RESONATORS FOR WIRELESS POWER APPLICATIONS

• US 20100264745A1
• Filed: 03/18/2010
• Published: 10/21/2010
• 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:
  US12/726,913
• Publication Number:
  US 20100264745A1
• 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 receiving assembly for a mobile device for receiving power wirelessly from at least one high-Q resonator that includes a receiving high-Q resonator part, tuned to magnetic resonance at a specified frequency, said receiving resonator part including a conductive loop extending around space and material not exceeding the size of the mobile device, and said receiving resonator part including a capacitive structure coupled to said conductive loop; and at least one mobile electronic item, powered by power that is wirelessly received by said receiving high-Q resonator part.

Claims

1. A receiving assembly for a mobile device for receiving power wirelessly from at least one high-Q resonator, comprising:

a receiving high-Q resonator part, tuned to magnetic resonance at a specified frequency, said receiving resonator part including a conductive loop extending around space and material not exceeding the size of the mobile device, and said receiving resonator part including a capacitive structure coupled to said conductive loop; and

at least one mobile electronic item, powered by power that is wirelessly received by said receiving high-Q resonator part.

2. A receiving resonator as in claim 1, wherein said conductive loop includes only a single loop of conductive material.

3. A receiving resonator as in claim 1, wherein said conductive loop includes multiple loops of conductive material which are spiral to one another.

4. A receiving resonator as in claim 1, wherein said capacitive structure includes a fixed capacitor.

5. A receiving resonator as in claim 1, wherein said capacitive structure also includes a variable capacitor.

6. A receiving resonator as in claim 1, wherein said receiving part is tuned to a resonance frequency of 13.56 MHz.

7. A receiving resonator as in claim 1, further comprising an electrical circuit which-outputs a signal received by said receiving, and couples power therefrom to said electronic item.

8. A resonator as in claim 7, further comprising mobile electronics in the same housing and coupled to be powered by said resonator.

9. A receiving assembly as in claim 1, wherein said capacitor is a variable capacitor.

20. A receiving resonator as in claim 1, further comprising materials with low dielectric losses and low loss tangents.

21. A receiving resonator as in claim 1, further comprising materials which change the intrinsic Q of the resonator by less than a factor of 25.

22. A receiving resonator as in claim 1, further comprising extraneous materials with Q_c-e^abs>

10⁵.

23. A receiving resonator in claim 1, wherein the material is formed of a high-Q material.

29. An assembly as in claim 22, further comprising mobile electronics in the same housing and coupled to be powered by said resonator.

33. An assembly as in claim 29, wherein said capacitive portion is in a package that has an outer surface which has first and second flat connection parts.

10. A wireless power transmitting assembly for transmitting power to at least one high-Q resonator, comprising:

a connection that receives a signal of a specified frequency;

a first coupling loop, coupled to receive said signal;

a second, transmitting high-Q resonator, having an inductive loop portion and a capacitive portion, where the inductive portion and the capacitive portion together form an LC constant that is substantially resonant with said specified frequency; and

wherein said capacitive portion is connected between distal ends of the loop portion.

11. An assembly as in claim 10, wherein said capacitive portion is in a package that has an outer surface which has first and second flat connection parts.

12. A high-Q resonator for exchanging power amongst high-Q resonators, comprising:

a main loop forming a resonator inductance, and a capacitor; and

a coupling loop which is electrically disconnected from said main loop, and is smaller than said main loop.

13. A high-Q resonator for exchanging power amongst high-Q resonators, comprising:

a main loop portion formed of a conductive material arranged into a round loop defining an inductance,

a capacitive portion, coupled to said round loop to form an overall LC value;

a tuning portion, which is adjustable to change an inductive tuning of said main loop, by changing its inductance.

14. A resonator as in claim 13, wherein said tuning portion includes a capacitor that can be moved closer to and further from said main loop.

15. A high-Q resonator as in claim 13, wherein said tuning portion includes a non-resonant portion, which can be moved closer to and farther from at least a portion of said main loop.

16. A resonator as in claim 13, wherein said tuning portion includes a part which changes an inductance of only a portion of said main loop, and can be moved closer to and further from said main loop.

17. A resonator as in claim 16, wherein said part is located near a capacitor on said loop.

18. A resonator as in claim 13, wherein said resonator is resonant to a magnetic frequency.

19. A resonator as in claim 18, wherein said resonator includes a power connection.

24. A receiving assembly for a mobile device for receiving power wirelessly from at least one high-Q resonator, comprising:

a receiving high-Q resonator part, tuned to magnetic resonance at a specified frequency, said receiving resonator part including a conductive loop extending in multiple turns, and a capacitor in series with an inductance formed by said multiple turns, said capacitor being located at an edge of the multiple turns; and

at least one connection structure, that connects to said capacitor in series with said multiple turn inductor.

25. An assembly as in claim 24, further comprising at least one mobile electronic item, powered by the power that is wirelessly received by said receiving resonator part and connected to said connection.

26. An assembly as in claim 24, further comprising a second capacitor.

27. An assembly as in claim 26, wherein one of said capacitors is a variable value capacitor.

28. An assembly as in claim 25, further comprising an electrical circuit which outputs a signal received by said receiving, and couples power therefrom to said electronic item.

30. An assembly as in claim 24, wherein said conductive loop comprises a conducting ribbon.

31. A wireless power receiving assembly for receiving power from at least one high-Q resonator, comprising:

a receiving high-Q resonator, having an inductive loop portion and a capacitive portion, where the inductive portion and capacitive portion together form an LC constant that is substantially resonant with a specified frequency; and

wherein said capacitive portion is connected between distal ends of said inductive loop portion.

32. An assembly as claim 31, further comprising a coupling loop, coupled to receive said signal from said receiving high-Q resonator.

35. A high-Q resonator as in claim 32, wherein said band is of conductive material.

36. A high-Q resonator as in claim 32, further comprising a tuning portion, which is adjustable to change an inductive tuning of said main loop, by changing its inductance.

34. A high-Q resonator for exchanging power amongst high-Q resonators, comprising:

a main loop portion formed of a band of conductive material arranged in a round loop defining an inductance; and

a capacitive portion, coupled to said round loop to form an overall LC value.

37. A high-Q resonator as in claim 34, wherein said tuning portion includes a capacitor that can be moved closer to and further from said main loop.

38. A high-Q resonator for exchanging power amongst high-Q resonators, comprising:

a main loop formed of a conductive material arranged into a round loop defining an inductance;

a capacitive portion, coupled to said round loop to form an overall LC value;

a tuning loop, which is adjustable to change an inductive tuning of said main loop, by changing an inductance of said main loop.