SYSTEMS AND METHODS FOR PROVIDING A POWER OPTIMIZED WAVEFORM

• US 20110148221A1
• Filed: 08/17/2009
• Published: 06/23/2011
• 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
• Granted Patent: US 8,987,940 B2
• Time in Patent Office: 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;

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; and

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

RMS”

) voltage of the starve portion.

2. The method of powering wirelessly powered devices 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 powering wirelessly powered devices of claim 1, wherein the maximum voltage of the charge portion more than four times the RMS voltage of the starve portion.

4. The method of powering wirelessly powered devices 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;

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

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

RMS”

) voltage of the starve portion.

6. The method of providing a power optimized waveform 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 providing a power optimized waveform of claim 5, wherein maximum voltage of the charge portion more than four times the RMS voltage of the starve portion

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

9. The method of providing a power optimized waveform of claim 5, wherein a 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 the wireless sly powered device.

10. A wirelessly powered device:

a charge pump including a voltage doubler;

the charge pump configured to receive a power optimized waveform; 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.

14. The wireless power transmission system of claim 11, wherein the amplifier is a class A amplifier.

15. The wireless power transmission system of claim 11, wherein amplifier is configured along with local oscillator to up-convert the power optimized waveform signal to a desired center frequency.

13. A wireless power transmission system:

a mixer configured to mix a data signal with a power optimized waveform baseband signal; and

an amplifier configured to receive the power optimized waveform signal output from the mixer as a bias power input and to receive an input signal from a local oscillator; and

an antenna configured to distribute the amplified power optimized waveform signal.

16. A wireless power transmission system:

a first mixer configured to mix a data signal with a power optimized waveform baseband signal;

a second mixer connected to a power optimized waveform signal output from the first mixer and a local oscillator;

a power splitter configured to split the power optimized waveform signal into a plurality of lower powered signals;

a plurality of amplifiers configured to amply the plurality of lower powered signals; and

a power combiner configured to aggregate the plurality of amplified lower powered signals into an amplified power optimized waveform signal; and

an antenna to distribute the amplified power optimized waveform signal.

17. A wirelessly powered device:

a charge pump including a plurality of diodes;

the charge pump configured to receive a power optimized waveform; and

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.

18. A method of powering wirelessly powered devices comprising:

providing a wireless power transmission system;

providing a power waveform 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.