WO2013061615A1 - Dispositif de transmission d'énergie sans contact et dispositif d'alimentation en énergie ainsi que dispositif de réception d'énergie utilisés dans celui-ci - Google Patents

Dispositif de transmission d'énergie sans contact et dispositif d'alimentation en énergie ainsi que dispositif de réception d'énergie utilisés dans celui-ci Download PDF

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Publication number
WO2013061615A1
WO2013061615A1 PCT/JP2012/006930 JP2012006930W WO2013061615A1 WO 2013061615 A1 WO2013061615 A1 WO 2013061615A1 JP 2012006930 W JP2012006930 W JP 2012006930W WO 2013061615 A1 WO2013061615 A1 WO 2013061615A1
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Prior art keywords
detection electrode
power transmission
cover
transmission device
electrode
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PCT/JP2012/006930
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English (en)
Japanese (ja)
Inventor
秀樹 定方
藤田　篤志
大森　義治
芳弘 阪本
柏本　隆
裕明 栗原
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パナソニック株式会社
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Publication of WO2013061615A1 publication Critical patent/WO2013061615A1/fr

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    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • 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
    • B60L53/36—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles by positioning the vehicle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • 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
    • B60L2200/26—Rail vehicles
    • 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
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • 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
    • B60L2210/00—Converter types
    • B60L2210/40—DC to AC converters
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/36—Temperature of vehicle components or parts
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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 contactless power transmission device suitable for contactless power transmission, and more particularly to a contactless power transmission device used for charging an electric propulsion vehicle such as an electric vehicle or a plug-in hybrid vehicle.
  • FIG. 15 is a diagram showing the configuration of the non-contact power transmission device and the periphery of the device disclosed in Patent Document 1.
  • the non-contact power transmission device 106 includes a power feeding device (primary side) F connected to a power panel of a ground-side power source 109, and a power receiving device (secondary side) G mounted on an electric vehicle or train. It has. And at the time of electric power feeding, the electric power feeder F and the receiving device G are arrange
  • the power receiving device G is connected to, for example, the in-vehicle battery 110, and the power transmitted from the power feeding device F to the power receiving device G is charged in the in-vehicle battery 110.
  • the in-vehicle motor 111 is driven by the electric power stored in the in-vehicle battery 110.
  • the wireless communication device 112 performs necessary information exchange between the power feeding device F and the power receiving device G during the process related to the non-contact power feeding.
  • FIG. 16 is a cross-sectional view of the power feeding device F (power receiving device G) of FIG.
  • FIG. 16A is a plan cross-sectional view of the power feeding device F (power receiving device G)
  • FIG. 16B is a side cross-sectional view of the power feeding device F (power receiving device G).
  • the power feeding device F includes a primary coil 107, a primary magnetic core 113, a back plate 115, and a cover 116.
  • the power receiving device G includes a secondary coil 108, a secondary magnetic core 114, a back plate 115, and a cover 116.
  • the surfaces of the primary coil 107 and the primary magnetic core 113 of the power feeding device F and the surfaces of the secondary coil 108 and the secondary magnetic core 114 of the power receiving device G are covered and fixed by a mold resin 117 mixed with a foam material 118. ing.
  • the mold resin 117 is filled between the back plate 115 and the cover 116 of the power feeding device F (power receiving device G), and the primary coil 107 (secondary coil 108) and the primary magnetic core 113 (secondary magnetic core) inside.
  • the surface of the core 114) is covered and fixed by a mold resin 117.
  • the mold resin 117 is made of, for example, silicon resin, and is fixed as described above, thereby fixing the position of the primary coil 107 (secondary coil 108), ensuring its mechanical strength and exhibiting a heat dissipation function.
  • the primary coil 107 (secondary coil 108) generates heat due to Joule heat through an exciting current, but is radiated and cooled by heat conduction of the mold resin 117.
  • a sensor for detecting a foreign matter that has entered between the power feeding device and the power receiving device is provided.
  • a temperature sensor for detecting overheating of a metal foreign object is used.
  • a capacitance sensor is applied to a sensor that detects foreign matter, it is necessary to provide an electrode of the capacitance sensor.
  • FIG. 17 is a diagram showing an example of the heat generation amount W of the detection electrode with respect to the intensity of the magnetic flux density ⁇ interlinked with the detection electrode. More specifically, an example of the heat generation amount W of the detection electrode pattern with respect to the intensity of the magnetic flux density ⁇ interlinking with the detection electrode pattern of 10 mm ⁇ 10 mm is shown. As shown in FIG. 17, the heat generation amount W increases as the magnetic flux density ⁇ increases. If the electrodes are overheated by the interlinkage magnetic flux in this way and the temperature is excessively increased, there is a possibility that the power feeding device or the power receiving device may be damaged such as a failure. Moreover, it is conceivable that the eddy current caused by the magnetic flux generated from the primary coil is generated in the electrode, thereby lowering the power supply efficiency.
  • the present invention can reliably detect the intrusion of foreign matter around the cover of the power feeding device and the power receiving device, particularly between the power feeding device (primary coil) and the power receiving device (secondary coil).
  • An object of the present invention is to provide a contactless power transmission device with high safety.
  • the non-contact power transmission device performs power transmission using electromagnetic induction between the power feeding device and the power receiving device.
  • the power supply apparatus includes a primary coil that generates magnetic flux, a cover that covers the primary coil, and a detection electrode that is provided between the primary coil and the cover, A capacitance sensor that detects foreign matter around the cover based on the detected change in capacitance, and a shield electrode that is interposed between the detection electrode and the primary coil;
  • a flow path blocking unit is provided to block a flow path of eddy current generated by the magnetic flux.
  • the non-contact power transmission device includes a capacitance sensor that detects foreign matter around the cover, and the detection electrode of the capacitance sensor blocks a flow path of eddy current generated by the magnetic flux. It has a channel blocking part. Thereby, for example, even when the detection electrode is provided so as to cover the entire surface of the primary coil in plan view, the flow path of the eddy current flowing through the detection electrode caused by the magnetic flux generated from the primary coil can be blocked. . Thereby, the excessive temperature rise of a detection electrode can be suppressed. Therefore, safety can be ensured while reliably detecting the entry of foreign matter in a wide range around the cover of the power supply apparatus.
  • the non-contact power transmission device performs power transmission using electromagnetic induction between the power feeding device and the power receiving device.
  • the said power receiving apparatus was provided between the secondary coil which generate
  • an intervening shield electrode, and the detection electrode has a flow path blocking portion that blocks a flow path of eddy current generated by the magnetic flux.
  • the non-contact power transmission device includes a capacitance sensor that detects foreign matter around the cover, and the detection electrode of the capacitance sensor blocks a flow path of eddy current generated by the magnetic flux. It has a channel blocking part.
  • the detection electrode is provided so as to cover the entire surface of the secondary coil in a plan view, the flow path of the eddy current flowing through the detection electrode generated by the magnetic flux received by the secondary coil from the power feeding device is blocked. can do. Thereby, the excessive temperature rise of a detection electrode can be suppressed. Therefore, safety can be ensured while reliably detecting the entry of foreign matter in a wide range around the cover of the power receiving device.
  • a power feeding device that feeds power using electromagnetic induction to a power receiving device of a non-contact power transmission device arranged opposite to each other includes a primary coil that generates magnetic flux, and the primary coil And a detection electrode provided between the primary coil and the cover, and detects foreign matter around the cover based on a change in capacitance detected through the detection electrode.
  • a capacitance sensor and a shield electrode interposed between the detection electrode and the primary coil, the detection electrode having a flow path blocking unit that blocks a flow path of eddy current generated by the magnetic flux.
  • a capacitance sensor that detects foreign matter, and a shield electrode that is interposed between the detection electrode and the secondary coil, and the detection electrode blocks a flow path of an eddy current generated by the magnetic flux. It has a blocking part.
  • the present invention it is possible to reliably detect the entry of foreign matter between the power feeding device and the power receiving device, and it is possible to provide a non-contact power transmission device with high safety.
  • FIG. 2 is an external view showing a state where the vehicle is installed in a parking space when the power feeding device of the non-contact power transmission device shown in FIG. 1 is laid on the ground and the power receiving device is mounted on the vehicle.
  • FIG. 2 is an external view showing a state where the vehicle is installed in a parking space when the power feeding device of the non-contact power transmission device shown in FIG. 1 is laid on the ground and the power receiving device is mounted on the vehicle.
  • It shows an example of the fragmentary sectional view of (A), (B), (C) electric power feeder.
  • It is a flowchart which shows an example of the non-contact electric power transmission control and foreign material detection control which concern on this embodiment. It is the figure which showed the structural example of the detection electrode and shield electrode of a foreign material detection part.
  • FIG. 12 is a diagram showing the magnetic flux density at each position in the direction along each cross section in the XX cross section and the YY cross section in FIG. 11 (in the case of a plate coil).
  • FIG. 12 is a diagram showing the magnetic flux density at each position in the direction along each cross section in the YY cross section of FIG. 11 (in the case of a solenoid coil). It is a figure which shows an example of the electric power feeding coil unit of an electric power feeder, and the surrounding side sectional drawing. It is a figure which shows the structure of the conventional non-contact electric power transmission apparatus. It is sectional drawing of the electric power feeder (power receiving apparatus) of FIG. 15, (a) is a plane sectional view, (b) is a sectional side view. It is a figure which shows the relationship between magnetic flux density and the emitted-heat amount of a detection electrode pattern.
  • FIG. 1 is a diagram illustrating a configuration example of a non-contact power transmission apparatus according to an embodiment.
  • FIG. 2 is an external view of a state where the electric propulsion vehicle is installed in the parking space.
  • the non-contact power transmission device receives a voltage from a commercial power supply 6 and generates a magnetic field, and a power receiving device 4 that receives a magnetic field from the power supply device 2 and receives power as power. And.
  • the power feeding device 2 is connected to a commercial power source 6 and includes a power source box 8 as a power supply unit including a rectifier circuit, an inverter unit 10 that receives the output of the power source box 8, a magnetic flux (magnetic field) that receives the output from the inverter unit 10 ) That generates the primary coil 44 (referred to as a coil unit in FIG. 1), a capacitance sensor, and a foreign matter detection unit 14 that detects foreign matter, and the power supply device 2 is controlled.
  • a power supply control unit for example, a microcomputer, referred to as a control unit in FIG. 1
  • the commercial power source 6 is a 200V commercial power source which is a low frequency AC power source, for example.
  • the power receiving device 4 receives a power receiving coil unit 18 (denoted as a coil unit in FIG. 1) having a secondary coil 60 that generates an electromotive force in accordance with magnetic flux received from the power feeding coil unit 12, and an output of the power receiving coil unit 18.
  • a rectifying unit 20, a battery 22 as a load that receives an output from the rectifying unit 20, and a power reception control unit (for example, a microcomputer; referred to as a control unit in FIG. 1) 24 that controls the power receiving device 4 are provided.
  • the primary coil 44 and the secondary coil 60 may be plate coils or solenoid coils.
  • the primary coil 44 and the secondary coil 60 are preferably formed of a metal having high conductivity, for example, copper.
  • the primary coil 44 and the secondary coil 60 may be formed using another metal such as aluminum.
  • FIG. 2 shows an example in which the power supply coil unit 12 is laid on the ground and supplies power to the power receiving device 4 mounted on the electric propulsion vehicle.
  • the power supply coil unit 12 is laid on the ground, and the power supply box 8 is erected at a position separated from the power supply coil unit 12 by a predetermined distance, for example.
  • the power receiving coil unit 18 is attached to, for example, a vehicle body bottom (for example, a chassis).
  • the power feeding control unit 16 drives and controls the inverter unit 10, whereby the power feeding coil unit 12 and the power receiving coil unit.
  • a high frequency electromagnetic field is formed between The power receiving device 4 takes out electric power from the high frequency electromagnetic field and charges the battery 22 with the taken out electric power.
  • the power reception control unit 24 determines a power command value according to the detected remaining voltage of the battery 22.
  • the power supply control unit 16 receives the power command value determined by the power reception control unit 24 via wireless communication.
  • the power supply control unit 16 compares the power supply detected from the power supply coil unit 12 with the power command value received from the power reception control unit 24, and drives the inverter unit 10 so that the value of the power supply power becomes the power command value. .
  • the power reception control unit 24 detects the received power during power supply, and changes the power command value transmitted to the power supply control unit 16 so that the battery 22 is not overcurrent or overvoltage.
  • the foreign object detection unit 14 detects whether there is a foreign object around the cover 40.
  • the “periphery of the cover” refers to a region through which a magnetic field line generated by the primary coil 44 of the power feeding apparatus 2 passes during power transmission, such as a high-frequency electromagnetic field region and its vicinity. It shall refer to the region where the metal temperature rises.
  • the foreign object detection unit 14 is provided in the power feeding coil unit 12 as shown in FIG.
  • the place where the foreign object detection unit 14 is provided is not limited to the above. For example, it may be provided outside the feeding coil unit 12 or may be provided in the power receiving device 4. Specifically, for example, the power receiving coil unit 18 may be provided.
  • the “foreign matter” in the present disclosure is an object that may enter the periphery of the cover, and in particular, a metal that may be heated by an electromagnetic field and cause damage to the non-contact power transmission device. It is a piece.
  • FIG. 3 is a block diagram illustrating a configuration example of the foreign object detection unit 14.
  • FIG. 4 is a diagram illustrating an example of a partial cross-sectional view of the power feeding device 2.
  • the power supply coil unit 12 is installed on the back side of the cover 40 that covers the upper side and the side as the primary coil 44 that generates magnetic flux, the outside of the primary coil 44, and the side.
  • a foreign matter detection unit 14 and a shield electrode 45 interposed between the foreign matter detection unit 14 and the primary coil 44 are provided.
  • the foreign object detection unit 14 has a detection electrode 30 and a voltage application electrode 31 on the surface facing the cover 40.
  • the detection electrode 30 is disposed so as to be in contact with the back surface (the surface facing the primary coil 44) of the upper portion 401 of the cover 40. Therefore, the shield electrode 45 interposed between the foreign object detector 14 and the primary coil 44 is interposed between the detection electrode 30 and the primary coil 44.
  • the cover 40 has an upper portion 401 that covers the upper side of the primary coil 44, and a side portion 402 that is formed integrally with the upper portion 401 and covers the side of the primary coil 44.
  • the primary coil 44 can be protected by attaching the cover 40 so as to cover the upper side and the side of the primary coil 44.
  • the foreign object detection unit 14 includes a detection electrode 30 and a voltage application electrode 31, a voltage supply unit 32, a C / V conversion unit 34, a signal processing unit 36, and a shield electrode 45. Yes.
  • the foreign matter detection unit 14 measures the capacitance between the foreign matter 38 that has entered the cover 40 and the detection electrode 30.
  • the shield electrode 45 is interposed between the detection electrode 30 of the foreign object detection unit 14 and the primary coil 44, thereby suppressing magnetic coupling between the detection electrode 30 of the foreign object detection unit 14 and the primary coil 44.
  • the shield electrode 45 is included in the foreign object detection unit 14, but the shield electrode 45 may be provided outside the foreign object detection unit 14.
  • the position where the foreign object detection unit 14 is installed is not limited to the back surface of the cover 40.
  • the foreign object detection unit 14 may be installed at a position away from the back surface of the cover 40.
  • the detection electrode 30 of the foreign matter detection unit 14 can measure the capacitance between the detection electrode 30 and the foreign matter 38 existing on the cover 40, and can be protected from the outside. It is preferable to be installed. That is, the detection electrode 30 of the foreign matter detection unit 14 is preferably installed between the cover 40 and the primary coil 44, and is preferably installed at a location near the surface of the cover 40.
  • on the cover in the present disclosure means on the outer surface of the cover or above the outer surface of the cover.
  • the foreign matter detection unit 14 or the detection electrode 30 of the foreign matter detection unit 14 may be incorporated in the cover 40 as long as it is not exposed to the outside. Thereby, the distance with the foreign material which invaded on the cover 40 is shortened, and foreign material detection can be performed with higher accuracy.
  • the shield electrode 45 may be incorporated in the cover 40 together, or may be provided between the cover 40 and the primary coil 44.
  • the foreign substance detection part 14 or the detection electrode 30 of the foreign substance detection part 14 is installed in the back surface of both the upper part 401 and the side part 402 of the cover 40, as shown to FIG. 4 (B) and (C). Also good.
  • the shield electrode 45 is provided between the primary coil 44 and the detection electrode 30 of the foreign matter detection unit 14. In other words, the shield electrode 45 is provided above and to the side of the primary coil 44.
  • FIG. 4B shows an example in which the detection electrode 30 of the foreign matter detection unit 14 and a portion other than the electrodes are installed on the back surfaces of both the upper portion 401 and the side portion 402 of the cover 40.
  • FIG. 4B shows an example in which the detection electrode 30 of the foreign matter detection unit 14 and a portion other than the electrodes are installed on the back surfaces of both the upper portion 401 and the side portion 402 of the cover 40.
  • FIGS. 4B and 4C shows an example in which only the detection electrode 30 of the foreign matter detection unit 14 is installed above the cover 40 and on the back surface on the side.
  • the side electrode It is necessary to provide a flow path blocking portion (for example, a gap) that blocks the flow path of the current flowing in the longitudinal direction with respect to the width direction of the side portion 402 at least at one place of the detection electrodes 30 provided in the portion 402. is there.
  • a flow path blocking portion for example, a gap
  • FIGS. 4A to 4C show an example in which the foreign object detection unit 14 is provided in the power feeding device 2, but the foreign object detection unit 14 may be provided in the power receiving device 4. It is the same. Specifically, the power receiving coil unit 18 of the power receiving device 4 is provided with a secondary coil 60 in place of the primary coil 44 in FIGS. 4A to 4C. Other configurations are the same as those shown in FIGS. 4A to 4C.
  • the voltage supply unit 32 is connected to the voltage application electrode 31 and applies a predetermined potential with respect to the ground (GND) potential to the voltage application electrode 31.
  • GND ground
  • a voltage is applied to the voltage application electrode 31 by the voltage supply unit 32 and the foreign material 38 is placed on the cover 40 as shown in FIG.
  • a capacity C1 is generated. This capacitance C1 is expressed by Equation 1.
  • Equation 1 ⁇ 0 is the dielectric constant of vacuum, ⁇ r is the relative dielectric constant, S is the minimum area opposite to the detection electrode 30 and the foreign material 38, and d is the distance between the detection electrode 30 and the foreign material 38.
  • the C / V conversion unit 34 converts the capacitance C1 into a voltage value.
  • the C / V conversion unit 34 converts the capacitance value of the capacitance C1 + C2 into a corresponding voltage value.
  • the signal processing unit 36 transmits a signal corresponding to the voltage value converted by the C / V conversion unit 34, that is, a signal corresponding to the measured capacitance value to the power supply control unit 17.
  • the shield electrode 45 of the foreign matter detection unit 14 suppresses magnetic coupling between the magnetic field during power transmission and the detection electrode 30. Thereby, it can suppress that the noise resulting from the magnetic field produced in electric power transmission superimposes on the detection electrode 30 of the foreign material detection part 14. FIG. Therefore, the foreign object detector 14 can reliably detect the foreign object.
  • the shield electrode 45 is preferably grounded to the ground. Further, it may be configured to be connected to the stable potential of the circuit. For example, the shield electrode 45 may be connected to the output terminal of the rectifier circuit of the power supply box 8, the ground of the commercial power supply 6, or the ground.
  • an insulator is filled between the shield electrode 45 and the detection electrode 30.
  • a low dielectric constant resin is filled.
  • the resin preferably has a dielectric constant lower than that of air.
  • air may be filled between the shield electrode 45 and the detection electrode 30. It is preferable that the air to be filled does not contain moisture, and a configuration in which a hygroscopic material is enclosed in a space surrounded by a cover and a back plate as a base is good.
  • the power feeding control unit 16 performs wireless communication. Via the power reception control unit 24, an instruction to start power transmission and a power command value are received (S1). In S1, the power supply control unit 16 receives an instruction to start power transmission from the power reception control unit 24.
  • the present invention is not limited to this. For example, an input of an instruction to start power transmission may be received from the user.
  • the foreign matter detection unit 14 starts an operation related to the measurement of the capacitance and outputs the measured value of the capacitance to the power supply control unit 16 in S2.
  • the power supply control unit 16 stores the capacitance value received from the foreign object detection unit 14 as an initial value.
  • the detection electrode 30 is used in the portion of the foreign matter detection unit 14 that measures the capacitance.
  • the capacitance is measured using an electromagnetic field region on the cover 40 that covers the power supply coil unit 12 as a detection region.
  • the power supply control unit 16 may use a predetermined value held in advance as the initial value instead of the capacitance value received from the foreign object detection unit 14 as the initial value.
  • the power feeding control unit 16 instructs the inverter unit 10 to start power transmission, and starts power supply from the power feeding coil unit 12 to the power receiving coil unit 18 (S3).
  • the power supply control unit 16 compares the measured capacitance value (measurement capacitance) by the detection electrode 30 of the foreign object detection unit 14 with the initial setting value, and determines the capacitance value due to the invading foreign object. It is determined whether there is a change (S4).
  • the power supply control unit 16 uses, for example, “a value obtained by adding a constant value in consideration of a variation factor such as a variation due to measurement accuracy to the initial value received from the power reception control unit 24” as the initial setting value. preferable. As a result, it is possible to eliminate variation factors included in the determination of the entry of a foreign object.
  • the power supply control unit 16 determines that there is an intrusion of foreign matter, and foreign matter processing for controlling transmission power The flow is shifted to (S5). Thereby, the expansion damage by the overheating of a foreign material can be prevented.
  • the power supply control unit 16 determines that no foreign matter has entered, and continues power transmission to the inverter unit 10. (S6).
  • FIG. 5B is a flowchart showing an example of the foreign object processing (S5 in FIG. 5A).
  • the power supply apparatus 2 notifies the abnormality of the abnormality detection unit 14 by a notification means such as a display or sound.
  • notification is made by the speaker 46 shown in FIG. 2 (S21).
  • the power supply control unit 16 compares the measured capacitance with the foreign substance processing set value, and makes a detailed determination including the elimination of the factors that change with time and the risk (S22).
  • time-dependent change factor means that the capacitance may fluctuate due to changes in the environment during measurement such as temperature rise of the device or climate change, and these change factors are meant.
  • the “foreign matter processing set value” is obtained by, for example, obtaining a value obtained by adding a constant value in consideration of the above-described temporal change factor to the initial set value, or the capacitance at the time of entry of foreign matter from the design data.
  • a limit value for preventing danger is set and used based on the capacitance value.
  • the power feeding control unit 16 transmits the transmission power from the power feeding coil unit 12 to the power receiving coil unit 18. Is controlled to suppress the transmission power, such as dropping a predetermined amount (for example, 1/2) or stopping power transmission (S23). Further, the notification means that the transmission power is controlled by the intrusion of foreign matter is notified by a notification means such as display or sound (S24), the foreign matter processing is terminated, and the flow proceeds to S7.
  • step S22 when it is determined in step S22 that the measured capacitance does not exceed the set value (“NO” in S22), the power supply control unit 16 bypasses S23 and S24 and ends the foreign object processing, and the flow is as follows. The process proceeds to S7.
  • step S7 if there is no instruction to interrupt power transmission in S7 ("YES” in S7), the flow moves to step S8, and the power supply control unit 16 determines whether charging is completed. If the charging is not completed (“NO” in S8), the flow returns to step S4, whereas if the charging is completed (“YES” in S8), the power supply control unit 16 ends the power supply and the foreign matter
  • the detection unit 14 ends the foreign object detection operation (S9).
  • FIG. 6 is a diagram illustrating a configuration example of the detection electrode 30 and the shield electrode 45 of the foreign object detection unit 14 according to the present embodiment.
  • the detection electrode 30 and the shield electrode 45 are made of metal (for example, copper is preferable, but other metals may be used).
  • the detection electrode 30 and the shield electrode 45 are formed in an annular shape in which the outer circumference circle is smaller than the outer circumference circle of the primary coil 44 and the inner circumference circle is smaller than the inner circumference circle of the primary coil 44, and a detection electrode is partially formed 30 and the shield electrode 45 so as to penetrate outward in the radial direction of the detection electrode 30 and the shield electrode 45 (hereinafter simply referred to as the radial direction), and in the circumferential direction of the detection electrode 30 and the shield electrode 45 (hereinafter referred to as the radial direction).
  • a gap 42 is provided as a flow path blocking section that blocks a current flow path in the circumferential direction.
  • the detection electrode 30 and the shield electrode 45 are formed in a C shape.
  • the outer circumference circle of the detection electrode 30 and the shield electrode 45 is smaller than the outer circumference circle of the primary coil 44, but the outer circumference circle of the detection electrode 30 and the shield electrode 45 is made larger than the outer circumference circle of the primary coil 44. May be.
  • the inner circumferential circle of the shield electrode 45 is not necessarily required, and may be a fan shape having a radial gap 42, or the outer circumferential circle of the shield electrode 45 is made larger than the outer circumferential circle of the detection electrode 30. Also good.
  • the shield electrode 45 may not be provided with a flow path blocking part.
  • the magnetic coupling between the detection electrode 30 of the foreign matter detection unit 14 and the primary coil 44 can be suppressed in a wider range.
  • the foreign matter detection unit 14 of this aspect blocks the flow path of eddy currents (eddy currents generated due to the linkage of magnetic flux generated by the primary coil 44) generated in the detection electrodes 30 and the shield electrodes 45. be able to. Thereby, even when the detection electrode 30 and the shield electrode 45 are arranged in the same range as the primary coil 44, an excessive temperature rise of the detection electrode 30 and the shield electrode 45 can be suppressed. Therefore, safety can be ensured while reliably detecting the entry of foreign matter in a wide range between the power feeding device 2 (primary coil 44) and the power receiving device 4 (secondary coil 60).
  • eddy currents eddy currents generated due to the linkage of magnetic flux generated by the primary coil 44
  • gap part 42 are not restricted to the shape of FIG.
  • the detection electrode 30 and the shield electrode 45 may be provided in a range in which foreign matter is desired to be detected, and the flow path blocking unit is configured to generate an eddy current (a primary coil 44 is generated) flowing through the arranged detection electrode 30 and shield electrode 45. What is necessary is just to be formed so that the flow path of the eddy current resulting from the linkage of magnetic flux) may be blocked.
  • FIG 7 and 8 are diagrams showing another configuration example of the detection electrode 30, the shield electrode 45, and the flow path blocking unit.
  • the annular detection electrode 30 and the shield electrode 45 similar to those in FIG. 6 are formed so as to penetrate along the radial direction from a portion of the outer peripheral circle to another portion of the outer peripheral circle.
  • a gap 43 is formed as a flow path blocking section for blocking the flow path of the current flowing through the.
  • a cutout portion 49 serving as a wedge-shaped flow path blocking portion is provided in a range in which the detection electrode 30 and the shield electrode 45 do not reach the outer peripheral circle from the center toward the outer side in the radial direction. Are formed radially from the center.
  • the detection electrode 30 and the shield electrode 45 are electrically separated into two detection electrode portions and two shield electrode portions by the gap 43, and radial notches are formed in the respective detection electrode portions and shield electrode portions.
  • a plurality of portions 49 are formed.
  • FIG. 7 shows an example in which both the gap 43 and the notch 49 are provided, only one of the gap 43 and the notch 49 may be provided.
  • the notch 49 is not limited to a triangular shape. For example, it may be a square shape or a trapezoidal shape.
  • the detection electrode 30 and the shield electrode 45 are formed in a quadrangular shape whose length of one side is substantially the same as the diameter of the primary coil 44. Further, the detection electrode 30 and the shield electrode 45 are formed so as to penetrate from the center of each side to the center of the opposite side, and the current flow path flowing in the circumferential direction with respect to the detection electrode 30 and the shield electrode 45 is blocked. A gap portion 50 is formed as a flow path blocking portion. In other words, the detection electrode 30 and the shield electrode 45 are electrically separated into the four detection electrode portions 301 to 304 and the four shield electrode portions 451 to 454 by the gap 50, respectively.
  • FIG. 8 shows an example in which the detection electrode 30 and the shield electrode 45 are electrically separated into the four detection electrode portions 301 to 304 and the four shield electrode portions 451 to 454 by the gap 50.
  • the number of separation is not limited to four, and may be more or less than four.
  • the position where the gap 50 is formed in the detection electrode 30 and the shield electrode 45 is not limited to the center of each side.
  • FIG. 9 is a diagram for explaining an example of the foreign matter detection processing by the foreign matter detection unit 14 having the detection electrode 30 shown in FIG.
  • the foreign object detection unit 14 includes detection electrode units 301 to 304, a switching unit 51, a C / V conversion unit 34, and a signal processing unit 36.
  • the voltage supply unit 32 and the shield electrode units 451 to 454 are not shown.
  • the switching unit 51 is connected to the detection electrode units 301 to 304, and selects any one of the detection electrode units 301 to 304 as an electrode for detecting a change in capacitance.
  • the C / V conversion unit 34 is connected to the detection electrode units 301 to 304 selected by the switching unit 51 via the switching unit 51, and converts the capacitance into a voltage value.
  • the signal processing unit 36 transmits a signal corresponding to the voltage value converted by the C / V conversion unit 34, that is, a signal corresponding to the measured capacitance value to the power supply control unit 17.
  • the switching unit 51 selects the detection electrode units 301 to 304 by time division, for example.
  • the foreign material detection part 14 can pinpoint the penetration
  • the electrodes of the foreign matter detector 14 are provided on both the back surface of the upper portion 401 and the back surface of the side portion 402 as shown in FIGS. It is possible to determine whether or not is located above the primary coil 44. Thereby, the control amount at the time of transmission power control in S23 of Drawing 5 (B) can be adjusted according to a foreign substance position, for example.
  • FIG. 10 (A) is a diagram showing the relationship between the magnetic flux density ⁇ and the electrode pattern width for reducing the heat generation amount to a predetermined value or less. More specifically, FIG. 10A shows a magnetic flux density ⁇ interlinked with the electrode pattern in the electrode pattern having a length of 10 mm and a width of a [mm] shown in FIG. The relationship with the electrode pattern width a for making it below a predetermined calorific value is shown. The relationship between the magnetic flux density ⁇ and the electrode pattern width a for making it equal to or less than a predetermined calorific value is expressed by Equation 2.
  • Equation 2 K / a (Equation 2)
  • K is a constant.
  • the width a of the detection electrode pattern that is equal to or less than a predetermined calorific value varies depending on the height of the interlinkage magnetic flux density ⁇ .
  • FIG. 11 and FIG. 12 are diagrams for explaining the formation of the flow path blocking unit when the detection electrode 30 of the foreign object detection unit 14 is formed with an electrode pattern.
  • FIG. 11 is a diagram illustrating an example of an electrode pattern constituting the detection electrode 30 of the foreign object detection unit 14.
  • 12 is a diagram showing the magnetic flux density at each position in the direction along the cross-section (left-right direction in FIG. 12) in the XX cross-section and the YY cross-section of FIG.
  • FIG. 12 shows an example in which a plate coil is used as the primary coil 44.
  • the magnetic flux density is maximized near the center of the coil portion 47 of the primary coil 44, and the magnetic flux density is minimized near the center of the primary coil 44.
  • the magnetic flux density is maximum near the center of the primary coil 44, and the magnetic flux is near the ends on both sides in the left-right direction (left-right direction in FIG. 12) in the side cross-sectional view of the primary coil 44. The density is minimized.
  • FIG. 11A shows that the detection electrode 30 (electrode pattern) is divided into three zones A to C at each position of the detection electrode 30 (electrode pattern) according to the height of the interlinkage magnetic flux density.
  • FIG. The A zone is the region where the interlinkage magnetic flux density is the highest, and the C zone is the region where the interlinkage magnetic flux density is the lowest.
  • FIGS. 11B to 11D are diagrams showing examples of electrode patterns in the respective areas of the A to C zones. More specifically, (B) is an enlarged view of the electrode pattern in the area X of the A zone, (C) is an enlarged view of the electrode pattern in the area Y of the B zone, and (D) is an area of the C zone. It is an enlarged view of the electrode pattern in Z.
  • the electrode pattern in the region X is formed integrally with the first electrode pattern portion 52 and the first electrode pattern portion 52 that are formed along the circumferential direction.
  • a plurality of second electrode pattern portions 53 extending radially outward from the portion 52, and a third electrode pattern portion formed integrally with the second electrode pattern portion 53 and formed in a comb shape along the circumferential direction 54.
  • a plurality of “second electrode pattern portions 53 in which the comb-shaped third electrode pattern portion 54 is formed” are formed side by side in the circumferential direction.
  • a gap portion 55 is formed as a flow path blocking portion.
  • a gap portion 56 as a flow path blocking portion is formed between two adjacent third electrode pattern portions 54.
  • the pattern width of the first, second and third electrode pattern portions 52 to 54 is a1.
  • a1 is set to a value at which the maximum magnetic flux density ⁇ in the A zone is not more than a predetermined heat generation amount even when the first to third electrode pattern portions 52 to 54 are linked.
  • the shape of the electrode pattern in the region Y is the same as that in FIG. 11B, and the pattern widths of the first to third electrode pattern portions 52 to 54 are a2.
  • a2 is set to a value at which the maximum magnetic flux density ⁇ in the B zone is not more than a predetermined heat generation amount even when the first to third electrode pattern portions 52 to 54 are linked.
  • the shape of the electrode pattern in the region Z is a shape obtained by omitting the third electrode pattern portion from FIG.
  • the pattern width of the first and second electrode pattern portions 52 and 53 is a3.
  • a3 is set to a value at which the maximum magnetic flux density ⁇ in the C zone is not more than a predetermined heat generation amount even when the first and second electrode pattern portions 52 and 53 are linked.
  • the first electrode pattern portion 52 is formed so as to extend along the circumferential direction, and at least part of the first electrode pattern portion 52 is formed with a gap portion as a flow path blocking portion. ing.
  • the wiring density is higher in the region where the interlinkage magnetic flux density is higher (for example, the A zone) than in the region where the interlinkage magnetic flux density is lower (for example, the C zone). It is low.
  • a flat electrode may be used as the detection electrode 30 without using the electrode pattern. Therefore, for example, when the detection electrode 30 (foreign matter detection unit 14) is installed on the back surface of the side portion 402 of the cover 40, a flat plate electrode may be used if the interlinkage magnetic flux is sufficiently small. In this case, for example, only the detection electrode 30 may be provided on the side portion 402 of the cover 40, and the portion other than the detection electrode 30 of the foreign matter detection unit 14 may be omitted (see FIG. 4C).
  • the shape of the electrode pattern portion is not limited to FIGS. 11 (B) to (D).
  • the wiring width included in the electrode pattern is set to a value that is equal to or less than a predetermined calorific value even when the maximum magnetic flux density ⁇ in the region is interlinked, and is caused by the magnetic flux interlinking the electrode pattern. It is only necessary to form a flow path blocking unit that blocks eddy current.
  • the second electrode pattern portion 53 extends from the first electrode pattern portion 52 outward in the radial direction. It may extend inward.
  • a plurality of first electrode pattern portions 52 may be formed in each zone. In that case, second and third electrode pattern portions 53 and 54 are formed for each first electrode pattern portion 52.
  • the space between two adjacent “second electrode pattern portions 53 on which the comb-shaped third electrode pattern portion 54 is formed” spreads outward in the radial direction. Therefore, for example, in FIGS. 11B and 11C, the length of the third electrode pattern portion 54 may be gradually increased toward the outer side in the radial direction. Further, in FIG. 11D, the third electrode pattern portion 54 is omitted, but the third electrode pattern having a pattern width of a3 is formed on the outer side in the radial direction as in FIGS. 11B and 11C. A portion 54 may be provided. Thereby, it can prevent that the place where an electrode pattern part does not exist is formed in the outside of a diameter direction.
  • FIG. 13 shows the magnetic flux density at each position in the direction along the cross-section (left-right direction in FIG. 13) in the YY cross-section of FIG. 11 when the primary coil is a solenoid coil (coil portion 48).
  • FIG. 13 As shown in FIG. 13, based on the height of the interlinkage magnetic flux density, the same region division as that in FIG. 12 can be performed, and an electrode pattern may be formed based on this region.
  • the detection electrode 30 of the foreign object detection unit 14 by forming the detection electrode 30 of the foreign object detection unit 14 with an electrode pattern, an eddy current generated in the detection electrode 30 and the shield electrode 45 (an eddy generated due to the linkage of magnetic flux generated by the primary coil 44).
  • the current flow path can be interrupted.
  • the pattern width is set in accordance with the magnetic flux intensity, the pattern width can be increased or a flat electrode can be used in a portion where the interlinkage magnetic flux density is low, and the detection electrode can be easily formed.
  • FIG. 14 is a diagram illustrating an example of a side sectional view of the power feeding coil unit 12 and the periphery of the power feeding device 2.
  • the power supply device 2 in addition to the power supply coil unit 12 shown in FIG. 4A, the power supply device 2 has a base 71 to which the cover 40 is attached, one end fixed to the base 71, and the other end covering the lower surface of the shield electrode 45. And a supporting member 70 for supporting. 4A, the foreign object detection unit 14 and the shield electrode 45 are longer in the left-right direction (left-right direction in FIG. 14) in a side sectional view.
  • the foreign object detection unit 14 is arranged so that the surface of the detection electrode 30 is in contact with the back surface (surface on the primary coil 44 side) of the upper portion 401 of the cover 40. Can be supported. Thereby, compared with the case where the detection electrode 30 is provided in the position away from the back surface of the upper part 401, the distance with the foreign material on the cover 40 can be shortened. That is, by providing the support member 70 in the power feeding device 2, foreign matter that has entered the periphery of the cover 40 can be reliably detected.
  • the present invention is not limited to this.
  • the foreign matter detection unit 14 may be provided in the power receiving coil unit 18 of the power receiving device 4.
  • the power supply coil unit 12 and the power receiving coil unit 18 may be provided with foreign matter detection units, respectively.
  • processing such as foreign matter detection is performed step by step.
  • processing such as foreign object detection may be performed based on one reference with a set value as an initial set value.
  • the detection electrode 30 and the shield electrode 45 are described as overlapping, but the present invention is not limited to this.
  • the sizes of the detection electrode 30 and the shield electrode 45 may be different, or there may be portions that do not overlap.
  • the shield electrode 45 is preferably provided below the detection electrode 30. Therefore, even when the detection electrode 30 and the shield electrode 45 are different in size, the area of the shield electrode 45 is preferably larger than the area of the detection electrode.
  • the contactless power transmission device of the present invention can reliably detect foreign matter that has entered the periphery of the cover during power feeding from the power feeding device to the power receiving device, so that, for example, a person or an object approaches carelessly or mistakenly. This is useful for power supply to a power receiving device provided in a potential electric propulsion vehicle.

Abstract

La présente invention a trait à un dispositif d'alimentation en énergie (2) d'un dispositif de transmission d'énergie sans contact, lequel dispositif d'alimentation en énergie est doté d'une bobine primaire (44) qui permet de générer un flux magnétique, d'un couvercle qui permet de recouvrir la bobine primaire (44) et d'une électrode de détection qui est disposée entre la bobine primaire (44) et le couvercle. L'invention concerne également un détecteur de capacitance (14) qui permet de détecter un corps étranger dans la zone située autour du couvercle en fonction d'une variation de la capacitance détectée par l'intermédiaire de l'électrode de détection, et une électrode de blindage qui est intercalée entre l'électrode de détection et la bobine primaire (44). L'électrode de détection est pourvue d'une partie de fermeture de trajectoire du courant qui permet de fermer la trajectoire du courant d'un courant de Foucault qui est généré par le flux magnétique.
PCT/JP2012/006930 2011-10-28 2012-10-29 Dispositif de transmission d'énergie sans contact et dispositif d'alimentation en énergie ainsi que dispositif de réception d'énergie utilisés dans celui-ci WO2013061615A1 (fr)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2814046A3 (fr) * 2013-06-11 2015-04-29 Kabushiki Kaisha Toshiba Dispositif de prévention de fuite d'ondes électromagnétiques
WO2015068476A1 (fr) * 2013-11-06 2015-05-14 本田技研工業株式会社 Système de transmission d'énergie sans contact
WO2015176856A1 (fr) * 2014-05-20 2015-11-26 Bombardier Transportation Gmbh Boîtier pour au moins un dispositif de détection d'objet, unité primaire et ensemble dalle de chaussée
JP2016529865A (ja) * 2013-08-06 2016-09-23 モーメンタム ダイナミックス コーポレーション 無線誘導電力伝送におけるコイルアライメント誤差を検出する方法および装置
EP3061643A4 (fr) * 2013-09-27 2016-11-02 Nissan Motor Structure de montage de véhicule d'un dispositif de réception d'électricité sans contact
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