Apparatus for wireless power transfer, apparatus for wireless power reception and coil structure

• US 10,366,828 B2
• Filed: 12/28/2015
• Issued: 07/30/2019
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Korea Electrotechnology Research Institute
• Original Assignee: Korea Electrotechnology Research Institute
• Inventors: Park, Young Jin, Kim, Jin Wook, Kim, Kwan Ho, Kim, Do Hyun, Yang, Jong Ryul
• Primary Examiner(s): Chen, Sibin
• Application Number:
  US14/981,796
• Publication Number:
  US 20160111208A1
• Time in Patent Office: 1,310 Days
• CPC Class Codes: H01F 27/006 with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• 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

Abstract

The present invention relates to a transmitting device for wireless power transmission, which includes: a bowl-shaped transmitting device body; and a transmitting coil unit for wirelessly transmitting power to a receiving device based on power supplied from a power source. The transmitting coil unit may include a multi-loop coil unit wound in the bottom surface of the transmitting device body, and a helical coil unit wound around the side wall of the transmitting device body, the helical coil unit being wound to increase the radius of a coil loop in a direction to the upper part of the transmitting device body, and being extended from the end of the multi-loop coil unit.

Claims

1. A wireless power transmitting device, comprising:

a bowl-shaped transmitting device body; and

a transmitting coil unit for wirelessly transmitting power to a receiving device,

wherein the transmitting coil unit comprises;

a multi-loop coil unit wound flatways in a bottom of the transmitting device body; and

a helical coil unit extending from the maximum radius of the multi-loop coil unit, wound around a side wall of the transmitting device body, and wound to increase a radius of a coil loop in a direction to an upper part,

wherein the whole or a part of the receiving device is located in an interior area defined by the transmitting device body, and receives wireless power from the wireless power transmitting device, and

wherein the wireless power transmitting device generates a magnetic field that is formed in a wider area than the sum of magnetic fields independently generated by the helical coil unit and the multi-loop coil unit.

2. The wireless power transmitting device of claim 1, wherein the helical coil unit is extended from an end of the multi-loop coil unit.

3. The wireless power transmitting device of claim 1, wherein the helical coil unit ranges in gradient from an angle of 5 degrees to an angle of 90 degrees with regard to the bottom of the transmitting device body.

4. The transmitting coil unit of claim 1, the helical coil unit may have any shape corresponding to a surface of the transmitting device body.

5. The wireless power transmitting device of claim 1, wherein the transmitting coil unit performs control for a magnetic field pattern with a shape and the number of turns of the transmitting coil unit, the spacing between wires, or a tilted angle of the helical coil unit based on a strength of receiving magnetic field when an arrangement of a receiving coil unit is parallel with the transmitting coil unit or perpendicular to the transmitting coil unit, according to an environment condition in which a magnetic flux density interlinked with the receiving coil unit of the receiving device becomes maximum or minimum.

6. The wireless power transmitting device of claim 1, further comprising a source coil unit for transmitting power to the transmitting coil unit by being supplied with the power from a power source.

7. The wireless power transmitting device of claim 1, further comprising one or more matching units for controlling impedance matching in the transmitting coil unit depending on a load of the receiving device and mutual inductance between the transmitting coil unit and the receiving device.

8. The wireless power transmitting device of claim 7, wherein the one or more matching units comprise a source coil for transmitting power to a transmitting coil of the transmitting coil unit by being supplied with the power from a power source, and the source coil is separated from the transmitting coil.

9. The wireless power transmitting device of claim 1, wherein an end of at least one of the multi-loop coil unit and the helical coil unit is connected to one or more capacitors in series or in parallel.

10. The wireless power transmitting device of claim 1, wherein at least one of the multi-loop coil unit and the helical coil unit is wound in a form of any one of a circular coil, a polygonal coil, and an elliptical coil.

11. The wireless power transmitting device of claim 1, wherein the transmitting coil unit transmits power simultaneously to multiple receiving devices having different load characteristics.

12. The wireless power transmitting device of claim 1, wherein the transmitting coil unit comprises a source coil for Tx impedance matching and a transmitter resonant coil.

13. A wireless power transmitting device, comprising:

a bowl body;

a multi-loop coil unit wound flatways and generating magnetic field for supplying wireless power, from a bottom surface of the bowl body; and

a helical coil unit extending from the maximum radius of the multi-loop coil unit and supplying wireless power from a side wall of the bowl body,

wherein the wireless power transmitting device generates a magnetic field for supplying wireless power to cover a wider spatial area compared to the sum of magnetic fields independently generated by the multi-loop coil unit and the helical coil unit,

wherein a receiving device is arranged in any direction, and

wherein the whole or a part of the receiving device is located in an interior area defined the bowl body, and receives wireless power from the wireless power transmitting device.

14. The wireless power transmitting device of claim 13, wherein the multi-loop coil unit is arranged in the bottom surface of the bowl body, and

the helical coil unit is wound along the side wall of the bowl body, and wound to increase a radius of a coil loop in a direction to an upper part.

15. A wireless power receiving device, comprising:

a bowl-shaped receiving device body; and

a receiving coil unit for receiving wireless power supplied from a wireless power transmitting device,

wherein the receiving coil unit comprises;

a multi-loop coil unit wound flatways in a bottom surface of the receiving device body; and

a helical coil unit extending from the maximum radius of the multi-loop coil unit, wound around a side wall of the receiving device body, and wound to increase a radius of a coil loop in a direction to an upper part,

wherein the whole or a part of the wireless power transmitting device is located in an interior area defined by the receiving device body, and transmits the wireless power to the wireless power receiving device, and

wherein the wireless power transmitting device generates a magnetic field that is formed in a wider area than the sum of magnetic fields independently generated by the helical coil unit and the multi-loop coil unit.

16. The wireless power receiving device of claim 15, wherein the helical coil unit is extended from an end of the multi-loop coil unit.

17. The wireless power receiving device of claim 15, wherein the receiving coil unit further comprises one or more matching units for controlling impedance matching in the receiving coil unit depending on a load of the receiving device,

wherein the one or more matching units comprise a receiving coil and an impedance matching circuit, the receiving coil receiving the wireless power from a transmitting coil unit of the wireless power transmitting device, the impedance matching circuit forming a parallel resonance circuit of the load of the receiving device.

18. A wireless power transceiver system, comprising:

a wireless power transmitting device; and

a wireless power receiving device,

wherein the wireless power transmitting device comprises;

a bowl-shaped transmitting device body; and

a transmitting coil unit for wirelessly transmitting power to the wireless power receiving device,

wherein the transmitting coil unit comprises;

a multi-loop coil unit wound flatways in a bottom of the transmitting device body; and

a helical coil unit extending from the maximum radius of the multi-loop coil unit, wound around a side wall of the transmitting device body, and wound to increase a radius of a coil loop in a direction to an upper part,

wherein the whole or a part of the wireless power receiving device is located in an interior area defined by the transmitting device body, and receives wireless power from the wireless power transmitting device, and

wherein the wireless power transmitting device generates a magnetic field that is formed in a wider area than the sum of magnetic fields independently generated by the helical coil unit and the multi-loop coil unit.

19. The wireless power transceiver system of claim 18, wherein the wireless power receiving device comprises:

a box-shaped receiving device body; and

a receiving coil unit for receiving power supplied from the wireless power transmitting device,

wherein the receiving coil unit comprises a multi-loop coil unit wound in a bottom of the receiving device body in a rectangular shape.

20. The wireless power transceiver system of claim 18, wherein the wireless power receiving device comprises:

a bowl-shaped receiving device body; and

a receiving coil unit for receiving power supplied from the wireless power transmitting device,

wherein the receiving coil unit comprises;

a first horizontal coil unit that is wound horizontally to be aligned with a first plane of a supporting means, and

a second horizontal coil unit that is wound horizontally to be aligned with a second plane of the supporting means.