JP5509883B2 - Wireless charging device for vehicle - Google Patents

Wireless charging device for vehicle Download PDF

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Publication number
JP5509883B2
JP5509883B2 JP2010018381A JP2010018381A JP5509883B2 JP 5509883 B2 JP5509883 B2 JP 5509883B2 JP 2010018381 A JP2010018381 A JP 2010018381A JP 2010018381 A JP2010018381 A JP 2010018381A JP 5509883 B2 JP5509883 B2 JP 5509883B2
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charging
coil
vehicle
magnetic field
primary coil
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JP2011160515A (en
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統 米地
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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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
    • 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
    • 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
    • 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
    • Y02T90/125Alignment 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
    • Y02T90/14Plug-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

Description

  The present invention relates to a vehicle wireless charging apparatus in which a secondary coil provided in a vehicle receives power wirelessly from a primary coil provided in a parking lot and charges the power to a battery of the vehicle. .

  In recent years, electric vehicles equipped with large-capacity batteries such as electric vehicles and hybrid vehicles are becoming popular. There is also known a vehicle wireless charging device that wirelessly charges an electric vehicle battery from the outside of the electric vehicle. For example, Patent Document 1 discloses a wireless charging device for a vehicle that performs power transmission by a resonance method. In power transmission by the resonance method, the secondary coil provided in the vehicle is magnetically coupled to the primary coil provided in the parking lot by magnetic field resonance, so that power is transmitted from the primary coil wirelessly. Receive power. Details of power transmission by the resonance method are shown in Non-Patent Document 1. By employing power transmission by the resonance method, it is possible to transmit several kilowatts of power to several meters ahead.

  Generally, in the vehicle wireless charging apparatus, the charging efficiency is further deteriorated as the positional relationship between the primary side coil and the secondary side coil greatly deviates from the ideal positional relationship. Here, in the power transmission by the resonance method, the degree to which the power transmission efficiency is deteriorated according to the magnitude of the positional deviation between the primary side coil and the secondary side coil is relatively small compared to other methods. However, even in the power transmission by the resonance method, it is more preferable that the positional deviation between the primary coil and the secondary coil is small.

  Therefore, in the parking lot provided with the vehicle wireless charging device, guiding the electric vehicle to the target position is important for shortening the charging time and saving power. In order to guide the electric vehicle to the target position, the relative position between the primary coil of the parking lot and the secondary coil of the vehicle is detected, and information on the relative position is notified to the driver. It is valid.

  On the other hand, Patent Document 2 shows a technique for detecting the position of a vehicle based on the position of the magnetic marker using a plurality of magnetic markers provided on the road surface and a plurality of magnetic sensors provided on the vehicle. Has been. In the technique disclosed in Patent Document 2, the strength of each magnetic field generated by a plurality of magnetic markers arranged on the road surface is detected by a plurality of magnetic sensors arranged on the vehicle. Then, the position of the vehicle is detected by comparing the distribution of the detected magnetic field strength with a map of the magnetic field strength prepared in advance.

JP 2009-106136 A JP-A-9-292236

Andre Kurs et al., "Wireless Power Transfer via Strongly Coupled Magnetic Resonances", Science Vol. 317. no. 5834, pp.83-86, July 6, 2007, URL: http://www.sciencemag.org/cgi /reprint/317/5834/83.pdf

  However, the vehicle position detection device disclosed in Patent Document 2 requires a large number of magnetic markers arranged on the ground of the parking lot and a large number of magnetic sensors arranged on the vehicle for correct position detection. . Therefore, when the technique of Patent Document 2 is adopted for the vehicle wireless charging device, there is a problem that the number of parts increases and the configuration of the device becomes complicated.

  An object of the present invention is to enable detection of a relative position between a primary coil of a parking lot and a secondary coil of a vehicle in a vehicular wireless charging device with a simple configuration.

  A wireless charging device for a vehicle according to a first aspect of the present invention includes a primary coil for charging, a secondary coil for charging, a charging unit, a secondary coil for sensor, a first power detection unit, and a second power. A detection unit, a position calculation unit, and an information output unit are provided. The primary coil for charging is a coil that is provided in a parking lot and emits a magnetic field in which the magnetic force varies. The secondary coil for charging is a coil that is provided in the vehicle and receives power from the primary coil for charging wirelessly. The charging unit is provided in the vehicle and charges a rechargeable battery with electric power obtained by the secondary coil for charging. The sensor secondary coil is a coil that is provided at a position different from the charging secondary coil in the vehicle, and receives power wirelessly from a coil that generates a magnetic field whose magnetic force fluctuates in the parking lot. The first power detection unit detects the intensity of power obtained by the secondary coil for charging. The second power detection unit detects the intensity of power obtained by the sensor secondary coil. The position calculation unit calculates a relative position between the primary coil for charging and the secondary coil for charging using detection results of the first power detection unit and the second power detection unit. . The information output unit outputs information on the relative position calculated by the position calculation unit.

The first wireless charging device for a vehicle according to the invention, further Ru and a primary coil and a magnetic field output switching unit sensor. The primary coil for sensor is a coil that is provided at a position different from the primary coil for charging in the parking lot and emits a magnetic field whose magnetic force varies. The magnetic field output switching unit switches between magnetic field output by the charging primary coil and magnetic field output by the sensor primary coil. In this case, the position calculation unit uses the detection result of each of the first power detection unit and the second power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit, and The relative position between the secondary coil for charging is calculated.

  For example, the primary coil for sensor is arranged upstream of the primary coil for charging in the approach direction of the vehicle to the parking lot. The secondary coil for sensor faces the primary coil for sensor when the vehicle is parked at a target position where the secondary coil for charging and the primary coil for charging face each other. It is arranged at the position to do. And the said position calculation part WHEREIN: The detection result of the said 1st electric power detection part when the magnetic field is output from the said primary coil for charge, and the said magnetic field when the magnetic field is output from the said sensor primary side coil The relative position is calculated using detection results of the first power detection unit and the second power detection unit.

  The wireless charging device for a vehicle according to a second aspect of the invention includes the primary coil for charging, the secondary coil for charging, the charging unit, the primary coil for sensor, and the magnetic field output switching unit. And the position calculation unit and the information output unit. In the second invention, the position calculation unit uses the detection result of the first power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit, and uses the primary coil for charging and the secondary side for charging. The relative position with the coil is calculated.

Further, the vehicular wireless charging apparatus according to the second aspect of the present invention further includes the sensor secondary coil and the second power detection unit, similarly to the vehicular wireless charging apparatus according to the first aspect of the present invention. The In this case, the position calculation unit uses the detection result of each of the first power detection unit and the second power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit, and The relative position between the secondary coil for charging is calculated.

  Further, it is conceivable that the vehicle wireless charging device according to the first invention or the vehicle wireless charging device according to the second invention further includes an operation mode switching unit. The operation mode switching unit sets the operation mode of the wireless charging device for the vehicle using the detection result of the power detection unit when the charging unit does not charge the rechargeable battery. Switching between a position detection mode for calculating the relative position and a charging mode for charging the rechargeable battery by the charging unit.

  In the first invention and the second invention, it is conceivable that the charging secondary coil includes a secondary self-resonant coil and a secondary electromagnetic induction coil. The secondary self-resonant coil is a coil that receives power from the charging primary coil by being magnetically coupled to the charging primary coil by magnetic field resonance. The secondary side electromagnetic induction coil is a coil that receives electric power from the secondary self-resonant coil by electromagnetic induction. Further, it is conceivable that the information output unit outputs an image of the relative position information calculated by the position calculation unit to a display unit provided in the vehicle.

  According to the first and second aspects of the invention, the primary charging coil for the parking lot and the secondary charging coil for the vehicle, which are originally provided in the vehicle wireless charging device, are the primary coil for charging and the primary coil for charging. It is also used for detecting the relative position between the secondary coil for charging. In addition, by adopting the magnetic field output switching unit, the power supply unit including an inverter circuit or the like can be used for power supply to the primary coil for charging and power supply to the primary coil for sensor. It becomes possible to share. As a result, in the vehicle wireless charging apparatus, detection of the relative position between the primary side charging coil and the secondary side charging coil can be realized with a simple configuration.

1 is a schematic configuration diagram of a vehicle wireless charging device 1 according to a first embodiment of the present invention. It is a schematic diagram showing the position detection method of the two coils for charging in the vehicle wireless charging device. It is a figure which illustrates the screen of the information output for the vehicle guidance in the wireless charging device for vehicles 1. It is a schematic block diagram of the wireless charging device 2 for vehicles which concerns on 2nd Embodiment of this invention. It is a schematic diagram showing the position detection method of the two coils for charging in the wireless charging device 2 for vehicles. It is a figure which illustrates the screen of the information output for the vehicle guidance in the wireless charging device 2 for vehicles. It is a schematic block diagram of the vehicle wireless charging device 3 which concerns on 3rd Embodiment of this invention. It is a schematic diagram showing the position detection method of the two coils for charging in the vehicle wireless charging device 3. It is a figure which illustrates the screen of the information output for vehicle guidance in wireless charging device for vehicles 3. It is a figure showing an example of arrangement | positioning of the coil in the wireless charging device 3 for vehicles. It is a schematic diagram showing the relationship between the electric current of a secondary side coil, and the distance from a primary side coil to a secondary side coil.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention. The wireless charging apparatuses for vehicles 1 to 3 according to the first to third embodiments of the present invention receive power wirelessly from a primary coil provided in a parking lot by a secondary coil provided in the vehicle. Then, the electric power is charged to the battery of the vehicle. In the vehicular wireless charging apparatuses 1 to 3, the secondary side coil provided in the vehicle is magnetically coupled to the primary side coil provided in the parking lot by magnetic field resonance. Power is received wirelessly from the side coil. Hereinafter, the vehicle wireless charging device 1 according to the first embodiment, the vehicle wireless charging device 2 according to the second embodiment, and the vehicle wireless charging device 3 according to the third embodiment are respectively the charging device 1 and the charging device 2. And charging device 3 for short.

<First Embodiment>
First, the structure of the charging device 1 which concerns on 1st Embodiment of this invention is demonstrated, referring FIG. As shown in FIG. 1, the charging device 1 includes a parking lot 9 into which a vehicle 8 enters, a power transmission side device 10 a installed near the parking lot 9, and a power reception side device 20 a provided in the vehicle 8. . In FIG. 1, an approximate approach direction 91 of the vehicle 8 to the parking lot 9 is indicated by an arrow. The entry direction 91 shown in FIG. 1 is a direction along a straight line from one short side of the rectangular parking lot 9 to the other short side, but one of the long sides of the rectangular parking lot 9 It is also conceivable that the direction is along a curve from the portion near the short side to the other short side.

  The power transmission side device 10 a includes a primary coil 11 for charging, a high frequency power generation unit 13, and a power supply control unit 14. The power receiving side device 20a includes a charging secondary coil 21, a sensor secondary coil 22, a charging circuit 23, a battery 24, an arithmetic circuit 25, a first ammeter 26, a second An ammeter 27. In addition to the power receiving device 20a, the vehicle 8 is provided with a display panel 31 and a speaker 32 as information output devices. The vehicle 8 also includes other components such as a motor as a power source and a drive circuit for the motor, but these components are omitted in FIG.

  The high-frequency power generation unit 13 is a device that converts power supplied from an AC power supply 15 such as a commercial power supply into high-frequency power and supplies the high-frequency power to the primary coil 11 for charging. The high-frequency power generation unit 13 is installed at or near the parking lot 9. For example, the high frequency power generation unit 13 generates AC power having a frequency of about 1 to 100 MHz.

  The primary coil 11 for charging is a coil that is provided in the parking lot 9 and emits a magnetic field whose magnetic force fluctuates at a high frequency when high-frequency power is supplied. For example, the primary coil 11 for charging is embedded in the ground of the parking lot 9.

  The power supply control unit 14 is a device that performs control to switch between operation and stop of the high-frequency power generation unit 13. The feeding control unit 14 controls the start and stop of magnetic field output by the primary coil 11 for charging.

  On the other hand, the charging secondary coil 21 is a coil that is mounted on the vehicle 8 and receives power from the charging primary coil 11 by radio. FIG. 1 shows a state in which the vehicle 8 is stopped at a predetermined target position in the parking lot 9. In a state where the vehicle 8 is stopped at the target position in the parking lot 9, the charging secondary coil 21 is positioned to face the charging primary coil 11. For example, in a state where the vehicle 8 is stopped at the target position, the charging secondary coil 21 and the charging primary coil 11 are coaxially positioned. This state is a state in which the efficiency of power transmission from the charging primary coil 11 to the charging secondary coil 21 is highest.

  The charging circuit 23 converts high-frequency power obtained by the secondary coil for charging 21 into direct-current power that meets the specifications of the battery 24, and supplies the direct-current power to the battery 24. This is a device for charging the battery 24. For example, the charging circuit 23 converts a high-frequency AC voltage obtained by the rectifier circuit that rectifies the high-frequency power or the secondary coil 21 for charging into a DC voltage that meets the specifications of the battery 24. AC / DC converter circuit.

  The battery 24 is a rechargeable secondary battery such as a lithium ion battery or a nickel metal hydride battery. The electric power stored in the battery 24 is supplied to a wheel driving motor of the vehicle 8 and other electrical components.

  The sensor secondary coil 22 is a coil that wirelessly receives power from a coil that generates a magnetic field whose magnetic force fluctuates at a high frequency in the parking lot 9. In the present embodiment, the sensor secondary coil 22 receives electric power from the charging primary coil 11. The sensor secondary coil 22 is provided at a position different from the charging secondary coil 21 in the vehicle 8.

  The charging secondary coil 21 is coaxially opposed to the charging primary coil 11 when the vehicle 8 is parked at a predetermined target position in the parking lot 9. In the example shown in FIG. 1, the charging secondary coil 21 is fixed near the center of the bottom surface of the vehicle 8 in the vehicle width direction. The sensor secondary side coil 22 is biased to one side in the vehicle width direction on the bottom surface of the vehicle 8, that is, closer to the left side or the right side than the position of the charging secondary side coil 21. It is fixed. The arrangement of the coils shown in FIG. 1 is an example, and the charging secondary coil 21 and the sensor secondary coil 22 are positioned symmetrically with respect to the center line of the vehicle 8 in the vehicle width direction. It is also conceivable that other arrangements may be employed, such as when arranged in

  In the present embodiment, the wireless power transmission from the charging primary coil 11 to each of the charging secondary coil 21 and the sensor secondary coil 22 is power transmission by a resonance method. Therefore, the charging primary coil 11, the charging secondary coil 21, and the sensor secondary coil 22 each include a self-resonant coil and an electromagnetic induction coil.

  That is, the charging primary coil 11 includes a charging primary electromagnetic induction coil 112 connected to the high-frequency power generation unit 13 and charging for receiving power from the primary electromagnetic induction coil 112 by electromagnetic induction. A primary-side self-resonant coil 111.

  The secondary coil for charging 21 includes a secondary self-resonant coil for charging 211 and a secondary electromagnetic induction coil 212 for charging. The secondary self-resonant coil 211 for charging is a coil that receives power from the primary self-resonant coil 111 by being magnetically coupled to the primary self-resonant coil 111 for charging by magnetic field resonance. It is. The secondary electromagnetic induction coil 212 for charging is a coil that receives electric power from the secondary self-resonant coil 211 for charging by electromagnetic induction. The electric power obtained by the secondary electromagnetic induction coil 212 is supplied to the charging circuit 23 by wired transmission.

  Similarly, the sensor secondary coil 22 includes a sensor secondary self-resonant coil 221 and a sensor secondary electromagnetic induction coil 222. The secondary self-resonant coil 221 for sensor is a coil that receives power from the primary self-resonant coil 111 by being magnetically coupled to the primary self-resonant coil 111 for charging by magnetic field resonance. It is. The secondary electromagnetic induction coil 222 for sensors is a coil that receives electric power from the secondary self-resonant coil 221 for sensors by electromagnetic induction.

  When power transmission by the resonance method is employed, the power transmission efficiency is determined according to the amount of positional deviation between the charging primary coil 11, the charging secondary coil 21, and the sensor secondary coil 22. Is worse than when other methods are employed.

  A technology capable of transmitting a relatively large amount of power up to several hundred millimeters ahead by power transmission using electromagnetic induction is being put into practical use. By using such a technique, it is also conceivable that power transmission by electromagnetic induction is adopted as a method of power transmission from the charging primary coil 11 to the charging secondary coil 21.

  The first ammeter 26 detects a current flowing through the charging secondary coil 21 as an index representing the intensity of the electric power obtained by the charging secondary coil 21. The first ammeter 26 is an example of the first power detector. Further, the second ammeter 27 detects a current flowing through the sensor secondary coil 22 as an index representing the intensity of the electric power obtained by the sensor secondary coil 22. The second ammeter 27 is an example of the second power detection unit.

  The arithmetic circuit 25 is a circuit that performs various types of information processing and device control based on detection results of various sensors provided in the vehicle 8, and executes a program stored in a memory such as a ROM (Read Only Memory). Thus, a processor such as an MPU (Micro Processor Unit) or a DSP (Digital Signal Processor) that performs various operations is provided.

  More specifically, the arithmetic circuit 25 inputs detection results of the first ammeter 26 and the second ammeter 27, and uses the detection results to detect the charging primary coil 11 and the charging. A position calculation process for calculating a relative position with the secondary coil 22 is executed. Further, the arithmetic circuit 25 executes a guidance information output process for outputting information on the relative position calculated by the position calculation process through the display panel 31 and the speaker 32 as vehicle guidance information.

  The arithmetic circuit 25 has a function of switching whether or not the battery 24 is charged by the charging circuit 23 by controlling the charging circuit 23. The arithmetic circuit 25 sets the operation mode of the vehicular wireless charging device 1 in the state where the charging circuit 23 does not charge the battery 24 and the first ammeter 26 and the second current. Switching between a position detection mode in which the position calculation process and the guidance information output process are executed using a total of detected currents 27 and a charging mode in which the battery 24 is charged by the charging circuit 23 is performed.

  For example, the arithmetic circuit 25 shifts the operation mode to the position detection mode when detecting an operation on an operation unit such as a vehicle guidance start button provided in the cabin of the vehicle 8. The arithmetic circuit 25 shifts the operation mode to the charge mode when detecting an operation on an operation unit such as a charge start button provided in the cabin of the vehicle 8.

  On the other hand, there may be a case where the vehicle 8 is provided with an entry detection sensor that detects that the vehicle 8 has started entering the parking lot 9. In this case, it is conceivable that the arithmetic circuit 25 automatically shifts the operation mode to the position detection mode in accordance with the detection result of the entry detection sensor. The approach detection sensor is, for example, a wireless signal receiving device that detects a wireless signal output from a wireless signal output unit provided in the parking lot 9. The wireless signal is, for example, an infrared signal or a radio signal.

  In addition, a signal transmission unit that wirelessly transmits the entry detection sensor and a detection signal of the entry detection sensor to the vehicle 8 is provided in the parking lot 9, and a signal reception unit that receives the wireless signal transmitted from the signal transmission unit A case in which the vehicle 8 is provided is also conceivable. In this case, it is conceivable that the arithmetic circuit 25 automatically shifts the operation mode to the position detection mode in accordance with the detection result of the entry detection sensor received by the signal receiving unit.

  The arithmetic circuit 25 automatically performs an operation mode transition from the position detection mode to the charge mode based on the relative position calculated in the position detection mode, as exemplified below. Is also possible. For example, the arithmetic circuit 25 determines that the charging secondary coil 21 is within a predetermined allowable range with respect to the charging primary coil 11 based on the relative value calculated by the position detection process. Determine if it exists. The arithmetic circuit 25 determines that the charging secondary coil 21 is within the allowable range, and shifts the operation mode to the charging mode when the wheel driving motor is stopped. Let

  As described above, an embodiment in which the arithmetic circuit 25 automatically shifts the operation mode based on detection results of various sensors is also conceivable. The arithmetic circuit 25 is an example of the position calculation unit, the information output unit, and the operation mode switching unit.

  Next, a specific example of the position calculation processing by the arithmetic circuit 25 will be described with reference to FIGS. 11 and 2. FIG. 11 is a schematic diagram illustrating the relationship between the current generated in the secondary coil due to the magnetic field resonance with the primary coil and the distance from the primary coil to the secondary coil. In the first embodiment, the charging primary coil 11 corresponds to the primary coil, and the charging secondary coil 21 and the sensor secondary coil 22 are used as the secondary coil. Equivalent to.

  As shown in FIG. 11, the current generated in the secondary coil has a certain characteristic that the level decreases as the secondary coil moves away from the target state that is closest to the primary coil. doing. Therefore, in the nonvolatile memory included in the arithmetic circuit 25, distance conversion information representing the relationship between the current generated in the secondary coil and the distance from the primary coil to the secondary coil is expressed by mathematical formula data. Alternatively, it is stored in advance as reference data such as a lookup table. The distance between the coils in the distance conversion information is the distance from the primary coil to the secondary coil in the plane in which the vehicle 8 moves.

  FIG. 2 shows an example of a positional relationship between the charging primary coil 11, the charging secondary coil 21, and the sensor secondary coil 22 in the middle of the vehicle 8 toward the target position in the parking lot 9. It is the figure represented typically. FIG. 2 is a schematic view when each coil is viewed from above.

  The arithmetic circuit 25 in the charging device 1 applies each of the current values detected by the first ammeter 26 and the second ammeter 27 to the distance conversion information, whereby the secondary coil 21 for charging is used. A distance L11 with the center position 21p as a base point and a distance L12 with the center position 22p of the sensor secondary coil 22 as a base point are calculated. The distance L11 is a distance from the center position 21p to the center position 31p of the charging primary coil 11. Similarly, the distance L12 is a distance from the center position 22p to the center position 31p of the charging primary coil 11. Further, the positions of the two center positions 21p and 22p in the vehicle 8 are known.

  In the two-dimensional coordinate system based on the vehicle 8, the arithmetic circuit 25 includes an arc 21a having a radius L11 centered on the center position 21p and an arc 22a having a radius L12 centered on the center position 22p. The coordinates of the intersection 31p are calculated. Here, it can be said that the two-dimensional coordinate system based on the vehicle 8 is a coordinate system based on the positions of the charging secondary coil 21 and the sensor secondary coil 22 in the vehicle 8.

  Further, the arithmetic circuit 25 calculates, as the relative position, a deviation between the coordinates of the center position 21p and the coordinates of the intersection 31p in a two-dimensional coordinate system with the vehicle 8 as a reference. The two-dimensional coordinate system based on the vehicle 8 is, for example, a coordinate system in which the center position 21p is the origin, one of the vehicle width direction and the front-rear direction of the vehicle 8 is the X axis, and the other is the Y axis. Can be considered.

  In theory, there may be two intersections between the two arcs 21a and 22a. However, the primary coil 11 for charging exists on the traveling direction side of the vehicle 8 entering the parking lot 9 with respect to the position of the secondary coil 21 for charging. For example, in the example shown in FIG. 1, the charging primary coil 11 exists on the rear side of the vehicle 8 with respect to the position of the charging secondary coil 21. Therefore, the arithmetic circuit 25 limits the range of the arc 21a and the arc 22a to the traveling direction side of the vehicle 8 entering the parking lot 9 used for calculating the intersection with respect to the position of the secondary coil 21 for charging. To do. Thereby, the position of the one primary coil 11 for charge is specified.

  FIG. 3 is an example of an information output screen for vehicle guidance in the charging apparatus 1. In the guidance information output process, the arithmetic circuit 25 outputs information on the relative position calculated by the position calculation process to the display panel 31 as vehicle guidance information. In the vehicle guidance information illustrated in FIG. 3, an image 8 g of the vehicle 8, an image 21 g of the charging secondary coil 21, and an image 11 g of the charging primary coil 11 are calculated by the position calculation process. The image information is arranged so as to correspond to the relative position. In the image information, each image is arranged in a coordinate system based on the charging secondary coil 21 and the sensor secondary coil 22 in the vehicle 8.

  Further, as shown in FIG. 3, the arithmetic circuit 25 moves the secondary coil for charging 21 to the target position facing the primary coil for charging 11 based on the image information as the guidance information. Information for notifying the moving direction and the moving amount of the vehicle 8 can also be included. The information on the moving direction and the moving amount in this case is information based on a coordinate system based on the secondary coil for charging 21 and the secondary coil for sensor 22 in the vehicle 8.

  The arithmetic circuit 25 determines the moving direction and amount of movement of the vehicle 8 for moving the charging secondary coil 21 to the target position facing the charging primary coil 11 in the guidance information output process. The voice information to be notified is output to the speaker 32 as the vehicle guidance information.

  By referring to the guidance information presented by the guidance information output process, the driver of the vehicle 8 can easily operate the steering wheel so that the vehicle 8 smoothly moves toward the target position. Moreover, there is no need for the positioning wheel stopper that contacts the wheels of the vehicle 8 to protrude from the parking lot 9.

  Furthermore, in the charging device 1, the primary charging coil 11, the secondary charging coil 22, and the high-frequency power generation unit 13 that are originally provided in the vehicle wireless charging device are used to detect the relative position. Is also used. As a result, the vehicular wireless charging apparatus 1 can realize the detection of the relative position with a simple configuration.

Second Embodiment
Next, the configuration of the charging device 2 according to the second embodiment of the present invention will be described with reference to FIG. The charging device 2 is different from the charging device 1 shown in FIG. 4, the same components as those shown in FIG. 1 are given the same reference numerals. Hereinafter, only different points of the charging device 2 from the charging device 1 will be described.

  The charging device 2 includes a power receiving side device 20 b in which the sensor secondary coil 22 and the second ammeter 27 are removed from the power receiving side device 20 a in the charging device 1. Furthermore, the charging device 2 includes a power transmission side device 10b in which a sensor primary side coil 12 and a magnetic field output switching unit 16 are added to the power transmission side device 10a in the charging device 1. These points are different from the charging device 1 in the charging device 2. The sensor primary coil 12 has the same configuration as the charging primary coil 11.

  The primary coil for sensor 12 is a coil that is arranged at a position different from the primary coil for charging 11 in the parking lot 9 and generates a magnetic field whose magnetic force varies at a high frequency. The magnetic field output switching unit 16 switches between magnetic field output by the charging primary coil 11 and magnetic field output by the sensor primary coil 12.

  More specifically, the magnetic field output switching unit 16 supplies the high-frequency power output from the high-frequency power generation unit 13 to either the charging primary coil 11 or the sensor primary coil 12. Switch between. In other words, the high-frequency power generation unit 13 is commonly used for power supply to the charging primary coil 11 and power supply to the sensor primary coil 12. For example, the magnetic field output switching unit 16 switches the power supply destination according to the control signal from the power supply control unit 14.

  Then, the arithmetic circuit 25 in the charging device 2 uses the detection result of the first ammeter 26 corresponding to the magnetic field switched by the magnetic field output switching unit 16 and the charging primary coil 11 and the charging. The position calculation process for calculating the relative position with the secondary coil 21 is performed.

  Next, a specific example of the position calculation process by the arithmetic circuit 25 in the charging device 2 will be described with reference to FIG. FIG. 5 schematically shows an example of the positional relationship of the charging primary coil 11, the sensor primary coil 12, and the charging secondary coil 21 in the middle of the vehicle 8 toward the target position in the parking lot 9. FIG. FIG. 5 is a schematic diagram when each coil is viewed from above.

  The arithmetic circuit 25 in the charging device 2 includes the first ammeter 26 when the magnetic field of the charging primary coil 11 is output and when the magnetic field of the sensor primary coil 12 is output. The detected current value is applied to the distance conversion information described with reference to FIG. As a result, the arithmetic circuit 25 calculates a distance L21 based on the center position 11p of the charging primary coil 11 and a distance L22 based on the center position 12p of the sensor primary coil 12. The distance L21 is a distance from the center position 11p to the center position 32p of the charging secondary coil 21. Similarly, the distance L22 is a distance from the center position 12p to the center position 32p of the charging secondary coil 21. Further, the relative positions of the two center positions 11p and 12p in the parking lot 9 are known.

  In the two-dimensional coordinate system with the parking lot 9 as a reference, the arithmetic circuit 25 has an arc 11a having a radius L21 centered on the center position 11p and an arc 12a having a radius L22 centered on the center position 12p. The coordinates of the intersection 32p with are calculated. Here, it can be said that the two-dimensional coordinate system based on the parking lot 9 is a two-dimensional coordinate system based on the positions of the two primary coils 11 and 12 in the parking lot 9.

  Furthermore, the arithmetic circuit 25 calculates a deviation between the coordinates of the center position 11p and the coordinates of the intersection point 32p as the relative position in a two-dimensional coordinate system with the parking lot 9 as a reference. The two-dimensional coordinate system with reference to the parking lot 9 has, for example, one of a direction parallel to the approach direction 91 of the vehicle 8 to the parking lot 9 and a direction perpendicular to the direction, the origin being the center position 11p. It is conceivable that the coordinate system has the X axis and the other as the Y axis.

  By the way, the position of the vehicle 8 can change during the period of switching of the magnetic field output by the magnetic field output switching unit 16. However, since the vehicle 8 in the parking operation moves at a very low speed, if the magnetic field output switching unit 16 switches the output of the magnetic field within a very short time, the position change of the vehicle 8 can be ignored. For example, it is conceivable that the magnetic field output switching unit 16 switches the output of the magnetic field at a cycle of about 5 to 200 milliseconds.

  Further, the arithmetic circuit 25 determines the position of the vehicle 8 in the approach direction 91 during the period of switching of the magnetic field output by the magnetic field output switching unit 16 based on the moving speed of the vehicle 8 and the steering angle of the vehicle 8. It is also possible to estimate the change. In this case, the arithmetic circuit 25 corrects the distance obtained based on the distance conversion information based on the estimation result of the position change.

  In theory, there may be two intersections between the two arcs 11a and 12a. However, the charging secondary coil 21 exists on the upstream side in the approach direction 91 with respect to the position of the charging primary coil 11. Therefore, the arithmetic circuit 25 limits the range of the arc 11a and the arc 12a used for calculating the intersection to the range upstream of the approach direction 91 with respect to the position of the charging primary coil 11. As a result, the position of one charging secondary coil 21 is specified.

  FIG. 6 is an example of an information output screen for vehicle guidance in the charging device 2. The arithmetic circuit 25 in the charging device 2 outputs information on the relative position calculated by the position calculation process to the display panel 31 as vehicle guidance information in the guidance information output process. In the vehicle guidance information illustrated in FIG. 5, the image 21g of the charging secondary coil 21 and the image 11g of the charging primary coil 11 correspond to the relative positions calculated by the position calculating process. The image information is arranged as described above. In the image information, each image is arranged in a coordinate system based on the charging primary coil 11 and the sensor primary coil 12 in the parking lot 9.

  In addition, as shown in FIG. 6, the arithmetic circuit 25 moves the charging secondary coil 21 to the target position facing the charging primary coil 11 based on the image information as the guidance information. Information for notifying the moving direction and the moving amount of the vehicle 8 can also be included. In addition, the information of the moving direction and moving amount in this case is information based on a coordinate system with the parking lot 9 as a reference.

  The arithmetic circuit 25 determines the moving direction and amount of movement of the vehicle 8 for moving the charging secondary coil 21 to the target position facing the charging primary coil 11 in the guidance information output process. The voice information to be notified is output to the speaker 32 as the vehicle guidance information.

  Even when the charging device 2 is employed, the driver of the vehicle 8 refers to the guidance information presented by the guidance information output process to handle the vehicle 8 smoothly toward the target position. It becomes easy to perform the operation. Moreover, there is no need for the positioning wheel stopper that contacts the wheels of the vehicle 8 to protrude from the parking lot 9.

  Furthermore, also in the charging device 2, the primary charging coil 11, the secondary charging coil 22, and the high-frequency power generation unit 13 that are originally provided in the vehicle wireless charging device are used to detect the relative position. Is also used. As a result, the charging device 2 can realize the detection of the relative position with a simple configuration.

<Third Embodiment>
Next, the configuration of the charging device 3 according to the third embodiment of the present invention will be described with reference to FIG. The charging device 3 is different from the charging device 1 shown in FIG. 1 and the charging device 2 shown in FIG. 4 only in some components. 7, the same components as those shown in FIGS. 1 and 4 are given the same reference numerals. Hereinafter, only differences between the charging device 1 and the charging device 2 in the charging device 3 will be described.

  The charging device 3 includes the power receiving side device 20 a in the charging device 1 and the power transmission side device 10 b in the charging device 2. That is, it can be said that the charging device 3 has a configuration in which the power transmission side device 10 a is replaced with the power transmission side device 10 b of the charging device 2 in the configuration of the charging device 1. In addition, it can be said that the charging device 3 includes a configuration in which the power receiving side device 20 b is replaced with the power receiving side device 20 a of the charging device 1 in the configuration of the charging device 2.

  The primary coil for sensor 12 is a coil that is arranged at a position different from the primary coil for charging 11 in the parking lot 9 and generates a magnetic field whose magnetic force varies at a high frequency. The magnetic field output switching unit 16 switches between magnetic field output by the charging primary coil 11 and magnetic field output by the sensor primary coil 12.

  In addition, the sensor secondary coil 22 is configured such that when the vehicle 8 is parked at the target position where the charging secondary coil 21 and the charging primary coil 11 face each other, the sensor primary coil 22. It arrange | positions in the position facing the side coil 12. FIG. Then, the arithmetic circuit 25 in the charging device 3 uses the detection results of the first ammeter 26 and the second ammeter 27 corresponding to the magnetic field switched by the magnetic field output switching unit 16 to perform the charging. The relative position between the primary coil 11 for charging and the secondary coil 21 for charging is calculated.

  For example, the primary coil for sensor 12 is arranged upstream of the primary coil for charging 11 in the approach direction 91 of the vehicle 8 to the parking lot 9. Thus, the primary coil for sensor 12 is arranged upstream of the primary coil for charging 11 in the approach direction 91 of the vehicle 8 to the parking lot 9, and the vehicle 8 stops at the target position. When the primary coil for charging 11 and the secondary coil for charging 21 face each other and the primary coil for sensor 12 and the secondary coil for sensor 22 face each other in this state, the following is shown. Such a situation arises.

  That is, in the process in which the vehicle 8 travels toward the target position, both the charging secondary coil 21 and the sensor secondary coil 22 are within the range of the magnetic field of the sensor primary coil 12. The situation where the secondary coil for charging 21 exists and exists in the magnetic field range of the primary coil for charging 11 occurs at a relatively early time.

  Therefore, the arithmetic circuit 25 detects the detection result of the first ammeter 26 when the magnetic field is output from the charging primary coil 11 and the magnetic field is output from the sensor primary coil 12. The relative position is calculated using the detection results of the first ammeter 26 and the second ammeter 27. Thus, the relative position can be calculated from a relatively early point in the process of the vehicle 8 traveling toward the target position.

  Next, a specific example of the position calculation process by the arithmetic circuit 25 in the charging device 3 will be described with reference to FIG. FIG. 8 shows the primary coil 11 for charging, the primary coil 12 for sensor, the secondary coil 21 for charging, and the secondary side for sensor when the vehicle 8 is on the way to the target position in the parking lot 9. It is the figure where an example of the positional relationship of the coil 22 was represented typically. FIG. 8 is a schematic diagram when each coil is viewed from above.

  The arithmetic circuit 25 in the charging device 2 shows the detected current values of the first ammeter 26 and the second ammeter 27 when the magnetic field of the sensor primary coil 12 is output as shown in FIG. This is applied to the distance conversion information described above. Thereby, the arithmetic circuit 25 calculates two distances L31 and L32 with the center position 12p of the primary coil for sensor 12 as a base point. The distance L31 is a distance from the center position 12p to the center position 31p of the charging secondary coil 21. Similarly, the distance L32 is a distance from the center position 12p to the center position 32p of the sensor secondary coil 22.

  Further, the arithmetic circuit 25 in the charging device 2 converts the detected value of the current of the first ammeter 26 when the magnetic field of the primary coil 11 for charging is output into the distance conversion described with reference to FIG. Applies to information. Thereby, the arithmetic circuit 25 calculates a distance L33 with the center position 11p of the charging primary coil 11 as a base point. The distance L33 is a distance from the center position 11p to the center position 31p of the charging secondary coil 21. Further, the positional relationship between the two center positions 11p and 12p in the parking lot 9 is known. Here, the distance between the two center positions 11p and 12p is L0.

  In the two-dimensional coordinate system with the parking lot 9 as a reference, the arithmetic circuit 25 has an arc 33a having a radius L33 centered on the center position 11p and an arc 31a having a radius L31 centered on the center position 12p. Is calculated as the center position of the secondary coil for charging 21. Further, in the two-dimensional coordinate system with the parking lot 9 as a reference, the arithmetic circuit 25 includes an arc 32a having a radius L32 centered on the center position 12p and an arc 30a having a radius L0 centered on the intersection 31p. Is calculated as the center position of the secondary coil for sensor 22.

  The two-dimensional coordinate system with reference to the parking lot 9 has, for example, one of a direction parallel to the approach direction 91 of the vehicle 8 to the parking lot 9 and a direction perpendicular to the direction, the origin being the center position 11p. It is conceivable that the coordinate system has the X axis and the other as the Y axis.

  Theoretically, the intersection points 31p and 32p can exist at two places. However, as in the case of the charging devices 1 and 2, the approach direction 91, the positional relationship between the two primary coils 11 and 12, and the positional relationship between the two secondary coils 21 and 22 are considered. If the ranges of the arcs 30a, 31a, 32a, and 33 are limited, the positions of the two intersection points 31p and 32p are each specified as one location. Further, the problem of the change in the position of the vehicle 8 during the magnetic field switching period is solved by the method described in the charging device 2.

  The central position 31p of the charging secondary coil 21 and the central position 32p of the sensor secondary coil 22 calculated as described above are represented by a coordinate system based on the parking lot 9, and It can be said that the relative position with respect to the center position 11p of the primary coil 11 for charge is represented. The arithmetic circuit 25 in the charging device 3 calculates the relative position as described above. In addition, in the charging device 3, the positions of both the charging secondary coil 21 and the sensor secondary coil 22 are calculated. Therefore, in the said charging device 3, the direction of the vehicle 8 in the parking lot 9 is also specified.

  FIG. 9 is an example of an information output screen for vehicle guidance in the charging device 3. In the charging information output process, the arithmetic circuit 25 in the charging device 3 includes information on the positions of the two coils 11 and 21 for charging calculated by the position calculation process and the direction of the vehicle 8 in the parking lot 9. It outputs to the said display panel 31 as vehicle guidance information.

  The vehicle guidance information illustrated in FIG. 9 is such that the image 21g of the charging secondary coil 21 and the image 11g of the charging primary coil 11 correspond to the positions calculated by the position calculating process. It is the arranged image information. Furthermore, in the vehicle guidance information illustrated in FIG. 9, the image 9 g of the parking lot 9 and the image 8 g of the vehicle 8 are represented so that the position and orientation of the vehicle 8 in the parking lot 9 can be seen. In FIG. 9, each image is arranged in a coordinate system based on the parking lot 9.

  Although not shown in FIG. 9, also in the charging device 3, the arithmetic circuit 25 uses the charging secondary coil 21 as the charging primary coil 11 for the image information as the induction information. It is also possible to include information for notifying the moving direction and the moving amount of the vehicle 8 for moving to the target position opposite to.

  The arithmetic circuit 25 determines the moving direction and amount of movement of the vehicle 8 for moving the charging secondary coil 21 to the target position facing the charging primary coil 11 in the guidance information output process. The voice information to be notified is output to the speaker 32 as the vehicle guidance information. In the charging device 3, the arithmetic circuit 25 can also output information on the current inclination of the vehicle 8 relative to the vehicle 8 stopped at the target position of the parking lot 9.

  Even when the charging device 3 is employed, the driver of the vehicle 8 refers to the guidance information presented by the guidance information output process to handle the vehicle 8 smoothly toward the target position. It becomes easy to perform the operation. Moreover, there is no need for the positioning wheel stopper that contacts the wheels of the vehicle 8 to protrude from the parking lot 9.

  Further, also in the charging device 3, the primary coil 11 for charging, the secondary coil 22 for charging, and the high-frequency power generation unit 13 that are originally provided in the vehicle wireless charging device are used to detect the relative position. Is also used. As a result, the charging device 3 can realize the detection of the relative position with a simple configuration.

  Incidentally, in the example shown in FIGS. 7 and 8, the sensor primary coil 12 is arranged upstream of the charging primary coil 11 in the approach direction 91, but other arrangements are possible. It may be adopted. Further, the combination of the detection results selected as the one used for the position calculation process from the detection results of the first ammeter 26 and the second ammeter 27 obtained according to the switching of the magnetic field output is: Other combinations may be used.

  For example, the case where the said sensor primary side coil 12 is arrange | positioned in the said approach direction 91 in the position equivalent to the said primary coil 11 for charging can be considered. And the said sensor secondary side coil 22 shall be arrange | positioned in the position which opposes the said sensor primary side coil 11 when the vehicle 8 is parked in the said target position. In this case, the arithmetic circuit 25 detects the detection results of the first ammeter 26 and the second ammeter 27 when the magnetic field is output from the charging primary coil 11, and the sensor primary coil. The relative position can be calculated by using the detection result of the second ammeter 27 when the magnetic field is output from 12. In this case, the calculation method of the relative position is the same as the example shown in FIG.

  In addition, the example of the relative position calculation method described based on FIGS. 2, 5, and 7 is merely an example, and the relative position can be calculated by another method based on a basic geometric operation. Is possible.

  Moreover, in each embodiment shown above, although the example in which the said primary coil 12 for sensors and the said secondary coil 22 for sensors were each provided one each was shown, another example is also considered.

  For example, in the charging device 1, two or more secondary coils for sensors 22 are provided at different positions in the vehicle 8, and the relative position is set to each of three or more secondary coils in the vehicle 8. An example of calculation based on the detected current value can be considered. In this case, it is conceivable that the arithmetic circuit 25 selects two high current values from among three or more current value detection values and performs the position calculation process using the selected current values. Alternatively, it may be considered that the arithmetic circuit 25 calculates the average value of the relative positions calculated for each combination of two current values as the final relative position.

  Similarly, in the charging device 2, two or more primary coils for sensors 12 are provided at different positions in the parking lot 9, and the relative position is set to each of the three or more primary coils in the parking lot 9. An example of calculation based on the detection value of the first ammeter 26 corresponding to the magnetic field can be considered.

  Similarly, in the charging device 3, two or more primary coils for sensors 12 are provided at different positions in the parking lot 9, and two or more secondary coils for sensors 22 corresponding to them are provided. Examples provided at different positions in the vehicle 8 are also conceivable. In this case, the relative position is calculated based on the detected current value of each of the three or more secondary coils obtained corresponding to the magnetic field output of each of the three or more primary coils in the parking lot 9. .

  In the charging devices 1 and 3, one or both of the charging secondary coil 21 and the sensor secondary coil 22 may be provided on a tire wheel of the vehicle 8. Similarly, in the charging device 2, it is conceivable that the charging secondary coil 21 is provided on a tire wheel of the vehicle 8.

  FIG. 10 is a diagram illustrating an example of the arrangement of coils in the charging device 3. The example shown in FIG. 10 is an example in which the secondary coil for charging 21 is arranged on the tire wheel of the vehicle 8 and the secondary coil for sensor 22 is arranged on the bottom surface of the vehicle 8. In this case, the secondary coil for charging 21 is arranged in a state of standing upright in the tire wheel. In addition, the sensor secondary coil 22 is arranged in the state of being laid down in the lateral direction on the bottom surface of the vehicle 8 as in the above-described embodiment.

  As the configuration in which the secondary coil for charging 21 is disposed on the tire wheel, the following configuration is conceivable. For example, it is conceivable that the entire charging secondary coil 21 is disposed on a tire wheel. In this case, it is conceivable that the secondary coil for charging 21 is supported relatively rotatably with respect to the tire wheel. This means that the secondary coil for charging 21 is supported so as not to follow the rotating tire wheel. Thereby, even if the tire wheel rotates, the state where the secondary coil for charging 21 and the charging circuit 23 are electrically connected is maintained.

  Further, only the secondary side self-resonant coil 211 in the secondary coil for charging 21 is supported by the tire wheel, and the secondary side electromagnetic induction coil 212 is supported at a position facing the tire wheel in the main body of the vehicle 8. It can also be considered.

  On the other hand, the charging primary side coil 11 corresponding to the charging secondary side coil 21 is held in a vertical state in the parking lot 9 so as to face the charging secondary side coil 21. Yes. Even when the height from the ground to the bottom surface of the vehicle 8 is high due to the arrangement of the coils as shown in FIG. 10, the charging primary coil 11 and the charging secondary coil 21 during charging are used. The distance between can be reduced. As a result, charging efficiency is further increased.

  The present invention can be used for a vehicle wireless charging apparatus.

1-3 Vehicle wireless charging device (charging device)
DESCRIPTION OF SYMBOLS 8 Vehicle 9 Parking lot 10a, 10b Power transmission side device 11 Charging primary side coil 12 Sensor primary side coil 13 High frequency power generation unit 14 Power supply control unit 15 AC power source 16 Magnetic field output switching unit 20a, 20b Power receiving side device 21 Two for charging Secondary coil 22 Sensor secondary coil 23 Charging circuit 24 Battery 25 Arithmetic circuit 26 Ammeter 27 Ammeter 31 Display panel 32 Speaker 91 Entrance direction 111 Primary side self-resonant coil 112 Primary side electromagnetic induction coil 211, 221 Secondary side Self-resonant coil 212, 222 Secondary side electromagnetic induction coil

Claims (6)

  1. A primary coil for charging, which is provided in a parking lot and emits a magnetic field whose magnetic force fluctuates, a secondary coil for charging, which is provided in a vehicle and receives power from the primary coil for charging by radio, and provided in the vehicle. A charging unit for charging the rechargeable battery with the electric power obtained by the secondary coil for charging, and a wireless charging device for a vehicle comprising:
    A secondary coil for a sensor that is provided at a position different from the secondary coil for charging in the vehicle and receives power wirelessly from a coil that generates a magnetic field whose magnetic force varies in the parking lot;
    A first power detection unit that detects the intensity of power obtained by the secondary coil for charging;
    A second power detection unit for detecting the intensity of power obtained by the secondary coil for sensors;
    A position calculation unit that calculates a relative position between the primary coil for charging and the secondary coil for charging, using detection results of the first power detection unit and the second power detection unit;
    An information output unit that outputs information on the relative position calculated by the position calculation unit;
    A primary coil for a sensor that is provided at a position different from the primary coil for charging in the parking lot and emits a magnetic field whose magnetic force varies;
    A magnetic field output switching unit that switches between the output of the magnetic field by the primary coil for charging and the output of the magnetic field by the primary coil for sensor,
    The position calculation unit uses the detection results of the first power detection unit and the second power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit, and uses the primary coil for charging and the charging coil. A wireless charging device for a vehicle , wherein a relative position between the secondary coil and the secondary coil is calculated .
  2. The primary coil for sensor is disposed on the upstream side of the primary coil for charging in the approach direction of the vehicle to the parking lot,
    The sensor secondary coil is located at a position facing the sensor primary coil when the vehicle is parked at a target position where the charging secondary coil and the charging primary coil face each other. Placed in
    The position calculation unit includes a detection result of the first power detection unit when the magnetic field is output from the primary coil for charging, and the first when the magnetic field is output from the sensor primary coil. The relative position is calculated using a detection result of each of the power detection unit and the second power detection unit,
    The wireless charging device for a vehicle according to claim 1.
  3.   A primary coil for charging, which is provided in a parking lot and emits a magnetic field whose magnetic force fluctuates, a secondary coil for charging, which is provided in a vehicle and receives power from the primary coil for charging by radio, and provided in the vehicle. A charging unit for charging the rechargeable battery with the electric power obtained by the secondary coil for charging, and a wireless charging device for a vehicle comprising:
      A primary coil for a sensor that is provided at a position different from the primary coil for charging in the parking lot and emits a magnetic field whose magnetic force varies;
      A magnetic field output switching unit that switches between output of the magnetic field by the primary coil for charging and output of the magnetic field by the primary coil for sensor;
      A first power detection unit that detects the intensity of power obtained by the secondary coil for charging;
      A position for calculating a relative position between the primary coil for charging and the secondary coil for charging using the detection result of the first power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit. A calculation unit;
      An information output unit that outputs information on the relative position calculated by the position calculation unit;
      A secondary coil for a sensor that is provided at a position different from the secondary coil for charging in the vehicle and receives power wirelessly from a coil that generates a magnetic field whose magnetic force varies in the parking lot;
      A second power detection unit that detects the strength of the power obtained by the secondary coil for the sensor,
      The position calculation unit uses the detection results of the first power detection unit and the second power detection unit corresponding to the magnetic field switched by the magnetic field output switching unit, and uses the primary coil for charging and the charging coil. A wireless charging device for a vehicle, wherein a relative position between the secondary coil and the secondary coil is calculated.
  4. In the situation where the charging unit does not charge the rechargeable battery, the position detection unit calculates the relative position using the detection result of the power detection unit in the operation mode of the vehicle wireless charging device. An operation mode switching unit that switches between a position detection mode and a charging mode in which charging of the rechargeable battery is performed by the charging unit;
    The wireless charging device for a vehicle according to any one of claims 1 to 3 .
  5. The secondary coil for charging is
    A secondary self-resonant coil that receives power from the charging primary coil by being magnetically coupled to the charging primary coil by magnetic field resonance;
    A secondary-side electromagnetic induction coil that receives power from the secondary self-resonant coil by electromagnetic induction,
    The vehicle wireless charging device according to any one of claims 1 to 4 .
  6. The information output unit outputs an image of the information on the relative position calculated by the position calculation unit to a display unit provided in the vehicle.
    The wireless charging device for a vehicle according to any one of claims 1 to 5 .
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