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WO2012173128A1 - Station de chargement - Google Patents

Station de chargement 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
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2012/065067
Other languages
English (en)
Japanese (ja)
Inventor
恭三 寺尾
遠矢　正一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of WO2012173128A1 publication Critical patent/WO2012173128A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H02J7/47—
    • 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

Landscapes

  • 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

L'objectif est de fournir une station de chargement apte à détecter des métaux et d'autres objets étrangers. Une station de chargement comprend un mécanisme de déplacement (13) destiné à déplacer une bobine d'émission d'énergie électrique (11) le long d'une surface intérieure d'une plaque supérieure (21) et un dispositif de commande de détection de position (14, 64) destiné à détecter la position d'une bobine de réception d'énergie électrique (51) d'un dispositif (50) à élément accumulateur intégré qui est placé sur la plaque supérieure (21) et à commander le mécanisme de déplacement (13) pour amener la bobine d'émission d'énergie électrique (11) à proximité de la bobine de réception d'énergie électrique (51). Un circuit de commande (80) est prévu, lequel comporte une unité de détection de l'efficacité du transfert (84) destinée à détecter l'efficacité à l'aide de laquelle une alimentation électrique alternative (12) émet de l'énergie électrique vers le dispositif (50) à élément accumulateur intégré. À partir de l'efficacité du transfert détectée par le détecteur de l'efficacité du transfert (84), le circuit de commande (80) détermine si un objet étranger est présent entre la station de chargement et le dispositif (50) à élément accumulateur intégré.
PCT/JP2012/065067 2011-06-17 2012-06-13 Station de chargement Ceased WO2012173128A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011135799 2011-06-17
JP2011-135799 2011-06-17

Publications (1)

Publication Number Publication Date
WO2012173128A1 true WO2012173128A1 (fr) 2012-12-20

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PCT/JP2012/065067 Ceased WO2012173128A1 (fr) 2011-06-17 2012-06-13 Station de chargement

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WO (1) WO2012173128A1 (fr)

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WO2014129181A1 (fr) * 2013-02-19 2014-08-28 パナソニック株式会社 Dispositif de détection de corps étrangers, procédé de détection de corps étrangers et système de charge sans contact
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CN109256872A (zh) * 2017-07-13 2019-01-22 丰田自动车株式会社 送电装置和送电系统
US10298049B2 (en) 2015-10-05 2019-05-21 Witricity Corporation Systems, methods, and apparatus for detecting metallic objects in a predetermined space via inductive kinematic sensing
WO2023248733A1 (fr) 2022-06-20 2023-12-28 パナソニックＩｐマネジメント株式会社 Dispositif de charge

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WO2014129181A1 (fr) * 2013-02-19 2014-08-28 パナソニック株式会社 Dispositif de détection de corps étrangers, procédé de détection de corps étrangers et système de charge sans contact
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CN105075062B (zh) * 2013-02-19 2017-11-14 松下知识产权经营株式会社 异物检测装置、异物检测方法以及非接触充电系统
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CN109256872A (zh) * 2017-07-13 2019-01-22 丰田自动车株式会社 送电装置和送电系统
CN109256872B (zh) * 2017-07-13 2022-04-12 丰田自动车株式会社 送电装置和送电系统
WO2023248733A1 (fr) 2022-06-20 2023-12-28 パナソニックＩｐマネジメント株式会社 Dispositif de charge

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