JP2011259534A - Battery-integrated apparatus and charging stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer power from a power supply coil provided in a charging stand to an induction coil provided in a battery-integrated apparatus.SOLUTION: A battery-integrated apparatus and a charging stand are composed of a charging stand 10 having a power supply coil 11 connected to an AC power source 12; and a battery-integrated apparatus 50 including an induction coil 51, and a built-in battery 52, which is provided in the battery-integrated apparatus 50, is charged by power transfer from the power supply coil 11 to the induction coil 51. The power supply coil 11 comprises an inner coil 11A, which is a planar coil; and an outer coil 11B, which is a planar coil, arranged at the outside of the inner coil 11A on the same plane. The AC power source 12 of the charging stand 10 has a switching circuit 64 for switching between an inner coil excitation state, supplying AC power to the inner coil 11A and an inner-and-outer coil excitation state, supplying AC power to the inner coil 11A and the outer coil 11B as well. The AC power source 12 transfers power to the induction coil 51 provided in the battery-integrated apparatus 50 by switching between the inner coil excitation state and the inner-and-outer coil excitation state.

Description

  The present invention relates to a battery built-in device such as a battery pack or a mobile phone, and a charging stand for charging the built-in battery of the battery built-in device by transferring electric power to the battery built-in device by electromagnetic induction.

  A charging stand has been developed that carries power from the power supply coil to the induction coil by the action of electromagnetic induction and charges the battery built in a battery built-in device such as a pack battery or a notebook computer. (See Patent Document 1)

  Patent Document 1 describes a structure in which a power supply coil that is excited by an AC power supply is built in a charging stand, and an induction coil that is electromagnetically coupled to the power supply coil is built in a battery built-in device such as a pack battery or a notebook computer. . The power supply coil of the charging stand and the induction coil of the battery built-in device are wound around a ferrite core disposed so as to face each other. The ferrite cores of the power supply coil and the induction coil are magnetically coupled to form a transformer, and power is conveyed from the power supply coil to the induction coil by magnetic induction.

JP 2005-110409 A

  The above charging stand adjusts the electric power carried from the power supply coil to the induction coil depending on the type of the battery built-in device to be mounted. To adjust the power, the tap of the coil wound around the ferrite core is switched. This structure can adjust the electric power carried and can be sent to the battery built-in device. However, there is a drawback that power cannot always be efficiently transferred to the induction coil of the battery built-in device.

  The present invention has been developed for the purpose of solving the above-described drawbacks. An important object of the present invention is to provide a battery built-in device and a charging stand that can efficiently transfer power from the power supply coil of the charging stand to the induction coil of the battery built-in device.

Means for Solving the Problems and Effects of the Invention

  The battery built-in device and the charging stand of the present invention include a charging stand 10 in which AC power supplies 12 and 72 are connected to a power supply coil 11, and an induction coil 51 that is set on the charging stand 10 and electromagnetically coupled to the power supply coil 11. The built-in battery device 50 is built in, and the built-in battery 52 of the battery built-in device 50 is charged with electric power transferred from the power supply coil 11 to the induction coil 51. The power supply coil 11 includes an inner coil 11A that is a planar coil, and an outer coil 11B that is a planar coil that is positioned outside the inner coil 11A and arranged on the same plane as the inner coil 11A. The AC power supplies 12 and 72 of the charging base 10 supply AC power to the inner coil 11A and supply AC power to both the inner coil 11A and the outer coil 11B. Switching circuits 64 and 74 for switching between the supplied and external coil excitation states are provided. The battery built-in device 50 is switched between the inner coil excitation state and the inner and outer coil excitation states by the battery built-in device 50 set on the charging stand 10. Power is conveyed to the induction coil 51.

  The battery built-in device and the charging stand described above are characterized in that power can be efficiently transferred from the power supply coil to the induction coil. That is, the induction coil of the battery built-in device set on the charging base supplies the power coil of the charging base to the inner coil excitation state in which power is supplied only to the inner coil, and AC power is supplied to both the inner coil and the outer coil. This is because the power is transferred from the power supply coil to the induction coil by switching to the inner / outer coil excitation state. In the inner coil excitation state, the outer diameter of the power coil that is excited relative to the inner and outer coil excitation states is small, so that the power can be efficiently transferred by being electromagnetically coupled to a small induction coil. Since the outer diameter of the coil becomes large, power can be efficiently transferred to a large induction coil. For this reason, there exists the characteristic which can carry out electric power efficiently in both the battery built-in apparatus which incorporates a large induction coil, and the battery built-in apparatus which incorporates a small exciting coil. Improving the efficiency of power transfer not only saves energy, but also reduces the wasteful heat generated by the built-in battery and effectively prevents the harmful effects caused by the heat that heats the built-in battery and other electronic components. is there. In particular, since the battery built-in device accommodates the battery and various parts in a limited volume, it is difficult to efficiently dissipate the internal heat generation, and it is extremely important how the heat generation can be reduced.

  In the battery built-in device and the charging stand according to the present invention, the power coil is a thin flat coil, the power coil is both a flat coil for the outer coil and the inner coil, and the outer coil and the inner coil are arranged on the same plane. Therefore, the power coil can be thinned and stored in a narrow space, and the power can be efficiently transferred from the charging stand to a plurality of battery built-in devices.

In the battery built-in device and the charging stand according to the present invention, the inner coil 11A and the outer coil 11B are α-wound planar coils, the inner coil 11A has a lead wire 11a arranged on the inner periphery of the planar coil, and the outer coil 11B is planar. Lead wires 11b can be arranged on the outer periphery of the coil.
In the above battery built-in device and charging stand, the inner coil and the outer coil of the power coil are α-coiled flat coils, so that the thickness of the power coil due to the outgoing line is small and the entire power coil is made thin. The inner coil can be arranged inside the outer coil. In addition, it is possible to simplify the wiring of the outgoing line while arranging the inner coil and the outer coil in close contact with each other without providing the outgoing line at the boundary between the outer coil and the inner coil.

In the battery built-in device and the charging stand of the present invention, the AC power supplies 12 and 72 of the charging stand 10 can switch between the inner coil excited state and the inner / outer coil excited state depending on the outer diameter of the induction coil 51 of the battery built-in device 50.
The battery built-in device and the charging stand control the outer diameter of the region that excites the power supply coil by the outer diameter of the induction coil, so that power can be efficiently transferred to the large outer diameter induction coil and the small outer diameter induction coil. There are features.

The battery built-in device and the charging stand according to the present invention include information transmission circuits 66 and 67 for transmitting information between the battery built-in device 50 and the charging stand 10, and the charging stand 10 from the battery built-in device 50 by the information transmission circuits 66 and 67. The outer diameter information of the induction coil 51 can be transmitted to the AC power supply 12 and 72 of the charging base 10, and the inner / outer coil excitation state and the inner / outer coil excitation state can be switched by the transmitted outer diameter information.
The charging base described above switches the area to excite the power coil based on the information transmitted from the battery built-in device. Therefore, the area to excite the power coil is efficiently set as the optimum area for the induction coil built in the battery built-in device. There is a feature that can carry power.

The battery built-in device and the charging stand according to the present invention include an efficiency detection circuit 86 for detecting the power transmission efficiency of the charging stand 10 carrying power from the power supply coil 11 to the induction coil 51, and the AC power supplies 12 and 72 are the efficiency detection circuit 86. It is possible to switch between the inner coil excitation state and the inner / outer coil excitation state so as to maximize the detected transmission efficiency.
Since the charging base described above switches the region for exciting the power supply coil so that the efficiency of power transfer is improved, there is a feature that power can always be efficiently transferred to a battery built-in device having a different induction coil.

In the battery built-in device and the charging stand according to the present invention, the inner coil 11A and the outer coil 11B can be mounted on the surface of the circuit board 18, and the outgoing line 11a of the inner coil 11A can be connected to the conductive pattern 19 of the circuit board 18. .
The above charging stand is characterized in that the power supply coil is mounted on the circuit board, and the total thickness of the power supply coil and the circuit board can be reduced. In particular, there is a feature that the total thickness of the power supply coil and the circuit board can be reduced while pulling out the lead wire of the inner coil outside the power supply coil. This is because the lead wire from the inner coil drawn out to the outside of the outer coil is formed by a thin conductive portion of the circuit board, so that it is not necessary to stack the same conductive wire as the inner coil on the outer coil.

The battery built-in apparatus and the charging stand of the present invention include a power adjustment circuit 65 that changes the power supplied from the AC power supplies 12 and 72 to the power supply coil 11, and the power adjustment circuit 65 supplies the supplied power in the excited state of the inner and outer coils. The power supplied in the inner coil excitation state can be made larger.
The above charging stand makes the total power supplied to the inner coil and the outer coil in the excited state of the inner and outer coils larger than the power supplied to the inner coil in the excited state of the inner coil. High-power efficient power transfer and small induction coil-equipped batteries have the feature of being able to transfer power efficiently with low power.

The battery built-in device and the charging stand according to the present invention include information transmission circuits 66 and 67 for transmitting information between the battery built-in device 50 and the charging stand 10, and the charging stand 10 from the battery built-in device 50 by the information transmission circuits 66 and 67. In addition, the AC power supplies 12 and 72 of the charging base 10 include a power adjustment circuit 65 that changes the power supplied to the power supply coil 11, and the power adjustment circuit 65 transmits the necessary power information. The power supplied to the power supply coil 11 can be changed based on the above.
The above charging base changes the power supplied to the power coil based on the required power information transmitted from the battery built-in device, so it is ideal to supply the optimum power for charging the internal battery of the battery built-in device. The built-in battery can be charged.

In the battery built-in device and the charging stand according to the present invention, the induction coil 51 and the power supply coil 11 are connected to each other in a state where both the power supply coil 11 and the induction coil 51 are planar coils and the battery built-in device 50 is set on the charging stand 10. The power can be transferred from the power supply coil 11 to the induction coil 51 by being disposed at a position that is close and opposed.
The battery built-in device and the charging stand described above have both the power coil and the induction coil as planar coils, so that the power can be efficiently transferred from the charging stand to the battery built-in device while making the charging stand and the battery built-in device thin. .

In the battery built-in device and the charging stand according to the present invention, the power coil 11 and the induction coil 51 can be air-core planar coils.
Furthermore, in the above battery built-in device and charging stand, both the power supply coil and the induction coil are air-core planar coils, so the power supply coil and the induction coil are made particularly thin and power is efficiently transferred from the power supply coil to the induction coil. There are features that can be done.

It is a perspective view of the battery built-in apparatus and charging stand concerning one Example of this invention. It is a schematic perspective view which shows the internal structure of the charging stand shown in FIG. It is a horizontal sectional view which shows the internal structure of the charging stand shown in FIG. It is a vertical longitudinal cross-sectional view of the charging stand shown in FIG. It is a vertical cross-sectional view of the charging stand shown in FIG. It is a circuit diagram which shows an example of the position detection controller of a charging stand. It is a block diagram of the battery built-in apparatus and charging stand concerning one Example of this invention. It is a perspective view which shows an example of a power supply coil. It is a disassembled perspective view of the power supply coil shown in FIG. It is a circuit diagram which shows the connection state of a power coil and AC power supply. It is a block diagram of the battery built-in apparatus and charging stand concerning the other Example of this invention. It is a circuit diagram which shows another example of alternating current power supply. It is a figure which shows an example of the echo signal output from the induction coil excited with the position detection signal. It is a figure which shows the change of the oscillation frequency with respect to the relative position shift of a power supply coil and an induction coil. It is a circuit diagram which shows another example of the position detection controller of a charging stand. It is a figure which shows the level of the echo signal induced | guided | derived to the position detection coil of the position detection controller shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies the battery built-in device and the charging stand for embodying the technical idea of the present invention, and the present invention does not specify the battery built-in device and the charging stand as follows. . Further, this specification does not limit the members shown in the claims to the members of the embodiments.

  1 to 7 show a schematic configuration diagram and a principle diagram of the charging stand 10. As shown in FIGS. 1, 2, and 7, the charging stand 10 places the battery built-in device 50 on the charging stand 10, and carries the power of the built-in battery 52 of the battery built-in device 50 by magnetic induction. Charge. The battery built-in device 50 includes an induction coil 51 that is electromagnetically coupled to the power supply coil 11. A built-in battery 52 that is charged with electric power induced in the induction coil 51 is incorporated. Here, the battery built-in device 50 may be an electronic device such as a mobile phone or an IC player, or may be a pack battery.

  FIG. 7 is a circuit diagram of the battery built-in device 50. The battery built-in device 50 includes a rectifier circuit 53 that rectifies the alternating current induced by the induction coil 51, a charging circuit 54 that charges the built-in battery 52 of the battery built-in device 50 using the output of the rectifier circuit 53, and the induction coil 51. A short circuit 56 that short-circuits both ends and a control circuit 57 that detects charging abnormality and controls the short circuit 56 to be on are provided.

  The rectifier circuit 53 rectifies the alternating current induced by the induction coil 51 and outputs the rectified circuit to the charging circuit 54. The battery built-in device 50 shown in the figure has a series capacitor 55 connected between the induction coil 51 and the rectifier circuit 53, and the alternating current induced in the induction coil 51 is input to the rectifier circuit 53 via the series capacitor 55. ing. The series capacitor 55 constitutes a series resonance circuit with the induction coil 51 and efficiently inputs the alternating current induced in the induction coil 51 to the rectifier circuit 53. Accordingly, the capacitance of the series capacitor 55 is set to be close to the frequency of the induced alternating current by the inductance of the induction coil 51. Further, in the battery built-in device 50 in the figure, an electrolytic capacitor 58 for smoothing the pulsating flow output from the rectifier circuit 53 is connected to the output side of the rectifier circuit 53.

  The short circuit 56 shorts both ends of the induction coil 51 to cut off power supply from the induction coil 51 to the rectifier circuit 53. The short circuit 56 in FIG. 7 shorts both ends of the induction coil 51 via a series capacitor 55. This structure has an advantage that heat generation of the induction coil 51 can be effectively prevented in a short circuit state in which the short circuit 56 is turned on. The short circuit 56 shown in the figure is a short circuit switch 56 </ b> A that shorts the output side of the induction coil 51. The shorting switch 56A shown in the drawing is an FET. However, a semiconductor switching element such as a transistor or a relay can be used for this short-circuit switch.

  The short circuit switch 56A, which is the short circuit 56, is controlled to be turned on and off by a control circuit 57 that detects a charging abnormality. The control circuit 57 detects charging abnormality and controls the short-circuit switch 56A to be turned on / off. The control circuit 57 turns off the FET of the short-circuit switch 56A in a state where no charging abnormality is detected, and turns on the FET of the short-circuit switch 56A when detecting the charging abnormality. The short-circuit switch 56 </ b> A in the on state shorts the output side of the induction coil 51 via the series capacitor 55, and cuts off power supply from the induction coil 51 to the rectifier circuit 53.

  The abnormal charging state is, for example, a state in which power transfer from the charging stand 10 cannot be stopped even after the built-in battery 52 of the battery built-in device 50 is overcharged and disconnected by the protection circuit, or the battery built-in device 50 is electromagnetically cooked. This is a state in which abnormal power is induced in the induction coil 51 by being placed on a vessel or the like. The state in which the charging of the built-in battery 52 is stopped and the power transfer from the charging stand 10 cannot be stopped is, for example, despite the fact that the charging stop signal is transmitted from the battery built-in device 50 to the charging stand 10. Occurs in a state where the supply of AC power to the power supply coil 11 cannot be stopped.

  When charging of the built-in battery 52 is stopped and the charging stand 10 continues to fail and power is transferred, the protection circuit on the battery side is activated and disconnected, and the induction coil 51 enters an unloaded state to induce voltage. Becomes abnormally high. In addition, when the battery built-in device 50 is placed on an electromagnetic cooker or the like, the power transferred to the induction coil 51 becomes extremely large, and the induction voltage of the induction coil 51 becomes higher than a specified value. This state causes, for example, destruction by applying a voltage higher than the withstand voltage to the rectifying element of the rectifying circuit. In particular, in a circuit configuration in which the rectifier circuit is an FET synchronous rectifier circuit, the FET is destroyed by a high voltage.

  As shown in FIGS. 1 to 7, the charging stand 10 includes a power coil 11 that is connected to an AC power source 12 and induces an electromotive force in the induction coil 51, and the power coil 11, and has a battery on the upper surface. A case 20 having an upper surface plate 21 on which the device 50 is placed, a moving mechanism 13 that is built in the case 20 and moves the power supply coil 11 along the inner surface of the upper surface plate 21, and a battery built-in device 50 that is placed on the upper surface plate 21. And a position detection controller 14 that controls the moving mechanism 13 to bring the power supply coil 11 closer to the induction coil 51 of the battery built-in device 50. The charging stand 10 includes a power coil 11, an AC power supply 12, a moving mechanism 13, and a position detection controller 14 in a case 20.

The charging stand 10 charges the built-in battery 52 of the battery built-in device 50 by the following operation.
(1) When the battery built-in device 50 is placed on the upper surface plate 21 of the case 20, the position detection controller 14 detects the position of the battery built-in device 50.
(2) The position detection controller 14 that has detected the position of the battery built-in device 50 controls the moving mechanism 13 to move the power supply coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the induction coil 51.
(3) The power supply coil 11 approaching the induction coil 51 is electromagnetically coupled to the induction coil 51 and carries AC power to the induction coil 51.
(4) The battery built-in device 50 rectifies the AC power of the induction coil 51 and converts it into direct current, and charges the built-in battery 52 with this direct current.

  The charging stand 10 that charges the built-in battery 52 of the battery built-in device 50 by the above operation has the power coil 11 connected to the AC power supply 12 disposed in the case 20. The power supply coil 11 is disposed below the upper surface plate 21 of the case 20 and moves along the upper surface plate 21. The efficiency of power transfer from the power supply coil 11 to the induction coil 51 can be improved by narrowing the interval between the power supply coil 11 and the induction coil 51. Preferably, the distance between the power supply coil 11 and the induction coil 51 is set to 7 mm or less with the power supply coil 11 approaching the induction coil 51. Therefore, the power supply coil 11 is disposed below the top plate 21 and as close to the top plate 21 as possible. Since the power supply coil 11 moves so as to approach the induction coil 51 of the battery built-in device 50 placed on the upper surface plate 21, the power supply 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 supply 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 of FIGS. 1 and 2 is disposed horizontally with the entire top plate 21 as a flat surface. The upper surface plate 21 has such a size that various battery-equipped devices 50 having different sizes and outer shapes can be placed thereon, for example, a quadrangle having one side of 5 cm to 30 cm. However, the top plate may be circular with a diameter of 5 to 30 cm. The charging stand 10 of FIGS. 1 and 2 is built in such a manner that the upper plate 21 is enlarged, that is, a size capable of mounting a plurality of battery built-in devices 50 at the same time. The built-in battery 52 can be charged in order. 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.

  The power supply coil 11 is a planar coil wound in a spiral shape on a plane parallel to the upper surface plate 21, and radiates an alternating magnetic flux above the upper surface plate 21. The power supply coil 11 radiates an alternating magnetic flux orthogonal to the upper surface plate 21 above the upper surface plate 21. The power supply coil 11 is supplied with AC power from the AC power supply 12 and radiates AC magnetic flux above the top plate 21.

  The power supply coil 11 is shown in FIGS. In the power supply coil 11, an outer coil 11B is disposed outside the inner coil 11A. The inner coil 11A and the outer coil 11B are both planar coils, the inner coil 11A is disposed inside the outer coil 11B, and the outer coil 11B and the inner coil 11A are disposed on the same plane. The inner diameter of the outer coil 11B is substantially equal to the outer diameter of the inner coil 11A so that there is no gap between the outer coil 11B and the inner coil 11A. The power supply coil 11 without a gap between the inner coil 11A and the outer coil 11B can efficiently carry power to the induction coil 51 of the battery built-in device 50 in a state in which power is supplied to both the inner coil 11A and the outer coil 11B. .

  The inner coil 11A and the outer coil 11B are α-turned planar coils. The α-wound outer coil 11B draws the lead wire 11b to the outer periphery, and the α-wound inner coil 11A pulls the lead wire 11a to the inner periphery. The α-coiled planar coil has spiral coils stacked in an even number of stages and connected in series. The α-winding outer coil 11B is a coil in which the spiral coil disposed in the even-numbered stages is spirally wound from the outer periphery to the inside, and the spiral coil disposed in the odd-numbered stages is spirally wound from the inside to the outside. The lead wire 11b is provided on the outer peripheral edge. The α-wound inner coil 11A is formed by winding a spiral coil arranged in even-numbered stages spirally from the inner periphery to the outside and winding a spiral coil arranged in odd-numbered stages spirally from the outer periphery to the inside. The line 11a is drawn inward.

  The power supply coil 11 in which both the inner coil 11A and the outer coil 11B are α-coiled planar coils and the inner coil 11A is arranged inside the outer coil 11B has a structure in which both the inner coil 11A and the outer coil 11B are wound in multiple stages. Thus, the coil area excited by the AC power source can be changed to a large outer diameter and a small outer diameter while the inductance is increased by a thick coil while the outer diameter is specified. Further, without providing a lead wire at the boundary between the outer coil 11B and the inner coil 11A, the inner coil 11A and the outer coil 11B can be brought into close contact with each other to easily wire the lead wires 11a and 11b. However, the present invention does not limit the power supply coil to the above structure. For example, a spiral coil is arranged in one stage, a tap is provided in the middle of the coil, the inside of the tap is the inner coil, and the outer side of the tap is It can also be an outer coil.

  8 and 9 has an inner coil 11A and an outer coil 11B bonded and fixed to the surface of the circuit board 18. The circuit board 18 is a thin flexible board, and a conductive pattern 19 is provided on the surface. The lead wire 11a of the inner coil 11A is soldered to the conductive pattern 19 provided in the center hole of the inner coil 11A, and the lead wire 11b of the outer coil 11B is a conductive pattern provided on the outer periphery of the outer coil 11B. It is connected to 19 by soldering. The circuit board 18 connects the inner coil 11 </ b> A and the outer coil 11 </ b> B in series with the conductive pattern 19 so that the winding direction is the same. Further, the circuit board 18 is provided with an intermediate connection point 11X between the inner coil 11A and the outer coil 11B, and three lines of conductive patterns 19 that connect one end of the outer coil 11B and the inner coil 11A to the outside.

  FIG. 10 shows a circuit diagram in which the power supply coil 11 is connected to the AC power supply 12 through three lines of conductive patterns 19. The AC power supply 12 in this figure includes a switching power supply 62 that converts an input commercial power supply 61 into a DC voltage, and a switching element 63 that converts a DC output from the switching power supply 62 into an AC and supplies it to the power supply coil 11. And a switching circuit 64 for controlling the switching element 63. Furthermore, the AC power supply 12 shown in the figure includes a power adjustment circuit 65 that changes the power supplied to the power supply coil 11.

  The switching power supply 62 converts alternating current input from the commercial power supply 61 into a predetermined direct current voltage and outputs it. The switching circuit 64 controls the switching element 63 to supply AC power to the inner coil 11A and to supply AC power to both the inner coil 11A and the outer coil 11B. Switch to the internal / external coil excitation state to supply power. The switching circuit 64 switches between the inner coil excitation state and the inner / outer coil excitation state by the battery built-in device 50 set on the charging stand 10, and carries power to the induction coil 51 of the battery built-in device 50.

  The AC power supply 12 in FIG. 10 has a predetermined one of the first switching element 63A connected to the intermediate connection point 11X of the power supply coil 11 and the second switching element 63B connected to one end of the outer coil 11B. The cycle is switched on and off, while the other is held off, and the inner coil excitation state and the inner and outer coil excitation states are switched. When the first switching element 63A is switched on and off, and the second switching element 63B is held in the off state, the inner coil is excited, and the second switching element 63B is switched on and off. When the switching element 63A is held in the off state, the inner and outer coils are excited. The switching element 63 is switched on and off at a cycle of 20 kHz to several MHz, for example, and supplies high frequency power to the power supply coil 11.

  The switching circuit 64 determines which of the first switching element 63 </ b> A and the second switching element 63 </ b> B is switched on / off based on the size of the induction coil 51 of the battery built-in device 50 set on the charging stand 10. The size of the induction coil 51 of the battery built-in device 50 is detected by information transmitted from the battery built-in device 50 to the charging base 10, or from the power supply coil 11 to the induction coil 51 in the inner / outer coil excited state and the inner / outer coil excited state. It is determined by detecting the power transmission efficiency of power transfer.

  As shown in FIGS. 7 and 10, the system for determining the size of the induction coil 51 based on the information transmitted from the battery built-in device 50 includes the outer diameter information of the induction coil 51 on the battery built-in device 50 and the charging stand 10. Information transmission circuits 66 and 67 for transmission are provided. This system transmits the outer diameter information of the induction coil 51 from the information transmission circuit 66 of the battery built-in device 50 to the information transmission circuit 67 of the charging table 10 at the timing when the battery built-in device 50 is set on the charging stand 10. The AC power supply 12 of the charging stand 10 determines the outer diameter of the induction coil 51 from the transmitted outer diameter information, and switches between the inner coil excitation state and the inner and outer coil excitation states. In the state where the outer diameter information specifying the small induction coil 51A is transmitted to the charging base 10, the AC power source 12 generates an AC magnetic field in a small area as an inner coil excitation state and efficiently carries power to the small induction coil 51A. In the state where the outer diameter information for specifying the large induction coil 51B is transmitted, an AC magnetic field is generated in a wide area as an inner and outer coil excitation state, and power is efficiently conveyed to the large induction coil 51B.

  As shown in FIG. 11, the system for determining the size of the induction coil 51 based on the transmission efficiency is provided with an efficiency detection circuit 86 for detecting the transmission efficiency for power transfer from the power supply coil 11 to the induction coil 51. The power source 12 switches between the inner coil excitation state and the inner / outer coil excitation state so as to maximize the transmission efficiency detected by the efficiency detection circuit 86. The induction coil 51 and the power supply coil 11 can efficiently carry electric power with the same size. In particular, the structure in which the planar coil induction coil 51 and the planar coil power supply coil 11 are arranged so as to face each other and power is transferred from the power supply coil 11 to the induction coil 51 is the same. Power can be efficiently conveyed as a diameter.

  For example, the outer diameter of the inner coil 11A is 3 cm, the outer diameter of the outer coil 11B is 4 cm, and the power can be efficiently transferred to the battery built-in device 50 having the 3 cm or 4 cm induction coil 51 built therein. For example, in a state where the battery built-in device 50A including the induction coil 50A having an outer diameter of 3 cm is set on the charging stand 10, the inner coil 11A having an outer diameter of 3 cm is excited, that is, the inner coil is excited. As a state, power can be efficiently conveyed to the induction coil 51. When the battery built-in device 50B including the induction coil 51B having an outer diameter of 4 cm is set on the charging base 10, both the outer coil 11B and the inner coil 11A having an outer diameter of 4 cm are excited. In other words, power can be efficiently transferred to the induction coil 51B in the excited state of the inner and outer coils. However, the power supply coil and the induction coil do not necessarily have to have the same outer diameter to carry power, and can be carried with an approximate outer diameter. Therefore, in order to carry electric power to the battery built-in device 50B with the large induction coil 51B and the battery built-in device 50A with the small induction coil 51A, the large induction as the power supply coil 11 whose outer diameter can be changed between the inner coil 11A and the outer coil 11B. The coil 51B is a large power supply coil 11, and the small induction coil 51A can be efficiently conveyed by the small power supply coil 11. The charging stand 10 places the power supply coil 11 in the inner coil excitation state and the inner / outer coil excitation state so that the outer diameter is close to the size of the induction coil 51 built in the battery built-in device 50 set in the charging stand 10. Power is transferred efficiently by switching.

  The power adjustment circuit 65 changes the power supplied to the power supply coil 11 by changing the power supply voltage of the switching power supply 62 or changing the on / off duty of the switching element 63. The power adjustment circuit 65 increases the power supplied to the power supply coil 11 with the power supply voltage of the switching power supply 62 as a high voltage, or increases the duty of the switching element 63, that is, sets the ratio of the on time to the off time. The power supplied to the power coil 11 is increased by increasing the power. In addition, the power adjustment circuit 65 reduces the power supplied to the power supply coil 11 by setting the power supply voltage of the switching power supply 62 to a low voltage, or reduces the duty of the switching element 63, that is, the ratio of the on time to the off time. To reduce the power supplied to the power supply coil 11. The power adjustment circuit 65 changes the power supplied to the power supply coil 11 so that the supply power in the inner and outer coil excitation states is larger than the supply power in the inner coil excitation state. In the inner coil excitation state, the AC power supply 12 reduces the power supplied to the inner coil 11A by reducing the output voltage of the switching power supply 62 or reducing the ON / OFF duty of the switching element 63 to reduce the power supplied to the inner coil 11A. In the excited state, the output voltage of the switching power supply 62 is set to a high voltage, or the duty of ON / OFF of the switching element 63 is increased to increase the power supplied to both the inner coil 11A and the outer coil 11B.

  Further, the AC power supply 72 in FIG. 12 connects both ends of the power supply coil 11 and the intermediate connection point 11X to both the positive side and the negative side of the switching power supply 62 via the pair switching element 73. The pair switching element 73 is controlled by a switching circuit 74. The switching circuit 74 outputs a switching signal that is an AC signal having a cycle for switching the pair switching element 73 on and off, for example, a switching signal having a frequency of 20 KHz to several MHz, and a switching output from the oscillation circuit 75. An inverting circuit 76 that inverts the signal and outputs an inverted phase switching signal, and an inverted phase switching signal that is output from the inverting circuit 76 is either the second pair switching element 73B or the third pair switching element 73C. And a change-over switch 77 for switching to output. Furthermore, the AC power source 72 shown in the figure also includes a power adjustment circuit 65 that changes the power supplied to the power supply coil 11. The power adjustment circuit 65 changes the power supplied to the power supply coil 11 by changing the power supply voltage of the switching power supply 62. However, this power adjustment circuit can also change the power supplied to the power supply coil by changing the on / off duty of the switching signal output from the oscillation circuit.

  In the inner coil excitation state, the AC power source 72 inputs the switching signal of the reverse phase output from the inverting circuit 76 to the gate of the second pair switching element 73B as shown in FIG. The switch 77 is switched to the second pair switching element 73B side, and the first pair switching element 73A connected to one end of the inner coil 11A and the second pair switching element 73B connected to the intermediate connection point 11X. Is switched on and off at a predetermined cycle, and the third pair switching element 73C connected to one end of the outer coil 11B is held in the off state. The first pair switching element 73A and the second pair switching element 73B, which are switched on and off with respect to each other, are connected at the timing when the first pair switching element 73A connects one end of the inner coil 11A to the plus side. When the pair switching element 73B connects the intermediate connection point 11X to the minus side and the first pair switching element 73A connects one end of the inner coil 11A to the minus side, the second pair switching element 73B is in the middle. Connect the connection point 11X to the plus side. The first pair switching element 73A and the second pair switching element 73B are alternately switched and connected to the plus side and the minus side of the switching power supply 62 at a predetermined cycle to bring the inner coil 11A into an excited state. That is, the inner coil is excited. Further, the AC power supply 72 reduces the power supplied to the inner coil 11 </ b> A by the voltage adjustment circuit 65 controlling the output voltage of the switching power supply 62 to a low voltage in the inner coil excitation state.

  Further, when the above AC power source 72 is in the inner / outer coil excitation state, the selector switch 77 is switched to input the reverse phase switching signal output from the inverting circuit 76 to the third pair switching element 73C. In this state, the first pair switching element 73A connected to one end of the inner coil 11A and the third pair switching element 73C connected to one end of the outer coil 11B are switched on and off at a predetermined cycle. The second pair switching element 73B connected to the intermediate connection point 11X is held in the off state. The first pair switching element 73A and the third pair switching element 73C that are switched on and off with respect to each other are connected at the timing when the first pair switching element 73A connects one end of the inner coil 11A to the plus side. At the timing when the pair switching element 73C connects one end of the outer coil 11B to the minus side and the first pair switching element 73A connects one end of the inner coil 11A to the minus side, the third pair switching element 73C One end of the outer coil 11B is connected to the plus side. The first pair switching element 73A and the third pair switching element 73C are configured so that the power supply coil 11 connecting the inner coil 11A and the outer coil 11B in series is alternately set on the positive side and the negative side of the switching power supply 62. Are switched and connected to make both the inner coil 11A and the outer coil 11B excited. In other words, the inner and outer coils are excited. Further, the AC power supply 72 increases the power supplied to both the inner coil 11A and the outer coil 11B by the voltage adjustment circuit 65 controlling the output voltage of the switching power supply 62 to a high voltage in the excited state of the inner and outer coils.

  The first pair switching element 73A is switched on / off by a switching signal output from the oscillation circuit 75, and the second pair switching element 73B and the third pair switching element 73C are switching signals having an opposite phase to the switching signal. Since it is switched on and off, when the first pair switching element 73A connects one end of the coil to the plus side, the second pair switching element 73B and the third pair switching element 73C have the other end side of the coil on the minus side. In addition, when the first pair switching element 73A connects one end of the coil to the minus side, the second pair switching element 73B and the third pair switching element 73C have the other end side of the coil set to the plus side. They are connected and excited by alternating current by causing current to flow alternately through the power supply coil 11 in the opposite direction. The above AC power supply 72 always connects both ends of the coil to the positive side and the negative side of the switching power supply 62 to efficiently supply power to the power supply coil 11.

  The charging base 10 described above changes the power supplied from the AC power supplies 12 and 72 to the power supply coil 11 so that the supply power in the inner and outer coil excitation states is larger than the supply power in the inner coil excitation state. In a state where the battery built-in device 50B including the large induction coil 51B is set, the charging stand 10 increases the power supplied to the inner coil 11A and the outer coil 11B as an inner / outer coil excitation state, thereby increasing efficiency with high power. It can carry power well. Further, in a state where the battery built-in device 50A including the small induction coil 51A is set, the power supplied to the inner coil 11A can be reduced as the inner coil excitation state, and the power can be efficiently conveyed with low power. However, even a battery built-in device with a small induction coil may require a large amount of power depending on the capacity of the built-in battery (for example, a large-capacity built-in battery) and the state of charge (for example, during quick charge) On the other hand, even in a battery built-in device with a large induction coil, a small power may be preferable depending on the capacity of the built-in battery (for example, a small-capacity built-in battery) and the state of charge (for example, a state close to full charge). . Therefore, the charging stand of the present invention does not necessarily require the supply power in the inner and outer coil excitation states to be larger than the supply power in the inner coil excitation state, and the supply power in the inner and outer coil excitation states is reduced and the inner coil excitation state is reduced. It is also possible to increase the supply power at.

  The charging stand transmits necessary power information from the battery built-in device to be set to the charging stand, and the AC power supply can change the power supplied to the power supply coil based on the necessary power information. For example, as shown in FIG. 7 and FIG. 10, the battery built-in device 50 and the charging stand 10 including the information transmission circuits 66 and 67 for transmitting information are transmitted from the information transmission circuit 66 of the battery built-in device 50 to the charging stand 10. The necessary power information is transmitted to the circuit 67, and the power supplied to the power supply coil 11 by the AC power supply 12 of the charging base 10 can be adjusted by the power adjustment circuit 65 based on the transmitted necessary power information. The battery built-in device 50 calculates the optimum carrier power from the maximum capacity and remaining capacity of the built-in battery 52, the battery temperature, and the like, and transmits this information to the charger 10 as necessary power information. The battery built-in device 50 transmits the outer diameter information and necessary power information of the induction coil 51 to the charging stand 10 at the timing when the battery built-in device 50 is set on the charging stand 10, and the built-in battery 52 of the battery built-in device 50 is charged. Also at the timing, the required power information can be transmitted to the charging stand 10. When the necessary power information is transmitted from the battery built-in device 50, the charging stand 10 adjusts the power supplied to the power supply coil 11 by the power adjustment circuit 65 so that the optimum carrier power is obtained. That is, the charging stand 10 switches between the inner coil excitation state and the inner / outer coil excitation state based on the outer diameter information of the induction coil 51 of the battery built-in device 50 to be set, and also according to the necessary power information transmitted from the battery built-in device 50. The power supplied from the AC power supply 12 to the power supply coil 11 is adjusted. Thereby, even when the battery built-in device 50A including the small induction coil 51A is set and the inner coil is excited, the power supplied to the inner coil 11A can be increased, and the power can be efficiently conveyed with high power. Even when the battery built-in device 50B including the large induction coil 51B is set and the inner and outer coils are excited, the power supplied to the inner coil 11A and the outer coil 11B is reduced to efficiently carry power with low power. can do.

  3 moves the power supply coil 11 so as to approach the induction coil 51, the power supply coil 11 is connected to the AC power supply 12 via a flexible lead wire 16. This is because the power supply coil 11 is moved so as to approach the induction coil 51 of the battery built-in device 50 placed on the upper surface plate 21.

  The power supply coil 11 is moved by the moving mechanism 13 so as to approach the induction coil 51. The moving mechanism 13 shown in FIGS. 2 to 5 moves the power supply coil 11 along the upper surface plate 21 in the X-axis direction and the Y-axis direction to approach the induction coil 51. The moving mechanism 13 shown in the drawing rotates the screw rod 23 by the servo motor 22 controlled by the position detection controller 14 to move the nut member 24 screwed into the screw rod 23, thereby moving the power supply coil 11 to the induction coil 51. To approach. The servo motor 22 includes an X-axis servo motor 22A that moves the power supply coil 11 in the X-axis direction, and a Y-axis servo motor 22B that moves the power coil 11 in the Y-axis direction. The screw rod 23 includes a pair of X-axis screw rods 23A that move the power supply coil 11 in the X-axis direction, and a Y-axis screw rod 23B that moves the power supply coil 11 in the Y-axis direction. The pair of X-axis screw rods 23A are arranged in parallel to each other, driven by the belt 25, and rotated together by the X-axis servomotor 22A. The nut member 24 includes a pair of X-axis nut members 24A screwed into the respective X-axis screw rods 23A, and a Y-axis nut member 24B screwed into the Y-axis screw rods 23B. The Y-axis screw rod 23B is coupled so that both ends thereof can be rotated to a pair of X-axis nut members 24A. The power coil 11 is connected to the Y-axis nut member 24B.

  Further, the moving mechanism 13 shown in the figure has a guide rod 26 disposed in parallel with the Y-axis screw rod 23B in order to move the power supply coil 11 in the Y-axis direction in a horizontal posture. Both ends of the guide rod 26 are connected to the pair of X-axis nut members 24A and move together with the pair of X-axis nut members 24A. The guide rod 26 penetrates the guide portion 27 connected to the power supply coil 11 so that the power supply coil 11 can be moved along the guide rod 26 in the Y-axis direction. In other words, the power supply coil 11 moves in the Y-axis direction in a horizontal posture through the Y-axis screw rod 23B and the Y-axis nut member 24B that moves along the guide rod 26 and the guide portion 27 that are arranged in parallel to each other. To do.

  In the moving mechanism 13, when the X-axis servo motor 22A rotates the X-axis screw rod 23A, the pair of X-axis nut members 24A move along the X-axis screw rod 23A, and the Y-axis screw rod 23B and the guide rod 26 is moved in the X-axis direction. When the Y-axis servo motor 22B rotates the Y-axis screw rod 23B, the Y-axis nut member 24B moves along the Y-axis screw rod 23B and moves the power supply coil 11 in the Y-axis direction. At this time, the guide part 27 connected to the power supply coil 11 moves along the guide rod 26 to move the power supply coil 11 in the Y-axis direction in a horizontal posture. Therefore, the rotation of the X-axis servo motor 22A and the Y-axis servo motor 22B can be controlled by the position detection controller 14 to move the power supply coil 11 in the X-axis direction and the Y-axis direction. However, the charging stand of the present invention does not specify the moving mechanism as the above mechanism. This is because any mechanism that can move the power supply coil 11 in the X-axis direction and the Y-axis direction can be used as the moving mechanism.

  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 shown in FIGS. 2 to 5 detects the position of the induction coil 51 built in the battery-equipped device 50 and causes the power supply coil 11 to approach the induction coil 51. Furthermore, the position detection controller 14 includes a first position detection controller 14A that roughly detects the position of the induction coil 51, and a second position detection controller 14B that precisely detects the position of the induction coil 51. The position detection controller 14 roughly detects the position of the induction coil 51 by the first position detection controller 14A, and controls the moving mechanism 13 to bring the position of the power supply coil 11 closer to the induction coil 51. Further, the moving mechanism 13 is controlled while accurately detecting the position of the induction coil 51 by the second position detection controller 14B, so that the position of the power supply coil 11 is brought close to the induction coil 51 accurately. The charging stand 10 can bring the power supply coil 11 close to the induction coil 51 quickly and more accurately.

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

  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 induction coil 51 in the X-axis direction, and a plurality of Y-axis detection coils 30B that detect the 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 induction coil 51, and preferably the interval (d) between the X-axis detection coils 30A is equal to the outer diameter (D) of the induction coil 51. 1 times to 1/4 times. The X-axis detection coil 30A can accurately detect the position of the induction 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. The interval (d) between the adjacent Y-axis detection coils 30B is also smaller than the outer diameter (D) of the induction coil 51, and preferably the interval (d) between the Y-axis detection coils 30B is the same as the X-axis detection coil 30A. The outer diameter (D) of the induction coil 51 is 1 to 1/4 times. The Y-axis detection coil 30B can also accurately detect the position of the induction coil 51 in the Y-axis direction by narrowing the interval (d).

  The detection signal generation circuit 31 outputs a pulse signal that is a position detection signal to the position detection coil 30 at a predetermined timing. The position detection coil 30 to which the position detection signal is input excites the induction coil 51 that approaches with the position detection signal. The excited induction coil 51 outputs an echo signal to the position detection coil 30 with the energy of the flowing current. Therefore, as shown in FIG. 13, the position detection coil 30 near the induction coil 51 induces an echo signal from the induction coil 51 with a predetermined time delay after the position detection 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 induction coil 51 is approaching the position detection coil 30 using the echo signal input from the reception 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 position detection controller 14 shown in FIG. 6 connects each position detection coil 30 to the reception circuit 32 via the switching circuit 34. Since the position detection controller 14 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 position detection controller 14 of FIG. 6 connects the plurality of position detection coils 30 in order with the switching circuit 34 controlled by the identification circuit 33 and connects to the receiving circuit 32. The detection signal generation circuit 31 is connected to the output side of the switching circuit 34 and outputs a position detection signal to the position detection coil 30. The level of the position detection signal output from the detection signal generation circuit 31 to the position detection coil 30 is extremely higher than the echo signal from the induction 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 position detection signal input from the detection signal generation circuit 31 to the reception circuit 32 and inputs the position detection 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 position detection signal and the echo signal. The echo signal output from the receiving circuit 32 is a signal delayed from the position detection signal by a predetermined timing, for example, several μsec to several hundred μsec. Since the delay time in which the echo signal is delayed from the position detection signal is a fixed time, a signal after a predetermined delay time from the position detection signal is used as an echo signal, and the induction coil 51 is added to the position detection coil 30 from the level of this echo signal. Determine if you are approaching.

  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 position detection signal and an echo signal. The identification circuit 33 determines whether the induction coil 51 is set close to the position detection coil 30 from the position detection signal and the 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 position detection signal as an echo signal, and further determines whether the induction 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 induction 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 position detection signal to the X-axis detection coil 30A connected to the identification circuit 33 every time each X-axis detection coil 30A is connected to the reception circuit 32, and a specific delay from the position detection signal. Whether or not the induction coil 51 is approaching the X-axis detection coil 30A is determined based on whether or not an echo signal is detected after time. The identification circuit 33 connects all the X-axis detection coils 30A to the reception circuit 32, and determines whether or not the induction coil 51 is close to each X-axis detection coil 30A. When the induction coil 51 approaches one of the X-axis detection coils 30A, an echo signal is detected in a state where the X-axis detection coil 30A is connected to the reception circuit 32. Therefore, the identification circuit 33 can detect the position of the induction 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 induction 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 induction coil 51 in the Y-axis direction.

  The identification circuit 33 controls the moving mechanism 13 from the detected X-axis direction and Y-axis direction to move the power supply coil 11 to a position approaching the induction coil 51. The identification circuit 33 controls the X-axis servomotor 22A of the moving mechanism 13 to move the power supply coil 11 to the position of the induction coil 51 in the X-axis direction. Further, the Y-axis servomotor 22B of the moving mechanism 13 is controlled to move the power supply coil 11 to the position of the induction coil 51 in the Y-axis direction.

  As described above, the first position detection controller 14 </ b> A moves the power supply coil 11 to a position approaching the induction coil 51. The above charging stand can charge the built-in battery 52 by transferring power from the power supply coil 11 to the induction coil 51 after the power supply coil 11 approaches the induction coil 51 by the first position detection controller 14A. However, the charging stand can further accurately control the position of the power supply coil 11 to approach the induction coil 51 and then carry power to charge the built-in battery 52. The power supply coil 11 is brought closer to the induction coil 51 more accurately by the second position detection controller 14B.

  The second position detection controller 14B controls the moving mechanism 13 by accurately detecting the position of the power supply 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 servo motor 22A and the Y-axis servo motor 22B of the moving mechanism 13 to move the power supply coil 11 in the X-axis direction and the Y-axis direction. Detect the oscillation frequency. FIG. 14 shows the characteristic that the oscillation frequency of the self-excited oscillation circuit changes. This figure shows changes in the oscillation frequency with respect to the relative displacement between the power supply coil 11 and the induction coil 51. As shown in this figure, the oscillation frequency of the self-excited oscillation circuit is highest at the position where the power supply coil 11 is closest to the induction 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 servomotor 22A of the moving mechanism 13 to move the power supply coil 11 in the X-axis direction, and stops at the position where the oscillation frequency becomes the highest. The Y-axis servo motor 22B is similarly controlled to move the power supply coil 11 in the Y-axis direction and stop at the position where the oscillation frequency becomes the highest. The second position detection controller 14B can move the power supply coil 11 to the position closest to the induction coil 51 as described above.

  In the above charging stand, after the position of the induction coil 51 is roughly detected by the first position detection controller 14A, fine adjustment is further performed by the second position detection controller 14B to bring the power supply coil 11 closer to the induction coil 51. However, the following position detection controller 44 shown in FIG. 15 can bring the power supply coil 11 closer to the induction coil 51 without fine adjustment.

  As shown in FIG. 15, the position detection controller 44 includes a plurality of position detection coils 30 fixed to the inner surface of the upper surface plate, and a detection signal generation circuit 31 that supplies a position detection signal to the position detection coil 30. A reception circuit 32 that receives an echo signal that is excited by a pulse supplied from the detection signal generation circuit 31 to the position detection coil 30 and is output from the induction coil 51 to the position detection coil 30; and the reception circuit 32 receives the echo signal. And an identification circuit 43 for determining the position of the power supply coil 11 from the echo signal. Further, the position detection controller 44 causes the discrimination circuit 43 to detect the level of the echo signal induced in each position detection coil 30 with respect to the position of the induction coil 51, that is, as shown in FIG. Is provided with a storage circuit 47 for storing the level of an echo signal that is induced after a predetermined time has elapsed by excitation with a position detection signal. The position detection controller 44 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 47, and The position of the induction coil 51 is detected.

  The position detection controller 44 obtains the position of the induction coil 51 from the level of the echo signal induced in each position detection coil 30 as follows. The position detection coil 30 shown in FIG. 15 includes a plurality of X axis detection coils 30A that detect the position of the induction coil 51 in the X axis direction, and a plurality of Y axis detection coils 30B that detect the position in the Y axis direction. A plurality of position detection coils 30 are fixed to the inner surface of the upper surface plate 21 at a predetermined interval. Each X-axis detection coil 30A has an elongated loop shape in the Y-axis direction, and each Y-axis detection coil 30B has an elongated loop shape in the X-axis direction. FIG. 16 shows the level of the echo signal induced by the X-axis position detection coil 30A in a state where the induction coil 51 is moved in the X-axis direction, and the horizontal axis shows the position of the induction 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 position detection controller 44 can determine the position of the induction 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 induction 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 induction coil 51 is at the center of the first X-axis position detection coil 30A, the level of the echo signal induced by the first X-axis position detection coil 30A as shown by the point A in FIG. Is the strongest. When the induction coil 51 is in the middle of the first X-axis position detection coil 30A and the third X-axis position detection coil 30A, as shown by a point B in FIG. 16, the first X-axis position detection coil 30A. And the level of the echo signal induced in the third 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 induction coil 51 is closest is the strongest, and the level of the echo signal decreases as the induction coil 51 moves away. Therefore, it can be determined which X-axis position detection coil 30A is closest to the induction coil 51 based 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 induction coil 51 is shifted from the X-axis position detection coil 30A having the strongest echo signal, and the relative position of the two X-axis position detection 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 induction coil 51 is located at the center of the two X-axis position detection coils 30A.

  The identification circuit 43 stores in the storage circuit 47 the level of the echo signal that is induced in each X-axis position detection coil 30 </ b> A with respect to the position of the induction coil 51 in the X-axis direction. When the induction coil 51 is placed, an echo signal is induced in one of the X-axis position detection coils 30A. Therefore, the identification circuit 43 detects that the induction coil 51 is mounted by an echo signal that is induced by the X-axis position detection coil 30A, that is, that the battery built-in device 50 is mounted on the charging stand 10. Furthermore, the position of the induction coil 51 in the X-axis direction can be determined by comparing the level of the echo signal induced in any of the X-axis position detection coils 30 </ b> A with the level stored in the storage circuit 47. . The identification circuit stores in the storage circuit a function for specifying the position of the induction coil 51 in the X-axis direction from the level ratio of the echo signal induced in the adjacent X-axis position detection coil, and the position of the induction coil 51 from this function. Can also be determined. This function is obtained by moving the induction coil 51 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 discriminating circuit 43 detects the level ratio of the echo signals induced in the two X-axis position detection coils 30A, and the induction 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 43 detects the position of the induction coil 51 in the X-axis direction from the echo signal induced in the X-axis position detection coil 30A. 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 identification circuit 43 detects the positions of the induction coil 51 in the X-axis direction and the Y-axis direction, the position detection controller 44 moves the power supply coil 11 to the position of the induction coil 51 with the position signal from the identification circuit 43. Let

  When the echo signal having the waveform as described above is detected, the charging base identification circuit 43 can recognize and identify that the induction 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, it is possible to stop the power supply on the assumption that something other than the induction coil 51 (for example, a metal foreign object) of the battery built-in device 50 is mounted. Further, when the waveform of the echo signal is not detected or identified, it is assumed that the induction coil 51 of the battery built-in device 50 is not mounted, and power is not supplied.

  The charging stand 10 supplies AC power to the power supply coil 11 with the AC power supply 12 in a state where the position detection controllers 14 and 44 control the moving mechanism 13 to bring the power supply coil 11 close to the induction coil 51. The AC power of the power supply coil 11 is transferred to the induction coil 51 and used for charging the built-in battery 52. When the battery built-in device 50 detects that the built-in battery 52 is fully charged, it stops charging and transmits a full charge signal to the charging stand 10. The battery built-in device 50 can output a full charge signal to the induction coil 51, transmit this full charge signal from the induction coil 51 to the power supply coil 11, and transmit full charge information to the charging stand 10. The battery built-in device 50 outputs an AC signal having a frequency different from that of the AC power source 12 to the induction coil 51, and the charging stand 10 can receive the AC signal by the power source coil 11 and detect full charge. 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 induction 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. 7 includes a full charge detection circuit 17 that detects the full charge of the built-in battery 52. The full charge detection circuit 17 detects a full charge signal output from the battery built-in device 50 to detect full charge of the built-in battery 52.

10 ... charging stand 11 ... power supply coil 11A ... inner coil
11a ... Lead wire 11B ... Outer coil
11b ... Lead wire 11X ... Intermediate connection point 12 ... AC power supply 13 ... Moving mechanism 14 ... Position detection controller 14A ... First position detection controller
14B ... Second position detection controller 16 ... Lead wire 17 ... Full-charge detection circuit 18 ... Circuit board 19 ... Conductive pattern 20 ... Case 21 ... Top plate 22 ... Servo motor 22A ... X-axis servo motor
22B ... Y-axis servo motor 23 ... Screw rod 23A ... X-axis screw rod
23B ... Y-axis screw rod 24 ... Nut material 24A ... X-axis nut material
24B ... Y-axis nut material 25 ... Belt 26 ... Guide rod 27 ... Guide part 30 ... Position detection coil 30A ... X-axis detection coil
30B ... Y-axis detection coil 31 ... Detection signal generation circuit 32 ... Reception circuit 33 ... Identification circuit 34 ... Switching circuit 35 ... Limiter circuit 36 ... A / D converter 43 ... Identification circuit 44 ... Position detection controller 47 ... Storage circuit 50 ... Battery built-in equipment 50A ... Battery built-in equipment
50B ... Battery built-in equipment 51 ... Induction coil 51A ... Induction coil
51B ... induction coil 52 ... built-in battery 53 ... rectifier circuit 54 ... charging circuit 55 ... series capacitor 56 ... short circuit 56A ... short circuit switch 57 ... control circuit 58 ... electrolytic capacitor 61 ... commercial power supply 62 ... switching power supply 63 ... switching element 63A ... First switching element
63B ... Second switching element 64 ... Switching circuit 65 ... Power adjustment circuit 66 ... Information transmission circuit 67 ... Information transmission circuit 72 ... AC power supply 73 ... Pair switching element 73A ... First pair switching element
73B ... Second pair switching element
73C ... Third pair switching element 74 ... Switching circuit 75 ... Oscillation circuit 76 ... Inversion circuit 77 ... Changeover switch 86 ... Efficiency detection circuit

Claims (10)

It consists of a charging base with an AC power supply connected to the power supply coil, and a battery built-in device that has an induction coil that is set on this charging base and electromagnetically coupled to the power supply coil.
A battery built-in device and a charging stand configured to charge the built-in battery of the battery built-in device with electric power conveyed from the power coil to the induction coil,
The power supply coil is composed of an inner coil that is a planar coil, and an outer coil of a planar coil that is located outside the inner coil and arranged in the same plane as the inner coil,
The AC power supply of the charging stand includes an inner coil excitation state in which AC power is supplied to the inner coil and no AC power is supplied to the outer coil, and an inner and outer coil excitation state in which AC power is supplied to both the inner coil and the outer coil. A switching circuit for switching between
A battery built-in device and a charging stand in which an AC power source is switched between an inner coil excited state and an inner / outer coil excited state by a battery built-in device set on the charging stand, and power is transferred to the induction coil of the battery built-in device.   2. The planar coil in which the inner coil and the outer coil are wound by α, wherein the inner coil has a lead wire disposed on the inner periphery of the planar coil, and the outer coil has a lead wire disposed on the outer periphery of the planar coil. Battery built-in equipment and charging stand as described in 1.   The battery built-in device and the charging stand according to claim 1 or 2, wherein the AC power supply of the charging stand switches between an inner coil excited state and an inner / outer coil excited state depending on the outer diameter of the induction coil of the battery built-in device.   The charging base and the battery built-in device are provided with an information transmission circuit for transmitting information, and the information transmission circuit transmits the outer diameter information of the induction coil from the battery built-in device to the charging base, and the AC power of the charging base is transmitted. The battery built-in device and the charging stand according to any one of claims 1 to 3, wherein the inner / outer coil excitation state and the inner / outer coil excitation state are switched by outer diameter information.   The charging stand includes an efficiency detection circuit that detects a power transmission efficiency for power transfer from the power supply coil to the induction coil, and the inner coil excitation state and the external power supply are set so that the AC power supply maximizes the power transmission efficiency detected by the efficiency detection circuit. The battery built-in device and the charging stand according to any one of claims 1 to 3, wherein the device is switched to a coil excitation state. The battery built-in device and the charging stand according to any one of claims 1 to 5, wherein the inner coil and the outer coil are mounted on a surface of a circuit board, and a lead wire of the inner coil is connected to a conductive pattern of the circuit board. .
  The AC power supply includes a power adjustment circuit that changes power supplied to the power supply coil, and the power adjustment circuit makes the supply power in the inner and outer coil excitation state larger than the supply power in the inner coil excitation state. The battery built-in apparatus and charging stand as described in any one of 6.   The charging stand and the battery built-in device have an information transmission circuit for transmitting information, and the information transmission circuit transmits necessary power information from the battery built-in device to the charging stand, and the AC power supply of the charging stand is supplied to the power coil. The power adjustment circuit for changing the power to be transmitted is provided, and the power adjustment circuit is configured to change the power supplied to the power supply coil according to the necessary power information to be transmitted. Built-in battery and charging stand.   When both the power coil and the induction coil are planar coils and the battery built-in device is set on the charging stand, the induction coil and the power coil are arranged close to each other and face each other. The battery built-in device and the charging stand according to any one of claims 1 to 8, wherein electric power is transferred to the battery.   The battery built-in device and the charging stand according to any one of claims 1 to 9, wherein the power supply coil and the induction coil are air-core planar coils.

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