US 9,812,890 B1
Portable wireless charging pad
Michael A. Leabman, San Ramon, CA (US); and Gregory Scott Brewer, Livermore, CA (US)
Assigned to Energous Corporation, San Jose, CA (US)
Filed by ENERGOUS CORPORATION, San Jose, CA (US)
Filed on Dec. 30, 2014, as Appl. No. 14/585,341.
Application 14/585,341 is a continuation in part of application No. 13/939,706, filed on Jul. 11, 2013, granted, now 9,143,000.
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 7/00 (2006.01); H02J 7/02 (2016.01)
CPC H02J 7/025 (2013.01) 17 Claims
OG exemplary drawing
 
1. A method for wireless charging, the method comprising:
receiving, by at least one receiver antenna of a near-field cordless charging pad, energy from a first pocket of energy formed from constructive interference of a first plurality of power waves emitted from a first plurality of transmitter antennas of a far-field wireless power transmitter that is distinct from the near-field cordless charging pad;
charging, using the energy received by the at least one receiver antenna from the first pocket of energy, a first battery of the near-field cordless charging pad; and
transmitting, by a second plurality of transmitter antennas of the near-field cordless charging pad that is powered by the first battery, a second plurality of power waves to constructively interfere to form a second pocket of energy at a receiver, wherein the receiver is configured to convert energy of the second pocket of energy to charge a second battery of an electronic device that is coupled with the receiver, wherein the near-field cordless charging pad is in proximity of the electronic device.