Coil, power receiving apparatus, and power transmitting apparatus

• US 10,256,038 B2
• Filed: 02/06/2014
• Issued: 04/09/2019
• Est. Priority Date: 03/06/2013
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ogawa, Kenichirou, Shijo, Tetsu, Yamada, Akiko, Obayashi, Shuichi, Shoki, Hiroki
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Ortiz, Elim
• Application Number:
  US14/174,188
• Publication Number:
  US 20140252867A1
• Time in Patent Office: 1,888 Days
• Field of Search: 336200, 296021
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• 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: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• 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 50/10 using inductive coupling
• 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 5/43 Antennas
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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

Abstract

In one embodiment, a coil includes a magnetic core and a winding. The magnetic core includes at least one block provided with a groove or an opening. Each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux. The coil is used as a power transmitting coil or a power receiving coil.

Claims

1. A coil comprising:

a magnetic core; and

a winding,

wherein

the magnetic core includes a plurality of blocks comprising a magnetic body and an elongate groove or opening, the elongate groove or opening is provided in the magnetic body,

the plurality of blocks are arranged so the elongated groove or the opening of the plurality of blocks extend along a direction of magnetic flux, and

the plurality of blocks are arranged so the magnetic body of each of the plurality of blocks is in contact with the magnetic body of adjacent blocks in the magnetic core.

2. The coil according to claim 1, wherein each block is provided with a plurality of grooves or openings.

3. The coil according to claim 1, wherein the shape of the plurality of blocks is a regular triangle, a square, a regular hexagon, or a regular octagon.

4. The coil according to claim 1, further comprising a conductive plate.

5. The coil according to claim 1, wherein

the winding is wound around the magnetic core,

a shape of each of the plurality of blocks is a rectangle, and

the groove or opening of the plurality of blocks is provided in parallel to one side of the rectangle.

6. The coil of claim 1, wherein the magnetic body of the plurality of blocks comprises ferrite.

7. A coil comprising a magnetic core and a winding, wherein

the magnetic core includes at least one block provided with a groove or an opening,

each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux,

the winding is arranged on one surface of the magnetic core,

the magnetic core includes a first one of the at least one block and a second one of the at least one block forming a rectangular shape,

the groove or the opening of the first block is provided in parallel to one side of the rectangle, and

the groove or the opening of the second block is provided obliquely to one side of the rectangle.

8. The coil according to claim 7, wherein the magnetic core further includes a third block that is not provided with the groove and the opening.

9. The coil according to claim 7, wherein the magnetic core further includes a third block that is provided with the groove or the opening of the rectangle.

10. The coil according to claim 7, wherein the magnetic core has the first block and the second block in which the sizes of the groove or the opening are different.

11. A power receiving apparatus comprising:

a power receiving coil receiving power wirelessly by mutual inductance from a power transmitting apparatus;

a capacitor connected to the power receiving coil;

a rectifier converting AC power received via the capacitor into DC power;

a communication unit communicating a power transmitting status or a power receiving status with the power transmitting apparatus;

a sensor performing at least one of detection of received power, detection of foreign object, and detection of temperature; and

a control unit controlling the received power, based on received information of the communication unit or a detection result of the sensor,

wherein

the power receiving coil includes a magnetic core and a winding,

the magnetic core includes a plurality of blocks comprising a magnetic body and an elongate groove or opening, the elongate groove or opening is provided in the magnetic body,

the plurality of blocks are arranged so the groove or opening of the plurality of blocks extend along a direction of magnetic flux, and

the plurality of blocks are arranged so the magnetic body of each of the plurality of blocks is in contact with the magnetic body of adjacent blocks in the magnetic core.

12. The apparatus according to claim 11, wherein each block is provided with a plurality of grooves or openings.

13. The apparatus according to claim 11, wherein

the winding is wound around the magnetic core,

a shape of each of the plurality of blocks is a rectangle, and

the groove or opening of the plurality of blocks is provided in parallel to one side of the rectangle.

14. A power receiving apparatus comprising:

a power receiving coil receiving power wirelessly by mutual inductance from a power transmitting apparatus;

a capacitor connected to the power receiving coil;

a rectifier converting AC power received via the capacitor into DC power;

a communication unit communicating a power transmitting status or a power receiving status with the power transmitting apparatus;

a sensor performing at least one of detection of received power, detection of foreign object, and detection of temperature; and

a control unit controlling the received power, based on received information of the communication unit or a detection result of the sensor,

wherein

the power receiving coil includes a magnetic core and a winding,

the magnetic core includes at least one block provided with a groove or an opening,

a plurality of the blocks are arranged so as to make the groove or the opening extend along a direction of magnetic flux,

the winding is arranged on one surface of the magnetic core,

the magnetic core includes a first one of the blocks and a second one of the blocks forming a rectangular shape,

the groove or the opening of the first block is provided in parallel to one side of the rectangle, and

the groove or the opening of the second block is provided obliquely to one side of the rectangle.

15. The apparatus according to claim 14, wherein the magnetic core further includes a third block that is not provided with the groove and the opening.

16. The apparatus according to claim 14, wherein the magnetic core further includes a third block that is provided with the groove or the opening of the rectangle.

17. A power transmitting apparatus comprising:

a power supply unit supplying a high-frequency power;

a power transmitting coil wirelessly transmitting the power from the power supply unit to a power receiving apparatus by mutual inductance;

a communication unit communicating a power transmitting status or a power receiving status with the power receiving apparatus;

a sensor performing at least one of detection of transmission power, detection of foreign object, and detection of temperature; and

a control unit controlling the transmission power based on received information of the communication unit or a detection result of the sensor,

wherein

the power transmitting coil includes a magnetic core and a winding,

the magnetic core includes a plurality of blocks comprising a magnetic body and an elongate groove or opening, the elongate groove or opening is provided in the magnetic body,

the plurality of blocks are arranged so the groove or opening of the plurality of blocks extend along a direction of magnetic flux, and

the plurality of blocks are arranged so the magnetic body of each of the plurality of blocks is in contact with the magnetic body of adjacent blocks in the magnetic core.

18. The apparatus according to claim 17, wherein

the winding is wound around the magnetic core,

a shape of each of the plurality of blocks is a rectangle, and

the groove or opening of the plurality of blocks is provided in parallel to one side of the rectangle.

19. A power transmitting apparatus comprising:

a power supply unit supplying a high-frequency power;

a power transmitting coil wirelessly transmitting the power from the power supply unit to a power receiving apparatus by mutual inductance;

a communication unit communicating a power transmitting status or a power receiving status with the power receiving apparatus;

a sensor performing at least one of detection of transmission power, detection of foreign object, and detection of temperature; and

a control unit controlling the transmission power based on received information of the communication unit or a detection result of the sensor,

wherein

the power transmitting coil includes a magnetic core and a winding,

the magnetic core includes at least one block provided with a groove or an opening,

each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux,

the winding is arranged on one surface of the magnetic core,

the magnetic core includes a first one of the at least one block and a second one of the at least one block forming a rectangular shape,

the groove or the opening of the first block is provided in parallel to one side of the rectangle, and

the groove or the opening of the second block is provided obliquely to one side of the rectangle.

20. The apparatus according to claim 19, wherein the magnetic core further includes a third block that is not provided with the groove and the opening.

21. The apparatus according to claim 19, wherein the magnetic core further includes a third block that is provided with the groove or the opening of the rectangle.