Transmitting device, receiving device, and power transmission system

• US 10,141,783 B2
• Filed: 05/27/2015
• Issued: 11/27/2018
• Est. Priority Date: 07/07/2014
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ogawa, Kenichirou, Oodachi, Noriaki, Obayashi, Shuichi, Shoki, Hiroki
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Stables, David M
• Application Number:
  US14/722,273
• Publication Number:
  US 20160006259A1
• Time in Patent Office: 1,280 Days
• Field of Search: None
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A power transmission system according to an embodiment includes a transmitting device and a receiving device. The transmitting (receiving) device includes a transmitting (receiving) housing and a transmitting (receiving) coil. The transmitting (receiving) housing includes a first transmitting (receiving) surface and a second transmitting (receiving) surface. The transmitting (receiving) coil includes a first transmitting (receiving) part and a second transmitting (receiving) part. A first facing area and a second facing area at the reference position are set such that change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the first transmitting surface becomes smaller than change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the second transmitting surface.

Claims

1. A power transmission system comprising:

a transmitting device including

a transmitting housing including a first transmitting surface and a second transmitting surface inclined with respect to the first transmitting surface, and

a transmitting coil including a first transmitting part arranged in the transmitting housing at a side of the first transmitting surface and a second transmitting part arranged in the transmitting housing at a side of the second transmitting surface; and

a receiving device including

a receiving housing including a first receiving surface and a second receiving surface inclined with respect to the first receiving surface, and

a receiving coil including a first receiving part arranged in the receiving housing at a side of the first receiving surface and a second receiving part arranged in the receiving housing at a side of the second receiving surface,

wherein a reference position of the receiving coil with respect to the transmitting coil at a time of power transmission is set such that the first receiving part and the first transmitting part face each other, and the second receiving part and the second transmitting part face each other,

a first facing area between the first receiving part and the first transmitting part at the reference position, and a second facing area between the second receiving part and the second transmitting part at the reference position are set such that change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the first transmitting surface becomes smaller than change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the second transmitting surface, and

when the receiving device moves from the reference position to a maximum position gap distance in a direction perpendicular to the first transmitting surface, strength of magnetic coupling between the second transmitting part and the second receiving part becomes larger and strength of magnetic coupling between the first transmitting part and the first receiving part becomes smaller.

2. The system according to claim 1, wherein the reference position is set such that the first transmitting surface and the first receiving surface are in contact with each other, and the second transmitting surface and the second receiving surface are in contact with each other.

3. The system according to claim 1, wherein at least one of the receiving coil and the transmitting coil is formed of electrically connected two plane coils.

4. The system according to claim 1, wherein at least one of the receiving coil and the transmitting coil is formed of one flat plane coil, one bent plane coil, or one curved plane coil.

5. The system according to claim 1, wherein the first facing area is an area of a projection of the first receiving part formed on the first transmitting part at the reference position.

6. The system according to claim 1, wherein the second facing area is an area of a projection of the second receiving part formed on the second transmitting part at the reference position.

7. The system according to claim 1, wherein the strength of magnetic coupling is a mutual inductance or a coupling coefficient between the receiving coil and the transmitting coil.

8. A receiving device comprising:

a receiving housing including a first receiving surface and a second receiving surface inclined with respect to the first receiving surface; and

a receiving coil including a first receiving part arranged in the receiving housing at a side of the first receiving surface and a second receiving part arranged in the receiving housing at a side of the second receiving surface,

wherein the receiving device performs power transmission with a transmitting device including a transmitting housing including a first transmitting surface and a second transmitting surface inclined with respect to the first transmitting surface, and a transmitting coil including a first transmitting part arranged in the transmitting housing at a side of the first transmitting surface and a second transmitting part arranged in the transmitting housing at a side of the second transmitting surface; and

wherein a reference position of the receiving coil with respect to the transmitting coil at a time of power transmission is set such that the first receiving part and the first transmitting part face each other, and the second receiving part and the second transmitting part face each other,

a first facing area between the first receiving part and the first transmitting part at the reference position, and a second facing area between the second receiving part and the second transmitting part at the reference position are set such that change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the first transmitting surface becomes smaller than change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the second transmitting surface, and

when the receiving device moves from the reference position to a maximum position gap distance in a direction perpendicular to the first transmitting surface, strength of magnetic coupling between the second transmitting part and the second receiving part becomes larger and strength of magnetic coupling between the first transmitting part and the first receiving part becomes smaller.

9. The device according to claim 8, wherein the receiving coil is formed of electrically connected two plane coils.

10. The device according to claim 8, wherein the receiving coil is formed of one flat plane coil, one bent plane coil, or one curved plane coil.

11. A transmitting device comprising:

a transmitting housing including a first transmitting surface and a second transmitting surface inclined with respect to the first transmitting surface; and

a transmitting coil including a first transmitting part arranged in the transmitting housing at a side of the first transmitting surface and a second transmitting part arranged in the transmitting housing at a side of the second transmitting surface,

wherein the transmitting device performs power transmission with a receiving device including a receiving housing including a first receiving surface and a second receiving surface inclined with respect to the first receiving surface, and a receiving coil including a first receiving part arranged in the receiving housing at a side of the first receiving surface and a second receiving part arranged in the receiving housing at a side of the second receiving surface,

wherein a reference position of the receiving coil with respect to the transmitting coil at a time of power transmission is set such that the first receiving part and the first transmitting part face each other, and the second receiving part and the second transmitting part face each other,

a first facing area between the first receiving part and the first transmitting part at the reference position, and a second facing area between the second receiving part and the second transmitting part at the reference position are set such that change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the first transmitting surface becomes smaller than change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the second transmitting surface, and

when the receiving device moves from the reference position to a maximum position gap distance in a direction perpendicular to the first transmitting surface, strength of magnetic coupling between the second transmitting part and the second receiving part becomes larger and strength of magnetic coupling between the first transmitting part and the first receiving part becomes smaller.

12. The device according to claim 11, wherein the transmitting coil is formed of electrically connected two plane coils.

13. The device according to claim 11, wherein the transmitting coil is formed of one flat plane coil, one bent plane coil, or one curved plane coil.