WO2013065283A1 - Appareil de charge sans contact - Google Patents

Appareil de charge sans contact Download PDF

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Publication number
WO2013065283A1
WO2013065283A1 PCT/JP2012/006921 JP2012006921W WO2013065283A1 WO 2013065283 A1 WO2013065283 A1 WO 2013065283A1 JP 2012006921 W JP2012006921 W JP 2012006921W WO 2013065283 A1 WO2013065283 A1 WO 2013065283A1
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WO
WIPO (PCT)
Prior art keywords
power
unit
foreign object
primary coil
coil
Prior art date
Application number
PCT/JP2012/006921
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English (en)
Japanese (ja)
Inventor
芳弘 阪本
大森　義治
藤田　篤志
秀樹 定方
裕明 栗原
Original Assignee
パナソニック株式会社
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Publication of WO2013065283A1 publication Critical patent/WO2013065283A1/fr

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    • 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
    • H01M10/44—Methods for charging or discharging
    • 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
    • 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
    • H02J50/80—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
    • 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
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M7/00—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
    • B60M7/003—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway for vehicles using stored power (e.g. charging stations)
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • 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
    • 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
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the present invention relates to a non-contact charging device used for charging electric propulsion vehicles such as electric vehicles and plug-in hybrid vehicles.
  • FIG. 11 is a schematic diagram showing a configuration of a conventional non-contact charging apparatus 101.
  • the non-contact power feeding device (primary side) F connected to the power panel of the ground-side power source 104 is physically connected to the power receiving device (secondary side) G mounted on the electric propulsion vehicle. It arrange
  • an alternating current is applied to the primary coil 102 provided in the power feeding device F to form a magnetic flux
  • an induced electromotive force is generated in the secondary coil 103 provided in the power receiving device G.
  • electric power is transmitted from the primary coil 102 to the secondary coil 103 in a non-contact manner.
  • the power receiving device G is connected to the in-vehicle battery 105, for example, and the in-vehicle battery 105 is charged with the transmitted power as described above.
  • the in-vehicle motor 106 is driven by the electric power stored in the in-vehicle battery 105.
  • necessary information exchange is performed between the power supply apparatus F and the power reception apparatus G, for example, by the wireless communication apparatus 107.
  • FIG. 12 is a schematic diagram showing the internal structure of the power feeding device F and the power receiving device G.
  • FIG. 12A is a schematic diagram illustrating an internal structure when the power feeding device F is viewed from above and the power receiving device G is viewed from below.
  • FIG. 12B is a schematic diagram illustrating an internal structure when the power feeding device F and the power receiving device G are viewed from the side.
  • the power feeding device F includes a primary coil 102, an insulating unit 108, a primary magnetic core 112, a substrate 110, a cover 111, and the like.
  • the power receiving device G includes a secondary coil 103, an insulating portion 108, a secondary magnetic core 113, a substrate 110, a cover 111, and the like.
  • the power receiving device G has a symmetric structure with the power feeding device F.
  • the primary coil 102 and the secondary coil 103 have a structure in which a conducting wire is wound flatly and spirally on the same surface. Moreover, the primary magnetic core 112 and the secondary magnetic core 113 in which the primary coil 102 and the secondary coil 103 are arrange
  • positioned are formed in flat form.
  • the primary core core 112 and the secondary core core 113 are typically made of ferrite, solidified iron iron, or other ferrous material, and are made of a ferromagnetic material having a high magnetic permeability. Thereby, the strengthening function and guide function of the magnetic flux D are exhibited. That is, the primary core core 112 and the secondary core core 113 increase the inductance between the primary coil 102 and the secondary coil 103, strengthen the electromagnetic coupling between them, and induce and collect the formed magnetic flux. It functions to orient.
  • the primary magnetic core 112 and the secondary magnetic core 113 are formed in a flat plate shape having no irregularities.
  • the power feeding device F and the power receiving device G are basically installed outdoors, it is conceivable that foreign matter will be placed on the cover 111.
  • a metal object which is an example of a foreign object
  • the cover 111 when a metal object, which is an example of a foreign object, is placed on the cover 111 during power transmission, if the metal object is left as it is, the metal object is overheated.
  • a loop-shaped conductor capable of interlinking magnetic flux is inserted between the primary coil 102 and the secondary coil 103, an electromotive force is generated at both ends of the conductor. If the foreign matter that has entered the cover 111 rises in temperature excessively, there is a possibility that the power feeding device F and the power receiving device G will be damaged. From the above, it is required to reliably detect the entry of foreign matter between the primary coil 102 and the secondary coil 103 during power transmission.
  • an object of the present invention is to provide a non-contact charging device that can reliably detect the intrusion of foreign matter.
  • one embodiment of the present invention is a contactless charging device including a power feeding device that supplies power to a power receiving device in a contactless manner, and the power feeding device generates a magnetic flux by an input alternating current.
  • a primary coil that is generated; a cover that covers the primary coil; and a detection unit that detects the movement of an object existing around the cover.
  • a Doppler sensor is used as the detection unit.
  • a primary magnetic core for arranging the primary coil is provided, and the Doppler sensor is arranged at a position lower than the primary magnetic core.
  • Non-contact charging device including a power receiving device that receives power supply in a non-contact manner from the power feeding device side, and the power receiving device responds to magnetic flux generated in a primary coil on the power feeding device side.
  • a secondary coil that generates an electromotive force
  • a cover that covers the secondary coil
  • a detection unit that detects the movement of an object existing around the cover.
  • a Doppler sensor is used as the detection unit.
  • a secondary magnetic core for arranging the secondary coil is provided, and the Doppler sensor is arranged at a position lower than the secondary magnetic core.
  • the power feeding device and the power receiving device of the non-contact charging device include the motion detection unit that can detect the movement of the object on the cover, and therefore, between the primary coil and the power receiving device or between the power feeding device and the power receiving device. It becomes possible to reliably detect the intrusion of foreign matter into the next coil.
  • on the cover means on the outer surface of the cover or above the outer surface of the cover.
  • the detection unit detects a movement of an object between a primary coil of the power feeding device and a secondary coil of the power receiving device.
  • invades between a primary coil and a secondary coil can be detected reliably.
  • a Doppler sensor as the detection unit. This is because the use of the Doppler effect can reliably detect the intrusion of all foreign substances.
  • a detection area by radio waves can be formed between the primary coil and the secondary coil, and the movement of the object in the detection area can be detected. Therefore, it is possible to reliably detect any foreign matter entering between the primary coil and the secondary coil.
  • the non-contact charging device since the non-contact charging device includes the detection unit that can detect the movement of the object around the cover, the contactless charging device is between the primary coil and the power receiving device or between the secondary coil and the power feeding device. It is possible to reliably detect the entry of foreign matter. Moreover, an object can be reliably detected by using a Doppler sensor as a detection part. Furthermore, the influence from a primary coil or a secondary coil can be reduced by installing a Doppler sensor in the position lower than a primary magnetic core or a secondary magnetic core.
  • FIG. 1 is a block diagram of a contactless charging apparatus according to an embodiment.
  • FIG. 2 is a front view of the contactless charging apparatus shown in FIG.
  • FIG. 3 is a schematic diagram showing an electromagnetic field region generated by the non-contact charging apparatus shown in FIG.
  • FIG. 4 is a schematic diagram showing another example of the electromagnetic field region shown in FIG.
  • FIG. 5 is a schematic diagram illustrating an electromagnetic field region, a power control region, and a foreign object intrusion detection region that occur in the non-contact charging apparatus according to the embodiment.
  • FIG. 6 is a flowchart showing foreign object detection and transmission power control in the non-contact power transmission apparatus of FIG.
  • FIG. 7 is a flowchart showing a process of determining the foreign object intrusion detection area shown in FIG. FIG.
  • FIG. 8 is a flowchart showing processing when a foreign object enters.
  • FIG. 9 is a block diagram illustrating an example in which the detection unit is configured by a Doppler sensor.
  • FIG. 10 is a schematic diagram illustrating an installation example of the detection unit.
  • FIG. 11 is a schematic diagram showing a configuration of a conventional non-contact power transmission system.
  • FIG. 12 is a schematic diagram illustrating an internal configuration of the power feeding device and the power receiving device illustrated in FIG. 11.
  • FIG. 1 is a block diagram of a contactless charging apparatus according to an embodiment of the present invention.
  • FIG. 2 is an external view of the vehicle installed in the parking space.
  • the non-contact charging device includes a power feeding device 2 installed in a parking space, for example, and a power receiving device 4 mounted in an electric propulsion vehicle, for example.
  • the power supply device 2 includes a power supply unit 8 connected to a commercial power source 6, an inverter unit 10, a primary coil unit 12, a foreign object detection unit 14 as a detection unit, and a power supply device side control unit 16 (for example, a microcomputer).
  • a control unit 16 for example, a microcomputer
  • the power receiving device 4 includes a coil unit 18, a rectifying unit 20, a battery 22 that is a load, and a power receiving device side control unit 24 that is a microcomputer, for example (hereinafter referred to as a control unit 24). .
  • the commercial power source 6 is a 200 V commercial power source that is a low-frequency AC power source, for example, and is connected to the input end of the power supply unit 8.
  • the output end of the power supply unit 8 is connected to the input end of the inverter unit 10, and the output end of the inverter unit 10 is connected to the primary coil unit 12.
  • the power supply unit 8 converts AC power into DC power and supplies it to the inverter unit 10.
  • the inverter unit 10 performs a switching operation according to the control of the control unit 16, converts the power from the power supply unit 8 into AC power, and supplies the AC power to the primary coil unit 12.
  • the primary coil unit 12 is laid on the ground, for example, and the power supply unit 8 is arranged, for example, separated from the primary coil unit 12 by a predetermined distance.
  • the output end of the coil unit 18 is connected to the input end of the rectifying unit 20, and the output end of the rectifying unit 20 is connected to the battery 22.
  • the secondary coil unit 18 generates an induced electromotive force by the magnetic flux from the primary coil unit 12.
  • the rectifying unit 20 rectifies the electric power generated by the secondary coil unit 18 and supplies the rectified power to the battery 22.
  • the secondary coil unit 18 is attached to the bottom of the vehicle body such as a chassis.
  • the control unit 16 performs wireless communication with the control unit 24.
  • the control unit 24 detects the remaining voltage of the battery 22, determines a power command value corresponding to the remaining voltage, and transmits the determined power command value to the control unit 16.
  • the control unit 16 compares the value of the feeding power detected from the primary coil unit 12 with the received power command value, and drives and controls the inverter unit 10 so that the value of the feeding power becomes the power command value.
  • control unit 24 detects the received power from the secondary coil unit 18 and changes the power command value to the control unit 16 so that the battery 22 is not overcurrent or overvoltage.
  • the primary coil unit 12 and the secondary coil unit 18 are arranged to face each other by appropriately moving the vehicle.
  • the control part 16 drive-controls the inverter part 10, and a high frequency electromagnetic field is formed between the primary coil unit 12 and the secondary coil unit 18.
  • FIG. 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 foreign matter detection unit 14 is for detecting the movement of the foreign matter in the electromagnetic field region A1 and the vicinity thereof.
  • the foreign object detection unit 14 is provided in the primary coil unit 12 of the power feeding device 2, but may be provided in the secondary coil unit 18 of the power receiving device 4.
  • the “foreign matter” in the present invention is a moving object that may enter the electromagnetic field region A1, such as a person or an object.
  • the contactless charging device (this embodiment) is heated by an electromagnetic field.
  • it is a metal piece or the like that may cause damage to the power feeding device 2).
  • FIG. 3 shows an electromagnetic field region formed between the ground side coil unit and the vehicle side coil unit constituting the contactless charging apparatus of FIG.
  • FIGS. 3A and 3B are schematic views when the coil center of the ground-side coil unit and the coil center of the vehicle-side coil unit are coincident with each other when viewed from above.
  • the electromagnetic field region A ⁇ b> 1 is formed between the primary coil unit 12 and the secondary coil unit 18 by making the secondary coil unit 18 face the primary coil unit 12. It should be noted that the coil center of the secondary coil unit 18 and the coil center of the primary coil unit 12 coincide with each other when viewed from above (see FIG. 3A), as shown in FIG. 3B. In addition, the vehicle body may be shifted in the left-right or front-rear direction. That is, the electromagnetic field region A1 also occurs in a range where the primary coil unit 12 and the secondary coil unit do not face each other.
  • FIG. 4 shows another example of the electromagnetic field region formed between the ground side coil unit and the vehicle side coil unit.
  • FIGS. 4A and 4B are schematic views when the vehicle is light and heavy, respectively.
  • the secondary coil unit 18 and the primary coil unit 12 The distance between and may not be constant. For example, the distance varies depending on the number of passengers on the vehicle or the weight of the loaded luggage.
  • 4A shows a case where the weight of the vehicle including the occupant and the luggage is light
  • FIG. 4B shows a case where the weight of the vehicle including the occupant and the luggage is heavy.
  • the electromagnetic field region A1 is determined based on the positional relationship between the coil center of the secondary coil unit 18 and the coil center of the primary coil unit 12. Then, a power control area A2 wider than the electromagnetic field area A1 and a foreign substance intrusion detection area A3 wider than the power control area A2 are provided, and it is determined whether or not a foreign substance has entered the foreign substance intrusion detection area A3 or the power control area A2. Thus, power feeding control is performed before the foreign matter enters the electromagnetic field region A1.
  • a signal indicating the coil center of the secondary coil unit 18 is transmitted from the control unit 24 to the control unit 16, and the control unit 16 that has received this signal has a positional relationship with the coil center of the primary coil unit 12 ( Recognize the three-dimensional positional relationship between the horizontal direction and the height direction).
  • the control unit 16 recognizes the positional relationship between the coil center of the primary coil unit 12 and the coil center of the secondary coil unit 18, an electromagnetic field region corresponding to the coil size of the primary coil unit 12 and the coil size of the secondary coil unit 18.
  • Set A1 The size of the coil used for the primary coil unit 12 may be stored in advance in the control unit 16, and the size of the coil used for the secondary coil unit 18 is transmitted from the control unit 24 to the control unit 16. You may do it.
  • the control unit 16 sets the power control region A2 in which the first predetermined length is added to the horizontal direction and the height direction of the electromagnetic field region A1, and the horizontal direction and the height direction of the electromagnetic field region A1.
  • a foreign object intrusion detection area A3 is set by adding a second predetermined length longer than a predetermined length of 1.
  • FIG. 5 shows the electromagnetic field region, the power control region, and the foreign object intrusion detection region set as described above.
  • FIG. 5A shows the region when viewed from the rear of the vehicle, and FIG. The case where these areas are viewed from the side of the vehicle is shown.
  • the foreign substance intrusion detection area A3 is set to be wider than the power control area A2, and the power control area A2 is set to be wider than the electromagnetic field area A1.
  • step S ⁇ b> 1 of the flowchart of FIG. 6 the vehicle equipped with the power receiving device 4 stops so that the primary coil unit 12 and the secondary coil unit 18 face each other, and the control unit 16 receives a power command value from the control unit 24. Then, the control unit 16 instructs the inverter unit 10 to start power transmission.
  • step S2 the foreign substance intrusion detection area A3 and the power control area A2 are confirmed.
  • the foreign substance intrusion detection area A3 will be described with reference to the flowchart of FIG.
  • step S11 as described above, a signal indicating the coil center of the secondary coil unit 18 is transmitted from the control unit 24 to the control unit 16, and based on this signal, the control unit 16 determines the position of the secondary coil unit 18. Is detected.
  • step S12 the control unit 16 recognizes the horizontal displacement of the secondary coil unit 18 with respect to the primary coil unit 12.
  • control part 16 recognizes the position shift of the height direction of the secondary coil unit 18 with respect to the primary coil unit 12 in step S13.
  • step S14 the control unit 16 determines the electromagnetic field as shown in FIG. 3 and FIG. 4 based on the horizontal and height misalignment of the secondary coil unit 18 with respect to the primary coil unit 12 and the coil size.
  • the area A1 is determined.
  • step S15 the control unit 16 determines the power control region A2 obtained by adding the first predetermined length in the horizontal direction and the height direction of the determined electromagnetic field region A1, and further determines the horizontal of the electromagnetic field region A1.
  • the foreign object intrusion detection area A3 is determined by adding a second predetermined length longer than the first predetermined length in the direction and the height direction.
  • step S16 the control unit 16 ends the determination process of the foreign object intrusion detection area A3 and the power control area A2.
  • step S3 shown in FIG. 6 the foreign object detector 14 starts the foreign object detection operation. Details of the foreign matter detection unit 14 will be described.
  • FIG. 9 is a block diagram of the foreign object detection unit 14.
  • the foreign object detection unit 14 is a Doppler sensor that can detect the movement of an object using, for example, the Doppler effect.
  • the foreign object detection unit 14 includes an oscillation unit 30, an amplification unit 32, a transmission antenna 34, a reception antenna 36, a mixer unit 38, a filter unit 40, and a signal processing unit 42.
  • the oscillation unit 30 generates and outputs a high-frequency signal having a frequency of cos (f0) based on the signal having the frequency f0.
  • the amplifying unit 32 amplifies a high frequency signal having a frequency of cos (f0) to a predetermined power, thereby generating a radio wave having a frequency of cos (f0). Then, this radio wave is radiated from the transmission antenna 34.
  • FIG. 10 is a schematic diagram showing an installation example of the foreign object detection unit.
  • the foreign object detection unit 14 is installed on the substrate 110 of the primary coil unit 12 (see FIG. 2 and the like), for example, like the power supply device 2 shown in FIG.
  • the power feeding device 2 includes a primary coil 102, an insulating unit 108, a primary magnetic core 112, a substrate 110, a cover 111, and the like.
  • the electromagnetic field intensity of the magnetic field 44 generated by the primary coil 102 is greatly reduced below the boundary line 46 due to the effect of the primary core 112. Therefore, the influence of the magnetic field 44 can be suppressed by installing the foreign object detection unit 14 at a position lower than the primary magnetic core 112, that is, below the boundary line 46 (side closer to the substrate 110).
  • the primary magnetic core 112 is made of ferrite, for example.
  • the foreign matter detection unit 14 is installed at the position shown in FIG. 10, but in the region including each of the electromagnetic field region A1, the power control region A2, and the foreign matter intrusion detection region A3 shown in FIG.
  • the detection area may be formed by radio waves from the unit 14 and may be installed at a position where the influence of the magnetic field 44 from the primary coil 102 can be avoided.
  • the foreign matter detection unit 14 may be disposed at a position opposite to the primary coil 102 as viewed from the primary magnetic core 112 in the direction from the primary magnetic core 112 to the primary coil 102.
  • the foreign object detection unit 14 receives the radio wave of cos (f0 + fd) reflected from the approaching foreign object 50 and added with the Doppler frequency fd corresponding to the moving speed v of the foreign object 50 from the receiving antenna 36. To do.
  • the foreign matter detection unit 14 is configured to emit a radio wave having a frequency of cos (f), receive a radio wave having a frequency of cos (f0 + fd), and calculate the Doppler frequency based on the received radio wave. .
  • the mixer unit 38 multiplies cos (f0), which is the frequency of the signal output from the oscillation unit 30, and cos (f0 + fd), which is the frequency of the signal received by the receiving antenna 36.
  • a signal having a frequency of cos (fd) + cos (2f0 + fd), which is a result of the multiplication, is output to the filter unit 40, and the filter unit 40 removes cos (2f0 + fd), which is a high-frequency component, from the output of the mixer unit 38.
  • a signal having a frequency of cos (fd) is extracted, and the signal processing unit 42 calculates a Doppler frequency fd from this signal.
  • the moving speed v of the foreign object 50 can be calculated using Equation 1.
  • c is the speed of light (3 ⁇ 10 8 m / s).
  • the moving speed v of the foreign object 50 is 60 km / h.
  • the signal processing unit 42 calculates the moving speed v and moving direction of the foreign object 50, and transmits a signal corresponding to the moving speed and moving direction of the foreign object 50 to the control unit 16 of the power supply apparatus 2 as shown in FIG. To do.
  • the case where the foreign object 50 is approaching the foreign object detection unit 14 is described as an example.
  • the Doppler frequency fd is subtracted from the frequency output by the oscillation unit 30.
  • a radio wave having a frequency of cos (f0 ⁇ fd) is received from the receiving antenna.
  • the signal having the frequency cos (f0 ⁇ fd) and the output of the oscillating unit 30 are calculated by the I / Q type mixer unit 38, and the calculation result is processed by the signal processing unit 42. It is possible to determine the moving direction of the foreign object 50 such as whether the 50 is approaching or moving away from the foreign object detection unit 14.
  • the movement of the foreign matter 50 can be continuously monitored. That is, the speed and moving direction of the foreign object 50 can be detected.
  • step S ⁇ b> 3 the foreign object detection unit 14 starts the foreign object detection operation, and the detection result of the foreign object detection unit 14 is input to the control unit 16.
  • step S4 power supply from the primary coil unit 12 to the secondary coil unit 18 is started, and the detection result in step S3 is stored in the control unit 16 as an initial value.
  • step S5 the control unit 16 compares the new detection result by the foreign object detection unit 14 with the initial value, and determines whether or not the foreign object has entered. If it is determined in step S5 that a foreign object has entered (YES in S5), the process proceeds to the foreign object intrusion process in step S6.
  • step S6 in order to grasp the moving direction of the foreign object, the moving path of the foreign object from the start of power supply is confirmed, and the transmission power control and the foreign object intrusion process for canceling the control are performed.
  • FIG. 8 shows a flowchart of the foreign object intrusion process.
  • step S21 it is determined whether or not a foreign object is in the foreign object intrusion detection area A3 (whether or not it has entered). If the foreign object is in the foreign object intrusion detection range (YES in S21), it is determined in step S22 whether the foreign object is heading toward the electromagnetic field region A1. That is, the foreign object detection unit 14 constantly monitors the electromagnetic field area A1 and the situation in the vicinity thereof from the start of power supply, and grasps the direction in which the foreign object enters when the foreign object enters the foreign object intrusion detection area A3. Then, it is determined whether or not the foreign object is moving from the foreign object intrusion detection area A3 toward the electromagnetic field area A1.
  • step S22 If it is determined in step S22 that the foreign object is heading toward the electromagnetic field region A1 (YES in S22), the process proceeds to step S23. On the other hand, when it is determined that the foreign object is not directed toward the electromagnetic field region A1 (NO limb of step 22), the process returns to step S21.
  • step S23 it is determined whether or not the foreign matter has entered the power control area A2. If it is determined that the foreign object has entered the power control range (YES in S23), the process proceeds to step S24. If it is determined that the foreign object has not entered the power control area A2 (NO in S23), the process proceeds to step S21. Return.
  • step S24 the control unit 16 performs control to reduce the transmission power from the primary coil unit 12 to the secondary coil unit 18 by a predetermined amount (for example, 1/2) or to stop power transmission.
  • a predetermined amount for example, 1/2
  • step S25 it is determined whether or not the foreign object is in the power control area A2. While it is determined that the foreign object is in the power control area A2 (YES in S25), the determination in step S25 is repeated. On the other hand, if it is determined that there is no foreign object in the power control area A2 (NO in S25), the transmission power control is canceled in step S26, and then the process returns to step S21.
  • step S21 If it is determined in step S21 that there is no foreign object in the foreign object intrusion detection area A3 (NO in S21), the foreign object intrusion process described above proceeds to step S27 and ends.
  • step S5 if it is determined in step S5 that no foreign substance has entered (NO in S5), it is determined in step S7 whether or not charging has been completed.
  • step S7 if charging is not completed (NO in S7), the process returns to step S5. If charging is completed (YES in S7), power supply is terminated in step S8. At the same time, the foreign object detection operation is terminated.
  • the power feeding device 2 includes the Doppler sensor as the foreign object detection unit 14 that can detect the movement of the object around the cover 111, and therefore between the primary coil unit 12 and the secondary coil unit 18. It is possible to reliably detect the entry of foreign matter.
  • the Doppler sensor is installed at a position lower than the primary magnetic core 112, the Doppler sensor is less susceptible to the magnetic field 44.
  • the user may be notified of the entry of the foreign object by display or sound.
  • a foreign object intrusion may be notified by the speaker 52 of the power feeding device 2 shown in FIG.
  • the foreign matter detector 14 may be provided in the power receiving device 4.
  • the foreign object detection unit 14 may be provided in both the power feeding device 2 and the power receiving device 4. In this case as well, foreign matter can be reliably detected.
  • the power receiving device 4 includes a secondary coil 103, an insulating unit 108, a secondary magnetic core 113, a substrate 110, a cover 111, and the like.
  • the foreign matter detection unit 14 may be disposed at a position opposite to the secondary coil 103 when viewed from the secondary magnetic core 113 in the direction from the secondary magnetic core 113 to the secondary coil 103.
  • the power receiving device 4 is provided with the foreign matter detection unit 14 at a position lower than the secondary magnetic core 113, that is, below the boundary line 46 (side closer to the substrate 110). .
  • the Doppler sensor is used as the foreign matter detection unit 14, an infrared sensor, an ultrasonic sensor, or the like may be used instead of the Doppler sensor.
  • the coil used in the non-contact charging apparatus may be a plate type or solenoid type coil.
  • the non-contact charging device of the present invention can reliably detect foreign matter that has entered near the electromagnetic field region during power feeding from the power feeding device to the power receiving device, for example, a person or an object may approach carelessly or accidentally. This is useful for power supply to a power receiving device of an electric propulsion vehicle.
  • Power feeding device 4 Power receiving device 14 Foreign matter detection unit (detection unit), Doppler sensor 102 Primary coil 103 Secondary coil 111 Cover 112 Primary magnetic core 113 Secondary magnetic core

Abstract

La présente invention se rapporte à un appareil de charge sans contact qui est pourvu d'un appareil d'alimentation électrique (2) qui fournit sans contact un courant à un appareil de réception de courant (4). L'appareil d'alimentation électrique (2) est pourvu : d'une bobine primaire (102) qui génère un flux magnétique, un courant alternatif étant fourni à cette dernière ; d'un couvercle (111) qui recouvre la bobine primaire (102) ; et d'une unité de détection (14) qui détecte le mouvement d'un objet qui se trouve à la périphérie du couvercle (111).
PCT/JP2012/006921 2011-10-31 2012-10-29 Appareil de charge sans contact WO2013065283A1 (fr)

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JP2011238360A JP2015008552A (ja) 2011-10-31 2011-10-31 非接触充電装置
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JP2015104218A (ja) * 2013-11-25 2015-06-04 小島プレス工業株式会社 車両用非接触充電ユニット
CN105048528A (zh) * 2014-05-02 2015-11-11 福特全球技术公司 车辆电池充电系统和方法
JP2016526366A (ja) * 2013-05-10 2016-09-01 クアルコム，インコーポレイテッド 車両の下の動いている物体の存在を検出するためのシステムおよび方法
JP2017517716A (ja) * 2014-03-17 2017-06-29 クアルコム，インコーポレイテッド 所定の空間におけるレーダーに基づく物体の検出のためのシステム、方法、および装置
JP2017135898A (ja) * 2016-01-29 2017-08-03 日立マクセル株式会社 無線給電システム
US10773596B2 (en) 2012-07-19 2020-09-15 Ford Global Technologies, Llc Vehicle battery charging system and method

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JP6129890B2 (ja) * 2015-02-25 2017-05-17 本田技研工業株式会社 受電体及び該受電体を備える車両
JP6819339B2 (ja) 2017-02-14 2021-01-27 株式会社Ihi 非接触給電システムの異物検出装置

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WO2012090341A1 (fr) * 2010-12-28 2012-07-05 パナソニック株式会社 Dispositif de contrôle du courant électrique pour un dispositif de charge sans contact

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
US10773596B2 (en) 2012-07-19 2020-09-15 Ford Global Technologies, Llc Vehicle battery charging system and method
JP2016526366A (ja) * 2013-05-10 2016-09-01 クアルコム，インコーポレイテッド 車両の下の動いている物体の存在を検出するためのシステムおよび方法
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JP2017517716A (ja) * 2014-03-17 2017-06-29 クアルコム，インコーポレイテッド 所定の空間におけるレーダーに基づく物体の検出のためのシステム、方法、および装置
CN105048528A (zh) * 2014-05-02 2015-11-11 福特全球技术公司 车辆电池充电系统和方法
JP2017135898A (ja) * 2016-01-29 2017-08-03 日立マクセル株式会社 無線給電システム

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