Wireless charging system

• US 10,158,242 B2
• Filed: 03/18/2016
• Issued: 12/18/2018
• Est. Priority Date: 03/20/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ha, Dohyuk, Lee, Jung Yub, Kum, Junsig, Lee, Youngju
• Primary Examiner(s): Dinh, Paul
• Application Number:
  US15/074,932
• Publication Number:
  US 20160276864A1
• Time in Patent Office: 1,005 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

Various embodiments of the present disclosure relate to a wireless charging system. The wireless charging system may include: a system body mounted with a power transmission part including a cavity shielded by a conductive material, a power feeding radiator configured to feed power within the cavity to form a resonance mode, and a slot formed at a location with a maximum E-field by the power feeding radiator to form a power transmission route with E-field coupling; and an electronic device including a power reception part mounted on the system body to receive power from the slot through H-field coupling. Various embodiments may be made.

Claims

1. A charging device comprising:

a cavity configured to form a resonance mode, wherein the cavity is shielded by a conductive material;

a power feeding radiator configured to feed power within the cavity;

a slot formed at a location with a maximum electric (E)-field by the power feeding radiator to form a power transmission route through E-field coupling; and

a connection part configured to guide an electronic device to the charging device so that the power is transmitted from the charging device to a power receiver of the electronic device through the slot with magnetic (H)-field coupling.

2. The charging device of claim 1, wherein the electronic device comprises an external metal frame on at least a portion thereof.

3. The charging device of claim 2, wherein the power receiver is disposed on at least a portion of the external metal frame.

4. The charging device of claim 1, wherein the power is fed to a position where E-fields are concentrated within the cavity by using a power feeding radiator.

5. The charging device claim 4, wherein maximum power is formed in the slot by using the power feeding radiator.

6. The charging device of claim 2, wherein the power receiver includes:

a dielectric board disposed on the external metal frame; and

a transmission line formed on the dielectric board.

7. The charging device of claim 6, wherein, when the electronic device is mounted on the charging device, the slot and the power receiver are disposed to face each other and to overlap with each other.

8. The charging device of claim 6, wherein one end of the transmission line is connected to a charging circuit, and a length between another end and the slot is determined to be impedance-matched with the charging circuit.

9. The charging device of claim 2, wherein, when the electronic device is mounted on the charging device, the external metal frame of the electronic device is disposed to be in contact with the conductive material, thereby grounding the external metal frame.

10. The charging device of claim 2, further comprising:

a waveguide disposed on a wall face of the cavity to form the resonance mode within the cavity.

11. The charging device of claim 10, wherein an aperture is provided in a side wall of the cavity, to which the waveguide is connected.

12. The charging device of claim 2, wherein the external metal frame is configured to form a portion of an external appearance of the electronic device.

13. A charging device, comprising:

a cavity configured to form a resonance mode, wherein the cavity is shielded by a conductive material;

a radiator disposed in the cavity;

a slot configured to feed power;

an aperture configured to receive the power, wherein the slot and the aperture are respectively formed at two locations with a maximum electric (E)-field on a side wall of the conductive material and are magnetic (H)-field coupled by feeding power from the radiator to form a power transmission route; and

a connection part configured to guide an electronic device to the charging device so that the power is transmitted from the charging device to a power receiver of the electronic device through the slot with field coupling.

14. The charging device of claim 13, wherein the radiator includes a loop antenna or a patch antenna.

15. A charging device comprising:

a cavity configured to form a resonance mode, wherein the cavity is shielded by a conductive material;

a power feeding radiator configured to feed power to the inside of the cavity;

a slot formed at a location that with a maximum electric (E)-field in the cavity by the power feeding radiator to form a power transmission route through E-field coupling; and

a connection part configured to guide an electronic device to the charging device so that the power is transmitted from the charging device to a power receiver of the electric device through the slot with the E-field coupling.

16. The charging device of claim 15, wherein the power receiver is opened at one side thereof.

17. The charging device of claim 16, wherein a charging circuit is connected to the opened one side.

18. The charging device of claim 15, wherein further comprising:

a waveguide disposed on a metallic material to feed power to the cavity.

19. The charging device of claim 15, further comprising:

an external metal frame configured is to form a portion of an external appearance of the electronic device, and

wherein the power receiver comprises a waveguide portion disposed on at least a portion of the external metal frame.

20. The charging device of claim 19, wherein the waveguide portion is configured to receive power through the E-field coupling, and

an aperture is formed in a portion where E-fields are concentrated.