Systems and methods for providing a power optimized waveform

• US 8,987,940 B2
• Filed: 08/17/2009
• Issued: 03/24/2015
• Est. Priority Date: 08/15/2008
• Status: Active Grant

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Trotter, Matthew Shayuan, Durgin, Gregory David
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): BUKHARI, AQEEL H
• Application Number:
  US13/059,019
• Publication Number:
  US 20110148221A1
• Time in Patent Office: 2,045 Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves

Abstract

The present invention describes systems and methods for providing a power optimized waveform. An exemplary embodiment of the present invention provides a method of powering wirelessly powered devices including the step of providing a wirelessly powered device and a wireless power transmission system. Furthermore, the method involves receiving a power waveform to the wirelessly powered device from the wireless power transmission system, wherein each cycle of the power waveform includes a charge portion and a starve portion. Additionally, the maximum voltage of the charge portion is at least double the Root Mean Square (“RMS”) voltage of the starve portion.

Claims

1. A method of powering wirelessly powered devices comprising:

providing a wirelessly powered device and a wireless power transmission system;

constructing, via the wireless power transmission system, a power optimized waveform, wherein the power waveform comprises;

a summation of a plurality of subcarriers having distinct frequency components; and

a plurality of cycles, wherein each cycle of the power optimized waveform includes a charge portion and a starve portion, and further wherein the maximum voltage of the charge portion is at least double the Root Mean Square (“

RMS”

) voltage of the starve portion;

transmitting, from the wireless power transmission system, the power optimized waveform; and

receiving, at the wirelessly powered device, the power optimized waveform.

2. The method of claim 1, wherein a duration of the charge portion is less than 20% of a duration of the starve portion for each cycle of the power waveform.

3. The method of claim 1, wherein the maximum voltage of the charge portion is more than four times the RMS voltage of the starve portion.

4. The method of claim 1, wherein the power waveform is received by a charge pump of the wirelessly powered device.

5. A method of providing a power optimized waveform comprising:

providing a charge portion of a first cycle of the power optimized waveform from a wireless power transmission system; and

providing a starve portion of the first cycle of the power optimized waveform from the wireless power transmission system;

wherein the maximum voltage of the charge portion is at least double the Root Mean Square (“

RMS”

) voltage of the starve portion; and

wherein the power optimized waveform has a derivative that is a continuous waveform.

6. The method of claim 5, wherein a duration of the charge portion is less than 20% of a duration of the starve portion for the first cycle.

7. The method of claim 5, wherein the maximum voltage of the charge portion is more than four times the RMS voltage of the starve portion.

8. The method of claim 5, wherein the power optimized waveform is received by a charge pump of a wirelessly powered device.

9. A method of providing a power optimized waveform comprising:

aggregating a plurality of subcarriers having distinct frequency components;

providing a charge portion of a first cycle of the power optimized waveform from a wireless power transmission system; and

providing a starve portion of the first cycle of the power optimized waveform from the wireless power transmission system;

wherein the maximum voltage of the charge portion is at least double the Root Mean Square (“

RMS”

) voltage of the starve portion, and

wherein the maximum voltage of the starve portion of the power optimized waveform is less than a threshold voltage of a diode of a charge pump of a wirelessly powered device to which the power optimized waveform is provided.

10. A wirelessly powered device comprising:

a charge pump including a voltage doubler, wherein the charge pump is configured to receive a power optimized waveform comprising a summation of a plurality of subcarriers having distinct frequency components; and

wherein each cycle of the power optimized waveform includes a charge portion and a starve portion, and the maximum voltage of the charge portion is at least double the Root Mean Square (“

RMS”

) voltage of the starve portion.

11. The wirelessly powered device of claim 10, wherein the charge pump is configured to receive a continuous wave waveform.

12. The wirelessly powered device of claim 11, wherein a range of the device is at least 10% greater when the charge pump receives the power optimized waveform in comparison to the continuous wave waveform.

13. A wirelessly powered device comprising:

a charge pump including a plurality of diodes; and

the charge pump configured to receive a power optimized waveform comprising a summation of a plurality of subcarriers having distinct frequency components;

wherein a minority of the pulses in each cycle of the power optimized waveform provide a voltage greater than a threshold voltage of each of the plurality of diodes.

14. A method of powering wirelessly powered devices comprising:

providing a wireless power transmission system; and

providing a power waveform comprising a summation of a plurality of subcarriers having distinct frequency components to a wirelessly powered device from the wireless power transmission system;

wherein each cycle of the power waveform includes a charge portion and a starve portion, and wherein the maximum current of the charge portion is at least double the Root Mean Square (“

RMS”

) current of the starve portion.