JP2010288430A - Charging cradle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging cradle capable of highly efficiently charging a plurality of devices each having a built-in battery even if the devices are put on anywhere on the upper surface of a case. <P>SOLUTION: The charging cradle includes: a plurality of power transmission coils 11 for inducing an electromotive force to a power reception coil 51; a case 20 having an upper surface plate 21 of an area capable of putting a plurality of devices 50 each having a built-in battery on the upper surface; a moving mechanism 13 for moving each of the transmission coils 11 along the inner surface of the upper surface plate 21; a position detection controller 14 for detecting the position of each of the devices 50 put on the upper surface plate 21 and controlling the moving mechanism 13 to make each of the power transmission coils 11 close to the power reception coil 51 of each of the devices 50. In the charging cradle, when the plurality of device 50 are put on the upper surface plate 21 of the case 20, the position detection controller 14 detects the position of each of the devices 50, and the moving mechanism 13 moves each of the power transmission coils 11 to allow them to be close to the power reception coils 51 of the device 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a charging stand for placing a battery built-in device such as a battery pack or a mobile phone on top and carrying power by electromagnetic induction to charge the built-in battery, and in particular, mounting a plurality of battery built-in devices on each built-in device. It is related with the charging stand which can charge a battery together.

  A charging stand has been developed that carries power from the power transmission coil to the power receiving coil by the action of electromagnetic induction and charges the built-in battery. (See Patent Documents 1 and 2)

  Patent Document 1 describes a structure in which a power transmission coil that is excited by an AC power source is built in a charging stand, and a power receiving coil that is electromagnetically coupled to the power transmission coil is built in a battery pack. Further, the battery pack includes a circuit that rectifies the alternating current induced in the power receiving coil and supplies the battery to the battery for charging. According to this structure, the battery pack can be charged in a non-contact state by placing the battery pack on the charging stand.

  Furthermore, Patent Document 2 has a structure in which a battery is built in the bottom of a battery built-in device, a secondary charging adapter is provided below the battery, and a receiving coil and a charging circuit are built in the secondary charging adapter. Describe. In addition, a structure in which a power transmission coil that is electromagnetically coupled to the power reception coil is provided on the charging stand is also described. A battery built-in device that couples the secondary charging adapter is placed on the charging stand, and power is transferred from the power transmission coil to the power receiving coil to charge the battery of the battery built-in device.

JP-A-9-63655 Utility model registration No. 3011829

  Patent Document 1 has a drawback that the battery pack cannot be charged if the position of the battery pack placed on the charging stand is shifted. This is because if the relative position between the portable electronic device and the charging stand is shifted, the power transmission coil and the power reception coil are not electromagnetically coupled, and AC power cannot be conveyed from the power transmission coil to the power reception coil. As described in Patent Document 2, this drawback can be eliminated by providing a positioning convex portion on the charging stand and providing a positioning concave portion into which the positioning convex portion is inserted in the portable electronic device. This structure can prevent the relative displacement between the portable electronic device and the charging stand by guiding the positioning protrusion to the positioning recess.

  However, since the structure shown in Patent Document 2 sets the battery built-in device on the charging stand so as to guide the positioning convex portion to the positioning concave portion, there is a drawback that it takes time to set the battery built-in device. In addition, this structure has a drawback that it is difficult for all users to always set the battery-equipped device on the charging stand in a normal state. Further, this structure has a drawback that the battery built-in device cannot be made thin because a positioning recess is provided on the bottom surface of the case and the power receiving coil is disposed on the positioning recess. Since a battery built-in device such as a mobile phone is required to be as thin as possible, there is a disadvantage that it becomes inconvenient to carry if it is thickened by the positioning recess.

  This adverse effect can be solved by generating a magnetic field that conveys power to the receiving coil over a wide area of the entire upper surface of the charging stand. However, according to this structure, since a magnetic field is generated even in a portion where the battery built-in device is not placed, there is a drawback that the power efficiency of carrying from the power transmission coil to the power reception coil is lowered. Moreover, when a metal such as iron is placed on the charging stand, there is a problem in that a current flows through the magnetic induction effect and heat is generated.

  Further, a charging stand that generates a magnetic field for carrying power over a large area of the entire upper surface of the charging stand can carry a plurality of battery built-in devices, carry power to a plurality of power receiving coils, and charge them together. However, in this charging base, it is necessary to enlarge the power transmission coil as the mounting surface of the charging base is increased so that a large number of battery built-in devices can be charged. A large power transmission coil charging base is always difficult to efficiently transfer power to the power reception coil of the battery built-in device. This is because, since a small power receiving coil is set on a large power transmitting coil, the power receiving coil is electromagnetically coupled only to a narrow region of the power transmitting coil when the number of battery built-in devices to be mounted is small. The state in which a large power transmission coil is electromagnetically coupled to a small power reception coil also has an adverse effect that an alternating magnetic field leaks from a region where the power transmission coil is not electromagnetically coupled to the power reception coil. Furthermore, this charging stand cannot control independently the electric power supplied to each battery built-in apparatus. For this reason, it is necessary to control the charging power of the internal battery on the battery internal device side. If the built-in battery is fully charged and the charging power is limited in a state where predetermined power is transmitted from the power transmission coil to the power receiving coil, there is a drawback that heat generation becomes large in the battery built-in device. This is because the difference between the power transmitted to the power receiving coil and the charging power of the built-in battery generates heat. The built-in battery device and the built-in battery have a difficult mechanism for dissipating heat, and the heat generation has a drawback of extremely adversely affecting the built-in battery and the battery built-in device itself.

The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to efficiently charge each built-in battery while controlling the built-in battery to preferable charging conditions wherever a plurality of built-in battery devices are placed on the upper surface of the case, and reduce the heat generation of the built-in battery device and the built-in battery. To provide a charging stand.
Another important object of the present invention is to provide a charging stand that can reduce the leakage of an AC magnetic field to the outside while having a structure in which a plurality of battery built-in devices can be mounted and charged together.
In addition, another important object of the present invention is to provide a charging stand that can improve safety by forming a structure that does not generate heat even when another metal is placed on the upper surface of the case together with the battery built-in device.

Means for Solving the Problems and Effects of the Invention

  The charging stand according to the present invention is a charging stand for a battery built-in device 50 that includes a power receiving coil 51 that is electromagnetically coupled and a battery 52 that is charged by power induced in the power receiving coil 51. The charging stand includes a plurality of power transmission coils 11 that are connected to the AC power source 12 and induce an electromotive force in the power receiving coil 51, and a plurality of power transmission coils 11, and a plurality of battery built-in devices 50 are mounted on the upper surface. A case 20 having an upper surface plate 21 having a possible area, a moving mechanism 13 that is housed in the case 20 and moves the power transmission coils 11 independently along the inner surface of the upper surface plate 21, and the upper surface plate 21. Position detection controllers 14 and 84 for detecting the position of each battery built-in device 50 and controlling the moving mechanism 13 to bring each power transmission coil 11 closer to the power receiving coil 51 of each battery built-in device 50 are provided. . When a plurality of battery built-in devices 50 are placed on the upper plate 21 of the case 20, the charging stand detects the position of each battery built-in device 50 by the position detection controllers 14 and 84, and the position detection controllers 14 and 84 The moving mechanism 13 is controlled to move each power transmission coil 11 along the top plate 21 with the moving mechanism 13 so as to approach the power receiving coil 51 of each battery built-in device 50.

  The above charging stand can efficiently charge each built-in battery while controlling the built-in battery to the preferred charging conditions, regardless of where the multiple battery built-in devices are placed on the top of the case, and can reduce the heat generated by the built-in battery and built-in battery There is. The charging base described above includes a plurality of power transmission coils that can be electrically coupled to each power receiving coil to carry power, and a moving mechanism that brings each power transmission coil closer to the power receiving coil of each battery built-in device. Because. The charging stand separately charges the power transmission coil to the power reception coil of each battery built-in device mounted on the case. For this reason, each battery built-in apparatus can carry electric power from a separate power transmission coil to each power reception coil. Therefore, the electric power carried from each power transmission coil to the power reception coil can be controlled, and each built-in battery can be fully charged in a preferable charged state. Moreover, the electric power transmitted to each receiving coil from a separate power transmission coil can be controlled. Therefore, since the electric power transmitted from the power transmission coil can be reduced or stopped in a battery built-in device with a built-in battery whose charging power is limited or charging is stopped, heat generation of the battery built-in device or the built-in battery can be reduced. Furthermore, since separate power transmission coils are electromagnetically coupled to the respective power receiving coils to carry power, it is possible to efficiently carry power to each battery built-in device and charge the built-in battery with high efficiency.

  Further, the charging stand of the present invention increases the area of the upper surface of the case, sets a plurality of battery built-in devices, and realizes a structure in which the built-in batteries of each battery built-in device can be charged together. The feature that can reduce the leakage to the outside is also realized. This is because each power transmission coil can be electromagnetically coupled to the power reception coil to carry power.

  Furthermore, since the charging stand of the present invention detects the position of the battery built-in device and brings the power transmission coil close to the power receiving coil of the battery built-in device, even if another metal is placed on the upper surface of the case together with the battery built-in device. A structure that does not generate heat can be obtained, and safety can be improved.

  Furthermore, the above charging stand is extremely simple without setting the battery built-in device at a predetermined position of the charging stand, for example, while guiding the positioning convex portion to the positioning concave portion, that is, without positioning, as in the past. The battery built-in device can be placed on the charging stand to efficiently charge the built-in battery. As described above, the charging stand that does not require the positioning convex portion and the positioning concave portion has a feature that the battery built-in device can be designed thinly and can be conveniently carried.

  The charging stand according to the present invention includes a plurality of sets of drive mechanisms 40 in which the moving mechanism 13 can independently move the power transmission coils 11 along the inner surface of the upper surface plate 21. Y-axis drive mechanism 40B and X-axis drive mechanism 40A that move 11 in directions crossing each other can be provided. The Y-axis drive mechanism 40B includes a leaf spring 41 formed by connecting the power transmission coil 11 to the tip, a winding shaft 42 that winds up the leaf spring 41, and a forward rotation of the winding shaft 42 to rotate the leaf spring 41. A Y-axis actuator 43 that winds around the take-up shaft 42 and reversely feeds the leaf spring 41 from the take-up shaft 42 to move the power transmission coil 11 in the Y-axis direction that is the longitudinal direction of the leaf spring 41. it can. The X-axis drive mechanism 40 </ b> A can include an X-axis guide 44 that moves the winding shaft 42 in the X-axis direction and an X-axis actuator 45 that moves the winding shaft 42 along the X-axis guide 44. In the charging stand, the position detection controllers 14 and 84 detect the position of each of the battery built-in devices 50, and control the Y-axis actuator 43 and the X-axis actuator 45 provided in each drive mechanism 40, respectively. The power transmission coil 11 can be brought close to the power reception coil 51 of each battery built-in device 50.

  The above charging stand is provided with a plurality of sets of drive mechanisms for independently moving the plurality of power transmission coils separately in the movement mechanism, while enlarging the movement region of each power transmission coil so that each power transmission coil is positioned at an optimum position. There is a feature that it is possible to charge the built-in battery of a plurality of battery built-in devices while moving to. A charging stand that mounts a plurality of battery built-in devices on a case and charges each built-in battery together needs to bring a power transmission coil close to a power receiving coil of each battery built-in device. Moreover, this charging stand can be conveniently used as a structure that does not limit the area where the user sets the battery built-in device. However, in the charging stand including a plurality of sets of drive mechanisms that move a plurality of power transmission coils in the X-axis direction and the Y-axis direction, each drive mechanism that moves the power transmission coils in the X-axis direction and the Y-axis direction has other driving mechanisms. It is difficult to move the power transmission coil to a free position by limiting the movement of the mechanism. This is because the X-axis guide and the Y-axis guide are provided so as to intersect each other in order to move the power transmission coil in the X-axis direction and the Y-axis direction. In particular, since the charging stand moves the power transmission coil in the same horizontal plane so as to approach the power reception coil of the battery built-in device set on the case, a plurality of sets of drive mechanisms interfere with each other to move the power transmission coil. Limit the area. However, each of the drive mechanisms provided in the above charging base rotates the winding shaft in the normal direction or reverse direction, winds up or pulls out the leaf spring provided with the power transmission coil at the tip, and reciprocates in the longitudinal direction. The power transmission coil is moved in the Y-axis direction. For this reason, the area | region which can move each power transmission coil can be enlarged, without requiring the Y-axis guide which guides a power transmission coil to a Y-axis direction. Therefore, the above charging stand allows a user to freely place a battery built-in device on the case, and allows a plurality of power transmission coils to approach the power receiving coil of each battery built-in device to efficiently charge the built-in battery. Realize superior features.

In the charging stand of the present invention, the case 20 can be provided with a horizontal guide 22 that moves in the horizontal direction while restricting the vertical movement of the power transmission coil 11.
The charging stand can move horizontally along the top plate while preventing vertical displacement of the power transmission coil, and can efficiently charge the built-in battery by bringing the plurality of power transmission coils close to each power reception coil.

In the charging stand of the present invention, the case 20 is provided with a guide plate 23 at a position facing the upper surface plate 21, and the vertical movement of the power transmission coil 11 is restricted between the guide plate 23 and the upper surface plate 21. The horizontal guide 22 can move the power transmission coil 11 in the horizontal direction as the horizontal guide 22 by providing the movement space 24 to be moved in the horizontal direction.
This charging stand has a simple structure and can stably move the power transmission coil in the horizontal direction along the top plate.

In the charging stand of the present invention, the leaf spring 41 can be a ribbon-like thin plate that is curved in an arch shape in a cross-sectional shape that intersects in the longitudinal direction in an extruded state that is fed from the winding shaft 42.
The charging stand can stably hold the fed leaf spring in a straight line. For this reason, the power transmission coil can be stably moved in the Y-axis direction while using a thin leaf spring. Since the leaf spring can be made thin, it is possible to realize a feature that the winding coil can be smoothly rotated with a light torque and the power transmission coil can be moved in the Y-axis direction.

In the charging stand of the present invention, the Y-axis actuator 43 and the X-axis actuator 45 can be stepping motors.
This charging stand has a feature that the power transmission coil can be moved to an accurate position by a simple mechanism and can be close to the power reception coil. This is because the stepping motor can accurately control the rotational position.

The charging stand of the present invention includes a rack 46 in which an X-axis drive mechanism 40A is fixed to a take-up shaft 42, and a pinion 47 that meshes with the rack 46 and moves the rack 46 along the X-axis guide 44. Thus, the X-axis actuator 45 can rotate the pinion 47 to move the winding shaft 42 in the X-axis direction.
The above charging stand has a feature that the winding shaft can be stably moved in the X-axis direction with a simple mechanism.

The charging stand of the present invention includes a carriage 26 connected to the X-axis guide 44 so as to move along the X-axis guide 44, and a rack 46 is connected to the carriage 26 and the take-up shaft 42 is connected. The carriage 26 that connects the take-up shaft 42 via the rack 46 can be moved along the X-axis guide 44.
The above charging stand has a feature that the winding shaft can be stably moved in the X-axis direction with a simple mechanism.

In the charging stand of the present invention, the X-axis guide 44 is rotatably connected to the case 20, and the winding shaft 42 is connected to the X-axis guide 44 so that the X-axis guide 44 can move in the axial direction without rotating. The shaft actuator 43 is connected to the X-axis guide 44, and the X-axis guide 44 is rotated by the Y-axis actuator 43 to rotate the winding shaft 42.
The charging stand described above can move the power transmission coil in the Y-axis direction by fixing the Y-axis actuator that rotates the winding shaft to the case. This is because the Y-axis actuator can rotate the X-axis guide and move the power transmission coil in the Y-axis direction. In other words, this charging stand does not require the Y-axis actuator to be fixed to the carriage, for example, and transmit power etc. via the flexible lead wire, and there is no failure caused by the flexible lead wire. Thus, the power transmission coil can be stably moved in the Y-axis direction over a long period of time.

In the charging stand according to the present invention, a plurality of pinions 47 are arranged at predetermined intervals in the movement direction of the rack 46, and each pinion 47 is rotated by the X-axis actuator 45 to move the rack 46 in the X-axis direction. Can do.
This charging stand is characterized by a large stroke that can reciprocate the winding shaft in the X-axis direction with a short rack.

In the charging stand of the present invention, the position detection controllers 14 and 84 can detect the position of the power receiving coil 51 of each of the battery built-in devices 50 to bring the power transmitting coil 11 closer to the power receiving coil 51.
This charging stand detects the position of the power receiving coil built in each battery built-in device by the position detection controller and brings the power transmitting coil close to the power receiving coil, so that the power transmitting coil can be brought close to the power receiving coil accurately and efficiently. Can be charged. In particular, this charging stand is not related to the structure or model of the battery built-in device, in other words, regardless of the position of the receiving coil built in the battery built-in device, various battery built-in devices are placed on the top plate of the charging stand. Thus, the position of the power receiving coil built in the battery built-in device can be detected by the position detection controller, and the built-in battery can be charged efficiently.

Further, in the charging stand of the present invention, the position detection controller 84 has a plurality of position detection coils 30 fixed to the upper surface plate 21, a pulse power supply 31 that supplies a pulse signal to the position detection coil 30, and the pulse A receiving circuit 32 that receives an echo signal that is excited by a pulse signal supplied from the power supply 31 to the position detection coil 30 and that is output from the power reception coil 51 to the position detection coil 30, and receives power from the echo signal that the reception circuit 32 receives. An identification circuit 93 for determining the position of the coil 51 can be provided. The position detection coil 30 can include a plurality of X-axis detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis detection coils 30B that detect a position in the Y-axis direction. In a state where the pulse power supply 31 supplies a pulse signal to any one of the position detection coils 30, the position detection controller 84 converts an echo signal that is excited by this pulse signal and output from the power receiving coil 51 into the X-axis detection coil 30A. And the Y-axis detection coil 30B can be received and the position of the power receiving coil 51 can be determined.
In the above charging stand, the position detection controller sends the pulse signal from the pulse power source to the position detection coil, and the echo signal output from the power receiving coil excited by this pulse signal is transmitted to the X axis detection coil and the Y axis. Since the position of the power receiving coil is determined by receiving both of the detection coils, the position of the power receiving coil can be accurately detected even in a state where a plurality of battery built-in devices are mounted on the top plate.

It is a schematic perspective view of the charging stand concerning one Example of this invention. It is a top view which shows the internal structure of the charging stand concerning one Example of this invention. It is the III-III sectional view taken on the line of the charging stand shown in FIG. It is the IV-IV sectional view taken on the line of the charging stand shown in FIG. It is a block diagram of the charging stand and battery built-in apparatus concerning one Example of this invention. It is a circuit diagram which shows the position detection controller of the charging stand concerning one Example of this invention. FIG. 3 is an enlarged end view showing a leaf spring cross-section, and is a view corresponding to the end surface of the charging stand shown in FIG. 2 taken along line VII-VII. It is a top view which shows the internal structure of the charging stand concerning the other Example of this invention. It is a top view which shows the internal structure of the charging stand concerning the other Example of this invention. It is a figure which shows an example of the echo signal output from the receiving coil excited with the pulse signal. It is a circuit diagram which shows another example in which a 1st position detection controller detects the position of a receiving coil. It is a principle figure showing an example in which the 1st position detection controller detects the position of a plurality of receiving coils. It is a figure which shows the change of the oscillation frequency with respect to the relative position shift of a power transmission coil and a receiving coil. It is a block diagram of the charging stand and battery built-in apparatus concerning the other Example of this invention. It is a figure which shows the change of the voltage of a power transmission coil with respect to the relative position shift of a power transmission coil and a receiving coil. It is a figure which shows the change of the power consumption of the alternating current power supply which supplies electric power to a power transmission coil with respect to the relative position shift of a power transmission coil and a receiving coil. It is a figure which shows the change of the electric current of a receiving coil with respect to the relative position shift of a power transmission coil and a receiving coil. It is a circuit diagram which shows another example of a position detection controller. FIG. 19 is a principle diagram showing an example in which the position detection controller shown in FIG. 18 detects the positions of a plurality of power receiving coils.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a charging stand for embodying the technical idea of the present invention, and the present invention does not specify the charging stand as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  1 to 6 show a schematic configuration diagram and a principle diagram of a charging stand. As shown in FIGS. 1 and 6, the charging stand 10 places a plurality of battery built-in devices 50 on the charging stand 10 and charges the built-in batteries 52 of the respective battery built-in devices 50 by magnetic induction. The battery built-in device 50 includes a power receiving coil 51 that is electromagnetically coupled to the power transmitting coil 11. A battery 52 that is charged with electric power induced in the power receiving coil 51 is incorporated. Here, the battery built-in device 50 may be a battery pack.

  FIG. 6 shows a circuit diagram of the battery built-in device 50. The battery built-in device 50 has a capacitor 53 connected in parallel with the power receiving coil 51. The capacitor 53 and the power receiving coil 51 constitute a parallel resonance circuit 54. The resonance frequency of the capacitor 53 and the power receiving coil 51 can be efficiently conveyed from the power transmitting coil 11 to the power receiving coil 51 as a frequency that approximates the frequency of power conveyed from the power transmitting coil 11. The battery built-in device 50 of FIG. 6 includes a rectifier circuit 57 including a diode 55 that rectifies an alternating current output from the power receiving coil 51, a smoothing capacitor 56 that smoothes the rectified pulsating current, and an output from the rectifier circuit 57. And a charge control circuit 58 that charges the battery 52 with a direct current. The charge control circuit 58 detects full charge of the battery 52 and stops charging.

  As shown in FIGS. 1 to 6, the charging stand 10 includes a plurality of power transmission coils 11 that are connected to an AC power source 12 and induce an electromotive force in the power reception coil 51, and each power transmission coil 11 is embedded in the upper surface. Is a case 20 having an upper surface plate 21 having an area on which a plurality of battery built-in devices 50 are placed, and a movement that is incorporated in the case 20 and moves the power transmission coils 11 independently along the inner surface of the upper surface plate 21. Position detection control for detecting the position of the mechanism 13 and each of the battery built-in devices 50 placed on the upper surface plate 21 and controlling the moving mechanism 13 to bring each power transmission coil 11 closer to the power receiving coil 51 of the battery built-in device 50. And a container 14. The charging stand 10 includes a plurality of power transmission coils 11, an AC power source 12 that supplies AC power to each power transmission coil 11, a moving mechanism 13, and a position detection controller 14 in a case 20.

The charging stand 10 charges the built-in batteries 52 of the plurality of battery built-in devices 50 by the following operation.
(1) When a plurality of battery built-in devices 50 are placed on the upper surface plate 21 of the case 20, the position detection controller 14 detects the position of each battery built-in device 50.
(2) The position detection controller 14 that has detected the position of each battery built-in device 50 controls the moving mechanism 13 to move each power transmission coil 11 along the top plate 21 with the moving mechanism 13. The power receiving coil 51 of the battery built-in device 50 is made to approach.
(3) The plurality of power transmission coils 11 that separately approach each power reception coil 51 are electromagnetically coupled to each power reception coil 51 and carry AC power to the power reception coil 51.
(4) Each battery built-in device 50 rectifies the AC power of the power receiving coil 51 and converts it into DC, and charges the built-in battery 52 with this DC.

  As shown in FIGS. 2 and 5, the charging stand 10 that charges the batteries 52 of the plurality of battery built-in devices 50 by the above operation incorporates a plurality of power transmission coils 11 connected to the AC power supply 12 in the case 20. ing. Each power transmission coil 11 is disposed below the upper surface plate 21 of the case 20 and is disposed so as to move in the horizontal direction along the upper surface plate 21. The efficiency of power transfer from the power transmission coil 11 to the power reception coil 51 can be improved by narrowing the interval between the power transmission coil 11 and the power reception coil 51. Preferably, the distance between the power transmission coil 11 and the power reception coil 51 is set to 7 mm or less while the power transmission coil 11 is approaching the power reception coil 51. Therefore, the power transmission coil 11 is disposed below the top plate 21 and as close to the top plate 21 as possible. Since the power transmission coil 11 moves so as to approach the power reception coil 51 of the battery built-in device 50 placed on the upper surface plate 21, the power transmission coil 11 is disposed so as to be movable along the lower surface of the upper surface plate 21.

  The case 20 containing the power transmission coil 11 is provided with a flat upper surface plate 21 on which the battery built-in device 50 is placed on the upper surface. The charging stand 10 shown in FIGS. 1 to 4 is disposed horizontally with the entire top plate 21 as a flat surface. The upper surface plate 21 has such a size that a plurality of various battery built-in devices 50 having different sizes and outer shapes can be placed, for example, a quadrangle having a side of 10 cm to 50 cm, or a circle having a diameter of 10 cm to 50 cm. The charging stand of the present invention has a size that allows a larger number of battery built-in devices to be loaded simultaneously by charging the built-in battery at the same time by increasing the size of the top plate. The top plate can also be provided with a peripheral wall around it, and a battery built-in device can be set inside the peripheral wall to charge the built-in battery.

  Each power transmission coil 11 is spirally wound on a surface parallel to the upper surface plate 21 and radiates an alternating magnetic flux above the upper surface plate 21. The power transmission coil 11 radiates an alternating magnetic flux orthogonal to the upper surface plate 21 above the upper surface plate 21. The power transmission coil 11 is supplied with AC power from the AC power source 12 and radiates AC magnetic flux above the upper surface plate 21. The power transmission coil 11 can increase the inductance by winding a wire around a core 15 made of a magnetic material. The core 15 is made of a magnetic material such as ferrite having a high magnetic permeability, and has a bowl shape that opens upward. The bowl-shaped core 15 has a shape in which a columnar portion 15A disposed at the center of a power transmission coil 11 wound in a spiral shape and a cylindrical portion 15B disposed on the outside are connected at the bottom. The power transmission coil 11 having the core 15 can concentrate the magnetic flux to a specific portion and efficiently transmit power to the power reception coil 51. However, the power transmission coil does not necessarily need to be provided with a core, and may be an air-core coil. Since the air-core coil is light, a moving mechanism for moving it on the inner surface of the upper plate can be simplified. The power transmission coil 11 is substantially equal to the outer diameter of the power reception coil 51 and efficiently conveys power to the power reception coil 51.

  The charging stand 10 of FIGS. 2 and 5 is provided with two sets of power transmission coils 11 so that the built-in batteries 52 of the two battery built-in devices 50 can be charged simultaneously. The charging stand can be provided with three or more power transmission coils, and each power transmission coil can be independently moved to charge the internal batteries of the three or more battery built-in devices at the same time.

  In order to move the power transmission coil 11 in the horizontal plane along the upper surface plate 21, the case 20 is provided with a horizontal guide 22 that moves in the horizontal direction while restricting the movement of the power transmission coil 11 in the vertical direction. The case 20 in FIGS. 3 and 4 is provided with a guide plate 23 at a position facing the upper surface plate 21, while restricting the vertical movement of the power transmission coil 11 between the guide plate 23 and the upper surface plate 21. A moving space 24 for moving in the horizontal direction is provided as the horizontal guide 22. The horizontal guide 22 of the case 20 arranges the power transmission coil 11 in the moving space 24 so that the power transmission coil 11 is moved in a horizontal plane. The guide plate 23 can be a bottom plate of the case 20. The power transmission coil 11 shown in FIGS. 3 and 4 is provided with slide convex portions 25 having low frictional resistance on the upper surface and the lower surface. The power transmission coil 11 can move smoothly with a small frictional resistance while the slide convex portion 25 is in contact with the upper surface plate 21 and the guide plate 23.

  The AC power supply 12 supplies, for example, high-frequency power of 20 kHz to 1 MHz to each power transmission coil 11 separately while controlling supply power. The AC power supply 12 is connected to the power transmission coil 11 via a flexible lead wire 16. This is because the power transmission coil 11 is moved so as to approach the power reception coil 51 of the battery built-in device 50 placed on the upper surface plate 21. Although not shown, the AC power source 12 includes a self-excited oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit. The self-excited oscillation circuit uses the power transmission coil 11 in combination with the oscillation coil. Therefore, the oscillation frequency of this oscillation circuit changes due to the inductance of the power transmission coil 11. The inductance of the power transmission coil 11 changes at the relative position between the power transmission coil 11 and the power reception coil 51. This is because the mutual inductance between the power transmission coil 11 and the power reception coil 51 changes at the relative position between the power transmission coil 11 and the power reception coil 51. Therefore, the self-excited oscillation circuit that uses the power transmission coil 11 as the oscillation coil changes as the AC power supply 12 approaches the power reception coil 51. For this reason, the self-excited oscillation circuit can detect the relative position between the power transmission coil 11 and the power reception coil 51 by a change in the oscillation frequency, and can be used together with the position detection controller 14.

  Each power transmission coil 11 is moved by the moving mechanism 13 so as to approach the power receiving coil 51. The moving mechanism 13 of FIGS. 2 to 4 includes a plurality of sets of driving mechanisms 40 that can move each power transmission coil 11 independently along the inner surface of the upper surface plate 21. Each drive mechanism 40 includes a Y-axis drive mechanism 40B and an X-axis drive mechanism 40A that move the power transmission coil 11 in a direction crossing each other.

  The Y-axis drive mechanism 40B includes a leaf spring 41 formed by connecting the power transmission coil 11 to the tip, a winding shaft 42 that winds up the leaf spring 41, and a forward rotation of the winding shaft 42 to rotate the leaf spring 41. A Y-axis actuator 43 is provided that winds around the take-up shaft 42 and reverses and feeds the leaf spring 41 from the take-up shaft 42 to move the power transmission coil 11 in the Y-axis direction that is the longitudinal direction of the leaf spring 41. .

  The X-axis drive mechanism 40 </ b> A includes an X-axis guide 44 that moves the winding shaft 42 in the X-axis direction, and an X-axis actuator 45 that moves the winding shaft 42 along the X-axis guide 44. The Y-axis actuator 43 and the X-axis actuator 45 are stepping motors. The rotation angle of the actuator of the stepping motor is controlled by the position detection controller 14 to move the power transmission coil 11 in the X-axis direction and the Y-axis direction. However, the actuator is not limited to the stepping motor and can be a servo motor. Furthermore, the Y-axis actuator can be rotated while controlling the take-up shaft, and the X-axis actuator can be moved while controlling the take-up shaft in the X-axis direction, such as position control. A cylinder or the like can also be used.

  In this moving mechanism 13, the position detection controller 14 detects the position of each battery built-in device 50, and controls the Y-axis actuator 43 and the X-axis actuator 45 provided in each drive mechanism 40. The power transmission coil 11 approaches the power reception coil 51 of each battery built-in device 50, and power is transferred from the power transmission coil 11 to the power reception coil 51 to charge the internal battery 52 of the battery built-in device 50. The position detection controller 14 detects the position of each battery built-in device 50, determines which power transmission coil 11 can approach the power reception coil 51 from the detected position information, and determines each set of drive mechanisms 40. The Y-axis actuator 43 and the X-axis actuator 45 are controlled so that each power transmission coil 11 approaches the power reception coil 51. The position detection controller 14 approaches the first power transmission coil 11 specified in advance to the power receiving coil 51 of the battery built-in device 50 to be detected first, and then detects the power receiving coil 51 of the battery built-in device 50 detected next. The drive mechanism 40 is controlled so that the second power transmission coil 11 approaches. Further, when the power transmission coil 11 becomes inaccessible to the power reception coil 51 in this order, the second power transmission coil 11 approaches the power reception coil 51 of the battery built-in device 50 detected first, and the battery built-in detected later. The first power transmission coil 11 is brought close to the power reception coil 51 of the device 50. In addition, the position detection controller 14 stores in advance a region where the first power transmission coil 11 can move and a region where the second power transmission coil 11 can move, and the first power transmission coil 11 and the information stored therein. It is also possible to specify the power receiving coil 51 of the battery built-in device 50 that makes the second power transmitting coil 11 approach.

  The leaf spring 41 is an elongated strip having a predetermined lateral width, and is made of a metal plate or a hard plastic plate that can be elastically deformed so as to be wound around the winding shaft 42. The leaf spring 41 moves the power transmission coil 11 in the longitudinal Y-axis direction while preventing lateral movement of the power transmission coil 11, that is, movement in the X-axis direction. The leaf spring 41 has a wider lateral width and can more reliably prevent lateral movement. However, if the width is too wide, the winding torque of the winding shaft 42 increases. Therefore, the lateral width of the leaf spring 41 is set to 1 cm to 3 cm so that the lateral direction of the power transmission coil 11 is blocked and can move smoothly in the longitudinal direction. Further, as shown in the enlarged end view of FIG. 7, the leaf spring 41 is a ribbon-like thin plate in which the extruded portion fed out linearly from the take-up shaft 42 curves in a cross-sectional shape intersecting the longitudinal direction in an arch shape. It is said. The leaf spring 41 of a ribbon-like thin plate is made thin so that it can be wound around the winding shaft 42 with a small torque, while preventing the waveform deformation in the vertical direction of the extruded portion that has been extruded linearly, thereby preventing the power transmission coil 11 from being wound. There is a feature that can be pushed out more reliably. The leaf spring 41 has the power transmission coil 11 fixed to the front end portion and the rear end portion fixed to the winding shaft 42. The leaf spring 41 is wound around the winding shaft 42 that rotates in the forward direction and is fed out from the winding shaft 42 that rotates in the reverse direction to move the power transmission coil 11 in the Y-axis direction.

  The X-axis drive mechanism 40A in FIG. 2 includes a rack 46 fixed to the take-up shaft 42 and a pinion 47 that meshes with the rack 46 and moves the rack 46 along the X-axis guide 44. In the X-axis drive mechanism 40A in this figure, a plurality of pinions 47 are arranged at predetermined intervals in the movement direction of the rack 46. In the X-axis drive mechanism 40A of FIG. 2, the two pinions 47 are arranged apart from each other. In order to rotate each pinion 47, a worm 48 rotated by the X-axis actuator 45 is disposed at a position where it engages with the pinion 47. The X-axis drive mechanism 40A rotates the worm 48 by the stepping motor of the X-axis actuator 45, rotates both pinions 47 by the worm 48, and moves the rack 46 in the X-axis direction.

  Further, the drive mechanism 40 of FIG. 2 includes a carriage 26 connected to the X-axis guide 44 so that the power transmission coil 11 can be moved along the X-axis guide 44, and a rack 46 is provided on the carriage 26. The winding shaft 42 is rotatably connected. The carriage 26 is made of plastic, and a rack 46 is integrally formed. Further, the carriage 26 is integrally formed with a guide ring 27 provided with guide holes 27A through which the X-axis guide 44 can be rotated and moved in the axial direction at both ends thereof. ing. The carriage 26 has a structure capable of moving along the X-axis guide 44 by inserting the X-axis guide 44 through guide holes 27A of guide rings 27 provided at both ends.

  The X-axis drive mechanism 40A rotates the worm 48 with the stepping motor of the X-axis actuator 45 to rotate the pinion 47, reciprocates the rack 46 that meshes with the rotating pinion 47, and winds the winding through the rack 46. The carriage 26 connecting the take-up shaft 42 is reciprocated along the X-axis guide 44. The X-axis drive mechanism 40 </ b> A can move the winding shaft 42 along the X-axis guide 44 by switching between forward rotation and reverse rotation of the stepping motor of the X-axis actuator 45 and reciprocating the carriage 26.

  Further, the drive mechanism 40 in FIG. 2 rotates the X-axis guide 44 to rotate the winding shaft 42 forward or backward. In order to realize this, the X-axis guide 44 is connected to the side wall 20A of the case 20 so that the X-axis guide 44 can be rotated, and the winding shaft 42 is connected to the X-axis guide 44 so that it can move in the axial direction without rotating. It is connected. Further, the X-axis guide 44 is connected to the end of the stepping motor of the Y-axis actuator 43 via a gear 49 so that the X-axis guide 44 is rotated forward and reverse by the stepping motor. In the drive mechanism 40, the stepping motor of the Y-axis actuator 43 rotates the X-axis guide 44, and the winding shaft 42 can rotate in the normal direction and the reverse direction. This Y-axis drive mechanism 40B can fix the Y-axis actuator 43 to the case 20 and move the power transmission coil 11 in the Y-axis direction.

  The charging stand shown in FIGS. 2 to 4 includes two power transmission coils 11 and two sets of drive mechanisms 40. In the two sets of drive mechanisms 40, X-axis guides 44 are disposed on two opposing sides of the rectangular top plate 21. The charging stand 10 can be charged together by placing two battery built-in devices 50 on the case 20. The charging stand of the present invention does not specify two power transmission coils. As shown in FIG. 8, the charging stand includes three power transmission coils 11 and three sets of driving mechanisms 40, and can charge the built-in battery of the three battery built-in devices. The charging stand 70 is provided with X-axis guides 44 on three sides of the quadrangle. In addition, as shown in FIG. 9, the charging stand can be provided with four sets of drive mechanisms 40 such that the X-axis guides 44 of the respective drive mechanisms 40 are positioned on four sides of the rectangle. The charging stand 80 has a structure in which the four power transmission coils 11 are moved by the respective drive mechanisms 40 and can charge together the built-in batteries of the four battery-equipped devices. Furthermore, although not shown in the drawing, the top plate is a polygon having a pentagon or more, and an X-axis guide is provided in parallel with each outer periphery so that five or more power transmission coils can be moved by five or more sets of driving mechanisms. The built-in batteries of five or more battery-equipped devices can be charged together.

  The position detection controller 14 detects the position of the battery built-in device 50 placed on the top plate 21. The position detection controller 14 of FIGS. 5 and 6 detects the position of the power receiving coil 51 built in the battery built-in device 50, and causes the power transmitting coil 11 to approach the power receiving coil 51. Further, the position detection controller 14 includes a first position detection controller 14A that roughly detects the position of the power receiving coil 51, and a second position detection controller 14B that precisely detects the position of the power receiving coil 51. The position detection controller 14 roughly detects the position of the power receiving coil 51 by the first position detection controller 14A, and controls the moving mechanism 13 to bring the position of the power transmitting coil 11 closer to the power receiving coil 51. Further, the moving mechanism 13 is controlled while precisely detecting the position of the power receiving coil 51 by the second position detection controller 14B, so that the position of the power transmitting coil 11 is brought close to the power receiving coil 51 accurately. The charging stand 10 can bring the power transmission coil 11 close to the power reception coil 51 quickly and more accurately.

  As shown in FIG. 6, the first position detection controller 14 </ b> A includes a plurality of position detection coils 30 fixed to the inner surface of the upper surface plate 21, and a pulse power supply 31 that supplies a pulse signal to the position detection coil 30. A receiving circuit 32 that receives an echo signal that is excited by a pulse supplied from the pulse power source 31 to the position detection coil 30 and that is output from the power receiving coil 51 to the position detection coil 30, and an echo signal that the receiving circuit 32 receives And an identification circuit 33 for determining the position of the power transmission coil 11.

  The position detection coil 30 includes a plurality of rows of coils, and the plurality of position detection coils 30 are fixed to the inner surface of the upper surface plate 21 at a predetermined interval. The position detection coil 30 includes a plurality of X-axis detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis detection coils 30B that detect a position in the Y-axis direction. Each X-axis detection coil 30A has a loop shape elongated in the Y-axis direction, and the plurality of X-axis detection coils 30A are fixed to the inner surface of the upper surface plate 21 at a predetermined interval. The interval (d) between the adjacent X-axis detection coils 30A is smaller than the outer diameter (D) of the power receiving coil 51. Preferably, the interval (d) between the X-axis detection coils 30A is equal to the outer diameter (D) of the power receiving coil 51. 1 times to 1/4 times. The X-axis detection coil 30A can accurately detect the position of the power receiving coil 51 in the X-axis direction by narrowing the interval (d). Each Y-axis detection coil 30B has a loop shape elongated in the X-axis direction, and the plurality of Y-axis detection coils 30B are fixed to the inner surface of the upper surface plate 21 at a predetermined interval. Similarly to the X-axis detection coil 30A, the interval (d) between the adjacent Y-axis detection coils 30B is also smaller than the outer diameter (D) of the power receiving coil 51, and preferably the interval (d) between the Y-axis detection coils 30B. The outer diameter (D) of the power receiving coil 51 is set to 1 to 1/4 times. The Y-axis detection coil 30B can also accurately detect the position of the power receiving coil 51 in the Y-axis direction by narrowing the interval (d).

  The pulse power supply 31 outputs a pulse signal to the position detection coil 30 at a predetermined timing. The position detection coil 30 to which the pulse signal is input excites the power receiving coil 51 that approaches with the pulse signal. The excited power receiving coil 51 outputs an echo signal to the position detection coil 30 with the energy of the flowing current. Therefore, as shown in FIG. 10, the position detection coil 30 near the power receiving coil 51 induces an echo signal from the power receiving coil 51 with a predetermined time delay after the pulse signal is input. The echo signal induced in the position detection coil 30 is output to the identification circuit 33 by the reception circuit 32. Therefore, the identification circuit 33 determines whether or not the power receiving coil 51 is approaching the position detection coil 30 with the echo signal input from the receiving circuit 32. When echo signals are induced in the plurality of position detection coils 30, the identification circuit 33 determines that the position detection coil 30 with the highest echo signal level is closest.

  The first position detection controller 14 </ b> A shown in FIG. 6 connects each position detection coil 30 to the reception circuit 32 via the switching circuit 34. Since the first position detection controller 14A switches the inputs in order and connects them to the plurality of position detection coils 30, the single reception circuit 32 can detect the echo signals of the plurality of position detection coils 30. However, an echo signal can also be detected by connecting a receiving circuit to each position detection coil.

  The first position detection controller 14 </ b> A in FIG. 6 switches the plurality of position detection coils 30 in order by the switching circuit 34 controlled by the identification circuit 33 and connects it to the reception circuit 32. The pulse power supply 31 is connected to the output side of the switching circuit 34 and outputs a pulse signal to the position detection coil 30. The level of the pulse signal output from the pulse power supply 31 to the position detection coil 30 is extremely higher than the echo signal from the power receiving coil 51. The receiving circuit 32 has a limiter circuit 35 made of a diode connected to the input side. The limiter circuit 35 limits the signal level of the pulse signal input from the pulse power supply 31 to the reception circuit 32 and inputs the pulse signal to the reception circuit 32. An echo signal having a low signal level is input to the receiving circuit 32 without being limited. The receiving circuit 32 amplifies and outputs both the pulse signal and the echo signal. The echo signal output from the receiving circuit 32 is a signal delayed from the pulse signal by a predetermined timing, for example, several μsec to several hundred μsec. Since the delay time that the echo signal is delayed from the pulse signal is a fixed time, the signal after a predetermined delay time from the pulse signal is used as an echo signal, and the receiving coil 51 approaches the position detection coil 30 from the level of this echo signal. Determine whether or not.

  The reception circuit 32 is an amplifier that amplifies and outputs an echo signal input from the position detection coil 30. The receiving circuit 32 outputs a pulse signal and an echo signal. The identification circuit 33 determines whether or not the power reception coil 51 is set close to the position detection coil 30 from the pulse signal and echo signal input from the reception circuit 32. The identification circuit 33 includes an A / D converter 36 that converts a signal input from the reception circuit 32 into a digital signal. The digital signal output from the A / D converter 36 is calculated to detect an echo signal. The identification circuit 33 detects a signal input after a specific delay time from the pulse signal as an echo signal, and further determines whether the power receiving coil 51 is approaching the position detection coil 30 from the level of the echo signal.

  The identification circuit 33 detects the position of the power receiving coil 51 in the X-axis direction by controlling the switching circuit 34 so that the plurality of X-axis detection coils 30A are connected to the receiving circuit 32 in order. The identification circuit 33 outputs a pulse signal to the X-axis detection coil 30A connected to the reception circuit 32 every time each X-axis detection coil 30A is connected to the reception circuit 32, and has a specific delay time from the pulse signal. Later, whether or not the power receiving coil 51 is approaching the X-axis detection coil 30A is determined based on whether or not an echo signal is detected. The identification circuit 33 connects all the X-axis detection coils 30A to the reception circuit 32, and determines whether or not the power reception coils 51 are close to the respective X-axis detection coils 30A. When the power receiving coil 51 approaches one of the X axis detection coils 30 </ b> A, an echo signal is detected in a state where the X axis detection coil 30 </ b> A is connected to the reception circuit 32. Therefore, the identification circuit 33 can detect the position of the power receiving coil 51 in the X-axis direction from the X-axis detection coil 30A that can detect an echo signal. In a state in which the power receiving coil 51 approaches across the plurality of X-axis detection coils 30A, echo signals are detected from the plurality of X-axis detection coils 30A. In this state, the identification circuit 33 determines that it is closest to the X-axis detection coil 30A from which the strongest echo signal, that is, the echo signal having a high level is detected. The identification circuit 33 similarly controls the Y-axis detection coil 30B to detect the position of the power receiving coil 51 in the Y-axis direction.

  Further, as shown by the chain line in FIG. 6, the first position detection controller 14A causes the identification circuit 33 to detect the level of the echo signal induced in each position detection coil 30 with respect to the position of the power receiving coil 51, that is, FIG. As shown in FIG. 4, a storage circuit 37 that stores the level of an echo signal that is induced after a predetermined time has elapsed by exciting each position detection coil 30 with a pulse signal can be provided. The first position detection controller 14A detects the level of the echo signal induced in each position detection coil 30, and compares the level of the detected echo signal with the level of the echo signal stored in the storage circuit 37. Thus, the position of the power receiving coil 51 can be detected.

  The first position detection controller 14A including the storage circuit 37 can determine the position of the power receiving coil 51 from the level of the echo signal induced in each position detection coil 30 as follows. FIG. 11 shows the level of the echo signal induced in the X-axis position detection coil 30A in a state where the power receiving coil 51 is moved in the X-axis direction, and the horizontal axis shows the position of the power receiving coil 51 in the X-axis direction. The vertical axis indicates the level of the echo signal induced in each X-axis position detection coil 30A. The first position detection controller 14A can determine the position of the power receiving coil 51 in the X-axis direction by detecting the level of the echo signal induced in each X-axis position detection coil 30A. As shown in this figure, when the power receiving coil 51 is moved in the X-axis direction, the level of the echo signal induced in each X-axis position detection coil 30A changes. For example, when the center of the power receiving coil 51 is at the center of the first X-axis position detection coil 30A, the level of the echo signal induced in the first X-axis position detection coil 30A as shown by the point A in FIG. Is the strongest. When the power receiving coil 51 is in the middle of the first X-axis position detection coil 30A and the second X-axis position detection coil 30A, as shown by a point B in FIG. 11, the first X-axis position detection coil 30A. And the level of the echo signal induced in the second X-axis position detection coil 30A is the same. That is, in each X-axis position detection coil 30A, the level of the echo signal that is induced when the power receiving coil 51 is closest is the strongest, and the level of the echo signal decreases as the power receiving coil 51 moves away. Therefore, it can be determined which X-axis position detection coil 30A is closest to the power receiving coil 51 depending on which X-axis position detection coil 30A has the strongest echo signal level. Also, when an echo signal is induced in the two X-axis position detection coils 30A, in which direction the echo signal is induced from the X-axis position detection coil 30A that detects a strong echo signal. Thus, it can be determined in which direction the power receiving coil 51 is shifted from the X-axis position detecting coil 30A having the strongest echo signal, and the relative position between the two X-axis position detecting coils 30A can be determined by the level ratio of the echo signal. Can be judged. For example, if the level ratio of the echo signals of the two X-axis position detection coils 30A is 1, it can be determined that the power receiving coil 51 is located at the center of the two X-axis position detection coils 30A.

  The storage circuit 37 stores the level of the echo signal induced in each Y-axis position detection coil 30A with respect to the position of the power receiving coil 51 in the Y-axis direction. When the power receiving coil 51 is placed, an echo signal is induced in one of the X-axis position detection coils 30A. Therefore, the identification circuit 33 detects that the power receiving coil 51 has been placed by an echo signal induced in the X-axis position detection coil 30A, that is, that the battery built-in device 50 has been placed on the charging stand 10. Further, the level of the echo signal induced in any of the X-axis position detection coils 30 </ b> A can be compared with the level stored in the storage circuit 37 to determine the position of the power receiving coil 51 in the X-axis direction. . The identification circuit stores in the storage circuit a function that specifies the position of the receiving coil in the X-axis direction from the level ratio of the echo signal induced in the adjacent X-axis position detection coil, and determines the position of the receiving coil from this function You can also This function is obtained by moving the power receiving coil between the two X-axis position detection coils and detecting the level ratio of the echo signal induced in each X-axis position detection coil. The identification circuit 33 detects the level ratio of echo signals induced in the two X-axis position detection coils 30A, and receives power between the two X-axis position detection coils 30A based on this function from the detected level ratio. The position of the coil 51 in the X-axis direction can be calculated and detected.

  The above shows a method in which the identification circuit 33 detects the position of the power receiving coil 51 in the X-axis direction from the echo signal induced in the X-axis position detection coil 30A, but the position of the power receiving coil 51 in the Y-axis direction is also X. In the same manner as in the axial direction, it can be detected from the echo signal induced in the Y-axis position detection coil 30B.

  When the echo signal having the waveform as described above is detected, the charging base identification circuit 33 can recognize and identify that the power receiving coil 51 of the battery built-in device 50 is mounted. When a waveform different from the waveform of the echo signal is detected and identified, the power supply can be stopped assuming that a device other than the power receiving coil 51 (for example, a metal foreign object) of the battery built-in device 50 is mounted. When the waveform of the echo signal is not detected or identified, the power supply coil 51 of the battery built-in device 50 is not mounted and power is not supplied.

  When the identification circuit 33 detects the positions of the power receiving coil 51 in the X-axis direction and the Y-axis direction, the first position detection controller 14 </ b> A connects the power transmission coil 11 to the power receiving coil 51 with the position signal from the identification circuit 33. Move to position. The identification circuit 33 controls the moving mechanism 13 from the detected X-axis direction and Y-axis direction positions to move the power transmission coil 11 to a position approaching the power reception coil 51. The identification circuit 33 controls the X-axis drive mechanism 40A of the movement mechanism 13 to move the power transmission coil 11 to the position of the power reception coil 51 in the X-axis direction. Further, the identification circuit 33 controls the Y-axis drive mechanism 40B of the moving mechanism 13 to move the power transmission coil 11 to the position of the power reception coil 51 in the Y-axis direction.

  In the state where one battery built-in device 50 is placed on the upper surface plate 21, the charging base 10 specifies the position of the power receiving coil 51 by the first position detection controller 14A, controls the moving mechanism 13, and transmits the power transmitting coil. 11 is moved to a position approaching the power receiving coil 51. However, the first position detection controller 14 </ b> A sets the position of the power receiving coil 51 as a plurality of candidate points without specifying the position of the power receiving coil 51 in a state where the plurality of battery built-in devices 50 are placed on the upper surface plate 21. To detect. For example, as shown in FIG. 12, in the state where two battery built-in devices 50 are placed on the top plate 21, the first position detection controller 14 </ b> A detects four candidate points as the positions of the power receiving coil 51. To do. FIG. 12 shows a state in which the first battery built-in device 50A is placed on the point A on the upper surface plate 21, and the second battery built-in device 50B is placed on the B point. At this time, the first position detection controller 14A detects the echo signal from the power receiving coil 51 with the first X-axis position detection coil 30A and the third X-axis position detection coil 30A, and the first Y-axis The echo signal from the power receiving coil 51 is detected by the position detection coil 30B and the fourth Y-axis position detection coil 30B. That is, the first position detection controller 14A detects the line m1 including the point A by the first X-axis position detection coil 30A as the position of the power receiving coil in the X-axis direction, and detects the line m2 including the point B as the first position. 3 X-axis position detection coil 30A. Further, the first position detection controller 14A detects the line n1 including the point A as the position of the power receiving coil 51 in the Y-axis direction by the first Y-axis position detection coil 30B, and detects the line n2 including the point B. Detection is performed by the fourth Y-axis position detection coil 30B. Accordingly, the first position detection controller 14 </ b> A detects the four points of the points A to D, which are the intersections of the line m <b> 1 and the line m <b> 2, and the line n <b> 1 and the line n <b> 2, as candidate points indicating the position of the power receiving coil 51. . Similarly, the first position detection controller detects nine candidate points as positions of the power receiving coil, although not shown, in a state where three battery built-in devices are placed on the top plate. However, when the positions of the power receiving coils of the plurality of battery built-in devices are on the same line detected by the first position detection controller, the number of candidate points detected is reduced. For example, if two power receiving coils are on the same line in either the X-axis direction or the Y-axis direction with two battery built-in devices mounted, the first position detection controller detects it. There are two candidate points for the receiving coil, and the positions of the two receiving coils are thereby specified. In addition, when two power receiving coils are on the same line in either the X-axis direction or the Y-axis direction with three battery built-in devices mounted, the first position detection controller detects it. Receiving carp. There are four or six candidate points, and if all three power receiving coils are on the same line, there are three power receiving coil candidate points. Therefore, in a state where a plurality of battery built-in devices are mounted, the number of candidate points as the position of the power receiving coil detected by the first position detection controller varies depending on the number and position of the battery built-in devices on which the top plate is mounted.

  The charging stand 10 detects the exact position of the power receiving coil 51 from the detection position of the power receiving coil 51 roughly detected by the first position detection controller 14A, and is detected by the first position detection controller 14A. A second position detection controller 14B that detects the position of the power receiving coil 51 from the candidate points of the power receiving coil 51 is provided. The charging stand 10 is configured such that after the power transmission coil 11 is moved closer to the detection position of the power receiving coil 51 roughly detected by the first position detection controller 14A, the power receiving coil 11 is moved by the second position detection controller 14B. The second position detection control is performed after the accurate position of 51 is detected or the power transmission coil 11 is moved closer to the plurality of power receiving coil candidate points detected by the first position detection controller 14A. The correct position of the power receiving coil 51 is detected by the device 14B.

  The second position detection controller 14B controls the moving mechanism 13 by accurately detecting the position of the power transmission coil 11 from the oscillation frequency of the self-excited oscillation circuit using the AC power supply 12 as a self-excited oscillation circuit. The second position detection controller 14B controls the X-axis drive mechanism 40A and the Y-axis drive mechanism 40B of the moving mechanism 13 so as to move the power transmission coil 11 in the X-axis direction and the Y-axis direction. Detect the oscillation frequency. FIG. 13 shows the characteristic that the oscillation frequency of the self-excited oscillation circuit changes. This figure shows the change of the oscillation frequency with respect to the relative displacement between the power transmission coil 11 and the power reception coil 51. As shown in this figure, the oscillation frequency of the self-excited oscillation circuit is highest at a position where the power transmission coil 11 is closest to the power reception coil 51, and the oscillation frequency is lowered as the relative position is shifted. Therefore, the second position detection controller 14B controls the X-axis drive mechanism 40A of the moving mechanism 13 to move the power transmission coil 11 in the Y-axis direction and stops at the position where the oscillation frequency is highest. The Y-axis drive mechanism 40B is similarly controlled to move the power transmission coil 11 in the X-axis direction and stop at the position where the oscillation frequency is highest. As described above, the second position detection controller 14B moves the power transmission coil 11 to the position closest to the power reception coil 51 and can accurately detect the exact position of the power reception coil 51. In addition, when the second position detection controller 14B detects the accurate position of the power receiving coil 51 from a plurality of candidate points, the second position detection controller 14B is an imaginary point where there is no power receiving coil, such as points C and D in FIG. Even at the candidate point, it can be detected from the oscillation frequency of the oscillation circuit that there is no power receiving coil.

  In the above charging stand, the first position detection controller 14A roughly detects the position of the power receiving coil 51, and after detecting a plurality of candidate points, the second position detection controller 14B further detects the accuracy of the power receiving coil 51. A precise position is detected and the power transmission coil 11 is brought close to the power reception coil 51.

  The second position detection controller 14B shown in FIG. 5 determines the relative position between the power transmission coil 11 and the power reception coil 51 from the change in the oscillation frequency of the self-excited oscillation circuit. The second position detection controller 14B determines the relative position between the power transmission coil and the power reception coil. The second position detection controller for fine adjustment detects the relative position of the power transmission coil with respect to the power reception coil from the voltage of the power transmission coil, the power consumption of the AC power supply that supplies power to the power transmission coil, or the current induced in the power reception coil. be able to. Since the second position detection controller does not need to change the oscillation frequency, it can be a separately-excited oscillation circuit.

  In FIG. 14, the second position detection controller 14 </ b> C that detects the relative position of the power transmission coil 11 with respect to the power reception coil 51 from the voltage of the power transmission coil 11 includes a voltage detection circuit 63 that detects the voltage of the power transmission coil 11. . The second position detection controller 14 </ b> C moves the power transmission coil 11 and detects the voltage of the power transmission coil 11 with the voltage detection circuit 63. The characteristic that the voltage of the power transmission coil 11 changes with respect to the relative position of the power transmission coil 11 and the power reception coil 51 is shown in FIG. This figure shows a change in the voltage of the power transmission coil 11 with respect to the relative displacement between the power transmission coil 11 and the power reception coil 51. As shown in this figure, the voltage of the power transmission coil 11 is lowest at the position where the power transmission coil 11 is closest to the power reception coil 51, and the voltage is increased as the relative position is shifted. Therefore, the second position detection controller 14C controls the X-axis drive mechanism 40A of the moving mechanism 13 to move the power transmission coil 11 in the X-axis direction, and stops at a position where the voltage of the power transmission coil 11 is lowest. In addition, the Y-axis drive mechanism 40B is similarly controlled to move the power transmission coil 11 in the Y-axis direction and stop at a position where the voltage of the power transmission coil 11 is lowest. The second position detection controller 14 </ b> C can detect the exact position of the power receiving coil 51 by moving the power transmitting coil 11 to the position closest to the power receiving coil 51 as described above.

  In FIG. 14, the second position detection controller 14 </ b> C that detects the relative position of the power transmission coil 11 with respect to the power reception coil 51 from the power consumption of the AC power supply 12 that supplies power to the power transmission coil 11 A power consumption detection circuit 64 is detected. The second position detection controller 14 </ b> C moves the power transmission coil 11 and detects the power consumption of the AC power supply 12 by the power consumption detection circuit 64. The characteristic that the power consumption of the AC power supply 12 changes with respect to the relative position of the power transmission coil 11 and the power reception coil 51 is shown in FIG. This figure shows a change in power consumption of the AC power supply 12 with respect to a relative displacement between the power transmission coil 11 and the power reception coil 51. As shown in this figure, the power consumption of the AC power supply 12 is the smallest at the position where the power transmission coil 11 is closest to the power receiving coil 51, and the power consumption is increased as the relative position is shifted. Accordingly, the second position detection controller 14C controls the X-axis drive mechanism 40A of the moving mechanism 13 to move the power transmission coil 11 in the X-axis direction, and stops at a position where the power consumption of the AC power supply 12 is minimized. . The Y-axis drive mechanism 40B is similarly controlled to move the power transmission coil 11 in the Y-axis direction and stop at a position where the power consumption of the AC power supply 12 is lowest. As described above, the second position detection controller 14 </ b> C moves the power transmission coil 11 to the position closest to the power reception coil 51 to detect the accurate position of the power reception coil 51.

  Further, in FIG. 14, the second position detection controller 14 </ b> C that detects the relative position of the power transmission coil 11 with respect to the power reception coil 51 from the current of the power reception coil 51 includes a detection circuit 65 that detects the current of the power reception coil 51. Yes. The battery built-in device 50 changes the impedance of the power receiving coil 51 by connecting a capacitor to the power receiving coil 51 or outputs an AC signal having a frequency different from that of the AC power source 12 to the power receiving coil 51. The impedance of the power receiving coil 51 is detected via the power transmission coil, or an AC signal is received by the power transmission coil 11, and the current of the power receiving coil 51 is detected by the detection circuit 17. Further, the battery built-in device 50 outputs a signal that modulates the carrier wave of a specific frequency with the current signal of the power receiving coil 51 to the power receiving coil 51, and the charging base 10 receives the carrier wave of the specific frequency, demodulates this signal, and receives the power receiving coil. Current can also be detected. Furthermore, the current information can also be transmitted by wirelessly transmitting the current signal of the power receiving coil from the battery built-in device to the charging stand. The second position detection controller 14 </ b> C detects the current of the power receiving coil 51 by moving the power transmitting coil 11. FIG. 17 shows characteristics in which the current of the power receiving coil 51 changes with respect to the relative position between the power transmitting coil 11 and the power receiving coil 51. This figure shows the change of the power receiving coil 51 with respect to the relative displacement between the power transmitting coil 11 and the power receiving coil 51. As shown in this figure, the current of the power receiving coil 51 is the largest at the position where the power transmitting coil 11 is closest to the power receiving coil 51, and the current becomes smaller as the relative position is shifted. Accordingly, the second position detection controller 14C controls the X-axis drive mechanism 40A of the moving mechanism 13 to move the power transmission coil 11 in the X-axis direction, and stops at a position where the current of the power reception coil 51 becomes the largest. The Y-axis drive mechanism 40B is similarly controlled to move the power transmission coil 11 in the Y-axis direction and stop at a position where the current of the power reception coil 51 becomes the largest. As described above, the second position detection controller 14 </ b> C moves the power transmission coil 11 to the position closest to the power reception coil 51 to detect the accurate position of the power reception coil 51.

  The above moving mechanism 13 moves the power transmission coil 11 in the X-axis direction and the Y-axis direction and moves the power transmission coil 11 to the position of the power receiving coil 51. However, in the present invention, the movement mechanism is in the X-axis direction and the Y-axis direction. The power transmission coil can be moved in various directions to move closer to the power reception coil without specifying the structure in which the power transmission coil is moved in the axial direction and the position of the power transmission coil approaches the power reception coil.

  In the state where the plurality of battery built-in devices 50 are placed on the upper surface plate 21, the above charging base 10 detects the plurality of candidate points of the power receiving coil 51 by the first position detection controller 14A, and then performs the second position detection. The controllers 14B and 14C accurately detect the exact position of the power receiving coil 51, and the power transmitting coil 11 is brought close to the power receiving coil 51. However, the position detection controller can specify the position of the power receiving coil without detecting a plurality of candidate points in a state where a plurality of battery built-in devices are placed on the upper surface plate by adopting the configuration shown below. .

  A position detection controller 84 shown in FIG. 18 includes a plurality of position detection coils 30 fixed to the inner surface of the upper surface plate, a pulse power supply 31 that supplies a pulse signal to the position detection coil 30, and positions from the pulse power supply 31. A reception circuit 32 that receives an echo signal that is excited by a pulse supplied to the detection coil 30 and that is output from the power reception coil 51 to the position detection coil 30, and a position of the power transmission coil 11 is determined from the echo signal that the reception circuit 32 receives. And an identification circuit 93. The plurality of position detection coils 30 includes a plurality of X-axis detection coils 30 </ b> A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis detection coils 30 </ b> B that detect positions in the Y-axis direction. The position detection controller 84 converts an echo signal excited by the pulse signal and output from the power receiving coil 51 into an X-axis detection coil while the pulse power supply 31 supplies a pulse signal to any one of the position detection coils 30. The signal is received by both 30A and the Y-axis detection coil 30B, and the position of the power receiving coil 51 is determined. Further, the position detection controller 84 sets the level of the echo signal induced in each position detection coil 30 relative to the position of the power receiving coil 51 to the identification circuit 93, that is, as shown in FIG. A storage circuit 97 is provided for storing the level of an echo signal that is induced after a predetermined time has elapsed after being excited by a pulse signal. The identification circuit 93 detects the level of the echo signal induced in each position detection coil 30, compares the level of the detected echo signal with the level of the echo signal stored in the storage circuit 97, and receives the receiving coil 51. The position of is detected.

  The position detection controller 84 supplies a pulse signal from the pulse power supply 31 to the specific position detection coil 30 and transmits an echo signal output from the power receiving coil 51 in both the X-axis detection coil 30A and the Y-axis detection coil 30B. In order to receive, a switching circuit 94 is provided that switches the plurality of X-axis detection coils 30A and the plurality of Y-axis detection coils 30B separately to connect to the pulse power supply 31 and the reception circuit 32. Further, the position detection controller 84 shown in the figure includes an input switching circuit 95 that controls the connection state between the switching circuit 94 and the pulse power supply 31, and a reception switching circuit 96 that controls the connection state between the switching circuit 94 and the receiving circuit 32. And.

  The switching circuit 94 includes an X-axis switching circuit 94A that switches a plurality of X-axis detection coils 30A in order, and a Y-axis switching circuit 94B that switches a plurality of Y-axis detection coils 30B in order. The X-axis switching circuit 94A and the Y-axis switching circuit 94B are connected to the pulse power supply 31 via the input switching circuit 95, respectively. The input switching circuit 95 is controlled by the identification circuit 93 to switch and input the pulse output from the pulse power supply 31 to the X axis switching circuit 94A and the Y axis switching circuit 94B. According to this circuit configuration, the output of one pulse power supply 31 can be switched to supply a pulse signal to the X-axis detection coil 30A and the Y-axis detection coil 30B. However, the position detection controller can also be provided with a pulse power supply that separately supplies a pulse signal to the X-axis detection coil and the Y-axis detection coil without providing an input switching circuit. Further, the X-axis switching circuit 94A and the Y-axis switching circuit 94B are connected to the receiving circuit 32 via the receiving switching circuit 96, respectively. The reception switching circuit 96 is controlled by the identification circuit 93 to switch the connection state between the X-axis switching circuit 94A and the Y-axis switching circuit 94B and the receiving circuit 32, and the echo signal received by the X-axis detection coil 30A and the Y-axis The echo signal received by the detection coil 30B is separately input to the receiving circuit 32. The position detection controller 84 can detect echo signals from the X-axis detection coil 30 </ b> A and the Y-axis detection coil 30 </ b> B by one reception circuit 32 by switching the input by the reception switching circuit 96. However, each echo signal can be detected by separately connecting a receiving circuit to the X-axis switching circuit and the Y-axis switching circuit. According to this circuit configuration, the echo signal output from the power receiving coil is connected to the receiving circuit connected to the X-axis switching circuit and the Y-axis switching circuit while supplying a pulse signal to any of the position detection coils. It is possible to receive the signals simultaneously by both of the receiving circuits and to quickly detect the position of the power receiving coil.

  For example, when detecting the positions of the plurality of power receiving coils 51 in the X-axis direction, the position detection controller 84 sets the plurality of X-axis detection coils 30A in the same manner as the first position detection controller 14A. The pulse signal is input to the X-axis detection coil 30A in order and the echo signal excited by this pulse signal and output from the power reception coil 51 is received by the X-axis detection coil 30A. The position of is detected. However, when detecting the position in the Y-axis direction, the X-axis detection coil 30A in which the echo signal is detected in the process of detecting the position in the X-axis direction without inputting a pulse signal to the Y-axis detection coil 30B. The position of the power receiving coil 51 in the Y-axis direction is received by inputting a pulse signal and receiving the echo signal excited by the pulse signal and output from the power receiving coil 51 by sequentially switching the plurality of Y-axis detection coils 30B. To detect. Thus, the position of the power receiving coil 51 is specified by detecting the position of the power receiving coil 51 in the X-axis direction and the position in the Y-axis direction.

The position detection controller 84 shown in FIG. 18 detects the positions of the plurality of power receiving coils 51 as follows.
(1) Detection of the position of the plurality of power receiving coils 51 in the X-axis direction The identification circuit 93 controls the input switching circuit 95 to connect the pulse power supply 31 and the X-axis switching circuit 94A. The shaft switching circuit 94B is disconnected. Further, the identification circuit 93 controls the reception switching circuit 96 so that the X-axis switching circuit 94A and the receiving circuit 32 are connected, and the Y-axis switching circuit 94B and the receiving circuit 32 are disconnected. In this state, the identification circuit 93 controls the X-axis switching circuit 94A to connect the plurality of X-axis detection coils 30A to the reception circuit 32 in order, and connects each X-axis detection coil 30A to the reception circuit 32. Each time, a pulse signal is output from the pulse power supply 31, and an echo signal output from the power receiving coil 51 is detected by the X-axis detection coil 30A. The identification circuit 93 connects all the X-axis detection coils 30A to the reception circuit 32 in order, and determines the positions of the plurality of power reception coils 51 in the X-axis direction from echo signals input to the respective X-axis detection coils 30A. To detect. For example, as shown in FIG. 19, in a state where two battery-equipped devices 50 are placed on the top plate, the identification circuit 93 sets the line m1 including the point A as the position of the power receiving coil 51 in the X-axis direction. 1 is detected by the X-axis position detection coil 30A, and the line m2 including the point B is detected by the third X-axis position detection coil 30A.

(2) Detecting the position of the plurality of power receiving coils 51 in the Y-axis direction The identification circuit 93 controls the reception switching circuit 96 to disconnect the X-axis switching circuit 94A and the receiving circuit 32 from each other. 94B and the receiving circuit 32 are connected. At this time, the input switching circuit 95 keeps the pulse power supply 31 and the X-axis switching circuit 94A in a connected state, and holds the pulse power supply 31 and the Y-axis switching circuit 94B in a disconnected state. In this state, the identification circuit 93 is connected to the X-axis switching circuit so that the pulse power supply 31 is connected to the X-axis detection coil 30A in which the echo signal is detected in the step (1) (step of detecting the position in the X-axis direction). In addition to controlling 94A, the Y-axis switching circuit 94B is controlled so that the plurality of Y-axis detection coils 30B are connected to the receiving circuit 32 in order, and the position of the power receiving coil 51 in the Y-axis direction is detected. Each time the Y-axis detection coil 30B is connected to the reception circuit 32, the identification circuit 93 inputs a pulse signal from the pulse power supply 31 to the X-axis detection coil 30A, and is excited by this pulse signal and output from the receiving coil. The echo signal is detected by the Y-axis detection coil 30B. That is, in FIG. 19, each time the identification circuit 93 connects the pulse power supply 31 to the first X-axis position detection coil 30A and outputs a pulse signal, the plurality of Y-axis position detection coils 30B are switched in order and echoed. The signal is detected, and the line n1 including the point A is detected by the first Y-axis detection coil as the position of the power receiving coil 51 in the Y-axis direction. Further, each time the pulse power supply 31 is connected to the third X-axis position detection coil 30A and a pulse signal is output, the identification circuit 93 switches the Y-axis position detection coil 30B in order to detect an echo signal, As a position of the coil 51 in the Y-axis direction, a line n2 including the point B is detected by the fourth Y-axis detection coil 30B.

(3) Identification of the positions of the plurality of power receiving coils 51 The identification circuit 93 is an intersection of the line m1 detected by the first X-axis detection coil 30A and the line n1 detected by the first Y-axis detection coil 30B. Thus, the position of the power receiving coil 51 of the first battery built-in device 50A is specified as the point A. Further, the identification circuit 93 determines the second battery built-in device 50B from the intersection of the line m2 detected by the third X-axis detection coil 30A and the line n2 detected by the fourth Y-axis detection coil 30B. The position of the power receiving coil 51 is specified as point B.
Further, after the position detection controller 84 specifies the positions of the plurality of power receiving coils 51 by the above method, the plurality of Y axis detection coils 30B are sequentially switched to input a pulse signal to the Y axis detection coil 30B. The echo signal excited by the pulse signal and output from the power receiving coil 51 can be received by the Y axis detection coil 30B, and the position of the power receiving coil 51 in the Y axis direction can be detected more accurately based on this echo signal. .

  When the identification circuit 93 detects the position of the power receiving coil 51 in the X-axis direction and the Y-axis direction, the position detection controller 84 moves the power transmission coil 11 to the position of the power receiving coil 51 with the position signal from the identification circuit 93. Let

  The charging stand 10 controls the moving mechanism 13 with the position detection controllers 14 and 84 to bring the power transmission coils 11 close to the power reception coils 51 of the respective battery built-in devices 50, and the power transmission coil 11 with the AC power supply 12. To supply AC power. The AC power of each power transmission coil 11 is conveyed to each power reception coil 51 and used to charge the battery 52. The battery built-in device 50 that detects that the battery 52 is fully charged stops charging or transmits a full charge signal to the charging stand 10 without stopping charging. The battery built-in device 50 can output a full charge signal to the power receiving coil 51, transmit this full charge signal from the power receiving coil 51 to the power transmission coil 11, and transmit full charge information to the charging stand 10. The battery built-in device 50 connects a capacitor to the power receiving coil 51 to change the impedance of the power receiving coil 51 or outputs an AC signal having a frequency different from that of the AC power source 12 to the power receiving coil 51. The full charge can be detected by detecting the impedance of the power receiving coil 51 via 51 or by receiving the AC signal by the power transmitting coil 11. Further, the battery built-in device 50 outputs a signal that modulates a carrier wave of a specific frequency with a full charge signal to the power receiving coil 51, and the charging stand 10 receives the carrier wave of a specific frequency and demodulates this signal to detect a full charge signal. You can also Furthermore, the battery built-in device can also transmit full charge information by wirelessly transmitting a full charge signal to the charging stand. The battery built-in device has a built-in transmitter that transmits a full charge signal, and the charging stand has a built-in receiver that receives the full charge signal. The position detection controller 14 shown in FIG. 5 incorporates a full charge detection circuit 17 that detects the fully charged internal battery 52. The full charge detection circuit 17 detects a full charge signal output from the battery built-in device 50, and transmits the fully charged battery 52 to the power transmission coil 11 approaching the power receiving coil 51 of the battery built-in device 50. Is stopped, and charging of the battery 52 is stopped.

  The charging stand 10 of the top plate 21 on which a larger number of battery built-in devices 50 than the number of power transmission coils 11 can be placed in order by switching the battery 52 of the battery built-in device 50 to be charged, that is, the built-in battery being charged. When the full charge of 52 is detected, the power transmission coil 11 is moved to the power receiving coil 51 of the battery built-in device 50 that is not charged, and the built-in battery 52 of the next battery built-in device 50 is fully charged. The charging stand 10 first detects the position of the power receiving coil 51 of each battery built-in device 50. For example, when the first to third battery built-in devices 50 are set on the charging stand 10 having two power transmission coils 11 and two sets of drive mechanisms 40, the two power transmission coils 11 are built into the first battery. The built-in battery 52 is charged by approaching the power receiving coil 51 of the device 50A and the second battery-equipped device 50B. When any one of the built-in batteries 52 is fully charged, if the built-in battery 52 of the first battery built-in device 50A is fully charged, the power transmission coil approaching the power receiving coil 51 of the first battery built-in device 50A. After the power supply to 11 is stopped, the power transmission coil 11 is brought close to the power reception coil 51 of the third battery built-in device 50C, AC power is supplied to the power transmission coil 11, and the third battery built-in device 50C is built in. The battery 52 is charged. When the built-in battery 52 of the third battery built-in device 50C is fully charged, the supply of AC power to the power transmission coil 11 approaching the power receiving coil 51 is stopped, and the second battery built-in device 50B is built in. When the battery 52 is fully charged, the supply of AC power to the power transmission coil 11 approaching the power reception coil 51 of the battery built-in device 50 is stopped, and the charging ends. Furthermore, in the state where the two battery built-in devices 50 are set on the upper surface plate 21 and each of the battery built-in devices 50 is charged by the two power transmission coils 11, the third battery built-in device 50 is set. Then, the charging stand 10 fully charges the built-in batteries 52 of all the battery built-in devices 50 as follows. When the built-in battery 52 of any of the battery built-in devices 50 is fully charged, the position detection controllers 14 and 84 redetect the position of each of the battery built-in devices 50. In this state, when it is detected that the battery built-in device 50 is set at a position where it is not charged, the power transmission coil 11 that has charged the fully charged battery built-in device 50 is received by the battery built-in device 50 that is set later. The coil 51 is moved to a position to charge the built-in battery 52 of the battery built-in device 50. In a state where a larger number of battery built-in devices 50 than the number of power transmission coils 11 are set on the upper surface plate 21, the position detection controllers 14 and 84 first detect the positions of the two battery built-in devices 50, respectively. The power transmission coil 11 is brought close to the position of the power receiving coil 51 of the battery built-in device 50 to fully charge the built-in battery 52, and then the position of the battery built-in device 50 is detected again, and the uncharged battery built-in device 50 is detected. , The power transmission coil 11 that has been charged can be moved to the position of the uncharged battery built-in device 50 to charge the built-in battery 52.

  As described above, when a larger number of battery built-in devices 50 than the number of power transmission coils 11 are set on the upper plate 21, the battery built-in devices 50 are sequentially switched to fully charge the built-in battery 52. The charging stand 10 stores the position of the fully-charged battery built-in device 50 and does not charge the battery 52 of the fully-charged battery built-in device 50.

DESCRIPTION OF SYMBOLS 10 ... Charging stand 11 ... Power transmission coil 12 ... AC power supply 13 ... Moving mechanism 14 ... Position detection controller 14A ... 1st position detection controller
14B ... Second position detection controller
14C ... 2nd position detection controller 15 ... Core 15A ... Cylindrical part
15B ... Cylindrical part 16 ... Lead wire 17 ... Full charge detection circuit 20 ... Case 20A ... Side wall 21 ... Top plate 22 ... Horizontal guide 23 ... Guide plate 24 ... Movement space 25 ... Slide convex part 26 ... Carriage 27 ... Guide ring 27A ... Guide hole 30 ... Position detection coil 30A ... X-axis detection coil
30B ... Y-axis detection coil 31 ... Pulse power supply 32 ... Reception circuit 33 ... Identification circuit 34 ... Switching circuit 35 ... Limiter circuit 36 ... A / D converter 37 ... Storage circuit 40 ... Drive mechanism 40A ... X-axis drive mechanism
40B ... Y-axis drive mechanism 41 ... Plate spring 42 ... Winding shaft 43 ... Y-axis actuator 44 ... X-axis guide 45 ... X-axis actuator 46 ... Rack 47 ... Pinion 48 ... Worm 49 ... Gear 50 ... Battery built-in device 50A ... No. 1 Battery built-in equipment
50B ... Second battery built-in device
50C ... Third battery built-in device 51 ... Power receiving coil 52 ... Battery 53 ... Capacitor 54 ... Parallel resonant circuit 55 ... Diode 56 ... Smoothing capacitor 57 ... Rectifier circuit 58 ... Charge control circuit 63 ... Voltage detection circuit 64 ... Power consumption detection circuit 65 ... Detection circuit 70 ... Charging stand 80 ... Charging stand 84 ... Position detection controller 93 ... Identification circuit 94 ... Switching circuit 94A ... X-axis switching circuit
94B ... Y-axis switching circuit 95 ... Input switching circuit 96 ... Reception switching circuit 97 ... Memory circuit

Claims (12)

A charging base for a battery built-in device (50) including a power receiving coil (51) to be electromagnetically coupled and a battery (52) charged with power induced by the power receiving coil (51),
A plurality of power transmission coils (11) connected to the AC power source (12) and inducing electromotive force in the power reception coil (51), and a plurality of power transmission coils (11) are built in, and a plurality of battery built-in devices ( 50) and a case (20) having an upper surface plate (21) having an area on which the upper surface plate (21) can be placed, and built in the case (20), each power transmission coil (11) is arranged along the inner surface of the upper surface plate (21). A moving mechanism (13) that moves independently, and a position of each battery built-in device (50) that is placed on the top plate (21) and controls the moving mechanism (13) to control each power transmission coil (11) And a position detection controller (14), (84) for making the power receiving coil (51) of each battery-equipped device (50) approach,
When a plurality of battery built-in devices (50) are placed on the top plate (21) of the case (20), the position of each battery built-in device (50) is detected by the position detection controllers (14), (84). The position detection controllers (14), (84) control the moving mechanism (13), and each moving coil (11) is moved along the top plate (21) by the moving mechanism (13). The charging base is made to approach the power receiving coil (51) of the battery built-in device (50). The moving mechanism (13) includes a plurality of sets of driving mechanisms (40) capable of independently moving the power transmission coils (11) along the inner surface of the upper surface plate (21). ) Includes a Y-axis drive mechanism (40B) and an X-axis drive mechanism (40A) for moving the power transmission coil (11) in directions crossing each other,
The Y-axis drive mechanism (40B) includes a leaf spring (41) formed by connecting the power transmission coil (11) to the tip, a winding shaft (42) for winding the leaf spring (41), and a winding shaft ( 42) is rotated forward to wind the leaf spring (41) around the take-up shaft (42), and reversely rotated to unwind the leaf spring (41) from the take-up shaft (42) to place the power transmission coil (11) into the leaf spring. A Y-axis actuator (43) for moving in the Y-axis direction which is the longitudinal direction of (41),
The X-axis drive mechanism (40A) moves the winding shaft (42) along the X-axis guide (44) and the X-axis guide (44) that moves the winding shaft (42) in the X-axis direction. X axis actuator (45)
The position detection controllers (14), (84) detect the position of each battery built-in device (50), and the Y-axis actuator (43) and X-axis actuator provided in each drive mechanism (40) The charging stand according to claim 1, wherein each of the power transmission coils (11) is controlled to be close to the power reception coil (51) of each battery built-in device (50) by controlling (45).   The charging stand according to claim 2, wherein the case (20) is provided with a horizontal guide (22) for moving the power transmission coil (11) in a horizontal direction while restricting the vertical movement of the power transmission coil (11).   The case is provided with a guide plate (23) at a position facing the upper surface plate (21), and the power transmission coil (11) is vertically moved between the guide plate (23) and the upper surface plate (21). The horizontal guide (22) is provided with a moving space (24) that moves in the horizontal direction by restricting the movement of the horizontal coil, and the horizontal guide (22) moves the power transmission coil (11) in the horizontal direction in the moving space (24). The charging stand according to claim 3, which is configured as described above.   The charging stand according to claim 2, wherein the leaf spring (41) is a ribbon-like thin plate that curves in a arch shape in a cross-sectional shape that intersects the longitudinal direction in an extruded state that is fed from the winding shaft (42).   The charging stand according to claim 1, wherein the Y-axis actuator (43) and the X-axis actuator (45) are stepping motors.   The X-axis drive mechanism (40A) is fixed to the take-up shaft (42), and the rack (46) meshes with the rack (46) to move the rack (46) along the X-axis guide (44). The charging device according to claim 2, further comprising a pinion (47) for rotating the winding shaft (42) in the X-axis direction by rotating the pinion (47) by the X-axis actuator (45). Stand.   A carriage (26) connected to the X-axis guide (44) so as to be movable along the X-axis guide (44) is provided. The carriage (26) is connected to the rack (46), and The take-up shaft (42) is rotatably connected, and a carriage (26) connecting the take-up shaft (42) via the rack (46) is provided along the X-axis guide (44). The charging stand according to claim 2, wherein the charging stand is moved.   The X-axis guide (44) is rotatably connected to the case (20), and the winding shaft (42) is connected to the X-axis guide (44) so as not to rotate but to move in the axial direction. The Y-axis actuator (43) is connected to the X-axis guide (44), and the Y-axis actuator (43) rotates the X-axis guide (44) to rotate the winding shaft (42). The charging stand as set forth in claim 8.   A plurality of pinions (47) are arranged at predetermined intervals in the moving direction of the rack (46), and each pinion (47) is rotated by the X-axis actuator (45) to move the rack (46) in the X-axis direction. The charging stand according to claim 7, wherein the charging stand is configured to be made.   The position detection controllers (14), (84) detect the position of the power receiving coil (51) of each battery built-in device (50) to bring the power transmitting coil (11) closer to the power receiving coil (51). Or the charging stand described in 2. The position detection controller (84) is a plurality of position detection coils (30) fixed to the top plate (21), a pulse power supply (31) for supplying a pulse signal to the position detection coil (30), A receiving circuit (32) that receives an echo signal excited from a pulse signal supplied from the pulse power source (31) to the position detection coil (30) and output from the power reception coil (51) to the position detection coil (30); And an identification circuit (93) for determining the position of the power reception coil (51) from the echo signal received by the reception circuit (32), and the position detection coil (30) further includes a power reception coil (51). A plurality of X-axis detection coils (30A) for detecting positions in the X-axis direction, and a plurality of Y-axis detection coils (30B) for detecting positions in the Y-axis direction,
In a state where the pulse power supply (31) supplies a pulse signal to any one of the position detection coils (30), an echo signal excited by the pulse signal and output from the power receiving coil (51) is converted into the X-axis detection coil. The charging stand according to claim 11, wherein the position of the power receiving coil (51) is determined by receiving both of the power receiving coil (30A) and the Y-axis detection coil (30B).

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