POSITION INSENSITIVE WIRELESS CHARGING

• US 20120091950A1
• Filed: 10/06/2011
• Published: 04/19/2012
• Est. Priority Date: 09/27/2008
• Status: Active Grant

• Current Assignee: WiTricity Corporation
• Original Assignee: WiTricity Corporation
• Inventors: Campanella, Andrew J., Hall, Katherine L., Karalis, Aristeidis, Kesler, Morris P., Kulikowski, Konrad, Kurs, Andre B., Li, Qiang, Soljacic, Marin, Giler, Eric R., Schatz, David
• Granted Patent: US 8,963,488 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• 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 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance

Abstract

A wireless charging pad includes a capacitively-loaded conducting loop source resonator, with a characteristic size, L1, connected to a switching amplifier and configured to generate an oscillating magnetic field, wherein the conducting loop comprises multiple turns circumscribing an area, the conducting loop does not extend into the center of the circumscribed area, the source resonator delivers useful power to at least one device resonator with a characteristic size, L2, and where L1 is larger than L2.

Claims

1. A wireless charging pad comprising:

a capacitively-loaded conducting loop source resonator, with a characteristic size, L1, connected to a switching amplifier and configured to generate an oscillating magnetic field

wherein the conducting loop comprises multiple turns circumscribing an area,

wherein the conducting loop does not extend into the center of the circumscribed area,

wherein the source resonator delivers useful power to at least one device resonator with a characteristic size, L2, and

wherein, L1 is larger than L2.

2. The pad of claim 1, wherein the capacitively-loaded conducting loop of the source resonator is arranged within an enclosure.

3. The pad of claim 1, wherein the capacitively-loaded conducting loop of the source resonator is arranged within a table top.

4. The pad of claim 1, wherein the source resonator delivers useful power to the at least one device resonator when the at least one device resonator is on the pad.

5. The pad of claim 1, wherein the source resonator delivers useful power to the at least one device resonator when the at least one device resonator is beside the pad.

6. The pad of claim 1, wherein the source resonator delivers useful power to the at least one device resonator when the at least one device resonator is under the pad.

7. The pad of claim 1, wherein the source resonator delivers useful power to the at least one device resonator when the at least one device resonator is above the pad.

8. The pad of claim 1, wherein a computer comprises the at least one device resonator.

9. The pad of claim 1, wherein a phone comprises the at least one device resonator.

10. The pad of claim 1, wherein a controller comprises the at least one device resonator.

11. The pad of claim 1, wherein a camera comprises the at least one device resonator.

12. The pad of claim 1, wherein a light comprises the at least one device resonator.

13. The pad of claim 1, wherein a battery pack comprises the at least one device resonator.

14. The pad of claim 1, further comprising at least one repeater resonator.

15. The pad of claim 1, wherein the pad receives power from another device using a USB cable.

16. The pad of claim 1, wherein the pad receives power from an AC/DC converter.

17. The pad of claim 1, wherein the pad receives power from any of a solar panel, a wind turbine, a water turbine, a fuel cell and a generator.

18. The pad of claim 1, wherein the pad receives power from a battery.