US 12,034,310 B2
Ultra-low power beamforming wireless power transfer system
Aatmesh Shrivastava, Boston, MA (US)
Assigned to Northeastern University, Boston, MA (US)
Filed by Northeastern University, Boston, MA (US)
Filed on Jul. 11, 2022, as Appl. No. 17/861,603.
Claims priority of provisional application 63/221,694, filed on Jul. 14, 2021.
Prior Publication US 2023/0026315 A1, Jan. 26, 2023
Int. Cl. H02J 50/20 (2016.01); H01Q 3/22 (2006.01); H02J 50/40 (2016.01); H02J 50/80 (2016.01)
CPC H02J 50/20 (2016.02) [H01Q 3/22 (2013.01); H02J 50/40 (2016.02); H02J 50/80 (2016.02)] 11 Claims
OG exemplary drawing
 
1. A wireless power transfer (WPT) system for combining and transferring the radio frequency (RF) energy output of a network of RF energy transmitters to a remotely located energy receiver, the system comprising:
an ultra-low power (ULP) closed loop beamforming energy transfer system, the energy transfer system comprising:
an open-circuit rectifier configured to produce an open circuit voltage to sense received power from each of the RF energy transmitters, and
circuitry electrically coupled to the open-circuit rectifier configured to provide information to correct the phase and frequency offset among the RF energy transmitters based on the sensed received power; wherein the circuitry includes an analog-to-digital converter (ADC) electrically coupled to a pulse generator, a bandgap reference (BGR) circuit, and a crystal oscillator (XO), wherein the open circuit voltage, an output of the BGR, and an output of the XO are input to the ADC to produce an indication of the received power to be input to the pulse generator to generate pulses to transmit the information.