Apparatus for wireless power transmission using high Q low frequency near magnetic field resonator

• US 8,653,909 B2
• Filed: 11/17/2009
• Issued: 02/18/2014
• Est. Priority Date: 11/17/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Eun-seok, Kwon, Sang-wook, Shin, Jea-shik, Hong, Young-tack
• Primary Examiner(s): Takaoka, Dean O
• Assistant Examiner(s): Wong, Alan
• Application Number:
  US12/591,357
• Publication Number:
  US 20100123530A1
• Time in Patent Office: 1,554 Days
• Field of Search: 333/204, 333/205, 333/219, 333/172, 455/41.1, 307/104
• US Class Current: 333/219
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H03H 2/001 comprising magnetostatic wave network elements

Abstract

An apparatus for wireless power transmission is disclosed. According to an exemplary aspect, the wireless power transmission apparatus includes a high Q low frequency near magnetic field resonator having characteristics of a metamaterial. Accordingly, manufacturing of a compact power supply capable of wirelessly supplying power to mobile communication terminals or multimedia terminals is possible. By using a zeroth-order resonator with a DNG or ENG structure, a small-sized power supply with a simple configuration may be manufactured.

Claims

1. A wireless power transmission apparatus, comprising:

a high Q magnetic field resonator configured to comprise a shunt inductor on a transmission line to have characteristics of a metamaterial, and configured to comprise one of a via in a substrate and a slot in the substrate as the shunt inductor to increase a quality factor (Q) value of the resonator,

wherein the metamaterial comprises an epsilon-negative (ENG) metamaterial, and

wherein, in the resonator to implement the characteristics of the ENG metamaterial, the Q value is increased by forming the via in the substrate and the shunt inductor is formed by forming the slot, which has a meandering shape, in the substrate to lengthen a path of current flow.

2. The wireless power transmission apparatus of claim 1, wherein the metamaterial comprises a double-negative (DNG) metamaterial.

3. The wireless power transmission apparatus of claim 2, wherein the characteristics of the DNG metamaterial are implemented by the resonator further comprising a series capacitor on the transmission line.

4. The wireless power transmission apparatus of claim 1, wherein the substrate is made of a ferrite material to confine an electric field within the substrate and increase the strength of a magnetic field which extends outside of the substrate.

5. The wireless power transmission apparatus of claim 1, wherein the high Q magnetic field resonator further comprises a high quality factor (Q) resonator, and is configured to calculate the Q value of the high Q resonator to comprise

Q=R/(ω

₀L_L), wherein R is a resistance, ω

₀ is a resonance frequency and L_L is the shunt inductor.

6. A mobile device having a wireless power transmission apparatus, comprising:

a high Q magnetic field resonator configured to comprise a shunt inductor on a transmission line to have characteristics of a metamaterial, and configured to comprise one of a via in a substrate and a slot in the substrate as the shunt inductor to increase a quality factor (Q) value of the resonator.

7. A mobile device of claim 6, wherein the high Q magnetic field resonator has characteristics of a double-negative (DNG) metamaterial or an epsilon-negative (ENG) metamaterial.

8. A mobile device of claim 7, wherein the characteristics of the DNG metamaterial are implemented by the resonator further comprising a series capacitor on the transmission line.

9. A mobile device of claim 7, wherein the characteristics of the ENG metamaterial are implemented by the resonator and the shunt inductor on a transmission line is formed by forming the slot in the substrate to lengthen a path of current flow.

10. A wireless power transmission method comprising:

configuring a resonance circuit to comprise a shunt inductor on a transmission line to implement characteristics of epsilon-negative (ENG) metamaterial;

forming one of a via in a substrate and a slot in the substrate as the shunt inductor to increase a quality factor (Q) value of the resonance circuit; and

forming the shunt inductor by forming a slot, which has a meandering shape, in a substrate to lengthen a path of current flow.

11. The wireless power transmission method of claim 10, further comprising:

configuring the resonance circuit to comprise a high quality factor (Q) resonator; and

calculating the Q value of the high Q resonator to comprise

Q=R/(ω

₀L_L), wherein R is a resistance, ω

₀ is a resonance frequency and L_L is the shunt inductor.

12. The wireless power transmission method of claim 10, wherein as a number of shunt inductors increases, the Q value increases.

13. The wireless power transmission method of claim 10, wherein the resonance circuit further comprises a series inductor and a shunt capacitor.

14. A wireless power transmission method, comprising:

configuring a resonance circuit to comprise a series capacitor and a shunt inductor on a transmission line to implement characteristics of double-negative (DNG) metamaterial; and

forming one of a via in a substrate and a slot, which has a meandering shape, in the substrate as the shunt inductor to increase a quality factor (Q) value of the resonance circuit.

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

configuring the resonance circuit to comprise a high quality factor (Q) resonator; and

calculating the Q value of the high Q resonator to comprise

Q=R/(ω

₀L_L), wherein R is a resistance, ω

₀ is a resonance frequency and L_L is the shunt inductor.

16. The wireless power transmission method of claim 14, wherein as a number of shunt inductors increases, the Q value increases.

17. The wireless power transmission method of claim 14, wherein the resonance circuit further comprises a series inductor and a shunt capacitor.

18. The wireless power transmission method of claim 14, wherein the slot in the substrate lengthens a path of the current flow.