External or internal wireless power receiver with spaced-apart antenna elements for charging or powering mobile devices using wirelessly delivered power

• US 10,075,017 B2
• Filed: 12/29/2014
• Issued: 09/11/2018
• Est. Priority Date: 02/06/2014
• Status: Active Grant

• Current Assignee: Energous Corporation
• Original Assignee: Energous Corporation
• Inventors: Leabman, Michael A., Brewer, Gregory Scott
• Primary Examiner(s): Cole, Brandon S
• Application Number:
  US14/584,415
• Publication Number:
  US 20160099614A1
• Time in Patent Office: 1,352 Days
• Field of Search: 320107-115, 307104
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03

Abstract

The embodiments described herein include a transmitter that transmits a power transmission signal (e.g., radio frequency (RF) signal waves) to create a three-dimensional pocket of energy. At least one receiver can be connected to or integrated into electronic devices and receive power from the pocket of energy. The transmitter can locate the at least one receiver in a three-dimensional space using a communication medium (e.g., Bluetooth technology). The transmitter generates a waveform to create a pocket of energy around each of the at least one receiver. The transmitter uses an algorithm to direct, focus, and control the waveform in three dimensions. The receiver can convert the transmission signals (e.g., RF signals) into electricity for powering an electronic device. Accordingly, the embodiments for wireless power transmission can allow powering and charging a plurality of electrical devices without wires.

Claims

1. A method for wireless power transmission to a mobile device, comprising:

receiving, by a plurality of separate antenna elements of a wireless power receiver, radio frequency (RF) power transmission waves that are transmitted by a wireless power transmitter to converge to form constructive interference patterns in a three dimensional space as a pocket of energy at a predetermined location, wherein the wireless power receiver is coupled with a mobile device; and

converting, by the wireless power receiver, energy from the pocket of energy at the predetermined location to direct current electricity that is used to charge the mobile device,

wherein each of the plurality of separate antenna elements is spaced apart from each other and is on a flexible printed circuit film that is attached to the mobile device or a housing coupled to the mobile device.

2. The method of claim 1, wherein the wireless power receiver is embedded around an internal edge of the mobile device.

3. The method of claim 1, wherein the plurality of separate antenna elements are distributed on a grid around an internal edge of the mobile device.

4. The method of claim 1, wherein the wireless power receiver is embedded around an internal edge of the mobile device, and an array of the plurality of separate antenna elements are distributed on a grid on an outwardly facing surface of the receiver.

5. The method of claim 1, wherein an output of the wireless power receiver is connected to a battery for the mobile device.

6. The method of claim 1, wherein the wireless power receiver is formed on the flexible printed circuit film and the wireless power receiver comprises:

the plurality of separate antenna elements that are printed antenna elements connected in serial, parallel, or combination thereof;

a rectifier; and

a power converter, wherein the flexible printed circuit film is affixed to an internal edge of the mobile device.

7. The method of claim 1, wherein the spacing between the separate antenna elements is approximately 5 mm to 12 mm for receiving the pockets of energy.

8. The method of claim 1, wherein the plurality of separate antenna elements are made from conductive materials of copper, silver, or gold, and the plurality of separate antenna elements are etched or laminated onto a non-conductive flexible substrate band included in the flexible printed circuit film.

9. The method of claim 1, wherein the wireless power receiver is mounted on a peripheral edge cover for the mobile device, the cover having a predetermined thickness and circumference conforming to generally an outer edge of the mobile device with an array of the plurality of separate antenna elements spaced apart from each other on an inner surface of the cover.

10. The method of claim 9, wherein the cover with the wireless power receiver is a laptop cover, camera cover, GPS cover, a tablet cover, or an iPod cover.

11. The method of claim 1, wherein the wireless power transmitter:

receives a selection to send pockets of energy to the wireless power receiver when the mobile device comes within a predetermined range of the wireless power transmitter;

verifies a battery charge level of the mobile device; and

transmits power transmission waves based upon the battery charge level.

12. The method of claim 1, wherein the wireless power transmitter adjusts the pocket of energy to regulate power to the wireless power receiver within predetermined range of the wireless power transmitter.

13. A receiver for wireless power transmission to a mobile device, comprising:

a flexible printed circuit film mounted on the mobile device or attached to a housing coupled to the mobile device;

an array of separate antenna elements spaced apart from each other on the flexible printed circuit film and configured for reception of radio frequency (RF) power transmission waves that converge to form constructive interference patterns as a pocket of energy generated by a transmitter; and

a rectifier connected to a power convertor configured for converting energy from the pocket of energy into a charging or powering voltage for the mobile device, wherein the rectifier and the power convertor are on the flexible printed circuit film.

14. The receiver of claim 13, wherein the flexible printed circuit film is a flexible printed circuit board connected to the separate antenna elements, rectifier, and power converter.

15. The receiver of claim 13, wherein the separate antenna elements are printed antenna elements on the flexible printed circuit film and configured for collecting the RF power transmission waves for charging the mobile device.

16. The receiver of claim 13, wherein the power converter is a DC-DC converter configured to provide a constant voltage output to the mobile device.

17. The receiver of claim 13, wherein the flexible printed circuit film:

comprises a flexible cable configured for connection to a battery in the mobile device and

is part of a cover for a smartphone, iPad, iPod, tablet, a laptop computer, a camera, or a GPS unit.

18. The receiver of claim 13, wherein the separate antenna elements face out from an inner surface of the housing when the separate antenna elements are part of a cover for the mobile device and the separate antenna elements face out from the outer surface of the housing when embedded around an internal edge of the mobile device for reception of the power transmission waves.