POWER RECEIVING DEVICE, POWER TRANSMITTING DEVICE, AND POWER TRANSFER SYSTEM

• US 20140240947A1
• Filed: 09/28/2011
• Published: 08/28/2014
• Est. Priority Date: 09/28/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakamura, Koji, Ichikawa, Shinji, Nakamura, Toru
• Granted Patent: US 9,536,654 B2
• Time in Patent Office: Days
• US Class Current: 361/818
• 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 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• 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: H01F 27/363 made of electrically conductive material
• 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 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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

Abstract

A power receiving device includes: a power receiving unit receiving electric power from an external power transmitting unit contactlessly; a first coil; a first shielding wall surrounding the first coil; a first device; a first shielding casing having the first device accommodated therein, the first shielding casing being also disposed inside the first shielding wall; and a first wiring connected to the first device and extending from inside the first shielding casing to outside the first shielding casing, and also pulled outside the first shielding wall, the first shielding casing having an external surface including a first opposite portion closer to the first shielding wall than the first coil, the first shielding wall having a first region opposite to the first opposite portion, the first region having a first hole, the first wiring being pulled outside the first shielding wall through the first hole.

Claims

1. A power receiving device comprising:

a power receiving unit receiving electric power from an external power transmitting unit contactlessly;

a first coil provided in said power receiving unit;

a first shielding wall surrounding said first coil and defining a region in which an electromagnetic field formed around said first coil is radiated;

a first device accommodated inside said first shielding wall;

a first shielding casing having said first device accommodated therein, said first shielding casing being also disposed inside said first shielding wall; and

a first wiring connected to said first device and extending from inside said first shielding casing to outside said first shielding casing, and also pulled outside said first shielding wall,

said first shielding casing having an external surface including a first opposite portion closer to said first shielding wall than said first coil,

said first shielding wall having a first region opposite to said first opposite portion, said first region having a first hole,

said first being pulled outside said first shielding wall through said first hole.

2. The power receiving device according to claim 1, wherein said first shielding casing is disposed to have said first opposite portion in contact with said first shielding wall at a portion having said first region, and said first wiring is pulled out of said first shielding casing at a portion having said first shielding casing and said first shielding wall in contact with each other.

3. The power receiving device according to claim 2, wherein when said first region and said first wiring are observed inside said first shielding wall in a direction in which said first shielding casing and said first region are aligned, a portion of said first wiring located between said first shielding casing and said first hole is located in said first region.

4. The power receiving device according to claim 1, wherein:

said first shielding casing includes a first projection introduced into said first hole; and

said first wiring passes through said first projection and is pulled outside said first shielding wall.

5. The power receiving device according to claim 1, wherein said first hole and said first coil have a distance therebetween larger than that between said first shielding wall and said first coil.

6. The power receiving device according to claim 1, wherein:

said power receiving unit includes a first capacitor connected to said first coil; and

said first hole and said first capacitor have a distance therebetween larger than that between said first capacitor and said first shielding wall.

7. The power receiving device according to claim 1, further comprising a first electromagnetic induction coil receiving electric power from said first coil through electromagnetic induction, wherein:

said first device is a rectifier body connected to said first electromagnetic induction coil; and

said first wiring passes a current rectified by said rectifier body.

8. The power receiving device according to claim 1, wherein:

said first shielding wall includes a top disposed under a floor panel of a vehicle, and a surrounding side wall hanging downward from said top; and

said first hole is formed through said top.

9. The power receiving device according to claim 1, wherein said power transmitting unit and said power receiving unit have natural frequencies, respectively, with a difference equal to or smaller than 10% of the natural frequency of said power receiving unit.

10. The power receiving device according to claim 1, wherein said power receiving unit. and said power transmitting unit have a coupling coefficient equal to or smaller than 0.1.

11. The power receiving device according to claim 1, wherein said power receiving unit receives electric power from said power transmitting unit through at least one of a magnetic field formed between said power receiving unit and said power transmitting unit and oscillating at a particular frequency and an electric field formed between said power receiving unit and said power transmitting unit and oscillating at a particular frequency.

12. A power transmitting device comprising:

a power transmitting unit transmitting electric power to an external power receiving unit contactlessly;

a second coil provided in said power transmitting unit;

a second shielding wall surrounding said second coil and defining a region in which an electromagnetic field formed around said second coil is radiated;

a second device accommodated inside said second shielding wall;

a second shielding casing having said second device accommodated therein, said second shielding casing being also disposed inside said second shielding wall; and

a second wiring connected to said second device and extending from inside said second shielding casing to outside said second shielding casing, and also pulled outside said second shielding wall,

said second shielding casing having an external surface including a second opposite portion closer to said second shielding wall than said second coil,

said second shielding wall having a second region opposite to said second opposite portion, said second region having a second hole,

said second wiring being pulled outside said second shielding wall through said second hole.

13. The power transmitting device according to claim 12, wherein said second shielding casing is disposed to have said second opposite portion in contact with said second shielding wall at a portion having said second region, and said second wiring is pulled out of said second shielding casing at a portion of said second shielding casing in contact with said second region.

14. The power transmitting device according to claim 13, wherein when said second region and said second wiring are observed inside said second shielding wall in a direction in which said second shielding casing and said second region are aligned, a portion of said second wiring located between said second shielding casing and said second hole is located in said second region.

15. The power transmitting device according to claim 12, wherein:

said second shielding casing a second projection introduced into said second hole; and

said second wiring passes through said second projection and is pulled outside said second shielding wall.

16. The power transmitting device according to claim 12, wherein said second hole and said second coil have a distance therebetween larger than that between said second shielding wall and said second coil.

17. The power transmitting device according to claim 12, wherein:

said power transmitting unit includes a second capacitor connected to said second coil; and

said second hole and said second capacitor have a distance therebetween larger than that between said second capacitor and said second shielding wall.

18. The power transmitting device according to claim 12, further comprising a second electromagnetic induction coil passing electric power to said second coil through electromagnetic induction, wherein said second device is an impedance adjuster body connected to said second electromagnetic induction coil.

19. The power transmitting device according to claim 12, wherein:

said second shielding wall includes a bottom wall, and a surrounding side wall rising upward from said bottom wall; and

said second hole is formed through said bottom wall.

20. The power transmitting device according to claim 12, wherein said power transmitting unit and said power receiving unit have natural frequencies, respectively, with a difference equal to or smaller than 10% of the natural frequency of said power receiving unit.

21. The power transmitting device according to claim 12, wherein said power receiving unit and said power transmitting unit have a coupling coefficient equal to or smaller than 0.1.

22. The power transmitting device according to claim 12, wherein said power transmitting unit transmits electric power to said power receiving unit through at least one of a magnetic field formed between said power transmitting unit and said power receiving unit and oscillating at a particular frequency and an electric field formed between said power transmitting unit and said power receiving unit and oscillating at a particular frequency.

23. A power transfer system comprising a power receiving device and a power transmitting device including a power transmitting unit, said power receiving device having:

a power receiving unit receiving electric power from said power transmitting unit contactlessly;

a first coil provided in said power receiving unit;

a first shielding wall surrounding said first coil and defining a region in which an electromagnetic field formed around said first coil is radiated;

a first device accommodated inside said first shielding wall;

a first shielding casing having said first device accommodated therein, said first shielding casing being also disposed inside said first shielding wall; and

a first wiring connected to said first device and extending from inside said first shielding casing to outside said first shielding casing, and also pulled outside said first shielding wall,

said first shielding casing having an external surface including a first opposite portion closer to said first shielding wall than said first coil,

said first shielding wall having a first region opposite to said first opposite portion, said first region having a first hole,

said first wiring being pulled outside said first shielding wall through said first hole.

24. A power transfer system comprising a power transmitting device and a power receiving device including a power receiving unit, said power transmitting device having:

a power transmitting unit transmitting electric power to said power receiving unit contactlessly;

a second coil provided in said power transmitting unit;

a second shielding wall surrounding said second coil and defining a region in which an electromagnetic field formed around said second coil is radiated;

a second device accommodated inside said second shielding wall;

a second shielding casing having said second device accommodated therein, said second shielding casing being also disposed inside said second shielding wall; and

a second wiring connected to said second device and extending from inside said second shielding casing to outside said second shielding casing, and also pulled outside said second shielding wall,

said second shielding casing having an external surface including a second opposite portion closer to said second shielding wall than said second coil,

said second shielding wall having a second region opposite to said second opposite portion, said second region having a second hole,

said second wiring being pulled outside said second shielding wall through said second hole.