WO2012173128A1 - Charging station - Google Patents

Charging station Download PDF

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Publication number
WO2012173128A1
WO2012173128A1 PCT/JP2012/065067 JP2012065067W WO2012173128A1 WO 2012173128 A1 WO2012173128 A1 WO 2012173128A1 JP 2012065067 W JP2012065067 W JP 2012065067W WO 2012173128 A1 WO2012173128 A1 WO 2012173128A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
power
position detection
battery
charging
Prior art date
Application number
PCT/JP2012/065067
Other languages
French (fr)
Japanese (ja)
Inventor
恭三 寺尾
遠矢　正一
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2012173128A1 publication Critical patent/WO2012173128A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/20—Electric propulsion with power supplied within the vehicle using propulsion power generated by humans or animals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B60L53/122—Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B60L53/124—Detection or removal of foreign bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B60L53/126—Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/35—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles
    • B60L53/38—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles specially adapted for charging by inductive energy transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/12—Bikes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the present invention relates to a charging stand on which a battery built-in device such as a battery pack or a mobile phone is placed on top and the power is transferred by electromagnetic induction to charge the built-in battery.
  • a battery built-in device such as a battery pack or a mobile phone
  • 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 internal battery.
  • This charging stand incorporates a power transmission coil that is excited by an AC power source.
  • a battery built-in device such as a battery pack or a portable device set on a charging base has a power receiving coil that is electromagnetically coupled to a power transmission coil of the charging base.
  • the battery built-in device also has a built-in circuit for rectifying the alternating current induced in the power receiving coil and supplying 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.
  • the above charging stand can be conveniently used by moving the power transmission coil to the position of the power reception coil. This is because the user can set the battery built-in device at a free position on the charging stand and charge the power receiving coil of the battery built-in device close to the power receiving coil.
  • a charging stand has been developed to achieve this. (See Patent Document 1)
  • the transmission efficiency in a state where power is transferred from the power transmission coil to the power reception coil by magnetic induction varies depending on the structure of the power reception coil of the battery built-in device, the resonance frequency, the coupling ratio between the power transmission coil and the power reception coil, the frequency of the power transmission coil, and the like.
  • a method of adjusting the frequency of the AC power supplied to the power transmission coil has been developed. (See Patent Document 2)
  • the charging base of Patent Document 1 described above includes a moving mechanism that moves the power transmission coil so as to approach the power reception coil, and can efficiently transmit power from the power transmission coil to the power reception coil.
  • a moving mechanism that moves the power transmission coil so as to approach the power reception coil, and can efficiently transmit power from the power transmission coil to the power reception coil.
  • a conductive or insulating foreign material such as metal is interposed between the power transmission coil and the power reception coil, there is a problem because the efficiency of transmitting power is deteriorated. Therefore, in such non-contact charging, it is important to detect intervening foreign matter.
  • the present invention was developed for the purpose of solving such problems.
  • An important object of the present invention is to provide a charging stand that can detect foreign matter.
  • the charging stand is a charging stand for the battery built-in device 50 including the battery 52 that is charged by the power conveyed to the power receiving coil 51.
  • the charging stand includes a power transmission coil 11 that is connected to the AC power source 12 and that conveys electromotive force to the power receiving coil 51.
  • the AC power supply 12 includes a control circuit 80 having a transmission efficiency detection unit 84 that detects transmission efficiency for carrying power to the battery built-in device 50. In the control circuit 80, the transmission efficiency detected by the transmission efficiency detection unit 84 is It is determined whether there is a foreign object between the charging stand and the battery built-in device 50. The above charging stand can determine the presence of foreign matter from the transmission efficiency.
  • the charging stand of the present invention incorporates the power transmission coil 11 and has a case 20 having an upper surface plate 21 on which the battery built-in device 50 is placed on the upper surface, and the power transmission coil 11 disposed on the upper surface plate.
  • the moving mechanism 13 that moves along the inner surface of the battery 21 and the position of the power receiving coil 51 of the battery built-in device 50 placed on the upper surface plate 21 are detected to control the moving mechanism 13 so that the power transmitting coil 11 approaches the power receiving coil 51.
  • the position detection controllers 14 and 64 and the position detection controllers 14 and 64 include a plurality of position detection coils 30 arranged at predetermined intervals on the back side of the upper surface plate 21, and pulse signals as position detection signals to the position detection coils 30.
  • the charging stand of the present invention is charged in the control circuit 80 when the transmission efficiency is less than or equal to a predetermined value, when the transmission efficiency is decreased by a predetermined value or more, or when the rate of change of the transmission efficiency is less than or equal to a predetermined value. It is determined that a foreign object exists between the base and the battery built-in device 50. The above charging stand can determine that there is a foreign object between the charging stand and the battery built-in device 50 due to such a change in transmission efficiency.
  • the position detection controllers 14 and 64 are arranged such that a part of the position detection coil 30 in which the position detection coil 30 is disposed adjacent to each other is overlapped with the adjacent position detection coil 30.
  • the identification circuit 33 discriminates the position of the power receiving coil 51 from the position detection coil 30 from which the maximum level echo signal is induced and the level of the echo signal of the position detection coil 30 provided on both sides thereof. To do.
  • the charging base described above has a feature that the position of the power receiving coil can be accurately detected by an echo signal induced in the position detecting coil, and the power transmitting coil can be brought close to the power receiving coil to efficiently carry power. This is because the charging base described above is disposed by overlapping a part of the position detection coil adjacent to the adjacent position detection coil, and the identification circuit is a position where the maximum level echo signal is induced. This is because the position of the power reception coil is determined from the detection coil and the level of the echo signal of the position detection coil disposed on both sides of the detection coil. By arranging a part of the position detection coils arranged adjacent to each other so as to overlap each other, as shown in FIG.
  • an area where the level of the echo signal induced in one position detection coil becomes the maximum level that is, In the peak vicinity region, the level of the echo signal induced in the position detection coils arranged on both sides of the peak detection region can be increased, and the width of the zero level region of the echo signal of the position detection coil on both sides in the peak vicinity region can be reduced. Further, in the vicinity of the peak, the identification circuit determines the position of the receiving coil not only from the echo signal of the maximum level but also from the level of the echo signal induced in the position detection coils on both sides. The position of the power receiving coil can be determined more accurately.
  • the position detection coil 30 is an elongated coil having a straight portion, and the adjacent position detection coils 30 are arranged so as to be displaced in a direction perpendicular to the longitudinal direction of the coils and adjacent to each other so as to overlap each other.
  • the overlapping amount (d) of the position detection coils 30 can be set to 1/2 to 9/10 of the lateral width (W) of the elongated coil.
  • the overlapping amount (d) between the position detection coils adjacent to each other is smaller than the lateral width (W) of the position detection coil, the level of the echo signals of the position detection coils on both sides in the peak vicinity region is increased.
  • the position of the coil can be accurately detected.
  • the overlapping amount (d) of the position detection coils 30 adjacent to each other so that the position detection coils overlap with each other can be set to 2/3 of the lateral width (W) of the elongated coil.
  • the overlapping amount (d) of the position detection coils is set to 2/3 of the lateral width (W) of the coils, so that the position detection coils are efficiently arranged in an overlapping state, and the both sides of the peak vicinity region are arranged.
  • the position of the power receiving coil can be accurately detected from the echo signal of the position detecting coil.
  • the position detection coil 30 has a plurality of X-axis position detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis position detection coils that detect the position in the Y-axis direction. 30B.
  • the above charging stand can accurately detect the positions in the X-axis direction and the Y-axis direction of the power receiving coil set on the upper surface plate by both the X-axis position detection coil and the Y-axis position detection coil. For this reason, this charging stand can set the device with a built-in battery at a free position in the X-axis direction and the Y-axis direction of the upper surface plate and allow the power transmission coil to approach the power reception coil.
  • the X-axis position detection coil 30A can be an elongated coil in the Y-axis direction
  • the Y-axis placement detection coil 30B can be an elongated coil in the X-axis direction.
  • the above charging stand can detect the positions of the receiving coil set on the top plate in the X-axis direction and the Y-axis direction over a wider range by widening the detection area of the X-axis position detection coil and the Y-axis position detection coil. .
  • the transmission efficiency detection unit 84 multiplies the power consumption or current value and voltage value consumed by the AC power supply 12 and the charging power or current and voltage for charging the battery 52 of the battery built-in device 50.
  • the transmission efficiency can be detected from the ratio of the charging power to the power consumption.
  • the above charging stand has a feature that the transmission efficiency detection unit can detect the transmission efficiency more accurately.
  • the charging stand according to the present invention is a charging stand that periodically receives battery information via the receiving coil 51 and the power transmission coil 11. When the battery information is no longer received periodically, the charging stand is placed on the top plate 21.
  • the position detection controllers 14 and 64 detect the position of the power receiving coil 51 of the battery built-in device 50 placed on the upper surface plate 21 again to control the moving mechanism 13.
  • the power transmission coil 11 is brought close to the power reception coil 51. Even if the battery built-in apparatus 50 shifts, the above charging stand can bring the power transmission coil 11 closer to the power receiving coil 51 again, so that the transmission efficiency detected again is good and stable. Thus, the presence of a foreign object can be determined from the transmission efficiency.
  • the charging stand of the present invention stores a predetermined value of transmission efficiency in the battery built-in device 50 and transmits the predetermined value of transmission efficiency to the control circuit 80.
  • the control circuit 80 compares the transmission efficiency with a predetermined value, determines whether there is a foreign object between the charging stand and the battery built-in device 50, and stops charging.
  • each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
  • the contents described in some examples and embodiments may be used in other examples and embodiments.
  • FIGS. 1 to 6 show a schematic configuration diagram and a principle diagram of a charging stand.
  • the charging stand 10 places the battery built-in device 50 on the charging stand 10 and charges the built-in battery 52 of the battery built-in device 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.
  • 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 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.
  • a charge control circuit 58 for charging the battery 52 with a direct current.
  • the charge control circuit 58 detects the full charge of the battery 52 and transmits a full charge signal indicating that the battery 52 is fully charged to the charging stand 10.
  • the charging stand 10 detects a full charge signal and stops charging.
  • the charging stand 10 includes a power transmission coil 11 that is connected to an AC power source 12 and conveys power to the power receiving coil 51, and the power transmission coil 11.
  • a case 20 having an upper surface plate 21 on which the power receiving coil 51 is mounted, a moving mechanism 13 that is built in the case 20 and moves the power transmission coil 11 along the inner surface of the upper surface plate 21 to approach the power receiving coil 51, and the upper surface plate 21.
  • a position detection controller 14 that detects the position of the battery built-in device 50 to be mounted and controls the moving mechanism 13 to bring the power transmission coil 11 closer to the power receiving coil 51 of the battery built-in device 50.
  • the charging stand 10 includes a power transmission coil 11, an AC power source 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.
  • the position detection controller 14 detects the position of the battery built-in device 50.
  • 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 transmission coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the power receiving coil 51.
  • the power transmission coil 11 approaching the power reception coil 51 is electromagnetically coupled to the power reception coil 51 and carries AC power to the power reception coil 51.
  • the battery built-in device 50 rectifies the AC power of the power receiving 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 battery 52 of the battery built-in device 50 through the above operation has the power transmission coil 11 connected to the AC power supply 12 built in the case 20.
  • the power transmission coil 11 is disposed below the upper surface plate 21 of the case 20 and is disposed so as to move 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 bringing the power transmission coil 11 closer to 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 top plate 21 on which the battery built-in device 50 is placed on the top surface.
  • the charging stand 10 shown in the figure 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 built-in devices 50 having different sizes and outer shapes can be placed thereon, for example, a quadrangle having a side of 5 cm to 30 cm, or a circle having a diameter of 5 cm to 30 cm.
  • the charging stand according to the present invention can also charge a built-in battery in order by mounting a plurality of battery-equipped devices together so that the top plate is enlarged, that is, a size capable of simultaneously loading a plurality of battery-equipped devices.
  • 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 transmission coil 11 is wound in a spiral shape 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.
  • 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 AC power supply 12 supplies, for example, high frequency power of 20 kHz to 1 MHz to the power transmission coil 11.
  • 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.
  • the AC power supply 12 includes an oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit.
  • the power transmission coil 11 is moved by the moving mechanism 13 so as to approach the power reception coil 51.
  • the moving mechanism 13 of FIGS. 1 to 4 moves the power transmission coil 11 along the upper surface plate 21 in the X-axis direction and the Y-axis direction to approach the power receiving coil 51.
  • the moving mechanism 13 shown in the figure 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, and the power transmission coil 11 is moved to the power receiving coil 51.
  • the servo motor 22 includes an X-axis servo motor 22A that moves the power transmission coil 11 in the X-axis direction and a Y-axis servo motor 22B that moves in the Y-axis direction.
  • the screw rod 23 includes a pair of X-axis screw rods 23A that move the power transmission coil 11 in the X-axis direction, and a Y-axis screw rod 23B that moves the power transmission 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 transmission coil 11 is connected to the Y-axis nut member 24B.
  • 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 transmission 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 coupled to the power transmission coil 11 so that the power transmission coil 11 can be moved along the guide rod 26 in the Y-axis direction.
  • the power transmission coil 11 moves in the Y-axis direction in a horizontal posture via the Y-axis nut member 24 ⁇ / b> B and the guide portion 27 that move along the Y-axis screw rod 23 ⁇ / b> B and the guide rod 26 arranged in parallel to each other. To do.
  • 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
  • the Y-axis screw rod 23B and the guide rod 26 is moved in the X-axis direction.
  • 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 transmission coil 11 in the Y-axis direction.
  • the guide part 27 connected to the power transmission coil 11 moves along the guide rod 26 to move the power transmission coil 11 in the Y-axis direction in a horizontal posture.
  • the rotation of the X-axis servomotor 22A and the Y-axis servomotor 22B can be controlled by the position detection controller 14, and the power transmission coil 11 can be moved in the X-axis direction and the Y-axis direction.
  • 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 transmission coil in the X-axis direction and the Y-axis direction can be used as the moving mechanism.
  • the charging stand of the present invention does not specify the moving mechanism as a mechanism that moves the power transmission coil in the X-axis direction and the Y-axis direction. That is, the charging stand of the present invention has a structure in which a linear guide wall is provided on the upper plate, and a battery built-in device is placed along the guide wall, and the power transmission coil can be moved linearly along the guide wall. Because it can be done.
  • the power transmission coil can be moved linearly along the guide wall as a moving mechanism that can move the power transmission coil only in one direction, for example, the X-axis direction.
  • 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 in FIGS. 1 to 4 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.
  • the position detection controller 14 generates a plurality of position detection coils 30 fixed to the inner surface of the upper surface plate 21, and generates a detection pulse for supplying a pulse signal as a position detection signal to the position detection coil 30.
  • a receiving circuit 32 that receives an echo signal that is excited by a pulse of a position detection signal supplied from the detection pulse generation circuit 31 to the position detection coil 30 and is output from the power receiving coil 51 to the position detection coil 30;
  • an identification circuit 33 for determining the position of the power receiving coil 51 from the echo signal received by the receiving circuit 32.
  • the position detection coil 30 is composed of a plurality of rows of coils, and the plurality of position detection coils 30 are arranged on the back side of the top plate 21.
  • the position detection coil 30 is fixed to the inner surface of the upper surface plate 21 and can be disposed on the back side of the upper surface plate 21.
  • the position detection coil 30 includes a plurality of X-axis position detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis position detection coils 30B that detect a position in the Y-axis direction.
  • the X-axis position detection coil 30A has a loop shape elongated in the Y-axis direction, and the plurality of X-axis position detection coils 30A are fixed to the inner surface of the upper surface plate 21 at a predetermined interval.
  • the Y-axis position detection coil 30B has a loop shape elongated in the X-axis direction, and the plurality of Y-axis position detection coils 30B are fixed to the inner surface of the upper surface plate 21 at a predetermined interval.
  • the position detection coil 30 is arranged such that a part of the position detection coil 30 disposed adjacent to the position detection coil 30 is overlapped.
  • the position detection coil 30 of the elongated coil is displaced in a direction orthogonal to the longitudinal direction of the coil, and the adjacent position detection coils 30 are arranged so as to overlap each other.
  • the X-axis position detection coil 30A has an elongated loop shape having a linear portion extending in the Y-axis direction, and the plurality of X-axis position detection coils 30A are displaced in the X-axis direction by a predetermined amount of overlap. It arrange
  • the Y-axis position detection coil 30B has an elongated loop shape having a linear portion extending in the X-axis direction, and the plurality of Y-axis position detection coils 30B are displaced in the Y-axis direction by a predetermined amount of overlap. It arrange
  • the overlapping amount (d) between the position detection coils 30 adjacent to each other so as to overlap each other is 2/3 of the lateral width (W) of the elongated coil.
  • the position detection coils 30 adjacent to each other are arranged so as to be displaced in the lateral width direction of the coil by 1/3 of the lateral width (W) of the coil.
  • the position detection coil 30 has an area where two adjacent position detection coils 30 overlap each other with 2/3 of each position detection coil 30 (hatching A and hatching B in FIG. 7).
  • the area where the three position detection coils 30 adjacent to each other overlap each other is a 1/3 area of each position detection coil 30 (the common part of hatching A and hatching B in FIG. 7).
  • the overlapping amount (d) between adjacent position detection coils 30 is 2/3 of the width (W) of the elongated coil, but the position detection coils are adjacent to each other so as to overlap each other.
  • the overlap amount (d) between the position detection coils can be set to 1/2 to 9/10 of the lateral width (W) of the elongated coil.
  • a position detection coil in which the overlap amount (d) between adjacent position detection coils so as to overlap each other is 1 ⁇ 2 of the lateral width (W) of the coil is not shown, but two adjacent position detection coils overlap each other.
  • the area is a half of each position detection coil.
  • a position detection coil in which the overlap amount (d) between adjacent position detection coils so as to overlap each other is 3/4 of the lateral width (W) of the coil is not shown, but two adjacent position detection coils are not shown.
  • the overlapping area of each position detection coil becomes a 3/4 area, and the overlapping area of the three position detection coils adjacent to each other becomes a 2/4 area of each position detection coil, and the four position detections adjacent to each other.
  • a region where the coils overlap is a quarter of each position detection coil.
  • the lateral width (W) of the position detection coil 30 is substantially equal to the outer diameter (D) of the power receiving coil 51, or is larger than the outer diameter (D), or is smaller than the outer diameter (D). is doing.
  • the position detection coil 30 can detect the position of the power receiving coil 51 with higher accuracy by narrowing the center interval (d).
  • the detection pulse generation circuit 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. 8, 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 from the reception circuit 32 to the identification circuit 33.
  • the identification circuit 33 determines whether or not the power receiving coil 51 is approaching the position detection coil 30 using 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 position detection controller 14 shown in FIG. 5 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 shown in FIG. 5 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 pulse generation circuit 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 detection pulse generation circuit 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 detection pulse generation circuit 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 ⁇ sec to several hundred ⁇ sec. 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 receiving 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 position detection coils 30A are sequentially connected to the receiving circuit 32. Each time the identification circuit 33 connects each X-axis position detection coil 30A to the reception circuit 32, the identification circuit 33 outputs a pulse signal to the X-axis position detection coil 30A connected to the identification circuit 33, and a specific delay from the pulse signal. Whether or not the receiving coil 51 is approaching the X-axis position detection coil 30A is determined based on whether or not an echo signal is detected after the time.
  • the identification circuit 33 connects all the X-axis position detection coils 30A to the reception circuit 32, and determines whether or not the power receiving coils 51 are close to the respective X-axis position detection coils 30A.
  • the identification circuit 33 can detect the position of the power receiving coil 51 in the X-axis direction from the X-axis position detection coil 30A that can detect an echo signal.
  • the identification circuit 33 determines the position of the power receiving coil 51 in the X-axis direction from the level of echo signals induced in the plurality of X-axis position detection coils 30A. Further, the identification circuit 33 similarly controls the Y-axis position detection coil 30Y to detect the position of the power receiving coil 51 in the Y-axis direction.
  • the identification circuit 33 controls the moving mechanism 13 from the position in the X axis direction and the position in the Y axis direction to be detected, and moves the power transmission coil 11 to a position approaching the power reception coil 51.
  • the identification circuit 33 controls the X-axis servomotor 22 ⁇ / b> A of the moving mechanism 13 to move the power transmission coil 11 to the position of the power reception coil 51 in the X-axis direction.
  • the Y-axis servomotor 22B of the moving mechanism 13 is controlled to move the power transmission coil 11 to the position of the power reception coil 51 in the Y-axis direction.
  • the position detection controller 14 moves the power transmission coil 11 to a position approaching the power reception coil 51.
  • the charging stand of the present invention can charge the battery 52 by transferring power from the power transmission coil 11 to the power reception coil 51 after the power transmission coil 11 approaches the power reception coil 51 by the position detection controller 14.
  • the charging stand further accurately controls the position of the power transmission coil 11 to approach the power receiving coil 51, and then transports power to charge the battery 52.
  • the position detection controller 64 shown in FIG. 9 causes the discrimination circuit 73 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, each position as shown in FIG.
  • a memory circuit 77 is provided for storing the level of an echo signal that is induced after a predetermined time has elapsed by exciting the detection coil 30 with a pulse signal.
  • the position detection controller 64 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 77, and The position of the power receiving coil 51 is detected.
  • the position detection controller 64 obtains 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. 10 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
  • 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 position detection controller 64 detects the level of the echo signal induced in each X-axis position detection coil 30A, and obtains the position of the power receiving coil 51 in the X-axis direction. 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.
  • the first X-axis position detection coil 30A when the power receiving coil 51 is located between the first X-axis position detection coil 30A and the second X-axis position detection coil 30A, as shown by a point a in FIG. 10, 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 maximum and the same. Further, when the power receiving coil 51 is at a position deviated from the middle between the first X-axis position detection coil 30A and the second X-axis position detection coil 30A, the first X-axis position detection coil 30A and the second X-axis position The level ratio of the echo signal induced in the detection coil 30A changes. Therefore, the position of the power receiving coil 51 can be detected from the level ratio of echo signals induced in the first X-axis position detection coil 30A and the second X-axis position detection coil 30A.
  • the level of the echo signal induced in the second X-axis position detection coil 30A is , Become the strongest.
  • the level variation of the echo signal with respect to the movement distance of the power receiving coil 51 in the X-axis direction is small, and the level of the echo signal varies depending on other factors.
  • the position of the power receiving coil 51 is determined only by the level of the echo signal induced in the second X-axis position detection coil 30A, it cannot be accurately determined.
  • the first X-axis position detection coil 30A and the third X-axis position detection coil as well as the echo signal induced by the second X-axis position detection coil 30A The position of the power receiving coil 51 is also determined from the level of the echo signal induced by 30A.
  • the power receiving coil 51 is located at the center of the second X-axis position detection coil 30A, the levels of the echo signals induced in the first X-axis position detection coil 30A and the third X-axis position detection coil 30A are equal. Alternatively, the level of the echo signal becomes 0 level.
  • the identification circuit 33 is applied to the first X-axis position detection coil 30A and the third X-axis position detection coil 30A in a state where the echo signal induced in the second X-axis position detection coil 30A is at the maximum level. If the levels of the induced echo signals are equal or both are 0 level, it is determined that the power receiving coil 51 is located at the center of the second X-axis position detection coil 30A. When the position of the power receiving coil 51 is slightly shifted from the center portion of the second X-axis position detection coil 30A, an echo signal that is induced in the first X-axis position detection coil 30A and the third X-axis position detection coil 30A. The level of changes.
  • the identification circuit 33 accurately detects the position of the power receiving coil 51 from the level ratio of echo signals induced in the first X-axis position detection coil 30A and the second X-axis position detection coil 30A. can do. This is because as the power receiving coil 51 moves toward the first X-axis position detection coil 30A, the level of the echo signal induced in the first X-axis position detection coil 30A increases.
  • the identification circuit 33 can accurately detect the position 51 of the power receiving coil from the level ratio of echo signals induced in the second and third X-axis position detecting coils 30A. This is because as the power receiving coil 51 moves toward the third X-axis position detection coil 30A, the level of the echo signal induced in the third X-axis position detection coil 30A increases.
  • the identification circuit 33 does not determine the position of the power receiving coil 51 only from the echo signal of the position detection coil 30 at the maximum level in a state where the echo signal is at the maximum level.
  • the position of the power receiving coil 51 is determined in consideration of echo signals induced in the position detection coils 30 on both sides of the position detection coil 30 that detects the maximum level echo signal. Accordingly, the position of the power receiving coil 51 in the area A, which is the central portion of the position detection coil 30, can accurately detect even a slight deviation from the center of the position detection coil 30 at the maximum level.
  • the identification circuit 33 can also determine the position of the power receiving coil 51 only from the echo signal of the position detection coil 30 at the maximum level when the echo signal is at the maximum level.
  • the identification circuit 73 stores in the storage circuit 77 the level and level ratio of the echo signal induced in each X-axis position detection coil 30A with respect to the position of the power receiving coil 51 in the X-axis direction.
  • an echo signal is induced in one of the X-axis position detection coils 30A. Therefore, the identification circuit 73 detects that the power receiving coil 51 has been placed by an echo signal induced in the X-axis position detection coil 30 ⁇ / b> A, that is, that the battery built-in device 50 has been placed on the charging stand 10.
  • the level and level ratio of the echo signal induced in one of the X-axis position detection coils 30 ⁇ / b> A is compared with the level and level ratio stored in the storage circuit 77, and the position of the power receiving coil 51 in the X-axis direction. Is accurately determined.
  • the above shows a method in which the identification circuit 73 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.
  • the position detection controller 64 moves the power transmission coil 11 to the position of the power receiving coil 51 with the position signal from the identification circuit 73.
  • the identification circuit 73 of the charging stand can recognize and identify that the power receiving coil 51 of the battery built-in device 50 is mounted.
  • 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.
  • the power supply coil 51 of the battery built-in device 50 is not mounted and power is not supplied.
  • the AC power supply 12 includes a frequency adjustment circuit 81 that adjusts the frequency of the AC supplied to the power transmission coil 11 and a control circuit 80 that controls the frequency adjustment circuit 81. 6 also includes an output power adjustment circuit 82 for charging the battery 52 of the battery built-in device 50 with a predetermined power.
  • the control circuit 80 includes a charging power detection unit 83 that detects charging power for charging the battery 52 of the battery built-in device 50 set on the upper surface plate 21, and a transmission efficiency detection that detects transmission efficiency for carrying power to the battery built-in device 50.
  • the frequency adjustment circuit 81 is controlled by calculating the output frequency of the AC power supply 12 from the charging power of the battery 52 detected by the unit 84 and the charging power detection unit 83 and the transmission efficiency detected by the transmission efficiency detection unit 84. And an arithmetic unit 85.
  • the above AC power supply 12 controls the frequency adjustment circuit 81 by both the charging power and the transmission efficiency of the battery built-in device 50 and adjusts the frequency of the AC supplied to the power transmission coil 11 by the calculation unit 85 of the control circuit 80. To do.
  • the control circuit 80 specifies the output frequency of the AC power supply 12 by controlling the frequency adjustment circuit 81 so that the transmission efficiency is good and the battery 52 can be charged with a predetermined power.
  • FIG. 11 shows characteristics in which the transmission efficiency and the power for charging the battery 52 are changed by changing the output frequency of the AC power supply 12. As shown in this figure, the frequency at which transmission efficiency is maximized is not the same as the frequency at which charging power is maximized.
  • the frequency that maximizes the transmission efficiency decreases the charging power, while the frequency that maximizes the charging power decreases the transmission efficiency. Therefore, when the output frequency of the AC power supply 12 sets the transmission efficiency to the maximum value, the power for charging the battery 52, that is, the current decreases, and the charging time increases.
  • a predetermined value for example, 50%
  • the charging stand of the present invention does not charge only a specific battery built-in device.
  • Various types of battery built-in devices are placed on the top plate, and the batteries of a plurality of types of battery built-in devices are charged.
  • the transmission efficiency and charging power with respect to the frequency shown in FIG. 117 vary depending on the battery built-in device.
  • the control circuit 80 changes the frequency of the AC power supply 12 at a predetermined interval or continuously, so that the transmission efficiency detection unit 84 and the charging power detection unit 83 Then, the transmission efficiency and the charging power are detected, and the frequency is set to an optimum value by the calculation unit 85 from the detected transmission efficiency and the charging power.
  • the control circuit 80 specifies the output frequency as follows. (1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value. (2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized. (3) When the frequency is changed and the charging power of the battery 52 reaches the preset power, the calculation unit 85 controls the frequency adjustment circuit 81 so that the output frequency of the AC power supply 12 becomes the frequency. To control.
  • control circuit 80 can specify the output frequency as follows. (1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value. (2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized. (3) The arithmetic unit 85 controls the frequency adjustment circuit 81 when the frequency is changed and the charging power of the battery 52 does not reach the preset setting power, that is, when the charging power is smaller than the setting power. Then, the output frequency is specified as a frequency that maximizes the charging power.
  • control circuit 80 can specify the output frequency as follows. (1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value. (2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized. (3) The arithmetic unit 85 controls the frequency adjustment circuit 81 when the charge power of the battery 52 does not become the preset set power by changing the frequency, that is, when the charge power is smaller than the set power. The output frequency is set to the frequency at which the charging power becomes the maximum value, and the output power adjusting circuit 82 is controlled to set the charging power of the battery 52 as the set power.
  • the charging power detection unit 83 detects both the current and voltage for charging the battery 52 of the battery built-in device 50, or detects the charging current to detect the charging power or current and voltage of the battery 52. 6 receives the signal transmitted from the transmission unit 59 of the battery built-in device 50 by the reception unit 89, and detects the charging power (or current and voltage) of the battery 52.
  • the charging stand 10 detects the full charge of the battery 52 of the battery built-in device 50 and stops charging. Therefore, the receiving part 89 which detects the battery information transmitted from the battery built-in apparatus 50 is provided.
  • the charging power detection unit 83 detects battery information transmitted from the battery built-in device 50, and detects the charging power of the battery 52 by calculating the power from a value obtained by multiplying the current and voltage.
  • the battery information is transmitted from the battery built-in device to the 50 charging base 10 by wireless transmission or by modulation that changes the impedance or load of the power receiving coil 51.
  • the transmission efficiency detection unit 84 detects the input power of the AC power supply 12 and the charging power for charging the battery 52 of the battery built-in device 50, and detects the transmission efficiency from the ratio of the charging power to the input power.
  • the charging power is detected from the battery information input from the receiving unit 89.
  • the transmission efficiency detector 84 detects the transmission efficiency from the ratio of charging power / input power.
  • the AC power supply 12 of FIG. 6 includes a rectifier circuit 90 that converts the alternating current of the commercial power 99 that is input into direct current, and a DC / AC inverter that converts the direct current output from the rectifier circuit 90 into alternating current of a predetermined voltage and frequency. 91 is provided.
  • the DC / AC inverter 91 includes a switching element 92 that is switched on and off at a predetermined cycle, and an input circuit 93 that inputs an on / off signal to the switching element 92.
  • the AC power supply 12 controls the frequency adjustment circuit 81 with the control circuit 80, adjusts the cycle in which the frequency adjustment circuit 81 turns on and off the switching element 92 via the input circuit 93, and adjusts the output frequency of the DC / AC inverter 91. adjust. Further, the output power adjustment circuit 82 controls the output power by controlling the duty for controlling the switching element 92 to be turned on / off via the input circuit 93. Further, the output power adjustment circuit 82 turns off the switching element 92 via the input circuit 93 by the stop signal from the calculation unit 85 of the control circuit 80 to stop charging.
  • control circuit 80 detects the power consumption of the AC power supply 12 by detecting the power consumption of the DC / AC inverter 91 by the input power detection unit 87.
  • the input power detection unit 87 detects the average value of the current flowing through the switching element 92 and the voltage input to the DC / AC inverter 91, and determines the power consumption (consumed current value and voltage value) of the DC / AC inverter 91. (Multiplied value) is detected.
  • DC / AC inverter 9 The power consumption of 1 is comparable to the power consumption of the AC power supply 12. This is because the power efficiency of the rectifier circuit 90 is nearly 100%.
  • the transmission efficiency detector 84 detects the transmission efficiency by detecting the ratio between the power consumption of the DC / AC inverter 91 and the charging power of the battery 52.
  • the charging base 10 can easily adjust the frequency of the alternating current supplied to the power transmission coil 11 at the timing when the switching element 92 is turned on and off, and in order to detect the transmission efficiency, the power consumption from the input power of the DC / AC inverter 91. Therefore, the power consumption of the AC power supply 12 can be detected easily and accurately. This is because the detection of the DC voltage and current can be made easier than the detection of the AC voltage and current.
  • the battery information can be transmitted to the charging stand 10 as follows.
  • a battery information detection circuit 59 for detecting battery information of the built-in battery 52 is provided.
  • a detection circuit 17 (shown by a dotted line in FIG. 6) connected to the power transmission coil 11 is provided.
  • the battery built-in device 50 is further provided with a modulation circuit 161 (indicated by a dotted line in FIG. 6) that changes the impedance of the power receiving coil 51 based on the battery information of the built-in battery 52, and the charging base 10 is changed by the modulation circuit 161.
  • a detection circuit 17 that detects battery information by detecting a change in impedance of the power receiving coil 51 via the power transmission coil 11.
  • the modulation circuit 61 includes a load circuit 162 in which a switching element 164 (shown by a dotted line in FIG. 6) is connected in series to an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, and switching of the load circuit 162. And a control circuit 165 (shown by a dotted line in FIG. 6) for switching the element 164 on and off with battery information.
  • the control circuit 165 switches the switching element 164 on and off with the battery information and transmits the battery information to the charging stand 10.
  • the control circuit 165 includes a battery such as a charging battery voltage, a charging current, a battery temperature, a battery serial number, an allowable charging current for specifying the charging current of the battery, and an allowable temperature for controlling the charging of the battery.
  • the battery built-in device 50 includes a battery information detection circuit 59 that detects battery information of the built-in battery 52. With the battery information detection circuit 59, a battery such as a voltage of a charged battery, a charging current, a battery temperature, and the like. Information is detected and input to the control circuit 165.
  • the control circuit 165 transmits battery information by repeating a predetermined cycle, that is, a transmission timing for transmitting battery information and a non-transmission timing for not transmitting battery information at a predetermined cycle. This period is set to, for example, 0.1 sec to 5 sec, preferably 0.1 sec to 1 sec. Since the voltage, current, temperature, etc.
  • the modulation circuit 161 switches the switching element 164 on and off with a digital signal indicating the battery information, modulates the parallel capacity of the power receiving coil 51, and transmits the battery information.
  • the control circuit 165 provided in the modulation circuit 161 transmits the battery information by controlling the on / off of the switching element 164 at a speed of 1000 bps.
  • the control circuit 165 can also transmit battery information at 500 bps to 5000 bps.
  • the transmission of the battery information is stopped and the battery is charged in a normal state at the non-transmission timing.
  • the switching element 164 is switched on and off.
  • an impedance modulation capacitor 53 is connected to the power receiving coil 51. Since the impedance modulation capacitor 63 is connected in parallel to the power receiving coil 51, the efficiency of power transfer from the power transmitting coil 11 to the power receiving coil 51 is slightly lower than the designed optimum state.
  • the transmission timing is shorter than the non-transmission timing, and the timing at which the impedance modulation capacitor 63 is connected to the power receiving coil 51 is very short even at this transmission timing. Even if the power transfer efficiency is reduced in a state where the capacitor 63 is connected, the reduction in power transfer efficiency can be almost ignored in the total time.
  • the charging stand 10 detects the impedance change of the power receiving coil 51 from the voltage level change of the power transmission coil 11 and the battery information from the impedance change by the detection circuit 17.
  • the voltage level of the power transmitting coil 11 changes because the power transmitting coil 11 is electromagnetically coupled to the power receiving coil 51. Since the voltage level of the power transmission coil 11 changes in synchronization with the on / off of the switching element 64, the on / off state of the switching element 64 can be detected from the change in the voltage level of the power transmission coil 11.
  • the detection circuit 17 detects the digital signal indicating the battery information by detecting the on / off of the switching element 164 and is detected. From the digital signal, the voltage, current, temperature, etc. of the battery being charged can be detected. Thus, the charging stand 10 periodically receives battery information via the receiving coil 51 and the power transmission coil 11.
  • the detection circuit 17 can also detect battery information from any of change values such as a change in the current level of the power transmission coil 11, a change in phase with respect to the voltage of the current, or a change in transmission efficiency. This is because these characteristics of the power transmission coil 11 change due to the impedance change of the power reception coil 51.
  • the battery built-in device 50 is connected to the power receiving coil 51, converts alternating current induced in the power receiving coil 51 into direct current, and rectifies the alternating current of the power receiving coil 51, and a rectifier circuit 53 that supplies charging power to the internal battery 52.
  • a series capacitor 155 connected in series to the power receiving coil 51, an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, a series capacitor 155, the impedance modulation capacitor 53, and the power receiving coil 51 are input to the circuit 53.
  • a switching element 164 for switching the connection state between the two.
  • the battery built-in device 50 connects the impedance modulation capacitor 53 to the power reception coil 51 by the switching element 164, and the power transmission coil 11 to the power reception coil 51.
  • the power receiving coil 51 and the impedance modulation capacitor 53 are disconnected from each other, and the alternating current of the power receiving coil 51 is output to the rectifier circuit 57 via the series capacitor 155.
  • the battery built-in device 50 and the charging stand 10 constitute a parallel resonance circuit 5457 at all times to accurately detect the position of the power receiving coil 51, and at the time of charging, the impedance modulation capacitor 53 is disconnected to increase power efficiency.
  • the built-in battery 52 can be efficiently charged.
  • the echo signal can be generated because the impedance modulation capacitor 53 is connected in parallel with the power receiving coil 51 in a state where the position of the power receiving coil 51 is detected.
  • the reason why the internal battery 52 can be efficiently charged by increasing the power efficiency is that the internal battery 52 is charged in series with the power receiving coil 51 without connecting a capacitor in parallel with the power receiving coil 51. This is because the power of the power receiving coil 51 can be output to the rectifier circuit 53 by connecting a capacitor to the capacitor.
  • the circuit configuration in which the series capacitor 55 is connected to the power receiving coil 51 improves the power efficiency and suppresses the heat generation of the coil and the battery during charging, compared with the circuit configuration with a small transmission current connected to the power receiving coil, and the built-in battery 52 can be charged efficiently, promptly and safely.
  • the position detection controller 14 described above includes an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, a switching element 64 connecting the impedance modulation capacitor 53 to the power receiving coil 51, and turning on / off the switching element 64. And a control circuit 165 for controlling the switching element 164 to be turned on when the position of the power receiving coil 51 is detected.
  • the battery built-in device 50 having this circuit configuration can transmit battery information using the impedance modulation capacitor 163, the switching element 164, and the control circuit 165 provided as the position detection controller 14. This is because the impedance load of the power receiving coil 51 can be changed by switching the switching element 164 on and off with a digital signal of battery information by the control circuit 165.
  • the battery built-in device 50 does not have a dedicated circuit for transmitting battery information, that is, with the same hardware, only the software for the control circuit 65 to switch the switching element 64 on and off is changed. Can be transmitted.
  • the software can be stored in a memory provided in the control circuit 165. For this reason, this battery built-in apparatus 50 can transmit battery information to the charging stand 10 in an ideal state without increasing the manufacturing cost.
  • the battery built-in device 50 is detected.
  • the power supply can be stopped assuming that a coil other than the power receiving coil 51 (for example, a metal foreign object) is mounted.
  • the charging stand 10 charges the built-in battery 52 of the battery built-in device 50 by the following operation.
  • the position detection controller 14 detects the position of the battery built-in device 50 using the position detection coil 30.
  • 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 transmission coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the power receiving coil 51.
  • the power transmission coil 11 approaching the power reception coil 51 is electromagnetically coupled to the power reception coil 51 and carries AC power to the power reception coil 51.
  • the battery built-in device 50 rectifies the AC power of the power receiving coil 51 and converts it into direct current, and charges the built-in battery 52 with this direct current.
  • the transmission efficiency detection unit 84 detects the transmission efficiency from the ratio of charging power / input power. Since the power receiving coil 51 is accurately aligned on the power transmission coil 11, the transmission efficiency is good and stable. Normally, transmission efficiency of 60 to 65% can be obtained. Whether the transmission efficiency output from the transmission efficiency detection unit 84 is less than a predetermined value (for example, 50%) at the start of charging or during charging is calculated and determined by the calculation unit 85 of the control circuit 80. Is done. A value of 40 to 60% can be used as such a predetermined value.
  • a predetermined value for example, 50%
  • the metal foreign matter is interposed between the power transmission coil 11 and the power receiving coil, and in this embodiment, the metal foreign matter is interposed between the upper surface plate 21 and the lower surface of the battery built-in device 50.
  • a change between an initial value and a subsequent value, or a change in transmission efficiency at a predetermined time interval can be used.
  • a predetermined value or more when the transmission efficiency decreases from 65% to 50%, it decreases by 15%), it can be determined that metal foreign matter is present.
  • a value of 10 to 20% can be used as such a predetermined value.
  • a comparison between an initial value and a subsequent value, a comparison of transmission efficiency at a predetermined time interval, or the like can be used.
  • the predetermined value as described above is stored in the control circuit 80. However, a specific predetermined value is stored in the battery information detection circuit 59 of the battery built-in device 50 to be used, and this is used as the battery. Information can also be transmitted in the control circuit 80.
  • the battery information periodically transmitted as described above is transmitted via the reception coil 51 and the power transmission coil 11. Since the detection circuit 17 of the charging base 10 is not received, the calculation unit 85 of the control circuit 80 determines that there is no battery information, and the position detection controller 14 again performs the upper surface detection as described above. The position of the battery built-in device 50 placed on the plate 21 is detected, the power transmission coil 11 is moved closer to the power reception coil 51 and moved to an accurate position, and charging is performed.
  • the power transmission coil 11 is again approached to the power reception coil 51 and is accurately positioned. Since it can be moved and charged, even at this position, the transmission efficiency is good and stable, so the presence of a foreign object can be determined from the transmission efficiency.
  • the charging stand 10 on the upper surface plate 21 on which a plurality of battery built-in devices 50 can be placed is fully charged by sequentially switching the batteries 52 of the plurality of battery built-in devices 50.
  • the charging stand 10 first detects the position of the power receiving coil 51 of any of the battery built-in devices 50, makes the power transmitting coil 11 approach the power receiving coil 51, and fully charges the battery 52 of the battery built-in device 50. To do.
  • the position detection controller 14 is set to a second position different from the battery built-in device 50.
  • the position of the power receiving coil 51 of the battery built-in device 50 is detected, and the moving mechanism 13 is controlled to bring the power transmitting coil 11 closer to the power receiving coil 51 of the second battery built-in device 50. In this state, power is transferred to the battery 52 of the second battery-equipped device 50, and the battery 52 is fully charged. Further, when the battery 52 of the second battery built-in device 50 is fully charged and the full charge detection circuit 17 receives the full charge signal from the second battery built-in device 50, the position detection controller 14 further performs the third operation.
  • the power receiving coil 51 of the battery built-in device 50 is detected, the moving mechanism 13 is controlled to bring the power transmission coil 11 close to the power receiving coil 51 of the third battery built-in device 50, and the battery 52 of the battery built-in device 50 is moved.
  • Fully charge As described above, when the plurality of battery built-in devices 50 are set on the top 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.
  • the charging stand 10 stops the operation of the AC power supply 12 and stops the charging of the batteries 52.
  • the charging is stopped when the battery 52 of the battery built-in device 50 is fully charged.
  • the charging may be stopped when the battery 52 reaches a predetermined capacity. .
  • the above moving mechanism 13 moves the power transmission coil 11 in the X-axis direction and the Y-axis direction to move the power transmission coil 11 to a position closest to the power receiving coil 51.
  • the movement mechanism is in the X-axis direction.
  • the power transmission coil is moved in the Y-axis direction and the position of the power transmission coil is not specified as a structure for approaching the power reception coil, and the power transmission coil can be moved in various directions to approach the power reception coil.
  • the charging stand according to the present invention can be suitably used not only for charging a mobile phone or a portable music player but also for charging an assist bicycle or an electric vehicle.
  • position detection coil 30A ... X-axis position detection coil 30B ... Y-axis position detection coil 31 ... detection pulse generation circuit 32 ... reception circuit 33 ... identification circuit 34 ... switching circuit 35 ... limiter circuit 36 ... A / D converter 50 ... Electric Built-in device 51 ... Receiving coil 52 ... Battery 53 ... Condenser 54 ... Parallel resonance circuit 55 ... Diode 56 ... Smoothing capacitor 57 ... Rectifier circuit 58 ... Charge control circuit 59 ... Transmission unit 64 ... Position detection controller 73 ... Identification circuit 77 ... Memory Circuit 80 ... Control circuit 81 ... Frequency adjustment circuit 82 ... Output power adjustment circuit 83 ... Charge power detection unit 84 ... Transmission efficiency detection unit 85 ...
  • Calculation unit 87 ... Input power detection unit 89 ... Reception unit 90 ... Rectification circuit 91 ... DC / AC inverter 92 ... switching element 93 ... input circuit 99 ... commercial power supply 130 ... position detection coil 130A ... X-axis position detection coil 151 ... power receiving coil 155 ... series capacitor 161 ... modulation circuit 164 ... switching element 162 ... load circuit 165 ... control circuit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

[Problem] To provide a charging station capable of discovering metal and other foreign objects. [Solution] A charging station comprises a movement mechanism (13) for causing a power transmission coil (11) to moves along an inner surface of a top-surface plate (21), and a position detection controller (14, 64) for detecting the position of a power reception coil (51) of a device (50) with built-in cell that is placed on the top-surface plate (21), and controlling the movement mechanism (13) to bring the power transmission coil (11) close to the power reception coil (51). A control circuit (80) is provided having a transfer efficiency detection unit (84) for detecting the efficiency with which an alternating-current power supply (12) transmits electrical power to the device (50) with built-in cell, and from the transfer efficiency detected by the transfer efficiency detector (84), a determination is made in the control circuit (80) as to whether a foreign object is present between the charging station and the device (50) with built-in cell.

Description

充電台Charging stand
　本発明は、パック電池や携帯電話などの電池内蔵機器を上に載せて、電磁誘導作用で電力を搬送して内蔵電池を充電する充電台に関する。 The present invention relates to a charging stand on which a battery built-in device such as a battery pack or a mobile phone is placed on top and the power is transferred by electromagnetic induction to charge the built-in battery.
　電磁誘導の作用で送電コイルから受電コイルに電力搬送して、内蔵電池を充電する充電台は開発されている。この充電台は、交流電源で励磁される送電コイルを内蔵している。充電台にセットされるパック電池や携帯機器などの電池内蔵機器は、充電台の送電コイルに電磁結合される受電コイルを内蔵している。電池内蔵機器は、受電コイルに誘導される交流を整流し、これを電池に供給して充電する回路も内蔵している。この構造によると、充電台の上にパック電池を載せて、非接触状態でパック電池の電池を充電できる。 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 internal battery. This charging stand incorporates a power transmission coil that is excited by an AC power source. A battery built-in device such as a battery pack or a portable device set on a charging base has a power receiving coil that is electromagnetically coupled to a power transmission coil of the charging base. The battery built-in device also has a built-in circuit for rectifying the alternating current induced in the power receiving coil and supplying 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.
　以上の充電台は、送電コイルを受電コイルの位置に移動させることで便利に使用できる。それは、ユーザーが充電台の自由な位置に電池内蔵機器をセットして、電池内蔵機器の受電コイルに送電コイルを接近させて充電できるからである。このことを実現する充電台は開発されている。（特許文献１参照） The above charging stand can be conveniently used by moving the power transmission coil to the position of the power reception coil. This is because the user can set the battery built-in device at a free position on the charging stand and charge the power receiving coil of the battery built-in device close to the power receiving coil. A charging stand has been developed to achieve this. (See Patent Document 1)
　送電コイルから受電コイルに磁気誘導作用で電力搬送する状態における伝送効率は、電池内蔵機器の受電コイルの構造、共振周波数、送電コイルと受電コイルの結合率、送電コイルの周波数などによって変化する。伝送効率を改善するために、送電コイルに供給する交流電源の周波数を調整する方式が開発されている。（特許文献２参照） The transmission efficiency in a state where power is transferred from the power transmission coil to the power reception coil by magnetic induction varies depending on the structure of the power reception coil of the battery built-in device, the resonance frequency, the coupling ratio between the power transmission coil and the power reception coil, the frequency of the power transmission coil, and the like. In order to improve the transmission efficiency, a method of adjusting the frequency of the AC power supplied to the power transmission coil has been developed. (See Patent Document 2)
特開２００９－２４７１９４号公報JP 2009-247194 A 特開２０１０－１０４２０３号公報JP 2010-104203 A
　以上の特許文献１の充電台は、送電コイルを受電コイルに接近するように移動させる移動機構を備えており、送電コイルから受電コイルに効率良く、電力を伝送することができる。しかしながら、送電コイルと受電コイルとの間に、金属等の導電性、或いは、絶縁性の異物が介在すると、電力を伝送する効率が悪くなるので、問題である。従って、このような非接触充電においては、介在する異物を検出することが、重要である。 The charging base of Patent Document 1 described above includes a moving mechanism that moves the power transmission coil so as to approach the power reception coil, and can efficiently transmit power from the power transmission coil to the power reception coil. However, if a conductive or insulating foreign material such as metal is interposed between the power transmission coil and the power reception coil, there is a problem because the efficiency of transmitting power is deteriorated. Therefore, in such non-contact charging, it is important to detect intervening foreign matter.
　本発明は、このような問題を解決することを目的に開発されたものである。本発明の重要な目的は、異物を発見できる充電台を提供することにある。 The present invention was developed for the purpose of solving such problems. An important object of the present invention is to provide a charging stand that can detect foreign matter.
課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention
　本発明の充電台は、受電コイル５１に電力搬送される電力で充電される電池５２を内蔵する電池内蔵機器５０の充電台である。この充電台は、交流電源１２に接続されて受電コイル５１に起電力を電力搬送する送電コイル１１を備える。交流電源１２が、電池内蔵機器５０に電力搬送する伝送効率を検出する伝送効率検出部８４を有する制御回路８０を備え、前記制御回路８０において、伝送効率検出部８４で検出される伝送効率より、充電台と電池内蔵機器５０との間に異物が存在するかを判定する。
　以上の充電台は、伝送効率より、異物の存在を判定することができる。
　また、本発明の充電台は、この送電コイル１１を内蔵すると共に、上面には電池内蔵機器５０を載せる上面プレート２１を有するケース２０と、このケース２０に内蔵されて、送電コイル１１を上面プレート２１の内面に沿って移動させる移動機構１３と、上面プレート２１に載せられる電池内蔵機器５０の受電コイル５１の位置を検出して移動機構１３を制御して送電コイル１１を受電コイル５１に接近させる位置検出制御器１４、６４と位置検出制御器１４、６４は、上面プレート２１の裏側に所定の間隔で配置している複数の位置検出コイル３０と、位置検出コイル３０に位置検出信号としてパルス信号を供給する検出パルス発生回路３１と、この検出パルス発生回路３１から位置検出コイル３０に供給されるパルス信号に励起されて受電コイル５１から位置検出コイル３０に誘導されるエコー信号を受信する受信回路３２と、この受信回路３２が受信するエコー信号から受電コイル５１の位置を判別する識別回路３３とを備えている。
　以上の充電台は、送電コイルを受電コイルに接近するように移動させる移動機構を備えているので、伝送効率が良好で、安定していることより、伝送効率より、異物の存在を判定することができる。  The charging stand according to the present invention is a charging stand for the battery built-in device 50 including the battery 52 that is charged by the power conveyed to the power receiving coil 51. The charging stand includes a power transmission coil 11 that is connected to the AC power source 12 and that conveys electromotive force to the power receiving coil 51. The AC power supply 12 includes a control circuit 80 having a transmission efficiency detection unit 84 that detects transmission efficiency for carrying power to the battery built-in device 50. In the control circuit 80, the transmission efficiency detected by the transmission efficiency detection unit 84 is It is determined whether there is a foreign object between the charging stand and the battery built-in device 50.
The above charging stand can determine the presence of foreign matter from the transmission efficiency.
In addition, the charging stand of the present invention incorporates the power transmission coil 11 and has a case 20 having an upper surface plate 21 on which the battery built-in device 50 is placed on the upper surface, and the power transmission coil 11 disposed on the upper surface plate. The moving mechanism 13 that moves along the inner surface of the battery 21 and the position of the power receiving coil 51 of the battery built-in device 50 placed on the upper surface plate 21 are detected to control the moving mechanism 13 so that the power transmitting coil 11 approaches the power receiving coil 51. The position detection controllers 14 and 64 and the position detection controllers 14 and 64 include a plurality of position detection coils 30 arranged at predetermined intervals on the back side of the upper surface plate 21, and pulse signals as position detection signals to the position detection coils 30. Is excited by a pulse signal supplied from the detection pulse generation circuit 31 to the position detection coil 30. Includes a receiving circuit 32 for receiving an echo signal induced in the position detection coil 30 from electrostatic coil 51 and the identification circuit 33 to determine the position of the power receiving coil 51 from the echo signal received the receiving circuit 32.
Since the above charging stand has a moving mechanism that moves the power transmission coil so as to approach the power receiving coil, the transmission efficiency is good and stable, so the presence of foreign matter is determined from the transmission efficiency. Can do.
　また、本発明の充電台は、制御回路８０において、伝送効率が所定値以下のとき、伝送効率が所定値以上低下したとき、又は、伝送効率の変化率が所定値以下となったとき、充電台と電池内蔵機器５０との間に異物が存在していると判定する。
　以上の充電台は、このような伝送効率の変化によって、充電台と電池内蔵機器５０との間に異物が存在していると判定できる。 In addition, the charging stand of the present invention is charged in the control circuit 80 when the transmission efficiency is less than or equal to a predetermined value, when the transmission efficiency is decreased by a predetermined value or more, or when the rate of change of the transmission efficiency is less than or equal to a predetermined value. It is determined that a foreign object exists between the base and the battery built-in device 50.
The above charging stand can determine that there is a foreign object between the charging stand and the battery built-in device 50 due to such a change in transmission efficiency.
　また、本発明の充電台は、位置検出制御器１４、６４は、位置検出コイル３０が、隣接して配設してなる位置検出コイル３０の一部を隣の位置検出コイル３０に重ねて配設しており、識別回路３３が、最大レベルのエコー信号が誘導される位置検出コイル３０と、その両側に配設している位置検出コイル３０のエコー信号のレベルから受電コイル５１の位置を判別する。 Further, in the charging stand of the present invention, the position detection controllers 14 and 64 are arranged such that a part of the position detection coil 30 in which the position detection coil 30 is disposed adjacent to each other is overlapped with the adjacent position detection coil 30. The identification circuit 33 discriminates the position of the power receiving coil 51 from the position detection coil 30 from which the maximum level echo signal is induced and the level of the echo signal of the position detection coil 30 provided on both sides thereof. To do.
　以上の充電台は、位置検出コイルに誘導されるエコー信号でもって、受電コイルの位置を正確に検出して、送電コイルを受電コイルに接近させて効率よく電力搬送できる特徴がある。それは、以上の充電台が、隣接して配設している位置検出コイルの一部を隣の位置検出コイルに重ねて配設すると共に、識別回路が、最大レベルのエコー信号が誘導される位置検出コイルと、その両側に配設している位置検出コイルのエコー信号のレベルから受電コイルの位置を判別するからである。隣接して配置している位置検出コイルの一部を互いに重ねて配置することで、図１０に示すように、ひとつの位置検出コイルに誘導されるエコー信号のレベルが最大レベルとなる領域、すなわちピーク近傍領域において、その両側に配置している位置検出コイルに誘導されるエコー信号のレベルを大きくでき、さらにピーク近傍領域における両側の位置検出コイルのエコー信号の０レベル領域の幅を狭くでき、さらに、ピーク近傍領域においては、識別回路が、最大レベルのエコー信号のみでなく、両側の位置検出コイルに誘導されるエコー信号のレベルからも受電コイルの位置を判定するので、ピーク近傍領域においても、受電コイルの位置をより正確に判定できる。 The charging base described above has a feature that the position of the power receiving coil can be accurately detected by an echo signal induced in the position detecting coil, and the power transmitting coil can be brought close to the power receiving coil to efficiently carry power. This is because the charging base described above is disposed by overlapping a part of the position detection coil adjacent to the adjacent position detection coil, and the identification circuit is a position where the maximum level echo signal is induced. This is because the position of the power reception coil is determined from the detection coil and the level of the echo signal of the position detection coil disposed on both sides of the detection coil. By arranging a part of the position detection coils arranged adjacent to each other so as to overlap each other, as shown in FIG. 10, an area where the level of the echo signal induced in one position detection coil becomes the maximum level, that is, In the peak vicinity region, the level of the echo signal induced in the position detection coils arranged on both sides of the peak detection region can be increased, and the width of the zero level region of the echo signal of the position detection coil on both sides in the peak vicinity region can be reduced. Further, in the vicinity of the peak, the identification circuit determines the position of the receiving coil not only from the echo signal of the maximum level but also from the level of the echo signal induced in the position detection coils on both sides. The position of the power receiving coil can be determined more accurately.
　本発明の充電台は、位置検出コイル３０を直線部を有する細長いコイルとして、隣接する位置検出コイル３０を、コイルの長手方向に直交する方向に位置ずれして配置すると共に、互いに重なるように隣接してなる位置検出コイル３０同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の１／２ないし９／１０とすることができる。
　以上の充電台は、細長い位置検出コイルを並べている方向の受電コイルの位置を正確に検出できる。とくに、位置検出コイルを構成する直線部を等間隔に配置して、受電コイルの位置を正確に検出できる。また、互いに隣接する位置検出コイル同士の重なり量（ｄ）を位置検出コイルの横幅（Ｗ）よりも狭くすることで、ピーク近傍領域における両側の位置検出コイルのエコー信号のレベルを大きくして受電コイルの位置を正確に検出できる。 In the charging stand according to the present invention, the position detection coil 30 is an elongated coil having a straight portion, and the adjacent position detection coils 30 are arranged so as to be displaced in a direction perpendicular to the longitudinal direction of the coils and adjacent to each other so as to overlap each other. Thus, the overlapping amount (d) of the position detection coils 30 can be set to 1/2 to 9/10 of the lateral width (W) of the elongated coil.
The above charging stand can accurately detect the position of the power receiving coil in the direction in which the elongated position detecting coils are arranged. In particular, it is possible to accurately detect the position of the power receiving coil by arranging the linear portions constituting the position detecting coil at equal intervals. Further, by reducing the overlapping amount (d) between the position detection coils adjacent to each other to be smaller than the lateral width (W) of the position detection coil, the level of the echo signals of the position detection coils on both sides in the peak vicinity region is increased. The position of the coil can be accurately detected.
　本発明の充電台は、位置検出コイルが、互いに重なるように隣接してなる位置検出コイル３０同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の２／３とすることができる。
　以上の充電台は、位置検出コイルの重なり量（ｄ）をコイルの横幅（Ｗ）の２／３とすることで、効率よく位置検出コイルを重なる状態で配置しながら、ピーク近傍領域における両側の位置検出コイルのエコー信号から受電コイルの位置を正確に検出できる。 In the charging stand of the present invention, the overlapping amount (d) of the position detection coils 30 adjacent to each other so that the position detection coils overlap with each other can be set to 2/3 of the lateral width (W) of the elongated coil.
In the above charging stand, the overlapping amount (d) of the position detection coils is set to 2/3 of the lateral width (W) of the coils, so that the position detection coils are efficiently arranged in an overlapping state, and the both sides of the peak vicinity region are arranged. The position of the power receiving coil can be accurately detected from the echo signal of the position detecting coil.
　本発明の充電台は、位置検出コイル３０が、受電コイル５１のＸ軸方向の位置を検出する複数のＸ軸位置検出コイル３０Ａと、Ｙ軸方向の位置を検出する複数のＹ軸位置検出コイル３０Ｂとを備えることができる。
　以上の充電台は、Ｘ軸位置検出コイルとＹ軸位置検出コイルの両方で上面プレートにセットされる受電コイルのＸ軸方向とＹ軸方向の位置を正確に検出できる。このため、この充電台は、上面プレートのＸ軸方向とＹ軸方向の自由な位置に電池内蔵機器をセットして、送電コイルを受電コイルに接近できる。 In the charging stand of the present invention, the position detection coil 30 has a plurality of X-axis position detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis position detection coils that detect the position in the Y-axis direction. 30B.
The above charging stand can accurately detect the positions in the X-axis direction and the Y-axis direction of the power receiving coil set on the upper surface plate by both the X-axis position detection coil and the Y-axis position detection coil. For this reason, this charging stand can set the device with a built-in battery at a free position in the X-axis direction and the Y-axis direction of the upper surface plate and allow the power transmission coil to approach the power reception coil.
　本発明の充電台は、Ｘ軸位置検出コイル３０ＡをＹ軸方向に細長いコイルとして、Ｙ軸置検出コイル３０ＢをＸ軸方向に細長いコイルとすることができる。
　以上の充電台は、Ｘ軸位置検出コイルとＹ軸位置検出コイルの検出領域を広くして、上面プレートにセットされる受電コイルのＸ軸方向とＹ軸方向の位置をより広い範囲にわたって検出できる。 In the charging stand of the present invention, the X-axis position detection coil 30A can be an elongated coil in the Y-axis direction, and the Y-axis placement detection coil 30B can be an elongated coil in the X-axis direction.
The above charging stand can detect the positions of the receiving coil set on the top plate in the X-axis direction and the Y-axis direction over a wider range by widening the detection area of the X-axis position detection coil and the Y-axis position detection coil. .
　本発明の充電台は、伝送効率検出部８４が、交流電源１２の消費電力又は消費する電流値、電圧値を掛け算した値と、電池内蔵機器
５０の電池５２を充電する充電電力又は電流と電圧の掛け算した値とを検出して、消費電力に対する充電電力の比率から
伝送効率を検出することができる。
　以上の充電台は、伝送効率検出部が、より正確に伝送効率を検出できる特徴がある。 In the charging stand of the present invention, the transmission efficiency detection unit 84 multiplies the power consumption or current value and voltage value consumed by the AC power supply 12 and the charging power or current and voltage for charging the battery 52 of the battery built-in device 50. The transmission efficiency can be detected from the ratio of the charging power to the power consumption.
The above charging stand has a feature that the transmission efficiency detection unit can detect the transmission efficiency more accurately.
　本発明の充電台は、電池情報を、周期的に受信コイル５１、送電コイル１１を介して、受信する充電台であって、電池情報の周期的な受信がなくなったとき、上面プレート２１に載せられる電池内蔵機器５０がずれたとして、再度、前記位置検出制御器１４、６４にて、上面プレート２１に載せられる電池内蔵機器５０の受電コイル５１の位置を検出して移動機構１３を制御して前記送電コイル１１を前記受電コイル５１に接近させる。
　以上の充電台は、電池内蔵機器５０がずれたとしても、再度、送電コイル１１を受電コイル５１に接近させることができるので、再度、検出される伝送効率も、良好で、安定していることより、伝送効率より、異物の存在を判定することができる。
　本発明の充電台は、電池内蔵機器５０内に、伝送効率の所定値が保存され、この伝送効率の所定値を制御回路８０に、伝送する。
　本発明の充電台は、制御回路８０において、伝送効率を所定値に比較して、充電台と電池内蔵機器５０との間に異物が存在するかを判定し、充電を停止する。  The charging stand according to the present invention is a charging stand that periodically receives battery information via the receiving coil 51 and the power transmission coil 11. When the battery information is no longer received periodically, the charging stand is placed on the top plate 21. The position detection controllers 14 and 64 detect the position of the power receiving coil 51 of the battery built-in device 50 placed on the upper surface plate 21 again to control the moving mechanism 13. The power transmission coil 11 is brought close to the power reception coil 51.
Even if the battery built-in apparatus 50 shifts, the above charging stand can bring the power transmission coil 11 closer to the power receiving coil 51 again, so that the transmission efficiency detected again is good and stable. Thus, the presence of a foreign object can be determined from the transmission efficiency.
The charging stand of the present invention stores a predetermined value of transmission efficiency in the battery built-in device 50 and transmits the predetermined value of transmission efficiency to the control circuit 80.
In the charging stand of the present invention, the control circuit 80 compares the transmission efficiency with a predetermined value, determines whether there is a foreign object between the charging stand and the battery built-in device 50, and stops charging.
本発明の一実施例にかかる充電台の概略斜視図である。It is a schematic perspective view of the charging stand concerning one Example of this invention. 本発明の一実施例にかかる充電台の概略構成図である。It is a schematic block diagram of the charging stand concerning one Example of this invention. 図２に示す充電台の垂直縦断面図である。It is a vertical longitudinal cross-sectional view of the charging stand shown in FIG. 図２に示す充電台の垂直横断面図である。It is a vertical cross-sectional view of the charging stand shown in FIG. 本発明の一実施例にかかる充電台の位置検出制御器を示す回路図である。It is a circuit diagram which shows the position detection controller of the charging stand concerning one Example of this invention. 本発明の一実施例にかかる充電台と電池内蔵機器のブロック図である。It is a block diagram of the charging stand and battery built-in apparatus concerning one Example of this invention. 図５に示す位置検出コイルが重なる状態を示す概略図である。It is the schematic which shows the state which the position detection coil shown in FIG. 5 overlaps. パルス信号で励起された受電コイルから出力されるエコー信号の一例を示す図である。It is a figure which shows an example of the echo signal output from the receiving coil excited with the pulse signal. 本発明の他の実施例にかかる充電台の位置検出制御器を示す回路図である。It is a circuit diagram which shows the position detection controller of the charging stand concerning the other Example of this invention. 図９に示す位置検出制御器の位置検出コイルに誘導されるエコー信号のレベルを示す図である。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. 送電コイルに供給する交流の周波数に対する電池の充電電力と伝送効率の変化する特性を示すグラフである。It is a graph which shows the characteristic which the charging power and transmission efficiency of a battery change with respect to the frequency of the alternating current supplied to a power transmission coil.
　以下、本発明の実施の形態を図面に基づいて説明する。ただし、以下に示す実施の形態は、本発明の技術思想を具体化するための充電台を例示するものであって、本発明は充電台を以下のものに特定しない。なお、特許請求の範囲に示される部材を、実施の形態の部材に特定するものでは決してない。特に実施の形態に記載されている構成部材の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。なお、各図面が示す部材の大きさや位置関係等は、説明を明確にするため誇張していることがある。さらに以下の説明において、同一の名称、符号については同一もしくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。また、一部の実施例、実施形態において説明された内容は、他の実施例、実施形態等に利用可能なものもある。 Hereinafter, embodiments of the present invention will be described 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. In addition, the member shown by the claim is not what specifies the member of embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
　図１ないし図６は、充電台の概略構成図及び原理図を示している。充電台１０は、図１と図６に示すように、充電台１０の上に電池内蔵機器５０を載せて、電池内蔵機器５０の内蔵電池５２を磁気誘導作用で充電する。電池内蔵機器５０は、送電コイル１１に電磁結合される受電コイル５１を内蔵している。この受電コイル５１に誘導される電力で充電される電池５２を内蔵している。ここで、電池内蔵機器５０は、パック電池であっても良い。 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 the battery built-in device 50 on the charging stand 10 and charges the built-in battery 52 of the battery built-in device 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.
　図６は電池内蔵機器５０の回路図を示す。この電池内蔵機器５０は、受電コイル５１と並列にコンデンサー５３を接続している。コンデンサー５３と受電コイル５１は並列共振回路５４を構成する。図６の電池内蔵機器５０は、受電コイル５１から出力される交流を整流するダイオード５５と、整流された脈流を平滑化する平滑コンデンサー５６とからなる整流回路５７と、この整流回路５７から出力される直流で電池５２を充電する充電制御回路５８とを備える。充電制御回路５８は、電池５２の満充電を検出して、満充電されたことを示す満充電信号を充電台１０に伝送する。充電台１０は、満充電信号を検出して充電を停止する。 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 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 for charging the battery 52 with a direct current. The charge control circuit 58 detects the full charge of the battery 52 and transmits a full charge signal indicating that the battery 52 is fully charged to the charging stand 10. The charging stand 10 detects a full charge signal and stops charging.
　充電台１０は、図１ないし図６に示すように、交流電源１２に接続されて受電コイル５１に電力搬送する送電コイル１１と、この送電コイル１１を内蔵すると共に、上面には電池内蔵機器５０を載せる上面プレート２１を有するケース２０と、このケース２０に内蔵されて、送電コイル１１を上面プレート２１の内面に沿って移動させて、受電コイル５１に接近させる移動機構１３と、上面プレート２１に載せられる電池内蔵機器５０の位置を検出して、移動機構１３を制御して送電コイル１１を電池内蔵機器５０の受電コイル５１に接近させる位置検出制御器１４とを備える。充電台１０は、送電コイル１１と、交流電源１２と、移動機構１３と、位置検出制御器１４とをケース２０に内蔵している。 As shown in FIGS. 1 to 6, the charging stand 10 includes a power transmission coil 11 that is connected to an AC power source 12 and conveys power to the power receiving coil 51, and the power transmission coil 11. A case 20 having an upper surface plate 21 on which the power receiving coil 51 is mounted, a moving mechanism 13 that is built in the case 20 and moves the power transmission coil 11 along the inner surface of the upper surface plate 21 to approach the power receiving coil 51, and the upper surface plate 21. And a position detection controller 14 that detects the position of the battery built-in device 50 to be mounted and controls the moving mechanism 13 to bring the power transmission coil 11 closer to the power receiving coil 51 of the battery built-in device 50. The charging stand 10 includes a power transmission coil 11, an AC power source 12, a moving mechanism 13, and a position detection controller 14 in a case 20.
　この充電台１０は、以下の動作で電池内蔵機器５０の内蔵電池５２を充電する。
（１）ケース２０の上面プレート２１に電池内蔵機器５０が載せられると、この電池内蔵機器５０の位置が位置検出制御器１４で検出される。
（２）電池内蔵機器５０の位置を検出した位置検出制御器１４は、移動機構１３を制御して、移動機構１３でもって送電コイル１１を上面プレート２１に沿って移動させて電池内蔵機器５０の受電コイル５１に接近させる。
（３）受電コイル５１に接近する送電コイル１１は、受電コイル５１に電磁結合されて受電コイル５１に交流電力を搬送する。
（４）電池内蔵機器５０は、受電コイル５１の交流電力を整流して直流に変換し、この直流で内蔵電池５２を充電する。 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 transmission coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the power receiving coil 51.
(3) The power transmission coil 11 approaching the power reception coil 51 is electromagnetically coupled to the power reception coil 51 and carries AC power to the power reception coil 51.
(4) The battery built-in device 50 rectifies the AC power of the power receiving coil 51 and converts it into direct current, and charges the built-in battery 52 with this direct current.
　以上の動作で電池内蔵機器５０の電池５２を充電する充電台１０は、交流電源１２に接続している送電コイル１１をケース２０に内蔵している。送電コイル１１は、ケース２０の上面プレート２１の下に配設されて、上面プレート２１に沿って移動するように配置される。送電コイル１１から受電コイル５１への電力搬送の効率は、送電コイル１１を受電コイル５１に接近させて向上できる。したがって、送電コイル１１は、上面プレート２１の下にあって、できるかぎり上面プレート２１に接近して配設される。送電コイル１１は、上面プレート２１の上に載せられる電池内蔵機器５０の受電コイル５１に接近するように移動するので、上面プレート２１の下面に沿って移動できるように配設される。 The charging stand 10 that charges the battery 52 of the battery built-in device 50 through the above operation has the power transmission coil 11 connected to the AC power supply 12 built in the case 20. The power transmission coil 11 is disposed below the upper surface plate 21 of the case 20 and is disposed so as to move 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 bringing the power transmission coil 11 closer to 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.
　送電コイル１１を内蔵するケース２０は、電池内蔵機器５０を載せる平面状の上面プレート２１を上面に設けている。図の充電台１０は、上面プレート２１全体を平面状として水平に配設している。上面プレート２１は、大きさや外形が異なる種々の電池内蔵機器５０を上に載せることができる大きさ、たとえば、一辺を５ｃｍないし３０ｃｍとする四角形、又は直径を５ｃｍないし３０ｃｍとする円形としている。本発明の充電台は、上面プレートを大きくして、すなわち複数の電池内蔵機器を同時に載せることができる大きさとして、複数の電池内蔵機器を一緒に載せて内蔵電池を順番に充電することもできる。また、上面プレートは、その周囲に周壁などを設け、周壁の内側に電池内蔵機器をセットして、内蔵する電池を充電することもできる。 The case 20 containing the power transmission coil 11 is provided with a flat top plate 21 on which the battery built-in device 50 is placed on the top surface. The charging stand 10 shown in the figure 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 built-in devices 50 having different sizes and outer shapes can be placed thereon, for example, a quadrangle having a side of 5 cm to 30 cm, or a circle having a diameter of 5 cm to 30 cm. The charging stand according to the present invention can also charge a built-in battery in order by mounting a plurality of battery-equipped devices together so that the top plate is enlarged, that is, a size capable of simultaneously loading a plurality of battery-equipped devices. . 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.
　送電コイル１１は、上面プレート２１と平行な面で渦巻き状に巻かれて、上面プレート２１の上方に交流磁束を放射する。この送電コイル１１は、上面プレート２１に直交する交流磁束を上面プレート２１の上方に放射する。送電コイル１１は、交流電源１２から交流電力が供給されて、上面プレート２１の上方に交流磁束を放射する。送電コイル１１は、磁性材からなるコア１５に線材を巻いてインダクタンスを大きくできる。コア１５は、透磁率が大きいフェライト等の磁性材料で、上方を開放する壺形としている。壺形のコア１５は、渦巻き状に巻かれた送電コイル１１の中心に配置する円柱部１５Ａと、外側に配置される円筒部１５Ｂを底部で連結する形状としている。コア１５のある送電コイル１１は、磁束を特定部分に集束して、効率よく電力を受電コイル５１に伝送できる。ただ、送電コイルは、必ずしもコアを設ける必要はなく、空芯コイルとすることもできる。空芯コイルは軽いので、これを上面プレートの内面で移動する移動機構を簡単にできる。送電コイル１１は、受電コイル５１の外径にほぼ等しくして、受電コイル５１に効率よく電力搬送する。 The power transmission coil 11 is wound in a spiral shape 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.
　交流電源１２は、たとえば、２０ｋＨｚ～１ＭＨｚの高周波電力を送電コイル１１に供給する。交流電源１２は、可撓性のリード線１６を介して送電コイル１１に接続される。送電コイル１１が上面プレート２１に載せられる電池内蔵機器５０の受電コイル５１に接近するように移動されるからである。交流電源１２は、図示しないが、発振回路と、この発振回路から出力される交流を電力増幅するパワーアンプとを備える。 The AC power supply 12 supplies, for example, high frequency power of 20 kHz to 1 MHz to the power transmission coil 11. 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 supply 12 includes an oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit.
　送電コイル１１は、移動機構１３で受電コイル５１に接近するように移動される。図１ないし図４の移動機構１３は、送電コイル１１を、上面プレート２１に沿って、Ｘ軸方向とＹ軸方向に移動させて受電コイル５１に接近させる。図の移動機構１３は、位置検出制御器１４で制御されるサーボモータ２２でネジ棒２３を回転して、ネジ棒２３にねじ込んでいるナット材２４を移動して、送電コイル１１を受電コイル５１に接近させる。サーボモータ２２は、送電コイル１１をＸ軸方向に移動させるＸ軸サーボモータ２２Ａと、Ｙ軸方向に移動させるＹ軸サーボモータ２２Ｂとを備える。ネジ棒２３は、送電コイル１１をＸ軸方向に移動させる一対のＸ軸ネジ棒２３Ａと、送電コイル１１をＹ軸方向に移動させるＹ軸ネジ棒２３Ｂとを備える。一対のＸ軸ネジ棒２３Ａは、互いに平行に配設されて、ベルト２５に駆動されてＸ軸サーボモータ２２Ａで一緒に回転される。ナット材２４は、各々のＸ軸ネジ棒２３Ａにねじ込んでいる一対のＸ軸ナット材２４Ａと、Ｙ軸ネジ棒２３Ｂにねじ込んでいるＹ軸ナット材２４Ｂからなる。Ｙ軸ネジ棒２３Ｂは、その両端を一対のＸ軸ナット材２４Ａに回転できるように連結している。送電コイル１１はＹ軸ナット材２４Ｂに連結している。 The power transmission coil 11 is moved by the moving mechanism 13 so as to approach the power reception coil 51. The moving mechanism 13 of FIGS. 1 to 4 moves the power transmission coil 11 along the upper surface plate 21 in the X-axis direction and the Y-axis direction to approach the power receiving coil 51. The moving mechanism 13 shown in the figure 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, and the power transmission coil 11 is moved to the power receiving coil 51. To approach. The servo motor 22 includes an X-axis servo motor 22A that moves the power transmission coil 11 in the X-axis direction and a Y-axis servo motor 22B that moves in the Y-axis direction. The screw rod 23 includes a pair of X-axis screw rods 23A that move the power transmission coil 11 in the X-axis direction, and a Y-axis screw rod 23B that moves the power transmission 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 transmission coil 11 is connected to the Y-axis nut member 24B.
　さらに、図に示す移動機構１３は、送電コイル１１を水平な姿勢でＹ軸方向に移動させるために、Ｙ軸ネジ棒２３Ｂと平行にガイドロッド２６を配設している。ガイドロッド２６は、両端を一対のＸ軸ナット材２４Ａに連結しており、一対のＸ軸ナット材２４Ａと一緒に移動する。ガイドロッド２６は、送電コイル１１に連結されるガイド部２７を貫通しており、送電コイル１１をガイドロッド２６に沿ってＹ軸方向に移動できるようにしている。すなわち、送電コイル１１は、互いに平行に配設されるＹ軸ネジ棒２３Ｂとガイドロッド２６に沿って移動するＹ軸ナット材２４Ｂとガイド部２７を介して、水平な姿勢でＹ軸方向に移動する。 Furthermore, 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 transmission 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 coupled to the power transmission coil 11 so that the power transmission coil 11 can be moved along the guide rod 26 in the Y-axis direction. That is, the power transmission coil 11 moves in the Y-axis direction in a horizontal posture via the Y-axis nut member 24 </ b> B and the guide portion 27 that move along the Y-axis screw rod 23 </ b> B and the guide rod 26 arranged in parallel to each other. To do.
　この移動機構１３は、Ｘ軸サーボモータ２２ＡがＸ軸ネジ棒２３Ａを回転させると、一対のＸ軸ナット材２４ＡがＸ軸ネジ棒２３Ａに沿って移動して、Ｙ軸ネジ棒２３Ｂとガイドロッド２６をＸ軸方向に移動させる。Ｙ軸サーボモータ２２ＢがＹ軸ネジ棒２３Ｂを回転させると、Ｙ軸ナット材２４ＢがＹ軸ネジ棒２３Ｂに沿って移動して、送電コイル１１をＹ軸方向に移動させる。このとき、送電コイル１１に連結されたガイド部２７は、ガイドロッド２６に沿って移動して、送電コイル１１を水平な姿勢でＹ軸方向に移動させる。したがって、Ｘ軸サーボモータ２２ＡとＹ軸サーボモータ２２Ｂの回転を位置検出制御器１４で制御して、送電コイル１１をＸ軸方向とＹ軸方向に移動できる。ただし、本発明の充電台は、移動機構を以上のメカニズムには特定しない。移動機構には、送電コイルをＸ軸方向とＹ軸方向に移動できる全ての機構を利用できるからである。 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 transmission coil 11 in the Y-axis direction. At this time, the guide part 27 connected to the power transmission coil 11 moves along the guide rod 26 to move the power transmission coil 11 in the Y-axis direction in a horizontal posture. Therefore, the rotation of the X-axis servomotor 22A and the Y-axis servomotor 22B can be controlled by the position detection controller 14, and the power transmission coil 11 can be moved 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 transmission coil in the X-axis direction and the Y-axis direction can be used as the moving mechanism.
　さらに、本発明の充電台は、移動機構を、送電コイルをＸ軸方向とＹ軸方向に移動させる機構に特定しない。それは、本発明の充電台が、上面プレートに直線状のガイド壁を設けて、このガイド壁に沿って電池内蔵機器を載せる構造として、送電コイルをガイド壁に沿って直線上に移動できる構造とすることができるからである。この充電台は、図示しないが、送電コイルを、一方向、たとえばＸ軸方向にのみ移動できる移動機構として、送電コイルをガイド壁に沿って直線上に移動できる。 Furthermore, the charging stand of the present invention does not specify the moving mechanism as a mechanism that moves the power transmission coil in the X-axis direction and the Y-axis direction. That is, the charging stand of the present invention has a structure in which a linear guide wall is provided on the upper plate, and a battery built-in device is placed along the guide wall, and the power transmission coil can be moved linearly along the guide wall. Because it can be done. Although this charging stand is not shown, the power transmission coil can be moved linearly along the guide wall as a moving mechanism that can move the power transmission coil only in one direction, for example, the X-axis direction.
　位置検出制御器１４は、上面プレート２１に載せられた電池内蔵機器５０の位置を検出する。図１ないし図４の位置検出制御器１４は、電池内蔵機器５０に内蔵される受電コイル５１の位置を検出して、送電コイル１１を受電コイル５１に接近させる。 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 in FIGS. 1 to 4 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.
　位置検出制御器１４は、図５に示すように、上面プレート２１の内面に固定している複数の位置検出コイル３０と、この位置検出コイル３０に位置検出信号としてパルス信号を供給する検出パルス発生回路３１と、この検出パルス発生回路３１から位置検出コイル３０に供給される位置検出信号のパルスに励起されて受電コイル５１から位置検出コイル３０に出力されるエコー信号を受信する受信回路３２と、この受信回路３２が受信するエコー信号から受電コイル５１の位置を判別する識別回路３３とを備える。 As shown in FIG. 5, the position detection controller 14 generates a plurality of position detection coils 30 fixed to the inner surface of the upper surface plate 21, and generates a detection pulse for supplying a pulse signal as a position detection signal to the position detection coil 30. A receiving circuit 32 that receives an echo signal that is excited by a pulse of a position detection signal supplied from the detection pulse generation circuit 31 to the position detection coil 30 and is output from the power receiving coil 51 to the position detection coil 30; And an identification circuit 33 for determining the position of the power receiving coil 51 from the echo signal received by the receiving circuit 32.
　位置検出コイル３０は複数列のコイルからなり、複数の位置検出コイル３０を上面プレート２１の裏側に配置している。位置検出コイル３０は上面プレート２１の内面に固定されて、上面プレート２１の裏側に配置できる。位置検出コイル３０は、受電コイル５１のＸ軸方向の位置を検出する複数のＸ軸位置検出コイル３０Ａと、Ｙ軸方向の位置を検出する複数のＹ軸位置検出コイル３０Ｂとを備える。Ｘ軸位置検出コイル３０Ａは、Ｙ軸方向に細長いループ状で、複数のＸ軸位置検出コイル３０Ａは、所定の間隔で上面プレート２１の内面に固定されている。Ｙ軸位置検出コイル３０Ｂは、Ｘ軸方向に細長いループ状で、複数のＹ軸位置検出コイル３０Ｂは、所定の間隔で上面プレート２１の内面に固定されている。 The position detection coil 30 is composed of a plurality of rows of coils, and the plurality of position detection coils 30 are arranged on the back side of the top plate 21. The position detection coil 30 is fixed to the inner surface of the upper surface plate 21 and can be disposed on the back side of the upper surface plate 21. The position detection coil 30 includes a plurality of X-axis position detection coils 30A that detect the position of the power receiving coil 51 in the X-axis direction, and a plurality of Y-axis position detection coils 30B that detect a position in the Y-axis direction. The X-axis position detection coil 30A has a loop shape elongated in the Y-axis direction, and the plurality of X-axis position detection coils 30A are fixed to the inner surface of the upper surface plate 21 at a predetermined interval. The Y-axis position detection coil 30B has a loop shape elongated in the X-axis direction, and the plurality of Y-axis position detection coils 30B are fixed to the inner surface of the upper surface plate 21 at a predetermined interval.
　位置検出コイル３０は、隣接して配設している位置検出コイル３０の一部を隣の位置検出コイル３０に重ねて配設している。細長いコイルの位置検出コイル３０は、コイルの長手方向に直交する方向に位置ずれさせて、隣接する位置検出コイル３０を互いに重なるように配置している。Ｘ軸位置検出コイル３０Ａは、Ｙ軸方向に延びる直線部を有する細長いループ状であって、複数のＸ軸位置検出コイル３０Ａは、直線部をＸ軸方向に位置ずれさせて、所定の重なり量（ｄ）となるように上面プレート２１の裏側に配置している。Ｙ軸位置検出コイル３０Ｂは、Ｘ軸方向に延びる直線部を有する細長いループ状であって、複数のＹ軸位置検出コイル３０Ｂは、直線部をＹ軸方向に位置ずれさせて、所定の重なり量（ｄ）となるように上面プレート２１の裏側に配置している。 The position detection coil 30 is arranged such that a part of the position detection coil 30 disposed adjacent to the position detection coil 30 is overlapped. The position detection coil 30 of the elongated coil is displaced in a direction orthogonal to the longitudinal direction of the coil, and the adjacent position detection coils 30 are arranged so as to overlap each other. The X-axis position detection coil 30A has an elongated loop shape having a linear portion extending in the Y-axis direction, and the plurality of X-axis position detection coils 30A are displaced in the X-axis direction by a predetermined amount of overlap. It arrange | positions on the back side of the upper surface plate 21 so that it may become (d). The Y-axis position detection coil 30B has an elongated loop shape having a linear portion extending in the X-axis direction, and the plurality of Y-axis position detection coils 30B are displaced in the Y-axis direction by a predetermined amount of overlap. It arrange | positions on the back side of the upper surface plate 21 so that it may become (d).
　図５の位置検出コイル３０は、互いに重なるように隣接してなる位置検出コイル３０同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の２／３としている。いいかえると、互いに隣接する位置検出コイル３０を、コイルの横幅方向に、コイルの横幅（Ｗ）の１／３だけ位置ずれさせる状態で重ねて配置している。この位置検出コイル３０は、図７に示すように、互いに隣接する２つの位置検出コイル３０同士の重なり合う領域が、各位置検出コイル３０の２／３の領域（図７のハッチングＡ及びハッチングＢで表示）となり、互いに隣接する３つの位置検出コイル３０同士の重なり合う領域が、各位置検出コイル３０の１／３の領域（図７のハッチングＡ及びハッチングＢの共通部分）となる。図の位置検出コイル３０は、隣接する位置検出コイル３０同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の２／３としているが、位置検出コイルは、互いに重なるように隣接してなる位置検出コイル同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の１／２ないし９／１０とすることができる。 In the position detection coil 30 of FIG. 5, the overlapping amount (d) between the position detection coils 30 adjacent to each other so as to overlap each other is 2/3 of the lateral width (W) of the elongated coil. In other words, the position detection coils 30 adjacent to each other are arranged so as to be displaced in the lateral width direction of the coil by 1/3 of the lateral width (W) of the coil. As shown in FIG. 7, the position detection coil 30 has an area where two adjacent position detection coils 30 overlap each other with 2/3 of each position detection coil 30 (hatching A and hatching B in FIG. 7). The area where the three position detection coils 30 adjacent to each other overlap each other is a 1/3 area of each position detection coil 30 (the common part of hatching A and hatching B in FIG. 7). In the illustrated position detection coil 30, the overlapping amount (d) between adjacent position detection coils 30 is 2/3 of the width (W) of the elongated coil, but the position detection coils are adjacent to each other so as to overlap each other. The overlap amount (d) between the position detection coils can be set to 1/2 to 9/10 of the lateral width (W) of the elongated coil.
　互いに重なるように隣接する位置検出コイル同士の重なり量（ｄ）を、コイルの横幅（Ｗ）の１／２とする位置検出コイルは、図示しないが、互いに隣接する２つの位置検出コイル同士の重なり合う領域が、各位置検出コイルの１／２の領域となる。また、互いに重なるように隣接する位置検出コイル同士の重なり量（ｄ）を、コイルの横幅（Ｗ）の３／４とする位置検出コイルは、図示しないが、互いに隣接する２つの位置検出コイル同士の重なり合う領域が、各位置検出コイルの３／４の領域となり、互いに隣接する３つの位置検出コイル同士の重なり合う領域が、各位置検出コイルの２／４の領域となり、互いに隣接する４つの位置検出コイル同士の重なり合う領域が、各位置検出コイルの１／４の領域となる。 A position detection coil in which the overlap amount (d) between adjacent position detection coils so as to overlap each other is ½ of the lateral width (W) of the coil is not shown, but two adjacent position detection coils overlap each other. The area is a half of each position detection coil. A position detection coil in which the overlap amount (d) between adjacent position detection coils so as to overlap each other is 3/4 of the lateral width (W) of the coil is not shown, but two adjacent position detection coils are not shown. The overlapping area of each position detection coil becomes a 3/4 area, and the overlapping area of the three position detection coils adjacent to each other becomes a 2/4 area of each position detection coil, and the four position detections adjacent to each other. A region where the coils overlap is a quarter of each position detection coil.
　さらに、位置検出コイル３０の横幅（Ｗ）は、受電コイル５１の外径（Ｄ）にほぼ等しくし、あるいは、外径（Ｄ）よりも大きくし、あるいはまた、外径（Ｄ）よりも小さくしている。位置検出コイル３０は、中央間隔（ｄ）を狭くして、より高い精度で受電コイル５１の位置を検出できる。 Further, the lateral width (W) of the position detection coil 30 is substantially equal to the outer diameter (D) of the power receiving coil 51, or is larger than the outer diameter (D), or is smaller than the outer diameter (D). is doing. The position detection coil 30 can detect the position of the power receiving coil 51 with higher accuracy by narrowing the center interval (d).
　検出パルス発生回路３１は、所定のタイミングでパルス信号を位置検出コイル３０に出力する。パルス信号が入力される位置検出コイル３０は、パルス信号で接近する受電コイル５１を励起する。励起された受電コイル５１は、流れる電流のエネルギーでエコー信号を位置検出コイル３０に出力する。したがって、受電コイル５１の近くにある位置検出コイル３０は、図８に示すように、パルス信号が入力された後、所定の時間遅れて、受電コイル５１からのエコー信号が誘導される。位置検出コイル３０に誘導されるエコー信号は、受信回路３２から識別回路３３に出力される。 The detection pulse generation circuit 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. 8, 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 from the reception circuit 32 to the identification circuit 33.
　識別回路３３は、受信回路３２から入力されるエコー信号でもって、位置検出コイル３０に受電コイル５１が接近しているかどうかを判定する。複数の位置検出コイル３０にエコー信号が誘導されるとき、識別回路３３は、エコー信号レベルの大きい位置検出コイル３０にもっとも接近していると判定する。 The identification circuit 33 determines whether or not the power receiving coil 51 is approaching the position detection coil 30 using 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.
　図５に示す位置検出制御器１４は、各々の位置検出コイル３０を切換回路３４を介して受信回路３２に接続する。この位置検出制御器１４は、入力を順番に切り換えて複数の位置検出コイル３０に接続するので、ひとつの受信回路３２で複数の位置検出コイル３０のエコー信号を検出できる。ただし、各々の位置検出コイルに受信回路を接続してエコー信号を検出することもできる。 The position detection controller 14 shown in FIG. 5 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.
　図５の位置検出制御器１４は、識別回路３３で制御される切換回路３４で複数の位置検出コイル３０を順番に切り換えて受信回路３２に接続する。検出パルス発生回路３１は切換回路３４の出力側に接続されて、位置検出コイル３０にパルス信号を出力する。検出パルス発生回路３１から位置検出コイル３０に出力されるパルス信号のレベルは、受電コイル５１からのエコー信号に比較して極めて大きい。受信回路３２は、入力側にダイオードからなるリミッター回路３５を接続している。リミッター回路３５は、検出パルス発生回路３１から受信回路３２に入力されるパルス信号の信号レベルを制限して受信回路３２に入力する。信号レベルの小さいエコー信号は、制限されることなく受信回路３２に入力される。受信回路３２は、パルス信号とエコー信号の両方を増幅して出力する。受信回路３２から出力されるエコー信号は、パルス信号から所定のタイミング、たとえば数μｓｅｃ～数百μｓｅｃ遅れた信号となる。エコー信号がパルス信号から遅れる遅延時間は、一定
の時間であるから、パルス信号から所定の遅延時間後の信号をエコー信号とし、このエコー信号のレベルから位置検出コイル３０に受電コイル５１が接近しているかどうかを判定する。 The position detection controller 14 shown in FIG. 5 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 pulse generation circuit 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 detection pulse generation circuit 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 detection pulse generation circuit 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.
　受信回路３２は、位置検出コイル３０から入力されるエコー信号を増幅して出力するアンプである。受信回路３２は、パルス信号とエコー信号を出力する。識別回路３３は、受信回路３２から入力されるパルス信号とエコー信号から位置検出コイル３０に受電コイル５１が接近してセットされるかどうかを判定する。識別回路３３は、受信回路３２から入力される信号をデジタル信号に変換するＡ／Ｄコンバータ３６を備えている。このＡ／Ｄコンバータ３６から出力されるデジタル信号を演算してエコー信号を検出する。識別回路３３は、パルス信号から特定の遅延時間の後に入力される信号をエコー信号として検出し、さらにエコー信号のレベルから受電コイル５１が位置検出コイル３０に接近しているかどうかを判定する。 The receiving 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.
　識別回路３３は、複数のＸ軸位置検出コイル３０Ａを順番に受信回路３２に接続するように切換回路３４を制御して、受電コイル５１のＸ軸方向の位置を検出する。識別回路３３は、各々のＸ軸位置検出コイル３０Ａを受信回路３２に接続する毎に、識別回路３３に接続しているＸ軸位置検出コイル３０Ａにパルス信号を出力し、パルス信号から特定の遅延時間の後に、エコー信号が検出されるかどうかで、このＸ軸位置検出コイル３０Ａに受電コイル５１が接近しているかどうかを判定する。識別回路３３は、全てのＸ軸位置検出コイル３０Ａを受信回路３２に接続して、各々のＸ軸位置検出コイル３０Ａに受電コイル５１が接近しているかどうかを判定する。受電コイル５１がいずれかのＸ軸位置検出コイル３０Ａに接近していると、このＸ軸位置検出コイル３０Ａを受信回路３２に接続する状態でエコー信号が検出される。したがって、識別回路３３は、エコー信号を検出できるＸ軸位置検出コイル３０Ａから受電コイル５１のＸ軸方向の位置を検出できる。受電コイル５１が複数のＸ軸位置検出コイル３０Ａに跨って接近する状態では、複数のＸ軸位置検出コイル３０Ａからエコー信号が検出される。この状態において、識別回路３３は複数のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルから受電コイル５１のＸ軸方向の位置を判定する。さらに、識別回路３３は、Ｙ軸位置検出コイル３０Ｙも同じように制御して、受電コイル５１のＹ軸方向の位置を検出する。 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 position detection coils 30A are sequentially connected to the receiving circuit 32. Each time the identification circuit 33 connects each X-axis position detection coil 30A to the reception circuit 32, the identification circuit 33 outputs a pulse signal to the X-axis position detection coil 30A connected to the identification circuit 33, and a specific delay from the pulse signal. Whether or not the receiving coil 51 is approaching the X-axis position detection coil 30A is determined based on whether or not an echo signal is detected after the time. The identification circuit 33 connects all the X-axis position detection coils 30A to the reception circuit 32, and determines whether or not the power receiving coils 51 are close to the respective X-axis position detection coils 30A. When the power receiving coil 51 approaches one of the X-axis position detection coils 30A, an echo signal is detected in a state where the X-axis position detection coil 30A 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 position 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 position detection coils 30A, echo signals are detected from the plurality of X-axis position detection coils 30A. In this state, the identification circuit 33 determines the position of the power receiving coil 51 in the X-axis direction from the level of echo signals induced in the plurality of X-axis position detection coils 30A. Further, the identification circuit 33 similarly controls the Y-axis position detection coil 30Y to detect the position of the power receiving coil 51 in the Y-axis direction.
　識別回路３３は、検出するＸ軸方向の位置とＹ軸方向の位置から移動機構１３を制御して、送電コイル１１を受電コイル５１に接近する位置に移動させる。識別回路３３は、移動機構１３のＸ軸サーボモータ２２Ａを制御して、送電コイル１１を受電コイル５１のＸ軸方向の位置に移動させる。また、移動機構１３のＹ軸サーボモータ２２Ｂを制御して、送電コイル１１を受電コイル５１のＹ軸方向の位置に移動させる。 The identification circuit 33 controls the moving mechanism 13 from the position in the X axis direction and the position in the Y axis direction to be detected, and moves the power transmission coil 11 to a position approaching the power reception coil 51. The identification circuit 33 controls the X-axis servomotor 22 </ b> A of the moving 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 Y-axis servomotor 22B of the moving mechanism 13 is controlled to move the power transmission coil 11 to the position of the power reception coil 51 in the Y-axis direction.
　以上のようにして、位置検出制御器１４が送電コイル１１を受電コイル５１に接近する位置に移動させる。本発明の充電台は、位置検出制御器１４で送電コイル１１を受電コイル５１に接近した後、送電コイル１１から受電コイル５１に電力搬送して電池５２を充電することができる。ただ、充電台は、さらに送電コイル１１の位置を正確に制御して受電コイル５１に接近させた後、電力搬送して電池５２を充電する。 As described above, the position detection controller 14 moves the power transmission coil 11 to a position approaching the power reception coil 51. The charging stand of the present invention can charge the battery 52 by transferring power from the power transmission coil 11 to the power reception coil 51 after the power transmission coil 11 approaches the power reception coil 51 by the position detection controller 14. However, the charging stand further accurately controls the position of the power transmission coil 11 to approach the power receiving coil 51, and then transports power to charge the battery 52.
　さらに、図９に示す位置検出制御器６４は、識別回路７３に、受電コイル５１の位置に対する各々の位置検出コイル３０に誘導されるエコー信号のレベル、すなわち図８に示すように、各々の位置検出コイル３０をパルス信号で励起して所定の時間経過後に誘導されるエコー信号のレベルを記憶する記憶回路７７を備えている。この位置検出制御器６４は、各々の位置検出コイル３０に誘導されるエコー信号のレベルを検出し、検出したエコー信号のレベルを記憶回路７７に記憶しているエコー信号のレベルに比較して、受電コイル５１の位置を検出している。 Further, the position detection controller 64 shown in FIG. 9 causes the discrimination circuit 73 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, each position as shown in FIG. A memory circuit 77 is provided for storing the level of an echo signal that is induced after a predetermined time has elapsed by exciting the detection coil 30 with a pulse signal. The position detection controller 64 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 77, and The position of the power receiving coil 51 is detected.
　この位置検出制御器６４は、以下のようにして、各々の位置検出コイル３０に誘導されるエコー信号のレベルから、受電コイル５１の位置を求めている。図１０は、受電コイル５１をＸ軸方向に移動させる状態における、Ｘ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルを示しており、横軸が受電コイル５１のＸ軸方向の位置を示し、縦軸が各々のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルを示している。この位置検出制御器６４は
、各々のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルを
検出して、受電コイル５１のＸ軸方向の位置を求める。この図に示すように、受電コイル５１をＸ軸方向に移動すると、各々のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルは変化する。 The position detection controller 64 obtains 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. 10 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 position detection controller 64 detects the level of the echo signal induced in each X-axis position detection coil 30A, and obtains the position of the power receiving coil 51 in the X-axis direction. 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.
　たとえば、受電コイル５１が第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａの中間にあるとき、図１０の点ａで示すように、第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルは最大であって、かつ同じとなる。また、受電コイル５１が第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａの中間からずれる位置にあるとき、第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベル比が変化する。したがって、第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベル比から受電コイル５１の位置を検出できる。 For example, when the power receiving coil 51 is located between the first X-axis position detection coil 30A and the second X-axis position detection coil 30A, as shown by a point a in FIG. 10, 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 maximum and the same. Further, when the power receiving coil 51 is at a position deviated from the middle between the first X-axis position detection coil 30A and the second X-axis position detection coil 30A, the first X-axis position detection coil 30A and the second X-axis position The level ratio of the echo signal induced in the detection coil 30A changes. Therefore, the position of the power receiving coil 51 can be detected from the level ratio of echo signals induced in the first X-axis position detection coil 30A and the second X-axis position detection coil 30A.
　さらに、受電コイル５１が第２のＸ軸位置検出コイル３０Ａの中央部にあるとき、すなわち図１０のＡ領域にあるとき、第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルは、最も強くなる。ただ、受電コイル５１がＡ領域にあるときには、受電コイル５１のＸ軸方向の移動距離に対するエコー信号のレベル変動は少なく、また、エコー信号のレベルは、他の要因によっても変動するので、受電コイル５１がＡ領域にあるとき、第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルのみで受電コイル５１の位置を判定すると正確に判定できなくなる。したがって、識別回路３３は、この領域にあるとき、第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のみでなく、第１のＸ軸位置検出コイル３０Ａと第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルからも受電コイル５１の位置を判定する。受電コイル５１が第２のＸ軸位置検出コイル３０Ａの中央に位置するとき、第１のＸ軸位置検出コイル３０Ａと第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルは等しくなり、あるいは、エコー信号のレベルが０レベルとなる。したがって、識別回路３３は、第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号が最大レベルとなる状態で、第１のＸ軸位置検出コイル３０Ａと第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが等しく、あるいは両方が０レベルであると、受電コイル５１は第２のＸ軸位置検出コイル３０Ａの中央に位置すると判定する。受電コイル５１の位置が、第２のＸ軸位置検出コイル３０Ａの中央部からわずかにずれると、第１のＸ軸位置検出コイル３０Ａと第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが変化する。受電コイル５１が第１のＸ軸位置検出コイル３０Ａ側にずれると、第１のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが、第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルよりも大きくなる。したがって、この状態になると、識別回路３３は、第１のＸ軸位置検出コイル３０Ａと第２のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベル比から受電コイル５１の位置を正確に検出することができる。受電コイル５１が第１のＸ軸位置検出コイル３０Ａ側に移動するにしたがって、第１のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが大きくなるからである。反対に、受電コイル５１が第３のＸ軸位置検出コイル３０Ａ側にずれると、第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが、第１のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルよりも大きくなる。したがって、この状態になると、識別回路３３は、第２と第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベル比から受電コイルの位５１置を正確に検出することができる。受電コイル５１が第３のＸ軸位置検出コイル３０Ａ側に移動するにしたがって、第３のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルが大きくなるからである。 Furthermore, when the power receiving coil 51 is in the center of the second X-axis position detection coil 30A, that is, in the area A in FIG. 10, the level of the echo signal induced in the second X-axis position detection coil 30A is , Become the strongest. However, when the power receiving coil 51 is in the A region, the level variation of the echo signal with respect to the movement distance of the power receiving coil 51 in the X-axis direction is small, and the level of the echo signal varies depending on other factors. When 51 is in the A region, if the position of the power receiving coil 51 is determined only by the level of the echo signal induced in the second X-axis position detection coil 30A, it cannot be accurately determined. Therefore, when the identification circuit 33 is in this region, the first X-axis position detection coil 30A and the third X-axis position detection coil as well as the echo signal induced by the second X-axis position detection coil 30A The position of the power receiving coil 51 is also determined from the level of the echo signal induced by 30A. When the power receiving coil 51 is located at the center of the second X-axis position detection coil 30A, the levels of the echo signals induced in the first X-axis position detection coil 30A and the third X-axis position detection coil 30A are equal. Alternatively, the level of the echo signal becomes 0 level. Accordingly, the identification circuit 33 is applied to the first X-axis position detection coil 30A and the third X-axis position detection coil 30A in a state where the echo signal induced in the second X-axis position detection coil 30A is at the maximum level. If the levels of the induced echo signals are equal or both are 0 level, it is determined that the power receiving coil 51 is located at the center of the second X-axis position detection coil 30A. When the position of the power receiving coil 51 is slightly shifted from the center portion of the second X-axis position detection coil 30A, an echo signal that is induced in the first X-axis position detection coil 30A and the third X-axis position detection coil 30A. The level of changes. When the power receiving coil 51 is displaced toward the first X-axis position detection coil 30A, the level of the echo signal induced in the first X-axis position detection coil 30A is induced in the third X-axis position detection coil 30A. It becomes larger than the level of the echo signal. Therefore, in this state, the identification circuit 33 accurately detects the position of the power receiving coil 51 from the level ratio of echo signals induced in the first X-axis position detection coil 30A and the second X-axis position detection coil 30A. can do. This is because as the power receiving coil 51 moves toward the first X-axis position detection coil 30A, the level of the echo signal induced in the first X-axis position detection coil 30A increases. On the other hand, when the power receiving coil 51 is shifted to the third X-axis position detection coil 30A side, the level of the echo signal induced in the third X-axis position detection coil 30A is changed to the first X-axis position detection coil 30A. It becomes larger than the level of the induced echo signal. Therefore, in this state, the identification circuit 33 can accurately detect the position 51 of the power receiving coil from the level ratio of echo signals induced in the second and third X-axis position detecting coils 30A. This is because as the power receiving coil 51 moves toward the third X-axis position detection coil 30A, the level of the echo signal induced in the third X-axis position detection coil 30A increases.
　以上のように、識別回路３３は、エコー信号が最大レベルとなる状態においては、最大レベルとなる位置検出コイル３０のエコー信号のみから受電コイル５１の位置を判定しない。最大レベルのエコー信号を検出する位置検出コイル３０の両側にある位置検出コイル３０に誘導されるエコー信号も考慮して、受電コイル５１の位置を判定する。したがって、位置検出コイル３０の中央部であるＡ領域にある受電コイル５１の位置は、最大レベルとなる位置検出コイル３０の中央からのわずかなずれも正確に検出できる。
　なお、識別回路３３は、エコー信号が最大レベルとなる状態においては、最大レベルとなる位置検出コイル３０のエコー信号のみから受電コイル５１の位置を判定することもできる。 As described above, the identification circuit 33 does not determine the position of the power receiving coil 51 only from the echo signal of the position detection coil 30 at the maximum level in a state where the echo signal is at the maximum level. The position of the power receiving coil 51 is determined in consideration of echo signals induced in the position detection coils 30 on both sides of the position detection coil 30 that detects the maximum level echo signal. Accordingly, the position of the power receiving coil 51 in the area A, which is the central portion of the position detection coil 30, can accurately detect even a slight deviation from the center of the position detection coil 30 at the maximum level.
Note that the identification circuit 33 can also determine the position of the power receiving coil 51 only from the echo signal of the position detection coil 30 at the maximum level when the echo signal is at the maximum level.
　識別回路７３は、受電コイル５１のＸ軸方向の位置に対する、各々のＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルとレベル比を記憶回路７７に記憶している。受電コイル５１が置かれると、いずれかのＸ軸位置検出コイル３０Ａにエコー信号が誘導される。したがって、識別回路７３は、Ｘ軸位置検出コイル３０Ａに誘導されるエコー信号で受電コイル５１が載せられたこと、すなわち電池内蔵機器５０が充電台１０に載せられたことを検出する。さらに、いずれかのＸ軸位置検出コイル３０Ａに誘導されるエコー信号のレベルとレベル比を、記憶回路７７に記憶しているレベルとレベル比に比較して、受電コイル５１のＸ軸方向の位置を正確に判別する。 The identification circuit 73 stores in the storage circuit 77 the level and level ratio of the echo signal induced in each X-axis position detection coil 30A with respect to the position of the power receiving coil 51 in the X-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 73 detects that the power receiving coil 51 has been placed by an echo signal induced in the X-axis position detection coil 30 </ b> A, that is, that the battery built-in device 50 has been placed on the charging stand 10. Further, the level and level ratio of the echo signal induced in one of the X-axis position detection coils 30 </ b> A is compared with the level and level ratio stored in the storage circuit 77, and the position of the power receiving coil 51 in the X-axis direction. Is accurately determined.
　以上は、識別回路７３が、Ｘ軸位置検出コイル３０Ａに誘導されるエコー信号から、受電コイル５１のＸ軸方向の位置を検出する方法を示すが、受電コイル５１のＹ軸方向の位置もＸ軸方向と同じようにして、Ｙ軸位置検出コイル３０Ｂに誘導されるエコー信号から検出できる。 The above shows a method in which the identification circuit 73 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.
　識別回路７３が、受電コイル５１のＸ軸方向とＹ軸方向の位置を検出すると、この識別回路７３からの位置信号でもって、位置検出制御器６４は送電コイル１１を受電コイル５１の位置に移動させる。
　なお、上記のような波形のエコー信号が検出されたとき、充電台の識別回路７３は、電池内蔵機器５０の受電コイル５１が搭載されたと認識、識別することができる。エコー信号の波形とは異なる波形が検出、識別されるときは、電池内蔵機器５０の受電コイル５１以外（例えば、金属異物）のものが搭載されたとして、電力供給を停止することができる。また、エコー信号の波形が検出、識別されないときは、電池内蔵機器５０の受電コイル５１が搭載されていないとして、電力供給をしない。 When the identification circuit 73 detects the positions of the power receiving coil 51 in the X-axis direction and the Y-axis direction, the position detection controller 64 moves the power transmission coil 11 to the position of the power receiving coil 51 with the position signal from the identification circuit 73. Let
When the echo signal having the waveform as described above is detected, the identification circuit 73 of the charging stand 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.
　交流電源１２は、送電コイル１１に供給する交流の周波数を調整する周波数調整回路８１と、この周波数調整回路８１を制御する制御回路８０とを備える。さらに、図６の交流電源１２は、電池内蔵機器５０の電池５２を所定の電力で充電するために出力電力調整回路８２も備える。 The AC power supply 12 includes a frequency adjustment circuit 81 that adjusts the frequency of the AC supplied to the power transmission coil 11 and a control circuit 80 that controls the frequency adjustment circuit 81. 6 also includes an output power adjustment circuit 82 for charging the battery 52 of the battery built-in device 50 with a predetermined power.
　制御回路８０は、上面プレート２１にセットされる電池内蔵機器５０の電池５２を充電する充電電力を検出する充電電力検出部８３と、電池内蔵機器５０に電力搬送する伝送効率を検出する伝送効率検出部８４と、充電電力検出部８３で検出される電池５２の充電電力と、伝送効率検出部８４で検出される伝送効率から交流電源１２の出力周波数を演算して、周波数調整回路８１を制御する演算部８５とを備えている。 The control circuit 80 includes a charging power detection unit 83 that detects charging power for charging the battery 52 of the battery built-in device 50 set on the upper surface plate 21, and a transmission efficiency detection that detects transmission efficiency for carrying power to the battery built-in device 50. The frequency adjustment circuit 81 is controlled by calculating the output frequency of the AC power supply 12 from the charging power of the battery 52 detected by the unit 84 and the charging power detection unit 83 and the transmission efficiency detected by the transmission efficiency detection unit 84. And an arithmetic unit 85.
　以上の交流電源１２は、制御回路８０の演算部８５でもって、電池内蔵機器５０の充電電力と伝送効率の両方で周波数調整回路８１を制御して、送電コイル１１に供給する交流の周波数を調整する。制御回路８０は、伝送効率がよく、かつ電池５２を所定の電力で充電できるように、周波数調整回路８１を制御して、交流電源１２の出力周波数を特定する。交流電源１２の出力周波数を変化させて、伝送効率と、電池５２を充電する電力とが変化する特性を図１１に示している。この図に示すように、伝送効率を最大値とする周波数と、充電電力を最大値とする周波数とは同じでない。伝送効率を最大値とする周波数は充電電力を減少させ、反対に充電電力を最大値とする周波数は伝送効率を低下させる。したがって、交流電源１２の出力周波数が、伝送効率を最大値に設定すると、電池５２を充電する電力、すなわち電流が小さくなって充電時間が長くなる。
　充電開始時、或いは、充電中に、伝送効率検出部８４から出力される伝送効率が、所定値（例えば、５０％）以下であるかが、制御回路８０の演算部８５でもって、演算、判定される。所定値以下であれば、演算部８５から出力電力調整回路８２に、停止信号が出力される。 The above AC power supply 12 controls the frequency adjustment circuit 81 by both the charging power and the transmission efficiency of the battery built-in device 50 and adjusts the frequency of the AC supplied to the power transmission coil 11 by the calculation unit 85 of the control circuit 80. To do. The control circuit 80 specifies the output frequency of the AC power supply 12 by controlling the frequency adjustment circuit 81 so that the transmission efficiency is good and the battery 52 can be charged with a predetermined power. FIG. 11 shows characteristics in which the transmission efficiency and the power for charging the battery 52 are changed by changing the output frequency of the AC power supply 12. As shown in this figure, the frequency at which transmission efficiency is maximized is not the same as the frequency at which charging power is maximized. The frequency that maximizes the transmission efficiency decreases the charging power, while the frequency that maximizes the charging power decreases the transmission efficiency. Therefore, when the output frequency of the AC power supply 12 sets the transmission efficiency to the maximum value, the power for charging the battery 52, that is, the current decreases, and the charging time increases.
Whether the transmission efficiency output from the transmission efficiency detection unit 84 is less than a predetermined value (for example, 50%) at the start of charging or during charging is calculated and determined by the calculation unit 85 of the control circuit 80. Is done. If it is equal to or less than the predetermined value, a stop signal is output from the arithmetic unit 85 to the output power adjustment circuit 82.
　本発明の充電台は、特定の電池内蔵機器のみを充電するのではない。種々の電池内蔵機器を上面プレートに載せて、複数種の電池内蔵機器の電池を充電する。電池内蔵機器によって、図１１７に示す周波数に対する伝送効率や充電電力は変化する。制御回路８０は、上面プレート２１に電池内蔵機器５０がセットされると、交流電源１２の周波数を所定の間隔で、あるいは連続的に変化させて、伝送効率検出部８４と充電電力検出部８３とで、伝送効率と充電電力とを検出し、検出する伝送効率と充電電力から演算部８５で周波数を最適値に設定する。 The charging stand of the present invention does not charge only a specific battery built-in device. Various types of battery built-in devices are placed on the top plate, and the batteries of a plurality of types of battery built-in devices are charged. The transmission efficiency and charging power with respect to the frequency shown in FIG. 117 vary depending on the battery built-in device. When the battery built-in device 50 is set on the upper surface plate 21, the control circuit 80 changes the frequency of the AC power supply 12 at a predetermined interval or continuously, so that the transmission efficiency detection unit 84 and the charging power detection unit 83 Then, the transmission efficiency and the charging power are detected, and the frequency is set to an optimum value by the calculation unit 85 from the detected transmission efficiency and the charging power.
　制御回路８０は、以下のようにして出力周波数を特定する。
（１）周波数を変化させて、伝送効率検出部８４で伝送効率を検出し、伝送効率が最大値となる周波数を演算部８５で検出する。
（２）伝送効率を最大値とする周波数から、さらに周波数を高く、あるいは低くして、充電電力検出部８３で電池５２の充電電力を検出する。
（３）演算部８５は、周波数を変化させて電池５２の充電電力があらかじめ設定している設定電力になると、周波数調整回路８１を制御して、交流電源１２の出力周波数をその周波数となるように制御する。 The control circuit 80 specifies the output frequency as follows.
(1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value.
(2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized.
(3) When the frequency is changed and the charging power of the battery 52 reaches the preset power, the calculation unit 85 controls the frequency adjustment circuit 81 so that the output frequency of the AC power supply 12 becomes the frequency. To control.
　さらに制御回路８０は、以下のようにして出力周波数を特定することもできる。
（１）周波数を変化させて、伝送効率検出部８４で伝送効率を検出し、伝送効率が最大値となる周波数を演算部８５で検出する。
（２）伝送効率を最大値とする周波数から、さらに周波数を高く、あるいは低くして、充電電力検出部８３で電池５２の充電電力を検出する。
（３）演算部８５は、周波数を変化させて電池５２の充電電力があらかじめ設定している設定電力にならない場合は、すなわち、充電電力が設定電力よりも小さい場合は、周波数調整回路８１を制御して、出力周波数を充電電力を最大値とする周波数に特定する。 Further, the control circuit 80 can specify the output frequency as follows.
(1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value.
(2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized.
(3) The arithmetic unit 85 controls the frequency adjustment circuit 81 when the frequency is changed and the charging power of the battery 52 does not reach the preset setting power, that is, when the charging power is smaller than the setting power. Then, the output frequency is specified as a frequency that maximizes the charging power.
　さらに制御回路８０は、以下のようにして出力周波数を特定することもできる。
（１）周波数を変化させて、伝送効率検出部８４で伝送効率を検出し、伝送効率が最大値となる周波数を演算部８５で検出する。
（２）伝送効率を最大値とする周波数から、さらに周波数を高く、あるいは低くして、充電電力検出部８３で電池５２の充電電力を検出する。
（３）演算部８５は、周波数を変化させて電池５２の充電電力があらかじめ設定している設定電力にならない場合、すなわち、充電電力が設定電力よりも小さい場合は、周波数調整回路８１を制御して出力周波数を充電電力を最大値となる周波数とすると共に、出力電力調整回路８２を制御して、電池５２の充電電力を設定電力とする。 Further, the control circuit 80 can specify the output frequency as follows.
(1) The frequency is changed, the transmission efficiency detection unit 84 detects the transmission efficiency, and the calculation unit 85 detects the frequency at which the transmission efficiency becomes the maximum value.
(2) The charging power detection unit 83 detects the charging power of the battery 52 by increasing or decreasing the frequency from the frequency at which the transmission efficiency is maximized.
(3) The arithmetic unit 85 controls the frequency adjustment circuit 81 when the charge power of the battery 52 does not become the preset set power by changing the frequency, that is, when the charge power is smaller than the set power. The output frequency is set to the frequency at which the charging power becomes the maximum value, and the output power adjusting circuit 82 is controlled to set the charging power of the battery 52 as the set power.
　充電電力検出部８３は、電池内蔵機器５０の電池５２を充電する電流と電圧の両方を検出し、あるいは充電する電流を検出して、電池５２の充電電力、或いは電流と電圧を検出する。図６の充電台
１０は、電池内蔵機器５０の送信部５９から伝送される信号を受信部８９で受信して、電池５２の充電電力（或いは、電流と電圧）を検出する。充電台１０は、電池内蔵機器５０の電池５２の満充電を検
出して充電を停止する。したがって、電池内蔵機器５０から伝送される電池情報を検出する受信部８９を備えている。充電電力検出部８３は、電池内蔵機器５０から伝送される電池情報を検出して、電池５２の充電電力を、或いは電流と電圧の掛け算した値より電力を演算して、検出する。電池情報は、無線伝送によって、あるいは受電コイル５１のインピーダンスや負荷を変化させる変調によって、電池内蔵機器から５０充電台１０に伝送される。 The charging power detection unit 83 detects both the current and voltage for charging the battery 52 of the battery built-in device 50, or detects the charging current to detect the charging power or current and voltage of the battery 52. 6 receives the signal transmitted from the transmission unit 59 of the battery built-in device 50 by the reception unit 89, and detects the charging power (or current and voltage) of the battery 52. The charging stand 10 detects the full charge of the battery 52 of the battery built-in device 50 and stops charging. Therefore, the receiving part 89 which detects the battery information transmitted from the battery built-in apparatus 50 is provided. The charging power detection unit 83 detects battery information transmitted from the battery built-in device 50, and detects the charging power of the battery 52 by calculating the power from a value obtained by multiplying the current and voltage. The battery information is transmitted from the battery built-in device to the 50 charging base 10 by wireless transmission or by modulation that changes the impedance or load of the power receiving coil 51.
　伝送効率検出部８４は、交流電源１２の入力電力と、電池内蔵機器５０の電池５２を充電する充電電力とを検出して、入力電力に対する充電電力との比率から伝送効率を検出する。充電電力は受信部８９から入力される電池情報から検出される。伝送効率検出部８４は、充電電力／入力電力の比率から伝送効率を検出する。 The transmission efficiency detection unit 84 detects the input power of the AC power supply 12 and the charging power for charging the battery 52 of the battery built-in device 50, and detects the transmission efficiency from the ratio of the charging power to the input power. The charging power is detected from the battery information input from the receiving unit 89. The transmission efficiency detector 84 detects the transmission efficiency from the ratio of charging power / input power.
　図６の交流電源１２は、入力される商用電力９９の交流を直流に変換する整流回路９０と、この整流回路９０から出力される直流を所定の電圧と周波数の交流に変換するＤＣ／ＡＣインバータ９１を備えている。ＤＣ／ＡＣインバータ９１は、所定の周期でオンオフに切り換えられるスイッチング素子９２と、スイッチング素子９２にオンオフの信号を入力する入力回路９３とを備える。 The AC power supply 12 of FIG. 6 includes a rectifier circuit 90 that converts the alternating current of the commercial power 99 that is input into direct current, and a DC / AC inverter that converts the direct current output from the rectifier circuit 90 into alternating current of a predetermined voltage and frequency. 91 is provided. The DC / AC inverter 91 includes a switching element 92 that is switched on and off at a predetermined cycle, and an input circuit 93 that inputs an on / off signal to the switching element 92.
　この交流電源１２は、制御回路８０でもって周波数調整回路８１を制御し、周波数調整回路８１が入力回路９３を介してスイッチング素子９２をオンオフする周期を調整してＤＣ／ＡＣインバータ９１の出力周波数を調整する。また、出力電力調整回路８２が入力回路９３を介してスイッチング素子９２をオンオフに制御するデューティーを制御して、出力電力を制御する。
　また、制御回路８０の演算部８５からの停止信号により、出力電力調整回路８２が入力回路９３を介してスイッチング素子９２をオフにして、充電を停止する。 The AC power supply 12 controls the frequency adjustment circuit 81 with the control circuit 80, adjusts the cycle in which the frequency adjustment circuit 81 turns on and off the switching element 92 via the input circuit 93, and adjusts the output frequency of the DC / AC inverter 91. adjust. Further, the output power adjustment circuit 82 controls the output power by controlling the duty for controlling the switching element 92 to be turned on / off via the input circuit 93.
Further, the output power adjustment circuit 82 turns off the switching element 92 via the input circuit 93 by the stop signal from the calculation unit 85 of the control circuit 80 to stop charging.
　さらに、制御回路８０は、入力電力検出部８７でもって、ＤＣ／ＡＣインバータ９１の消費電力を検出して、交流電源１２の消費電力を検出する。入力電力検出部８７は、スイッチング素子９２に流れる電流の平均値と、ＤＣ／ＡＣインバータ９１に入力される電圧を検出して、ＤＣ／ＡＣインバータ９１の消費電力（消費する電流値、電圧値を掛け算した値）を検出する。ＤＣ／ＡＣインバータ９
１の消費電力は、交流電源１２の消費電力に匹敵する。整流回路９０の電力効率がほぼ１００％に近いからである。伝送効率検出部８４は、ＤＣ／ＡＣインバータ９１の消費電力と電池５２の充電電力との比率を検出して伝送効率を検出する。 Further, the control circuit 80 detects the power consumption of the AC power supply 12 by detecting the power consumption of the DC / AC inverter 91 by the input power detection unit 87. The input power detection unit 87 detects the average value of the current flowing through the switching element 92 and the voltage input to the DC / AC inverter 91, and determines the power consumption (consumed current value and voltage value) of the DC / AC inverter 91. (Multiplied value) is detected. DC / AC inverter 9
The power consumption of 1 is comparable to the power consumption of the AC power supply 12. This is because the power efficiency of the rectifier circuit 90 is nearly 100%. The transmission efficiency detector 84 detects the transmission efficiency by detecting the ratio between the power consumption of the DC / AC inverter 91 and the charging power of the battery 52.
　以上の充電台１０は、スイッチング素子９２をオンオフするタイミングで簡単に送電コイル１１に供給する交流の周波数を調整できると共に、伝送効率を検出するために、ＤＣ／ＡＣインバータ９１の入力電力から消費電力を検出するので、交流電源１２の消費電力を簡単にしかも正確に検出できる。それは、直流の電圧と電流の検出が、交流の電圧と電流の検出よりも簡単にできるからである。 The charging base 10 can easily adjust the frequency of the alternating current supplied to the power transmission coil 11 at the timing when the switching element 92 is turned on and off, and in order to detect the transmission efficiency, the power consumption from the input power of the DC / AC inverter 91. Therefore, the power consumption of the AC power supply 12 can be detected easily and accurately. This is because the detection of the DC voltage and current can be made easier than the detection of the AC voltage and current.
　上記の実施例に代わって、以下のようにして、電池情報を、充電台１０に送信することもできる。
　上記の実施例における送信部５９に代わって、内蔵電池５２の電池情報を検出する電池情報検出回路５９とし、
受信部８９に代わって、送電コイル１１に接続された検出回路１７（図６に点線で示す）を備える。
電池内蔵機器５０は、内蔵電池５２の電池情報で受電コイル５１のインピーダンスを変化させる変調回路１６１（図６に点線で示す）を追加して備えており、充電台１０は、変調回路１６１で変化される受電コイ
ル５１のインピーダンスの変化を送電コイル１１を介して検出して電池情報を検出する検出回路１７を備えている。 Instead of the above embodiment, the battery information can be transmitted to the charging stand 10 as follows.
Instead of the transmission unit 59 in the above embodiment, a battery information detection circuit 59 for detecting battery information of the built-in battery 52 is provided.
Instead of the reception unit 89, a detection circuit 17 (shown by a dotted line in FIG. 6) connected to the power transmission coil 11 is provided.
The battery built-in device 50 is further provided with a modulation circuit 161 (indicated by a dotted line in FIG. 6) that changes the impedance of the power receiving coil 51 based on the battery information of the built-in battery 52, and the charging base 10 is changed by the modulation circuit 161. And a detection circuit 17 that detects battery information by detecting a change in impedance of the power receiving coil 51 via the power transmission coil 11.
　変調回路６１は、受電コイル５１と並列に接続しているインピーダンス変調用コンデンサー５３にスイッチング素子１６４（図６に点線で示す）を直列に接続している負荷回路１６２と、この負荷回路１６２のスイッチング素子１６４を電池情報でオンオフに切り換える制御回路１６５（図６に点線で示す）とを備えてい
る。制御回路１６５は、電池情報でスイッチング素子１６４をオンオフに切り換えて、電池情報を充電台１０に伝送する。制御回路１６５は、充電している電池の電圧、充電している電流、電池の温度、電池のシリアル番号、電池の充電電流を特定する許容充電電流、電池の充電をコントロールする許容温度等の電池情報をデジタル信号として、スイッチング素子１６４を制御して伝送する。電池内蔵機器５０は、内蔵電池５２の電池情報を検出する電池情報検出回路５９を備えており、この電池情報検出回路５９でもって、充電している電池の電圧、充電電流、電池温度等の電池情報を検出して制御回路１６５に入力している。制御回路１６５は、所定の周期で繰り返し、すなわち、電池情報を伝送する伝送タイミングと、電池情報を伝送しない非伝送タイミングとを所定の周期で繰り返して、電池情報を伝送する。この周期は、たとえば０．１ｓｅｃ～５ｓｅｃ、好ましくは０．１ｓｅｃ～１秒に設定される。充電している電池は、電圧、電流、温度などが変化するので、これ等の電池情報は、前述の周期で繰り返し伝送するが、電池のシリアル番号、電池の充電電流を特定する許容充電電流、電池の充電をコントロールする許容温度等の電池情報は、充電を開始する最初にのみ伝送して、その後に繰り返し伝送する必要はない。変調回路１６１は、伝送タイミングにおいては、電池情報を示すデジタル信号でスイッチング素子１６４をオンオフに切り換えて、受電コイル５１の並列容量性を変調して電池情報を伝送する。たとえば、変調回路１６１に設けている制御回路１６５は、１０００ｂｐｓのスピードでスイッチング素子１６４をオンオフ制御して、電池情報を伝送する。ただし、制御回路１６５は、５００ｂｐｓ～５０００ｂｐｓで電池情報を伝送することもできる。伝送タイミングにおいて１０００ｂｐｓで電池情報を伝送した後、非伝送タイミングにおいては、電池情報の伝送を停止して電池を正常な状態で充電する。伝送タイミングにおいて、スイッチング素子１６４がオンオフに切り換えられる。電池情報を伝送するために、受電コイル５１にインピーダンス変調用コンデンサー５３が接続される。インピーダンス変調用コンデンサー６３は、受電コイル５１に対して並列に接続されることから、送電コイル１１から受電コイル５１に電力搬送する効率を設計された最適状態よりも若干だが低下させる。ただ、伝送タイミングが非伝送タイミングに対して短い時間であり、また、この伝送タイミングにおいてもインピーダンス変調用コンデンサー６３が受電コイル５１に接続されるタイミングは非常に短いので、受電コイル５１にインピーダンス変調用コンデンサー６３を接続する状態で電力搬送の効率が低下しても、トータル時間では、電力搬送の効率低下はほとんど無視できる程度にできる。 The modulation circuit 61 includes a load circuit 162 in which a switching element 164 (shown by a dotted line in FIG. 6) is connected in series to an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, and switching of the load circuit 162. And a control circuit 165 (shown by a dotted line in FIG. 6) for switching the element 164 on and off with battery information. The control circuit 165 switches the switching element 164 on and off with the battery information and transmits the battery information to the charging stand 10. The control circuit 165 includes a battery such as a charging battery voltage, a charging current, a battery temperature, a battery serial number, an allowable charging current for specifying the charging current of the battery, and an allowable temperature for controlling the charging of the battery. Information is transmitted as a digital signal by controlling the switching element 164. The battery built-in device 50 includes a battery information detection circuit 59 that detects battery information of the built-in battery 52. With the battery information detection circuit 59, a battery such as a voltage of a charged battery, a charging current, a battery temperature, and the like. Information is detected and input to the control circuit 165. The control circuit 165 transmits battery information by repeating a predetermined cycle, that is, a transmission timing for transmitting battery information and a non-transmission timing for not transmitting battery information at a predetermined cycle. This period is set to, for example, 0.1 sec to 5 sec, preferably 0.1 sec to 1 sec. Since the voltage, current, temperature, etc. of the battery being charged change, such battery information is repeatedly transmitted in the above cycle, but the battery serial number, the allowable charging current for identifying the battery charging current, The battery information such as the allowable temperature for controlling the charging of the battery does not need to be transmitted only at the beginning of charging and then repeatedly transmitted thereafter. At the transmission timing, the modulation circuit 161 switches the switching element 164 on and off with a digital signal indicating the battery information, modulates the parallel capacity of the power receiving coil 51, and transmits the battery information. For example, the control circuit 165 provided in the modulation circuit 161 transmits the battery information by controlling the on / off of the switching element 164 at a speed of 1000 bps. However, the control circuit 165 can also transmit battery information at 500 bps to 5000 bps. After the battery information is transmitted at 1000 bps at the transmission timing, the transmission of the battery information is stopped and the battery is charged in a normal state at the non-transmission timing. At the transmission timing, the switching element 164 is switched on and off. In order to transmit battery information, an impedance modulation capacitor 53 is connected to the power receiving coil 51. Since the impedance modulation capacitor 63 is connected in parallel to the power receiving coil 51, the efficiency of power transfer from the power transmitting coil 11 to the power receiving coil 51 is slightly lower than the designed optimum state. However, the transmission timing is shorter than the non-transmission timing, and the timing at which the impedance modulation capacitor 63 is connected to the power receiving coil 51 is very short even at this transmission timing. Even if the power transfer efficiency is reduced in a state where the capacitor 63 is connected, the reduction in power transfer efficiency can be almost ignored in the total time.
　充電台１０は、検出回路１７でもって、送電コイル１１の電圧レベル変化から、受電コイル５１のインピーダンス変化を検出し、インピーダンス変化から電池情報を検出する。受電コイル５１のインピーダンスが変化すると、送電コイル１１が受電コイル５１に電磁結合していることから、送電コイル１１の電圧レベルが変化する。送電コイル１１の電圧レベルは、スイッチング素子６４のオンオフに同期して変化するので、送電コイル１１の電圧レベルの変化からスイッチング素子６４のオンオフを検出できる。変調回路１６１は、電池情報を示すデジタル信号でスイッチング素子６４をオンオフに切り換えているので、検出回路１７がスイッチング素子１６４のオンオフを検出することで、電池情報を示すデジタル信号を検出し、検出されるデジタル信号から、充電している電池の電圧、電流、温度などを検出することができる。
　このように、充電台１０は、電池情報を、周期的に受信コイル５１、送電コイル１１を介して、受信している。 The charging stand 10 detects the impedance change of the power receiving coil 51 from the voltage level change of the power transmission coil 11 and the battery information from the impedance change by the detection circuit 17. When the impedance of the power receiving coil 51 changes, the voltage level of the power transmitting coil 11 changes because the power transmitting coil 11 is electromagnetically coupled to the power receiving coil 51. Since the voltage level of the power transmission coil 11 changes in synchronization with the on / off of the switching element 64, the on / off state of the switching element 64 can be detected from the change in the voltage level of the power transmission coil 11. Since the modulation circuit 161 switches the switching element 64 on and off with a digital signal indicating battery information, the detection circuit 17 detects the digital signal indicating the battery information by detecting the on / off of the switching element 164 and is detected. From the digital signal, the voltage, current, temperature, etc. of the battery being charged can be detected.
Thus, the charging stand 10 periodically receives battery information via the receiving coil 51 and the power transmission coil 11.
　ただし、検出回路１７は、送電コイル１１の電流レベルの変化、電流の電圧に対する位相変化、あるいは伝送効率の変化等の変化値のいずれかから、電池情報を検出することもできる。受電コイル５１のインピーダンス変化によって、送電コイル１１のこれらの特性が変化するからである。 However, the detection circuit 17 can also detect battery information from any of change values such as a change in the current level of the power transmission coil 11, a change in phase with respect to the voltage of the current, or a change in transmission efficiency. This is because these characteristics of the power transmission coil 11 change due to the impedance change of the power reception coil 51.
　電池内蔵機器５０は、受電コイル５１に接続されて、受電コイル５１に誘導される交流を直流に変換して、内蔵電池５２に充電電力を供給する整流回路５３と、受電コイル５１の交流を整流回路５３に入力する、受電コイル５１に直列に接続してなる直列コンデンサー１５５と、受電コイル５１と並列に接続されるインピーダンス変調用コンデンサー５３と、直列コンデンサー１５５及びインピーダンス変調用コンデンサー５３と受電コイル５１との接続状態を切り換えるスイッチング素子１６４とを備えている。電池内蔵機器５０は、位置検出制御器１４が位置検出信号を出力する状態にあっては、スイッチング素子１６４によって、受電コイル５１にインピーダンス変調用コンデンサー５３を接続し、送電コイル１１から受電コイル５１に電力搬送する状態にあっては、受電コイル５１とインピーダンス変調用コンデンサー５３とを非接続状態として、直列コンデンサー１５５を介して受電コイル５１の交流を整流回路５７に出力する。 The battery built-in device 50 is connected to the power receiving coil 51, converts alternating current induced in the power receiving coil 51 into direct current, and rectifies the alternating current of the power receiving coil 51, and a rectifier circuit 53 that supplies charging power to the internal battery 52. A series capacitor 155 connected in series to the power receiving coil 51, an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, a series capacitor 155, the impedance modulation capacitor 53, and the power receiving coil 51 are input to the circuit 53. And a switching element 164 for switching the connection state between the two. When the position detection controller 14 outputs a position detection signal, the battery built-in device 50 connects the impedance modulation capacitor 53 to the power reception coil 51 by the switching element 164, and the power transmission coil 11 to the power reception coil 51. In the state of carrying power, the power receiving coil 51 and the impedance modulation capacitor 53 are disconnected from each other, and the alternating current of the power receiving coil 51 is output to the rectifier circuit 57 via the series capacitor 155.
　以上の電池内蔵機器５０と充電台１０は、常時は並列共振回路５４５７を構成して受電コイル５１の位置を正確に検出しながら、充電時はこのインピーダンス変調用コンデンサー５３を切り離し電力効率を高くして内蔵電池５２を効率よく充電できる特徴がある。エコー信号を発生できるのは、受電コイル５１の位置を検出する状態においては、受電コイル５１と並列にインピーダンス変調用コンデンサー５３を接続するからである。また、電力効率を高くして、内蔵電池５２を効率よく充電できるのは、内蔵電池５２を充電する状態にあっては、受電コイル５１と並列にコンデンサーを接続することなく、受電コイル５１と直列にコンデンサーを接続して、受電コイル５１の電力を整流回路５３に出力できるからである。受電コイル５１に直列コンデンサー５５を接続する回路構成は、受電コイルに並列コンデンサーを接続している伝送電流の少ない回路構成より電力効率を向上して充電中のコイルや電池の発熱を抑え、内蔵電池５２を効率よく速やかに、しかも安全に充電できる。 The battery built-in device 50 and the charging stand 10 constitute a parallel resonance circuit 5457 at all times to accurately detect the position of the power receiving coil 51, and at the time of charging, the impedance modulation capacitor 53 is disconnected to increase power efficiency. The built-in battery 52 can be efficiently charged. The echo signal can be generated because the impedance modulation capacitor 53 is connected in parallel with the power receiving coil 51 in a state where the position of the power receiving coil 51 is detected. The reason why the internal battery 52 can be efficiently charged by increasing the power efficiency is that the internal battery 52 is charged in series with the power receiving coil 51 without connecting a capacitor in parallel with the power receiving coil 51. This is because the power of the power receiving coil 51 can be output to the rectifier circuit 53 by connecting a capacitor to the capacitor. The circuit configuration in which the series capacitor 55 is connected to the power receiving coil 51 improves the power efficiency and suppresses the heat generation of the coil and the battery during charging, compared with the circuit configuration with a small transmission current connected to the power receiving coil, and the built-in battery 52 can be charged efficiently, promptly and safely.
　以上の位置検出制御器１４は、受電コイル５１と並列に接続されるインピーダンス変調用コンデンサー５３と、このインピーダンス変調用コンデンサー５３を受電コイル５１に接続するスイッチング素子６４と、このスイッチング素子６４のオンオフを制御する制御回路１６５とを備えており、受電コイル５１の位置を検出するときにスイッチング素子１６４をオンに切り換える。この回路構成の電池内蔵機器５０は、位置検出制御器１４として設けているインピーダンス変調用コンデンサー１６３とスイッチング素子１６４と制御回路１６５と使用して、電池情報を伝送することができる。それは、制御回路１６５でもって電池情報のデジタル信号でスイッチング素子１６４をオンオフに切り換えて、受電コイル５１のインピーダンス負荷を変更できるからである。したがって、この電池内蔵機器５０は、電池情報を伝送するために専用の回路を設けることなく、すなわち同じハードウェアでもって、制御回路６５がスイッチング素子６４をオンオフに切り換えるソフトウェアのみを変更して電池情報を伝送することができる。ソフトウェアは制御回路１６５に設けているメモリに記憶することができる。このため、この電池内蔵機器５０は、製造コストを高くすることなく、理想的な状態で電池情報を充電台１０に伝送できる。 The position detection controller 14 described above includes an impedance modulation capacitor 53 connected in parallel to the power receiving coil 51, a switching element 64 connecting the impedance modulation capacitor 53 to the power receiving coil 51, and turning on / off the switching element 64. And a control circuit 165 for controlling the switching element 164 to be turned on when the position of the power receiving coil 51 is detected. The battery built-in device 50 having this circuit configuration can transmit battery information using the impedance modulation capacitor 163, the switching element 164, and the control circuit 165 provided as the position detection controller 14. This is because the impedance load of the power receiving coil 51 can be changed by switching the switching element 164 on and off with a digital signal of battery information by the control circuit 165. Therefore, the battery built-in device 50 does not have a dedicated circuit for transmitting battery information, that is, with the same hardware, only the software for the control circuit 65 to switch the switching element 64 on and off is changed. Can be transmitted. The software can be stored in a memory provided in the control circuit 165. For this reason, this battery built-in apparatus 50 can transmit battery information to the charging stand 10 in an ideal state without increasing the manufacturing cost.
 以下に、本実施例における金属製の異物の検出について説明する。
　無接点充電においては、送電コイルと受電コイルとの間に、或いは送電コイル上に、金属製（又は導電性）の異物（例えば、文房具の金属製クリップ、金属製板状ものさし等）が介在すると、送電コイルからの送電よる磁力線等による電磁誘導作用により、金属製の異物に渦電流に相当する電流が流れて、高温となる弊害がある。また、金属製（導電性）の異物だけでなく、絶縁材料の異物（例えば、プラスチック製の板状ものさし等）が介在しても、上面プレート２１と電池内蔵機器５０下面との間に、空間ができるために、伝送効率が低下する弊害がある。このような伝送効率の低下を検出することにより、金属製（又は導電性）、絶縁性の異物を検出することができる。
　本実施例においては、上面プレート２１上に金属異物が置かれると、大きなものであれば、上述のように、エコー信号の波形とは異なる波形が検出、識別されるときは、電池内蔵機器５０の受電コイル５１以外（例えば、金属異物）のものが搭載されたとして、電力供給を停止することができる。また、上面プレート２１上に金属異物が置かれると、小さなものであれば、上述のように、電池のシリアル番号等の認証信号（＝ＩＤ信号）を、充電台１０が受信することができないので、受電コイル５１以外（例えば、金属異物）のものが搭載されたとして、電力供給を停止することができる。 Below, the detection of the metal foreign material in a present Example is demonstrated.
In non-contact charging, when a metal (or conductive) foreign material (for example, a metal clip of a stationery, a metal plate-shaped ruler, etc.) is interposed between the power transmission coil and the power reception coil or on the power transmission coil. Due to electromagnetic induction caused by magnetic lines of force transmitted from the power transmission coil, a current corresponding to eddy current flows through the metal foreign object, resulting in a high temperature. In addition, not only metallic (conductive) foreign matter but also insulating foreign matter (for example, a plastic plate ruler) is interposed between the upper plate 21 and the lower surface of the battery built-in device 50. Therefore, there is a detrimental effect on transmission efficiency. By detecting such a decrease in transmission efficiency, metallic (or conductive) and insulating foreign matters can be detected.
In the present embodiment, when a metal foreign object is placed on the upper surface plate 21, if a large foreign object is detected and a waveform different from the waveform of the echo signal is detected and identified as described above, the battery built-in device 50 is detected. The power supply can be stopped assuming that a coil other than the power receiving coil 51 (for example, a metal foreign object) is mounted. Further, when a metal foreign object is placed on the top plate 21, if it is small, the charging stand 10 cannot receive an authentication signal (= ID signal) such as a battery serial number as described above. Assuming that something other than the power receiving coil 51 (for example, a metal foreign object) is mounted, the power supply can be stopped.
　この充電台１０は、以下の動作で電池内蔵機器５０の内蔵電池５２を充電する。
（１）ケース２０の上面プレート２１に電池内蔵機器５０が載せられると、この電池内蔵機器５０の位置が、位置検出コイル３０を利用して、位置検出制御器１４で検出される。
（２）電池内蔵機器５０の位置を検出した位置検出制御器１４は、移動機構１３を制御して、移動機構１３でもって送電コイル１１を上面プレート２１に沿って移動させて電池内蔵機器５０の受電コイル５１に接近させる。
（３）受電コイル５１に接近する送電コイル１１は、受電コイル５１に電磁結合されて受電コイル５１に交流電力を搬送する。
（４）電池内蔵機器５０は、受電コイル５１の交流電力を整流して直流に変換し、この直流で内蔵電池５２を充電する。 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 using the position detection coil 30.
(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 transmission coil 11 along the upper surface plate 21 with the moving mechanism 13, thereby Approach the power receiving coil 51.
(3) The power transmission coil 11 approaching the power reception coil 51 is electromagnetically coupled to the power reception coil 51 and carries AC power to the power reception coil 51.
(4) The battery built-in device 50 rectifies the AC power of the power receiving coil 51 and converts it into direct current, and charges the built-in battery 52 with this direct current.
　そして、上述のように、伝送効率検出部８４において、充電電力／入力電力の比率から伝送効率を検出する。送電コイル１１上に、正確に、受電コイル５１が位置あわせされているので、伝送効率が良好で、安定している。通常であれば、６０～６５％の伝送効率を、得ることができる。
　充電開始時、或いは、充電中に、伝送効率検出部８４から出力される伝送効率が、所定値（例えば、５０％）以下であるかが、制御回路８０の演算部８５でもって、演算、判定される。このような所定値としては、４０～６０％の値が利用できる。
所定値以下であれば、金属製異物が、送電コイル１１と受電コイルの間、本実施例においては、上面プレート２１上と電池内蔵機器５０下面との間に、金属製異物が介在したとして、制御回路８０の演算部８５からの停止信号により、
出力電力調整回路８２が入力回路９３を介してスイッチング素子９２をオフにして、充電を停止する。
　これに代わって、伝送効率が、所定の変化率（６５％から５０％変化したときは、５０／６０＝０．８３）以下となれば、金属製異物の介在と判定することができる。このような伝送効率の変化率については、初期値とその後の値とのの変化、又は、所定時間間隔で伝送効率の変化等が利用できる。
　また、これらに代わって、伝送効率が、所定値以上低下したとき（６５％から５０％に低下したとき、１５％の低下となる）、金属製異物の介在と判定することができる。このような所定値は１０～２０％の値が利用できる。このような伝送効率の低下については、初期値とその後の値とのの比較、又は、所定時間間隔で伝送効率の比較等が利用できる。
　以上のような所定値については、制御回路８０内に保存されているが、使用する電池内蔵機器５０の電池情報検出回路５９内に、固有の所定値を保存しておいて、これを、電池情報として、制御回路８０内に、伝送することもできる。 Then, as described above, the transmission efficiency detection unit 84 detects the transmission efficiency from the ratio of charging power / input power. Since the power receiving coil 51 is accurately aligned on the power transmission coil 11, the transmission efficiency is good and stable. Normally, transmission efficiency of 60 to 65% can be obtained.
Whether the transmission efficiency output from the transmission efficiency detection unit 84 is less than a predetermined value (for example, 50%) at the start of charging or during charging is calculated and determined by the calculation unit 85 of the control circuit 80. Is done. A value of 40 to 60% can be used as such a predetermined value.
If it is less than or equal to the predetermined value, it is assumed that the metal foreign matter is interposed between the power transmission coil 11 and the power receiving coil, and in this embodiment, the metal foreign matter is interposed between the upper surface plate 21 and the lower surface of the battery built-in device 50. By a stop signal from the calculation unit 85 of the control circuit 80,
The output power adjustment circuit 82 turns off the switching element 92 via the input circuit 93 and stops charging.
Instead, if the transmission efficiency is equal to or less than a predetermined rate of change (50/60 = 0.83 when changed from 65% to 50%), it can be determined that metal foreign matter is present. For such a change rate of transmission efficiency, a change between an initial value and a subsequent value, or a change in transmission efficiency at a predetermined time interval can be used.
In place of these, when the transmission efficiency decreases by a predetermined value or more (when the transmission efficiency decreases from 65% to 50%, it decreases by 15%), it can be determined that metal foreign matter is present. A value of 10 to 20% can be used as such a predetermined value. For such a decrease in transmission efficiency, a comparison between an initial value and a subsequent value, a comparison of transmission efficiency at a predetermined time interval, or the like can be used.
The predetermined value as described above is stored in the control circuit 80. However, a specific predetermined value is stored in the battery information detection circuit 59 of the battery built-in device 50 to be used, and this is used as the battery. Information can also be transmitted in the control circuit 80.
　なお、衝撃等により、充電台１０上の位置から、電池内蔵機器５０の位置がずれたときは、上述のように周期的に伝送される電池情報が、受信コイル５１、送電コイル１１を介して、充電台１０の検出回路１７で受信されることがなくなるので、制御回路８０の演算部８５が電池情報がないことを判定して、再度、上述のように位置検出制御器１４にて、上面プレート２１に載せられた電池内蔵機器５０の位置を検出し、送電コイル１１を、受電コイル５１に接近、正確な位置に、移動させ、充電を行う。
　このように、本実施例では、充電台１０上の位置から、電池内蔵機器５０の位置がずれた場合であっても、再度、送電コイル１１を、受電コイル５１に接近、正確な位置に、移動させ、充電を行うことができるので、この位置においても、伝送効率が良好で、安定していることより、伝送効率より、異物の存在を判定することができる。 When the position of the battery built-in device 50 is shifted from the position on the charging stand 10 due to an impact or the like, the battery information periodically transmitted as described above is transmitted via the reception coil 51 and the power transmission coil 11. Since the detection circuit 17 of the charging base 10 is not received, the calculation unit 85 of the control circuit 80 determines that there is no battery information, and the position detection controller 14 again performs the upper surface detection as described above. The position of the battery built-in device 50 placed on the plate 21 is detected, the power transmission coil 11 is moved closer to the power reception coil 51 and moved to an accurate position, and charging is performed.
As described above, in this embodiment, even when the position of the battery built-in device 50 is shifted from the position on the charging base 10, the power transmission coil 11 is again approached to the power reception coil 51 and is accurately positioned. Since it can be moved and charged, even at this position, the transmission efficiency is good and stable, so the presence of a foreign object can be determined from the transmission efficiency.
　複数の電池内蔵機器５０を載せることができる上面プレート２１の充電台１０は、複数の電池内蔵機器５０の電池５２を順番に切り換えて満充電する。この充電台１０は、最初にいずれかの電池内蔵機器５０の受電コイル５１の位置を検出して、この受電コイル５１に送電コイル１１を接近させて、この電池内蔵機器５０の電池５２を満充電する。この電池内蔵機器５０の電池５２が満充電されて、満充電検出回路１７が満充電信号を受信すると、位置検出制御器１４は、この電池内蔵機器５０とは別の位置にセットされる第２の電池内蔵機器５０の受電コイル５１の位置を検出し、移動機構１３を制御して送電コイル１１を第２の電池内蔵機器５０の受電コイル５１に接近させる。この状態で、第２の電池内蔵機器５０の電池５２に電力搬送して、この電池５２を満充電する。さらに、第２の電池内蔵機器５０の電池５２が満充電されて、第２の電池内蔵機器５０からの満充電信号を満充電検出回路１７が受信すると、位置検出制御器１４が、さらに第３の電池内蔵機器５０の受電コイル５１を検出して、移動機構１３を制御して第３の電池内蔵機器５０の受電コイル５１に送電コイル１１を接近させて、この電池内蔵機器５０の電池５２を満充電する。以上のように、複数の電池内蔵機器５０が上面プレート２１にセットされると、次々と電池内蔵機器５０を切り換えて内蔵電池５２を満充電する。この充電台１０は、満充電された電池内蔵機器５０の位置を記憶して、満充電された電池内蔵機器５０の電池５２を充電しない。上面プレート２１の上にセットされる全ての電池内蔵機器５０の電池５２を満充電したことを検出すると、充電台１０は、交流電源１２の動作を停止して電池５２の充電を停止する。ここで、上記の実施例では、電池内蔵機器５０の電池５２が満充電されると充電を停止しているが、電池５２が所定容量となったときを満充電として充電を停止してもよい。 The charging stand 10 on the upper surface plate 21 on which a plurality of battery built-in devices 50 can be placed is fully charged by sequentially switching the batteries 52 of the plurality of battery built-in devices 50. The charging stand 10 first detects the position of the power receiving coil 51 of any of the battery built-in devices 50, makes the power transmitting coil 11 approach the power receiving coil 51, and fully charges the battery 52 of the battery built-in device 50. To do. When the battery 52 of the battery built-in device 50 is fully charged and the full charge detection circuit 17 receives the full charge signal, the position detection controller 14 is set to a second position different from the battery built-in device 50. The position of the power receiving coil 51 of the battery built-in device 50 is detected, and the moving mechanism 13 is controlled to bring the power transmitting coil 11 closer to the power receiving coil 51 of the second battery built-in device 50. In this state, power is transferred to the battery 52 of the second battery-equipped device 50, and the battery 52 is fully charged. Further, when the battery 52 of the second battery built-in device 50 is fully charged and the full charge detection circuit 17 receives the full charge signal from the second battery built-in device 50, the position detection controller 14 further performs the third operation. The power receiving coil 51 of the battery built-in device 50 is detected, the moving mechanism 13 is controlled to bring the power transmission coil 11 close to the power receiving coil 51 of the third battery built-in device 50, and the battery 52 of the battery built-in device 50 is moved. Fully charge. As described above, when the plurality of battery built-in devices 50 are set on the top 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. When it is detected that the batteries 52 of all the battery built-in devices 50 set on the upper surface plate 21 are fully charged, the charging stand 10 stops the operation of the AC power supply 12 and stops the charging of the batteries 52. Here, in the above embodiment, the charging is stopped when the battery 52 of the battery built-in device 50 is fully charged. However, the charging may be stopped when the battery 52 reaches a predetermined capacity. .
　以上の移動機構１３は、送電コイル１１をＸ軸方向とＹ軸方向とに移動して、送電コイル１１を受電コイル５１に最も近い位置に移動させるが、本発明は、移動機構がＸ軸方向とＹ軸方向とに送電コイルを移動して、送電コイルの位置を受電コイルに接近させる構造には特定せず、送電コイルは種々の方向に移動させて、受電コイルに接近することもできる。 The above moving mechanism 13 moves the power transmission coil 11 in the X-axis direction and the Y-axis direction to move the power transmission coil 11 to a position closest to the power receiving coil 51. In the present invention, the movement mechanism is in the X-axis direction. The power transmission coil is moved in the Y-axis direction and the position of the power transmission coil is not specified as a structure for approaching the power reception coil, and the power transmission coil can be moved in various directions to approach the power reception coil.
　本発明に係る充電台は、携帯電話や携帯音楽プレーヤ等の充電の他、アシスト自転車や電気自動車の充電等にも好適に利用できる。 The charging stand according to the present invention can be suitably used not only for charging a mobile phone or a portable music player but also for charging an assist bicycle or an electric vehicle.
　１０…充電台
　１１…送電コイル
　１２…交流電源
　１３…移動機構
　１４…位置検出制御器
　１５…コア　　　　　　　　　　１５Ａ…円柱部
　　　　　　　　　　　　　　　　１５Ｂ…円筒部
　１６…リード線
　１７…検出回路
　２０…ケース
　２１…上面プレート
　２２…サーボモータ　　　　　　２２Ａ…Ｘ軸サーボモータ
　　　　　　　　　　　　　　　　２２Ｂ…Ｙ軸サーボモータ
　２３…ネジ棒　　　　　　　　　２３Ａ…Ｘ軸ネジ棒
　　　　　　　　　　　　　　　　２３Ｂ…Ｙ軸ネジ棒
　２４…ナット材　　　　　　　　２４Ａ…Ｘ軸ナット材
　　　　　　　　　　　　　　　　２４Ｂ…Ｙ軸ナット材
　２５…ベルト
　２６…ガイドロッド
　２７…ガイド部
　３０…位置検出コイル　　　　　３０Ａ…Ｘ軸位置検出コイル
　　　　　　　　　　　　　　　　３０Ｂ…Ｙ軸位置検出コイル
　３１…検出パルス発生回路
　３２…受信回路
　３３…識別回路
　３４…切換回路
　３５…リミッター回路
　３６…Ａ／Ｄコンバータ
　５０…電池内蔵機器
　５１…受電コイル
　５２…電池
　５３…コンデンサー
　５４…並列共振回路
　５５…ダイオード
　５６…平滑コンデンサー
　５７…整流回路
　５８…充電制御回路
　５９…送信部
　６４…位置検出制御器
　７３…識別回路
　７７…記憶回路
　８０…制御回路
　８１…周波数調整回路
　８２…出力電力調整回路
　８３…充電電力検出部
　８４…伝送効率検出部
　８５…演算部
　８７…入力電力検出部
　８９…受信部
　９０…整流回路
　９１…ＤＣ／ＡＣインバータ
　９２…スイッチング素子
　９３…入力回路
　９９…商用電源
　１３０…位置検出コイル　　　　１３０Ａ…Ｘ軸位置検出コイル
　１５１…受電コイル
　１５５…直列コンデンサー
　１６１…変調回路
　１６４…スイッチング素子
　１６２…負荷回路
　１６５…制御回路
 
  DESCRIPTION OF SYMBOLS 10 ... Charging stand 11 ... Power transmission coil 12 ... AC power supply 13 ... Movement mechanism 14 ... Position detection controller 15 ... Core 15A ... Cylindrical part 15B ... Cylindrical part 16 ... Lead wire 17 ... Detection circuit 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 position detection coil 30B ... Y-axis position detection coil 31 ... detection pulse generation circuit 32 ... reception circuit 33 ... identification circuit 34 ... switching circuit 35 ... limiter circuit 36 ... A / D converter 50 ... Electric Built-in device 51 ... Receiving coil 52 ... Battery 53 ... Condenser 54 ... Parallel resonance circuit 55 ... Diode 56 ... Smoothing capacitor 57 ... Rectifier circuit 58 ... Charge control circuit 59 ... Transmission unit 64 ... Position detection controller 73 ... Identification circuit 77 ... Memory Circuit 80 ... Control circuit 81 ... Frequency adjustment circuit 82 ... Output power adjustment circuit 83 ... Charge power detection unit 84 ... Transmission efficiency detection unit 85 ... Calculation unit 87 ... Input power detection unit 89 ... Reception unit 90 ... Rectification circuit 91 ... DC / AC inverter 92 ... switching element 93 ... input circuit 99 ... commercial power supply 130 ... position detection coil 130A ... X-axis position detection coil 151 ... power receiving coil 155 ... series capacitor 161 ... modulation circuit 164 ... switching element 162 ... load circuit 165 ... control circuit

Claims (12)

  1. 　受電コイル(51)に電力搬送される電力で充電される電池(52)を内蔵する電池内蔵機器(50)の充電台であって、
    　交流電源(12)に接続されて前記受電コイル(51)に起電力を電力搬送する送電コイル(11)を備える充電台であって、
    　前記交流電源(12)が、電池内蔵機器(50)に電力搬送する伝送効率を検出する伝送効率検出部(84)を有する制御回路(80)を備え、
    　前記制御回路(80)において、伝送効率検出部(84)で検出される伝送効率より、充電台と電池内蔵機器(50)との間に異物が存在するかを判定することを特徴とする充電台。     A charging stand for a battery built-in device (50) including a battery (52) to be charged with power conveyed to a power receiving coil (51),
    A charging stand comprising a power transmission coil (11) connected to an AC power source (12) and carrying an electromotive force to the power reception coil (51),
    The AC power supply (12) includes a control circuit (80) having a transmission efficiency detection unit (84) for detecting transmission efficiency for conveying power to the battery built-in device (50),
    Charging characterized in that, in the control circuit (80), it is determined from the transmission efficiency detected by the transmission efficiency detector (84) whether a foreign object exists between the charging base and the battery built-in device (50). Stand.
  2. 　前記充電台において、送電コイル(11)を内蔵すると共に、上面には電池内蔵機器(50)を載せる上面プレート(21)を有するケース(20)と、このケース(20)に内蔵されて、前記送電コイル(11)を上面プレート(21)の内面に沿って移動させる移動機構(13)と、上面プレート(21)に載せられる電池内蔵機器(50)の受電コイル(51)の位置を検出して前記移動機構(13)を制御して前記送電コイル(11)を前記受電コイル(51)に接近させる位置検出制御器(14;64)とを備え、
    　前記位置検出制御器(14;64)が、上面プレート(21)の裏側に所定の間隔で配置している複数の位置検出コイル(30)と、位置検出コイル(30)に位置検出信号としてパルス信号を供給する検出パルス発生回路(31)と、この検出パルス発生回路(31)から位置検出コイル(30)に供給されるパルス信号に励起されて受電コイル(51)から位置検出コイル(30)に誘導されるエコー信号を受信する受信回路(32)と、この受信回路(32)が受信するエコー信号から受電コイル(51)の位置を判別する識別回路(33)とを備え、
    る請求項１に記載される充電台     In the charging stand, a power transmission coil (11) is incorporated, and a case (20) having an upper surface plate (21) on which the battery built-in device (50) is placed on the upper surface, and the case (20), It detects the position of the moving mechanism (13) that moves the power transmission coil (11) along the inner surface of the top plate (21) and the power receiving coil (51) of the battery built-in device (50) that is placed on the top plate (21). A position detection controller (14; 64) for controlling the moving mechanism (13) and causing the power transmission coil (11) to approach the power reception coil (51),
    The position detection controller (14; 64) has a plurality of position detection coils (30) arranged at predetermined intervals on the back side of the upper surface plate (21), and pulses as position detection signals to the position detection coil (30). A detection pulse generator circuit (31) for supplying a signal, and a pulse signal supplied from the detection pulse generator circuit (31) to the position detection coil (30) and excited by a pulse signal supplied from the power reception coil (51) to the position detection coil (30) Receiving circuit (32) for receiving the echo signal induced in the, and an identification circuit (33) for determining the position of the receiving coil (51) from the echo signal received by the receiving circuit (32),
    The charging stand according to claim 1
  3. 　前記制御回路(80)において、前記伝送効率が所定値以下のとき、伝送効率が所定値以上低下したとき、又は、伝送効率の変化率が所定値以下となったとき、充電台と電池内蔵機器(50)との間に異物が存在していると判定する請求項１に記載される充電台。 In the control circuit (80), when the transmission efficiency is equal to or lower than a predetermined value, when the transmission efficiency is lower than a predetermined value, or when the rate of change of the transmission efficiency is equal to or lower than a predetermined value, the charging stand and the battery built-in device The charging stand according to claim 1, wherein it is determined that there is a foreign object between (50) and (50).
  4. 　前記位置検出コイル(30)が、隣接して配設してなる位置検出コイル(30)の一部を隣の位置検出コイル(30)に重ねて配設しており、
    　前記識別回路(33)は、最大レベルのエコー信号が誘導される位置検出コイル(30)と、その両側に配設している位置検出コイル(30)のエコー信号のレベルから受電コイル(51)の位置を判別することを特徴とする請求項２に記載される充電台。     The position detection coil (30) is disposed so as to overlap a part of the position detection coil (30) adjacent to the position detection coil (30),
    The identification circuit (33) includes a position detection coil (30) from which an echo signal of the maximum level is induced, and a receiving coil (51) from the level of the echo signal of the position detection coil (30) disposed on both sides thereof. The charging stand according to claim 2, wherein the position is determined.
  5. 　前記位置検出コイル(30)が直線部を有する細長いコイルであって、隣接する位置検出コイル(30)が、コイルの長手方向に直交する方向に位置ずれして配置され、
    　互いに重なるように隣接してなる位置検出コイル(30)同士の重なり量（ｄ）が、細長いコイルの横幅（Ｗ）の１／２ないし９／１０である請求項３に記載される充電台。     The position detection coil (30) is an elongated coil having a straight portion, and the adjacent position detection coil (30) is arranged in a position shifted in a direction orthogonal to the longitudinal direction of the coil,
    The charging stand according to claim 3, wherein the overlapping amount (d) of the position detection coils (30) adjacent to each other so as to overlap each other is 1/2 to 9/10 of the lateral width (W) of the elongated coil.
  6. 　前記位置検出コイル(30)が、互いに重なるように隣接してなる位置検出コイル(30)同士の重なり量（ｄ）を、細長いコイルの横幅（Ｗ）の２／３としてなる請求項５に記載される充電台。 The overlap amount (d) between the position detection coils (30) adjacent to each other so that the position detection coils (30) overlap with each other is set to 2/3 of the lateral width (W) of the elongated coil. Charging stand.
  7. 　前記位置検出コイル(30)が、受電コイル(51)のＸ軸方向の位置を検出する複数のＸ軸位置検出コイル(30A)と、Ｙ軸方向の位置を検出する複数のＹ軸位置検出コイル(30B)とを備える請求項２、４ないし６のいずれかに記載される充電台。 The position detection coil (30) has a plurality of X-axis position detection coils (30A) for detecting the position of the power receiving coil (51) in the X-axis direction, and a plurality of Y-axis position detection coils for detecting a position in the Y-axis direction. (30B) The charging stand as described in any one of Claim 2, 4 thru | or 6.
  8. 　前記Ｘ軸位置検出コイル(30A)はＹ軸方向に細長いコイルで、Ｙ軸位置検出コイル(30B)はＸ軸方向に細長いコイルである請求項７に記載される充電台。 The charging stand according to claim 7, wherein the X-axis position detection coil (30A) is a coil elongated in the Y-axis direction, and the Y-axis position detection coil (30B) is a coil elongated in the X-axis direction.
  9. 　前記伝送効率検出部(84)が、交流電源(12)の消費電力又は消費する電流値、電圧値を掛け算した値と、電池内蔵機器(50)の電池(52)を充電する充電電力又は電流と電圧の掛け算した値とを検出して、消費電力に対する充電電力の比率から伝送効率を検出する請求項１に記載される充電台。 The transmission efficiency detection unit (84) is a value obtained by multiplying the power consumption or current value consumed by the AC power supply (12), the voltage value, and the charging power or current charging the battery (52) of the battery built-in device (50). The charging stand according to claim 1, wherein a transmission efficiency is detected from a ratio of charging power to power consumption by detecting a value obtained by multiplying a voltage and a voltage.
  10. 　電池情報を、周期的に受信コイル(51)、送電コイル(11)を介して、受信する充電台であって、電池情報の周期的な受信がなくなったとき、上面プレート(21)に載せられる電池内蔵機器(50)がずれたとして、再度、前記位置検出制御器(14;64)にて、上面プレート(21)に載せられる電池内蔵機器(50)の受電コイル(51)の位置を検出して前記移動機構(13)を制御して前記送電コイル(11)を前記受電コイル(51)に接近させる請求項２に記載される充電台。 A charging base that periodically receives battery information via the receiving coil (51) and the power transmission coil (11). When the battery information is not received periodically, the charging information is placed on the upper plate (21). If the battery built-in device (50) is displaced, the position detection controller (14; 64) again detects the position of the power receiving coil (51) of the battery built-in device (50) placed on the top plate (21). The charging stand according to claim 2, wherein the moving mechanism (13) is controlled to bring the power transmission coil (11) closer to the power receiving coil (51).
  11. 　前記電池内蔵機器(50)内に、伝送効率の所定値が保存され、この伝送効率の所定値を前記制御回路(80)に、伝送する請求項３に記載される充電台。 The charging stand according to claim 3, wherein a predetermined value of transmission efficiency is stored in the battery built-in device (50), and the predetermined value of transmission efficiency is transmitted to the control circuit (80).
  12. 　前記制御回路(80)において、前記伝送効率を所定値に比較して、充電台と電池内蔵機器(50)との間に異物が存在するかを判定し、充電を停止する請求項１に記載される充電台。
     
          The control circuit (80) compares the transmission efficiency with a predetermined value to determine whether there is a foreign object between the charging base and the battery built-in device (50), and stops charging. Charging stand.

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