TUNABLE WIRELESS ENERGY TRANSFER FOR OUTDOOR LIGHTING APPLICATIONS

• US 20120235567A1
• Filed: 11/07/2011
• Published: 09/20/2012
• Est. Priority Date: 09/27/2008
• Status: Active Grant

• Current Assignee: WiTricity Corporation
• Original Assignee: WiTricity Corporation
• Inventors: Karalis, Aristeidis, Kurs, Andre B., Campanella, Andrew J., Schatz, David A., Kesler, Morris P., Hall, Katherine L., Giler, Eric R., Soljacic, Marin
• Granted Patent: US 8,466,583 B2
• Time in Patent Office: Days
• US Class Current: 315/70
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance

Abstract

A mobile wireless receiver for use with a first electromagnetic resonator coupled to a power supply includes a load associated with an outdoor lighting unit that draws energy from the load to power a light source associated with the outdoor lighting unit, and a second electromagnetic resonator configured to be coupled to the load and moveable relative to the first electromagnetic resonator, wherein the second electromagnetic resonator is configured to be wirelessly coupled to the first electromagnetic resonator to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator, and wherein the second electromagnetic resonator is configured to be tunable during system operation so as to at least one of tune the power provided to the second electromagnetic resonator and tune the power delivered to the load.

Claims

1. A mobile wireless receiver for use with a first electromagnetic resonator coupled to a power supply, first electromagnetic resonator having a mode with a resonant frequency ω

₁, an intrinsic loss rate Γ

₁, and a first Q-factor Q₁=(ω

₁/2Γ

T₁, the mobile wireless receiver comprising;

a load associated with an outdoor lighting unit that draws energy from the load to power a light source associated with the outdoor lighting unit; and

a second electromagnetic resonator configured to be coupled to the load and moveable relative to the first electromagnetic resonator, the second electromagnetic resonator having a mode with a resonant frequency ω

₂, an intrinsic loss rate Γ

₂, and a second Q-factor Q₂=ω

₂/2Γ

₂;

wherein the second electromagnetic resonator is configured to be wirelessly coupled to the first electromagnetic resonator to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator; and

wherein the second electromagnetic resonator is configured to be tunable during system operation so as to at least one of tune the power provided to the second electromagnetic resonator and tune the power delivered to the load.

2. The wireless receiver of claim 1, wherein the lighting unit is an LED lighting unit.

3. The wireless receiver of claim 1, wherein the lighting unit is a fluorescent lighting unit.

4. The wireless receiver of claim 1, wherein the lighting unit is a landscape lighting unit.

5. The wireless receiver of claim 1, wherein the non-radiative wireless power is delivered over a distance greater than the diameter of at least one of the electromagnetic resonators.

6. The wireless receiver of claim 1, wherein the second electromagnetic resonator transfers power originating from the first electromagnetic resonator to a third electromagnetic resonator.

7. A power source for wirelessly providing power to a mobile wireless receiver, the power source comprising:

a power supply; and

a first electromagnetic resonator coupled to the power supply and having a mode with a resonant frequency ω

₁, an intrinsic loss rate Γ

₁, and a first Q-factor Q₁=ω

₁/2Γ

₁,

wherein the first electromagnetic resonator is configured to be wirelessly coupled to a second electromagnetic resonator to provide non-radiative wireless power to the second electromagnetic resonator, the second electromagnetic resonator having a mode with a resonant frequency ω

₂, an intrinsic loss rate Γ

₂, and a second Q-factor Q₂=ω

₂/2Γ

₂ and being coupled to a load associated with an outdoor lighting unit that draws energy from the load to power a light source associated with the outdoor lighting unit;

wherein the first electromagnetic resonator is configured to be tunable during system operation so as to tune the power delivered to the second electromagnetic resonator for use by the load.

8. The power source of claim 7, wherein the lighting unit is an LED lighting unit.

9. The power source of claim 7, wherein the lighting unit is a fluorescent lighting unit.

10. The power source of claim 7, wherein the lighting unit is a landscape lighting unit.

11. The power source of claim 7, wherein the non-radiative wireless power is delivered over a distance greater than the diameter of at least one of the electromagnetic resonators.

12. The power source of claim 7, wherein the second electromagnetic resonator transfers power originating from the first electromagnetic resonator to a third electromagnetic resonator.

13. A mobile wireless power system, comprising:

a first electromagnetic resonator coupled to a power supply, the first electromagnetic resonator having a mode with a resonant frequency ω

₁, an intrinsic loss rate Γ

₁, and a first Q-factor Q₁=ω

₁/2Γ

₁; and

a second electromagnetic resonator coupled to a load that is associated with an outdoor lighting unit that draws energy from the load to power a light source associated with the outdoor lighting unit, the second electromagnetic resonator having a mode with a resonant frequency ω

₂, an intrinsic loss rate Γ

₂, and a second Q-factor Q₂=ω

₂/2Γ

₂;

wherein at least one of the first electromagnetic resonator and the second electromagnetic resonator is configured to be tunable during system operation so as to at least one of tune the power provided to the second electromagnetic resonator and tune the power delivered to the load.

14. The power system of claim 13, wherein the lighting unit is an LED lighting unit.

15. The power system of claim 13, wherein the lighting unit is a fluorescent lighting unit.

16. The power system of claim 13, wherein the lighting unit is a landscape lighting unit.

17. The power system of claim 13, wherein the non-radiative wireless power is delivered over a distance greater than the diameter of at least one of the electromagnetic resonators.

18. The power system of claim 13, wherein the second electromagnetic resonator transfers power originating from the first electromagnetic resonator to a third electromagnetic resonator.