WIRELESS POWER TRANSMISSION APPARATUS USING NEAR FIELD FOCUSING

• US 20110156492A1
• Filed: 12/25/2010
• Published: 06/30/2011
• Est. Priority Date: 12/30/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Nam Yun, Park, Eun Seok, Ryu, Young Ho, Kwon, Sang Wook, Hong, Young Tack
• Granted Patent: US 9,013,068 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A wireless power transmission apparatus using near field focusing is provided. The wireless power transmission apparatus may include a source unit including a source resonator that transmits power wirelessly to a target apparatus, and a near field focusing unit to focus a near field of a magnetic field radiated in an omni-direction from the source resonator onto the target apparatus.

Claims

1. A wireless power transmission apparatus, comprising:

a source unit comprising a source resonator to transmit wireless power to a target apparatus; and

a near field focusing unit to focus a near field of a magnetic field onto the target apparatus, wherein the magnetic field is radiated in an omni-direction from the source resonator.

2. The wireless power transmission apparatus of claim 1, wherein the near field focusing unit comprises a meta-superstrate that has a negative refractive index.

3. The wireless power transmission apparatus of claim 1, wherein the near field focusing unit comprises a Mu Near Zero (MNZ) superstrate or Epsilon Near Zero (ENZ) superstrate that has a beam forming characteristic.

4. The wireless power transmission apparatus of claim 1, further comprising:

a near field controller that has a High Impedance Surface (HIS) characteristic.

5. The wireless power transmission apparatus of claim 4, wherein the near field controller is designed such that a magnetic field of the source unit has an in-phase characteristic.

6. The wireless power transmission apparatus of claim 4, wherein the near field controller comprises:

a side focusing unit to control a direction of a side magnetic field of the source unit; and

a rear surface focusing unit to control a direction of a rear surface magnetic field of the source unit.

7. A source resonator for increasing wireless energy transmission efficiency, the source resonator comprising:

a resonator for wirelessly transmitting a power signal to a target resonator; and

a near field focusing unit that focuses a near field of a magnetic field in a direction of the target resonator such that incident waves of the power signal that are not traveling in the direction of the target resonator are redirected towards the target resonator.

8. The source resonator of claim 7, wherein the near field focusing unit comprises a meta-superstrate that has a negative refractive index that enables the incident waves to be redirected towards the target resonator.

9. The source resonator of claim 7, wherein the near field focusing unit comprises a Mu Near Zero (MNZ) superstrate or Epsilon Near Zero (ENZ) superstrate that has a beam forming characteristic that enables the incident waves to be redirected towards the target resonator.

10. The source resonator of claim 7, further comprising a near field controller that is designed such that the magnetic field of the source unit has an in-phase characteristic.

11. The source resonator of claim 10, wherein the near field controller comprises a side focusing unit to control a direction of a side magnetic field of the source unit, and a rear surface focusing unit to control a direction of a rear surface magnetic field of the source unit.