Wireless power transmission systems and methods

• US 20070021140A1
• Filed: 07/22/2005
• Published: 01/25/2007
• Est. Priority Date: 07/22/2005
• Status: Abandoned Application

• Current Assignee: Emerson Process Management Power & Water Solutions Incorporated (Emerson Electric Company)
• Original Assignee: Emerson Process Management Power & Water Solutions Incorporated (Emerson Electric Company)
• Inventors: Yeager, Robert, Keyes, Marion
• Application Number:
  US11/187,165
• Publication Number:
  US 20070021140A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• 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: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/56 Detection of errors of TPC bits

Abstract

Methods, apparatus, and articles of manufacture to power a device using wirelessly transmitted power are disclosed. Initially, a wireless base unit obtains a request for wireless power. The wireless base unit then determines a power requirement associated with a wireless field unit and compares the power requirement to a remaining power capacity of the wireless base unit. The wireless base unit then transmits power wirelessly to the wireless field unit based on the comparison of the power requirement to the remaining power capacity. The wirelessly transmitted power is associated with powering a field device operatively coupled to the wireless field unit.

Claims

1. A method of powering a device using wirelessly transmitted power, comprising:

obtaining via a wireless base unit a request for wireless power;

determining a power requirement associated with a wireless field unit;

comparing the power requirement to a remaining power capacity of the wireless base unit; and

transmitting power wirelessly via the wireless base unit to the wireless field unit based on the comparison of the power requirement to the remaining power capacity, wherein the wirelessly transmitted power is associated with powering a field device operatively coupled to the wireless field unit.

2. The method as defined in claim 1, wherein the remaining power capacity is associated with at least one of a safe radio frequency power level or a power capacity limitation associated with a power source.

3. The method as defined in claim 1, wherein wirelessly transmitting power via the wireless base unit comprises wirelessly transmitting power using at least one of a frequency hopping technique or a spread spectrum technique.

4. The method as defined in claim 1 further comprising exchanging process control data between the wireless base unit and the wireless field unit.

5. The method as defined in claim 4, wherein exchanging process control data comprises encrypting or decrypting the process control data.

6. An apparatus for powering a device using wirelessly transmitted power, comprising:

a processor system; and

a memory communicatively coupled to the processor system, the memory including stored instructions that enable the processor system to;

obtain a request for wireless power;

determine a power requirement associated with a wireless field unit;

compare the power requirement to a remaining power capacity of a wireless base unit; and

transmit power wirelessly to the wireless field unit based on the comparison of the power requirement to the remaining power capacity, wherein the wirelessly transmitted power is associated with powering a field device operatively coupled to the wireless field unit.

7. The apparatus as defined in claim 6, wherein the remaining power capacity is associated with at least one of a safe radio frequency power level or a power capacity limitation associated with a power source.

8. The apparatus as defined in claim 6, wherein the instructions enable the processor system to transmit power wirelessly using at least one of a frequency hopping technique or a spread spectrum technique.

9. The apparatus as defined in claim 6, wherein the instructions enable the processor system to exchange process control data between a wireless base unit and the wireless field unit.

10. The apparatus as defined in claim 9, wherein the instructions enable the processor system to encrypt or decrypt the process control data.

11. A machine accessible medium having instructions stored thereon that, when executed, cause a machine to:

obtain a request for wireless power;

determine a power requirement associated with a wireless field unit;

compare the power requirement to a remaining power capacity of a wireless base unit; and

transmit power wirelessly to the wireless field unit based on the comparison of the power requirement to the remaining power capacity, wherein the wirelessly transmitted power is associated with powering a field device operatively coupled to the wireless field unit.

12. The machine accessible medium as defined in claim 11, wherein the remaining power capacity is associated with at least one of a safe radio frequency power level or a power capacity limitation associated with a power source.

13. The machine accessible medium as defined in claim 11 having instructions stored thereon that, when executed, cause the machine to transmit power wirelessly using at least one of a frequency hopping technique or a spread spectrum technique.

14. The machine accessible medium as defined in claim 11 having instructions stored thereon that, when executed, cause the machine to exchange process control data between a wireless base unit and the wireless field unit.

15. The machine accessible medium as defined in claim 14 having instructions stored thereon that, when executed, cause the machine to encrypt or decrypt the process control data.

16. A method of receiving wirelessly transmitted power, comprising:

receiving a low-power transmission via a wireless field unit;

powering a communications circuit of the wireless field unit using the low-power transmission;

communicating via the wireless field unit a power request message;

receiving wirelessly transmitted power associated with the power request message; and

powering a field device using the wirelessly transmitted power.

17. The method as defined in claim 16, wherein the low-power transmission is obtained via a fixed frequency signal.

18. The method as defined in claim 16, wherein the communications circuit is configured to at least one of transmit data, receive data, or receive wirelessly transmitted power.

19. The method as defined in claim 16 further comprising determining whether an increased power level is required based on the field device.

20. The method as defined in claim 16 further comprising decrypting the wirelessly transmitted power.

21. The method as defined in claim 16, wherein communicating the power request message comprises encrypting the power request message.

22. The method as defined in claim 16 further comprising determining a power requirement of the field device prior to communicating the power request message.

23. The method as defined in claim 16, wherein the wirelessly transmitted power is transmitted using a spread spectrum technique.

24. The method as defined in claim 16, wherein receiving the wirelessly transmitted power associated with the power request message comprises receiving the wirelessly transmitted power via a signal having a first frequency.

25. The method as defined in claim 24 further comprising:

receiving the wirelessly transmitted power via a signal having a second frequency; and

powering the field device using the wirelessly transmitted power received via the signal having the second frequency.

26. An apparatus for receiving wirelessly transmitted power, comprising:

a processor system; and

a memory communicatively coupled to the processor system, the memory including stored instructions that enable the processor system to;

obtain a low-power transmission;

power a communications circuit using the low-power transmission;

transmit a power request message;

receive wirelessly transmitted power associated with the power request message; and

power a field device using the wirelessly transmitted power.

27. The apparatus as defined in claim 26, wherein the instructions enable the processor system to obtain the low-power transmission via a fixed frequency signal.

28. The apparatus as defined in claim 26, wherein the instructions enable the processor system to at least one of transmit data, receive data, or receive wirelessly transmitted power via the communications circuit.

29. The apparatus as defined in claim 26 wherein the instructions enable the processor system to determine whether an increased power level is required based on the field device.

30. The apparatus as defined in claim 26 wherein the instructions enable the processor system to decrypt the wirelessly transmitted power.

31. The apparatus as defined in claim 26, wherein the instructions enable the processor system to encrypt the power request message.

32. The apparatus as defined in claim 26 wherein the instructions enable the processor system to determine a power requirement of the field device prior to communicating the power request message.

33. The apparatus as defined in claim 26, wherein the instructions enable the processor system to transmit the wirelessly transmitted power using a spread spectrum technique.

34. The apparatus as defined in claim 26, wherein the instructions enable the processor system to receive the wirelessly transmitted power via a signal having a first frequency.

35. The apparatus as defined in claim 34 wherein the instructions enable the processor system to:

receive the wirelessly transmitted power via a signal having a second frequency; and

power the field device using the wirelessly transmitted power received via the signal having the second frequency.

36. A machine accessible medium having instructions stored thereon that, when executed, cause a machine to:

obtain a low-power transmission;

power a communications circuit using the low-power transmission;

transmit a power request message;

receive wirelessly transmitted power associated with the power request message; and

power a field device using the wirelessly transmitted power.

37. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to obtain the low-power transmission via a fixed frequency signal.

38. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to at least one of transmit data, receive data, or receive wirelessly transmitted power via the communications circuit.

39. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to determine whether an increased power level is required based on the field device.

40. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to decrypt the wirelessly transmitted power.

41. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to encrypt the power request message.

42. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to determine a power requirement of the field device prior to communicating the power request message.

43. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to transmit the wirelessly transmitted power using a spread spectrum technique.

44. The machine accessible medium as defined in claim 36 having instructions stored thereon that, when executed, cause the machine to receive the wirelessly transmitted power via a signal having a first frequency.

45. The machine accessible medium as defined in claim 44 having instructions stored thereon that, when executed, cause the machine to:

receive the wirelessly transmitted power via a signal having a second frequency; and

power the field device using the wirelessly transmitted power received via the signal having the second frequency.

46. A method of managing wireless power transmission, comprising:

wirelessly transmitting power via a first wireless base unit to a wireless field unit based on a first power requirement and powering a field device associated with the wireless field unit using the wirelessly transmitted power;

obtaining a request from the wireless field unit to increase the wirelessly transmitted power to a second power requirement;

comparing the second power requirement to a remaining power capacity associated with the first wireless base unit; and

wirelessly transmitting power to the wireless field unit based on the second power requirement and the comparison of the second power requirement to the remaining power capacity.

47. The method as defined in claim 46, wherein wirelessly transmitting power to the device based on the second power requirement comprises wirelessly transmitting power via at least one of the first wireless base unit and a second wireless base unit.

48. The method as defined in claim 46 further comprising encrypting the wirelessly transmitted power.

49. The method as defined in claim 46 further comprising decrypting the request from the wireless field unit.

50. The method as defined in claim 46 further comprising wirelessly transmitting power via the first wireless base unit using at least one of a frequency hopping technique or a spread spectrum technique.

51. The method as defined in claim 46, wherein wirelessly transmitting power to the wireless field unit based on the second power requirement and the comparison of the second power requirement to the remaining power capacity comprises reallocating power loads associated with at least another wireless field unit between the first wireless base unit and at least another wireless base unit.

52. The method as defined in claim 46, wherein the remaining power capacity is associated with at least one of a safe radio frequency power level and a power capacity limitation associated with a power source.

53. A system for transmitting power wirelessly, comprising:

at least one wireless field unit communicatively coupled to a field device;

at least one wireless base unit communicatively coupled to the wireless field unit and configured to wirelessly transmit power to the wireless field unit, wherein the wireless field unit is configured to receive the wirelessly transmitted power and power the field device using the wirelessly transmitted power, and wherein the wireless base unit is configured to exchange process control data with the wireless field unit.

54. The system as defined in claim 53, wherein the wireless field unit is configured to exchange process control data with a portable computing device.

55. The system as defined in claim 53, wherein the wireless field unit is configured to decrypt at least one of the wirelessly transmitted power or the process control data received from the wireless base unit.

56. The system as defined in claim 53, wherein the wireless base unit is configured to wirelessly transmit power using a spread spectrum transmission technique or a frequency hopping transmission technique.

57. The system as defined in claim 53, wherein the wireless base unit is configured to handoff the wireless field unit to another wireless base unit.

58. The system as defined in claim 53, wherein the wireless base unit is configured to continuously transmit a low-level power using a fixed frequency signal.