Patent No. 2010-283982

  According to Patent Document 1, although the power feeding element and the power receiving element can be aligned, the position detection unit is disposed between the power feeding surface and the power feeding element, and at the time of power feeding, the position detection unit is the power receiving element and the power feeding element. To intervene. The power feeding efficiency is higher as the distance between the power receiving element and the power feeding element is shorter, and the distance between the power receiving element and the power feeding element is increased by interposing the position detection unit, so that the power feeding efficiency is reduced.

  An object of the present invention is to provide a non-contact power feeding device capable of aligning the power receiving element and the power feeding element and not reducing the power feeding efficiency at the time of power feeding.

  In order to achieve the above object, a non-contact power feeding device according to the present invention comprises: a feeding surface on which a feeding target having a power receiving element is placed; a feeding element for feeding power to the receiving element; A first drive unit that supports movably in a region, a position detection unit disposed in a second region separated from the first region to detect the position of the power receiving element, the power feeding surface, and And a second drive unit for moving one of the position detection units.

  Further, in the non-contact power feeding device with the above configuration, it is preferable that the moving direction of the feeding element by the first drive unit and the moving direction of the feeding surface or the position detection unit by the second driving unit are different.

  Further, in the non-contact power feeding device having the above configuration, it is preferable that the second drive unit move the power feeding element together with the position detection unit.

  The noncontact power feeding apparatus having the above configuration includes a case having the circular feed surface and a circular rotary table rotatably supported in the circumferential direction in the case by the second drive unit, It is desirable that the rotary table supports the feed element and the position detection unit.

  Further, in the non-contact power feeding device having the above configuration, it is preferable that the first drive unit movably support the power feeding element in the radial direction of the power feeding surface.

  According to the present invention, since the position detection unit for detecting the position of the power receiving element is provided, the power feeding element and the power receiving element can be aligned. In addition, the first area in which the feed element moves and the second area in which the position detection unit is disposed are separated from each other and do not overlap. Therefore, the position detection unit does not intervene between the feeding element and the feeding surface, and the distance between the feeding element and the receiving element on the feeding surface is short, and the feeding efficiency is not reduced.

1st perspective view which shows an example of a non-contact electric power feeding system First plan perspective view showing an example of a noncontact power feeding system Sectional view along line 100-100 in FIG. 2 Block diagram showing an example of a noncontact power feeding system Flow chart showing the flow of processing executed by the control unit of the non-contact power feeding device in the first embodiment Second plan perspective view showing an example of a noncontact power feeding system 6 is a sectional view taken along the line 200-200 in FIG. The flowchart which shows the flow of the processing which the control section of the non-contact electric supply device executes in 2nd execution form Second perspective view showing an example of a noncontact power feeding system Third plan perspective view showing an example of a noncontact power feeding system Sectional view along line 300-300 in FIG. 10 The flowchart which shows the flow of the processing which the control section of the non-contact electric supply device executes in 3rd execution form Fourth plan perspective view showing an example of a noncontact power feeding system Sectional view along line 400-400 in FIG. 13 The flowchart which shows the flow of the processing which the control section of the non-contact electric power feeder executes in the fourth embodiment Fifth plan perspective view showing an example of a non-contact power feeding system

First Embodiment
Hereinafter, in the present embodiment, the non-contact power feeding device of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of the non-contact power feeding system of the present embodiment. FIG. 2 is a transparent plan view showing an example of the non-contact power feeding system of the present embodiment. FIG. 3 is a cross-sectional view taken along the line 100-100 in FIG. FIG. 4 is a block diagram showing an example of the non-contact power feeding system of the present embodiment. The non-contact power feeding system 1 of the present embodiment includes a non-contact power feeding device 2 and a power receiving device (electronic devices such as a mobile phone, a smartphone, a notebook computer, etc.) 3. The non-contact power feeding device 2 is provided with a housing 2 a internally provided with various configurations for feeding power to the power receiving element 31 of the power receiving device 3, and power feeding disposed above the housing 2 a and the power receiving device 3 is mounted. A surface 2b and a central axis 2c provided substantially at the center of the housing 2a and supporting the feeding surface 2b are provided. In addition, a protrusion P is provided substantially at the center of the feeding surface 2 b, and the power receiving device 3 is not placed on the protrusion P. This is because a feed element 24 described below below the protrusion P can not move.

  The housing 2a and the feeding surface 2b are circular in plan view, and the feeding surface 2b is provided rotatably with respect to the housing 2a around the central axis 2c in the present embodiment. Referring to FIG. 4, a power supply unit 21, a control unit 22, a feed element drive circuit 23, a feed element 24, a first drive unit 25, a position detection unit 26 and a second drive unit 27 are disposed in the housing 2 a. Be done. The power supply unit 21 is supplied with AC power from a commercial power supply (not shown), and the power supply unit 21 supplies a voltage suitable for each configuration of the non-contact power feeding device 2.

  The control part 22 is a control means which controls the non-contact electric power supply 2 whole. In particular, in the present embodiment, the control unit 22 controls driving of a first drive unit 26 and a second drive unit 27 described later. The feed element drive circuit 23 includes a switching circuit (not shown) and the like, and supplies alternating current power to the feed element 24 by turning on and off the DC voltage supplied from the power supply unit 21 when feeding power to the power receiving element 31.

  When AC power is supplied to the feeding element 24, an alternating current flows in the feeding element 24, and an alternating magnetic field is generated in a direction perpendicular to the feeding surface 2b. An induced current is excited in the power receiving element 31 brought close to the power feeding element 24 by this alternating magnetic field, and power is transmitted. The material and shape of the feeding element 24 are not particularly limited, but, for example, a colmodule having a shape in which the vortex is wound toward the center of the spiral in top view is used.

  The first drive unit 25 supplies the electric power supplied from the rotation motor 25 a and the power supply unit 21 to the rotation motor 25 a based on the command from the control unit 22 to rotate the rotation motor 25 a (not shown). 2), two guide shafts 25b extending in parallel from the approximate center of the feeding surface 2b (outside the peripheral edge of the central axis 2c) in the radial direction of the feeding surface 2b, and two parallel guide shafts 25b And a base portion 25 c slidably disposed in the axial direction of the guide shaft 25 b and supporting the feed element 24. The rotary motor 25a applies a driving force to one of the guide shafts 25b. The guide shaft 25b and the base portion 25c are fitted by a male screw female screw structure, and when the rotary motor 25a is rotated, the guide shaft 25b to which the driving force is transmitted is rotated and the base portion 25c is guided accordingly It slides along the axis 25b. The first drive unit 25 moves the feed element 24 in the first region (feed region) R1, and the two guide shafts 25b are arranged to cover the first region R1.

  The position detection unit 26 is a detection unit which is disposed in a second area (position detection area) R2 separated from the first area R1 and detects the position (presence) of the power receiving element 31. The detection method is not particularly limited, and for example, detection is performed based on the shift of the resonance frequency. Specifically, in the case where the position detection unit 26 includes a plurality of position detection coils, if the power receiving element 31 exists at the position corresponding to the position detection coil, the resonance frequency etc. changes and the voltage is applied to the position detection coil The waveforms of the voltage and the current change. And the position of the call | power receiving element 31 can be pinpointed by detecting the said change. The position detection unit 26 supplies the acquired position information of the power receiving element 31 to the control unit 22.

  In addition, as another detection method, a plurality of matrix coils are provided, a method of detecting a coupling state of the matrix coils and the power receiving element 31 (conductor) to detect a position, a plurality of photoelectric elements, and There is a method of detecting that the device 3 has covered a specific photoelectric element to detect the position of the power receiving element.

  The second drive unit 27 supplies the electric power supplied from the power supply unit 21 to the rotary motor 27a based on a command from the control unit 22 and the rotary motor 27a provided in the vicinity of the inner side surface of the housing 2a. A second drive circuit (not shown) for rotating the first gear 27b attached to the rotary motor 27a and positions rotated 120 degrees and 240 degrees with respect to the first gear 27b about the central axis 2c And a second gear 27c and a third gear 27d disposed at the Each gear 27b to 27d is fitted with a gear 210 provided on the periphery of the back surface of the feed surface 2b, and when the rotary motor 27a rotates, the driving force is transmitted to the feed surface 2b via the gear 27b and the gear 210. Thus, the feeding surface 2b rotates about the central axis 2c.

  The power receiving device 3 includes a power receiving element 31, a rectifying unit 32, a power supply unit 33, a control unit 34, and a rechargeable battery 35. The power receiving element 31 receives the power transmitted from the power feeding element 24 as described above. The AC power received by the power receiving element 31 is supplied to the rectifying unit 32. The rectifying unit 32 is configured of, for example, a diode, a capacitor, and the like, and converts alternating current power supplied from the power receiving element 31 into direct current power.

  The power converted into direct current by the rectifying unit 32 is supplied to the power supply unit 33. The control unit 34 is a control unit that controls the entire power receiving device 3 and controls conversion of alternating current power received by the power receiving element 31 into direct current power by the rectifying unit 32 and storage of the rechargeable battery 35 by the power supply unit 33.

  Hereinafter, the process which the control part 22 of the non-contact electric power feeding apparatus 2 performs is demonstrated with reference to FIG. FIG. 5 is a flowchart showing the flow of processing executed by the control unit 22 of the non-contact power feeding device 2 of the present embodiment. In step S01, the control unit 22 determines whether a feed start instruction has been issued. The feed start instruction is issued by, for example, pressing the feed start button of the non-contact power feed device 2 by the user, but the invention is not limited thereto. For example, as long as power is supplied from the power supply unit 21 If there is any), it may be determined that the feed start time has been made. If the feed start instruction has been issued (Y in step S01), the process proceeds to step S02. If the feed start instruction is not issued (N in step S01), the process returns to step S01.

  In step S02, the control unit 22 determines whether or not the power receiving element 31 is present on the second region R2. Whether or not the power receiving element 31 is present on the second region R2 is determined based on the position information of the power receiving element 31 detected by the position detection unit 26. If the power receiving element 31 exists on the second region R2 (Y in step S02), the process proceeds to step S03, and if the power receiving element 31 does not exist on the second region R2 (N in step S02) Go to S04. In addition, when the power receiving element 31 exists on the second region R2 at the time of the first determination in step S02, when the user places the power receiving device 3 on the power feeding surface 2b, position detection is performed with the power feeding surface 2b interposed therebetween. The case is that the unit 26 and the power receiving element 31 are facing each other.

  In step S03, the control unit 22 controls the second drive unit 27 based on the correction information of the first region R1 and the second region R2 to rotate the power feeding surface 2b, and the power receiving element 31 is Move onto the area R1 of In the present embodiment, the second region R2 is a position rotated clockwise by 90 degrees with respect to the first region R1 about the central axis 2c. Therefore, information for controlling the second drive unit 27 so that the feeding surface 2b is rotated 90 degrees counterclockwise is included as correction information to correct the positional deviation. The feed surface 2b is rotated 90 degrees counterclockwise, and the feed element 24 and the power receiving element 32 moving in the first region R1 can be opposed to each other across the feed surface 2b.

  In step S04, the control unit 22 controls the second drive unit 27 to rotate the feeding surface 2b by a predetermined angle (for example, 5 degrees clockwise). As long as the power receiving element 31 is not detected by the position detection unit 26 (N in step S02), the power receiving element 31 is moved onto the second region R2 by repeating step S04 and gradually rotating the power feeding surface 2b.

  In step S05, the control unit 22 controls the first drive unit 25 based on the position information of the power receiving element 31 to move the power feeding element 32 in the radial direction to align the power feeding element 24 and the power receiving element 32 (power feeding element 24) and the power receiving element 32 are aligned so as to face each other across the feeding surface 2b. The position information of the power receiving element 31 includes, for example, the presence of the power receiving element 31 at a point separated by a predetermined distance in the radial direction from the central axis 2 c. A correction value for aligning the two is calculated based on the position information. Then, the first drive unit 25 is controlled based on the calculated correction value.

  After the alignment between the power feeding element 24 and the power receiving element 32 is completed in step S05, the control unit 22 controls the power feeding element drive circuit 33 in step S06 to start the power feeding process. In step S07, control unit 22 determines whether or not the power feeding process is completed. If the power feeding process is completed (Y in step S07), the power feeding process is terminated, and if the power feeding process is not completed (step S07) N) Continue the power supply process. For example, when the user presses the power supply stop button of the non-contact power feeding device 2 or the charging of the power receiving device 3 is completed (the remaining battery capacity of the rechargeable battery 35 is 100%), the power feeding process is ended. judge.

  According to the present embodiment, since the position detection unit that detects the position of the power receiving element is provided, alignment between the power feeding element and the power receiving element is possible. In addition, the first area in which the feed element moves and the second area in which the position detection unit is disposed are separated from each other and do not overlap. Therefore, the position detection unit does not intervene between the feeding element and the feeding surface, and the distance between the feeding element and the receiving element on the feeding surface is short, and the feeding efficiency is not reduced. Moreover, the increase in the thickness of the housing of the non-contact power feeding device can be suppressed.

  In addition, since the moving direction (radial direction) of the feeding element by the first driving unit and the moving direction (circumferential direction) of the feeding surface by the second driving unit are different, using both driving units makes it possible to Alignment with the feed element can be performed reliably.

Second Embodiment
In the first embodiment, the feeding surface 2b is rotated by the second drive unit 27. However, the feeding surface 2b may not be rotated. In the present embodiment, the second driving unit 27 is a position detection unit 26. And the feed element 24 is integrally rotated. FIG. 6 is a transparent plan view showing an example of the non-contact power feeding system of the present embodiment. FIG. 7 is a cross-sectional view taken along the line 200-200 in FIG.

  In the present embodiment, the feeding surface 2b is non-rotatably fixed to the housing 2a (the feeding surface 2b may be integrally formed with the housing 2a), and the inside of the housing 2a is A circular rotary table 2d rotatably supported relative to the housing 2a about the central axis 2c is provided.

  Each part which comprises the non-contact electric power supply 2 is provided on the rotation stand 2d, and when the rotation stand 2d rotates, it integrally rotates in connection with it.

  The second drive unit 27 of the present embodiment is for rotating the rotating table 2 d, and supplies the electric power supplied from the rotation motor 27 a and the power supply unit 21 to the rotation motor 27 a based on a command from the control unit 22. A second drive circuit (not shown) for rotating the rotation motor 27a, a first gear 27b attached to the rotation motor 27a, and 120 degrees and 240 degrees rotation with respect to the first gear 27b about the central axis 2c. The second gear 27c and the third gear 27d are disposed at the second position. The rotary motor 27a to which the first gear 27b is attached, the second gear 27c, and the third gear 27d are all provided at the peripheral portion of the rotary table 2d, and the gears 27b to 27d are provided on the inner side surface of the housing 2a. By fitting with the provided gear 210, the turntable 2d is supported by the housing 2a.

  When the rotary motor 27a rotates, its driving force is transmitted to the rotary table 2d via the gear 27b and the gear 210, and the rotary table 2d rotates about the central axis 2c.

  Hereinafter, the process which the control part 22 of the non-contact electric power feeding apparatus 2 performs is demonstrated with reference to FIG. FIG. 8 is a flowchart showing the flow of processing performed by the control unit 22 of the non-contact power feeding device 2 of the present embodiment. Steps S11 to S12 and S15 to S17 in FIG. 8 are the same as steps S01 to S02 and S05 to S07 in FIG. 5, respectively.

  When the power receiving element 31 exists on the second area R2 (Y in step S12), the control unit 22 performs the second process based on the correction information of the first area R1 and the second area R2 in step S13. The drive unit 27 is controlled to rotate the turntable 2 d to move the first region R <b> 1 below the power receiving element 31. In the present embodiment, the second region R2 is a position rotated clockwise by 90 degrees with respect to the first region R1 about the central axis 2c. Therefore, information for controlling the second drive unit 27 so that the turntable 2d is rotated 90 degrees clockwise is included as correction information to correct the positional deviation. By rotating the rotation table 2d clockwise by 90 degrees, the power feeding element 24 and the power receiving element 32 moving in the first region R1 can be opposed with the feeding surface 2b interposed therebetween.

  If the power receiving element 31 does not exist on the second region R2 (N in step S12), the control unit 22 controls the second drive unit 27 in step S14 to make the rotary base 2d a predetermined angle (for example, clockwise). 5) rotate. As long as the power receiving element 31 is not detected by the position detection unit 26 (N in step S12), the second area R2 is moved below the power receiving element 31 by repeating step S14 and rotating the rotary table 2d gradually.

  According to the present embodiment, since the position detection unit that detects the position of the power receiving element is provided, alignment between the power feeding element and the power receiving element is possible. In addition, the first area in which the feed element moves and the second area in which the position detection unit is disposed are separated from each other and do not overlap. Therefore, the position detection unit does not intervene between the feeding element and the feeding surface, and the distance between the feeding element and the receiving element on the feeding surface is short, and the feeding efficiency is not reduced. Moreover, the increase in the thickness of the housing of the non-contact power feeding device can be suppressed.

  In addition, since the moving direction (radial direction) of the feeding element by the first drive unit is different from the moving direction (circumferential direction) of the position detection unit by the second driving unit and the feeding element, use both driving units. Thus, alignment between the power receiving element and the power feeding element can be reliably performed.

  In addition, since the power feeding surface does not rotate, the power receiving device does not move for alignment between the power feeding element and the power receiving element, and charges and uses the power receiving device at a desired position on the power feeding surface for the user. be able to. In addition, since all movement for alignment of the power feeding element and the power receiving element is performed inside the housing, the outer surface of the housing contacts the installation environment (wall, furniture, etc.) Alignment is not inhibited.

Third Embodiment
In the first embodiment and the second embodiment, the feeding surface 2b or the rotating table 2d is rotated by the second drive unit 27. However, the present invention is not limited to this and may move linearly. Good. FIG. 9 is a perspective view showing an example of the non-contact power feeding system of the present embodiment. FIG. 10 is a transparent plan view showing an example of the non-contact power feeding system of the present embodiment. 11 is a cross-sectional view taken along the line 300-300 in FIG.

  The non-contact power feeding system 1 of the present embodiment includes a non-contact power feeding device 2 and a power receiving device 3. The non-contact power feeding device 2 is provided with a housing 2 a internally provided with various configurations for feeding power to the power receiving element 31 of the power receiving device 3, and power feeding disposed above the housing 2 a and the power receiving device 3 is mounted. And a face 2b. The housing 2a and the feeding surface 2b are rectangular in plan view. The feeding surface 2b is immovably fixed to the housing 2a (the feeding surface 2b may be integrally formed with the housing 2a). A protrusion P is provided at the right end of the feeding surface 2 b, and the power receiving device 3 is not placed on the protrusion P. This is because a feed element 24 described below below the protrusion P can not move.

  The first drive unit 25 supplies the electric power supplied from the rotation motor 25 a and the power supply unit 21 to the rotation motor 25 a based on the command from the control unit 22 to rotate the rotation motor 25 a (not shown). 2), two guide shafts 25b extending in parallel to the short side direction (X direction in the figure) of the non-contact power feeding device 2 with a predetermined interval, and the guide shafts 25b on the two guide shafts 25b. And a base portion 25c slidably disposed in the axial direction of the above and supporting the feeding element 24. The rotary motor 25a applies a driving force to one of the guide shafts 25b. The guide shaft 25b and the base portion 25c are fitted by a male screw female screw structure, and when the rotary motor 25a is rotated, the guide shaft 25b to which the driving force is transmitted is rotated and the base portion 25c is guided accordingly It slides along the axis 25b. The first drive unit 25 moves the feed element 24 in the first region (feed region) R1, and the two guide shafts 25b are arranged to cover the first region R1.

  The position detection unit 26 is mounted on a base portion 27 c described later so as to be disposed in a second area (position detection area) R 2 separated from the first area R 1, and detects the position (presence) of the power receiving element 31 Detection means. The position detection unit 26 is arranged to extend in the lateral direction of the non-contact power feeding device 2.

  The second drive unit 27 supplies the electric power supplied from the power supply unit 21 to the rotary motor 27a based on a command from the control unit 22 and the rotary motor 27a provided in the vicinity of the inner side surface of the housing 2a. Drive circuit (not shown) for rotating the two guide shafts 27b extending in parallel with the longitudinal direction (Y direction in the figure) of the non-contact power feeding device 2 with a predetermined interval, and two And a base portion 27c disposed slidably on the guide shaft 27b in the axial direction of the guide shaft 27b and supporting the first drive portion 25 and the position detection portion 26. The rotary motor 27a applies a driving force to one of the guide shafts 27b. The guide shaft 27b and the base portion 27c are fitted by a male screw female screw structure, and when the rotary motor 27a is rotated, the guide shaft 27b to which the driving force is transmitted is rotated, and the base portion 27c is guided accordingly It slides along the axis 27b. The second drive unit 27 moves the first drive unit 25 and the position detection unit 26 along the feeding surface 2b, and the two guide shafts 27b are arranged to cover substantially the entire feeding surface 2b. Be done.

  Hereinafter, the process which the control part 22 of the non-contact electric power feeding apparatus 2 performs is demonstrated with reference to FIG. FIG. 12 is a flowchart showing the flow of processing performed by the control unit 22 of the non-contact power feeding device 2 of the present embodiment. Steps S21 to S22 and S26 to S27 in FIG. 12 are the same as steps S01 to S02 and S06 to S07 in FIG. 5, respectively.

  When the power receiving element 31 exists on the second region R2 (Y in step S22), the control unit 22 performs the second process based on the correction information of the first region R1 and the second region R2 in step S23. The control unit 27 controls the drive unit 27 to move the base unit 27 c in the longitudinal direction (Y direction in the drawing) of the non-contact power feeding device 2. In the present embodiment, the second region R2 is a position separated from the first region R1 by a predetermined distance XS in the longitudinal right direction of the non-contact power feeding device 2. Therefore, information for controlling the second drive unit 27 so that the base unit 27c is moved in the longitudinal right direction by a predetermined distance XS is included as correction information to correct the positional deviation. By moving the base portion 27c in the longitudinal direction to the right by the predetermined distance XS, the power feeding element 24 and the power receiving element 32 moving in the first region R1 can be opposed to each other across the feeding surface 2b.

  If the power receiving element 31 does not exist on the second region R2 (N in step S22), the control unit 22 controls the second driving unit 27 in step S24 to control the base unit 27c by a predetermined distance (for example, 5 mm) Move in the longitudinal direction. For example, if the initial position of the base portion 27c is the left end portion of the guide shaft 27b, it is moved by a predetermined distance in the longitudinal right direction. As long as the power detection element 31 is not detected by the position detection unit 26 (N in step S22), the second region R2 is moved below the power reception element 31 by repeating step S24 and gradually moving the base portion 27c in the longitudinal direction. .

  In step S25, the control unit 22 controls the first drive unit 25 based on the position information of the power receiving element 31 to move the power feeding element 32 in the short direction (X direction in the figure) of the non-contact power feeding device 2. Then, alignment of the feeding element 24 and the receiving element 32 (positioning in which the feeding element 24 and the receiving element 32 face each other across the feeding surface 2 b) is performed. The position information of the power receiving element 31 includes, for example, the fact that the power receiving element 31 exists at a predetermined distance away from the upper end of the second region R2 downward, and the control unit 22 determines the current position information of the power feeding element 24. A correction value for aligning the two is calculated based on the position information of the power receiving element 31 and the position information of the power receiving element 31. Then, the first drive unit 25 is controlled based on the calculated correction value.

  In this embodiment, the moving direction (X direction) of the feeding element 24 by the first drive unit 25 and the moving direction (Y direction) of the feeding element 24 and the position detection unit 26 by the second drive unit 27 are orthogonal to each other. The feed element 24 can be moved to any position below the feed surface 2b.

According to the present embodiment, since the position detection unit that detects the position of the power receiving element is provided, alignment between the power feeding element and the power receiving element is possible. In addition, the first area in which the feed element moves and the second area in which the position detection unit is disposed are separated from each other and do not overlap. Therefore, the position detection unit does not intervene between the feeding element and the feeding surface, and the distance between the feeding element and the receiving element on the feeding surface is short, and the feeding efficiency is not reduced. Moreover, the increase in the thickness of the housing of the non-contact power feeding device can be suppressed.

  Further, since the moving direction of the feed element by the first drive unit and the moving direction of the position detection unit and the feed element by the second drive unit are orthogonal to each other, using both of the drive units Alignment can be performed reliably.

  Further, since the power feeding surface does not move, the power receiving device does not move for alignment between the power feeding element and the power receiving element, and the user charges and uses the power receiving device at a desired position on the power feeding surface for the user. be able to. In addition, since all movement for alignment of the power feeding element and the power receiving element is performed inside the housing, the outer surface of the housing contacts the installation environment (wall, furniture, etc.) Alignment is not inhibited.

Fourth Embodiment
In the third embodiment, the feeding surface 2b is not moved, but the position detection unit 26 is moved. However, as in the first embodiment, the feeding position 2b is moved without moving the position detection unit 26. It is also good. FIG. 13 is a transparent plan view showing an example of the non-contact power feeding system of the present embodiment. FIG. 14 is a cross-sectional view taken along line 400-400 in FIG.

  The non-contact power feeding system 1 of the present embodiment includes a non-contact power feeding device 2 and a power receiving device 3. The non-contact power feeding device 2 is provided with a housing 2 a internally provided with various configurations for feeding power to the power receiving element 31 of the power receiving device 3, and power feeding disposed above the housing 2 a and the power receiving device 3 is mounted. And a face 2b. The housing 2a and the feeding surface 2b are rectangular in plan view. The feeding surface 2 b is provided movably with respect to the housing 2 a (details will be described later).

  The first drive unit 25 supplies the electric power supplied from the rotation motor 25 a and the power supply unit 21 to the rotation motor 25 a based on the command from the control unit 22 to rotate the rotation motor 25 a (not shown). 2), two guide shafts 25b extending in parallel to the short side direction (X direction in the figure) of the non-contact power feeding device 2 with a predetermined interval, and the guide shafts 25b on the two guide shafts 25b. And a base portion 25c slidably disposed in the axial direction of the above and supporting the feeding element 24. The rotary motor 25a applies a driving force to one of the guide shafts 25b. The guide shaft 25b and the base portion 25c are fitted by a male screw female screw structure, and when the rotary motor 25a is rotated, the guide shaft 25b to which the driving force is transmitted is rotated and the base portion 25c is guided accordingly It slides along the axis 25b. The first drive unit 25 moves the feed element 24 in the first region (feed region) R1, and the two guide shafts 25b are arranged to cover the first region R1.

  The second drive unit 27 supplies the electric power supplied from the power supply unit 21 to the rotary motor 27a based on a command from the control unit 22 so that the rotary motor 27a is provided in the vicinity of one inner side of the housing 2a. A second drive circuit (not shown) for rotating 27a, and two rollers provided in the vicinity of one inner side surface of the housing 2a and extending in parallel to the short side direction (X direction in the figure) of the noncontact power feeding device 2. And 27b. The rotary motor 27a applies a driving force to one of the rollers.

  The feeding surface 2b has a sheet member (belt conveyor) whose both ends are wound around the both rollers 27b. Then, when the rotary motor 27a rotates, the roller 27b to which the driving force is transmitted rotates, and along with that, the feeding surface 2b moves in the longitudinal direction (Y direction in the figure) of the non-contact power feeding device 2.

  The housing 2a is provided with a stopper 211 at its upper end. The stopper 211 is substantially U-shaped in a side view and has a predetermined gap with respect to the feeding surface 2 b. The said space | interval is set to the gap | interval which the power receiving apparatus 3 can not pass through, and when the electric power feeding surface 2b moves, it prevents that the power receiving apparatus 3 drops | omits of the electric power feeding surface 2b.

  Hereinafter, the process which the control part 22 of the non-contact electric power feeding apparatus 2 performs is demonstrated with reference to FIG. FIG. 15 is a flowchart showing the flow of processing executed by the control unit 22 of the non-contact power feeding device 2 of the present embodiment. Steps S31 to S32 and S35 to S37 in FIG. 15 are the same as steps S21 to S22 and S25 to S27 in FIG. 12, respectively.

  When the power receiving element 31 exists on the second area R2 (Y in step S32), the control unit 22 causes the second process to be performed based on the correction information of the first area R1 and the second area R2 in step S33. The drive unit 27 is controlled to move the feeding surface 2 b in the longitudinal direction (Y direction in the drawing) of the non-contact power feeding device 2. In the present embodiment, the second region R2 is a position separated from the first region R1 by a predetermined distance XS in the longitudinal right direction of the non-contact power feeding device 2. Therefore, information for controlling the second drive unit 27 so that the feeding surface 2b is moved by the predetermined distance XS in the longitudinal left direction is included as correction information to correct the positional deviation. By moving the feed surface 2b to the left by a predetermined distance XS, the feed element 24 and the power receiving element 32 moving in the first region R1 can be opposed to each other across the feed surface 2b.

  If the power receiving element 31 does not exist on the second region R2 (N in step S32), the control unit 22 controls the second driving unit 27 in step S34 to control the power supply surface 2b by a predetermined distance (for example, 5 mm) Move in Y direction. As long as the power receiving element 31 is not detected by the position detection unit 26 (N in step S32), the second region R2 is moved below the power receiving element 31 by repeating step S34 and gradually moving the feeding surface 2b in the longitudinal direction. .

  The movement control method of the feed surface 2b will be described below. For example, in the case where the position detection unit 26 is disposed substantially at the center in the longitudinal direction of the non-contact power feeding device 2, the feeding surface 2 b is left in the longitudinal left direction of the non-contact power feeding device 2 until the position detection unit 26 detects the power receiving element 31. Move it. At that time, the maximum movement distance A of the feeding surface 2b in one direction is set, and in this example, it is set to half the length of the non-contact power feeding device 2 in the longitudinal direction. When position detection unit 26 does not detect power reception element 31 even if power supply surface 2b is moved by distance A in the longitudinal left direction, it is assumed that the position where power reception device 3 is mounted is on the left side of second region R2. It is conceivable that the power receiving device 3 is present at the position of the stopper 211 provided at the left end of the non-contact power feeding device 2. Therefore, after moving the feeding surface 2b by the distance A in the longitudinal left direction of the non-contact power feeding device 2, the power receiving element 31 is moved onto the second region R2 by moving the feeding surface 2b by the distance A in the longitudinal right direction. It can be moved.

  Also, for example, when the position detection unit 26 is disposed at the left end or the right end in the longitudinal direction of the non-contact power feeding device 2, the power feeding surface 2 b of the non-contact power feeding device 2 is detected until the position detection unit 26 detects the power receiving element 31. Move longitudinally leftward or rightward. Thus, the power receiving element 31 can be moved onto the second region R2.

  According to the present embodiment, since the position detection unit that detects the position of the power receiving element is provided, alignment between the power feeding element and the power receiving element is possible. In addition, the first area in which the feed element moves and the second area in which the position detection unit is disposed are separated from each other and do not overlap. Therefore, the position detection unit does not intervene between the feeding element and the feeding surface, and the distance between the feeding element and the receiving element on the feeding surface is short, and the feeding efficiency is not reduced. Moreover, the increase in the thickness of the housing of the non-contact power feeding device can be suppressed.

  In addition, since the moving direction of the feeding element by the first drive unit and the moving direction of the feeding surface by the second driving unit are orthogonal to each other, the use of both driving units ensures the alignment between the power receiving element and the feeding element. Can be done.

<Supplement>
Note that the embodiment disclosed this time is illustrative in all points and not restrictive. The scope of the present invention is indicated not by the description of the embodiments described above but by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

  For example, although the non-contact power feeding device 2 is configured to include the single position detection unit 26 in the first to fourth embodiments, even if the plurality of position detection units 26 are provided as illustrated in FIG. It is preferable (FIG. 16 is a modification of the first embodiment but is also applicable to the other embodiments). It is desirable that the distance between each position detection unit 26 is constant, and in particular, when the center axis 2c is disposed as shown in FIG. 16, the distance between each position detection unit 26 is 360 degrees / a position detection unit 26. It is desirable to arrange them at intervals (180 degrees in FIG. 16). According to the said structure, the power receiving element 31 is detected by one of the position detection parts 26 by rotating the position detection part 26 or the electric power feeding surface 2b at the maximum (360 degree / number of the position detection parts 26) degree.

  When each position detection unit 26 is driven individually or simultaneously, and any position detection unit 26 detects the position of the power receiving element 31, as described in each embodiment, the first region R1 and the second region R1 are used. The feed element 24 and the power receiving element 31 are aligned based on the correction information with the region R2 and the position information of the power receiving element 31, and the power feeding process is started.

1 Non-contact power feeding system 2 Non-contact power feeding device 3 Power receiving device (object to be fed)
Reference Signs List 21 power supply unit 22 control unit 23 feed element drive circuit 24 feed element 25 first drive unit 26 position detection unit 27 second drive unit

Claims (9)

A feeding surface on which the feeding object is placed;
A feed element for feeding power to the feed target;
A position detection unit that makes the distance from the feeding surface the same as the feeding element and detects the position of the feeding object on the feeding surface;
A first drive unit for moving the feed element;
A second drive unit for moving the feeding surface;
A contactless power supply device comprising:   2. The non-contact power feeding device according to claim 1, wherein the second driving unit rotates the feeding surface around a central axis orthogonal to the feeding surface.   2. The non-contact power feeding device according to claim 1, wherein the second drive moves the feeding surface linearly in a direction parallel to the feeding surface. The non-contact power feeding device according to claim 3, wherein the power feeding surface is configured by a sheet member. A feeding surface on which the feeding object is placed;
A feed element for feeding power to the feed target;
A position detection unit that makes the distance from the feeding surface the same as the feeding element and detects the position of the feeding object on the feeding surface;
A first drive unit for moving the feed element;
A second drive unit for moving the position detection unit;
Equipped with
The non-contact power feeding device, wherein the second drive portion rotates the position detection portion around a central axis orthogonal to the power feeding surface . A feeding surface on which the feeding object is placed;
A feed element for feeding power to the feed target;
A position detection unit that makes the distance from the feeding surface the same as the feeding element and detects the position of the feeding object on the feeding surface;
A first drive unit that moves only the feed element among the feed element and the position detection unit;
A second drive unit for moving the position detection unit;
A contactless power supply device comprising: The non-contact power feeding device according to claim 6 , wherein the second drive portion linearly moves the position detection portion in a direction parallel to the feeding surface.   The non-contact power feeding device according to any one of claims 5 to 7, wherein the second drive unit moves both the power feeding element and the position detection unit.   9. The non-contact power feeding device according to claim 8, wherein the second drive unit moves a base that supports the power feeding element and the position detection unit.

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