Wireless Power Transmitter

• US 20160261142A1
• Filed: 03/04/2016
• Published: 09/08/2016
• Est. Priority Date: 03/06/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Jae-Hyun, KIM, Chang-Yeong, RYU, Young-Ho, KWAK, Kyu-Sub, KIM, Dong-Zo
• Granted Patent: US 10,819,160 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas

Abstract

A wireless power transmitter for wirelessly transmitting power to a wireless power receiver is provided. A wireless power transmitter according to various embodiments may include: a driving unit that provides power; and a power transmission unit that wirelessly transmits power to the wireless power receiver based on the power received from the driving unit, wherein the power transmission unit may include at least one capacitor; a first coil connected to the at least one capacitor, and a second coil connected to the at least one capacitor and disposed parallel to the first coil.

Claims

1. A wireless power transmitter that wirelessly transmits power to a wireless power receiver, the wireless power transmitter comprising:

a driving unit that provides power; and

a power transmission unit that wirelessly transmits power to the wireless power receiver based on the power received from the driving unit, and

wherein the power transmission unit comprises a capacitor, a first coil connected to the capacitor, and a second coil connected to the capacitor and disposed in parallel with the first coil.

2. The wireless power transmitter of claim 1, wherein, a first current is applied to the first coil in a first direction from the driving unit, and a second current is applied to the second coil in a second direction from the driving unit.

3. The wireless power transmitter of claim 2, wherein the first coil generates a first magnetic field based on the first current, and the second coil generates a second magnetic field based on the second current.

4. The wireless power transmitter of claim 3, a radial magnetic field is formed between the first coil and the second coil based on the first magnetic field and the second magnetic field.

5. The wireless power transmitter of claim 2, wherein the first direction and the second direction are opposite to each other, and the first coil, the second coil, and the capacitor have a resonance frequency of an odd mode.

6. The wireless power transmitter of claim 5, further comprising a resistor,

wherein, at least a part among the first coil and the capacitor has a first resonance frequency, at least a part among the second coil and the capacitor has a second resonance frequency, and the resonance frequency of the odd mode is determined by:

7. The wireless power transmitter of claim 6, wherein L₁, L₂, and M have values when the resonance frequency of the odd mode is a frequency defined by an induction scheme or a frequency defined by a resonance scheme.

8. The wireless power transmitter of claim 1, wherein the first coil and the second coil are connected in series or in parallel.

9. The wireless power transmitter of claim 1, wherein the first coil and the second coil are not connected by wire.

10. The wireless power transmitter of claim 9, wherein the second coil generates an induced magnetic field and an induced electromotive force based on the induced magnetic field generated by the first coil after receiving power from the driving unit.

11. The wireless power transmitter of claim 1, wherein the first coil and a first capacitor of the capacitor form a resonance circuit, and the second coil and a second capacitor of the capacitor form a resonance circuit.

12. The wireless power transmitter of claim 1, wherein the first coil and the capacitor form a resonance circuit, and the second coil and the capacitor form a resonance circuit.

13. The wireless power transmitter of claim 1, further comprising a shielding member disposed inside the first coil and the second coil.

14. The wireless power transmitter of claim 1, at least one of a size of the first coil and the second coil and a distance between the first coil and the second coil is determined corresponding to the size of a coil of the wireless power receiver.

15. The wireless power transmitter of claim 14, further comprising:

a communication unit that receives category information of the wireless power receiver from the wireless power receiver; and

a motor that adjusts a distance between the first coil and the second coil corresponding to the size of the coil of the wireless power receiver obtained from the category information.

16. A wireless power transmitter that wirelessly transmits power to a wireless power receiver, the wireless power transmitter comprising:

a driving unit that provides power; and

a power transmission unit that wirelessly transmits power to the wireless power receiver based on the power received from the driving unit, and

wherein the power transmission unit comprises a capacitor, and a coil that is connected to the capacitor and includes a first sub-coil, a second sub-coil that is parallel to the first sub-coil, and a connecting conductive wire that connects the first sub-coil to the second sub-coil.

17. The wireless power transmitter of claim 16, wherein the driving unit applies a current to the coil, the coil connects the first sub-coil and the second sub-coil such that a current is applied to the first sub-coil in a first direction and a current is applied to the second sub-coil in a second direction opposite to the first direction.

18. The wireless power transmitter of claim 17, wherein the first sub-coil generates a first magnetic field based on the current flowing in the first direction, and the second sub-coil generates a second magnetic field based on the current flowing in the second direction.

19. The wireless power transmitter of claim 18, a radial magnetic field is formed between the first sub-coil and the second sub-coil based on the first magnetic field and the second magnetic field.

20. The wireless power transmitter of claim 19, wherein the first sub-coil, the second sub-coil, and the capacitor have a resonance frequency of an odd mode.