COIL STRUCTURE FOR WIRELESS POWER TRANSMISSIONS AND WIRELESS POWER TRANSMITTER INCLUDING THE SAME

• US 20160365190A1
• Filed: 02/22/2016
• Published: 12/15/2016
• Est. Priority Date: 06/09/2015
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: JEONG, In Wha, PARK, Jong Heum, KIM, Hugh
• Granted Patent: US 10,135,296 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A coil structure for wireless power transmissions includes: a body having a cylindrical shape; an upper transmission coil formed on the body and configured to generate an electromagnetic field passing through an upper surface of the body; and at least one side transmission coil formed on the body and configured to generate an electromagnetic field passing through a side surface of the body.

Claims

1. A coil structure for wireless power transmissions comprising:

a body having a cylindrical shape;

an upper transmission coil formed on the body and configured to generate an electromagnetic field passing through an upper surface of the body; and

at least one side transmission coil formed on the body and configured to generate an electromagnetic field passing through a side surface of the body.

2. The coil structure for wireless power transmissions of claim 1, wherein:

the upper transmission coil is formed on the upper surface of the body; and

the coil structure further comprises a magnetic shield layer formed in an upper portion of the body below the upper surface of the body, and configured to block the magnetic field generated by the upper transmission coil from propagating toward a lower portion of the body.

3. The coil structure for wireless power transmissions of claim 1, wherein the at least one side transmission coil comprises:

a first side transmission coil disposed around an upper portion of the side surface of the body and configured to generate a first electromagnetic field perpendicular to the side surface of the body; and

a second side transmission coil disposed around a lower portion of the side surface of the body and configured to generate a second electromagnetic field perpendicular to the side surface of the body.

4. The coil structure for wireless power transmissions of claim 3, further comprising an insulator configured to prevent a short circuit between a portion of the at least one side transmission coil formed in a vertical direction and a portion of the at least one side transmission coil formed in a horizontal direction.

5. The coil structure for wireless power transmissions of claim 4, further comprising a groove formed in the side surface of the body, wherein:

the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction cross each other; and

one of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction is inserted into the groove, and a remaining region of the groove is filled with the insulator.

6. The coil structure for wireless power transmissions of claim 1, wherein the at least one side transmission coil comprises a single coil by wound around one of an upper portion and a lower portion of the side surface of the body, extending in a vertical direction of the body, wound around the other one of the upper portion and the lower portion of the side surface of the body, and extending in one of the upper portion and the lower portion of the side surface of the body.

7. The coil structure for wireless power transmissions of claim 6, wherein a region formed by a portion of the at least one side transmission coil extending in a vertical direction from the upper portion of the side surface of the body to the lower portion and a region formed by a portion of the at least one side transmission coil extending in a vertical direction from the lower portion of the side surface of the body to the upper portion partially overlap.

8. The coil structure for wireless power transmissions of claim 6, further comprising an insulator configured to prevent a short circuit between a portion of the at least one side transmission coil formed in a vertical direction and a portion of the at least one side transmission coil formed in a horizontal direction.

9. The coil structure for wireless power transmissions of claim 8, wherein:

the insulator is disposed on top of one of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction; and

the other of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction is disposed on top of the insulator.

10. A wireless power transmitter comprising:

a direct current-alternating current configured to convert a direct current voltage into an alternating current voltage; and

a transmission resonator comprising a wireless power transmission coil structure configured to wirelessly transmit power based on the alternating current voltage converted by the direct current-alternating current converter,

wherein the wireless power transmission coil structure comprises;

a body having a cylindrical shape;

an upper transmission coil configured to generate an electromagnetic field passing through an upper surface of the body; and

at least one side transmission coil configured to generate an electromagnetic field passing through a side surface of the body.

11. The wireless power transmitter of claim 10, wherein:

the upper transmission coil is formed on an upper surface of the body; and

the wireless power transmission coil structure further comprises a magnetic shield layer formed in an upper portion of the body below the upper surface of the body, and configured to block the magnetic field generated by the upper transmission coil from propagating toward a lower portion of the body.

12. The wireless power transmitter of claim 10, wherein the at least one side transmission coil comprises:

a first side transmission disposed around an upper portion of the side surface of the body and configured to generate a first electromagnetic field perpendicular to the side surface of the body; and

a second side transmission coil formed to surround a lower portion of the side surface of the body and configured to generate a second electromagnetic field perpendicular to the side surface of the body.

13. The wireless power transmitter of claim 12, further comprising an insulator configured to prevent a short circuit between a portion of the at least one side transmission coil formed in a vertical direction and a portion of the at least one side transmission coil formed in a horizontal direction.

14. The wireless power transmitter of claim 13, further comprising a groove formed in the side surface of the body, wherein

the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction cross each other;

and

one of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction is inserted into the groove, and a remaining region of the groove is filled with the insulator.

15. The wireless power transmitter of claim 10, wherein the at least one side transmission coil comprises a single coil wound around one of an upper portion and a lower portion of the side surface of the body, extending in a vertical direction of the body, wound around the other one of the upper portion and the lower portion of the side surface of the body, and extending in one of the upper portion and the lower portion of the side surface of the body.

16. The wireless power transmitter of claim 15, wherein a region formed by a portion of the at least one side transmission coil extending in a vertical direction from the upper portion of the side surface of the body to the lower portion and a region formed by a portion of the at least one side transmission coil extending in a vertical direction from the lower portion of the side surface of the body to the upper portion partially overlap.

17. The wireless power transmitter of claim 15, further comprising an insulator configured to prevent a short circuit between a portion of the at least one side transmission coil formed in a vertical direction and a portion of the at least one side transmission coil formed in a horizontal direction.

18. The wireless power transmitter of claim 15, wherein:

the insulator is disposed on top of one of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction; and

the other of the portion of the at least one side transmission coil formed in the vertical direction and the portion of the at least one side transmission coil formed in the horizontal direction is disposed on top of the insulator.