WO2012121184A1 - Système de fourniture d'énergie sans contact à un corps mobile - Google Patents

Système de fourniture d'énergie sans contact à un corps mobile Download PDF

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Publication number
WO2012121184A1
WO2012121184A1 PCT/JP2012/055495 JP2012055495W WO2012121184A1 WO 2012121184 A1 WO2012121184 A1 WO 2012121184A1 JP 2012055495 W JP2012055495 W JP 2012055495W WO 2012121184 A1 WO2012121184 A1 WO 2012121184A1
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Prior art keywords
power
side coil
magnetic field
coil
power transmission
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PCT/JP2012/055495
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English (en)
Japanese (ja)
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福田　浩司
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日本電気株式会社
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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
    • 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
    • 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
    • B60L53/305—Communication interfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/35—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles
    • B60L53/38—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles specially adapted for charging by inductive energy transfer
    • B60L53/39—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles specially adapted for charging by inductive energy transfer with position-responsive activation of primary coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—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
    • 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
    • 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]
    • 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
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Definitions

  • the present invention relates to a non-contact power feeding system to a moving body, and more particularly to a power feeding system that supplies power in a non-contact manner by magnetic field coupling to the moving body.
  • the electric vehicle includes an electric motor that generates a driving force and a power storage device that can repeatedly store electric power to supply electric power to the electric motor.
  • a method is known in which power is supplied to a power storage device by using a power cable provided in a house or the like and using a charging cable. From the viewpoint of convenience and safety, it has been devised to supply power to the storage battery by non-contact power transmission using the magnetic field resonance phenomenon of the coil as in Non-Patent Document 1.
  • a power feeding method using an electromagnetic induction phenomenon as described in Patent Document 1 and Patent Document 2 has also been devised.
  • non-contact power transmission using a magnetic field resonance phenomenon or electromagnetic induction phenomenon alignment of a power transmission side coil and a power reception side coil is important in power transmission efficiency.
  • the influence of the relative position between the power transmission side coil and the power reception side coil is relatively small in contactless power transmission using the magnetic field resonance phenomenon.
  • the power transmission efficiency decreases when the relative position of the coil is greatly deviated. For this reason, when using non-contact power transmission as a power feeding device to a moving body, a mechanism for adjusting the position between the power receiving side coil and the power transmitting side coil is necessary.
  • JP 2010-98807 A Japanese Patent No. 4356844 Japanese Patent No. 4442517
  • Patent Document 1 describes a power feeding system that performs non-contact power feeding by aligning a moving device that includes a secondary coil that is electromagnetically coupled to a primary coil with respect to a power feeding device that includes a primary coil.
  • FIG. 5A is an overall view for explaining the configuration of the non-contact power feeding device of Patent Document 3, and FIG. 5B is a graph showing power feeding efficiency E.
  • the non-contact power feeding device of Patent Document 3 includes a primary coil 101, a control unit 100, a power supply circuit 101a, a communication unit 102, a power feeding state obtaining unit 103, a power feeding efficiency obtaining unit 104, a positioning unit 105, a motor 105a, and a retry instruction unit 106. It has.
  • the power supply state acquisition unit 103 includes an ammeter 103 a and a voltmeter 103 b that measure the current value and voltage value of the primary coil 101.
  • the moving device includes a secondary coil 111, a control unit 110, a power supply circuit 111a, a battery 111b, a communication unit 112, a power receiving state acquisition unit 113, and a traveling unit 114.
  • the power receiving state acquisition unit 113 includes an ammeter 113a and a voltmeter 113b that measure the current value and voltage value of the secondary coil 111.
  • the power supply efficiency acquisition means 104 calculates the electric power in each coil from the voltage value and current value of both the primary coil 101 and the secondary coil 111.
  • the power supply efficiency E is calculated from the power ratio thus calculated. As shown in FIG. 5B, the power supply efficiency E changes as indicated by a curve a.
  • the position where the curve a shows a peak is when the positions of the primary coil 101 and the secondary coil 111 coincide.
  • the power supply efficiency E is monitored, and the positional deviation between the primary coil 101 and the secondary coil 111 is corrected so that the power supply efficiency E reaches a peak. Yes.
  • the object of the present invention is to detect in which direction the central axis of the coil is shifted between the power transmission side coil and the power reception side coil, and to reduce the time required for alignment control of the central axis of the coil, and to contact the moving body It is to provide a power feeding system.
  • a non-contact power feeding system to a moving body supplies power from the power transmission side coil in a non-contact manner to a moving body including a power receiving side coil that is electromagnetically coupled to the power transmission side coil.
  • a contactless power feeding system to a moving body wherein the electromagnetic field intensity distribution generated by the power transmission side coil is detected at at least three positions around the power reception side coil, and the electromagnetic fields at the plurality of positions are detected. The positions of the power transmission side coil and the power reception side coil are adjusted so that the intensity values of the power transmission side coil and the power reception side coil coincide with each other.
  • the central axis of the coil is shifted in which direction the coil on the power transmission side and the coil on the power reception side are shifted from the intensity distribution of the electromagnetic field generated by the power transmission side coil detected at at least three positions around the coil on the power reception side. Can be detected.
  • position adjustment between the coils is necessary for trial and error, whereas in the present invention, correction amounts in the X direction and the Y direction are calculated by one measurement, and the position is corrected at a time. As a result, the time for alignment control of the central axis of the coil can be shortened.
  • FIG. 1 is an overall view showing a non-contact power feeding system to a moving body according to an embodiment of the present invention.
  • 2A is an explanatory diagram for explaining the arrangement of the power transmission side coil 11 and the magnetic field sensor unit 12 (12a, 12b, 12c) of FIG. 1
  • FIG. 2B is the power transmission side of the non-contact power feeding system of FIG. 5 is a flowchart for explaining an operation of aligning the central axes of a coil 21 and a power receiving coil 11.
  • FIG. 3 is an image diagram for explaining the positional relationship between the power reception side coil 11 and the magnetic field strength distribution generated by the power transmission side coil 21.
  • FIG. 4 is a conceptual diagram for generalizing and explaining the case where the sensor units are arranged in a circle at regular intervals.
  • FIG. 5A is an overall view for explaining the configuration of the non-contact power feeding device of Patent Document 3
  • FIG. 5B is a graph showing power feeding efficiency E.
  • FIG. 1 is an overall view showing a non-contact power feeding system to a moving body according to an embodiment of the present invention.
  • 2A is an explanatory diagram for explaining the positional relationship between the power transmission side coil 11 and the magnetic field sensor unit 12 of FIG. 1
  • FIG. 2B is a power transmission side coil 21 and a power reception side coil of the non-contact power feeding system of FIG. 11 is a flowchart for explaining an alignment operation of 11 central axes.
  • the power supply device 20 and the moving body 10 are each provided with a resonance coil.
  • the resonance coil of the power supply device 20 is referred to as a power transmission side coil 21, and the resonance coil of the mobile body 10 is referred to as a power reception side coil 11.
  • the contactless power supply system of the present embodiment includes a power supply device 20 and a moving body 10 that receives power supply from the power supply device 20 in a contactless manner.
  • the power feeding device 20 includes a power transmission side coil 21, a coil position control device 23, an AC power supply 25, a transmitted power adjustment device 24, and a communication device 22.
  • the power feeding device 20 generates an electromagnetic wave having a frequency that flows from the AC power supply 25 and the transmission power adjustment device 24 to the power transmission side coil 21.
  • the transmission power adjustment device 24 adjusts the magnitude, frequency, and the like of the power sent to the power transmission side coil 21 based on the signal obtained from the communication device 22.
  • the coil position control device 23 adjusts the position of the power transmission side coil 21 based on the communication signal from the communication device 16 of the moving body 10. At this time, the position of the power transmission side coil 21 can be adjusted by adjusting the position of the power supply device 20 itself without changing the relative position between the power transmission side coil 21 and the power supply device 20. Alternatively, the relative position between the power transmission side coil 21 and the power reception side coil 11 can be adjusted by adjusting the position of the moving body 10.
  • the moving body 10 includes a power receiving coil 11, a magnetic field sensor unit 12, a power storage mechanism 13, an electromagnetic field distribution calculation microcomputer 14, a system / communication control microcomputer 15, and a communication device 16. Further, the electromagnetic field distribution calculation microcomputer and the system / communication control microcomputer may function as both in one microcomputer.
  • a magnetic field sensor unit 12 is disposed around the power receiving side coil 11 of the moving body 10. In the present embodiment, as shown in FIG. 2A, the three magnetic field sensor units 12 a, 12 b, and 12 c are arranged around the power receiving side coil 11 so as to be at the apex of an equilateral triangle. In FIG. 2A, the positions of the magnetic field sensor units 12a, 12b, and 12c are indicated by black squares.
  • the power storage mechanism 13 of the moving body 10 rectifies the AC power obtained by the resonance coil 11 and stores it as power in the storage battery. Information such as the magnitude of the obtained power is sent from the power storage mechanism 13 to the system / communication control microcomputer 15.
  • the electromagnetic field distribution calculation microcomputer 14 calculates magnetic field information obtained from the three magnetic field sensor units 12 arranged around the power receiving coil 11. Further, the electromagnetic field distribution calculation microcomputer 14 sends the calculated electromagnetic field distribution information to the system / communication control microcomputer 15. From the obtained information, the system / communication control microcomputer 15 communicates the position control of the moving body 10 for positioning the resonance coils, the position control of the power supply device 20, and the exchange of information on the power transmission efficiency with the power supply device 20. This is done via the device 16.
  • a pilot signal is emitted from the communication device 16 of the mobile body 10 or the communication device 22 of the power feeding device 20.
  • the communication device 22 of the power feeding device 20 or the communication device 16 of the moving body 10 detects the released pilot signal, it detects that the power feeding device 20 and the moving body 10 have approached.
  • the resonance frequency of the two resonance coils is adjusted by the power transmission adjustment device 24 from the AC power supply 25 of the power supply device 20, and a magnetic field is generated from the power transmission side coil 21. generate. It is not necessary to use a magnetic field at the resonance frequency at the time of position detection.
  • the magnetic field is measured by the three magnetic field sensor units 12a, 12b, and 12c in step S1.
  • the magnetic field sensor units 12a, 12b, and 12c measure a magnetic field in a direction parallel to the central axis of the power transmission side coil 21 at the position where the magnetic field sensor units 12a, 12b, and 12c are arranged.
  • step S2 it is confirmed whether or not the three measured magnetic field strength values match within an allowable error range.
  • the allowable error is an allowable value of an error due to a magnetic field disturbance due to a surrounding structure or a measurement error.
  • the three magnetic field strength values match, it is determined that the central axis of the power transmission side coil 21 and the central axis of the power reception side coil 11 are aligned, and there is no positional deviation.
  • Power is transmitted to the power receiving side coil 11 that is electromagnetically coupled to the coil 21 in a non-contact manner. When there is no displacement, the maximum power transmission efficiency is obtained.
  • the power transmitted to the power receiving side coil 11 is sent to the power storage mechanism 13 of the moving body 10 and stored.
  • the accumulated electric power is supplied to an electric motor in the moving body 10.
  • step S2 When the measured three magnetic field strength values do not match in step S2, it is considered that the position of the central axis of the power transmission side coil 21 and the central axis of the power reception side coil 11 is shifted, and the system is determined in step S3.
  • the communication control microcomputer 15 calculates the movement amount. Based on the calculated movement amount, the system / communication control microcomputer 15 adjusts the position of the power transmission side coil 21 of the power supply apparatus 20 via the communication apparatus 16 in step S4. Alternatively, the position of the power feeding device 20 itself is adjusted without changing the relative position between the power transmission side coil 21 and the power feeding device 20. When the power feeding device 20 is moved, information on the positional deviation of the central axis is transmitted to the coil position control device through the communication device 16 and the power feeding device 20 is moved.
  • step S1 the magnetic field is measured by the three magnetic field sensor units 12a, 12b, and 12c.
  • step S2 it is confirmed whether or not the three measured magnetic field strength values match.
  • the alignment between the power transmission side coil 21 and the power reception side coil 11 is ideally completed by one movement. If necessary, the coefficient for calculating the movement amount is corrected and calculated again. Also, if there is no match after several trials, it informs you that there is an abnormality in the system and the surrounding environment.
  • the magnetic field sensor unit When the magnetic field intensity distribution is a pattern that decreases substantially monotonously from the central axis of the power supply side coil 22, the magnetic field sensor unit is arranged around the power reception side coil 11 so as to be at the apex of an equilateral triangle. The deviation of the central axis of the coil can be detected from the magnetic field strength distribution. The tendency of the magnetic field distribution is the same even when the resonance frequency is not used.
  • the movement amount in step S3 is, for example, the movement amount ⁇ x in the x direction is a ⁇ (F1 ⁇ F2) ⁇ sin 30 °, and the movement amount ⁇ y in the y direction is calculated by a ⁇ (F1 ⁇ (F2 + F3) ⁇ cos30 °).
  • a is a certain proportional constant
  • F1, F2, and F3 are the magnetic field intensity values detected by the magnetic field sensor units 12a, 12b, and 12c, respectively
  • the angle is a plane coordinate system centered on the center of each sensor unit.
  • the angles when the angular position of F3 can be represented by 90 °, 210 °, and 330 ° are shown.
  • the magnetic field sensor 12 that measures the central axis of the power transmission side coil 21 and the central axis of the power reception side coil 11 around the power reception side coil 11 measures.
  • the alignment can be based on the intensity value.
  • information on the magnetic field distribution is obtained from the three magnetic field sensor units 12a, 12b, and 12c, thereby grasping in which direction the central axes of the coils are shifted from each other, thereby eliminating the positional shift of the central axes.
  • the position of the coil can be adjusted.
  • the present invention is not limited to this.
  • the magnetic field sensor unit 12 has been described in the case where the magnetic field sensor unit 12 is arranged around the power receiving side coil 11 so as to be located at the apex of an equilateral triangle. It is also possible to arrange them so that they are at the positions of the vertices. Considering the magnetic field intensity distribution generated by the power transmission side coil 21 and the positional relationship between the magnetic field sensor units 12, the power value measured by the magnetic field sensor unit 12 is corrected, and the power transmission side coil is matched so that the corrected intensity values match. What is necessary is just to adjust the position of 21 and the power receiving side coil 11. FIG.
  • the minimum number of sensor units that can determine the amount of movement ⁇ x in the x direction and the amount of movement ⁇ y in the y direction is three, and four or more magnetic field sensor units 12 are arranged around the power receiving side coil 11.
  • the magnetic field strength value may be detected.
  • FIG. 4 is a conceptual diagram for generalizing and explaining the case where the sensor units are arranged in a circle at regular intervals.
  • the amount of movement ⁇ x in the x direction is And the amount of movement ⁇ y in the y direction is Is calculated by
  • a is a proportional constant
  • Fi (x, y) is a magnetic field strength value measured by the sensor unit at each position.
  • the angle ⁇ n is The angle determined by the number n of sensor units to be arranged.
  • the movement amount ⁇ x in the x direction and the movement amount ⁇ y in the y direction are calculated. Based on this, it is sufficient to move.
  • an electric field sensor can be used instead of the magnetic field sensor. When detecting the electric field, it is preferable to look at the magnetic field component in the axial direction of the resonance coil, in which the influence of the current excited in the power receiving coil 11 is difficult to see.
  • an electric field sensor and a magnetic field sensor it is possible to use an optical electric field probe (EO probe) and an optical magnetic field probe (MO probe) that are less invasive to surrounding electromagnetic fields.
  • the EO probe uses an electro-optic crystal
  • the MO probe uses a magneto-optic crystal.
  • the positioning of the power transmission side coil 21 and the power reception side coil 11 according to the embodiment of the present invention described above is performed by detecting the pilot signal from the communication device 16 of the mobile body 10 or the communication device 22 of the power feeding device 20. And the power feeding device 20 is approached. Coarse alignment between the moving body 10 and the power feeding device 20 can use wireless communication by such a communication device.
  • the moving body 10 is an electric vehicle
  • This rough alignment may be as accurate as entering the garage by current level drivers.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention concerne un système de fourniture d'énergie sans contact à un corps mobile, capable de détecter la direction dans laquelle les axes centraux d'une bobine côté émission d'énergie et d'une bobine côté réception d'énergie sont décalées l'une de l'autre et de réduire le temps nécessaire à contrôler l'alignement des axes centraux des bobines. La distribution de l'intensité du champ magnétique généré par la bobine côté émission d'énergie est détectée en de multiples positions autour de la bobine côté réception d'énergie et les positions de la bobine côté émission d'énergie et de la bobine côté réception d'énergie sont ajustées de telle sorte que les valeurs de l'intensité du champ magnétique aux multiples positions coïncident les unes avec les autres.
PCT/JP2012/055495 2011-03-10 2012-02-28 Système de fourniture d'énergie sans contact à un corps mobile WO2012121184A1 (fr)

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CN113595255A (zh) * 2021-07-14 2021-11-02 Oppo广东移动通信有限公司 调整线圈位置的方法、移动终端及存储介质

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