LONG RANGE LOW FREQUENCY RESONATOR AND MATERIALS

• US 20090058189A1
• Filed: 08/11/2008
• Published: 03/05/2009
• Est. Priority Date: 08/13/2007
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Nigel Power LLC (Qualcomm, Inc.)
• Inventors: Widmer, Hanspeter, Sieber, Lukas, Cook, Nigel P.
• Application Number:
  US12/189,720
• Publication Number:
  US 20090058189A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• 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: 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: H04B 5/79 for data transfer in combination with power transfer

Abstract

Transmission of power at low frequencies, e.g. less than 1 MHz. The power can be transmitted in various ways, using different structures included stranded wire such as Litz wire. The inductor can also use cores of ferrites for example. Passive repeaters can also be used.

Claims

1. A wireless power transmitter system, comprising:

a connection to a source of line power;

a modulating part, which modulates said line power to create a first frequency of lower than 1 MHz; and

a transmitter part, including a transmitting antenna formed of a conductive loop with a capacitor that brings said antenna to resonance at said first frequency, and which produces a magnetic field based on said source of line power, said transmitter part having a Q factor at said frequency, where said Q factor is at least 300.

2. A system as in claim 1, wherein said Q factor is at least 1000.

3. A system as in claim 1, wherein said antenna uses stranded wire for said conductive loop formed of multiple strands which each carry current but are each insulated from one another.

4. A system as in claim 1, wherein said antenna uses a core inside said inductive loop.

5. A system as in claim 4, wherein said core is formed of a ferrite material.

6. A system as in claim 5, wherein said conductive loop is formed of a stranded wire material formed of multiple strands which each carry current but are each insulated from one another.

7. A system as in claim 6, wherein said stranded wire material is Lutz wire.

8. A system as in claim 1, further comprising at least one passive loop, tuned to repeat a magnetic field produced by said transmitter.

9. A system as in claim 1, wherein said first frequency is lower than 500 kHz.

10. A system as in claim 1, further comprising a receiver that has an antenna formed of a coil loop and a capacitor which makes a resonant circuit at said first frequency that has magnetic energy induced therein by said transmitter, and which produces output power.

11. A system as in claim 10, wherein said antenna in said receiver uses stranded wire in said coil loop formed of multiple strands which each carry current but are each insulated from one another.

12. A system as in claim 10, wherein said antenna in said receiver uses ferrites as a core for said coil loop.

20. A system as in claim 12, further comprising at least one passive loop, tuned to repeat a magnetic field at said first frequency.

21. A system as in claim 12, wherein said first frequency is lower than 500 kHz.

22. A system as in claim 12, further comprising a transmitter that has an antenna formed of a coil loop and a capacitor which makes a resonant circuit at said first frequency that has magnetic energy produced therein by a source of line power.

23. A system as in claim 22, wherein said antenna in said receiver uses stranded wire in said coil loop.

24. A system as in claim 22, wherein said antenna in said receiver uses ferrites as a core for said coil loop.

13. A wireless power receiver system, comprising:

a receiver part, including a receiving antenna formed of a conductive loop with a capacitor that brings said antenna to resonance at a first frequency, and which receives a magnetic field and produces an output that is based on the magnetic field, said first frequency being lower than 1 Mhz; and

a rectifier, which rectifies said output to produce a power output.

14. A system as in claim 13, wherein a Q factor of said receiver part is at least 300.

15. A system as in claim 13, wherein said antenna uses stranded wire for said conductive loop, formed of multiple strands which each carry current but are each insulated from one another.

16. A system as in claim 13, wherein said antenna uses a core inside said inductive loop.

17. A system as in claim 16, wherein said core is formed of a ferrite material.

18. A system as in claim 17, wherein said conductive loop is formed of a stranded wire material, formed of multiple strands which each carry current but are each insulated from one another.

19. A system as in claim 18, wherein said stranded wire material is Lutz wire.

25. A method of transmitting power, comprising:

using electrical power to create a signal having a first frequency of lower than 1 MHz;

using an antenna which is self resonant at said first frequency to transmit said signal; and

using a passive repeater that is activated by the transmitter to repeat said signal at said first frequency.

26. A method as in claim 25, wherein said antenna includes an inductive loop, and a capacitor that brings the antenna to resonance at said first frequency.

27. A method as in claim 26, wherein said antenna is formed of stranded wire formed of multiple strands which each carry current but are each insulated from one another.

28. A method as in claim 26, wherein said inductive loop includes a core portion formed of ferrite.

29. A method as in claim 25, wherein said repeater is formed of stranded wire.

30. A method as in claim 25, wherein said repeater includes a core formed of ferrite.