BIOLOGICAL EFFECTS OF MAGNETIC POWER TRANSFER

• US 20130278211A1
• Filed: 06/21/2013
• Published: 10/24/2013
• Est. Priority Date: 09/19/2007
• Status: Abandoned Application

• Current Assignee: WiTricity Corporation
• Original Assignee: Qualcomm, Inc.
• Inventors: Cook, Nigel P., Dominiak, Stephen, Widmer, Hanspeter
• Application Number:
  US13/924,324
• Publication Number:
  US 20130278211A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• 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 1/248 provided with an AC/DC converting device, e.g. rectennas
• 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

Abstract

System and method for wireless power transfer based on values set to comply with limits from multiple different agencies.

Claims

1-14. -14. (canceled)

15. An apparatus configured to transmit power via a wireless field, the apparatus comprising:

a frequency generator configured to generate an output signal; and

an antenna circuit coupled to the frequency generator and configured to transmit power via the wireless field based at least in part on the output signal, the antenna circuit located in an area and configured to transmit power at a field strength that is above a safety threshold strength within at least a portion of the area in which a person cannot be located.

16. The apparatus of claim 15, wherein the field strength is a first field strength, and wherein the antenna circuit is further configured to transmit power at a second field strength in at least another portion of the area in which the person can be located, the second field strength being below the safety threshold.

18. The apparatus of claim 15, wherein the safety threshold is based on an amount of emissions with biological effects on the person.

21. The apparatus of claim 15, wherein the antenna circuit is configured to wirelessly transmit power to power or charge a load comprising at least one of a light bulb or an electronic device comprising at least one of an electronic appliance, a computer, a rechargeable battery, a music player, or an automobile.

22. The apparatus of claim 15, wherein the antenna circuit is configured to transmit power such that the person cannot be exposed to the wireless field at the field strength that is above the safety threshold strength within the at least a portion of the area.

23. A method of transmitting power via a wireless field, the method comprising:

generating an output signal; and

wirelessly transmitting power in an area via the wireless field based at least in part on the output signal, wirelessly transmitting power comprising transmitting power at a field strength that is above a safety threshold strength within at least a portion of the area in which a person cannot be located.

24. The method of claim 23, wherein the field strength is a first field strength, and wherein the wirelessly transmitting power further comprises wirelessly transmitting power at a second field strength in at least another portion of the area in which the person can be located, the second field strength being below the safety threshold.

25. The method of claim 23, wherein the first field strength is lower than an interference threshold strength that is based on interference with an external electronic device.

26. The method of claim 23, wherein the safety threshold is based on an amount of emissions with biological effects on the person.

27. The method of claim 23, wherein the wireless field comprises a magnetic field, wherein wirelessly transmitting power comprises wirelessly transmitting power via an antenna circuit configured to resonate at a frequency of the output signal, and wherein wirelessly transmitting power via the antenna circuit comprises inductively transmitting power via the magnetic field.

28. The method of claim 23, wherein wirelessly transmitting power in an area via the wireless field comprises wirelessly transmitting power such that the person cannot be exposed to the wireless field at the field strength that is above the safety threshold strength within the at least a portion of the area.

29. An apparatus configured to transmit power via a wireless field, the apparatus comprising:

means for a generating an output signal; and

means for transmitting power in an area via the wireless field based at least in part on the output signal, the transmitting means comprising means for transmitting power at a field strength that is above a safety threshold strength within at least a portion of the area in which a person cannot be located.

30. The apparatus of claim 29, wherein the field strength is a first field strength, and wherein the means for transmitting power further comprises means for transmitting power at a second field strength in at least another portion of the area in which a person can be located, the second field strength being below the safety threshold.

31. The apparatus of claim 29, wherein the first field strength is lower than an interference threshold strength that is based on interference with an external electronic device.

32. The apparatus of claim 29, wherein the safety threshold is based on an amount of emissions with biological effects on the person.

33. The apparatus of claim 29, wherein the wireless field comprises a magnetic field, wherein the means for transmitting power comprises means for transmitting power via an antenna circuit configured to resonate at a frequency, and wherein the means for transmitting power via the antenna circuit comprises means for inductively transmitting power via the magnetic field.

34. The apparatus of claim 29, wherein the means of transmitting power comprises means for transmitting power such that the person cannot be exposed to the wireless field at the field strength that is above the safety threshold strength within the at least a portion of the area.