Non-contact power reception device and vehicle including the same

• US 9,827,976 B2
• Filed: 10/09/2008
• Issued: 11/28/2017
• Est. Priority Date: 10/09/2008
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): DHILLON, JAGDEEP S
• Application Number:
  US13/122,625
• Publication Number:
  US 20110181123A1
• Time in Patent Office: 3,337 Days
• Field of Search: 307104, 307157, 315225, 315119, 315277, 363 50, 363 56, 340448, 340442, 340445, 73708, 73715, 73723, 325 64, 325 37, 325113, 325394, 325 26, 331179, 331 2, 331 8, 331 10, 331 11, 331 16- 18, 331 25
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 1/04 of the electric storage means for propulsion exchanging batteries for electric propulsion of vehicles B60L53/80; for auxiliary purposes only B60R16/04; supplying batteries to, or removing batteries from, vehicles B60S5/06
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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

A non-contact power reception device includes a load such as a power storage device identified as a subject of power feeding, and a secondary self-resonant coil receiving electric power to be supplied to said load from an external primary self-resonant coil. The secondary self-resonant coil is configured so as to be switchable between a first state and a second state. The first state is selected in a power reception mode in which the secondary self-resonant coil is magnetically coupled with the primary self-resonant coil through resonance of a magnetic field. The second state is selected in a power non-reception mode in which the magnetic coupling of the secondary self-resonant coil with the primary self-resonant coil through resonance is weaker than in the first state.

Claims

1. A non-contact power reception device comprising:

a load to which electric power is fed, and

a receiving coil receiving electric power to be supplied to said load from an external transmission coil,

said receiving coil having a switching portion configured to switch between a first state and a second state, said first state being selected in a power reception mode in which said receiving coil is magnetically coupled with said transmission coil through resonance of a magnetic field, and said second state being selected in a power non-reception mode in which magnetic coupling of said receiving coil with said transmission coil through resonance is weaker than in said first state,

said receiving coil having an impedance differing between said first state and said second state,

said receiving coil including a coil body, said coil body being divided at a central region into a first portion and a second portion, and

said switching portion including an inductance modifier modifying an inductance of said coil body, said inductance modifier including a relay provided at the central region of said coil body, connecting and disconnecting said first portion and said second portion in a power reception mode and a power non-reception mode, respectively.

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

a voltage converter voltage-converting an input voltage for supply to said load, and

a rectifier rectifying AC voltage and providing the rectified voltage to said voltage converter as said input voltage,

wherein said receiving coil receives electric power from said transmission coil, and generates said AC voltage to be supplied to said rectifier.

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

said non-contact power reception device is mounted on a vehicle, and receives electric power from said external transmission coil,

said non-contact power reception device further comprising a control unit performing control to switch said receiving coil between said first state and said second state,

wherein said control unit sets said receiving coil at said first state and at said second state when said vehicle meets and not meets a power reception condition, respectively.

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

said vehicle includes a power storage device receiving charge electric power from said non-contact power reception device as said load,

said power reception condition includes the condition that a state of charge of said power storage device is less than a threshold value.

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

said power reception condition includes the condition that a predetermined failure is not occurring at said vehicle.

10. A vehicle comprising the non-contact power reception device according to claim 1.

2. A non-contact power reception device comprising:

a load to which electric power is fed, and

a receiving coil receiving electric power to be supplied to said load from an external transmission coil,

said receiving coil having a switching portion configured to switch between a first state and a second state, said first state being selected in a power reception mode in which said receiving coil is magnetically coupled with said transmission coil through resonance of a magnetic field, and said second state being selected in a power non-reception mode in which magnetic coupling of said receiving coil with said transmission coil through resonance is weaker than in said first state,

said receiving coil including a coil body, and

said switching portion including a capacitance modifier modifying a capacitance of said coil body, said capacitance modifier including

a leading line connected to an end of said coil body,

a relay connected to said leading line, and

a capacitor connected to said coil body via said leading line by said relay in a power reception mode, and disconnected from said coil body by said relay in a power non-reception mode.

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

a discharging resistor for setting said capacitor at a discharging state in a power non-reception mode.

4. The non-contact power reception device according to claim 3, further comprising

another relay disconnecting said discharging resistor from said capacitor in a power reception mode, and connecting said discharging resistor with said capacitor in a power non-reception mode.

5. The non-contact power reception device according to claim 3, wherein

said relay disconnects said discharging resistor from said capacitor in a power reception mode, and connects said discharging resistor with said capacitor in a power non-reception mode.

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

a voltage converter voltage-converting an input voltage for supply to said load, and

a rectifier rectifying AC voltage and providing the rectified voltage to said voltage converter as said input voltage,

wherein said receiving coil receives electric power from said transmission coil, and generates said AC voltage to be supplied to said rectifier.

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

said non-contact power reception device is mounted on a vehicle, and receives electric power from said external transmission coil,

said non-contact power reception device further comprising a control unit performing control to switch said receiving coil between said first state and said second state,

wherein said control unit sets said receiving coil at said first state and at said second state when said vehicle meets and not meets a power reception condition, respectively.

13. The non-contact power reception device according to claim 12, wherein

said vehicle includes a power storage device receiving charge electric power from said non-contact power reception device as said load,

said power reception condition includes the condition that a state of charge of said power storage device is less than a threshold value.

14. The non-contact power reception device according to claim 12, wherein

said power reception condition includes the condition that a predetermined failure is not occurring at said vehicle.

15. A vehicle comprising the non-contact power reception device according to claim 2.