Contactless power transmitting device, contactless power receiving device, and contactless power transfer system

• US 9,379,572 B2
• Filed: 04/29/2013
• Issued: 06/28/2016
• Est. Priority Date: 06/14/2012
• Status: Active Grant

• Current Assignee: Tohoku University National Universities Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Tohoku University National Universities Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takura, Tetsuya, Sato, Fumihiro, Ichikawa, Shinji, Matsuki, Hidetoshi
• Primary Examiner(s): Rodas, Richard Isla
• Assistant Examiner(s): Henze-Gongola, David V
• Application Number:
  US13/872,672
• Publication Number:
  US 20130335015A1
• Time in Patent Office: 1,156 Days
• Field of Search: 320/108, 307/104
• US Class Current: 1/1
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/70 Interactions with external data bases, e.g. traffic centres
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/62 charged by low-power generators primarily intended to support the batteries, e.g. range extenders
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/305 Communication interfaces
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/05 : using capacitive coupling
• CPC Class Codes: H02J 50/12 : of the resonant type
• CPC Class Codes: H02J 50/80 : involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 : involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 : Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A power transmitting device includes: a power transmitting unit being able to contactlessly transmit electric power to a power receiving unit of a power receiving device; and a guide unit changing a guide position of the power receiving device at power reception of the power receiving device on the basis of a type of the power receiving unit. The guide unit may when the types of the power receiving and transmitting units are the same, set a position of the power receiving unit, at which center positions of the power receiving and transmitting units coincide with each other, for the guide position, and, when the types of the power receiving and transmitting units are different, set a position of the power receiving unit, at which the center positions of the power receiving and transmitting units deviate from each other, for the guide position.

Claims

1. A contactless power transmitting device comprising:

a power transmitting unit configured to contactlessly transmit electric power to a power receiving unit installed in a power receiving device, the power receiving unit including a coil; and

a guide unit configured to change a guide position of the power receiving device on the basis of a type of the coil included in the power receiving unit, the power receiving device being guided to the guide position at the time when the power receiving device receives electric power, wherein

the guide unit is configured to, in the case where the type of the coil and a type of the power transmitting unit are the same, set a position of the power receiving unit, at which a center position of the power receiving unit coincides with a center position of the power transmitting unit, for the guide position, and

the guide unit is configured to, in the case where the type of the coil and the type of the power transmitting unit are different from each other, set a position of the power receiving unit, at which the center position of the power receiving unit deviates from the center position of the power transmitting unit, for the guide position.

2. The vehicle according to claim 1, wherein

the type of each of the power transmitting unit and the coil is classified on the basis of a structure of a component of the power transmitting unit the structure influencing a magnetic flux distribution generated in the power transmitting unit and the power receiving unit at the time of transmission of electric power.

3. The contactless power transmitting device according to claim 1, wherein

the guide unit is configured to, in the case where the type of the coil is a polarized coil type, determine the guide position in consideration of an orientation in which the power receiving unit is installed in the power receiving device.

4. The contactless power transmitting device according to claim 1, wherein

the power receiving device is a vehicle, and the guide unit is configured to inform a parking position at the time when the vehicle receives electric power to a user of the vehicle as the guide position.

5. The contactless power transmitting device according to claim 1, wherein

the power receiving device is a vehicle, and the guide unit is configured to assist in parking the vehicle such that a parking position at the time when the vehicle receives electric power is determined.

6. The contactless power transmitting device according to claim 1, wherein

a difference between the natural frequency of the power transmitting unit and the natural frequency of the power receiving unit falls within the range of ±

10%.

7. The contactless power transmitting device according to claim 1, wherein

a coupling coefficient between the power receiving unit and the power transmitting unit is smaller than or equal to 0.1.

8. The contactless power transmitting device according to claim 1, wherein

the power transmitting unit is configured to transmit electric power to the power receiving unit through at least one of a magnetic field and an electric filed, the magnetic field being formed between the power receiving unit and the power transmitting unit, the magnetic field oscillating at a predetermined frequency, the electric field being formed between the power receiving unit and the power transmitting unit, and the electric field oscillating at a predetermined frequency.

9. A contactless power receiving device that is contactlessly chargeable from a power transmitting device, comprising:

a power receiving unit configured to contactlessly receive electric power from a power transmitting unit installed in the power transmitting device;

the power transmitting unit including a coil; and

a guide unit configured to change a guide position of the power receiving device on the basis of a type of the power transmitting unit, the power receiving device being guided to the guide position at the time when the power receiving device receives electric power, wherein

the guide unit is configured to, in the case where a type of the power receiving unit and the type of the coil are the same, set a position of the power receiving unit, at which a center position of the power receiving unit coincides with a center position of the power transmitting unit, for the guide position, and

the guide unit is configured to, in the case where the type of the power receiving unit and the type of the coil are different, set a position of the power receiving unit, at which the center position of the power receiving unit deviates from the center position of the power transmitting unit, for the guide position.

10. The contactless power receiving device according to claim 9, wherein

the type of each of the power transmitting unit and the power receiving unit is classified on the basis of a structure of a component of the power transmitting unit or the power receiving unit, the structure influencing a magnetic flux distribution generated in the power transmitting unit and the power receiving unit at the time of reception of electric power.

11. The contactless power receiving device according to claim 9, wherein

the guide unit is configured to, in the case where the type of the coil is a polarized coil type, determine the guide position in consideration of an orientation in which the power transmitting unit is installed in the power transmitting device.

12. The contactless power receiving device according to claim 9, wherein

the power receiving device is a vehicle, and the guide unit is configured to inform a parking position at the time when the vehicle receives electric power to a user of the vehicle as the guide position.

13. The contactless power receiving device according to claim 9, wherein

the power receiving device is a vehicle, and the guide unit is configured to assist in parking the vehicle such that a parking position at the time when the vehicle receives electric power is determined.

14. The contactless power receiving device according to claim 9, wherein

a difference between the natural frequency of the power transmitting unit and the natural frequency of the power receiving unit falls within the range of ±

10%.

15. The contactless power receiving device according to claim 9, wherein

a coupling coefficient between the power receiving unit and the power transmitting unit is smaller than or equal to 0.1.

16. The contactless power receiving device according to claim 9, wherein

the power receiving unit is configured to receive electric power from the power transmitting unit through at least one of a magnetic field and an electric field, the magnetic field being formed between the power receiving unit and the power transmitting unit, the magnetic field oscillating at a predetermined frequency, the electric field being formed between the power receiving unit and the power transmitting unit, and the electric field oscillating at a predetermined frequency.

17. A contactless power transfer system comprising:

a power receiving device; and

a power transmitting device including;

a power transmitting unit configured to contactlessly transmit electric power to a power receiving unit installed in the power receiving device, the power receiving unit including a coil; and

a guide unit configured to change a guide position of the power receiving device on the basis of a type of the power receiving unit, the power receiving device being guided to the guide position at the time when the power receiving device receives electric power, and the power transmitting device being configured to contactlessly transmit electric power to the power receiving device, wherein

the guide unit is configured to, in the case where the type of the coil and a type of the power transmitting unit are the same, set a position of the power receiving unit, at which a center position of the power receiving unit coincides with a center position of the power transmitting unit, for the guide position, and

the guide unit is configured to, in the case where the type of the coil and the type of the power transmitting unit are different from each other, set a position of the power receiving unit, at which the center position of the power receiving unit deviates from the center position of the power transmitting unit, for the guide position.

18. A contactless power transfer system comprising:

a power transmitting device; and

a power receiving device including;

a power receiving unit configured to contactlessly receive electric power from a power transmitting unit installed in the power transmitting device, the power transmitting unit including a coil; and

a guide unit configured to change a guide position on the basis of a type of the coil included in the power transmitting unit, the power receiving device being guided to the guide position at the time when the power receiving device receives electric power, and the power receiving device being configured to contactlessly receive electric power from the power transmitting device, wherein

the guide unit is configured to, in the case where a type of the power receiving unit and the type of the coil are the same, set a position of the power receiving unit, at which a center position of the power receiving unit coincides with a center position of the power transmitting unit, for the guide position, and

the guide unit is configured to, in the case where the type of the power receiving unit and the type of the coil are different, set a position of the power receiving unit, at which the center position of the power receiving unit deviates from the center position of the power transmitting unit, for the guide position.