JP2010183813A - Resonance type non-contact charging system - Google Patents

Resonance type non-contact charging system Download PDF

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JP2010183813A
JP2010183813A JP2009027673A JP2009027673A JP2010183813A JP 2010183813 A JP2010183813 A JP 2010183813A JP 2009027673 A JP2009027673 A JP 2009027673A JP 2009027673 A JP2009027673 A JP 2009027673A JP 2010183813 A JP2010183813 A JP 2010183813A
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Prior art keywords
secondary
coil
primary
resonance coil
vehicle
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JP2009027673A
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Japanese (ja)
Inventor
Shinji Ichikawa
Tetsuhiro Ishikawa
Kenichi Nakada
Shinpei Sakota
Sadanori Suzuki
Kazuyoshi Takada
Yukihiro Yamamoto
健一 中田
幸宏 山本
真士 市川
哲浩 石川
慎平 迫田
定典 鈴木
和良 高田
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Toyota Industries Corp
Toyota Motor Corp
トヨタ自動車株式会社
株式会社豊田自動織機
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Priority to JP2009027673A priority Critical patent/JP2010183813A/en
Publication of JP2010183813A publication Critical patent/JP2010183813A/en
Application status is Pending legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30Constructional details of charging stations
    • B60L53/35Means for automatically adjusting the relative position of charging devices and vehicles
    • B60L53/36Means for automatically adjusting the relative position of charging devices and vehicles by positioning the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10Methods 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
    • B60L53/12Inductive energy transfer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30Constructional details of charging stations
    • B60L53/305Communication interfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L2210/00Converter types
    • B60L2210/30AC to DC converters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/80Time limits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7005Batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y02T10/7088Charging stations
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7241DC to AC or AC to DC power conversion
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/121Electric charging stations by conductive energy transmission
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/122Electric charging stations by inductive energy transmission
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/125Alignment between the vehicle and the charging station
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/127Converters or inverters for charging
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/128Energy exchange control or determination
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/14Plug-in electric vehicles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles
    • Y02T90/163Information or communication technologies related to charging of electric vehicle

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resonance type non-contact charging system capable of efficiently charging a secondary battery installed on a vehicle without providing a moving means for moving a primary resonance coil. <P>SOLUTION: A power feeding side facility 10 includes a primary coil 12 selectively connected to an AC power supply unit 11 and a resistance R via a switch SW1, and a primary side resonance coil 13. An in-vehicle side facility 20 includes two secondary side resonance coils 21a, 21b, two secondary coils 22a, 22b, a charger 23, a secondary battery 24 connected to the charger 23, and a distance measuring AC power supply unit 27, wherein the secondary coils 22a, 22b are selectively connected to the distance measuring AC power supply unit 27 and the charger 23 through the switches SW2 and SW3. The distance between each of the secondary side resonance coils 21a, 21b and the primary side resonance coil 13 is estimated in a state that the secondary coils 22a, 22b are connected to the distance measuring AC power supply unit 27 and the resistance R is connected to the primary coil 12, and the positional relation between the power feeding side facility 10 and the in-vehicle side facility 20 is estimated from the estimated distance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resonance-type contactless charging system, and more particularly to a resonance-type contactless charging system that charges a secondary battery mounted on a vehicle in a contactless manner.

  A resonance method has been proposed as a technique for power transmission without contact (for example, Patent Document 1). In this power transmission system using the resonance method, as shown in FIG. 9, two copper wire coils 51 and 52 are arranged in a separated state, and one copper wire coil (primary resonance coil) 51 is connected to the other copper wire. Electric power is transmitted to the coil (secondary resonance coil) 52 by electromagnetic field resonance. Specifically, the magnetic field generated by the primary coil 54 connected to the AC power supply 53 is enhanced by magnetic field resonance by the copper wire coils 51 and 52, and the secondary coil 55 generates the magnetic field in the vicinity of the enhanced copper wire coil 52. Electric power is extracted using electromagnetic induction and supplied to the load 56. And when the copper wire coils 51 and 52 of radius 30cm are arrange | positioned 2 m apart, it has been confirmed that the 60W electric lamp as the load 56 can be lighted.

  There has also been proposed a non-contact power feeding device that can efficiently charge a battery of an electric vehicle without contact (for example, Patent Document 2). The non-contact power feeding device of Patent Document 2 has a primary coil that is electromagnetically coupled to a secondary coil on the electric vehicle side on the fixed side, and feeds power from the primary coil side to the secondary coil side. Positioning means is provided for moving the position of the primary coil so as to maximize the power supply efficiency from the power supply state on the primary coil side and the power reception state on the secondary coil side.

International Patent Publication WO / 2007/008646 A2 JP 2006-345588 A

  However, Patent Document 1 does not disclose a specific configuration when the resonance type non-contact power transmission method is used for charging a secondary battery mounted on a vehicle. Further, the non-contact power feeding device of Patent Document 2 requires positioning means (moving means) for moving the position of the primary coil provided on the fixed side, and the configuration becomes complicated.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a secondary mounted on a vehicle without providing a moving means for moving a primary side resonance coil provided on a power feeding side. An object of the present invention is to provide a resonance type non-contact charging system capable of efficiently charging a battery.

  In order to achieve the above-described object, the invention according to claim 1 is an AC power source, a power supply side facility including a primary side resonance coil that receives power supply from the AC power source, and a primary side resonance coil. Resonance including a secondary resonance coil that receives power by magnetic field resonance, a charger that receives power supply from the secondary resonance coil, and a vehicle-mounted facility that includes a secondary battery connected to the charger. Type non-contact charging system. A plurality of at least one of the primary side resonance coil and the secondary side resonance coil are provided, and distance estimation means for estimating a distance between the primary side resonance coil and the secondary side resonance coil; and the distance estimation Position estimation means for estimating a positional relationship between the power supply side equipment and the in-vehicle side equipment from the distance estimated by the means. Here, the “AC power supply” means a power supply that outputs an AC voltage, and includes an output that converts a DC input from a DC power supply into an AC.

  In this invention, when the vehicle moves to the charging position and parks (stops), the distance between the secondary resonance coil and the primary resonance coil is estimated by the distance estimation means. Then, the positional relationship between the power supply side equipment and the in-vehicle side equipment is estimated from the estimated distance by the position estimation means. The position estimating means can estimate the positional relationship between the power supply side equipment and the in-vehicle side equipment based on at least the estimated distance between the two sets of primary side resonance coils and secondary side resonance coils. Therefore, it can be determined whether or not the power supply side equipment and the in-vehicle side equipment are in a positional relationship that allows efficient charging. Then, charging is performed in a state where the vehicle is moved until the positional relationship is efficiently charged, so that it is mounted on the vehicle without providing a moving means for moving the primary side resonance coil provided on the power feeding side. The secondary battery can be charged efficiently.

  According to a second aspect of the present invention, in the first aspect of the invention, the power supply side facility is coupled to the primary resonance coil by electromagnetic induction and is selectively connected to the AC power source. The distance estimating means includes the primary resonance coil and the voltage based on at least one of a voltage value detected from the primary coil and a voltage value detected from the secondary resonance coil. Estimate the distance between the secondary resonance coils.

  In the present invention, as a method of estimating the distance, a method of estimating from the voltage of at least one of the primary coil and the secondary resonance coil is employed. For example, when estimating from the voltage of the primary coil, a relationship between the voltage of the primary coil and the distance between the primary side resonance coil and the secondary side resonance coil is obtained by a test and is estimated using the relationship. To do. When estimating from the voltage of the secondary side resonance coil, the relationship between the voltage of the secondary side resonance coil and the distance between the primary side resonance coil and the secondary side resonance coil is obtained by a test, and the relationship is used. To estimate. Moreover, when estimating from the voltage of both a primary coil and a secondary side resonance coil, it estimates from the electric power transmission efficiency calculated | required from both voltage values. Therefore, the distance can be estimated without a secondary coil.

  According to a third aspect of the present invention, in the first aspect of the invention, the power supply side facility is coupled to the primary resonance coil by electromagnetic induction and is selectively connected to the AC power source. The on-vehicle equipment includes a secondary coil that is coupled to the secondary resonance coil by electromagnetic induction and is selectively connected to the charger. The distance estimation means includes the primary resonance coil and the secondary resonance coil based on at least one of a voltage value output from the primary coil and a voltage value detected from the secondary resonance coil. Estimate the distance between.

  In the present invention, as a method of estimating the distance, “a method of estimating from the voltage of at least one of the primary coil and the secondary coil is adopted. For example, when estimating from the voltage of the primary coil, the primary coil. The relationship between the voltage of the primary coil and the distance between the primary side resonance coil and the secondary side resonance coil is obtained by a test and is estimated using the relationship. The relationship between the voltage of the primary coil and the distance between the primary side resonance coil and the secondary side resonance coil is obtained by a test, and is estimated using the relationship, and from the voltages of both the primary coil and the secondary coil. When estimating, it estimates from the power transmission efficiency calculated | required from both voltage values.

  The invention according to claim 4 is the invention according to any one of claims 1 to 4, wherein the on-vehicle equipment includes a first secondary resonance coil and a second secondary resonance coil. The position estimating means includes a distance between the first secondary resonance coil and the primary resonance coil estimated by the distance estimation means, and the second secondary resonance coil and the first The positional relationship between the power supply side equipment and the in-vehicle side equipment is estimated from the distance to the secondary resonance coil.

  In this invention, when the vehicle moves to the charging position and parks (stops), the distance between the first secondary resonance coil and the primary resonance coil estimated by the distance estimation means and the second secondary side are estimated. A distance between the resonance coil and the primary resonance coil is estimated. Then, the position estimation unit supplies power from the distance between the first secondary resonance coil and the primary resonance coil estimated by the distance estimation unit and the distance between the second secondary resonance coil and the primary resonance coil. The positional relationship between the side equipment and the in-vehicle side equipment is estimated. Therefore, based on the estimated positional relationship between the power supply side equipment and the in-vehicle side equipment, the vehicle can be easily moved to the charging position, and moving means for moving the primary resonance coil provided on the power supply side is provided. Without providing, the secondary battery mounted on the vehicle can be charged efficiently.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the power supply side equipment includes a first primary side resonance coil and a second primary side resonance coil. The position estimating means includes a distance between the first primary resonance coil and the secondary resonance coil estimated by the distance estimation means, and the second primary resonance coil and the 2 The positional relationship between the power supply side equipment and the in-vehicle side equipment is estimated from the distance to the secondary resonance coil.

  In this invention, when the vehicle moves to the charging position and parks (stops), the distance between the first primary resonance coil and the secondary resonance coil estimated by the distance estimation means and the second primary side are estimated. A distance between the resonance coil and the secondary resonance coil is estimated. Then, the position estimation unit supplies power from the distance between the first primary resonance coil and the secondary resonance coil estimated by the distance estimation unit and the distance between the second primary resonance coil and the secondary resonance coil. The positional relationship between the side equipment and the in-vehicle side equipment is estimated. Therefore, based on the estimated positional relationship between the power supply side equipment and the in-vehicle side equipment, the vehicle can be easily moved to the charging position, and moving means for moving the primary resonance coil provided on the power supply side is provided. Without providing, the secondary battery mounted on the vehicle can be charged efficiently.

  The invention according to claim 6 is the invention according to any one of claims 3 to 5, wherein the resistor is selectively connected to the primary coil, and the secondary coil is selectively connected. A distance measuring AC power source, wherein the distance measuring AC power source is connected to each secondary coil and the resistor is connected to the primary coil from each secondary resonance coil. Power is transmitted to the primary resonance coil. The distance estimating means transmits a power value from the secondary resonance coil to the primary resonance coil and detects a voltage value detected from the secondary coil and from the secondary resonance coil to the primary resonance coil. A distance between the secondary resonance coil and the primary resonance coil is estimated based on at least one of the voltage values detected from the primary coil after transmitting power.

  In this invention, when the vehicle moves to the charging position and parks (stops), the AC power source for distance measurement is connected to each secondary coil and each secondary side resonance is connected with the resistance connected to the primary coil. Power is transmitted from the coil to the primary resonance coil. Based on at least one of the voltage value detected from the secondary coil and the voltage value detected from the primary coil, the distance between the secondary resonance coil and the primary resonance coil is estimated by the distance estimation means. Is done.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the vehicle on which the in-vehicle side equipment is mounted includes a parking assistance device, and is estimated by the position estimating means. Further, data indicating the positional relationship between the power supply side equipment and the in-vehicle side equipment is used in the parking assistance device. Here, the “parking support device” means a device that plays a role of reducing driver's steering operation when the vehicle is parked. The parking assist device includes, for example, an automatic parking device that performs automatic steering so that the driver stops at a target parking position based on shooting data of the camera without touching the steering wheel by a camera and a computer. There are devices for displaying the parking position and the current position of the vehicle. In this invention, the vehicle can be moved and parked at the charging position more easily.

  ADVANTAGE OF THE INVENTION According to this invention, the secondary battery mounted in the vehicle can be charged efficiently, without providing the moving means which moves the primary side resonance coil provided in the electric power feeding side.

The block diagram of the resonance-type non-contact charge system in 1st Embodiment. The schematic plan view which shows the relationship between the primary side resonance coil at the time of a vehicle moving to a charge position, and a secondary side resonance coil. The schematic diagram which shows the relationship between a primary side resonance coil and a secondary side resonance coil. The block diagram of the resonance type non-contact charge system in 2nd Embodiment. The block diagram of the resonance type non-contact charge system in 3rd Embodiment. The flowchart explaining an effect | action. (A) is a schematic top view which shows the relationship between the primary side resonance coil and secondary side resonance coil when a vehicle moves backward to a charge position, (b) is a schematic plan view at the time of moving forward. The schematic side view which shows the relationship between the primary side resonance coil and the secondary side resonance coil in the charge position of the vehicle in another embodiment. The block diagram of the non-contact electric power transmission apparatus of a prior art.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 schematically shows the configuration of a resonance type non-contact charging system. As shown in FIG. 1, the resonance-type non-contact charging system includes a power supply side facility (power transmission side facility) 10 provided on the ground side and an in-vehicle side facility 20 mounted on a vehicle 30. The power supply side equipment 10 includes an AC power supply 11 and a primary resonance coil 13 that receives power from the AC power supply 11. More specifically, the power supply side equipment 10 includes an AC power source 11, a primary coil 12, a primary side resonance coil 13, and a power source side controller 14. The primary coil 12 and the primary side resonance coil 13 are disposed so as to be coaxial. The primary coil 12 can be switched between a state connected to the resistor R via the switch SW <b> 1 and a state connected to the AC power supply 11. Primary coil 12 is coupled to primary resonance coil 13 by electromagnetic induction and is selectively connected to AC power supply 11 and resistor R.

  A voltage sensor 15 that detects a voltage across the resistor R, that is, an output voltage of the primary coil 12 in a state where the resistor R is connected to the primary coil 12, is connected to the resistor R. The detection signal of the voltage sensor 15 is input to the power supply side controller 14. A capacitor C is connected to the primary resonance coil 13. The AC power supply 11 is a power supply that outputs an AC voltage. The AC power supply 11 is configured to output an AC having a predetermined frequency (resonance frequency) under the control of the power supply controller 14.

  The in-vehicle side equipment 20 is connected to the first secondary resonance coil 21a and the second secondary resonance coil 21b, the two secondary coils 22a and 22b, and the secondary coils 22a and 22b, and generates electric power. A charger 23 that receives the supply, a secondary battery 24 connected to the charger 23, a charge controller 25, and a vehicle-side controller 26 are provided. Corresponding secondary resonance coils 21a, 21b and secondary coils 22a, 22b are arranged so as to be located on the same axis. The charger 23 includes a rectifier circuit (not shown) that rectifies the alternating current input from the secondary coils 22a and 22b, and a booster circuit that boosts the rectified direct current to a voltage suitable for charging the secondary battery 24. (Not shown). The charge controller 25 controls the switching element of the booster circuit of the charger 23 during charging. Each secondary coil 22a, 22b is configured to be selectively connectable to the charger 23 via the switches SW2, SW3. The secondary coils 22a and 22b are coupled to the first and second secondary resonance coils 21a and 21b by electromagnetic induction and are selectively connected to the charger 23. The in-vehicle equipment 20 includes a distance measurement AC power supply 27, and the distance measurement AC power supply 27 is configured to be selectively connectable to one of the two secondary coils 22a and 22b via the switches SW2 and SW3. Yes. The AC power supply 27 for distance measurement is configured to output AC power that is about two orders of magnitude smaller than the AC power supply 11 outputs during power transmission.

  The number of turns and the winding diameter of the primary coil 12, the primary side resonance coil 13, the secondary side resonance coils 21a and 21b, and the secondary coils 22a and 22b are appropriately set according to the magnitude of the electric power to be transmitted. Is done. In FIG. 1, the switches SW1, SW2, and SW3 indicate relay contacts. In FIG. 1, the contact of the relay is shown as a contact type, but a contactless relay using a semiconductor element may be used.

  The power supply controller 14 and the vehicle controller 26 can communicate with each other via a wireless communication device (not shown). The power supply side controller 14 includes a CPU and a memory. In the memory, the switch 30 is switched to a state in which the resistor R and the primary coil 12 are connected when the vehicle 30 including the in-vehicle side equipment 20 moves to the charging position. A control program for switching the switch SW1 to a state in which the AC power supply 11 and the primary coil 12 are connected during charging is stored. Further, the memory stores a control program for transmitting detected voltage data of the voltage sensor 15 to the vehicle-side controller 26 in a state where the resistor R is connected to the primary coil 12.

  The vehicle-side controller 26 includes a CPU and a memory. In the memory, the switches SW2 and SW3 are selectively connected to the two secondary coils 22a and 22b and the distance measuring AC power supply 27 when the vehicle 30 moves to the charging position. A control program for switching to a state in which the two secondary coils 22a and 22b are selectively connected to the charger 23 during charging is stored. In the memory, the secondary coils 22a and 22b are connected to the distance measuring AC power supply 27, respectively, and based on the detected voltage data of the voltage sensor 15 transmitted from the vehicle controller 26, the secondary resonance coils 21a and A control program for calculating (estimating) the distance between 21b and the primary resonance coil 13 is stored. The voltage sensor 15 and the vehicle-side controller 26 constitute distance estimation means. Further, in the memory, the positional relationship between the primary side resonance coil 13 and the two secondary side resonance coils 21a and 21b from the distance between the secondary side resonance coils 21a and 21b and the primary side resonance coil 13, that is, A control program for estimating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 is stored. The vehicle-side controller 26 also functions as position estimation means for estimating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20.

  The vehicle 30 includes a known automatic parking device 31 as a parking assistance device. The automatic parking device 31 is automatically steered by a computer (not shown) provided at the rear of the vehicle and a computer so that the driver parks (stops) at a target parking position based on the camera data without touching the steering wheel. I do. In this embodiment, when the vehicle 30 stops at the charging position, the automatic parking apparatus 31 replaces the captured data of the camera with the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 estimated by the position estimation means ( Automatic steering based on the position data).

  As shown in FIGS. 2 and 3, the first and second secondary resonance coils 21 a and 21 b are arranged on the left and right sides of the rear bottom portion of the vehicle 30 so that the central axis of the coil extends in the vertical direction of the vehicle 30. Is provided. The primary resonance coil 13 is positioned below the vehicle 30 stopped at the charging stop position in a hole formed on the ground so that the central axis of the coil extends in a direction perpendicular to the ground surface. Is provided. The opening of the hole is covered with a cover so as not to hinder the movement of the vehicle 30. The primary side resonance coil 13 and the secondary side resonance coils 21a and 21b are formed in the same manner by winding an electric wire in a spiral shape.

Next, the operation of the resonance type non-contact charging system configured as described above will be described.
When the secondary battery 24 mounted on the vehicle 30 is charged, the vehicle 30 needs to be parked (stopped) at the charging position where the primary resonance coil 13 of the power supply side equipment 10 is provided. When the vehicle 30 moves to the charging position, processing for estimating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 is performed jointly by the power supply side controller 14 and the vehicle side controller 26.

  When receiving a signal indicating that the vehicle 30 is moved to the charging position from the vehicle-side controller 26, the power-side controller 14 switches the switch SW1 so that the primary coil 12 is connected to the resistor R. The vehicle-side controller 26 keeps the switch SW3 connected to the distance measuring AC power supply 27 and switches the switch SW2 to a position connected to the secondary coil 22a. In this state, when an AC voltage having a resonance frequency is applied from the AC power supply 27 for distance measurement to the secondary coil 22a, a magnetic field is generated in the secondary coil 22a, and this magnetic field is generated between the primary resonance coil 13 and the secondary resonance. An alternating current is output from the primary coil 12 by electromagnetic induction by the magnetic field in the vicinity of the enhanced primary side resonance coil 13 that is enhanced by magnetic field resonance with the coil 21a. The output voltage of the primary coil 12 is detected by the voltage sensor 15, and the detected voltage data is transmitted to the vehicle controller 26 via the power supply controller 14. After storing the detected voltage data in the memory, the vehicle-side controller 26 switches the switch SW2 to a position where it is connected to the secondary coil 22b, and in the same manner as described above, the output voltage of the primary coil 12 by the voltage sensor 15 is switched. Detection voltage data is received from the power supply side controller 14. Then, the vehicle-side controller 26 estimates the distance between the primary side resonance coil 13 and the first and second secondary side resonance coils 21a and 21b based on both detection voltage data.

  The magnitude of the output voltage detected from the primary coil 12 has a certain relationship with the distance between the primary side resonance coil 13 and the first and second secondary side resonance coils 21a and 21b. Estimates the distance between each secondary resonance coil 21a, 21b and the primary resonance coil 13 based on the relationship stored in the memory. And the vehicle side controller 26 estimates the positional relationship of the electric power feeding side equipment 10 and the vehicle-mounted side equipment 20 from the distance of the two secondary side resonance coils 21a and 21b and the primary side resonance coil 13. FIG. Since the distance between the two secondary resonance coils 21a and 21b is known in advance, if the distance between the two secondary resonance coils 21a and 21b and the primary resonance coil 13 is known, the power supply side equipment 10 and the vehicle-mounted device are mounted. The positional relationship with the side equipment 20 is uniquely determined. It is determined from this positional relationship whether or not the vehicle 30 has arrived at a charging position where charging is performed efficiently. The vehicle-side controller 26 receives the detected voltage data from the power-side controller 14 by switching the connection state of the switch SW2 until the positional relationship between the power supply-side facility 10 and the in-vehicle-side facility 20 becomes a preset positional relationship. The process of estimating the positional relationship between the primary resonance coil 13 and the two secondary resonance coils 21a and 21b is repeated.

  In this embodiment, data on the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 is used for driving the automatic parking device 31. Therefore, when the driver parks the vehicle 30 at the charging position, the driver turns on the driving switch of the automatic parking device 31 and releases his / her hand from the handle. As a result, the automatic parking device 31 uses the vehicle 30 based on the data indicating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 estimated by the position estimation means (vehicle side controller 26) instead of the camera data. Continue automatic steering until parking at the charging position.

  When the vehicle 30 is parked at the charging position, the vehicle-side controller 26 switches to a state in which the switch SW3 is connected to the charger 23, and the switch SW2 is switched to the secondary-side resonance coil (in this embodiment, close to the primary-side resonance coil 13). The power supply request signal is transmitted to the power supply side controller 14 while keeping the state connected to the second secondary resonance coil 21 b). When receiving the power supply request signal, the power supply controller 14 switches the switch SW1 to a position where the primary coil 12 is connected to the AC power supply 11. Then, alternating current having a resonance frequency is output from the alternating current power supply 11.

  When an AC voltage having a resonance frequency is applied from the AC power source 11 to the primary coil 12, a magnetic field is generated in the primary coil 12, and this magnetic field is generated between the primary resonance coil 13 and the second secondary resonance coil 21b. Power is extracted from the magnetic field in the vicinity of the enhanced secondary resonance coil 21b by the secondary coil 22b using electromagnetic induction and supplied to the charger 23. The alternating current supplied to the charger 23 is rectified by a rectifier circuit, then boosted to a voltage suitable for charging the secondary battery 24 by a booster circuit, and charged to the secondary battery 24. For example, the charging controller 25 determines the completion of charging based on the elapsed time from the time when the voltage of the secondary battery 24 reaches a predetermined voltage, and transmits a charging completion signal to the power supply side controller 14 when the charging is completed. The power supply side controller 14 will complete | finish electric power transmission, if a charge completion signal is received.

According to this embodiment, the following effects can be obtained.
(1) The resonance-type non-contact charging system includes a power supply side facility 10 and an in-vehicle side facility 20. The power supply side equipment 10 includes an AC power supply 11 and a primary resonance coil 13 that receives power from the AC power supply 11. The in-vehicle equipment 20 includes a charger 23 that receives power from the secondary resonance coils 21 a and 21 b that receives power from the primary resonance coil 13 through magnetic field resonance, and a charger 23 that receives power from the secondary resonance coils 21 a and 21 b. A secondary battery 24 connected to the vessel 23 is provided. Further, the resonance type non-contact charging system is configured to estimate distance between the primary side resonance coil 13 and the first and second secondary side resonance coils 21a and 21b (voltage sensor 15 and vehicle side controller 26). And position estimation means (vehicle-side controller 26) for estimating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 from the distance estimated by the distance estimation means. Therefore, it can be determined whether or not the power supply side equipment 10 and the in-vehicle side equipment 20 are in a positional relationship that allows efficient charging. Then, charging is performed in a state where the vehicle 30 is moved until the positional relationship that allows efficient charging is achieved, so that the vehicle is not provided with a moving means for moving the primary resonance coil 13 provided on the power feeding side. The mounted secondary battery can be charged efficiently. Further, the primary coil 12, the primary resonance coil 13, the secondary resonance coil 21a, which are used for non-contact power transmission to estimate the distance between the primary resonance coil 13 and the secondary resonance coils 21a, 21b. Since 21b and the secondary coils 22a and 22b are used, the number of components newly provided for distance estimation can be reduced.

  (2) The resonance type non-contact charging system includes the primary resonance coil 13 and the two secondary sides based on the estimated distance between the two secondary resonance coils 21a and 21b and the primary resonance coil 13. Position estimation means (vehicle-side controller 26) for estimating the positional relationship with the resonance coils 21a and 21b is provided. Therefore, based on the estimated positional relationship between the primary resonance coil 13 and the two secondary resonance coils 21a and 21b, the vehicle 30 can be easily moved to the charging position and provided on the power supply side. The secondary battery 24 mounted on the vehicle 30 can be efficiently charged without providing a moving means for moving the primary resonance coil 13.

  (3) The power supply side equipment 10 is provided with a resistor R that can be selectively connected to the AC power supply 11 with respect to the primary coil 12, and the in-vehicle side equipment 20 can be selectively connected to the secondary coils 22a and 22b. A distance measuring AC power supply 27 is provided. The secondary-side resonance coils 21a and 21b and the primary-side resonance coil 13 are connected with the distance measuring AC power source 27 connected to the secondary coils 22a and 22b and the resistor R connected to the primary coil 12. Is estimated. Therefore, when estimating the distance between each secondary side resonance coil 21a, 21b and the primary side resonance coil 13, it is not influenced by the remaining capacity of the secondary battery 24.

  (4) The primary coil 12 is provided so as to be selectively connectable to the resistor R and the AC power supply 11 via the switch SW1, and the power supply side equipment 10 is in a state where the resistor R is connected to the primary coil 12. A voltage sensor 15 for detecting a voltage between both ends of R is provided. Accordingly, the vehicle-side controller 26 is connected to the primary-side resonance coil 13 and the secondary-side resonance coil 13 based on the detected voltage data between both ends of the resistor R in a state where the secondary-side resonance coils 21a and 21b are connected to the distance measuring AC power source 27. The positional relationship with the two secondary resonance coils 21a and 21b can be estimated.

  (5) The vehicle 30 includes a parking assistance device, and data indicating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 is used in the parking assistance device. Therefore, the vehicle 30 can be easily moved and parked at the charging position.

  (6) The vehicle 30 includes an automatic parking device 31 as a parking assist device, and the positions of the primary side resonance coil 13 and the secondary side resonance coils 21a and 21b estimated by the position estimation means (vehicle side controller 26). The automatic parking device 31 is driven based on the data indicating the relationship. Therefore, the vehicle 30 can be moved and parked to the charging position more easily.

  (7) Since the primary coil 12 and the primary side resonance coil 13 of the power supply side equipment 10 are provided in holes formed on the ground, the arrangement space of the primary coil 12 and the primary side resonance coil 13 is reduced. Securement becomes easy. Further, when the vehicle 30 moves to the charging position, interference between the power supply side equipment 10 and the vehicle 30 can be avoided, and the degree of freedom of the movement route is increased.

  (8) A capacitor C is connected to the primary resonance coil 13 and the secondary resonance coils 21a and 21b. Therefore, the resonance frequency can be lowered without increasing the number of turns of the primary resonance coil 13 and the secondary resonance coils 21a and 21b. Further, if the resonance frequency is the same, the primary resonance coil 13 and the secondary resonance coils 21a and 21b can be reduced in size compared to the case where the capacitor C is not connected.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In this embodiment, a plurality of primary resonance coils (two in this embodiment) are provided, one secondary resonance coil is provided, and a distance measuring AC power supply 27 is provided in the in-vehicle equipment 20. The point which is not provided is greatly different from the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the power supply side equipment 10 includes two primary coils 12a and 12b, and first and second primary side resonance coils 13a and 13b, and includes two primary coils 12a, 12b is provided so as to be selectively connectable to the AC power source 11 via the switch SW1. When the vehicle 30 moves to the charging position, the power supply side controller 14 switches the switch SW1 to a state in which the two primary coils 12a and 12b are selectively connected to the AC power supply 11 to charge the AC power supply 11 for charging. Control is performed to output an alternating current that is about two orders of magnitude smaller than the output during power transmission. The power supply side controller 14 transmits a signal notifying which of the two primary coils 12 a and 12 b is connected to the AC power supply 11 to the vehicle side controller 26. Moreover, the power supply side controller 14 connects the primary coil (for example, primary coil 12a) instruct | indicated with the command signal from the vehicle side controller 26 among the two primary coils 12a and 12b with the alternating current power supply 11 at the time of charge. Switch to the state you want.

  The in-vehicle equipment 20 includes one secondary resonance coil 21 and one secondary coil 22, and also includes a voltage sensor 28 that detects the output voltage of the secondary coil 22. When the vehicle 30 moves to the charging position, the vehicle-side controller 26 outputs a signal to that effect to the power supply-side controller 14. The power supply controller 14 sequentially switches the connection state of the switch SW1 and transmits a signal notifying which of the two primary coils 12a and 12b is connected to the AC power supply 11 to the vehicle controller 26. The vehicle-side controller 26 determines whether each of the two primary coils 12a and 12b transmitted from the power-side controller 14 is connected to the AC power source 11 and the detected voltage data of the voltage sensor 28. The distance between the primary side resonance coils 13a and 13b and the secondary side resonance coil 21 is calculated. In this embodiment, the voltage sensor 28 and the vehicle-side controller 26 constitute distance estimation means. Then, the vehicle-side controller 26 estimates the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 from the distances between the primary side resonance coils 13 a and 13 b and the secondary side resonance coil 21.

  The connection state of the switch SW1 is switched until the positional relationship between the power supply side facility 10 and the in-vehicle side facility 20 becomes a preset positional relationship, and the output voltage of the secondary coil 22 is detected by the voltage sensor 28. Further, the vehicle-side controller 26 calculates the distance between each primary-side resonance coil 13a, 13b and the secondary-side resonance coil 21. And the data of the positional relationship of the electric power feeding side equipment 10 and the vehicle-mounted side equipment 20 are used for the drive of the automatic parking apparatus 31, and the vehicle 30 is moved to a charge position.

  When the vehicle 30 is parked at the charging position, the vehicle controller 26 sends a power supply request signal to the power controller 14 and a signal notifying which of the two primary resonance coils 13a and 13b the secondary resonance coil 21 is closer to. Is sent. When receiving both signals, the power supply side controller 14 switches the switch SW1 to a position where the AC power supply 11 is connected to, for example, the secondary coil 22a. In this state, AC power that is about two orders of magnitude larger than that output from the AC power supply 11 when the vehicle 30 is moving is output at the resonance frequency, and the secondary battery 24 is charged.

According to this 2nd Embodiment, in addition to the effect similar to (5)-(8) of 1st Embodiment, the following effects can be acquired.
(9) The power supply side equipment 10 includes a plurality of primary coils 12a and 12b and a plurality of primary side resonance coils 13a and 13b, and the primary coils 12a and 12b are provided so as to be selectively connectable to the AC power source 11. The distance between each primary side resonance coil 13a, 13b and the secondary side resonance coil 21 in a state where an alternating voltage is applied to each primary coil 12a, 12b by distance estimation means (voltage sensor 28 and vehicle side controller 26). presume. The vehicle-side controller 26 estimates the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 from the distance between the two primary side resonance coils 13 a and 13 b and the secondary side resonance coil 21. Accordingly, the vehicle 30 can be easily moved to the charging position based on the estimated positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20, and the primary side resonance coils 13a and 13b provided on the power supply side. The secondary battery 24 mounted on the vehicle 30 can be efficiently charged without providing a moving means for moving the battery. Further, primary coils 12a and 12b used for non-contact power transmission to estimate the distance between the primary resonance coils 13a and 13b and the secondary resonance coil 21, and the primary resonance coils 13a and 13b and the secondary side. Since the resonance coil 21 and the secondary coil 22 are used, the number of newly provided components can be reduced.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. This embodiment is the same as the first embodiment in that one primary resonance coil and two secondary resonance coils are provided, but the secondary resonance is provided on the front side of the vehicle 30. The coil 21F is greatly different from the first embodiment in that one secondary resonance coil 21R is provided on the rear side. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the primary coil 12 is directly connected to the AC power source 11. The on-vehicle equipment 20 is provided with two secondary resonance coils 21F and 21R and two secondary coils 22F and 22R as first and second secondary resonance coils, and two secondary coils. 22F and 22R are configured to be selectively connectable to the charger 23 via the switch SW. Further, a voltage sensor 28 constituting a distance estimating means is provided so as to be selectively connectable to the two secondary coils 22F and 22R via the switch SW. As shown in FIGS. 7A and 7B, the secondary resonance coil 21 </ b> F is provided on the front side of the vehicle 30, and the secondary resonance coil 21 </ b> R is provided on the rear side of the vehicle 30.

  When the vehicle 30 moves to the charging position, as shown in FIG. 7A, the vehicle-side controller 26 uses the rear-side secondary resonance coil 21R to move the primary-side resonance coil. The distance between 13 and the secondary resonance coil 21R is calculated. Further, as shown in FIG. 7B, when moving forward, the distance between the primary resonance coil 13 and the secondary resonance coil 21F is calculated using the secondary resonance coil 21F on the front side. When the vehicle 30 moves to the charging position, the vehicle-side controller 26 outputs a signal to that effect to the power supply-side controller 14. When receiving the signal, the power supply side controller 14 controls the alternating current power supply 11 to output an alternating current that is about two orders of magnitude smaller than that output during power transmission for charging.

  Next, the operation when the vehicle 30 moves to the charging position and parks will be described with reference to FIG. When the driver operates the charge request switch when moving to the charging position, the vehicle controller 26 moves to the charging position to request the power source controller 14 to start charging, that is, to charge the secondary battery 24 in step S1. Send a signal to do so. When the power supply side controller 14 receives the signal, the power supply side controller 14 controls the AC power supply 11 to output an alternating current that is about two orders of magnitude smaller than that output during power transmission for charging. Next, the vehicle-side controller 26 determines whether or not the vehicle 30 is moving forward in step S2, and if it is moving forward, the flow advances to step S3 to start distance estimation using the front secondary resonance coil 21F (power receiving coil F). To do. More specifically, the vehicle-side controller 26 holds the switch SW in a state of being connected to the secondary resonance coil 21F, inputs the detection voltage from the voltage sensor 28, and determines the primary resonance coils 13 and 2 from the detection voltage. The distance from the secondary resonance coil 21F is calculated. Next, the vehicle-side controller 26 proceeds to step S4, whether or not the distance between the primary side resonance coil 13 and the secondary side resonance coil 21F is equal to or less than a predetermined distance, that is, the primary side resonance coil 13 and the secondary side resonance coil 21F. Is less than or equal to a preset distance at which the secondary battery 24 is efficiently charged. If it is below predetermined distance in step S4, the vehicle side controller 26 will progress to step S5, and if not below predetermined distance, it will return to step S3. In step S <b> 5, the vehicle-side controller 26 ends the distance estimation, and transmits a notification of the distance estimation end to the power source-side controller 14. And parking is completed by step S6 and the electric power feeding (electric power transmission) for charge of the secondary battery 24 is started.

  On the other hand, if the vehicle 30 is not moving forward in step S2, the vehicle-side controller 26 proceeds to step S7. In step S7, it is determined whether or not the vehicle 30 is moving backward. The distance estimation is started using the side resonance coil 21R (power receiving coil R). More specifically, the vehicle-side controller 26 holds the switch SW in a state of being connected to the secondary resonance coil 21R, inputs the detection voltage from the voltage sensor 28, and inputs the primary resonance coils 13 and 2 from the detection voltage. The distance from the secondary resonance coil 21R is calculated. Next, the vehicle-side controller 26 proceeds to step S9, whether or not the distance between the primary side resonance coil 13 and the secondary side resonance coil 21R is equal to or smaller than a predetermined distance, that is, the primary side resonance coil 13 and the secondary side resonance coil 21R. Is less than or equal to a preset distance at which the secondary battery 24 is efficiently charged. If it is less than the predetermined distance in step S9, the vehicle-side controller 26 proceeds to step S5, and if not less than the predetermined distance, returns to step S8. If it is not reverse in step S7, the process returns to step S2. In step S2 and step S7, neither forward nor reverse means that the vehicle 30 has not yet moved, and step S2 and step S7 are repeated until the vehicle 30 starts moving.

According to the third embodiment, in addition to the same effects as (7) and (8) of the first embodiment, the following effects can be obtained.
(10) One secondary resonance coil 21F is provided on the front side of the vehicle 30, and one secondary resonance coil 21R is provided on the rear side. When the vehicle 30 moves forward to the charging position, the front side The secondary side resonance coil 21F is used to estimate the distance, and when moving backward, the rear side secondary resonance coil 21R is used to estimate the distance. Therefore, compared with the configuration in which the secondary resonance coil is provided only on one of the front side and the rear side of the vehicle 30, regardless of whether the vehicle 30 moves forward or backward when moving to the charging position. The required moving distance can be shortened.

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the first embodiment and the second embodiment, a set of the secondary resonance coil and the secondary coil may be provided on the front side of the vehicle 30, or may be provided on both the front side and the rear side of the vehicle 30. . When the set of the secondary resonance coil and the secondary coil is provided on both the front side and the rear side of the vehicle 30, regardless of whether the vehicle 30 moves to the charging position, moves forward, or moves backward. Therefore, the required moving distance can be shortened.

  ○ As in the first embodiment, when a set of a plurality of secondary resonance coils 21a, 21b and secondary coils 22a, 22b is provided in the in-vehicle equipment 20, AC is exchanged with the secondary coils 22a, 22b when estimating the distance. Instead of the configuration in which the output voltage of the primary coil 12 is measured, an alternating current may be supplied to the primary coil 12 to measure the output voltage of the secondary coils 22a and 22b. In this case, the resistance R and the AC power supply 27 for distance measurement are not necessary, and the configuration is simplified.

  In the third embodiment, two sets of the secondary resonance coil 21F and the secondary coil 22F and two sets of the secondary resonance coil 21R and the secondary coil 22R on the front side and the rear side of the vehicle 30, respectively. Provide. The positions of the power supply side equipment 10 and the in-vehicle side equipment 20 are determined based on the distance between the primary side resonance coil 13 and the two secondary side resonance coils 21F or the primary side resonance coil 13 and the two secondary side resonance coils 21R. You may make it estimate. In this case, it is possible to move and park the vehicle 30 to the charging position more easily by using the data indicating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20 in the parking assistance device.

  ○ When estimating the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20, only one of them may be provided. However, three or more primary resonance coils and one secondary resonance coil may be provided, or three or more secondary resonance coils may be provided and one primary resonance coil may be provided. When starting the estimation of the distance between the primary side resonance coil and the secondary side resonance coil, if two sets that are large combinations of the detection voltages of the voltage sensors 15 and 28 are selected and the distance estimation is performed, the charging position Can be shortened.

  ○ Provided so that the axial centers of the primary coil 12 and the like and the primary resonance coil 13 and the like extend in a direction perpendicular to the ground surface, and the coils of the secondary resonance coil 21a and the secondary coil 22a. Instead of the configuration in which the shaft center is provided so as to extend in the vertical direction of the vehicle 30, the shaft centers of the coils such as the primary coil 12 and the primary resonance coil 13 are provided so as to extend in the horizontal direction with respect to the ground surface. You may make it the structure provided so that the axial center of coils, such as secondary side resonance coil 21a etc. and secondary coil 22a, may extend in the direction orthogonal to the up-down direction of the vehicle 30. For example, as shown in FIG. 8, the primary resonance coil 13 or the like is placed in the accommodation box of the power supply side equipment 10 provided so as to protrude above the ground so that the axis of the coil extends in the horizontal direction with respect to the ground surface. The secondary resonance coil 21 a and the like are provided on the front side of the vehicle 30 so that the axis of the coil extends in a direction perpendicular to the vertical direction of the vehicle 30. Further, the secondary resonance coil 21 a and the like may be provided on the rear side of the vehicle 30.

  When the secondary resonance coil 21a and the like are provided so as to extend in the horizontal direction so that the axis of the coil extends in a direction perpendicular to the vertical direction of the vehicle 30, the secondary resonance coil 21a and the like are arranged on the front side or the rear side of the vehicle 30. Instead of being provided on the side, the vehicle 30 may be provided on the side. That is, the primary resonance coil 13 and the like are provided such that the axis extends in the waterside direction with respect to the ground surface, and the secondary resonance coil 21a and the like are provided so that the axis extends in the vehicle width direction.

The vehicle 30 is not limited to a vehicle that requires a driver, and may be an automated guided vehicle.
○ When the charging position for the secondary battery 24 is indoors, the primary coil 12 and the primary resonance coil 13 of the power supply side equipment 10 and the like may be provided above the stop position of the vehicle 30 during charging, for example, on the ceiling Good.

  The distance estimation means is not limited to the voltage sensors 15 and 28 that detect the output voltage of the primary coil 12 or the secondary coil 22 or the like. For example, impedance measuring means for measuring the input impedance of the resonance system at the time of distance estimation may be provided as the distance estimation means. Here, the “resonance system input impedance” means a resonance system (primary coil, primary resonance coil, 2) measured at both ends of a primary coil or a secondary coil to which alternating current is supplied (input) during distance estimation. This indicates the impedance of the entire secondary resonance coil and secondary coil. In the first embodiment, the input impedance is measured at both ends of the secondary coils 22a and 22b, and in the second embodiment, the input impedance is measured at both ends of the primary coil 12. The impedance is measured, for example, by detecting the voltage at both ends of the primary coil 12 or the voltages at both ends of the secondary coils 22a and 22b. When the impedance is measured by detecting the voltages at both ends of the secondary coils 22a and 22b provided in the in-vehicle side equipment 20, the electric power is transmitted from the in-vehicle side equipment 20, and the detection of the voltage for measuring the impedance is also on the in-vehicle side. Performed at the facility 20. Therefore, the vehicle-side controller 26 does not need to communicate with the power-source-side controller 14 by radio communication, and the in-vehicle equipment 20 completes the estimation of the distance between the primary side resonance coil 13 and the secondary side resonance coils 21a and 21b. it can.

  ○ In order to estimate the positional relationship between the power supply side equipment 10 and the in-vehicle side equipment 20, it is sufficient that at least one of the primary side resonance coil and the secondary side resonance coil is provided. The coil is not essential. For example, when the load of the resonance type non-contact charging system is used with a constant load, the secondary coil can be eliminated and the power of the secondary resonance coil can be supplied to the charger 23.

○ When the secondary coil is eliminated, the distance estimating means uses the primary resonance coil and 2 based on at least one of the voltage value detected from the primary coil and the voltage value detected from the secondary resonance coil. What is necessary is just to estimate the distance between secondary side resonance coils. For example, even when power is transmitted from the in-vehicle side equipment 20, the distance between the primary side resonance coil and the secondary side resonance coil is estimated based on the voltage value detected from the primary coil, The power transmission efficiency may be obtained from the voltage value detected from the secondary resonance coil, and the distance between the primary resonance coil and the secondary resonance coil may be estimated from the power transmission efficiency. Further, even when power is transmitted from the power supply side equipment 10, the distance between the primary resonance coil and the secondary resonance coil is estimated based on the voltage value detected from the secondary resonance coil, or the primary You may obtain | require power transmission efficiency from the voltage value detected from a coil and a secondary side resonance coil, and may estimate the distance between a primary side resonance coil and a secondary side resonance coil from power transmission efficiency.

  ○ When transmitting power from the in-vehicle equipment 20, a bidirectional charger is used as the charger 23 without providing the distance measuring AC power supply 27 separately from the secondary battery 24 as in the first embodiment. Also good. That is, the charger 23 converts the AC power supplied from the secondary resonance coil into DC and charges the secondary battery 24, and converts the power supplied from the secondary battery 24 into AC and converts the secondary battery 24 to AC. The one with the function to supply to the side resonance coil is used. In this case, the AC power supply 27 for distance measurement becomes unnecessary.

  The power supply side equipment 10 has a primary coil 12 that is coupled to the primary side resonance coil 13 by electromagnetic induction and is selectively connected to the AC power source 11, and the in-vehicle side equipment 20 is a secondary side resonance coil. When the secondary coils 22a and 22b are coupled to the terminals 21a and 21b by electromagnetic induction and are selectively connected to the charger 23, the degree of freedom in selecting the distance estimation method is increased. The distance estimating means is configured to select the primary resonance coil 13 and the secondary resonance coil 21a, based on at least one of the voltage value detected from the primary coil 12 and the voltage value detected from the secondary coils 22a and 22b. What is necessary is just to estimate the distance between 21b. For example, when estimating the distance based on the voltage value detected from the primary coil 12, power is supplied from the in-vehicle equipment 20 as in the first embodiment, and the voltage of the primary coil 12 is detected to detect the distance. And a method of estimating the distance by supplying the power from the power supply side equipment 10 and obtaining the input impedance of the resonance system from the voltage of the primary coil 12. Even when the distance is estimated based on the voltage values detected from the secondary coils 22a and 22b, the distance is estimated by detecting the voltages of the secondary coils 22a and 22b and the voltages of the secondary coils 22a and 22b. There is a method of estimating the distance by obtaining the input impedance of the resonance system.

  The distance measuring AC power supply 27 is connected to the secondary coils 22a and 22b and the resistor R is connected to the primary coil 12, and the secondary resonance coils 21a and 21b are connected to the primary resonance coil 13. When power is transmitted and the distance is estimated, the distance estimation means is not limited to the configuration that estimates the distance during power transmission. For example, the distance estimating means transmits power from the first and second secondary resonance coils 21a and 21b to the primary resonance coil 13, and then disconnects from the AC power supply 27 for distance measurement. At least one of the voltage of the coil 12 and the voltages of the secondary coils 22a and 22b may be detected, and distance estimation may be performed based on the voltage value.

  The parking assist device is not limited to the automatic parking device 31 and may be any device that plays a role of reducing the driver's steering operation when the vehicle 30 is parked. For example, a device for displaying the target parking position and the current position of the vehicle 30 on the display, or a voice or display means whether to hold the steering position of the steering wheel at the current position, whether to steer right or left It is also possible to use a device that provides notification.

The charger 23 may be charged with the secondary battery 24 only by rectifying the alternating current output from the secondary coil 22 or the like by the rectifier circuit without providing the booster circuit.
○ The diameters of the primary coil 12 and the like and the secondary coil 22 and the like are not limited to the same configuration as the diameter of the primary side resonance coil 13 and the like and the secondary side resonance coil 21 and the like. Also good.

  The primary resonance coil 13 and the secondary resonance coil 21 and the like are not limited to the shape in which the electric wire is wound spirally, and may have a spiral shape on one plane. In this case, the axial length of the resonance coil is reduced, and the depth of the hole formed on the ground can be reduced.

  ○ The outer shape of the primary coil 12, etc., the primary side resonance coil 13, etc., the secondary side resonance coil 21, etc., and the secondary coil 22 etc. is not limited to a circle, for example, a polygon such as a quadrangle, a hexagon, or a triangle. Or may be oval.

  The capacitor C connected to the primary side resonance coil 13 or the like and the secondary side resonance coil 21 or the like may be omitted. However, the configuration in which the capacitor C is connected can lower the resonance frequency compared to the case where the capacitor C is omitted. Further, if the resonance frequency is the same, the primary side resonance coil 13 and the like and the secondary side resonance coil 21 and the like can be downsized compared to the case where the capacitor C is omitted.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention described in claim 6, a voltage sensor that detects a voltage across the resistor in a state where the resistor is connected to the primary coil constitutes the distance estimating means.

  (2) In the invention according to any one of claims 3 to 7 and the technical idea (1), the secondary resonance coil and the secondary coil are respectively arranged on a front side and a rear side of a vehicle. The secondary resonance coil provided on the front side is used for distance estimation when the vehicle moves forward to the charging position, and the secondary provided on the rear side when the vehicle moves backward to the charging position. A side resonance coil is used for distance estimation.

  (3) In the first aspect of the invention, a plurality of primary side resonance coils and a plurality of secondary side resonance coils are provided, and a plurality of sets of primary side resonance coils are provided when the required power supply is equal to or greater than a preset value. Electric power is transmitted simultaneously using the coil and the secondary resonance coil.

  (4) In the invention according to any one of claims 2 to 7 and the technical ideas (1) to (3), the secondary resonance coil is provided at a bottom of a vehicle, and the primary The coil and the primary resonance coil are provided so as to be positioned below the vehicle parked at the charging position.

(5) AC power source, power supply side equipment including a primary side resonance coil that receives power supply from the AC power source, a secondary side resonance coil that receives power from the primary side resonance coil by magnetic field resonance, A resonance-type non-contact charging system including a charger that receives power supplied from the secondary-side resonance coil and a vehicle-mounted facility that includes a secondary battery connected to the charger,
A plurality of at least one of the primary side resonance coil and the secondary side resonance coil are provided, and distance estimation means for estimating a distance between the primary side resonance coil and the secondary side resonance coil is provided. Resonance type non-contact charging system.

  R: Resistance, 10: Power supply side equipment, 11: AC power supply, 12, 12a, 12b ... Primary coil, 13, 13a, 13b ... Primary resonance coil, 20: On-vehicle equipment, 21, 21a, 21b, 21F , 21R ... secondary resonance coil, 15, 28 ... voltage sensor constituting distance estimation means, 22, 22a, 22b, 22F, 22R ... secondary coil, 23 ... charger, 24 ... secondary battery, 26 ... distance A vehicle-side controller that constitutes an estimation unit and serves as a position estimation unit, 27... AC power supply for distance measurement, 30... Vehicle, 31.

Claims (7)

  1. AC power source, power supply side equipment including a primary side resonance coil that receives power supply from the AC power source, a secondary side resonance coil that receives power from the primary side resonance coil by magnetic field resonance, and the secondary side A resonance-type non-contact charging system comprising a charger that receives power supplied from a side resonance coil and an in-vehicle facility that includes a secondary battery connected to the charger,
    A plurality of at least one of the primary side resonance coil and the secondary side resonance coil are provided;
    Distance estimating means for estimating a distance between the primary side resonance coil and the secondary side resonance coil;
    Position estimation means for estimating a positional relationship between the power supply side equipment and the in-vehicle side equipment from the distance estimated by the distance estimation means;
    A resonance-type non-contact charging system comprising:
  2. The power supply side facility has a primary coil that is coupled to the primary resonance coil by electromagnetic induction and is selectively connected to the AC power source,
    The distance estimating means includes the primary resonance coil and the secondary resonance coil based on at least one of a voltage value detected from the primary coil and a voltage value detected from the secondary resonance coil. The resonance type non-contact charging system according to claim 1, wherein a distance between the two is estimated.
  3. The power supply side facility has a primary coil that is coupled to the primary resonance coil by electromagnetic induction and is selectively connected to the AC power source,
    The on-vehicle side equipment has a secondary coil that is coupled to the secondary resonance coil by electromagnetic induction and is selectively connected to the charger.
    The distance estimating means is configured to connect between the primary resonance coil and the secondary resonance coil based on at least one of a voltage value detected from the primary coil and a voltage value detected from the secondary coil. The resonance type non-contact charging system according to claim 1, wherein the distance is estimated.
  4. The in-vehicle equipment has a first secondary resonance coil and a second secondary resonance coil,
    The position estimation means includes a distance between the first secondary resonance coil and the primary resonance coil estimated by the distance estimation means, and the second secondary resonance coil and the primary resonance coil. The resonance-type non-contact charging system according to any one of claims 1 to 3, wherein a positional relationship between the power supply side equipment and the in-vehicle side equipment is estimated from a distance from the vehicle.
  5. The power supply side facility includes a first primary resonance coil and a second primary resonance coil,
    The position estimation means includes a distance between the first primary resonance coil and the secondary resonance coil estimated by the distance estimation means, and the second primary resonance coil and the secondary resonance coil. The resonance-type non-contact charging system according to any one of claims 1 to 3, wherein a positional relationship between the power supply side equipment and the in-vehicle side equipment is estimated from a distance from the vehicle.
  6. A resistor selectively connected to the primary coil;
    A distance measuring AC power source selectively connected to the secondary coil;
    The distance measuring AC power supply is connected to each secondary coil and the resistor is connected to the primary coil, and power is transmitted from each secondary resonance coil to the primary resonance coil.
    The distance estimating means transmits a power value from the secondary resonance coil to the primary resonance coil and detects a voltage value detected from the secondary coil and from the secondary resonance coil to the primary resonance coil. 6. The distance between the secondary resonance coil and the primary resonance coil is estimated based on at least one of voltage values detected from the primary coil after transmitting electric power. The resonance-type non-contact charging system according to any one of claims.
  7.   The vehicle on which the on-vehicle side equipment is mounted includes a parking assistance device, and data indicating a positional relationship between the power feeding side equipment and the on-vehicle side equipment estimated by the position estimation unit is used in the parking assistance device. The resonant non-contact charging system according to any one of claims 1 to 6.
JP2009027673A 2009-02-09 2009-02-09 Resonance type non-contact charging system Pending JP2010183813A (en)

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