Wireless power supply system and wireless power reception device

• US 10,399,446 B2
• Filed: 04/08/2014
• Issued: 09/03/2019
• Est. Priority Date: 04/08/2014
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Tsukamoto, Yukinori
• Primary Examiner(s): Isla, Richard
• Assistant Examiner(s): Bui, Dung V
• Application Number:
  US15/302,038
• Publication Number:
  US 20170113557A1
• Time in Patent Office: 1,974 Days
• Field of Search: 320108
• CPC Class Codes: B60L 50/50 using propulsion power supplied by batteries or fuel cells
• 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 53/30 Constructional details of charging stations
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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 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

Abstract

When a vehicle approaches a parking space, a ground controller sets a power transmission coil to first excitation in which the power transmission coil is excited in an excitation pattern containing identification data. A vehicle controller pre-charges a capacitor connected to a power reception coil after the vehicle approaches the parking space. Further, the vehicle controller acquires the identification data when the power transmission coil is in the first excitation, and transmits the acquired identification data to the ground unit. The ground controller pairs a power transmission device and a power reception device with each other if the identification data contained in the excitation pattern and the identification data acquired by the vehicle controller match each other.

Claims

1. A wireless power supply system comprising:

at least one power transmission device provided on a ground and configured to transmit power; and

a power reception device provided to a vehicle and configured to receive power transmitted from the at least one power transmission device and supply the power to an electric load,

wherein the at least one power transmission device includes

a power transmission coil provided at a parking space and configured to transmit power,

a ground controller configured to control power to be supplied to the power transmission coil, and

a power-transmission-side wireless device configured to communicate with the power reception device,

the power reception device includes

a power reception coil configured to receive power transmitted from the power transmission coil and supply the received power to the electric load through a capacitor,

a vehicle controller configured to control power reception of the power reception coil, and

a power-reception-side wireless device configured to communicate with the at least one power transmission device,

when the vehicle approaches the parking space, the ground controller sets the power transmission coil to a first excitation in which the power transmission coil is excited in an excitation pattern containing identification data,

the vehicle controller

pre-charges the capacitor after the vehicle approaches the parking space before the power transmission coil is set to the first excitation,

acquires the identification data when the power transmission coil is in the first excitation, and

transmits the acquired identification data to the at least one power transmission device, and

the ground controller pairs the at least one power transmission device and the power reception device with each other when the identification data contained in the excitation pattern and the identification data acquired by the vehicle controller match each other.

2. The wireless power supply system according to claim 1, wherein when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from power received by the power reception coil.

3. The wireless power supply system according to claim 1,

wherein the power reception device further includes a central subcoil that is provided near the power reception coil and configured to receive power transmitted from the power transmission coil, and

when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from the power received by the central subcoil.

4. The wireless power supply system according to claim 3, wherein

the power reception device further includes at least one peripheral subcoil that is provided around the power reception coil and configured to receive power transmitted from the power transmission coil without being affected by current flowing in the power reception coil,

when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from the power received by the at least one peripheral subcoil and transmits the acquired identification data to the at least one power transmission device,

when the identification data contained in the excitation pattern and the identification data received by the at least one peripheral subcoil match each other, the ground controller pairs the at least one power transmission device and the power reception device with each other, and then sets the power transmission coil to a second excitation for determining whether or not the vehicle is present at a chargeable position in the parking space, and

the vehicle controller determines whether or not the vehicle is present at the chargeable position in the parking space, from the power received by the central subcoil.

5. The wireless power supply system according to claim 1, wherein the identification data comprises a vehicle ID of the vehicle.

6. A wireless power reception device provided to a vehicle and configured to wirelessly receive power transmitted from a power transmission device provided on a ground, the wireless power reception device comprising:

a power reception coil configured to receive power transmitted from the power transmission device and supply the received power to an electric load through a capacitor,

a vehicle controller configured to control power reception of the power reception coil, and

a power-reception-side wireless device configured to communicate with the power transmission device,

wherein the vehicle controller

pre-charges the capacitor after the vehicle approaches a parking space,

acquires identification data when a power transmission coil provided to the power transmission device is set to a first excitation in which the power transmission coil is excited in an excitation pattern containing the identification data, and

transmits the acquired identification data to the power transmission device,

wherein the vehicle controller pre-charges the capacitor before receiving the identification data.

7. The wireless power reception device according to claim 6, wherein when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from power received by the power reception coil.

8. The wireless power reception device according to claim 6, further comprising a central subcoil provided near the power reception coil and configured to receive power transmitted from the power transmission coil, wherein

when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from the power received by the central subcoil.

9. The wireless power reception device according to claim 8, further comprising at least one peripheral subcoil provided around the power reception coil and configured to receive power transmitted from the power transmission coil without being affected by current flowing in the power reception coil, wherein

when the power transmission coil is in the first excitation, the vehicle controller acquires the identification data from the power received by the at least one peripheral subcoil and transmits the acquired identification data to the power transmission device, and

when the power transmission coil is in second excitation for determining whether or not the vehicle is present at a chargeable position in the parking space, the vehicle controller determines whether or not the vehicle is present at the chargeable position in the parking space, from voltage received by the central subcoil.

10. The wireless power reception device according to claim 6, wherein the identification data comprises a vehicle ID of the vehicle.