METHOD AND APPARATUS OF LOAD DETECTION FOR A PLANAR WIRELESS POWER SYSTEM

• US 20110169339A1
• Filed: 03/18/2011
• Published: 07/14/2011
• Est. Priority Date: 07/12/2005
• Status: Abandoned Application

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Karalis, Aristeidis, Soljacic, Marin, Moffatt, Robert, Kurs, Andre B., Joannopoulos, John D., Fisher, Peter H.
• Application Number:
  US13/051,098
• Publication Number:
  US 20110169339A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• 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: H01Q 9/04 Resonant antennas
• CPC Class Codes: H02J 50/12 of the resonant type
• 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: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

Described herein are embodiments of a method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system that includes delivering power to a high-Q resonator, measuring a voltage across a capacitor in said high-Q resonator and determining information regarding power delivered to said high-Q resonator.

Claims

1. A method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system, comprising:

delivering power to a high-Q resonator;

measuring a voltage across a capacitor in said high-Q resonator; and

determining information regarding power delivered to said high-Q resonator.

3. The method according to claim 1, wherein determining information regarding power delivered to the high-Q resonator comprises using said value to control system operation.

5. The method according to claim 1, further comprising:

measuring a power delivered by a power source.

7. The method according to claim 1, wherein the information regarding power delivered by a power source indicates a change in delivered power.

8. The method according to claim 5, wherein information regarding power delivered to the high-Q resonator comprises measuring a current in a coil and a voltage across a capacitor of said resonator.

10. The method according to claim 5, further comprising:

measuring coil current passing through said resonator coil.

11. The method according to claim 5, wherein the information regarding power delivered by a power source indicates a change in delivered power.

2. A method of determining information regarding power delivered to a high-Q resonator for a planar wireless power transfer system, comprising:

delivering power to a high-Q resonator;

measuring a current passing through a coil in said high-Q resonator; and

determining information regarding power delivered to said high-Q resonator.

4. The method according to claim 2, wherein determining information regarding power delivered to the high-Q resonator comprises using said value to control system operation.

6. The method according to claim 2, further comprising:

measuring a power delivered by a power source.

9. The method according to claim 6, wherein information regarding power delivered to the high-Q resonator comprises measuring a current in a coil and a voltage across a capacitor of said resonator.

12. The method according to claim 6, wherein the information regarding power delivered by a power source indicates a change in delivered power.

13. A wireless power apparatus, comprising:

a high-Q resonator comprising a conducting loop and at least one capacitor;

configured for information exchange within the wireless power system.

14. An apparatus as in claim 13 further comprising a monitor for sensing operating parameters.

15. An apparatus as in claim 14 wherein said monitor information is exchanged within the wireless power system.

16. An apparatus as in claim 14 wherein said monitor information is used in a feedback loop.