Non-contact electric power reception device, non-contact electric power transmission device, and non-contact electric power transmission and reception system

• US 9,697,952 B2
• Filed: 10/27/2011
• Issued: 07/04/2017
• Est. Priority Date: 10/27/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Horiuchi, Satoru, Ichikawa, Shinji
• Primary Examiner(s): Johnson, Ryan
• Application Number:
  US14/352,516
• Publication Number:
  US 20140285029A1
• Time in Patent Office: 2,077 Days
• 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 2220/14 Synchronous machines
• 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 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 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 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 : with provisions for charging different types of batteries
• 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

The non-contact electric power reception device includes an electric power reception portion and an electric load device. The electric power reception portion is configured such that best transmission efficiency at a power supply frequency of the power supply portion used for non-contact electric power transmission is achieved when the electric power reception portion is arranged with its position being displaced from a position of the electric power transmission portion. Preferably, the electric power reception portion is configured such that a peak frequency at which transmission efficiency at the time of change in power transmission frequency exhibits a peak and a power supply frequency match with each other when the electric power reception portion is arranged with positions in a horizontal direction of a central axis of the electric power reception portion and a central axis of the electric power transmission portion being displaced from each other.

Claims

1. A non-contact electric power reception device for receiving in a non-contact manner, electric power transferred from an electric power transmission device, said electric power transmission device including an electric power transmission portion and a power supply portion for supplying AC power to said electric power transmission portion, comprising:

an electric power reception portion configured to receive electric power in a non-contact manner from said electric power transmission portion; and

an electric load device configured to use electric power received by said electric power reception portion,

said electric power reception portion including a resonant coil and an induction coil,

a distance between said resonant coil and said induction coil of said electric power reception portion being set to achieve higher transmission efficiency at a predetermined power supply frequency of said power supply portion used for non-contact electric power transmission when said electric power reception portion is arranged with its position being displaced by a predetermined distance from a position of said electric power transmission portion than in the case when said electric power reception portion and said electric power transmission portion are aligned, and

said electric power reception portion being configured such that when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other, a peak frequency at which transmission efficiency as a function of electric power transmission frequency exhibits a peak and said predetermined power supply frequency match with each other.

2. The non-contact electric power reception device according to claim 1, wherein

said electric power reception portion is configured to have peaks at which transmission efficiency is higher than transmission efficiency at said power supply frequency, at least two locations of a first frequency higher than said power supply frequency and a second frequency lower than said power supply frequency, when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion matching with each other.

3. The non-contact electric power reception device according to claim 2, further comprising:

a matching device provided between said electric power reception portion and said electric load device, for adjusting impedance of said non-contact electric power reception device; and

a control device causing said matching device to adjust impedance of said non-contact electric power reception device when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion matching with each other.

4. The non-contact electric power reception device according to claim 2, further comprising:

a matching device provided between said electric power reception portion and said electric load device, for adjusting impedance of said non-contact electric power reception device; and

a control device causing said matching device to adjust impedance of said non-contact electric power reception device when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion being displaced from each other.

5. The non-contact electric power reception device according to claim 1, further comprising:

a matching device provided between said electric power reception portion and said electric load device, for adjusting impedance of said non-contact electric power reception device; and

a control device causing said matching device to adjust impedance of said non-contact electric power reception device when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion matching with each other.

6. The non-contact electric power reception device according to claim 1, further comprising:

a matching device provided between said electric power reception portion and said electric load device, for adjusting impedance of said non-contact electric power reception device; and

a control device causing said matching device to adjust impedance of said non-contact electric power reception device when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other.

7. The non-contact electric power reception device according to claim 1, wherein

said electric power reception portion is configured such that a difference in natural frequency from said electric power transmission portion is within ±

10%.

8. The non-contact electric power reception device according to claim 1, wherein

a coefficient of coupling between said electric power reception portion and said electric power transmission portion is not greater than 0.1.

9. The non-contact electric power reception device according to claim 1, wherein

said electric power transmission portion transmits electric power to said electric power reception portion through at least one of magnetic field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency and electric field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency.

10. A non-contact electric power transmission device for transmitting electric power in a non-contact manner to an electric power reception device, said electric power reception device including an electric power reception portion and an electric load device configured to receive electric power from said electric power reception portion, comprising:

an electric power transmission portion configured to transmit electric power in a non-contact manner to said electric power reception portion; and

a power supply portion configured to supply AC power to said electric power transmission portion,

said electric power transmission portion including a resonant coil and an induction coil,

a distance between said resonant coil and said induction coil of said electric power transmission portion being set to achieve higher transmission efficiency at a predetermined power supply frequency of said power supply portion used for non-contact electric power transmission when said electric power reception portion is arranged in a state that its position is displaced by a predetermined distance from a position of said electric power transmission portion than in the case when said electric power reception portion and said electric power transmission portion are aligned, and

said electric power transmission portion is configured such that a peak frequency at which transmission efficiency at time of change in electric power transmission frequency exhibits a peak and said power supply frequency match with each other when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other.

11. The non-contact electric power transmission device according to claim 10, wherein

said electric power transmission portion is configured to have peaks at which transmission efficiency is higher than transmission efficiency at said power supply frequency, a at least two locations of a first frequency higher than said power supply frequency and a second frequency lower than said power supply frequency, when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion matching with each other.

12. The non-contact electric power transmission device according to claim 11, further comprising:

a matching device provided between said electric power transmission portion and said power supply portion, for adjusting impedance of said non-contact electric power transmission device; and

a control device causing said matching device to adjust impedance of said non-contact electric power transmission device when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion matching with each other.

13. The non-contact electric power transmission device according to claim 11, further comprising:

a matching device provided between said electric power transmission portion and said power supply portion, for adjusting impedance of said non-contact electric power transmission device; and

a control device causing said matching device to adjust impedance of said non-contact electric power transmission device when said electric power reception portion is arranged with positions in the horizontal direction of the central axis of said electric power reception portion and the central axis of said electric power transmission portion being displaced from each other.

14. The non-contact electric power transmission device according to claim 10, further comprising:

a matching device provided between said electric power transmission portion and said power supply portion, for adjusting impedance of said non-contact electric power transmission device; and

a control device causing said matching device to adjust impedance of said non-contact electric power transmission device when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion matching with each other.

15. The non-contact electric power transmission device according to claim 10, further comprising:

a matching device provided between said electric power transmission portion and said power supply portion, for adjusting impedance of said non-contact electric power transmission device; and

a control device causing said matching device to adjust impedance of said non-contact electric power transmission device when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other.

16. The non-contact electric power transmission device according to claim 10, wherein

said electric power transmission portion is configured such that a difference in natural frequency from said electric power reception portion is within ±

10%.

17. The non-contact electric power transmission device according to claim 10, wherein

a coefficient of coupling between said electric power reception portion and said electric power transmission portion is not greater than 0.1.

18. The non-contact electric power transmission device according to claim 10, wherein

said electric power transmission portion transmits electric power to said electric power reception portion through at least one of magnetic field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency and electric field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency.

19. A non-contact electric power transmission and reception system, comprising:

a non-contact electric power transmission device; and

a non-contact electric power reception device configured to receive in a non-contact manner, electric power transferred from said non-contact electric power transmission device,

said non-contact electric power transmission device including

an electric power transmission portion, and

a power supply portion for supplying AC power to said electric power transmission portion,

said non-contact electric power reception device including

an electric power reception portion equal in natural frequency to said electric power transmission portion, and

an electric load device configured to use electric power received by said electric power reception portion, and

said electric power reception portion including a resonant coil and an induction coil,

a distance between said resonant coil and said induction coil of said electric power reception portion being set to achieve higher transmission efficiency at a predetermined power supply frequency of said power supply portion used in non-contact electric power transmission when said electric power reception portion is arranged with its position being displaced by a predetermined distance from a position of said electric power transmission portion than in the case when said electric power reception portion and said electric power transmission portion are aligned, and

said electric power reception portion being, configured such that when said electric power reception portion is arranged with positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other, a peak frequency a which transmission efficiency as a function of electric power transmission frequency exhibits a peak and said predetermined power supply frequency match with each other.

20. The non-contact electric power transmission and reception system according to claim 19, wherein

said electric power reception portion is configured such that a difference in natural frequency from said electric power transmission portion is within ±

10%.

21. The non-contact electric power transmission and reception system according to claim 19, wherein

a coefficient of coupling between said electric power reception portion and said electric power transmission portion is not greater than 0.1.

22. The non-contact electric power transmission and reception system according to claim 19, wherein

said electric power transmission portion transmits electric power to said electric power reception portion through at least one of magnetic field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency and electric field formed between said electric power reception portion and said electric power transmission portion and oscillating at a specific frequency.